eRAN
MIMO Feature Parameter Description Issue
01
Date
2019-06-06
HUAWEI TECHNOLOGIES CO., LTD.
Copyright © Huawei Technologies Co., Ltd. 2019. All rights reserved. No part of this document may be reproduced or transmitted in any form or by any means without prior written consent of Huawei Technologies Co., Ltd.
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Contents 1 Change History.............. History..................................... ............................................. ............................................ ............................................ ............................................ ........................ 1 1.1 eRAN15.1 01 eRAN15.1 01 (2019-06-06).................................................................................... ( 2019-06-06)............................................................................................................................................1 ........................................................1 1.2 eRAN15.1 Draft eRAN15.1 Draft C (2019-04-10)....................................................................................................................................1 (2019-04-10)....................................................................................................................................1 1.3 eRAN15.1 Draft eRAN15.1 Draft B (2019-03-18)....................................................................................................................................2 (2019-03-18)....................................................................................................................................2 1.4 eRAN15.1 Draft eRAN15.1 Draft A (2019-01-05)................................................................................................ (2019-01-05)................................................................................................................................... ................................... 2
2 About This This Document........... Document................................. ............................................ ............................................. ............................................. .................................... .............. 4 2.1 General Statements.......................................................................... Statements......................................................................................................................................................... ...............................................................................4 4 2.2 Applicable Applicable RA RAT................................................................................................ T.............................................................................................................................................................. .............................................................. 4 2.3 Features in in This Document.............................................................................................................................................4 2.4 Feature Differences Differences Between NB-IoT and FDD.................................................................................................... FDD............................................................................................................ ........ 5
3 Overview........... Overview................................. ............................................ ............................................ ............................................. ............................................. ..................................... ............... 7 3.1 Definition........................................................................................................................................................................7 Definition........................................................................................................................................................................7 3.2 Benefits........................................................................................................................................................................... Benefits...........................................................................................................................................................................7 7
4 General Principles.......... Principles................................. ............................................. ............................................ ............................................ .......................................... ....................11 11 4.1 Multiple-Antenna Multiple-Antenna Transmission................................................................................................................ Transmission................................................................................................................................... ................... 11 4.1.1 Basic Concepts...........................................................................................................................................................11 Concepts...........................................................................................................................................................11 4.1.2 Downlink Transmission Processing...........................................................................................................................12 4.1.3 Transmission Modes and Solutions........................................................................................................................... Solutions........................................................................................................................... 14 4.2 Multiple-Antenna Multiple-Antenna Reception..................................................... Reception........................................................................................................................................ ................................................................................... 17 4.2.1 Receive Diversity.................................................................................................... Diversity...................................................................................................................................................... .................................................. 17 4.2.2 Uplink MU-MIMO............................................................................................................ MU-MIMO.................................................................................................................................................... ........................................ 18 4.2.3 Uplink SU-MIMO........................................................................................................ SU-MIMO..................................................................................................................................................... ............................................. 19
5 Downlink Downlink MIMO.......... MIMO................................ ............................................ ............................................. ............................................. ........................................... ..................... 20 5.1 Transmission Transmission Mode Configuration............................................................................................................................... Configuration...............................................................................................................................20 20 5.2 CRS Port Mapping (FDD)............................................................................................................................................21 5.3 CRS Port Mapping Detection and Reconfiguration (FDD)..........................................................................................25 5.3.1 Principles...................................................................................................... Principles................................................................................................................................................................... ............................................................. 25 5.3.1.1 Detection Detection and Reconfiguration...............................................................................................................................25 5.3.1.2 Example.................................................................................................................................................................. Example..................................................................................................................................................................26 26 5.3.2 Network Analysis......................................................................................................... Analysis...................................................................................................................................................... ............................................. 27 5.3.2.1 Benefits................................................................................................................................................................... Benefits...................................................................................................................................................................27 27 5.3.2.2 Impacts................................................................................................ Impacts....................................................................................................................................................................28 ....................................................................28 Issue 01 (2019-06-06)
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5.3.3 Requirements............................................................................................................................................................. 30 Requirements.............................................................................................................................................................30 5.3.3.1 Licenses..................................................................................................................... Licenses.................................................................................................................................................................. ............................................. 30 5.3.3.2 Software.................................................................................................................................................................. Software..................................................................................................................................................................30 30 5.3.3.3 Hardware............................................................................ Hardware................................................................................................................................................................ .................................................................................... 31 5.3.3.4 Others.................................................................................................. Others......................................................................................................................................................................32 ....................................................................32 5.3.4 Operation Operation and Maintenance.......................................................................................................................................32 5.3.4.1 Data Configuration.................................................................................. Configuration................................................................................................................................................. ............................................................... 32 5.3.4.1.1 Data Prepara Data Preparation................................................................................................... tion.................................................................................................................................................. ............................................... 32 5.3.4.1.2 Using Using MML Commands......................................................................................................................................32 5.3.4.2 Verification Verification and Monitoring.................................................................................................... Monitoring................................................................................................................................... ............................... 33 5.4 DL 4-Antenna 4-Antenna Transmit Diversity Diversity (FDD).................................................................................................................... (FDD).................................................................................................................... 34 5.4.1 Principles....................................................................................................... Principles................................................................................................................................................................... ............................................................ 34 5.4.2 Network Analysis......................................................................................................... Analysis...................................................................................................................................................... ............................................. 35 5.4.2.1 Benefits...................................................................................................................................................................35 Benefits...................................................................................................................................................................35 5.4.2.2 Impacts....................................................................................................................................................................36 Impacts....................................................................................................................................................................36 5.4.3 Requirements.................................................................................................. Requirements............................................................................................................................................................. ........................................................... 36 5.4.3.1 Licenses.................................................................................................... Licenses.................................................................................................................................................................. .............................................................. 36 5.4.3.2 Software..................................................................................................................................................................36 Software..................................................................................................................................................................36 5.4.3.3 Hardware............................................................................................. Hardware................................................................................................................................................................ ................................................................... 36 5.4.3.4 Networking................................................................................................. Networking............................................................................................................................................................. ............................................................ 37 5.4.3.5 Others......................................................................................................................................................................37 Others......................................................................................................................................................................37 5.4.4 Operation Operation and Maintenance.......................................................................................................................................37 5.4.4.1 Data Configuration.................................................................................. Configuration................................................................................................................................................. ............................................................... 37 5.4.4.1.1 Data Prepara Data Preparation................................................................................................... tion.................................................................................................................................................. ............................................... 37 5.4.4.1.2 Using Using MML Commands......................................................................................................................................37 5.4.4.1.3 Using Using the CME.................................................................................................................................................... CME.................................................................................................................................................... 37 5.4.4.2 Verification Verification and Monitoring.................................................................................................... Monitoring................................................................................................................................... ............................... 37 5.4.4.2.1 Activation Activation Verification..................................................................................... Verification........................................................................................................................................ ................................................... 37 5.4.4.2.2 Network Network Monitoring............................................................................................................................................ Monitoring............................................................................................................................................38 38 5.5 DL 2x2 MIMO..............................................................................................................................................................38 M IMO..............................................................................................................................................................38 5.5.1 Principles....................................................................................................... Principles................................................................................................................................................................... ............................................................ 38 5.5.2 Network Analysis......................................................................................................... Analysis...................................................................................................................................................... ............................................. 39 5.5.2.1 Benefits...................................................................................................................................................................39 Benefits...................................................................................................................................................................39 5.5.2.2 Impacts....................................................................................................................................................................39 Impacts....................................................................................................................................................................39 5.5.3 Requirements.................................................................................................. Requirements............................................................................................................................................................. ........................................................... 39 5.5.3.1 Licenses.................................................................................................... Licenses.................................................................................................................................................................. .............................................................. 40 5.5.3.2 Software..................................................................................................................................................................40 Software..................................................................................................................................................................40 5.5.3.3 Hardware............................................................................................. Hardware................................................................................................................................................................ ................................................................... 40 5.5.3.4 Others......................................................................................................................................................................40 Others......................................................................................................................................................................40 5.5.4 Operation Operation and Maintenance.......................................................................................................................................40 5.5.4.1 Data Configuration.................................................................................. Configuration................................................................................................................................................. ............................................................... 40 5.5.4.1.1 Data Prepara Data Preparation................................................................................................... tion.................................................................................................................................................. ............................................... 41
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5.5.4.1.2 Using MML Commands (FDD)................................................................................................................ .......... 41 (FDD).......................................................................................................................... 5.5.4.1.3 Using the CME.................................................................................................................................................... CME.................................................................................................................................................... 42 5.5.4.2 Verification Verification and Monitoring................................................................................................................................... Monitoring................................................................................................................................... 42 5.6 DL 4x2 MIMO (FDD)..................................................................................................................................................42 5.6.1 Principles....................................................................................................................... Principles................................................................................................................................................................... ............................................ 42 5.6.2 Network Analysis......................................................................................................... Analysis...................................................................................................................................................... ............................................. 43 5.6.2.1 Benefits...................................................................................................................................................................43 Benefits...................................................................................................................................................................43 5.6.2.2 Impacts....................................................................................................................................................................44 Impacts....................................................................................................................................................................44 5.6.3 Requirements............................................................................................................................................................. Requirements.............................................................................................................................................................44 44 5.6.3.1 Licenses..................................................................................................................... Licenses.................................................................................................................................................................. ............................................. 44 5.6.3.2 Software.................................................................................................................................................................. Software..................................................................................................................................................................44 44 5.6.3.3 Networking.................................................................................................................................................... Networking............................................................................................................................................................. ......... 44 5.6.3.4 Hardware............................................................................ Hardware................................................................................................................................................................ .................................................................................... 45 5.6.3.5 Others.................................................................................................. Others......................................................................................................................................................................45 ....................................................................45 5.6.4 Operation and Maintenance....................................................................................................................................... Maintenance.......................................................................................................................................46 46 5.6.4.1 Data Configuration.................................................................................................................... Configuration................................................................................................................................................. ............................. 46 5.6.4.1.1 Data Preparation.................................................................................................................... Preparation.................................................................................................................................................. .............................. 46 5.6.4.1.2 Using MML Commands......................................................................................................................................47 5.6.4.1.3 Using the CME.................................................................................................................................................... CME.................................................................................................................................................... 48 5.6.4.2 Verification Verification and Monitoring................................................................................................................................... Monitoring................................................................................................................................... 48 5.7 DL 4x4 MIMO..............................................................................................................................................................49 MIMO..............................................................................................................................................................49 5.7.1 Principles....................................................................................................................... Principles................................................................................................................................................................... ............................................ 49 5.7.2 Network Analysis......................................................................................................... Analysis...................................................................................................................................................... ............................................. 50 5.7.2.1 Benefits................................................................................................................................................................... Benefits...................................................................................................................................................................50 50 5.7.2.2 Impacts................................................................................................ Impacts....................................................................................................................................................................51 ....................................................................51 5.7.3 Requirements............................................................................................................................................................. Requirements.............................................................................................................................................................51 51 5.7.3.1 Licenses..................................................................................................................... Licenses.................................................................................................................................................................. ............................................. 51 5.7.3.2 Software.................................................................................................................................................................. Software..................................................................................................................................................................52 52 5.7.3.3 Hardware............................................................................ Hardware................................................................................................................................................................ .................................................................................... 52 5.7.3.4 Networking Networking (FDD).................................................................................................................................. (FDD)................................................................................................................................................. ............... 52 5.7.3.5 Others.................................................................................................. Others......................................................................................................................................................................54 ....................................................................54 5.7.4 Operation and Maintenance....................................................................................................................................... Maintenance.......................................................................................................................................55 55 5.7.4.1 Data Configuration.................................................................................................................... Configuration................................................................................................................................................. ............................. 55 5.7.4.1.1 Data Preparation.................................................................................................................... Preparation.................................................................................................................................................. .............................. 55 5.7.4.1.2 Using MML Commands (FDD)................................................................................................................ (FDD).......................................................................................................................... .......... 56 5.7.4.1.3 Using the CME.................................................................................................................................................... CME.................................................................................................................................................... 57 5.7.4.2 Verification Verification and Monitoring................................................................................................................................... Monitoring................................................................................................................................... 57 5.8 TX Channel Calibration................................................................................................................................................58 Calibration................................................................................................................................................58 5.9 Downlink-Only Module Channel Channel Calibration (FDD).................................................................................................. (FDD).................................................................................................. 60
6 Uplink MIMO......... MIMO............................... ............................................ ............................................ ............................................ ............................................. ............................. ...... 61 6.1 UL 2-Antenna 2-Antenna Receive Diversity................................................................................................. Diversity................................................................................................................................. ................................ 61 6.1.1 Principles....................................................................................................... Principles................................................................................................................................................................... ............................................................ 61 Issue 01 (2019-06-06)
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6.1.1.1 1T2R Cell.............................................................................. Cell............................................................................................................................................................... ................................................................................. 62 6.1.1.2 2T2R Cell.............................................................................. Cell............................................................................................................................................................... ................................................................................. 63 6.1.2 Network Analysis......................................................................................................... Analysis...................................................................................................................................................... ............................................. 64 6.1.2.1 Benefits................................................................................................................................................................... Benefits...................................................................................................................................................................64 64 6.1.2.2 Impacts................................................................................................ Impacts....................................................................................................................................................................64 ....................................................................64 6.1.3 Requirements.................................................................................................. Requirements............................................................................................................................................................. ........................................................... 64 6.1.3.1 Licenses.................................................................................................... Licenses.................................................................................................................................................................. .............................................................. 64 6.1.3.2 Software..................................................................................................................................................................65 Software..................................................................................................................................................................65 6.1.3.3 Hardware............................................................................................. Hardware................................................................................................................................................................ ................................................................... 65 6.1.3.4 Others......................................................................................................................................................................65 Others......................................................................................................................................................................65 6.1.4 Operation Operation and Maintenance.......................................................................................................................................65 6.1.4.1 Data Configuration.................................................................................. Configuration................................................................................................................................................. ............................................................... 65 6.1.4.1.1 Data Prepara Data Preparation................................................................................................... tion.................................................................................................................................................. ............................................... 65 6.1.4.1.2 Using Using MML Commands (FDD)............................................................................................... (FDD).......................................................................................................................... ........................... 66 6.1.4.1.3 Using Using the CME.................................................................................................................................................... CME.................................................................................................................................................... 66 6.1.4.2 Verification Verification and Monitoring.................................................................................................... Monitoring................................................................................................................................... ............................... 66 6.2 UL 4-Antenna 4-Antenna Receive Diversity................................................................................................. Diversity................................................................................................................................. ................................ 68 6.2.1 Principles....................................................................................................... Principles................................................................................................................................................................... ............................................................ 68 6.2.1.1 2T4R Cell (FDD).................................................................................................................................................... (FDD)....................................................................................................................................................68 68 6.2.1.2 4T4R Cell.............................................................................. Cell............................................................................................................................................................... ................................................................................. 70 6.2.2 Network Analysis......................................................................................................... Analysis...................................................................................................................................................... ............................................. 72 6.2.2.1 Benefits...................................................................................................................................................................72 Benefits...................................................................................................................................................................72 6.2.2.2 Impacts....................................................................................................................................................................73 Impacts....................................................................................................................................................................73 6.2.3 Requirements.................................................................................................. Requirements............................................................................................................................................................. ........................................................... 73 6.2.3.1 Licenses.................................................................................................... Licenses.................................................................................................................................................................. .............................................................. 73 6.2.3.2 Software..................................................................................................................................................................74 Software..................................................................................................................................................................74 6.2.3.3 Hardware............................................................................................. Hardware................................................................................................................................................................ ................................................................... 74 6.2.3.4 Others......................................................................................................................................................................75 Others......................................................................................................................................................................75 6.2.4 Operation Operation and Maintenance.......................................................................................................................................75 6.2.4.1 Data Configuration.................................................................................. Configuration................................................................................................................................................. ............................................................... 75 6.2.4.1.1 Data Prepara Data Preparation................................................................................................... tion.................................................................................................................................................. ............................................... 75 6.2.4.1.2 Using Using MML Commands (FDD)............................................................................................... (FDD).......................................................................................................................... ........................... 76 6.2.4.1.3 Using Using MML Commands (NB-IoT)..................................................................................................... (NB-IoT)......................................................................................................................77 .................77 6.2.4.1.4 Using Using the CME.................................................................................................................................................... CME.................................................................................................................................................... 80 6.2.4.2 Verification Verification and Monitoring.................................................................................................... Monitoring................................................................................................................................... ............................... 80 6.3 UL 2x2 MU-MIMO M U-MIMO (FDD)................................................................................................................................. (FDD).......................................................................................................................................... ......... 82 6.3.1 Principles....................................................................................................... Principles................................................................................................................................................................... ............................................................ 82 6.3.2 Network Analysis......................................................................................................... Analysis...................................................................................................................................................... ............................................. 82 6.3.2.1 Benefits...................................................................................................................................................................83 Benefits...................................................................................................................................................................83 6.3.2.2 Impacts....................................................................................................................................................................83 Impacts....................................................................................................................................................................83 6.3.3 Requirements.................................................................................................. Requirements............................................................................................................................................................. ........................................................... 84 6.3.3.1 Licenses.................................................................................................... Licenses.................................................................................................................................................................. .............................................................. 84
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6.3.3.2 Software.................................................................................................................................................................. 85 Software..................................................................................................................................................................85 6.3.3.3 Hardware............................................................................ Hardware................................................................................................................................................................ .................................................................................... 85 6.3.3.4 Others.................................................................................................. Others......................................................................................................................................................................85 ....................................................................85 6.3.4 Operation and Maintenance....................................................................................................................................... Maintenance.......................................................................................................................................85 85 6.3.4.1 Data Configuration.................................................................................................................... Configuration................................................................................................................................................. ............................. 86 6.3.4.1.1 Data Prepara Data Preparation................................................................................................... tion.................................................................................................................................................. ............................................... 86 6.3.4.1.2 Using Using MML Commands......................................................................................................................................86 6.3.4.1.3 Using Using the CME.................................................................................................................................................... CME.................................................................................................................................................... 86 6.3.4.2 Verification Verification and Monitoring.................................................................................................... Monitoring................................................................................................................................... ............................... 86 6.4 UL 2x4 MU-MIMO......................................................................................................................................................87 M U-MIMO......................................................................................................................................................87 6.4.1 Principles....................................................................................................... Principles................................................................................................................................................................... ............................................................ 87 6.4.2 Network Analysis......................................................................................................... Analysis...................................................................................................................................................... ............................................. 88 6.4.2.1 Benefits...................................................................................................................................................................88 Benefits...................................................................................................................................................................88 6.4.2.2 Impacts....................................................................................................................................................................88 Impacts....................................................................................................................................................................88 6.4.3 Requirements.................................................................................................. Requirements............................................................................................................................................................. ........................................................... 90 6.4.3.1 Licenses.................................................................................................... Licenses.................................................................................................................................................................. .............................................................. 90 6.4.3.2 Software..................................................................................................................................................................90 Software..................................................................................................................................................................90 6.4.3.3 Hardware............................................................................................. Hardware................................................................................................................................................................ ................................................................... 91 6.4.3.4 Others......................................................................................................................................................................91 Others......................................................................................................................................................................91 6.4.4 Operation Operation and Maintenance.......................................................................................................................................91 6.4.4.1 Data Configuration Configuration (FDD)................................................................................................... (FDD)......................................................................................................................................91 ...................................91 6.4.4.1.1 Data Prepara Data Preparation................................................................................................... tion.................................................................................................................................................. ............................................... 91 6.4.4.1.2 Using Using MML Commands......................................................................................................................................92 6.4.4.1.3 Using Using the CME.................................................................................................................................................... CME.................................................................................................................................................... 92 6.4.4.2 Verification Verification and Monitoring.................................................................................................... Monitoring................................................................................................................................... ............................... 92 6.5 UL SU-MIMO.................................................................................................... SU-MIMO.............................................................................................................................................................. .......................................................... 93 6.5.1 Principles....................................................................................................... Principles................................................................................................................................................................... ............................................................ 93 6.5.1.1 Uplink Transmission Transmission Modes...................................................................................................................................93 6.5.1.2 Rank Selection........................................................................................................................................................94 6.5.2 Network Analysis......................................................................................................... Analysis...................................................................................................................................................... ............................................. 94 6.5.2.1 Benefits...................................................................................................................................................................94 Benefits...................................................................................................................................................................94 6.5.2.2 Impacts....................................................................................................................................................................95 Impacts....................................................................................................................................................................95 6.5.3 Requirements.................................................................................................. Requirements............................................................................................................................................................. ........................................................... 96 6.5.3.1 Licenses.................................................................................................... Licenses.................................................................................................................................................................. .............................................................. 96 6.5.3.2 Software..................................................................................................................................................................96 Software..................................................................................................................................................................96 6.5.3.3 Hardware............................................................................................. Hardware................................................................................................................................................................ ................................................................... 97 6.5.3.4 Others......................................................................................................................................................................97 Others......................................................................................................................................................................97 6.5.4 Operation Operation and Maintenance.......................................................................................................................................97 6.5.4.1 Data Configuration Configuration (FDD)................................................................................................... (FDD)......................................................................................................................................98 ...................................98 6.5.4.1.1 Data Prepara Data Preparation................................................................................................... tion.................................................................................................................................................. ............................................... 98 6.5.4.1.2 Using Using MML Commands......................................................................................................................................99 6.5.4.1.3 Using Using the CME.................................................................................................................................................... CME.................................................................................................................................................... 99
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6.5.4.2 Verification Monitoring................................................................................................................................... 99 Verification and Monitoring...................................................................................................................................
7 Parameters..... Parameters............................ ............................................. ............................................ ............................................ ............................................ ..................................... ...............102 102 8 Counters.......... Counters................................ ............................................ ............................................ ............................................ ............................................ .................................... .............. 103 9 Glossary......... Glossary................................ ............................................. ............................................ ............................................ ............................................ ..................................... ...............104 104 10 Reference Documents.......... Documents................................ ............................................. ............................................. ............................................ ................................ .......... 105
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1 Change History
1
Change History
This chapter describes describes changes not not included included in the "Par ameters", ameters", "Counters", "Glossary", and "Reference Documents" chapters. These changes include: l
Technical changes Changes in functions and their corresponding parameters
l
Editorial changes Improvements or revisions to the documentation
1.1 eRAN15.1 01 (2019-06-06) This issue includes the following changes.
Technical Changes Change Description
Parameter Change
RAT
Base Station Model
None
None
FDD
None
Editorial Changes Revised descriptions in this document, and added 4 General Principles. Added the impact relationship and mutually exclusive relationship between the "CRS port mapping detection and reconfiguration (FDD)" function and energy conservation. For details, see 5.3.2.2 Impacts and 5.3.3.2 Software.
1.2 eRAN15.1 Draft C (2019-04-10) This issue includes the following changes.
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1 Change History
Technical Changes Change Description
Parameter Change
RAT
Base Station Model
Added downlink-only module channel calibration. For details, Downlink-Only ly see 5.9 Downlink-On Module Channel Calibration (FDD).
None
FDD
3900 and 5900 series base stations
Editorial Changes Revised descriptions in this document.
1.3 eRAN15.1 Draft B (2019-03-18) This issue includes includes the following following changes.
Technical Changes Change Description
Parameter Change
RAT
Base Station Model
Added the CRS portchannel mapping adjustment function. For details, see CRS PortChannel Mapping Adjustment .
Add the LogicalPort PDSCHCfg. LogicalPort SwapSwitch parameter.
FDD
3900 and 5900 series base stations
Enabled the UBBPg to support uplink 4-antenna receive diversity. For details, see 6.2.3.3 Hardware.
None
FDD
3900 and 5900 series base stations
Editorial Changes Revised descriptions in this document.
1.4 eRAN15.1 Draft A (2019-01-05) This issue intr oduces oduces the following changes following changes to eRAN13.1 01 (2018-04-10).
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1 Change History
Technical Changes Change Description
Parameter Change
RAT
Base Station Model
Deleted the method of detecting no-spacing antenna combinations from 5.3.1.1 Detection and Reconfigurat Reconfiguration ion.
Deleted the ColumnDetectMethod parameter from the STR CRSPORTOPTDET command
FDD
3900 and 5900 series base stations
Added counters for uplink MU-MIMO performance monitoring. monitoring.
None
FDD
3900 and 5900 series base stations
Change Description
Parameter Change
RAT
Base Station Model
Added descriptions about
For details, see
NB-IoT
3900 and 5900
NB-IoT features. For details, see 6.2 UL 4Antenna Receive Diversity and 5.4 DL 4Antenna Transmit Diversity (FDD).
descriptions in the corresponding sections.
Revised descriptions in this document.
None
Editorial Changes
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series base stations
FDD NB-IoT
Copyright © Huawei Technologies Co., Ltd.
3900 and 5900 series base stations
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2 About This Document
2
About This Document
2.1 General Statements Purpose This document is intended to acquaint readers with: l
The technical principles of features and their related parameters
l
The scenarios where these features are used, the benefits they provide, and the impact they have on networks and functions
l
Requirements of the operating environment that must be met before feature activation
l
Parameter configuration required for feature activation, verification of feature activation, and monitoring of feature performance
This document only provides guidance for feature activation. Feature deployment and feature gains depend on the specifics of the network scenario where the feature is deployed. To achieve the desired gains, contact Huawei professional service engineers.
Software Interfaces Any parameters, alarms, counters, or managed objects (MOs) described in this document apply only to the corresponding software release. For future software releases, refer to the corresponding updated product documentation.
2.2 Applicable RAT This document applies to FDD/NB-IoT. FDD/NB-IoT.
2.3 Features in This Document This document describes the following FDD features: Issue 01 (2019-06-06)
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2 About This Document
Feature ID
Feature Name
Section
LOFD-001001
DL 2x2 MIMO
5.5 DL 2x2 MIMO
LOFD-001003
DL 4x2 MIMO
5.6 DL 4x2 MIMO (FDD)
LOFD-001060
DL 4x4 MIMO
5.7 DL 4x4 MIMO
LBFD-00202001
UL 2-Antenna Receive Diversity
6.1 UL 2-Antenna Receive Diversity
LOFD-001005
UL 4-Antenna Receive Diversity
6.2 UL 4-Antenna Receive Diversity
LOFD-001002
UL 2x2 MU-MIMO
6.3 UL 2x2 MU-MIMO (FDD)
LOFD-001058
UL 2x4 MU-MIMO
6.4 UL 2x4 MU-MIMO
LOFD-130201
UL SU-MIMO
6.5 UL SU-MIMO
This document describes the following NB-IoT features.
Feature ID
Feature Name
Section
MLBFD-12000238
UL 2-Antenna Receive Diversity
6.1 UL 2-Antenna Receive Diversity
MLBFD-12100240
DL 4-Antenna Transmit Diversity
5.4 DL 4-Antenna Transmit Diversity (FDD)
MLOFD-121202
UL 4-Antenna Receive Diversity
6.2 UL 4-Antenna Receive Diversity
2.4 Feature Differences Between NB-IoT and FDD FDD
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NB-IoT Feature
FDD Feature
Difference
MLBFD-1200 0238 UL 2Antenna Receive Diversity
LBFD-00202 001 UL 2Antenna Receive Diversity
None
Section
Copyright © Huawei Technologies Co., Ltd.
6.1 UL 2-Antenna Receive Diversity
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2 About This Document
NB-IoT Feature
FDD Feature
Difference
Section
MLBFD-1210 0240 DL 4Antenna Transmit
LOFD-00106 0 DL 4x4 MIMO
NB-IoT:: NB-IoT
For details about NB-IoT,, see 5.4 DL NB-IoT 4-Antenna Transmit
Diversity
MIMO is not supported by 1T1R UEs. A maximum of two NRS antenna ports can be used. SFBC is supported. FDD: MIMO is supported. A maximum of four CRS antenna ports can be used. SFBC+FSTD is supported.
LOFD-00100 3 DL 4x2 MIMO
Diversity (FDD). For details about FDD, see 5.6 DL 4x2 MIMO (FDD) and 5.7 DL 4x4 MIMO.
NB-IoT:: NB-IoT MIMO is not supported by 1T1R UEs. A maximum of two NRS antenna ports can be used. SFBC is supported. FDD: MIMO is supported. A maximum of four CRS antenna ports can be used. SFBC+FSTD is supported.
MLOFD-121 202 UL 4Antenna Receive Diversity
LOFD-00100 5 UL 4Antenna Receive Diversity
NB-IoT:: NB-IoT MIMO is not supported by 1T1R UEs. A maximum of two NRS antenna ports can be used. SFBC is supported.
6.2 UL 4-Antenna Receive Diversity
FDD: MIMO is supported. A maximum of four CRS antenna ports can be used. SFBC+FSTD is supported.
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3
Overview
3.1 Definition Multiple-input multiple-output (MIMO) is a technology that uses multiple antennas at the transmitter or receiver in combination with signal processing techniques to multiply spectral efficiency.. It is developed from single-input single-output (SISO). Multiple antenna efficiency configurations are expressed in the form mxn MIMO, where m represents the number of transmit (TX) antennas and n represents the number of receive (RX) antennas. For example, downlink 2x2 MIMO means that the eNodeB uses two antennas for transmission and the UE uses two antennas for reception; downlink 4x4 MIMO means that the eNodeB uses four antennas for transmission and the UE uses four antennas for reception.
In this document, multiple antennas refer to the logical ports of multiple TX or RX antennas, not to multiple physical antennas.
3.2 Benefits MIMO improves the transmission reliability and signal quality of radio links by using signal processing techniques. It not only increases network network capacity and coverage coverage but also provides provides higher data rates and better user experience. MIMO brings array gains, multiplexing gains, diversity gains, and power gains.
Array Gains Array gains are achieved by utilizing the correlation between signals and non-correlation between noises on different different antennas. The The signals are combined combined to increase the average average signal to interference plus noise ratio (SINR) and improve reception quality, as shown in Figure 3-1.
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Figure 3-1 Array gains
Multiplexing Gains Multiplexing gains are provided are provided by by multiple spatial channels. This increases cell throughput by using multiple antennas, without without the need for additional additional bandwidth or transmit power, power, as shown in Figure 3-2.
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Figure 3-2 Multiplexing gains
Diversity Gains Diversity gains are achieved by taking taking advantage advantage of the non-correlation between deep fading on different antennas. The signals are combined to reduce fading and improve reception quality,, as shown in Figure 3-3. quality
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Figure 3-3 Diversity gains
Power Gains Power gains are offered by multiple TX antennas in noise-limited scenarios to increase the SINR at the RX end and improve reception quality.
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4
General Principles
4.1 Multiple-Antenna Multiple-Antenna Transmission Multiple-antenna transmission is a MIMO technique in which multiple antennas are used to transmit signals and certain algorithms are used for signal processing.
4.1.1 Basic Concepts Open-Loop MIMO and Closed-Loop MIMO Downlink MIMO techniques are classified into open-loop MIMO and closed-loop MIMO based on whether UEs UEs are required to report report precoding matrix matrix indications (PMIs) to eNodeBs eNodeBs for downlink data transmission. Open-loop MIMO and closed-loop MIMO are not involved in the uplink. l
Open-loop MIMO does not require UEs to report PMIs.
l
Closed-loop MIMO requires UEs to report PMIs.
Transmit Diversity and Spatial Multiplexing Downlink MIMO techniques are classified into transmit diversity and spatial multiplexing based on the number of independent data streams streams transmitted on the same time-frequency resources. l
Transmit diversity Transmit diversity is a technique in which signals and their copies are transmitted after encoding based on low correlation between spatial channels as well as time selectivity and frequency selectivity. selectivity. Transmit diversity allows for transmission of only one independent data stream at a time.
l
Spatial multiplexing Spatial multiplexing is a technique in which multiple independent data streams are transmitted using the same time-frequency resources. Spatial multiplexing increases system capacity and brings spatial multiplexing gains because it uses more spatial channels transmission. of one or than moresingle-antenna independent data streams at Spatial a time. t ime. multiplexing allows for transmission
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Downlink MIMO techniques of LTE can be further classified into four categories: open-loop transmit diversity, closed-loop transmit diversity, open-loop spatial multiplexing, and closedloop spatial multiplexing.
4.1.2 Downlink Transmission Processing For details about downlink transmission principles, see section 7.1 "UE procedure for receiving the physical downlink shared channel" in 3GPP TS 36.213 V10.6.0.
Downlink Transmission Procedure Figure 4-1 illustrates the downlink transmission procedure in the logical and physical aspects: l
The process up to "CRS port" involves transmission solutions and transmission modes in the logical aspect.
l
The process from "CRS port" onwards involves mapping between cell-specific reference signal (CRS) ports and TX channels.
The number of CRS ports cannot exceed the number of configured TX channels.
Figure 4-1 Downlink transmission procedure
The following explains the concepts introduced in Figure 4-1: l
Codeword Different codewords represent different data streams. LTE supports a maximum of two codewords. When two or more antennas are available at both the TX and RX ends, the number of codewords depends on radio channel conditions and UE categories. Dual-codeword transmission is mainly used in scenarios with high SINRs, low channel correlations, and UE categories of 2 or above.
l
Rank If the codeword rank is 1, the eNodeB typically uses transmit diversity. Alternatively, Alternatively, the eNodeB can use transmission mode 6 (TM6), which is a special form of closed-loop spatial multiplexing in rank 1. If the codeword rank is greater than 1, the eNodeB uses spatial multiplexing.
l
Layer mapping mapping and precoding and precoding Layer mapping and precoding are used to map codewords onto CRS ports.
–
In layer mapping, codewords are mapped onto layers. The number of multiplexing layers (also called MIMO layers) determined the ports, rank. The maximum number of multiplexing layers depends onisthe number ofby CRS as shown in Table 4-1.
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– l
4 General Principles
In precoding, layered data streams are mapped onto CRS ports.
CRS port CRS ports are logical antenna ports. According to protocols, a cell can be configured with one, two, or four CRS ports. The number of CRS ports is specified by the Cell.CrsPortNum parameter. Table 4-1 describes the logical antenna ports used as CRS ports. Table 4-1 4 -1 Logical antenna ports used as CRS ports
Number of CRS Ports
Logical Antenna Ports
Description
1
Port 0
When there is only one CRS port, only single-codeword transmission can be performed, which is not a MIMO transmission solution.
2
Ports 0 and 1
When there are two CRS ports, a maximum of two multiplexing layers can be used.
4
Ports 0, 1, 2, and 3
When thereofarfour e foumultiplexing r CRS ports,layers a maximum can be used.
Example (with Four CRS Ports) Figure 4-2 il illustrates lustrates codeword, codeword, rank, layer mapping, and precoding when there are four CRS ports.
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Figure 4-2 Example of codeword, rank, layer mapping, precoding when there are four CRS ports
4.1.3 Transmission Modes and Solutions Transmission Modes For details about transmission modes defined in 3GPP Release 10, see section 7.1 "UE procedure for receiving receiving the physical downlink downlink shared channel" channel" in 3GPP TS 36.213 V10.6.0. Table 4-2 4 -2 describes the transmission modes supported by eNodeBs. Table 4-2 4 -2 Transmission modes and corresponding MIMO techniques
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Transmission Mode
Protocol-Defined MIMO Protocol-Defined Technique
Meaning
TM1
Single antenna port (port 0)
Single antenna port 0 is used.
TM2
Transmit diversity
Open-loop transmit diversity is used.
TM3
Transmit diversity
If only one data stream is transmitted, open-loop transmit diversity is used.
Large-delay cyclic delay Large-delay diversity (CDD) spatial multiplexing
If multiple data streams are transmitted, large-delay CDD spatial multiplexing is used.
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Transmission Mode
Protocol-Defined MIMO Protocol-Defined Technique
Meaning
TM4
Transmit diversity
When the PMIs reported by UEs are not used for signal processing at the transmitter, open-loop transmit diversity is used. One data stream is transmitted.
TM6
TM9 and TM10
Closed-loop spatial multiplexing
When the PMIs reported by UEs are used for signal processing at the transmitter, closed-loop spatial multiplexing is used. One or more data streams are transmitted.
Transmit diversity
When the PMIs reported by UEs are not used for signal processing at the transmitter, open-loop transmit diversity is used. One data stream is transmitted.
Closed-loop spatial multiplexing for a single
When the PMIs reported by UEs are used for signal processing at the
stream
transmitter, closed-loop spatial multiplexing is used. One or more data streams are transmitted.
Transmit diversity
When the PMIs reported by UEs are not used for signal processing at the transmitter, the specific technique used in non-MBSFN subframes depends on the number of antenna ports used for the physical broadcast channel (PBCH). If the number of antenna ports is 1, single antenna port 0 is used for transmission; otherwise, transmit transmit diversity is used. One data stream is transmitted.
Spatial multiplexing
When the PMIs reported by UEs are used for signal processing at the transmitter, spatial multiplexing is used. One or more data streams are transmitted.
Transmission Solutions Transmission solutions depend on transmission modes if the number of CRS ports has been determined. Table 4-3 4 -3 describes the transmission solutions in different transmission modes when there are
two CRS ports.
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Table 4-3 4 -3 Transmission solutions in different transmission modes with two CRS ports
Downlink Transmission Solution
Number of Codewor ds
Number of Layers
Rank ank
Tra rans nsmi miss ssiion Mode Mode
Space frequency
1
2
1
TM2
Large-delay cyclic Large-delay delay diversity (CDD) precoding, a form of open-loop spatial multiplexing
2
2
2
TM3
Precoding without CDD, a form of closed-loop spatial multiplexing
1
1
1
TM6
2
2
2
TM4
block coding (SFBC), a form of transmit diversity
4 -4 describes the transmission solutions in different transmission modes when there are Table 4-4 four CRS ports. Table 4-4 4 -4 Transmission solutions in different transmission modes with four CRS ports
Downlink Transmission Solution
Number of Codewor ds
Number of Layers
Rank ank
Tra rans nsmi miss ssiion Mode Mode
SFBC + frequency switched transmit diversity (SFBC
1
4
1
TM2
Large-delay CDD precoding, a form of of open-loop spatial multiplexing
2
2
2
TM3
2
3
3
2
4
4
Precoding without CDD, a form of closed-loop spatial multiplexing
1
1
1
TM6
2
2
2
TM4/TM9/TM10
2
3
3
2
4
4
+FSTD), a form of transmit diversity
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4.2 Multiple-Antenna Multiple-Antenna Reception Multiple-antenna reception is a MIMO technique in which multiple antennas are used to receive signals and certain algorithms are used to combine the received signals. Multipleantenna reception is supported by both eNodeBs and UEs, and that on UEs is similar to that on eNodeBs. This document describes multiple-antenna reception on eNodeBs. Multiple-antenna reception on eNodeBs includes receive diversity, uplink multi-user MIMO (MU-MIMO), and uplink single-user MIMO (SU-MIMO). Adaptation between receive diversity and MU-MIMO is supported by eNodeBs.
4.2.1 Receive Diversity Receive diversity is a technique in which signals and their copies are received and combined after passing through channels at different fading degrees. In receive diversity mode, a UE uses one antenna and dedicated time-frequency resources to transmit signals while an eNodeB uses multiple antennas to receive signals and then combines the received signals. This process maximizes the SINR, brings diversity and array gains, and improves cell capacity and coverage. Radio channels from a transmitter to a receiver may experience time-varying deep fading of 10 dB to 20 dB, dB, which will will lead to SINR fluctuations at the receiver. receiver. If the receiver uses multiple antennas for reception, there is a relatively low probability that deep fading occurs simultaneously on different antennas. As a result, the combined signals experience a lower probability of deep fading fading than the signals received received by a single antenna, antenna, obtaining diversity gains. White noises on different antennas are uncorrelated, and therefore the power of the combined noise remains unchanged. However, the energy of the combined signal increases several-fold, which brings array gains. Figure 4-3 shows the principles of receive diversity.
Figure 4-3 Principles of receive diversity
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The UE sends signal x signal x,, which passes through different channels to the eNodeB's antennas r 1 to r M. The eNodeB applies a weight wi to each received signal, and then combines the weighted signals into signal y signal y.. The combined signal can be expressed as follows: y y = = W (( Hx + Hx + N N ) The variables in the previous formula and figure are described as follows: l l
W = (w1 ... w M ) ):: 1x M vector vector composed of RX antenna weights. T H = (h1 ... h M ) : M x1 x1 vector composed of spatial channel coefficients. hi indicates the coefficient of channel i, and T is is a transpose operator. The channel coefficients are used to obtain the signals that change in amplitude and phase after passing through channels.
l
N = (n1 ... n M )T : M x1 x1 vector composed of received noises.
l
x x:: TX signal.
Signal combining, especially weight calculation, is key to receive diversity. For details about signal combining, see MRC see MRC and IRC Receivers Receivers..
4.2.2 Uplink MU-MIMO Uplink MU-MIMO is a technique that enables multiple UEs to perform data transmission simultaneously using the same time-frequency resources. It brings multiplexing gains in addition to diversity and array gains. Theoretically, the number of UEs that use the same timefrequency resources cannot exceed the number of RX antennas of the eNodeB. The key techniques of MU-MIMO are signal combining and UE pairing.
Principles Figure 4-4 uses uplink 2x2 MU-MIMO as an example for illustration. Figure 4-4 Uplink 2x2 MU-MIMO
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UE1 and UE2 use the same time-frequency resources to send signals x 1 and x2 to the eNodeB through channels (h11, h21, h12, and h22). The eNodeB detects UEs that use the same timefrequency resources, calculates the weights (W), applies the weights to the received signals, and performs signal combining. Specifically, the eNodeB combines the two groups of signals and obtains y1 and y2, the estimated values of x 1 and x2, respectively.
UE Pairing UE pairing is a process where an eNodeB selects a pair of suitable UEs for transmission and schedules the paired UEs. For example, it selects a pair of UEs that have approximately orthogonal channels or that will bring the maximum gain to the system. In general, the better the channel quality, the better the UE pairing effect. The MU-MIMO pairing procedure is as follows: 1.
Sele Select ctss ca cand ndid idat atee UEs. UEs. If a UE has been scheduled, the eNodeB attempts to pair it with another UE.
2.
Calc Calcul ulaates tes the the post post-- pairing pairing SINR and sp spectral ectral efficiency. The eNodeB calculates the post-pairing SINR of each UE based on the pre-pairing SINR and inter-UE channel correlation, and then calculates the post-pairing spectral efficiency efficiency..
The calculated post-pairing spectral efficiency may be different from the actual one because the pre-pairing SINR is measu measured red by the se serving rving cell b based ased on the current channel channel cond conditions itions but the paired UEs perform perform data transmission four subfra subframes mes later after the pairing.
3.
Pa Pair irss the the sele seleccted ted U UEs Es.. If the total post-pairing spectral efficiency is higher than the total pre-pairing spectral efficiency,, the eNodeB pairs the two UEs. Otherwise, the eNodeB does not pair the two efficiency UEs and rolls back to receive diversity.
4.
Sche Schedu dule less tthe he pair paired ed UEs. UEs. The eNodeB allocates the same time-frequency resources to the paired UEs for data transmission.
4.2.3 Uplink SU-MIMO Uplink SU-MIMO is a technique that enables a single UE to send multiple data streams simultaneously using the same time-frequency resources. resources. Uplink SU-MIMO is suitable for UEs that have two TX channels and work in TM2. For details, see 6.5 UL SU-MIMO.
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5
Downlink MIMO
5.1 Transmission Mode Configuration Transmission modes need to be determined for UEs in random access and subsequent 5 -1. scheduling based on the following parameters and Table 5-1 l
InitialMimoType: specifies an initial transmission mode. CellMimoParaCfg. InitialMimoType
l
CellMimoParaCfg. MimoAdaptiveSwitch MimoAdaptiveSwitch: specifies whether to use an adaptive transmission mode.
l
CellMimoParaCfg.FixedMimoMode: specifies a fixed transmission mode.
Table 5-1 5 -1 Transmission mode configuration
MimoAdap Initial tiveSwitch Mimo Setting Type Setting
Transmission Mode in Random Access Based on Contention
Transmission Mode in Random Access Not Based on Contention
Transmission Mode in Scheduling
TM2 None ADAPT NO_ADAPT IVE IVE
TM2 Depending on the value of CellMimoParaCfg .FixedMimoMode
TM2 Depending on the value of CellMimoParaCf g.FixedMimoMod e
None Depending on the value of CellMimoParaCfg. FixedMimoMode
OL_ADAPT IVE
TM3
TM2
TM3
CL_ADAPT IVE
TM4
TM2
TM4
OC_ADAPT IVE
TM3
TM2
TM3 or TM4
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In FDD, TM9 or TM10 is recommended in low-speed cells if a certain proportion of UEs support TM9 or TM10. TM9 and TM10 are controlled by the TM9Switch and TM10Switch options of the CellAlgoSwitch. EnhMIMOSwitch EnhMIMOSwitch parameter, respectively. TM9 and TM10 cannot be enabled simultaneously for a cell. l
TM9 is suitable for 2T cells with adaptive single frequency network (SFN) enabled and 4T cells with multi-user MIMO (MU-MIMO) enabled.
l
TM10 is suitable for 4T cells with adaptive SFN enabled.
For the applications of TM9 and TM10 in adaptive SFN cells, see SFN . For details about MUMIMO in TM9 in 4T cells, see eMIMO (FDD). (FDD). There are the following limitations on TM9: l
UE services to be transmitted in TM9 cannot be scheduled in MBSFN subframes where the physical multicast channel (PMCH) exists.
l
UE services to be transmitted in TM9 cannot be scheduled in MBSFN subframes that are configur eed d for enha enhanced nced symbol power saving.
l
For FDD, UE services to be transmitted in TM9 cannot be scheduled in subframes where OTDOA-based positioning reference signals are transmitted.
5.2 CRS Port Mapping (FDD) To avoid the adjustment of antenna connections after RF modules are connected to physical antennas, CRS port mapping is introduced to map CRS ports onto the TX channels of RF modules and further onto the physical antennas. CRS port mapping is required in cells working in at least 4T mode. Signal correlation between antennas varies depend depending ing on polarization direction. Adjusting Adjusting CRS port mapping can optimize signal correlation. correlation.
CRS port mapping can be understood as mapping CRS ports onto the TX ports of RF modules. The sequence of TX/RX ports of an RF module is fixed. For details, see the hardware description of the corresponding RF module.
CRS port mapping is controlled by the Cell.CrsPortMap parameter. By adjusting this parameter parameter, , you can change mapping CRS ports and TX channels. channeusing ls. The of this section describes CRS port the sequence andbetween CRS port mapping configuration therest example of a 4T4P cell (a cell with four TX channels and four CRS ports).
CRS Port Sequence Figure 5-1 illustrates the default and recommended configurations for a 4T4P cell on the assumption that the physical antennas are installed in non-cross mode. l
The default configuration refers to the default mapping between CRS ports and TX channels. It is used when the Cell.CrsPortMap parameter is set to NOT_CFG. For a 4T RRU, ports 0, 1, 2, and 3 are mapped onto TX channels A, B, C, and D, respectively. For two combined 2T RRUs, ports 0, 1, 2, and 3 are mapped onto TX channels A, B, A, and B, respectively.
l
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–
For a 4T RRU, set the Cell.CrsPortMap parameter to 4T4P_0321 to map CRS ports 0, 1, 2, and 3 onto TX channels channels A, D, C, and B.
–
For combined 2T RRUs, set the Cell.CrsPortMap parameter to 4T4P_0213 to map CRS ports 0, 1, 2, and 3 onto TX channels A, A, B, and B.
Figure 5-1 RRU-antenna connection in non-cross mode
Using the same setting for the Cell.CrsPortMap parameter results in different CRS port sequences on a 4T RRU and two combined 2T RRUs. l
For a 4T RRU, the digital sequence (ports 0, 1, 2, and 3) indicates the CRS port sequence on channels A, B, C, and D. However, the default channel sequence on RRU hardware is ACDB.
l
For two combined 2T RRUs, the digital sequence (ports 0, 1, 2, and 3) indicates the CRS port sequence on channels channels A, B, A, and B.
For example, if the Cell.CrsPortMap parameter is set to 4T4P_0213, then:
l
For a 4T RRU, the theoretical channel sequence and CRS port sequence are However, the actual sequences are
l
.
.
For two combined 2T RRUs, the theoretical channel sequence and CRS port sequence are
. The actual sequences are the same as the theoretical sequences.
CRS Port Mapping Configuration Table 5-2 5 -2 lists the CRS port sequences that apply for each setting of the Cell.CrsPortMap parameter for different different RRUs. Issue 01 (2019-06-06)
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Table 5-2 5 -2 CrsPortMap settings and actual CRS port sequences
4T4P or 4T2P
CrsPortMap Setting
CRS Port Sequence on TX Channels ACDB of a 4T RRU
CRS Port Sequence on TX Channels ABAB of Two Combined 2T RRUs
4T4P
4T4P_0213
0132
0213 (recommended for downlink 4x2 or 4x4 MIMO)
4T4P_0231
0312
0231
4T4P_0123 or NOT_CFG
0231
0123
4T4P_0132
0321
0132
4T4P_0312
0123
0312
4T4P_0321
0213 (recommended for downlink 4x2 or 4x4 MIMO)
0321
4T2P_0011 or NOT_CFG
0110
0 011 (reco2x2 mmMIMO) ended for downlink
4T2P_0101
0011 (recommended for downlink 2x2 MIMO)
0101
4T2P_0110
0101
0110
4T2P
The CRS port mapping principle for 4T2P cells is similar to that for 4T4P cells. The principle is not described here but the actual sequences indicated by the parameter settings are provided in this table. 4T1P cells do not require CRS port mapping. The Cell.CrsPortMap parameter needs to be set to NOT_CFG. If a cell is set up on an LBBPc, the number of CRS ports is equal to the number of physical antennas and the Cell.CrsPortNum parameter does not take effect. For example, if the LBBPc is configured to support 2T mode, the number of CRS ports is always 2, regardless of the Cell.CrsPortNum parameter value.
CRS Port-Channel Mapping Adjustment UEs measure the RSRP values of CRS ports 0 and 1 in accordance with 3GPP specifications. Therefore, when channel power is limited, raising the transmit power of ports 0 and 1 can increase the measured RSRP values and improve the cell coverage. CRS port-channel mapping adjustment can implement the preceding function. It applies to 4T4R cells with four physical antennas and four CRS ports. When multiple carriers exist on the same RF module, this function can implement intercarrier channel power sharing and adjust the mapping between CRS ports and physical Issue 01 (2019-06-06)
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channels while ensuring that the total power of the carriers on each channel does not exceed the channel power. In this way, the transmit power of ports 0 and 1 increases and the coverage 5 -3 and Table 5-4 describe the principle of CRS port-channel mapping improves. Table 5-3 adjustment; the mapping between CRS ports and physical channels of carrier 2 is adjusted. Table 5-3 5 -3 CRS port configuration with the same channel power value (with the CRS portchannel mapping adjustment function disabled)
Physical Channel
Channel A
Channel B
Channel C
Channel D
Total power (W)
60
60
60
60
Carrier 1 power (W)
Port 0
Port 2
Port 1
Port 3
30
30
30
30
Carrier 2 power (W)
Port 0
Port 2
Port 1
Port 3
30
30
30
30
Table 5-4 5 -4 CRS port configuration with different channel power values (with the CRS portchannel mapping adjustment function enabled)
Physical Channel
Channel A
Channel B
Channel C
Channel D
Total power (W)
60
60
60
60
Carrier 1 power (W)
Port 0
Port 2
Port 1
Port 3
40
20
40
20
Carrier 2 power (W)
Port 2
Port 0
Port 3
Port 1
20
40
20
40
The CRS port-channel mapping adjustment function is controlled by the PDSCHCfg . LogicalPortSwapSwitch LogicalPortSwapSwitch parameter. l
l
When the PDSCHCfg . LogicalPortSwapSwitch LogicalPortSwapSwitch parameter is set to OFF, the eNodeB determines the mapping between CRS ports and physical channels based on the Cell.CrsPortMap parameter. When the PDSCHCfg . LogicalPortSwapSwitch LogicalPortSwapSwitch parameter is set to SWAP_MODE_1 , the eNodeB adjusts the mapping between CRS ports and physical channels specified by the Cell.CrsPortMap parameter. It exchanges the physical channels corresponding to ports 0 and 2 and exchanges exchanges the physical channels channels corresponding to ports ports 1 and 3. For example, the Cell.CrsPortMap parameter is set to 4T4P_0213, the mapping between CRS ports and physical channels is
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, and the mapping is changed to
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the adjustment. The target carrier of the mapping adjustment function is selected by operators in multi-carrier scenarios. When different power values are set for physical channels, the transmit power values of CRS ports 0, 1, 2, and 3 depend depend on the baseline transmit power power and power offsets: offsets: l
The baseline transmit power is determined by the system bandwidth, CRS power, Pa, and Pb.
l
The power offsets of ports 0, 1, 2, and 3 are specified by the PDSCHCfg.TxPowerOffsetAnt0 PDSCHCfg. TxPowerOffsetAnt0 , PDSCHCfg. PDSCHCfg.TxPowerOffsetAnt1 TxPowerOffsetAnt1, TxPowerOffsetAnt2 , and PDSCHCfg. TxPowerOffsetAnt3 parameters, PDSCHCfg.TxPowerOffsetAnt2 PDSCHCfg. PDSCHCfg.TxPowerOffsetAnt3 respectively.
The CRS port-channel mapping adjustment function depends on the Cell.CrsPortMap parameter.. After the Cell.CrsPortMap parameter value is changed, the mapping between CRS parameter ports and physical channels channels adjusted by this function is also also changed. The CRS port-channel mapping adjustment function is mutually exclusive with virtual 4T4R (controlled by the Virtual4T4RSwitch option of the CellAlgoSwitch. EmimoSwitch EmimoSwitch parameter) and single carrier power power sharing for 4T (controlled (controlled by the SINGLE_CA_PWR_SHARE_SW_FOR_4T option of the PDSCHCfg .TxChnPowerCfgSw parameter).
5.3 CRS Port Mapping Detection and Reconfiguration (FDD) 5.3.1 Principles 5.3.1.1 Detection and Reconfiguration CRS port mapping detection involves the identification of no-spacing antenna combinations and co-polarization antenna combinations, which are illustrated in Figure 5-2 and described as follows: l
A no-spacing antenna combination consists of antennas with no spacing between them. For example, antennas A and B form a no-spacing antenna combination; antennas C and D form another.
l
A co-polarization antenna combination consists of antennas with the same polarization direction. For example, antennas A and C form a co-polarization antenna combination; antennas B and D form another. Figure 5-2 Physical antennas
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The Cell.CrsPortMap parameter setting may not be the optimum. The optimal mapping principles are: l
The antennas for CRS ports 0 and 2 form a no-spacing antenna combination. The antennas for CRS ports 1 and 3 form another another..
l
The antennas for CRS ports 0 and 1 form a co-polarization antenna combination. The antennas for CRS ports 2 and 3 form another another..
Huawei eNodeBs support CRS port mapping detection and reconfiguration. This function is controlled by the AutoRecfgSw AutoRecfgSwitch itch parameter in the STR CRSPORTOPTDET command. l
l
If this switch is on, the eNodeB operates based on whether CRS port mapping detection is successful. The detection result can be queried using the DSP CRSPORTOPTDET command.
–
If successful (that is, CRS Antenna Port Opt Mapping Detection Result is COMPLETE) and the current Cell.CrsPortMap parameter setting is not the optimum, the eNodeB automatically reconfigures this parameter.
–
If unsuccessful (that is, CRS Antenna Port Opt Mapping Detection Result is not COMPLETE), the eNodeB does not perform any processing.
If this switch is off, the eNodeB checks the Cell.CrsPortMap parameter setting and detects the optimal mapping but does not reconfigure this parameter. parameter. During the detection, the eNodeB identifies co-polarization antenna combinations by selecting UEs in a cell for channel estimation and calculating the correlation between channels. The number of UEs selected per cell per hour is specified by the CrsAntPortOptDetUserNum parameter in the STR CRSPORTOPTDET command. mand. CRSPORTOPTDET com
–
Selecting a larger number of UEs will result in more accurate detection results because there are are more samples for channel estimation. However, However, it may may affect resource allocation in the cell.
–
Selecting a smaller number of UEs will have a smaller impact on resource allocation in the cell. However, it may affect the accuracy of detection results because there are are fewer samples samples for channel estimation.
5.3.1.2 Example The connections between antennas and RRUs are shown in Figure 5-3. The initial configuration is presented in the left part of the figure. The Cell.CrsPortMap parameter is set to 4T4P_0321 and the mapping between CRS ports and TX channels is . The antennas for CRS ports 0 and 2 form a co-polarization antenna combination, and the antennas for CRS ports 1 and 3 form another. However However,, the two combinations should be no-spacing antenna combinations to ensure transmit diversity gains. The optimal setting obtained after CRS port mapping detection is 4T4P_0213 and the mapping between CRS ports and TX channels is figure.
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, as shown in the right part of the
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Figure 5-3 CRS port mapping reconfiguration
5.3.2 Network Analysis 5.3.2.1 Benefits The CRS port mapping detection and reconfiguration function allows operators to adjust related parameters to adapt to different physical connections without conducting onsite operations. Physical connections between antennas and RF modules are detected based on RX signal strength changes on each antenna at different downtilt angles and correlation between uplink channels of the UE. RX signal strength and uplink channel correlation are affec affected ted by many factors, for example, antenna downtilt angles, propagation paths, and external interference. Therefore, there may be no results after a detection. In this case, multiple detections are required. If there are still no results after multiple detections, onsite operations are required because the ambient ambien t environments toofor complex. complex. When UEs are are inDirect a cell these or UEs are aretoat the cell edge, drive-test UEs can beare used detection in thenocell center. UEs the antennas and move them within the range of 50 m to 100 m. During this process, ensure that the UEs are in RRC_CONNECTED mode. The expected detection completion rate is 90%. If there are no detection results after multiple detections, it is recommended that the electrical downtilt angles of antennas be configured for cells. The detection result error rate does not exceed 1% if detections are successfully completed. The User Downlink Average Throughput increases by 1% to 5% in cells where the actual CRS port mapping is changed to the optimal mapping.
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5.3.2.2 Impacts Network Impacts If the electrical downtilt angles of antennas are configured for a cell, adjusting the downtilt angles during the detection will have a negative impact of 30% on the basic network KPIs of LTE. If the antenna system is shared by GSM, UMTS, and LTE, adjusting the downtilt angles of antennas will affect the network KPIs of GSM and UMTS.
Function Impacts Function Name
Function Switch
Reference
Intelligent power-of power-off f of carriers in the same coverage
CellShutdown.CellS Energy CellShutdown.CellS hutdownSwitch Conservation and parameter being set set to Emission ON Reduction
Description In "intelligent power-offf of carriers power-of in the same coverage" mode, CRS port mapping detection and reconfiguration are not supported. If the conditions for entering "intelligent power-offf of carriers power-of in the same coverage" mode are met in a cell undergoing CRS port mapping detection, the cell will enter this mode and the detection will be interrupted.
Low power mode consumption
CellLowPower. Low Low PwrSwitch
Energy Conservation and Emission Reduction
In low power mode, consumption CRS port mapping detection and reconfiguration are not supported. If the conditions for entering low power consumption mode are met in a cell undergoing CRS port mapping detection, the cell will enter this mode and the detection will be interrupted.
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Function Name
Function Switch
Reference
Description
RF module regular time sleep mode
eNodeBAutoPower AutoPowerOffS Off. AutoPowerOffS witch
Energy Conservation and Emission Reduction
In RF module regular time sleep mode, CRS port mapping detection and reconfiguration are not supported. If the conditions for entering RF module regular time sleep mode are met in a cell undergoing CRS port mapping detection, the cell will enter this mode and the detection will be interrupted.
Intelligent power-of power-off f of carriers in the same coverage as UMTS networks
InterRatCellShutdown.ForceShutdow down. ForceShutdow nSwitch
Energy In "intelligent Conservation and power-of power-offf of carriers Emission in the same coverage Reduction
as UMTS networks" mode, CRS port mapping detection and reconfiguration are not supported. If the conditions for entering "intelligent power-offf of carriers power-of in the same coverage as UMTS networks" mode are met in a cell undergoing CRS port mapping detection, the cell will enter this mode and the detection will be interrupted.
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Function Name
Function Switch
Reference
Description
Multi-RAT Carrier Joint Shutdown
InterRatCellShut InterRatCellShutdown.ForceShutdow nSwitch
Multi-RAT Carrier Joint Shutdown
In Multi-RAT Carrier Joint Shutdown mode, CRS port mapping detection and reconfiguration are not supported. If the conditions for entering Multi-RAT Carrier Joint Shutdown mode are met in a cell undergoing CRS port mapping detection, the cell will enter this mode and the detection will be interrupted.
5.3.3 Requirements 5.3.3.1 Licenses None
5.3.3.2 Software Before activating this function, ensure that its prerequisite functions have been activated and mutually exclusive functions have been deactivated. For detailed operations, see the relevant feature documents.
Prerequisite Functions None
Mutually Exclusive Functions Function Name Virtual 4T4R
Downlink extended CP Uplink extended CP
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Function Switch
Reference
Virtual4T4RSwitch option of the CellAlgoSwitch. EmimoSwi EmimoSwi tch parameter
Virtual 4T4R (FDD)
DlCyclicPrefix Cell. DlCyclicPrefix
Extended CP
Cell.UlCyclicPrefix
Extended CP
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Function Name
Function Switch
Reference
Cell. MultiRruCellFlag MultiRruCellFlag
Cell Management
NB-IoT cell
None
NB-IoT Basics (FDD)
RF channel intelligent shutdown
RfShutdo CellRfShutdown. RfShutdo wnSwitch
Energy Conservation Conservation and Emission Reduction
Multi-sector cell
5.3.3.3 Hardware Base Station Models 3900 and 5900 series base stations are compatible with this function.
Boards 4T4R BBPs can be used, for example, LBBPd2, UBBPd3, UBBPd4, or UBBPd5.
RF Modules 4T4R RF modules or 2T4R RF modules combined for 4T4R can be used. 2T2R RF modules can be used only when certain conditions are met. To find out whether a 2T2R RF module can be used, perform the following steps: st eps: 1.
Run the DSP CELLPHYTOPO command to obtain the cabinet, subrack, and slot numbers of an RF module.
2.
Run the DSP BRDMFRINFO command and check the Description field. If the field value is V3, V6, or KUNLUN, the RF module supports this function.
Active antenna units (AAUs) do not support this function.
Cells Cells must meet the following requirements: l
The cell bandwidth is 5 MHz or more, and an integrated 4T4R antenna is used.
l
The uplink bandwidth is the same as the downlink bandwidth.
l
The uplink CP configuration is the same as the downlink CP configuration.
l
The work mode is neither DL_ONLY DL_ONLY nor LAA, and RF loopback is not enabled.
This function applies only to 4T4R cells, not the following cells: l
2T2R cells
l
8T8R cells
l
Massive MIMO cells
l
SFN cells
l
Cells generated by dividing signals of an RRU and directing them to multiple antennas
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This function is not suitable for scenarios with software-defined antennas, vertically stacked antennas, or 4T6S. It is recommended that the electrical downtilt angles of antennas be configured for cells. Such cells must meet the following conditions: l
The antennas support remote electrical tilt (RET) control, and the RRU ports that support RET control are correctly connected to the antenna ports.
l
In separate-MPT scenarios, the RET antennas must be configured on the LTE side.
5.3.3.4 Others None
5.3.4 Operation and Maintenance 5.3.4.1 Data Configuration 5.3.4.1.1 Data Preparation Table 5-5 5 -5 describes the parameters used for function activation. Table 5-5 5 -5 Parameters used for activation
Parameter Name
Parameter ID
Setting Notes
Automatic Reconfigure Switch
AutoRecfgSwitch AutoRecfgSwitch parameter in the STR CRSPORTOPTDET command
For detection, turn off this switch.
CrsAntPortOptDetUser Num parameter in the STR CRSPORTOPTDET
For drive tests in new cells, you are advised to set this parameter to the maximum value.
command
On commercial networks, set this parameter to its recommended value.
CRS Ant Port Opt Mapping Detection User Number
For reconfiguration, turn on this switch.
5.3.4.1.2 Using MML Commands
Activation Command Examples //Starting detection STR CRSPORTOPTDET: AutoRecfgSwitch=OFF,CrsAntPortOptDetUserNum=3; //Starting reconfiguration after the detection, which will lead to an automatic cell reset STR CRSPORTOPTDET: AutoRecfgSwitch=ON;
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Optimization Command Examples The antennas support RET control, and the RRU ports that support RET control are correctly connected to the antenna ports. The following provides an example for setting an antenna device number. //Querying the device number of the RET antenna used by the LTE cell LST RET; //Querying the cabinet, subrack, and slot numbers of the RRU of the LTE cell LST RRU; //Binding the RET antenna to the RRU //For an RRU (RRU RRU (RRU 60) 60) that that does not share the antenna system with others MOD RETSUBUNIT:DEVICE RETSUBUNIT:DEVICENO=0,SUBUNITNO=1,CONNCN1=0,CONNSRN1=60,CONNSN1=0,CONNPN1=R0A; NO=0,SUBUNITNO=1,CONNCN1=0,CONNSRN1=60,CONNSN1=0,CONNPN1=R0A; //For two 4T4R RRUs (RRUs 60 and 61) that share the same antenna system MOD RETSUBUNIT:DEVICENO=0,SUBUNITNO=1,CONNCN1=0,CONNSRN1=60,CONNSN1=0,CONNPN1=R0A,CONN CN2=0,CONNSRN2=61,CONNSN2=0,CONNPN2=R0A;
5.3.4.2 Verification and Monitoring Activation Verification Step 1 Run the DSP CRSPORTOPTDET command to query the status of CRS port mapping detection and reconfiguration.
Step 2 Check the output items listed in Table 5-6. ----End Table 5-6 5 -6 Output of CRS port mapping detection and reconfiguration
Field
Description
CRS Antenna Port Opt Mapping Detection Result
Indicates the result of CRS port mapping detection for optimization.
Curr Curren entt C CRS RS Ante Antenn nnaa P Por ortt M Map appi ping ng
Indi Indica cate tess tthe he cu curr rren entt map mappi ping ng betw betwee een n CRS CRS ports and RRU channels. channels.
Opti Op tima mall C CRS RS Ante Antenn nnaa P Por ortt M Map appi ping ng
Indi Indica cate tess the the opti optima mall m map appi ping ng betw betwee een n CRS CRS ports and RRU channels. channels.
CRS Opt Det Completion Status
Indicates the CRS detection comple lettion sta tattus of the entire base station.
CRS Optimizatio Optimization n De Detecti tection on P Progre rogress(%) ss(%)
Indicates Indicates the CRS detection detection progress progress of the the entire base station.
Table 5-7 5 -7 explains the values of CRS Antenna Port Opt Mapping Detection Result .
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Table 5-7 5 -7 Detection result values
Field Name
Parameter ID
Field Value
CRS Antenna Port Opt Mapping Detection Result
GlobalProcSw N/A itch.CrsAntPor tOptDetResult RUNNING
Meaning No detection Detecting
FAILURE COMPLETE
Detection failed Detection completed
SCENARIO_NOT_SUPP ORTED
Scenario not supported
FAILURE_HIGHER_PRI ORITY_TASK_DISRUP TION
Detection failed: a higher-priority task disrupted the detection
FAILURE_TIMEOUT
Detectio ion n failed: timeout
Network Monitoring l Detection completion rate = Number of COMPLETE cells / (Number of COMPLETE cells + Number of FAILURE cells + Number of FAILURE_TIMEOUT cells). In this formula, the numbers are obtained from the CRS Antenna Port Opt Mapping Detection Result. It is recommended that the number of detections for a cell be greater than 3. As long as one of the detections is successful, the detection for this cell is successful and the cell is counted as a COMPLETE cell. l
l
Detection result error rate = Number of cells where the detected connections are inconsistent with the actual connections / Total number of monitored cells. Spot checks on site can be performed to determine whether the detected connections are consistent with the actual connections. It is recommended that the number of detection samples be greater than 300 and the calculated detection result error rate be rounded down. For example, if the calculated value is 1.1%, round it down to 1%. User Downlink Average Throughput
5.4 DL 4-Antenna Transmit Diversity (FDD) This section mainly describes downlink 4-antenna transmit diversity in NB-IoT NB-IoT..
5.4.1 Principles Downlink multiple-antenna transmission is a technique where the eNodeB uses multiple antennas for signal transmission and uses a special algorithm for processing. Transmit diversity is a diversity scheme in which the transmitter uses multiple antennas to send signals and their copies after encoding based on low correlation between spatial channels, time selectivity, and frequency selectivity. The receiver then combines these signals and their copies, which travel through paths at different fading degrees. This process brings diversity gains and improves transmission reliability. reliability. Figure 5-4 shows the downlink 4-antenna transmit diversity. Issue 01 (2019-06-06)
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Figure 5-4 Downlink 4-antenna transmit diversity
For NB-IoT, NB-IoT, the mapping of narrowband reference signal (NRS) antenna ports on physical antennas is determined by the mapping of NRS antenna ports on RRU channels. A maximum of two NRS antenna ports are supported. The specific number is specified by the Cell.CrsPortNum parameter. When there are two antenna ports (ports 0 and 1), space frequency block coding (SFBC) is adopted. The mapping between NRS antenna ports and RRU channels is specified by the Cell.CrsPortMap parameter parameter.. For example, if the TX/RX mode is 4T4R and two NRS antenna ports are configured, configured, it is recommended that the the Cell. Cell.CrsPortMap CrsPortMap parameter be set to 4T2P_0101 . Thatand is, NRS +45º, -45º, +45º, -45º. antenna ports 0, 0, 1, and 1 are mapped onto physical antennas
Antenna ports mentioned in this document are logical ports used for transmission. They do not have one-to-one relationship with physical antennas. Signals on one antenna port can be transmitted over one or more physical antennas.
5.4.2 Network Analysis 5.4.2.1 Benefits When the transmit power of each RRU channel is limited, the transmit power in 4T2P mode is more likely to double that in 2T2P mode, improving downlink coverage. Assume that downlink 4-antenna transmit diversity uses the same number of NRS antenna ports as downlink 2-antenna 2-antenna transmit diversity but doubles the total transmit power. power. Then, downlink 4-antenna transmit diversity offers the following benefits: l
Increases the average downlink cell throughput by 10% to 20%.
l
Improves coverage by 1 dB to 3 dB.
l
Reduces the number of occupied downlink subcarriers and the downlink subcarrier usage.
The preceding benefits are affected by interference from neighboring cells: l
Strong interference from neighboring cells results in an increase in the power in the serving cell and neighboring cells and a nearly imperceptible increase in the signal-tonoise ratio (SNR). Consequently, power gains and capacity gains are small.
l
Weak interference from neighboring cells results in a more significant increase in the power in the serving cell cell than that in neighboring cells cells as well as a significant significant increase in the SNR. Consequently, power gains and capacity gains are large.
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The following uses the average downlink cell throughput as an example: l
When interference from neighboring cells is very strong, downlink 4-antenna transmit diversity cannot provide a higher throughput than downlink 2-antenna transmit diversity diversity..
l
When there is no interference from neighboring cells, downlink 4-antenna transmit diversity can provide a throughput 20% higher than downlink 2-antenna transmit diversity.
5.4.2.2 Impacts Network Impacts In LTE in-band deployment, when channel calibration is performed for combined LTE FDD RRUs: l
If the NB-IoT cell is activated, channel calibration affects NB-IoT services. The bit error rates (BERs) of narrowband physical downlink control channel (NPDCCH) and narrowband physical downlink shared channel (NPDSCH) increase by no more than 10%.
l
In other situations, channel calibration does not affect NB-IoT services.
Function Impacts None
5.4.3 Requirements 5.4.3.1 Licenses Downlink 4-antenna transmit diversity is a basic function, and therefore is not under license control.
5.4.3.2 Software Prerequisite Functions None
Mutually Exclusive Functions None
5.4.3.3 Hardware Base Station Models 3900 and 5900 series base stations are compatible with this function.
Boards BBPs must be UBBPd4/UBBPd5/UBBPd6 or UBBPe2/UBBPe4/UBBPe5/UBBPe6. Issue 01 (2019-06-06)
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RF Modules For the models of RF modules that support NB-IoT NB-IoT,, see technical descriptions in base station product documentation.
5.4.3.4 Networking Downlink 4-antenna transmit diversity requires that the eNodeB have at least four transmit channels and at least four physical antennas.
5.4.3.5 Others If physical antennas are combined for use, downlink 4-antenna transmit diversity has the same antenna requirements as uplink 4-antenna receive diversity.
5.4.4 Operation and Maintenance 5.4.4.1 Data Configuration 5.4.4.1.1 Data Preparation Data preparation for downlink 4-antenna transmit diversity is the same as that for uplink 4antenna receive diversity. For details, see 6.2.4.1.1 Data Preparat Preparation ion.
5.4.4.1.2 Using MML Commands Commands Multiple-antenna transmission and reception are configured together when sectors and cells are configured. Command examples for downlink 4-antenna transmit diversity are the same as those for uplink 4-antenna receive diversity. diversity. For details, see 6.2.4.1.3 Using MML Commands (NB-IoT).
5.4.4.1.3 Using the CME For detailed operations, see CME-based Feature Configuration.
5.4.4.2 Verification and Monitoring 5.4.4.2.1 Activation Verification Use the RRU/RFU/BRU output power monitoring function on the U2020 or the output power monitoring function on the Web LMT to monitor the output power power.. l
In standalone or LTE guard band deployment mode, compare the four NB-IoT channels' output power values displayed with those configured. If the differences are less than 0.5 dB, four antennas are configured for transmission and downlink 4-antenna transmit diversity has been activated.
l
In LTE in-band deployment mode, compare the four LTE FDD channels' output power values displayed with those configured. If the differences are less than 0.5 dB, four antennas are configured for transmission and downlink 4-antenna transmit diversity has been activated.
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5.4.4.2.2 Network Monitoring The values of the following performance indicators will increase after downlink 4-antenna transmit diversity is enabled. l
Average downlink MCS index = (1 x L.NB.ChMeas.NPDSCH.MCS.1 + 2 x L.NB.ChMeas.NPDSCH.MCS.2 + ... + 13 x L.NB.ChMeas.NPDSCH.MCS.13 ) / (L.NB.ChMeas.NPDSCH.MCS.0 + L.NB.ChMeas.NPDSCH.MCS.1 + L.NB.ChMeas.NPDSCH.MCS.2 + ... + L.NB.ChMeas.NPDSCH.MCS.13 )
l
Average downlink throughput = L.NB.Thrp.bits.DL / L.NB.Thrp.Time.DL
5.5 DL 2x2 MIMO 5.5.1 Principles Downlink 2x2 MIMO can be used only in cells configured with at least two CRS ports, and only for 2R UEs (UEs with two RX channels), as shown in Figure 5-5. Figure 5-5 Downlink 2x2 MIMO
Table 5-8 5 -8 lists the parameters used for this feature. Table 5-8 5 -8 Parameter used for downlink 2x2 MIMO
Parameter Name CRS Port Number
Maximum number of MIMO layers MIMO Adaptive Switch
Parameter ID
Setting Notes
Cell.CrsPortNum
The value CRS_PORT_2 is recommended.
MaxM CellDlschAlgo. MaxM imoRankPara
Set this parameter to SW_MAX_SM_RANK_2 .
CellMimoParaCfg. M M imoAdaptiveSwitch
The value NO_ADAPTIVE is recommended generally. The value CL_ADAPTIVE is recommended if the benefits of closed-loop adaptation have been verified.
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Parameter Name Fixed MIMO Mode
Parameter ID
Setting Notes
CellMimoParaCfg.Fi xedMimoMode
Set this parameter to TM3.
5.5.2 Network Analysis 5.5.2.1 Benefits Table 5-9 5 -9 describes the improvements provided by downlink 2x2 MIMO over downlink single-input single-output (SISO). Table 5-9 5 -9 Improvements provided by downlink 2x2 MIMO
Improvement
Description
Increases downlink peak throughput by approximately 100%.
A single UE far away from the cell center will experience high gains.
Increases downlink edge throughput.
An cell that UEsentire far away fromaccommodates the cell center many will experience high gains.
Improves downlink cell coverage.
None
The performance of this feature cannot be ensured in closed-loop transmission mode if RRUs are combined for use or the "RRU Channel Cross Connection Under MIMO" feature is used. Downlink 2x2 MIMO requires that TX channels be connected to physical antennas in different polarization directions. Otherwise, the gains may be reduced.
5.5.2.2 Impacts Network Impacts None
Function Impacts None
5.5.3 Requirements
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5.5.3.1 Licenses RAT
Feature ID
Feature Name
Model
Sales Unit
FDD
LOFD-001001
DL 2x2 MIMO
LT1S0D2I2O00
Per Cell
For FDD, when the Cell.CrsPortNum parameter is set to CRS_PORT_4 or the number of physical antennas is greater than or equal to 4, the license for LOFD-001003 DL 4x2 MIMO needs to be purchased. purchase d.
In addition to feature licenses, capacity licenses are required for MIMO. Each BBP is licensed by default to provide two baseband TX channels channels and two baseband RX channels for each each cell. Each RF module is licensed by default to provide two RF TX channels and two RF RX channels. For details, see License see License Control Control Item Lists (FDD). (FDD).
5.5.3.2 Software Prerequisite Functions None
Mutually Exclusive Functions None
5.5.3.3 Hardware Base Station Models No requirements
Boards No requirements
RF Modules No requirements
5.5.3.4 Others UEs must support 2R.
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5.5.4.1.1 Data Preparation Uplink MIMO and downlink MIMO are configured together in actual applications. Therefore, both uplink and downlink parameters parameters are listed here here while other parameters parameters for cell setup setup are not. Table 5-10 describes the parameters used for activation using the setup of a 2T2R cell as an example. Table 5-10 5 -10 Parameters used for activation
RAT
Parameter Name
Parameter ID
Setting Notes
FDD
Cell transmission and reception mode
Cell.TxRxMode
Set this parameter to 2T2R .
FDD
CRS Port Number Cell.CrsPortNum
Set this parameter to CRS_PORT_2.
FDD
Maximum number of MIMO layers
Set this parameter to SW_MAX_SM_RANK_2 .
CellDlschAlgo. Max Max MimoRankPara
5.5.4.1.2 Using MML Commands (FDD)
Activation Command Examples Set up a 2T2R cell. //Adding a sector and a set of sector equipment after adding an RRU ADD SECTOR: SECTORID=0, ANTNUM=2, ANT1CN=0, ANT1SRN=60, ANT1SN=0, ANT1N=R0A, ANT2CN=0, ANT2SRN=60, ANT2SN=0, ANT2N=R0B, CREATESECTOREQM=TRUE, SECTOREQMID=0; ADD SECTOREQM: SECTOREQMID=0, SECTORID=0, ANTCFGMODE=ANTENNAPORT, ANTNUM=2, ANT1CN=0, ANT1SRN=60, ANT1SN=0, ANT1N=R0A, ANTTYPE1=RXTX_MODE, ANT2CN=0, ANT2SRN=60, ANT2SN=0, ANT2N=R0B, ANTTYPE2=RXTX_MODE; //Adding an FDD cell ADD CELL: LocalCellId=0, CellName="cell0", FreqBand=12, UlEarfcnCfgInd=NOT_CFG, DlEarfcn=5020, UlBandWidth=CELL_BW_N50, DlBandWidth=CELL_BW_N50, CellId=0, PhyCellId=0, FddTddInd=CELL_FDD, RootSequenceIdx=0, CustomizedBandWidthCfgInd=NOT_CFG, EmergencyAreaIdCfgInd=NOT_CFG, UePowerMaxCfgInd=NOT_CFG, MultiRruCellFlag=BOOLEAN_FALSE, TxRxMode=2T2R,CrsPortNum=CRS_PORT_2; //Adding cell sector equipment ADD EUCELLSECTOREQM: LocalCellId=0, SectorEqmId=0; //Adding an operator for the cell ADD CELLOP: LocalCellId=0, TrackingAreaId=0; //Setting the maximum number of MIMO layers MOD CELLDLSCHALGO: LocalCellId=0, MaxMimoRankPara=SW_MAX_SM_RANK_2; //Setting a fixed transmission mode for the cell MOD CELLMIMOPARACFG: LocalCellId=0,MimoAdaptiveSwitch=NO_ADAPTIVE,FixedMimoMode=TM3,InitialMimoType=ADA PTIVE; //Activating cell 0 ACT CELL: LocalCellId=0;
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5.5.4.1.3 Using the CME For detailed operations, see CME-based Feature Configuration.
5.5.4.2 Verification and Monitoring Activation Verification Use the counters listed in Table 5-11 to monitor downlink MIMO with transmission modes adaptively configured. If any counter has a non-zero value, downlink 2x2 MIMO has taken effect. Table 5-11 Counters used to monitor downlink MIMO with transmission modes adaptively configured
Counter ID
Counter Name
1526727391 L.ChMeas.MIMO.PR B.CL.Rank1
Counter Description
Corresponding Feature
Total number of physical resource blocks (PRBs) used for rank 1 transmission in downlink closed-loop MIMO
DL 2x2 MIMO
1526727392 L.ChMeas.MIMO.PR B.CL.Rank2
Total number of PRBs used for rank 2 transmission in downlink closed-loop MIMO
1526727393 L.ChMeas.MIMO.PR B.OL.Rank1
Total number of PRBs used for rank 1 transmission in downlink open-loop MIMO
1526727394 L.ChMeas.MIMO.PR B.OL.Rank2
Total number of PRBs used for rank 2 transmission in downlink open-loop MIMO
DL 4x2 MIMO DL 4x4 MIMO
Network Monitoring None
5.6 DL 4x2 MIMO (FDD) 5.6.1 Principles Downlink 4x2 MIMO can be used only in only in a cell configured configured with at least four CRS ports and only for 2R UEs. Figure 5-6 shows downlink 4x2 MIMO.
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5 Downlink MIMO
Figure 5-6 Downlink 4x2 MIMO
Table 5-12 5 -12 lists the parameters used for this feature. Table 5-12 5 -12 Parameter used for downlink 4x2 MIMO
Parameter Name CRS Port Number
Maximum number of MIMO layers MIMO Adaptive Switch
Parameter ID
Setting Notes
Cell.CrsPortNum
Set this parameter to CRS_PORT_4.
CellDlschAlgo. MaxMimoR MaxMimoR ankPara
Set this parameter to SW_MAX_SM_RANK_2 .
MimoA CellMimoParaCfg. MimoA daptiveSwitch
Set this parameter to CL_ADAPTIVE.
5.6.2 Network Analysis 5.6.2.1 Benefits Table 5-13 5 -13 describes the benefits offered by downlink 4x2 MIMO. Table 5-13 5 -13 Benefits offered by downlink 4x2 MIMO
Improv Imp roveme ement nt ov over er Downli Downlink nk 2x2 MIMO MIMO
Descri Descripti ption on
Decreases the peak throughput by no more than 2.3%.
None
Increases the Cell Downlink Average Throughput by up to 15%.
For a single UE, the farther away it is from the cell center, the higher the gains are.
Increases the downlink edge throughput by 10% to 40%.
Improves the downlink cell coverage.
For a cell, the more cell-edge users (CEUs) it accommodates, the higher the gains are. None
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Downlink 4x2 MIMO requires that the feeders between physical antennas and RRUs be of the same type, the feeders be shorter than 75 m, and the difference in length between the feeders be less than 1 m.
5.6.2.2 Impacts Network Impacts None
Feature Impacts None
5.6.3 Requirements 5.6.3.1 Licenses Feature ID
Feature Name
Model
Sales Unit
LOFD-001005
UL 44-Antenna Receive Diversity
LT1S0U4ARD00
Per Cell
LOFD-001001
DL 2x2 MIMO
LT1S0D2I2O00
Per Cell
LOFD-001003
DL 4x2 MIMO
LT1S0D4I2O00
Per Cell
In addition to feature licenses, capacity licenses are required for MIMO. Each BBP is licensed by default to provide two baseband TX channels channels and two baseband RX channels for each each cell. Each RF module is licensed by default to provide two RF TX channels and two RF RX channels. For details, see License see License Control Control Item Lists (FDD). (FDD).
5.6.3.2 Software Prerequisite Functions None
Mutually Exclusive Functions None
5.6.3.3 Networking The networking requirements for downlink 4x2 MIMO are the same as those for downlink 4x4 MIMO. For details, see 5.7.3.4 Networking (FDD).
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5.6.3.4 Hardware Base Station Models This function requires 3900 or 5900 series base stations.
Boards This function requires 4T4R BBPs.
RF Modules No requirements
5.6.3.5 Others UEs must support 2R. To achieve stable benefits from closed-loop MIMO, it is recommended that RRU ports and antenna ports be connected using jumpers (or feeders) with the same length, regardless of whether integrated or combined RRUs are used. If one or more jumpers (or feeders) are connected to a combiner, it is required that the difference in delay between channels induced by the combiner and jumpers jumpers (or feeders) feeders) meet the requirements requirements in Table 5-14 5 -14. Table 5-14 5 -14 Requirements for inter-channel inter-channel delay difference difference
System Bandwidth
Requirements for Inter-Channel Delay Difference
20 MHz
Less than 10 ns
15 MHz
Less than 13.3 ns
10 MHz
Less than 20 ns
5 MHz
Less than 40 ns
≤ 3 MHz
Less than 65 ns
If the inter-channel delay difference does not meet the preceding requirements, there will be a significant deterioration in the performance of downlink 4x2 MIMO in closed-loop mode. The larger the delay difference, the higher the degree of deterioration. Assume that the bandwidth is 10 MHz and inter-channel inter-channel delay delay difference difference is introduced at ports ports D and B. Then, the delay difference affects performance, performance, as listed in Table 5-15.
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Table 5-15 5 -15 Impact of inter-channel delay difference on performance
Inter-Channel Delay Difference
Average Throughput (Mbit/s)
Average SINR (dB)
Proportion of Rank 2 Transmissions
Throughput Change
4x2 MIMO (baseline)
29.78
11.41
70.87%
-
4x2 MIMO + 10 ns
29.78
11.22
69.64%
Remains unchanged
4x2 MIMO + 20 ns
28.59
11.06
61.31%
-4.00%
4x2 MIMO + 30 ns
23.75
11.21
34.86%
-20.25%
4x2 MIMO + 50 ns
22.37
11.34
33.96%
-24.88%
The preceding test results are reference only forchange estimating of inter-channel delay difference on 4T performance. The results will withthe testimpact conditions. If combiners are required in engineering, note the following: l
l
It is recommended that other channels be connected to the same types of combiners to ensure that the inter-channel delay difference meets the requirements in the preceding table. However, this solution increases component costs and engineering costs. If other channels are not connected to combiners, you need to measure the delay induced by the existing combiner, combiner, estimate the delay difference difference caused caused by the difference difference between jumpers (and feeders), feeders), and use MML commands commands to provide delay compensation compensation for other channels. This solution requires a vector network analyzer (VNA) for combiner delay measurement.
5.6.4 Operation and Maintenance 5.6.4.1 Data Configuration 5.6.4.1.1 Data Preparation In actual applications, uplink MIMO and downlink MIMO are configured together. together. Therefore, both uplink and downlink parameters parameters are listed here here while other cell-setup cell-setup parameters are are not. Table 5-16 5 -16 describes the parameters used for activation using the setup of a 4T4R cell as an example.
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Table 5-16 5 -16 Parameters used for activation
Parameter Name
Parameter ID
Option
Setting Notes
Cell transmission and reception mode
Cell.TxRxMode
None
Set this parameter to 4T4R .
CRS Port Number
Cell.CrsPortNum
None
Set this parameter to CRS_PORT_4.
CRS Antenna Port Mapping
Cell.CrsPortMap
None
Set this parameter to NOT_CFG.
Maximum number of MIMO layers
CellDlschAlgo. Ma Ma xMimoRankPara
None
Set this parameter to SW_MAX_SM_RANK _2.
Compatibility Control Switch
ENodeBAlgoSwitc h.CompatibilityCtrl Switch
Tm3Tm4Max4La yerCtrlSwitch
Select this option.
5.6.4.1.2 Using MML Commands
Activation Command Examples Change 2T2R and 2T4R cells to 4T4R cells. l
Changing a 2T2R cell to a 4T4R cell
//Deactivating cell 0 DEA CELL: LocalCellId=0; //Modifying sector and sector equipment configurations MOD SECTOR: SECTORID=0, OPMODE=ADD, ANTNUM=2, ANT1CN=0, ANT1SRN=60, ANT1SN=0, ANT1N=R0C, ANT2CN=0, ANT2SRN=60, ANT2SN=0, ANT2N=R0D; MOD SECTOREQM: SECTOREQMID=0, OPMODE=ADD, ANTNUM=2, ANT1CN=0, ANT1SRN=60, ANT1SN=0, ANT1N=R0C, ANTTYPE1=RXTX_MODE, ANT2CN=0, ANT2SRN=60, ANT2SN=0, ANT2N=R0D, ANTTYPE2=RXTX_MODE; //Changing the number of CRS ports and CRS port mapping. This is a high-risk operation and you are advised to use the following parameter settings when setting up the cell. MOD CELL: LocalCellId=0, CrsPortNum=CRS_PORT_4, TxRxMode=4T4R, CrsPortMap=NOT_CFG; //Setting the maximum number of MIMO layers MOD CELLDLSCHALGO: LocalCellId=0,MaxMimoRankPara=SW_MAX_SM_RANK_2; //Setting a fixed transmission mode for the cell MOD CELLMIMOPARACFG: LocalCellId=0,MimoAdaptiveSwitch=NO_ADAPTIVE,FixedMimoMode=TM4,InitialMimoType=ADA PTIVE; //Enabling MIMO at a maximum of four layers for UEs of categories 6 or higher (not category 5) MOD ENODEBALGOSWITCH: COMPATIBILITYCTRLSWITCH=Tm3Tm4Max4LayerCtrlSwitch-1; //Activating cell 0 ACT CELL: LocalCellId=0;
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Changing a 2T4R cell to a 4T4R cell
//Deactivating cell 0 DEA CELL: LocalCellId=0; //Modifying sector and sector equipment configurations MOD SECTOREQM: SECTOREQMID=0, OPMODE=DELETE, ANTNUM=2, ANT1CN=0, ANT1SRN=60, ANT1SN=0, ANT1N=R0C, ANT2CN=0, ANT2SRN=60, ANT2SN=0, ANT2N=R0D; MOD SECTOREQM: SECTOREQMID=0, OPMODE=ADD, ANTNUM=2, ANT1CN=0, ANT1SRN=60, ANT1SN=0, ANT1N=R0C, ANTTYPE1=RXTX_MODE, ANT2CN=0, ANT2SRN=60, ANT2SN=0, ANT2N=R0D, ANTTYPE2=RXTX_MODE; //Changing the number of CRS ports and CRS port mapping. This is a high-risk operation and you are advised to use the following parameter settings when setting up the cell. MOD CELL: LocalCellId=0, CrsPortNum=CRS_PORT_4, TxRxMode=4T4R, CrsPortMap=NOT_CFG; //Setting the maximum number of MIMO layers MOD CELLDLSCHALGO: LocalCellId=0,MaxMimoRankPara=SW_MAX_SM_RANK_2; //Setting a fixed transmission mode for the cell MOD CELLMIMOPARACFG: LocalCellId=0,MimoAdaptiveSwitch=NO_ADAPTIVE,FixedMimoMode=TM4,InitialMimoType=ADA PTIVE; //Enabling MIMO at a maximum of four four layers for UEs of categories 6 or higher (not category 5) MOD ENODEBALGOSWITCH: COMPATIBILITYCTRLSWITCH=Tm3Tm4Max4LayerCtrlSwitch-1; //Activating cell 0 ACT CELL: LocalCellId=0;
Optimization Command Examples //Turning on switches related to CQI reporting optimization MOD CELLCQIADAPTIVECFG: LocalCellId=x, CqiPeriodAdaptive=ON, HoAperiodicCqiCfgSwitch=ON,SimulAckNackAndCqiSwitch=ON; MOD CELLALGOSWITCH: LocalCellId=0, DlSchSwitch=AperiodicCqiTrigOptSwitch-1; //Turning on the ApCqiAndAckAbnCtrlSwitch MOD ENODEBALGOSWITCH: CompatibilityCtrlSwitch=ApCqiAndAckAbnCtrlSwitch-1;
5.6.4.1.3 Using the CME For detailed operations, see CME-based Feature Configuration.
5.6.4.2 Verification and Monitoring Activation Verification Use the counters listed in Table 5-17 to monitor downlink MIMO with transmission modes adaptively configured. If any counter has a non-zero value, downlink 4x2 MIMO has taken effect.
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Table 5-17 5 -17 Counters used to monitor downlink MIMO with transmission modes adaptively configured
Counter ID
Counter Name
1526727391 L.ChMeas.MIMO.PR B.CL.Rank1
Counter Description
Corresponding Feature
Total number of physical resource blocks (PRBs) used for rank 1 transmission in downlink closed-loop MIMO
DL 2x2 MIMO
1526727392 L.ChMeas.MIMO.PR B.CL.Rank2
Total number of PRBs used for rank 2 transmission in downlink closed-loop MIMO
1526727393 L.ChMeas.MIMO.PR B.OL.Rank1
Total number of PRBs used for rank 1 transmission in downlink open-loop MIMO
1526727394 L.ChMeas.MIMO.PR B.OL.Rank2
Total number of PRBs used for rank 2 transmission in
DL 4x2 MIMO DL 4x4 MIMO
downlink open-loop MIMO
Network Monitoring None
5.7 DL 4x4 MIMO 5.7.1 Principles Downlink 4x4 MIMO can be used only in cells configured with at least four CRS ports, and only for 4R UEs. Figure 5-7 shows downlink 4x4 MIMO. Figure 5-7 Downlink 4x4 MIMO
5 -18 lists the parameters used for this feature. Table 5-18 Issue 01 (2019-06-06)
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Table 5-18 5 -18 Parameter used for downlink 4x4 MIMO
Parameter Name CRS Port Number
Maximum number of MIMO layers MIMO Adaptive Switch
Parameter ID
Setting Notes
Cell.CrsPortNum
Set this parameter to CRS_PORT_4.
CellDlschAlgo. MaxMimoR MaxMimoR ankPara
Set this parameter to SW_MAX_SM_RANK_4 .
CellMimoParaCfg. MimoA MimoA daptiveSwitch
Set this parameter to CL_ADAPTIVE.
Downlink 4x4 MIMO supports scheduling of a maximum of four layers. If the UE category is 6 or higher (excluding 8 and 14), the maximum number of layers in TM3 or TM4 is controlled by the Tm3Tm4Max4LayerCtrlSwitch option of the ENodeBAlgoSwitch.CompatibilityCtrlSwitch parameter: l
If this option is selected, a maximum of four layers can be scheduled (that is, ranks 1 to 4 are supported).
l
If this option is deselected, a maximum of two layers can be scheduled (that is, ranks 1 and 2 are supported).
5.7.2 Network Analysis 5.7.2.1 Benefits Downlink 4x4 MIMO increases the downlink peak throughput by throughput by approximately 100% compared with downlink 2x2 MIMO. Table 5-19 5 -19 describes the other improvements over downlink 2x2 MIMO. Table 5-19 5 -19 (FDD) Improvements of downlink 4x4 MIMO over downlink 2x2 MIMO
Transmission Mode
Average Downlink Throughput
Downlink Edge Throughput
Description
Open-loop
Increases by 20% to 60%.
Increases by 30% to 70%.
A single UE far away from the cell center will experience high gains.
Closed-loop
Increases by 50% to 90%.
Increases by 50% to 120%
An entire cell that accommodates many UEs far away from the cell center will experience high gains.
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Table 5-20 5 -20 (TDD) Improvements of downlink 4x4 MIMO over downlink 2x2 MIMO
Transmission Mode
Average Downlink Throughput
Description
TM4
Increases by 20% to 60%.
The better the channel quality, the higher the gain. The higher the proportion of 4R UEs, the higher the gain.
Downlink 4x4 MIMO requires that the feeders between physical antennas and RRUs be of the same type, the feeders be shorter than 75 m, and the difference in length between the feeders be less than 1 m.
5.7.2.2 Impacts Network Impacts For FDD, there is no impact.
Function Impacts RAT
Function Name
Function Switch
FDD
DL 256QAM
Dl256Qam Modulation Schemes Switch option of the CellAlgoSw itch. Dl256 Dl256 QamAlgoS witch parameter
TDD
Reference
Description A UE that supports both downlink 4x4 MIMO and 256QAM may not meet the requirements for 256QAM after entering 4x4 MIMO mode. As a result, 256QAM may offer lower or even no gains.
5.7.3 Requirements 5.7.3.1 Licenses RAT
Feature ID
Feature Name
Model
Sales Unit
FDD
LOFD-001001
DL 2x2 MIMO
LT1S0D2I2O00
Per Cell
FDD
LOFD-001003
DL 4x2 MIMO
LT1S0D4I2O00
Per Cell
FDD
LOFD-001060
DL 4x4 MIMO
LT1S0DMIMO 00
Per Cell
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In addition to feature licenses, capacity licenses are required for MIMO. Each BBP is licensed by default to provide two baseband TX channels channels and two baseband RX channels for each each cell. Each RF module is licensed by default to provide two RF TX channels and two RF RX channels. For details, see License see License Control Control Item Lists (FDD). (FDD).
5.7.3.2 Software Before activating this function, ensure that its prerequisite functions have been activated and mutually exclusive functions have been deactivated. For detailed operations, see the relevant feature documents.
Prerequisite Functions None
Mutually Exclusive Functions RAT
Function Name
Function Switch
Reference
FDD
None
None
None
5.7.3.3 Hardware Base Station Models This function requires 3900 or 5900 series base stations.
Boards This function requires 4T BBPs.
RF Modules No requirements
5.7.3.4 Networking (FDD) In FDD, adjust antennas for 4T4R in the following scenarios: l
Reducing the antenna installation space Replace the original separated antennas with an integrated antenna, as shown in Figure 5-8. When using an integrated antenna for cells 1 and 2 in state 1, adjust the downtilt angles and azimuths, making them consistent between the cells.
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Figure 5-8 Reconstruction for reducing the antenna installation space
l
Utilizing the original antennas When only two antenna ports are assigned to the original cells, use two more antenna ports for the new 4T4R cell, cell, as shown in Figure 5-9. Note the following regarding regarding state 3:
–
Case 1 (each 2T2R cell is changed to a 4T4R cell) Adjust the antenna downtilt angles of at least one cell. The downtilt angles must be
–
consistent between the two cells so that the signals of all antennas can be combined. Case 2 (cell 2 is changed from 2T4R to 4T4R) Adjust the antenna downtilt angles of cell 2 to the same direction so that tthe he 4T effects can be ensured.
Figure 5-9 Reconstruction for utilizing the original antennas
The differences in gains when moving between the different states in Figure 5-8 and Figure 5-9 are as follows: Issue 01 (2019-06-06)
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From state 1 to state 2, there may be no gains or even performance loss during the adjustment of downtilt angles and azimuths. To achieve an overall improvement on 2T2R, ensure that the basic performance does not deteriorate during the adjustment.
l
From state 2 to state 3, there will be gains after 4T4R is deployed.
5.7.3.5 Others UEs must comply with 3GPP Release 10 or later and support 4R. To achieve stable benefits from closed-loop MIMO, it is recommended that RRU ports and antenna ports be connected using jumpers (or feeders) with the same length, regardless of whether integrated or combined RRUs are used. If one or more jumpers (or feeders) are connected to a combiner, it is required that the difference in delay between channels induced 5 -21. by the combiner and jumpers jumpers (or feeders) meet the requirements requirements in Table 5-21 Table 5-21 5 -21 Requirements for inter-channel inter-channel delay difference difference
System Bandwidth
Requirements for Inter-Channel Delay Difference
20 MHz
Less than 10 ns
15 MHz
Less than 13.3 ns
10 MHz
Less than 20 ns
5 MHz
Less than 40 ns
≤ 3 MHz
Less than 65 ns
If the inter-channel delay difference does not meet the preceding requirements, there will be a significant deterioration in the performance of downlink 4x4 MIMO in closed-loop mode. The larger the delay difference, the higher the degree of deterioration. Assume that the bandwidth is 10 MHz and inter-channel inter-channel delay delay difference difference is introduced at ports ports D and B. Then, the delay difference affects performance, performance, as listed in Table 5-22. Table 5-22 5 -22 Impact of inter-channel delay difference on performance
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Inter-Channel Delay Difference
Average Throughput (Mbit/s)
Average SINR (dB)
Proportion of Rank 2 Transmissions
Throughput Change
4x4 MIMO (baseline)
29.78
11.41
70.87%
-
4x4 MIMO + 10 ns
29.78
11.22
69.64%
Remains unchanged
4x4 MIMO + 20 ns
28.59
11.06
61.31%
-4.00%
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Inter-Channel Delay Difference
Average Throughput (Mbit/s)
Average SINR (dB)
Proportion of Rank 2 Transmissions
Throughput Change
4x4 MIMO + 30 ns
23.75
11.21
34.86%
-20.25%
4x4 MIMO + 50 ns
22.37
11.34
33.96%
-24.88%
The preceding test results are reference only for estimating the impact of inter-channel delay difference on 4T performance. The results will change with test conditions. If combiners are required in engineering, note the following: l
l
It is recommended that other channels be connected to the same types of combiners to ensure that the inter-channel delay difference meets the requirements in the preceding table. However, this solution increases component costs and engineering costs. If other channels are not connected to combiners, you need to measure the delay induced by the existing combiner, combiner, estimate the delay difference difference caused caused by the difference difference between jumpers (and feeders), feeders), and use MML commands commands to provide delay compensation compensation for other channels.. This solut channels solution ion requires a VNA for combiner delay measurement.
5.7.4 Operation and Maintenance 5.7.4.1 Data Configuration 5.7.4.1.1 Data Preparation In actual applications, uplink MIMO and downlink MIMO are configured together together.. Therefore, both uplink and downlink parameters parameters are listed here here while other cell-setup cell-setup parameters are are not. 5 -23 describes the parameters used for activation using the setup of a 4T4R cell as an Table 5-23 example. Table 5-23 5 -23 Parameters used for activation
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RAT
Parameter Name
Parameter ID
Option
Setting Notes
FDD
Cell transmission and reception mode
Cell.TxRxMod e
None
Set this parameter to 4T4R .
FDD
CRS Port Number
Cell.CrsPortNu None m
Set this parameter to CRS_PORT_4.
FDD
CRSMapping Antenna Port
Cell.CrsPortM ap
None
Set this parameter to NOT_CFG .
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RAT
Parameter Name
Parameter ID
Option
Setting Notes
FDD
Maximum number of MIMO layers
CellDlschAlgo. MaxMimoRan kPara
None
Set this parameter to SW_MAX_SM_RANK _4.
FDD
Compatibility Control Switch
ENodeBAlgoS witch.Compati bilityCtrlSwitch
Tm3Tm4Max4 LayerCtrlSwitc h
Select this option.
5.7.4.1.2 Using MML Commands (FDD)
Activation Command Examples Change 2T2R and 2T4R cells to 4T4R cells. l
Changing a 2T2R cell to a 4T4R cell
//Deactivating cell 0 DEA CELL: LocalCellId=0; //Modifying sector and sector equipment configurations MOD SECTOR: SECTORID=0, OPMODE=ADD, ANTNUM=2, ANT1CN=0, ANT1SRN=60, ANT1SN=0, ANT1N=R0C, ANT2CN=0, ANT2SRN=60, ANT2SN=0, ANT2N=R0D; MOD SECTOREQM: SECTOREQMID=0, OPMODE=ADD, ANTNUM=2, ANT1CN=0, ANT1SRN=60, ANT1SN=0, ANT1N=R0C, ANTTYPE1=RXTX_MODE, ANT2CN=0, ANT2SRN=60, ANT2SN=0, ANT2N=R0D, ANTTYPE2=RXTX_MODE; //Changing the number of CRS ports and CRS port mapping. This is a high-risk operation and you are advised to use the following parameter settings when setting up the cell. MOD CELL: LocalCellId=0, CrsPortNum=CRS_PORT_4, TxRxMode=4T4R, CrsPortMap=NOT_CFG; //Setting the maximum number of MIMO layers MOD CELLDLSCHALGO: LocalCellId=0,MaxMimoRankPara=SW_MAX_SM_RANK_4; //Setting a fixed transmission mode for the cell MOD CELLMIMOPARACFG: LocalCellId=0,MimoAdaptiveSwitch=NO_ADAPTIVE,FixedMimoMode=TM4,InitialMimoType=ADA PTIVE; //Enabling MIMO at a maximum of four layers for UEs of categories 6 or higher (not category 5) MOD ENODEBALGOSWITCH: COMPATIBILITYCTRLSWITCH=Tm3Tm4Max4LayerCtrlSwitch-1; //Activating cell 0 ACT CELL: LocalCellId=0; l
Changing a 2T4R cell to a 4T4R cell
//Deactivating cell 0 DEA CELL: LocalCellId=0; //Modifying sector and sector equipment configurations MOD SECTOREQM: SECTOREQMID=0, OPMODE=DELETE, ANTNUM=2, ANT1CN=0, ANT1SRN=60, ANT1SN=0, ANT1N=R0C, ANT2CN=0, ANT2SRN=60, ANT2SN=0, ANT2N=R0D; MOD SECTOREQM: SECTOREQMID=0, OPMODE=ADD, ANTNUM=2, ANT1CN=0, ANT1SRN=60, ANT1SN=0, ANT1N=R0C, ANTTYPE1=RXTX_MODE, ANT2CN=0, ANT2SRN=60, ANT2SN=0, ANT2N=R0D, ANTTYPE2=RXTX_MODE; //Changing theyou number CRS ports and CRS port mapping. Thissettings is a high-risk operation and are of advised to use the following parameter when setting up the cell.
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MOD CELL: LocalCellId=0, CrsPortNum=CRS_PORT_4, TxRxMode=4T4R, CrsPortMap=NOT_CFG; //Setting the maximum number of MIMO layers MOD CELLDLSCHALGO: LocalCellId=0,MaxMimoRankPara=SW_MAX_SM_RANK_4; //Setting a fixed transmission mode for the cell MOD CELLMIMOPARACFG: LocalCellId=0,MimoAdaptiveSwitch=NO_ADAPTIVE,FixedMimoMode=TM4,InitialMimoType=ADA PTIVE; //Enabling MIMO at a maximum of four layers for UEs of categories 6 or higher (not category 5) MOD ENODEBALGOSWITCH: COMPATIBILITYCTRLSWITCH=Tm3Tm4Max4LayerCtrlSwitch-1; //Activating cell 0 ACT CELL: LocalCellId=0;
Optimization Command Examples //Turning on switches related to CQI reporting optimization MOD CELLCQIADAPTIVECFG: LocalCellId=x, CqiPeriodAdaptive=ON, HoAperiodicCqiCfgSwitch=ON,SimulAckNackAndCqiSwitch=ON; MOD CELLALGOSWITCH: LocalCellId=0, DlSchSwitch=AperiodicCqiTrigOptSwitch-1; //Turning on the ApCqiAndAckAbnCtrlSwitch MOD ENODEBALGOSWITCH: CompatibilityCtrlSwitch=ApCqiAndAckAbnCtrlSwitch-1;
5.7.4.1.3 Using the CME For detailed operations, see CME-based Feature Configuration.
5.7.4.2 Verification and Monitoring Activation Verification 5 -24 to monitor downlink MIMO with transmission modes Use the counters listed in Table 5-24 adaptively configured. If any counter related to rank 3 or 4 has a non-zero value, downlink 4x4 MIMO has taken effect. Table 5-24 5 -24 Counters used to monitor downlink MIMO with transmission modes adaptively configured
Counter ID
Counter Name
1526727391 L.ChMeas.MIMO.PR B.CL.Rank1
Corresponding Feature
Total number of physical resource blocks (PRBs) used for rank 1 transmission in downlink closed-loop MIMO
DL 2x2 MIMO
1526727392 L.ChMeas.MIMO.PR B.CL.Rank2
Total number of PRBs used for rank 2 transmission in downlink closed-loop MIMO
1526727393 L.ChMeas.MIMO.PR
Total number of PRBs used
B.OL.Rank1
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Counter Description
DL 4x2 MIMO DL 4x4 MIMO
for rank 1 transmission in downlink open-loop MIMO
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Counter ID
5 Downlink MIMO
Counter Name
Counter Description
1526727394 L.ChMeas.MIMO.PR B.OL.Rank2
Total number of PRBs used for rank 2 transmission in downlink open-loop MIMO
1526728174 L.ChMeas.MIMO.PR B.CL.Rank3
Total number of PRBs used for rank 3 transmission in downlink closed-loop MIMO
1526728175 L.ChMeas.MIMO.PR B.CL.Rank4
Total number of PRBs used for rank 4 transmission in downlink closed-loop MIMO
1526728176 L.ChMeas.MIMO.PR B.OL.Rank3
Total number of PRBs used for rank 3 transmission in downlink open-loop MIMO
1526728177 L.ChMeas.MIMO.PR B.OL.Rank4
Total number of PRBs used for rank 4 transmission in downlink open-loop MIMO
Corresponding Feature
DL 4x4 MIMO
Network Monitoring None
5.8 TX Channel Calibration If the delay between TX signals increases, the performance of closed-loop MIMO deteriorates. If two RRUs are combined to serve a cell, TX channel calibration must be used to align the TX channels of the t he RRUs. TX channel calibration does not require the hardware modification of RRUs and physical antennas but requires software upgrade. It depends on the coupling of air interface signals between physical antennas. antennas. In addition, it has the following requirements: l
RRU: Combined 2T2R RRUs or 2T4R RRUs (FDD) work in the same frequency band and connect to the same BBP. BBP. In the current version, TX channel calibration can be used on combined RRU3942 modules.
l
BBP: The BBP must be LBBPd, UBBPd, or UBBPe.
l
Physical antenna: An integrated antenna with four ports is recommended. Two Two physical antennas each with two ports can also be used, with a horizontal spacing of not greater than 5 m. Physical antennas cannot be installed vertically.
l
Cell: The cell is a 4T4R cell, and the Cell. MultiRruCellFlag MultiRruCellFlag parameter parameter is set to BOOLEAN_FALSE. The cell cannot be a 2T2R, 2T4R, or multi-RRU cell.
l
Networking mode: RRU channels channels and physical antennas antennas are connected connected in non-crossconnection mode, as shown in Figure 5-10. CPRI ports can use the star or cascaded topology.
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TX channel calibration cannot be used on combined 1T2R RRUs. Therefore, open-loop 2x2 MIMO is recommended but closed-loop 2x2 MIMO is not recommended on commercial networks.
Figure 5-10 Example of topology for TX channel calibration
TX channel calibration is controlled by the RruJointCalParaCfg.TxChnCalSwitch parameter: l
When the RruJointCalParaCfg.TxChnCalSwitch parameter is set to OFF: TX channel calibration is disabled, and the throughput of closed-loop 4x2 or 4x4 MIMO cannot be ensured.
l
When the RruJointCalParaCfg.TxChnCalSwitch parameter is set to ON: The first TX channel calibration starts after a cell is set up. Subsequent TX channel calibration is performed periodically. The throughput of closed-loop 4x2 or 4x4 MIMO increases by up to 30%. During the calibration (lasting for less than 1s), the downlink throughput slightly decreases (by less than 5%) and the uplink throughput of cell edge users (CEUs) also decreases. The RruJointCalParaCfg.TxChnCalTime and RruJointCalParaCfg.TxChnCalPeriod parameters specify specify the local time and period period of TX channel calibration, calibration, respectively. respectively.
The DSP CELLCALIBRATION command can be used to query the calibration time, type, and effect of the last 10 TX channel calibrations.
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5.9 Downlink-Only Module Channel Calibration (FDD) According to protocols, certain LTE LTE bands such as Band 29 and Band 32 include only downlink bands but no uplink bands. Cells served by RF modules working in these bands (such as 4T0R RF modules) have only downlink functions but no uplink functions. When closed-loop MIMO is used for 4T cells served by 4T0R RF modules, downlink channel calibration needs to be supported to implement strict alignment of TX channels between RF modules and improve downlink performance. To implement downlink-only module channel calibration, the following conditions must be met: l
BBPs must be UBBPe.
l
Cells must be 4T4R cells and the Cell. MultiRruCellFlag MultiRruCellFlag parameter parameter is set to BOOLEAN_FALSE.
Downlink-only module channel calibration is controlled by the RruJointCalParaCfg. AauPassivePortCalibPeriod AauPassivePortCalibPeriod parameter. parameter. l
When this parameter is set to 0, downlink-only module channel calibration does not take effect and the average downlink cell throughput of downlink 4x2 and 4x4 closed-loop MIMO is not guaranteed.
l
When this parameter is set to a non-zero value, downlink-only module channel calibration takes effect. The eNodeB periodically calibrates TX channels; the period is specified by this parameter. parameter. After downlink-only module channel calibration is enabled, the average downlink cell throughput of downlink 4x2 and 4x4 closed-loop MIMO can increase by up to 10%.
The DSP CELLCALIBRATION command can be used to query the calibration time, type (initial or periodic calibration), and result of the last 10 channel calibrations.
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6
Uplink MIMO
Uplink MIMO is a multiple-antenna reception technology of the eNodeB. It is used to provide the following solutions: receive diversity, diversity, multi-user MIMO (MU-MIMO), and single-user MIMO (SU-MIMO). Figure 6-1 illustrates these solutions using uplink 2-antenna reception as an example. Figure 6-1 Uplink 2-antenna reception
6.1 UL 2-Antenna Receive Diversity 6.1.1 Principles Uplink 2-antenna receive diversity requires a cell to have at least two RX channels. The two RX channels receive the same signal of a UE from different directions to improve reception quality,, as shown in Figure 6-2. quality
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Figure 6-2 Uplink 2-antenna receive diversity
Uplink 2-antenna receive diversity can be deployed in 1T2R or 2T2R cells. The numbers of TX and RX channels provided by the hardware must be greater than or equal to the numbers of TX and RX channels in the cell. The TX/RX mode of a cell is specified by the Cell.TxRxMode parameter.
6.1.1.1 1T2R Cell A 1T2R cell is set up on a 1T2R sector. A 1T2R sector can be served by a 1T2R RRU. This RRU is connected to the baseband unit (BBU) through optical fibers and to the physical antenna through feeders, as shown in Figure 6-3. Figure 6-3 1T2R sector deployment
A 1T2R sector can also be served by a 2T2R or higher-order RRU: l
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6 Uplink MIMO
If a 2T4R or 4T4R RRU is used, the 1T2R sector can be set up only on channels A and C or channels B and D.
6.1.1.2 2T2R Cell Integrated RRU A 2T2R cell is set up on a 2T2R sector. A 2T2R sector can be served by a 2T2R RRU. Figure 6-4 illustrates the deployment. Figure 6-4 2T2R sector deployment (with an integrated RRU)
A 2T2R sector can also be served by a 2T4R or higher-order RRU: l
If a 2T4R or higher-order RRU is used, the redundant TX or RX channels can be used for other sectors.
l
If a 2T4R RRU is used, the 2T2R sector can be set up only on channels A and B.
l
If a 4T4R RRU is used, it is recommended that the 2T2R sector be set up on channels A and C, channels B and D, or channels A and B. All channels involved must work in TX/RX mode.
Combined RRUs A 2T2R sector can be served by two 1T2R RRUs. Figure 6-5 illustrates the deployment.
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Figure 6-5 2T2R sector deployment (with combined RRUs)
6.1.2 Network Analysis 6.1.2.1 Benefits Uplink 2-antenna receive diversity is a basic feature. Its benefits are not detailed here.
6.1.2.2 Impacts Network Impacts None
Function Impacts None
6.1.3 Requirements 6.1.3.1 Licenses The TX/RX capabilities of cells depend on the TX/RX capabilities of baseband processing units (BBPs). For the TX/RX capabilities of BBPs, see Hardwar see Hardwaree Description in Description in product documentation. Each BBP is licensed by default to provide two baseband TX channels and two baseband RX channels for each cell. Each RF module is licensed by default to provide two RF TX channels and two RF RX channels. Therefore, 2T2R cell setup does not require additional licenses. Issue 01 (2019-06-06)
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6.1.3.2 Software Prerequisite Functions None
Mutually Exclusive Functions None
6.1.3.3 Hardware Base Station Models No requirements
Boards No requirements
RF Modules No requirements
6.1.3.4 Others None
6.1.4 Operation and Maintenance 6.1.4.1 Data Configuration 6.1.4.1.1 Data Preparation Uplink MIMO and downlink MIMO are configured together in actual applications. Therefore, both uplink and downlink parameters parameters are listed here here while other parameters parameters for cell setup are not. Table 6-1 describes the parameters used for activation using the setup of a 2T2R cell as an example. Table 6-1 6 -1 Parameters used for activation
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RAT
Parameter Name
Parameter ID
Setting Notes
FDD
Cell transmission and reception mode
Cell.TxRxMode
Set this parameter to 2T2R .
FDD
CRS Port Number Cell.CrsPortNum
Set this parameter to CRS_PORT_2.
FDD
Maximum number of MIMO layers
Set this parameter to SW_MAX_SM_RANK_2 .
CellDlschAlgo. Max Max MimoRankPara
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6.1.4.1.2 Using MML Commands (FDD)
Activation Command Examples Set up a 2T2R cell. //Adding a sector and a set of sector equipment after adding an RRU ADD SECTOR: SECTORID=0, ANTNUM=2, ANT1CN=0, ANT1SRN=60, ANT1SN=0, ANT1N=R0A, ANT2CN=0, ANT2SRN=60, ANT2SN=0, ANT2N=R0B, CREATESECTOREQM=TRUE, SECTOREQMID=0; ADD SECTOREQM: SECTOREQMID=0, SECTORID=0, ANTCFGMODE=ANTENNAPORT, ANTNUM=2, ANT1CN=0, ANT1SRN=60, ANT1SN=0, ANT1N=R0A, ANTTYPE1=RXTX_MODE, ANT2CN=0, ANT2SRN=60, ANT2SN=0, ANT2N=R0B, ANTTYPE2=RXTX_MODE; //Adding an FDD cell ADD CELL: LocalCellId=0, CellName="cell0", FreqBand=12, UlEarfcnCfgInd=NOT_CFG, DlEarfcn=5020, UlBandWidth=CELL_BW_N50, DlBandWidth=CELL_BW_N50, CellId=0, PhyCellId=0, FddTddInd=CELL_FDD, RootSequenceIdx=0, CustomizedBandWidthCfgInd=NOT_CFG, EmergencyAreaIdCfgInd=NOT_CFG, UePowerMaxCfgInd=NOT_CFG, MultiRruCellFlag=BOOLEAN_FALSE, TxRxMode=2T2R,CrsPortNum=CRS_PORT_2; //Adding cell sector equipment ADD EUCELLSECTOREQM: LocalCellId=0, SectorEqmId=0; //Adding an operator for the cell ADD CELLOP: LocalCellId=0, TrackingAreaId=0; //Setting the maximum number of MIMO layers MOD CELLDLSCHALGO: LocalCellId=0, MaxMimoRankPara=SW_MAX_SM_RANK_2; //Activating cell 0 ACT CELL: LocalCellId=0;
Optimization Command Examples N/A
6.1.4.1.3 Using the CME For detailed operations, see CME-based Feature Configuration.
6.1.4.2 Verification and Monitoring Activation Verification Step 1 Start a received signal strength indicator (RSSI) monitoring task on the U2020 client to monitor the RSSIs of antennas.
Item for Monitoring
Unit
Value Range
Description
Antenna y Antenna y R RS SSI
dBm
-140 to -50
Antenna y y RSSI RSSI in the system bandwidth
Step 2 Check the monitoring results. Issue 01 (2019-06-06)
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Feature
Successful Result
UL 22-Ante Antenn nnaa R Reeceive eive Dive ivers rsit ity y
The The R RS SSIs of ant nteenna nnas 0 and 1 aare re not not N/A.
UL 44-Ante Antenn nnaa R Reeceive eive Dive ivers rsit ity y
The The R RS SSIs of ant nteenna nnas 0 to 3 are are not not N/A.
----End
Network Monitoring Monitor the counters listed in Table 6-2 and calculate the uplink cell throughput. The more the antennas for a cell, the higher the cell throughput, under the same conditions such as the same cell, bandwidth, and total transmit power. Table 6-2 6 -2 Counters related to receive diversity
Counter ID
Counter Name
1526728259
L.Thrp.bits.UL
1526728998
L.Thrp.Time.Cell.UL.HighPrecision
Monitor the counters listed in Table 6-3 to check the status of connections between antennas and RRU ports. If the average RSSI value of antenna x antenna x is is much less than those of the other antennas, antenna x antenna x is is not connected to an RRU port. In Figure 6-6, antennas 2 and 3 are not connected to RRU ports. Table 6-3 6 -3 Counters related to average RSSI values
Counter ID
Counter Name
1526737656 through 1526737663
L.CellSectorEQUIP.UL.RSSI.Avg.Ant0 through L.CellSectorEQUIP.UL.RSSI.Avg.Ant7
Figure 6-6 Example of average RSSI values
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6.2 UL 4-Antenna Receive Diversity 6.2.1 Principles Uplink 4-antenna receive diversity requires that a cell have at least four RX channels. The four RX channels receive the same signal of a UE from different directions to improve reception quality, quality, as shown in Figure 6-7. Figure 6-7 Uplink 4-antenna receive diversity
Uplink 4-antenna 4-antenna receive receive diversity can be deployed in 2T4R or 4T4R cells. The numbers of TX and RX channels provided by the hardware must be greater than or equal to the numbers of TX and RX channels in the cell. The TX/RX mode of a cell is specified by the Cell.TxRxMode parameter.
6.2.1.1 2T4R Cell (FDD) Integrated RRU A 2T4R cell is set up on a 2T4R sector. A 2T4R sector can be served by a 2T4R RRU. Figure 6-8 illustrates the deployment.
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Figure 6-8 2T4R sector deployment (with an integrated RRU)
A 2T4R sector can also be served by a 4T4R RRU. It is recommended that channels A and B work in TX/RX mode while channels C and D work in RX mode.
Combined RRUs A 2T4R sector can be served by two 1T2R RRUs. Figure 6-9 illustrates the deployment. RRU s) Figure 6-9 2T4R sector deployment (with combined 1T2R RRUs)
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A 2T4R sector can be served by two 2T2R RRUs. Figure 6-10 illustrates the deployment. In this case, RRU 1 works in 2T2R mode and RRU 2 works in 0T2R mode. Compared with 1T2R+1T2R, this work mode can prevent downlink throughput from decreasing due to inconsistent feeder lengths, losses, or other factors. Figure 6-10 2T4R sector deployment (with combined 2T2R RRUs)
6.2.1.2 4T4R Cell Integrated RRU A 4T4R cell is set up on a 4T4R sector. A 4T4R sector can be served by a 4T4R RRU. Figure 6-11 illustrates the deployment.
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Figure 6-11 4T4R sector deployment (with an integrated RRU)
Combined RRUs A 4T4R sector can be served by two 2T2R RRUs. Figure 6-12 illustrates the deployment. Figure 6-12 4T4R sector deployment (with combined 2T2R RRUs)
A 4T4R sector can be served by two 2T4R RRUs. Figure 6-13 illustrates the deployment. Issue 01 (2019-06-06)
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Figure 6-13 4T4R sector deployment (with combined 2T4R RRUs)
6.2.2 Network Analysis 6.2.2.1 Benefits 6 -4 describes the benefits offered by uplink 4-antenna receive diversity compared with Table 6-4 uplink 2-antenna receive diversity for FDD. Table 6-4 6 -4 Benefits offered by uplink 4-antenna receive diversity
Scenario
Improvement over Uplink 2-
Description
Antenna Receive Diversity Weak coverage, medium interference, or high interference
Increases the Cell Uplink Average Throughput by 30% to 65%. Increases the uplink edge throughput by 50% to 170%.
Small intersite distance and low interference
Increases the Cell Uplink Average Throughput by up to 30%.
None
Improves the uplink cell coverage coverage by 3
For a single UE, the farther away it is from the cell center, center, the higher the gains are. For a cell, the more CEUs it accommodates, the higher the gains are.
Increases the uplink edge throughput by up to 60%. None
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Uplink 4-antenna receive diversity requires that the feeders between physical antennas and RRUs be of the same type and the difference in length between the feeders be less than 1 m. Otherwise, the gains may be reduced. For NB-IoT, NB-IoT, uplink 4-antenna receive diversity delivers better uplink performance than uplink 2-antenna receive diversity: l l
Increases the average uplink cell throughput by 10% to 50%. Offers higher diversity gains and array gains, and improves coverage by 1 dB to 3 dB.
l
Reduces the number of occupied uplink subcarriers and the uplink subcarrier usage.
The preceding benefits are affected by interference. The following uses the average uplink cell throughput as an example: l
When the interference is weak, there is a significant increase in the average uplink cell throughput. In white noise scenarios, there is the most significant increase in the average uplink cell throughput.
l
When the interference is strong, there is a small increase in the average uplink cell throughput.
6.2.2.2 Impacts Network Impacts For FDD, there are no network impacts. For NB-IoT, NB-IoT, the service drop boundary is expanded as the coverage is improved by up to 3 dB in 4-antenna reception compared with 2-antenna reception. Accordingly, the interference with CEUs also increases. To avoid the poor channel quality of CEUs, prevent overshoot coverage during network planning. In LTE in-band deployment, when channel calibration is performed for combined LTE FDD RRUs: l
l
If the NB-IoT cell is activated, channel calibration affects NB-IoT services. The BERs of NPDCCH and NPDSCH NPDSCH increase by no more more than 10%. In other situations, channel calibration does not affect NB-IoT services.
Function Impacts None
6.2.3 Requirements 6.2.3.1 Licenses The following are license requirements.
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RAT
Feature ID
Feature Name
Model
Sales Unit
FDD
LOFD-001001
DL 2x2 MIMO
LT1S0D2I2O00
Per Cell
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RAT
Feature ID
Feature Name
Model
Sales Unit
FDD
LOFD-001005
UL 4-Antenna Receive Diversity
LT1S0U4ARD00
Per Cell
NB-IoT
MLOFD-121202
UL 4-Antenna
ML1S0U4ARD00
Per C Ceell
Receive Diversity In addition to feature licenses, capacity licenses are required for MIMO. Each BBP is licensed by default to provide two baseband TX channels channels and two baseband RX channels for each each cell. Each RF module is licensed by default to provide two RF TX channels and two RF RX channels. For details, see License see License Control Control Item Lists (FDD). (FDD).
6.2.3.2 Software Prerequisite Functions None
Mutually Exclusive Functions None
6.2.3.3 Hardware Base Station Models For FDD, the following base stations are compatible with this function: l
3900 and 5900 series base stations
For NB-IoT, NB-IoT, 3900 and 5900 series base stations are compatible with this function.
Boards For FDD, BBPs must support 4R. For FDD, BBPs must be UBBPd4/UBBPd5/UBBPd6 or UBBPe2/UBBPe4/UBBPe5/ UBBPe6/UBBPg. For NB-IoT, BBPs must be UBBPe2/UBBPe4/UBBPe5/UBBPe6/UBBPe8/UBBPe9/ UBBPe2/UBBPe4/UBBPe5/UBBPe6/UBBPe8/UBBPe9/ UBBPd9/UBBPe10/UBBPe11/UBBPe12/UBBPg.
RF Modules Some RF modules cannot be combined to serve a 2T4R cell. These modules are RRU3201, RRU3203, RRU3808, and LRFU. If two MRFUd modules are combined, the recommended mode is 2T2R+0T2R. Issue 01 (2019-06-06)
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Cells If two antennas are combined, both uplink MIMO and downlink MIMO require that the antennas have the same azimuth and downtilt angle.
6.2.3.4 Others If two physical physical antennas antennas are combined to implement uplink 4-antenna receive diversity, the antennas must meet the following conditions to ensure uplink performance: l
The azimuths and downtilt angles of the antennas must be consistent.
l
The spacing between the antennas must meet isolation requirements.
l
The lengths and losses of feeders between the antennas and RRUs must be consistent.
6.2.4 Operation and Maintenance 6.2.4.1 Data Configuration 6.2.4.1.1 Data Preparation Uplink MIMO and downlink MIMO are configured together in actual applications. Therefore, both uplink and downlink parameters parameters are listed here here while other parameters parameters for cell setup are not. For FDD, the following uses a 4T4R cell as an example to describe data preparation for activation. Table 6-5 describes the related parameters. Table 6-5 6 -5 Parameters used for activation
RAT
Parameter Name
Parameter ID
Option
Setting Notes
FDD
Cell transmission and reception mode
Cell.TxRxMod e
None
Set this parameter to 4T4R .
FDD
CRS Port Number
Cell.CrsPortNu None m
Set this parameter to CRS_PORT_4.
FDD
CRS Antenna Port Mapping
Cell.CrsPortM ap
None
Set this parameter to NOT_CFG.
FDD
Maximum number of MIMO layers
CellDlschAlgo. MaxMimoRan kPara
None
Set this parameter to SW_MAX_SM_RANK _4.
FDD
Compatibility Control Switch
ENodeBAlgoS witch.Compati bilityCtrlSwitch
Tm3Tm4Max4 LayerCtrlSwitc h
You are advised to select this option.
6 -6 describes the parameters related to NB-IoT. Table 6-6 Issue 01 (2019-06-06)
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Table 6-6 6 -6 NB-IoT parameters used for activation
Parameter Name
Parameter ID
Setting Notes
Local Cell ID
Cell. LocalCellId LocalCellId
-
CRS Port Number Cell.CrsPortNum
Set this parameter based on the number of downlink channels. Set this parameter to CRS_PORT_2 in 2T or 4T mode. Set this parameter to CRS_PORT_1 in 1T mode.
Cell transmission and reception mode
Cell.TxRxMode
Set this parameter to a value consistent with the SECTOR . ANTNUM parameter value. ANTNUM parameter Set this parameter to 1T1R, 1T2R, 2T2R, 2T4R, or 4T4R for NB-IoT.
CRS Antenna Port Mapping
Cell.CrsPortMap
Set this parameter to 4T2P_0101 when the Cell.TxRxMode Cell. TxRxMode parameter is set to 4T4R and the Cell.CrsPortNum parameter is set to CRS_PORT_2. When NB-IoT is deployed in LTE in-band mode: l
l
PRB ID
EuPrbSectorEqm.
If the.CrsPortNum LTE FDD cell parameters and Cell Cell.TxRxMode are set to CRS_PORT_4 and 4T4R , respectively,, then the NB-IoT cell respectively parameters Cell.CrsPortNum and Cell.TxRxMode must be set to CRS_PORT_2 and 4T4R , respectively. If the LTE FDD cell parameters Cell.CrsPortNum and Cell.TxRxMode are set to other values, then the NB-IoT cell parameters Cell.CrsPortNum and Cell.TxRxMode must be set to the same values as the LTE FDD cell parameters.
-
PrbId
Sector Equipment ID
S EuPrbSectorEqm . S ectorEqmId
6.2.4.1.2 Using MML Commands (FDD)
Activation Command Examples Change 2T2R and 2T4R cells to 4T4R cells. l
Changing a 2T2R cell to a 4T4R cell
//Deactivating cell 0 DEA CELL: LocalCellId=0; //Modifying sector and sector equipment configurations
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MOD SECTOR: SECTORID=0, OPMODE=ADD, ANTNUM=2, ANT1CN=0, ANT1SRN=60, ANT1SN=0, ANT1N=R0C, ANT2CN=0, ANT2SRN=60, ANT2SN=0, ANT2N=R0D; MOD SECTOREQM: SECTOREQMID=0, OPMODE=ADD, ANTNUM=2, ANT1CN=0, ANT1SRN=60, ANT1SN=0, ANT1N=R0C, ANTTYPE1=RXTX_MODE, ANT2CN=0, ANT2SRN=60, ANT2SN=0, ANT2N=R0D, ANTTYPE2=RXTX_MODE; //Changing the number of CRS ports and CRS port mapping. This is a high-risk operation and you are advised to use the following parameter settings when setting up the cell. MOD CELL: LocalCellId=0, CrsPortNum=CRS_PORT_4, TxRxMode=4T4R, CrsPortMap=NOT_CFG; //Setting the maximum number of MIMO layers MOD CELLDLSCHALGO: LocalCellId=0,MaxMimoRankPara=SW_MAX_SM_RANK_4; //Enabling MIMO at a maximum of four layers for UEs of categories 6 or higher (not category 5) MOD ENODEBALGOSWITCH: COMPATIBILITYCTRLSWITCH=Tm3Tm4Max4LayerCtrlSwitch-1; //Activating cell 0 ACT CELL: LocalCellId=0; l
Changing a 2T4R cell to a 4T4R cell
//Deactivating cell 0 DEA CELL: LocalCellId=0; //Modifying sector and sector equipment configurations MOD SECTOREQM: SECTOREQMID=0, OPMODE=DELETE, ANTNUM=2, ANT1CN=0, ANT1SRN=60, ANT1SN=0, ANT1N=R0C, ANT2CN=0, ANT2SRN=60, ANT2SN=0, ANT2N=R0D; MOD SECTOREQM: SECTOREQMID=0, OPMODE=ADD, ANTNUM=2, ANT1CN=0, ANT1SRN=60, ANT1SN=0, ANT1N=R0C, ANTTYPE1=RXTX_MODE, ANT2CN=0, ANT2SRN=60, ANT2SN=0, ANT2N=R0D, ANTTYPE2=RXTX_MODE; //Changing the number of CRS ports and CRS port mapping. This is a high-risk operation and you are advised to use the following parameter settings when setting up the cell. MOD CELL: LocalCellId=0, CrsPortNum=CRS_PORT_4, TxRxMode=4T4R, CrsPortMap=NOT_CFG; //Setting the maximum number of MIMO layers MOD CELLDLSCHALGO: LocalCellId=0,MaxMimoRankPara=SW_MAX_SM_RANK_4; //Enabling MIMO at a maximum of four layers for UEs of categories 6 or higher (not category 5) MOD ENODEBALGOSWITCH: COMPATIBILITYCTRLSWITCH=Tm3Tm4Max4LayerCtrlSwitch-1; //Activating cell 0 ACT CELL: LocalCellId=0;
Optimization Command Examples //Turning on switches related to CQI reporting optimization MOD CELLCQIADAPTIVECFG: LocalCellId=x, CqiPeriodAdaptive=ON, HoAperiodicCqiCfgSwitch=ON,SimulAckNackAndCqiSwitch=ON; MOD CELLALGOSWITCH: LocalCellId=0, DlSchSwitch=AperiodicCqiTrigOptSwitch-1; //Turning on the ApCqiAndAckAbnCtrlSwitch MOD ENODEBALGOSWITCH: CompatibilityCtrlSwitch=ApCqiAndAckAbnCtrlSwitch-1;
6.2.4.1.3 Using MML Commands (NB-IoT)
Configuring a 2T4R Cell (Integrated 2T4R RRU) //Adding a sector ADD SECTOR: SECTORID=0,SECNAME="huawei",LOCATIONNAME="huawei",ANTNUM=4,ANT1CN=0,ANT1SRN=60,ANT 1SN=0,ANT1N=R0A,ANT2CN=0,ANT2SRN=60,ANT2SN=0,ANT2N=R0B,ANT3CN=0,ANT3SRN=60,ANT3SN= 0,ANT3N=R0C,ANT4CN=0,ANT4SRN=60,ANT4SN=0,ANT4N=R0D,CREATESECTOREQM=FALSE; //Adding sector equipment ADD SECTOREQM: SECTOREQMID=0, SECTORID=0, ANTCFGMODE=ANTENNAPORT, ANTNUM=4, ANT1CN=0, ANT1SRN=60, ANT1SN=0, ANT1N=R0A, ANTTYPE1=RXTX_MODE, ANT2CN=0,
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ANT2SRN=60, ANT2SN=0, ANT2N=R0B, ANTTYPE2=RXTX_MODE, ANT3CN=0, ANT3SRN=60, ANT3SN=0, ANT3N=R0C, ANTTYPE3=RX_MODE, ANT4CN=0, ANT4SRN=60, ANT4SN=0, ANT4N=R0D, ANTTYPE4=RX_MODE; //Adding a cell ADD CELL: LocalCellId=0, CellName="cell0", NbCellFlag=TRUE, CoverageLevelType=COVERAGE_LEVEL_0-1&COVERAGE_LEVEL_1-1&COVERAGE_LEVEL_2-1, CellId=0, PhyCellId=0, FddTddInd=CELL_FDD, EuCellStandbyMode=ACTIVE, CustomizedBandWidthCfgInd=NOT_CFG, EmergencyAreaIdCfgInd=NOT_CFG, UePowerMaxCfgInd=NOT_CFG, MultiRruCellFlag=BOOLEAN_FALSE, TxRxMode=2T4R; //(Optional) In LTE in-band deployment, adding a PRB for the NB-IoT cell. For example, the frequency band is band 8, the uplink EARFCN is 21511, and the downlink EARFCN is 3590. ADD PRB: LocalCellId=0, PrbId=0, DeployMode=IN_BAND, FreqBand=8, UlEarfcnCfgInd=CFG, UlEarfcn=21511, UlFreqOffset=NEG_2, DlEarfcn=3590, DlFreqOffset=POS_0, LteCellId=1; //Adding PRB sector equipment ADD EUPRBSECTOREQM: LOCALCELLID=0,PrbId=0,SECTOREQMID=0; //Adding an operator to the cell ADD CELLOP: LocalCellId=0, TrackingAreaId=0;
Configuring a 2T4R Cell (1T2R+1T2R, 1T2R RRUs) //Adding a sector ADD SECTOR: SECTORID=0,SECNAME="huawei",LOCATIONNAME="huawei",ANTNUM=4,ANT1CN=0,ANT1SRN=60,ANT 1SN=0,ANT1N=R0A,ANT2CN=0,ANT2SRN=60,ANT2SN=0,ANT2N=R0B,ANT3CN=0,ANT3SRN=61,ANT3SN= 0,ANT3N=R0A,ANT4CN=0,ANT4SRN=61,ANT4SN=0,ANT4N=R0B,CREATESECTOREQM=FALSE; //Adding sector equipment ADD SECTOREQM: SECTOREQMID=0, SECTORID=0, ANTCFGMODE=ANTENNAPORT, ANTNUM=4, ANT1CN=0, ANT1SRN=60, ANT1SN=0, ANT1N=R0A, ANTTYPE1=RXTX_MODE, ANT2CN=0, ANT2SRN=60, ANT2SN=0, ANT2N=R0B, ANTTYPE2=RX_MODE, ANT3CN=0, ANT3SRN=61, ANT3SN=0, ANT3N=R0A, ANTTYPE3=RXTX_MODE, ANT4CN=0, ANT4SRN=61, ANT4SN=0, ANT4N=R0B, ANTTYPE4=RX_MODE; //Adding a cell ADD CELL: LocalCellId=0, CellName="cell0", NbCellFlag=TRUE, CoverageLevelType=COVERAGE_LEVEL_0-1&COVERAGE_LEVEL_1-1&COVERAGE_LEVEL_2-1, CellId=0, PhyCellId=0, FddTddInd=CELL_FDD, EuCellStandbyMode=ACTIVE, CustomizedBandWidthCfgInd=NOT_CFG, EmergencyAreaIdCfgInd=NOT_CFG, UePowerMaxCfgInd=NOT_CFG, MultiRruCellFlag=BOOLEAN_FALSE, TxRxMode=2T4R; //(Optional) In LTE in-band deployment, adding a PRB for the NB-IoT cell. For example, the frequency band is band 8, the uplink EARFCN is 21511, and the downlink EARFCN is 3590. ADD PRB: LocalCellId=0, PrbId=0, DeployMode=IN_BAND, FreqBand=8, UlEarfcnCfgInd=CFG, UlEarfcn=21511, UlFreqOffset=NEG_2, DlEarfcn=3590, DlFreqOffset=POS_0, LteCellId=1; //Adding PRB sector equipment ADD EUPRBSECTOREQM:LOCALCELLID=0,PrbId=0,SECTOREQMID=0; //Adding an operator to the cell ADD CELLOP: LocalCellId=0, TrackingAreaId=0;
Configuring a 2T4R Cell (2T2R+0T2R, 2T2R RRUs) //Adding RRU chains and RRUs ADD RRUCHAIN: RCN=0, TT=CHAIN, BM=COLD, AT=LOCALPORT, HSRN=0, HSN=3, HPN=0, CR=AUTO, USERDEFRATENEGOSW=OFF; ADD RRUCHAIN: RCN=1, TT=CHAIN, BM=COLD, AT=LOCALPORT, HSRN=0, HSN=3, HPN=1, CR=AUTO, USERDEFRATENEGOSW=OFF; ADD SUBRACK: CN=0, SRN=4, TYPE=RFU; ADD RRU: CN=0, SRN=4, SN=0, TP=TRUNK, RCN=0, PS=0, RT=MRFU, RS=LO, RXNUM=2, TXNUM=2; ADD RRU: CN=0, SRN=4, SN=1, TP=TRUNK, RCN=1, PS=0, RT=MRFU, RS=LO, RXNUM=2, TXNUM=2; //Adding a sector ADD SECTOR: SECTORID=0, SECNAME="huawei",LOCATIONNAME="huawei", ANTNUM=4, ANT1CN=0, ANT1SRN=4, ANT1SN=0, ANT1N=R0A, ANT2CN=0, ANT2SRN=4, ANT2SN=0, ANT2N=R0B, ANT3CN=0, ANT3SRN=4, ANT3SN=1, ANT3N=R0A, ANT4CN=0, ANT4SRN=4,
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ANT4SN=1, ANT4N=R0B, CREATESECTOREQM=FALSE; //Adding sector equipment ADD SECTOREQM: SECTOREQMID=0, SECTORID=0, ANTCFGMODE=ANTENNAPORT, ANTNUM=4, ANT1CN=0, ANT1SRN=4, ANT1SN=0, ANT1N=R0A, ANTTYPE1=RXTX_MODE, ANT2CN=0, ANT2SRN=4, ANT2SN=0, ANT2N=R0B, ANTTYPE2=RXTX_MODE, ANT3CN=0, ANT3SRN=4, ANT3SN=1, ANT3N=R0A, ANTTYPE3=RX_MODE, ANT4CN=0, ANT4SRN=4, ANT4SN=1, ANT4N=R0B, ANTTYPE4=RX_MODE; //Adding a cell ADD CELL: LocalCellId=0, CellName="cell0", NbCellFlag=TRUE, CoverageLevelType=COVERAGE_LEVEL_0-1&COVERAGE_LEVEL_1-1&COVERAGE_LEVEL_2-1, CellId=0, PhyCellId=0, FddTddInd=CELL_FDD, EuCellStandbyMode=ACTIVE, CustomizedBandWidthCfgInd=NOT_CFG, EmergencyAreaIdCfgInd=NOT_CFG, UePowerMaxCfgInd=NOT_CFG, MultiRruCellFlag=BOOLEAN_FALSE, TxRxMode=2T4R; //(Optional) In LTE in-band deployment, adding a PRB for the NB-IoT cell, for example, using frequency band 8, uplink EARFCN 21511, and downlink EARFCN 3590 ADD PRB: LocalCellId=0, PrbId=0, DeployMode=IN_BAND, FreqBand=8, UlEarfcnCfgInd=CFG, UlEarfcn=21511, UlFreqOffset=NEG_2, DlEarfcn=3590, DlFreqOffset=POS_0, LteCellId=1; //Adding PRB sector equipment ADD EUPRBSECTOREQM: LOCALCELLID=0,PrbId=0,SECTOREQMID=0; //Adding an operator to the cell ADD CELLOP: LocalCellId=0, TrackingAreaId=0;
Configuring a 4T4R Cell (Integrated 4T4R RRU) //Adding a sector and enabling automatic sector equipment addition ADD SECTOR: SECTORID=0,SECNAME="huawei",LOCATIONNAME="huawei",ANTNUM=4,ANT1CN=0,ANT1SRN=60,ANT 1SN=0,ANT1N=R0A,ANT2CN=0,ANT2SRN=60,ANT2SN=0,ANT2N=R0B,ANT3CN=0,ANT3SRN=60,ANT3SN= 0,ANT3N=R0C,ANT4CN=0,ANT4SRN=60,ANT4SN=0,ANT4N=R0D,CREATESECTOREQM=TRUE,SECTOREQMI D=0; //Adding a cell ADD CELL: LocalCellId=0, CellName="cell0", NbCellFlag=TRUE, CoverageLevelType=COVERAGE_LEVEL_0-1&COVERAGE_LEVEL_1-1&COVERAGE_LEVEL_2-1, CellId=0, PhyCellId=0, FddTddInd=CELL_FDD, EuCellStandbyMode=ACTIVE, CustomizedBandWidthCfgInd=NOT_CFG, EmergencyAreaIdCfgInd=NOT_CFG, UePowerMaxCfgInd=NOT_CFG, MultiRruCellFlag=BOOLEAN_FALSE, TxRxMode=4T4R, CrsPortMap=4T2P_0101; //(Optional) In LTE in-band deployment, adding a PRB for the NB-IoT cell, for example, using frequency band 8, uplink EARFCN 21511, and downlink EARFCN 3590 ADD PRB: LocalCellId=0, PrbId=0, DeployMode=IN_BAND, FreqBand=8, UlEarfcnCfgInd=CFG, UlEarfcn=21511, UlFreqOffset=NEG_2, DlEarfcn=3590, DlFreqOffset=POS_0, LteCellId=1; //Adding PRB sector equipment ADD EUPRBSECTOREQM:LOCALCELLID=0,PrbId=0,SECTOREQMID=0; //Adding an operator to the cell ADD CELLOP: LocalCellId=0, TrackingAreaId=0;
Configuring a 4T4R Cell (2T2R+2T2R, 2T2R RRUs) //Adding a sector and enabling automatic sector equipment addition ADD SECTOR: SECTORID=0,SECNAME="huawei",LOCATIONNAME="huawei",ANTNUM=4,ANT1CN=0,ANT1SRN=60,ANT 1SN=0,ANT1N=R0A,ANT2CN=0,ANT2SRN=60,ANT2SN=0,ANT2N=R0B,ANT3CN=0,ANT3SRN=61,ANT3SN= 0,ANT3N=R0A,ANT4CN=0,ANT4SRN=61,ANT4SN=0,ANT4N=R0B,CREATESECTOREQM=TRUE,SECTOREQMI D=0; //Adding a cell ADD CELL: LocalCellId=0, CellName="cell0", NbCellFlag=TRUE, CoverageLevelType=COVERAGE_LEVEL_0-1&COVERAGE_LEVEL_1-1&COVERAGE_LEVEL_2-1, CellId=0, PhyCellId=0, FddTddInd=CELL_FDD, EuCellStandbyMode=ACTIVE, CustomizedBandWidthCfgInd=NOT_CFG, EmergencyAreaIdCfgInd=NOT_CFG, UePowerMaxCfgInd=NOT_CFG, MultiRruCellFlag=BOOLEAN_FALSE, TxRxMode=4T4R, CrsPortMap=4T2P_0101; //(Optional) In LTE in-band deployment, adding a PRB for the NB-IoT cell, for example, using frequency band 8, uplink EARFCN 21511, and downlink EARFCN 3590
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ADD PRB: LocalCellId=0, PrbId=0, DeployMode=IN_BAND, FreqBand=8, UlEarfcnCfgInd=CFG, UlEarfcn=21511, UlFreqOffset=NEG_2, DlEarfcn=3590, DlFreqOffset=POS_0, LteCellId=1; //Adding PRB sector equipment ADD EUPRBSECTOREQM:LOCALCELLID=0,PrbId=0,SECTOREQMID=0; //Adding an operator to the cell ADD CELLOP: LocalCellId=0, TrackingAreaId=0;
Configuring a 4T4R Cell (2T2R+2T2R, 2T4R RRUs) //Adding a sector ADD SECTOR: SECTORID=0,SECNAME="huawei",LOCATIONNAME="huawei",ANTNUM=4,ANT1CN=0,ANT1SRN=60,ANT 1SN=0,ANT1N=R0A,ANT2CN=0,ANT2SRN=60,ANT2SN=0,ANT2N=R0B,ANT3CN=0,ANT3SRN=61,ANT3SN= 0,ANT3N=R0A,ANT4CN=0,ANT4SRN=61,ANT4SN=0,ANT4N=R0B,CREATESECTOREQM=FALSE; //Adding sector equipment ADD SECTOREQM: SECTOREQMID=0, SECTORID=0, ANTCFGMODE=ANTENNAPORT, ANTNUM=4, ANT1CN=0, ANT1SRN=60, ANT1SN=0, ANT1N=R0A, ANTTYPE1=RXTX_MODE, ANT2CN=0, ANT2SRN=60, ANT2SN=0, ANT2N=R0B, ANTTYPE2=RXTX_MODE, ANT3CN=0, ANT3SRN=61, ANT3SN=0, ANT3N=R0A, ANTTYPE3=RXTX_MODE, ANT4CN=0, ANT4SRN=61, ANT4SN=0, ANT4N=R0B, ANTTYPE4=RXTX_MODE; //Adding a cell ADD CELL: LocalCellId=0, CellName="cell0", NbCellFlag=TRUE, CoverageLevelType=COVERAGE_LEVEL_0-1&COVERAGE_LEVEL_1-1&COVERAGE_LEVEL_2-1, CellId=0, PhyCellId=0, FddTddInd=CELL_FDD, EuCellStandbyMode=ACTIVE, CustomizedBandWidthCfgInd=NOT_CFG, EmergencyAreaIdCfgInd=NOT_CFG, UePowerMaxCfgInd=NOT_CFG, MultiRruCellFlag=BOOLEAN_FALSE, TxRxMode=4T4R, CrsPortMap=4T2P_0101; //(Optional) In LTE in-band deployment, adding a PRB for the NB-IoT cell, for example, using frequency band 8, uplink EARFCN 21511, and downlink EARFCN 3590 ADD PRB: LocalCellId=0, PrbId=0, DeployMode=IN_BAND, FreqBand=8, UlEarfcnCfgInd=CFG, UlEarfcn=21511, UlFreqOffset=NEG_2, DlEarfcn=3590, DlFreqOffset=POS_0, LteCellId=1; //Adding cell sector equipment ADD EUPRBSECTOREQM:LOCALCELLID=0,PrbId=0,SECTOREQMID=0; //Adding an operator to the cell ADD CELLOP: LocalCellId=0, TrackingAreaId=0;
Deactivation Command Examples MOD CELL: LocalCellId=0,TxRxMode=1T1R;
6.2.4.1.4 Using the CME For detailed operations, see CME-based Feature Configuration.
6.2.4.2 Verification and Monitoring Activation Verification Step 1 Start an RSSI monitoring task on the U2020 client to monitor the RSSIs of antennas. Item for Monitoring
Unit
Value Range
Description
Antenna y Antenna y R RS SSI
dBm
-140 to -50
Antenna y y RSSI RSSI in the system bandwidth
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Step 2 Check the monitoring results. Feature
Successful Result
UL 2-Antenna Receive Diversity
The RSSIs of antennas 0 and 1 are not N/A.
UL 4-Antenna Receive Diversity
The RSSIs of antennas 0 to 3 are not N/A.
----End
Network Monitoring For FDD, monitor the counters listed in Table 6-7 and calculate the uplink cell throughput. The more the antennas for a cell, the higher the cell throughput, under the same conditions such as the same cell, bandwidth, and total transmit power power.. Table 6-7 6 -7 Counters related to receive diversity
Counter ID
Counter Name
1526728259
L.Thrp.bits.UL
1526728998
L.Thrp.Time.Cell.UL.HighPrecision
Monitor the counters listed in Table 6-8 to check the status of connections between antennas and RRU ports. If the average RSSI value of antenna x antenna x is is much less than those of the other antennas, antenna x antenna x is is not connected to an RRU port. In Figure 6-14, antennas 2 and 3 are not connected to RRU ports. Table 6-8 6 -8 Counters related to average RSSI values
Counter ID 1526737656 through 1526737663
Counter Name
Figure 6-14 Example of average RSSI values
L.CellSectorEQUIP.UL.RSSI.Avg.Ant0 through L.CellSectorEQUIP.UL.RSSI.Avg.Ant7
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For NB-IoT, NB-IoT, the values of the following performance indicators will increase after uplink 4antenna receive diversity is enabled. l
Average uplink MCS index = (1 x L.NB.ChMeas.NPUSCH.MCS.1 + 2 x L.NB.ChMeas.NPUSCH.MCS.2 + ... + 13 x L.NB.ChMeas.NPUSCH.MCS.13 ) / (L.NB.ChMeas.NPUSCH.MCS.0 + L.NB.ChMeas.NPUSCH.MCS.1 + L.NB.ChMeas.NPUSCH.MCS.2 + ... + L.NB.ChMeas.NPUSCH.MCS.13 )
l
Average uplink throughput = L.NB.Thrp.bits.UL / L.NB.Thrp.Time.UL
If the received power is not balanced between two of the four antennas due to interference or feeder length difference, the advantage of 4-antenna receive diversity over 2-antenna receive diversity will be affected.
6.3 UL 2x2 MU-MIMO (FDD) 6.3.1 Principles Uplink MU-MIMO is controlled by the UlVmimoSwitch option of the CellAlgoSwitch.UlSchSwitch parameter. To enable 2x2 MU-MIMO in a cell, select this option and ensure that the cell works in at least 2R mode. This feature can be used for UEs when channel conditions are favorable.
The eNodeB attempts to pair UEs in each transmission time interval (TTI). If the pairing succeeds, the eNodeB performs 2x2 MU-MIMO, as shown in Figure 6-15. Figure 6-15 Uplink 2x2 MU-MIMO
UE Selection In each TTI, the eNodeB schedules UEs in sequence. If all resources are used up but some UEs are still not scheduled, the eNodeB attempts to pair unscheduled UEs with scheduled UEs.
Pairing Judgment Based on the pre-pairing SINR and inter-UE channel correlation, the eNodeB calculates the post-pairing SINR and then then calculates the post-pairing post-pairing spectral efficiency efficiency.. The eNodeB pairs two UEs only if the total post-pairing spectral efficiency is higher than the total pre-pairing spectral efficiency.
6.3.2 Network Analysis
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6.3.2.1 Benefits Uplink MU-MIMO provides a higher Cell Uplink Average Throughput than uplink receive diversity.. Uplink MU-MIMO can offer significant gains when the following conditions are diversity met: l
The PUSCH load is high. That is, the uplink physical resource block (PRB) usage
l
exceeds 90%. There are adequate PDCCH resources for UE pairing. That is, the control channel element (CCE) usage is less than 80%.
6.3.2.2 Impacts Network Impacts Uplink coverage may deteriorate and CEU throughput may decrease in high interference scenarios because more UEs are scheduled in uplink MU-MIMO.
Function Impacts Function
Function
Name
Switch
VoIP semi persistent scheduling
UL CoMP
Reference
Description
SpsSchSwitch option of the CellAlgoSwitc h.UlSchSwitch parameter
VoLTE
To ensure good post-pairing demodulation performance, VoIP UEs are not involved in pairing for MU-MIMO when the number of RBs semi-persistently scheduled for such a UE is less than 2.
UlJointRecepti onSwitch option of the CellAlgoSwitc h.UplinkComp Switch
UL CoMP
UEs selected for UL CoMP are not involved in pairing for uplink MUMIMO. Type-1 UL CoMP has the highest priority, uplink MUMIMO the second, and type-2 UL CoMP the third.
parameter PSIC receiver MumimoPusch PSIC Receiver PsicSwitch option of the CellAlgoSwitc h. PsicSwitch PsicSwitch parameter High speed mobility
Cell. HighSpeed HighSpeed High Speed Mobility Flag
The PSIC receiver can be used in uplink MU-MIMO to improve signal reception quality for paired UEs.
UEs moving at high speed are not involved in pairing for uplink MUMIMO.
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Function Name
Function Switch
Reference
Description
Uplink joint reception in an SFN cell
CellAlgoSwitc h. SfnUplinkCo SfnUplinkCo mpSwitch
SFN
UEs selected for uplink joint reception in an SFN cell are not involved in pairing for uplink MUMIMO. Uplink joint reception takes precedence over uplink MUMIMO.
Uplink enhancement for remote interference suppression
Interference RMT_INF_PU Interference SCH_ENH_S Detection and W option of the Suppression UlInterfSuppr essCfg. RemoteI RemoteI nfULEnhanceS w parameter
Superior uplink coverage
CellAlgoExtSw itch.UlCoverag eEnhancement Sw
NSA networking based on EPC
NSA_DC_CAP NSA ABILITY_SW Networking ITCH option of based on EPC the NsaDcMgmtC NsaDcAl onfig. NsaDcAl goSwitch parameter
If this function is enabled and the eNodeB has detected atmospheric duct remote interference, uplink MU-MIMO does not take effect.
Superior Uplink UEs under enhanced coverage are not involved in UE pairing for Coverage MU-MIMO. (FDD)
l
When TDM power control is in progress, uplink MU-MIMO cannot take effect.
l
If TDM needs to be triggered for a UE while uplink MUMIMO is being performed on the UE, then the UE exits uplink MU-MIMO, not participating in pairing.
6.3.3 Requirements 6.3.3.1 Licenses Feature ID
Feature Name
Model
Sales Unit
LOFD-001002
UL 2x2 MUMIMO
LT1S0U2I2O00
Per Cell
In addition to feature licenses, capacity licenses are required for MIMO. Each BBP is licensed by default to provide two baseband TX channels channels and two baseband RX channels for each each cell. Each RF module is licensed by default to provide two RF TX channels and two RF RX channels. For details, see License see License Control Control Item Lists (FDD). (FDD).
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6.3.3.2 Software Before activating this function, ensure that its prerequisite functions have been activated and mutually exclusive functions have been deactivated. For detailed operations, see the relevant feature documents.
Prerequisite Functions None
Mutually Exclusive Functions Function Name Short TTI
Function Switch
Reference
SHORT_TTI_SW option Short TTI (FDD) of the CellShortTtiAlgo. SttiAlgoS SttiAlgoS witch parameter
Static Shared Beam
None
Massive MIMO (FDD) (FDD)
Dynamic Dedicated Beam Intelligent beam shaping
MM_INTELLIGENT_BE Massive MIMO (FDD) (FDD) AM_SHAPING_SW option of the SectorSp SectorSplitGroup . SectorSp litSwitch parameter
6.3.3.3 Hardware Base Station Models The following base stations are compatible with this function: l l
3900 and 5900 series base stations DBS3900 LampSite and DBS5900 LampSite
Boards This function requires 2R BBPs.
RF Modules No requirements
6.3.3.4 Others None
6.3.4 Operation and Maintenance
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6.3.4.1 Data Configuration 6.3.4.1.1 Data Preparation 6 -9 describes the parameters used for function activation. Table 6-9 Table 6-9 6 -9 Parameters used for activation
Parameter Name
Parameter ID
Option
Setting Notes
Uplink schedule switch
CellAlgoSwitch.Ul SchSwitch
UlVmimoSwitch
Select tth his op opti tio on.
6.3.4.1.2 Using MML Commands
Activation Command Examples //Configuring uplink MU-MIMO MOD CELLALGOSWITCH: LocalCellId=0,UlSchSwitch=UlVmimoSwitch-1;
Optimization Command Examples N/A
Deactivation Command Examples //Disabling uplink MU-MIMO MOD CELLALGOSWITCH: LocalCellId=0,UlSchSwitch=UlVmimoSwitch-0;
6.3.4.1.3 Using the CME For detailed operations, see CME-based Feature Configuration.
6.3.4.2 Verification and Monitoring Activation Verification Step 1 Start an MU-MIMO monitoring task on the U2020 client to monitor the number of UE pairs in uplink MU-MIMO.
Item for Monitoring
Unit
Value Range
Description
Mimo UE Pair Num
Pair
0 to 32000
This item indicates the total number of UE pairs in all TTIs of a monitoring period. This number increases by one when two UEs are paired for MU-MIMO in a TTI.
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Step 2 Enable multiple UEs to access the network. Step 3 Check whether uplink MU-MIMO has taken effect. Item for Monitoring
Monitoring Result
Description
Mimo UE Pair Num
Not N/A
MU-MIMO is active.
Greater than 0
UEs are successfully paired.
----End
Network Monitoring Tablee 6-10 to monitor monitor uplink MU-MIMO. If any counter has a nonUse the counters listed in Tabl zero value, uplink MU-MIMO is functioning properly. properly. If the counter values are always zero, uplink MU-MIMO is not functioning properly. properly.
In these counters, the L.Traffic.VMIMO.2ndLayer.TB.bits counter measures the number of bits in the TBs of paired UEs UEs at the second layer. layer. Table 6-10 6 -10 Counters related to uplink MU-MIMO
Counter ID
Counter Name
1526728349
L.ChMeas.VMIMO.PairPRB.Succ
1526728350
L.ChMeas.VMIMO.PairPRB.Tot
1526747756
L.Traffic.VMIMO.2ndLayer.TB.bits
6.4 UL 2x4 MU-MIMO 6.4.1 Principles Uplink MU-MIMO is controlled by the UlVmimoSwitch option of the CellAlgoSwitch.UlSchSwitch parameter. To enable 2x4 MU-MIMO in a cell, select this option and ensure that the cell works in at least 4R mode. This function can be used for UEs when channel conditions are favorable. The eNodeB attempts to pair UEs in each TTI. If the pairing succeeds, the eNodeB performs 2x4 MU-MIMO. Figure 6-16 shows uplink uplink 2x4 MU-MIMO. MU-MIMO.
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Figure 6-16 Uplink 2x4 MU-MIMO
UE Selection In each TTI, the eNodeB schedules UEs in sequence. If all resources are used up but some UEs are still not scheduled, the eNodeB attempts to pair unscheduled UEs with scheduled UEs.
Pairing Judgment Based on the pre-pairing SINR and inter-UE channel correlation, the eNodeB calculates the post-pairing SINR and then then calculates the post-pairing post-pairing spectral efficiency efficiency.. The eNodeB pairs two UEs only if the total post-pairing spectral efficiency is higher than the total pre-pairing spectral efficiency.
6.4.2 Network Analysis 6.4.2.1 Benefits Uplink MU-MIMO provides a higher Cell Uplink Average Throughput than uplink receive diversity.. Uplink MU-MIMO can offer significant gains when the following conditions are diversity met: l l
In FDD, PUSCH load is high. That is, i s, the uplink PRB usage exceeds 90%. There are adequate PDCCH resources for UE pairing. That is, the CCE usage is less than 80%.
6.4.2.2 Impacts Network Impacts Uplink coverage may deteriorate and CEU throughput may decrease in high interference scenarios because more UEs are scheduled in uplink MU-MIMO.
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Function Impacts RAT
Function Name
Function Switch
Reference
Description
FDD
VoIP semi persistent
SpsSchSwitc h option of
VoLTE
To ensure good post pairing demodulation
scheduling
the CellAlgoSwit ch.UlSchSwit ch parameter
FDD
UL CoMP
UlJointRece ptionSwitch option of the CellAlgoSwit ch.UplinkCo mpSwitch parameter
performance, VoIP UEs are not involved in pairing for MU-MIMO MU-MIMO when the number of RBs semi-persistently scheduled for such a UE is less than 2. UL CoMP
UEs selected for UL CoMP are not involved in pairing for uplink MU-MIMO. Type-1 UL CoMP has the highest priority,, uplink MU priority MIMO the second, and type-2 UL CoMP the third.
FDD
PSIC receiver MumimoPus PSIC Receiver chPsicSwitch option of the CellAlgoSwit PsicSwitc ch. PsicSwitc h parameter
The PSIC receiver can be used in uplink MUMIMO to improve signal reception quality for paired UEs.
FDD
High speed mobility
Cell. HighSpe HighSpe High Speed edFlag Mobility
UEs moving at high speed are not involved in pairing for uplink MUMIMO.
FDD
Uplink joint reception in an SFN cell
CellAlgoSwit SfnUplink ch. SfnUplink CompSwitch
SFN
UEs selected for uplink joint reception in an SFN SFN cell are not involved in pairing for uplink MUMIMO. Uplink joint reception takes precedence over uplink MU-MIMO.
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RAT
Function Name
Function Switch
Reference
FDD
NSA networking based on EPC
NSA_DC_C APABILITY _SWITCH
NSA Networking based on EPC
option of the NsaDcMgmt Config. NsaD NsaD cAlgoSwitch parameter
FDD
Superior uplink CellAlgoExt coverage Switch.UlCo verageEnhan cementSw
Description l
l
Superior Uplink Coverage (FDD)
When TDM power control is in progress, uplink MU-MIMO cannot take effect. If TDM needs to be triggered for a UE while uplink MUMIMO is being performed on the UE, UE, then the UE exits uplink MU-MIMO, not participating in pairing.
UEs under enhanced coverage are not involved in UE pairing for MU-MIMO.
6.4.3 Requirements 6.4.3.1 Licenses RAT
Feature ID
Feature Name
Model
Sales Unit
FDD
LOFD-001002
UL 2x2 MU-MIMO
LT1S0U2I2O00
Per Cell
FDD
LOFD-001005
UL 4-Antenna Receive Diversity
LT1S0U4ARD00
Per C Ceell
FDD
LOFD-001058
UL 2x4 MU-MIMO
LT1S0UMIMO00
Per Cell
In addition to feature licenses, capacity licenses are required for MIMO. Each BBP is licensed by default to provide two baseband TX channels channels and two baseband RX channels for each each cell. Each RF module is licensed by default to provide two RF TX channels and two RF RX channels. For details, see License see License Control Control Item Lists (FDD). (FDD).
6.4.3.2 Software Before activating this function, ensure that its prerequisite functions have been activated and mutually exclusive functions have been deactivated. For detailed operations, see the relevant feature documents.
Prerequisite Functions None
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Mutually Exclusive Functions RAT
Function Name
Function Switch
Refe Re fere renc nce e
Desc Descri ript ptio ion n
FDD
Static Shared Beam
None
Massive MIMO
None
Dynamic Dedicated Beam FDD
Intelligent beam shaping
(FDD) MM_INTELL Massive MIMO IGENT_BEA M_SHAPING_ (FDD) SW option of the SectorSplitGro up. SectorSplitS SectorSplitS witch parameter
6.4.3.3 Hardware Base Station Models This function requires 3900 or 5900 series base stations.
Boards This function requires 4R BBPs.
RF Modules No requirements
6.4.3.4 Others None
6.4.4 Operation and Maintenance 6.4.4.1 Data Configuration (FDD) 6.4.4.1.1 Data Preparation Table 6-11 describes the parameters used for function activation.
None
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Table 6-11 Parameters used for activation
Parameter Name
Parameter ID
Option
Setting Notes
Uplink schedule switch
CellAlgoSwitch.Ul SchSwitch
UlVmimoSwitch
Select tth his op opti tio on.
6.4.4.1.2 Using MML Commands
Activation Command Examples //Configuring uplink MU-MIMO MOD CELLALGOSWITCH: LocalCellId=0,UlSchSwitch=UlVmimoSwitch-1;
Optimization Command Examples N/A
Deactivation Command Examples //Disabling uplink MU-MIMO MOD CELLALGOSWITCH: LocalCellId=0,UlSchSwitch=UlVmimoSwitch-0;
6.4.4.1.3 Using the CME For detailed operations, see CME-based Feature Configuration.
6.4.4.2 Verification and Monitoring Activation Verification Step 1 Start an MU-MIMO monitoring task on the U2020 client to monitor the number of UE pairs in uplink MU-MIMO.
Item for Monitoring
Unit
Value Range
Description
Mimo UE Pair Num
Pair
0 to 32000
This item indicates the total number of UE pairs in all TTIs of a monitoring period. This number increases increases by one when two UEs are paired for MUMIMO in a TTI.
Step 2 Enable multiple UEs to access the network. Step 3 Check whether uplink MU-MIMO has taken effect. Item for Monitoring
Monitoring Result
Description
Mimo UE Pair Num
Not N/A
Uplink MU-MIMO has taken effect.
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Item for Monitoring
Monitoring Result
Description
Greater than 0
UEs are successfully paired.
----End
Network Monitoring 6 -12 to monitor uplink MU-MIMO. If any counter has a nonUse the counters listed in Table 6-12 zero value, uplink MU-MIMO is functioning properly. properly. If the counter values are always zero, uplink MU-MIMO is not functioning properly. properly. Table 6-12 6 -12 Counters related to uplink MU-MIMO
Counter ID
Counter Name
1526728349
L.ChMeas.VMIMO.PairPRB.Succ
1526728350
L.ChMeas.VMIMO.PairPRB.Tot
1526739789
L.ChMeas.VMIMO.PairPRB.Succ.VoLTE
1526739782
L.ChMeas.VMIMO.PairPRB2Layer.Succ
1526740469
L.ChMeas.VMIMO.Succ.SubFrameNum
1526747756
L.Traffic.VMIMO.2ndLayer.TB.bits
6.5 UL SU-MIMO 6.5.1 Principles Uplink SU-MIMO allows 2T UEs to work in transmission mode 2 (TM2).
6.5.1.1 Uplink Transmission Modes Uplink SU-MIMO is controlled by the ULSUMIMO2LayersSwitch option of the CellAlgoSwitch.UlSuMimoAlgoSwitch parameter. l
When this option is deselected, all UEs in the cell can work only in TM1.
l
When this option is selected, 2T UEs in the cell can work in TM2.
Table 6-13 6 -13 describes the uplink transmission modes.
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Table 6-13 6 -13 Uplink transmission modes
Transmission Mode
Number of Codewords
Numb Nu mbe er of La Lay yer erss
Rank ank
TM1
1
1
1
TM2
1 2
1 2
1 2
6.5.1.2 Rank Selection The rank selected in TM2 is specified by the CellUlMimoParaCfg.UlSuMimoRankPara parameter.. parameter l
When this parameter is set to FixRank1, all UEs use rank 1 transmission.
l
When this parameter is set to FixRank2, all UEs use rank 2 transmission.
l
When this parameter is set to RankAdaptive, UE 1 in poor channel conditions uses rank 1 transmission i n good channel conditions uses rank 2 transmission, as shown in Figure 6-17.and UE 2 in
Figure 6-17 Adaptive rank selection
6.5.2 Network Analysis 6.5.2.1 Benefits Uplink SU-MIMO provides the following benefits when there are 2T UEs in a cell: l
Nearly doubles the uplink peak throughput.
l
Increases the User Uplink Average Throughput of non-cell-edge UEs by 5% to 20%.
l
Increases the Cell Uplink Average Throughput.
SU-MIMO offers higher gains in the following conditions: l
The eNodeB has more RX antennas.
l
The average uplink SINR is higher. higher.
l
A larger proportion of UEs support SU-MIMO.
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6.5.2.2 Impacts Network Impacts None
Function Impacts RAT
Function Name
Function Switch
Reference
Description
FDD
Uplink 2x4 MU-MIMO
UlVmimoSwitc h option of the CellAlgoSwitc h.UlSchSwitch parameter
6.4 UL 2x4 MU-MIMO
UEs selected for uplink SU-MIMO are not selected for MU-MIMO.
FDD
UL CoMP cell UlJointRecepti onSwitch option of the CellAlgoSwitc h.UplinkComp Switch parameter
UL CoMP
This function does not apply to UEs performing rank 2 transmission in TM2.
FDD
PAMC
Scheduling
PAMC is not performed on uplink SU-MIMO UEs.
FDD
Turbo receiver CellAlgoSwitc h.TurboReceive rSwitch
Turbo Receiver
FDD
Intra-eNodeB &
CellAlgoSwitc
Uplink
This function does not apply to UEs performing rank 2 transmission in TM2.
inter-eNodeB uplink interference cancellation
h.UplinkIcSwit Interference Interferenc e ch Cancellation (FDD)
FDD
NSA networking based on EPC
NSA_DC_CAP NSA ABILITY_SW Networking ITCH option of based on EPC the NsaDcMgmtC onfig. NsaDcAl NsaDcAl goSwitch parameter
FDD
Uplink joint reception
CellAlgoSwitc h. SfnUplinkCo SfnUplinkCo mpSwitch
UlPAMCSwitc h option of the CellAlgoSwitc h.UlSchExtSwi tch parameter
SFN
If uplink SU-MIMO has taken effect, TDM will not take effect.
Uplink joint reception does not apply to UEs performing rank 2 transmission in TM2.
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RAT
Function Name
FDD
Short TTI
Function Switch
Reference
Description
SHORT_TTI_ SW option of the
Short TTI (FDD)
UEs scheduled in short TTI mode do not support uplink SU-MIMO.
CellShortTtiAl go. SttiAlgoSwit SttiAlgoSwit ch parameter
FDD
Superior up uplink coverage
CellAlgoExtSw itch.UlCoverag eEnhancement Sw
Superior Uplink Uplink SU-MIMO is not Coverage applicable to UEs under (FDD) enhanced coverage.
6.5.3 Requirements 6.5.3.1 Licenses RAT
Feature ID
Feature Name
Model
Sales Unit
FDD
LOFD-130 201
UL SU-MIMO
LT1SULSUMI MO
Per Cell
In addition to feature licenses, capacity licenses are required for MIMO. Each BBP is licensed by default to provide two baseband TX channels channels and two baseband RX channels for each each cell. Each RF module is licensed by default to provide two RF TX channels and two RF RX channels. For details, see License see License Control Control Item Lists (FDD). (FDD).
6.5.3.2 Software
Before activating this function, ensure that its prerequisite functions have been activated and mutually exclusive functions have been deactivated. For detailed operations, see the relevant feature documents.
Prerequisite Functions
RAT
Function Name
Function Switch
Reference
FDD
None
None
None
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Mutually Exclusive Functions RAT
Function Name
Function Switch
FDD
High speed mobility Cell. HighSpeedFlag HighSpeedFlag
High Speed Mobility
TDD
Uplink FDD+TDD CA
InterFddTddCaSwitch option of the CaMgtCfg .CellCaAlgoSwitch parameter
Carrier Aggregation
FDD
Static Shared Beam
None
Massive MIMO (FDD)
TDD FDD
Dynamic Dedicated Beam FDD
Intelligent beam shaping
Reference
MM_INTELLIGENT_BEAM_S Massive MIMO (FDD) HAPING_SW option of the SectorSplitGroup . SectorSplitSwit SectorSplitSwit ch parameter
6.5.3.3 Hardware Base Station Models For FDD, the following base stations are compatible with this function: l
3900 and 5900 series base stations
l
DBS3900 LampSite and DBS5900 LampSite
l
BTS3912E
l
BTS3911E
Boards BBPs must be UBBPd or UBBPe.
RF Modules No requirements
Cells Cells must have a bandwidth of 10 MHz or higher and have two or more RX channels.
6.5.3.4 Others UEs must comply with 3GPP Release 8 or later and support 2T.
6.5.4 Operation and Maintenance
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6.5.4.1 Data Configuration (FDD) 6.5.4.1.1 Data Preparation 6 -14 describes the parameters used for function activation. Table 6-14 Table 6-14 6 -14 Parameters used for activation
Parameter Name
Parameter ID
Option
Setting Notes
UL SU-MIMO Algorithm Switch
CellAlgoSwitch.UlS ULSUMIMO2Layer Selecting this option uMimoAlgoSwitch sSwitch is recommended.
UpLink SU-MIMO Rank
CellUlMimoParaCf None g.UlSuMimoRankP ara
The value RankAdaptive is recommended.
Table 6-15 6 -15 describes the parameters used for function optimization. Table 6-15 6 -15 Parameters used for optimization
Parameter Name
Parameter ID
Option
Setting Notes
SRS Configuration Indicator
SRSCfg. SrsCfgInd SrsCfgInd
None
The value BOOLEAN_TRUE is recommended.
FDD SRS Configuration Mode
SRSCfg.FddSrsCfg None Mode
The value DEFAULTMODE is recommended.
Uplink schedule switch
CellAlgoSwitch.UlS SchedulerCtrlPochSwitch werSwitch
Selecting this option is recommended if uplink SU-MIMO is enabled.
CA UE RLC Parameter Adaptive Threshold
RlcPdcpParaGrou p.CaUeRlcParaAdp tiveThd
None
Set this parameter to the recommended value.
CA UE Reordering Timer(ms)
RlcPdcpParaGrou None p.CaUeReorderingT imer
Set this parameter to the recommended value.
CA UE Status Prohibit Timer(ms)
RlcPdcpParaGrou p.CaUeStatProhTi mer
None
Set this parameter to the recommended value.
Uplink power control algorithm
CellAlgoSwitch.Ul PcAlgoSwitch
UlCaPuschPcOptSwitch
Selecting this option is recommended.
switch
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6.5.4.1.2 Using MML Commands
Activation Command Examples //Enabling uplink SU-MIMO and rank adaptation MOD CELLALGOSWITCH: LOCALCELLID=0, UlSuMimoAlgoSwitch = ULSUMIMO2LayersSwitch-1; MOD CELLULMIMOPARACFG: LocalCellId=0, UlSuMimoRankPara = RankAdaptive;
Optimization Command Examples //Specifying an SRS configuration policy MOD SRSCFG: LocalCellId=0, SrsCfgInd=BOOLEAN_TRUE, FddSrsCfgMode=DEFAULTMODE; //Enabling power control by the uplink scheduler MOD CELLALGOSWITCH: LocalCellId=0, UlSchSwitch=SchedulerCtrlPowerSwitch-1;
Adjust parameters in uplink CA scenarios. //Configuring an RLC/PDCP parameter group MOD RLCPDCPPARAGROUP: RlcPdcpParaGroupId=5, RlcMode=RlcMode_AM, CaUeRlcParaAdptiveThd=10, CaUeReorderingTimer=Treordering_m20, CaUeStatProhTimer=m20; //Enabling PUSCH power control optimization for uplink CA UEs MOD CELLALGOSWITCH: LocalCellId=0, UlPcAlgoSwitch=UlCaPuschPcOptSwitch-1; UlPcAlgoSwitch=UlCaPuschPcOptSwitch-1;
Deactivation Command Examples //Disabling uplink SU-MIMO MOD CELLALGOSWITCH: LOCALCELLID=0, UlSuMimoAlgoSwitch = ULSUMIMO2LayersSwitch-0;
6.5.4.1.3 Using the CME For detailed operations, see CME-based Feature Configuration.
6.5.4.2 Verification and Monitoring Activation Verification l
Uu DCI status monitoring Uplink SU-MIMO is active if PDCCH downlink control information (DCI) format 4 is used in TM2 at least once. The number of times this format can be obtained via Uu DCI status monitoring.
l
Counter observation Uplink SU-MIMO is active if any of the counters listed in Table 6-16 6 -16 has a value greater than 0.
Table 6-16 6 -16 Counters related to uplink SU-MIMO
Counter ID
Counter Name
1526746681
L.Traffic.User.ULSUMIMO.Avg
1526743750
L.ChMeas.ULMIMO.PRB.CL.Rank1
1526743751
L.ChMeas.ULMIMO.PRB.CL.Rank2
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Benefit Monitoring Uplink SU-MIMO increases the User Uplink Average Throughput and Cell Uplink 6 -17 lists the related counters. Average Throughput. Table 6-17 l
User Uplink Average Throughput = (L.Thrp.bits.UL – L.Thrp.bits.UE.UL.LastTTI)/L.Thrp.Time.UE.UL.RmvLastTTI
l
Cell Uplink Average Throughput = L.Thrp.bits.UL / L.Thrp.Time.Cell.UL.H L.Thrp.T ime.Cell.UL.HighPrecision ighPrecision
A higher proportion of RBs used for rank 2 transmission indicates a higher increase in throughput. Proportion of RBs used for rank 2 transmission = L.ChMeas.ULMIMO.PRB.CL.Rank2 / L.ChMeas.PRB.PUSCH.Avg Table 6-17 6 -17 Counters for calculating the average uplink cell throughput
Counter ID
Counter Name
1526728259
L.Thrp.bits.UL
1526728998
L.Thrp.Time.Cell.UL.HighPrecision
1526729049
L.Thrp.bits.UE.UL.LastTTI
1526729050
L.Thrp.Time.UE.UL.RmvLastTTI
CCE Monitoring When uplink SU-MIMO is active, DCI format 4 is used in scheduling. When uplink SUMIMO is inactive, DCI format 0 is used in scheduling. Compared with DCI format 0, DCI format 4 results in a higher payload. It may also result in higher CCE usage and greater values of the counters listed in Table 6-18 6 -18. The increase depends on UE quantity and cell load. Table 6-18 6 -18 CCE-related counters
Counter ID
Counter Name
1526728304
L.ChMeas.CCE.ULUsed
1526729295
L.ChMeas.CCE.ULUsed.Equivalent
526730844
L.ChMeas.CCE.UL.AllocFail
The increase in CCE usage may result in changes in the values of the counters listed in Table 6-19.
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Table 6-19 6 -19 CCE-associated counters
Counter ID
Counter Name
1526728774
L.RRC.ConnSetup.TimeAvg
1526728775
L.RRC.ConnSetup.TimeMax
1526728776
L.E-RAB.Est.TimeAvg
1526728777
L.E-RAB.Est.TimeMax
Full Buffer Service Test Monitoring The gains provided by uplink SU-MIMO decrease during a full buffer service test when the accuracy of uplink power control is affected by uplink interference. l
l
If the pre-test PRB usage is less than 50%, you are advised to enable power control by the uplink scheduler to maintain the benefits provided by uplink SU-MIMO during the full buffer service test. This power control function is controlled by the SchedulerCtrlPowerSwitch option of the CellAlgoSwitch.UlSchSwitch parameter. If the pre-test PRB usage is not less than 50% or the full buffer service test is not performed, you are are advised to disable power power control by the uplink scheduler scheduler.. If this 6 -20 may increase. function is enabled, the values of counters listed in Table 6-20
PRB usage = L.ChMeas.PRB.UL.Used.Avg / Total number of uplink PRBs of the system bandwidth
Table 6-20 6 -20 Counters related to uplink interference
Counter ID
Counter Name
1526728297
L.UL.Interference.Max
1526728298
L.UL.Interference.Avg
1526743751
L.UL.Interference.Min
1526743709
L.UL.Interference.LinearAvg
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eRAN MIMO Feature Parameter Description
7 Parameters
7
Parameters
The following hyperlinked EXCEL files of parameter documents match the software version with which this document is released. l l
Node Parameter Reference: contains contains device and transport transport parameters. eNodeBFunction Parameter Reference: Reference: contains all parameters related to radio access functions, including air interface management, access control, mobility control, and radio resource management.
l
eNodeBFunction Used Reserved Parameter List: contains the reserved parameters that are in use and those that have been disused.
You can find the EXCEL files of parameter reference and used reserved parameter list for the software version used on the live network from the product documentation delivered with that version.
FAQ 1: How do I find the parameters related to a certain feature from parameter reference?
Step 1 Open the EXCEL file of parameter reference. Step 2 On the Parameter List sheet, filter the Feature ID column. Click Text Filters and choose Contains. Enter the feature ID, for example, LOFD-001016 or TDLOFD-001016.
Step 3 Click OK . All parameters related to the feature are displayed. ----End FAQ 2: How do I find the information about a certain reserved parameter from the used reserved parameter list?
Step 1 Open the EXCEL file of the used reserved parameter list. Step 2 On the Used Reserved Parameter List sheet, use the MO, Parameter ID, and BIT columns to locate the reserved parameter, which may be only a bit of a parameter. View its information, including the meaning, values, impacts, and product version in which it is activated for use. ----End
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eRAN MIMO Feature Parameter Description
8 Counters
8
Counters
The following hyperlinked EXCEL files of performance counter reference match the software version with which this document is released. l l
Node Performance Performance Counter Summary: Summary: contains device and transport transport counters. eNodeBFunction Performance Performance Counter Summary: contains all counters related to radio access functions, air interface management, access control, mobility control, and radio resourceincluding management.
You can find the EXCEL files of performance counter reference for the software version used on the live network from the product documentation delivered with that version.
FAQ: How do I find the counters related to a certain feature from performance counter reference?
Step 1 Open the EXCEL file of performance counter reference. Step 2 On the Counter Summary(En) sheet, filter the Feature ID column. Click Text Filters and choose Contains. Enter the feature ID, for example, LOFD-001016 or TDLOFD-001016.
Step 3 Click OK . All counters related to the feature are displayed. ----End
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eRAN MIMO Feature Parameter Description
9 Glossary
9
Glossary
For the acronyms, abbreviations, terms, and definitions, see Glossary Glossary..
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10 Reference Documents
10
Reference Documents
1.
3GPP 3GPP TS 36.21 36.211, 1, ""Phy Physic sical al C Chan hannel nelss an and d Modul Modulati ation" on"
2.
3GPP 3GPP T TS S 36.2 36.213, 13, "Ph "Physi ysica call la layer yer pro proced cedure ures" s"
3.
3GPP TS 36.306, 36.306, "Use "Userr Equipme Equipment nt (UE) (UE) radi radio o acces accesss capabi capabilities lities""
4.
3GPP 3GPP T TR R 36.8 36.814 14,, "P "Phy hysi sica call Laye Layerr As Aspe pect cts" s"
5. 6.
eMIMO (FDD) Hard Hardwa ware re Des Desccripti iptio on
