05_11_RA41155EN162GLA0_LTE1891_eNB_Power_Saving-Micro_DTX_FL16.pdf

Nokia Academy LTE1891 – eNB Power Saving – Micro DTX RA4115 FL16 Feature Overview

RA41155EN162GLA0

© Nokia Solutions and Networks 2016

This page contains no comments

Copyright and confidentiality The contents of this document are proprietary and confidential property of Nokia Solutions and Networks. This document is provided subject to confidentiality obligations of the applicable agreement(s). This document is intended for use of Nokia Solutions and Networks customers and collaborators only for the purpose for which this document is submitted by Nokia Solutions and Networks. No part of this document may be reproduced or made available to the public or to any third party in any form or means without the prior written permission of Nokia Solutions and Networks. This document is to be used by properly trained professional personnel. Any use of the contents in this document is limited strictly to the use(s) specifically created in the applicable agreement(s) under which the document is submitted. The user of this document may voluntarily provide suggestions, comments or other feedback to Nokia Solutions and Networks in respect of

the contents of this document ("Feedback"). Such Feedback may be used in Nokia Solutions and Networks products and related specifications or other documentation. Accordingly, if the user of this document gives Nokia Solutions and Networks feedback on the contents of this document, Nokia Solutions and Networks may freely use, disclose, reproduce, license, distribute and otherwise commercialize the feedback in any Nokia Solutions and Networks product, technology, service, specification or other documentation.

implied, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose, are made in relation to the accuracy, reliability or contents of this document. NOKIA SOLUTIONS AND NETWORKS SHALL NOT BE RESPONSIBLE IN ANY EVENT FOR ERRORS IN THIS DOCUMENT or for any loss of data or income or any special, incidental, consequential, indirect or direct damages howsoever caused, that might arise from the use of this document or any contents of this document.

Nokia Solutions and Networks operates a policy of ongoing development. Nokia Solutions and Networks reserves the right to make changes and improvements to any of the products and/or services described in this document or withdraw this document at any time without prior notice.

This document and the product(s) it describes are protected by copyright according to the applicable laws.

The contents of this document are provided "as is". Except as required by applicable law, no warranties of any kind, either express or

Nokia is a registered trademark of Nokia Corporation. Other product and company names mentioned herein may be trademarks or trade names of their respective owners. © Nokia Solutions and Networks 2016

Confidential

2

RA41155EN162GLA0

Company Confidential

© Nokia Solutions and Networks 2016

This page contains no comments

1

LTE1891 – eNB Power Saving – Micro DTX Agenda Feature Overview Configuration and Testing Test Results Operational Hints and Guidelines

4

RA41155EN162GLA0

Company Confidential

© Nokia Solutions and Networks 2016

Page: 3 Number: 1 Author: Presenter Subject: Presentation Notes Date: 2/4/2016 5:30:52 AM The LTE1891 – eNB Power Saving – Micro-DTX feature provides further energy saving of an eNB. It is obtained by switching off the cell's Power Amplifier (PA) for the duration of unused Orthogonal FrequencyDivision Multiplexing (OFDM) symbols. This power saving feature enables to save up to 40% of power in LTE cells with very low traffic or without traffic.

◄ Back

Feature Overview LTE1891 – eNB Power Saving – Micro DTX The LTE1891: eNodeB Power Saving – Micro-DTX feature introduces an option for further eNB energy saving. The mechanism used for this purpose is based on the concept of unused OFDM symbols as well as a scheduler's role in switching off the Power Amplifier (PA).

The DL scheduler monitors the OFDM symbol durations in a timespan of 40 ms (the PA must be switched on or off), collects the data into a message covering these 40 ms, and sends it to the radio frequency (RF) module. 5

RA41155EN162GLA0

Company Confidential

© Nokia Solutions and Networks 2016

This page contains no comments

1

Feature Overview LTE1891 – eNB Power Saving – Micro DTX In the LTE1891 feature, the Micro-DTX functionality allows switching off the PA of the LTE cell, for the duration of individual OFDM symbols, at times when the scheduler has determined that there is no DL signal to be sent over the air.

6

RA41155EN162GLA0

Company Confidential

© Nokia Solutions and Networks 2016

Page: 5 Number: 1 Author: Presenter Subject: Presentation Notes Date: 2/4/2016 5:30:52 AM Each LTE DL transmission is built of a sequence of Transmission Time Intervals (TTIs), each lasting 1 millisecond (ms). These so-called subframes are divided into 14 OFDM symbol durations. Even if there is no user-related data to transmit, a transmitter sends some reference signals in a well-defined OFDM symbol space within a subframe. In the LTE1891: eNodeB Power Saving – Micro-DTX feature, the Micro-DTX (discontinuous transmission) functionality allows switching off the PA of the LTE cell, for the duration of individual OFDM symbols, at times when the scheduler has determined that there is no DL signal to be sent over the air. As a result, the power consumption of the eNB is limited. This feature finds the unused OFDM symbols only at times of a very low DL load (no users connected or only few of them). The LTE1891: eNodeB Power Saving – Micro-DTX feature works for setups with a single system module (MAC) entity controlling one or more PA(s) which are serving no other cells.

1

Feature Overview LTE1891 – eNB Power Saving – Micro DTX The Micro-DTX feature operates on three time scopes: • OFDM symbol time scope with respect to PA on/off control, • TTI scope to define when DL signal (DL-S) operates or not and when OFDM symbols are muted, • 40 ms duration scope with respect to pattern selection and its ability to follow the traffic demand (the trend in DL load). Regarding the composition of activated features and parameter settings, the eNB chooses one of the following: • Using the minimum ON power-muting pattern, • Using ONE of the predefined standard-muting patterns, • Applying NO power-muting whatsoever. If any kind of muting is applied, then the LTE1891: eNodeB Power Saving – Micro-DTX feature marks all OFDM symbol durations (table cells) as NEEDS PA ON that contain mandatory transmission defined on the OFDM symbol level. 7

RA41155EN162GLA0

Company Confidential

© Nokia Solutions and Networks 2016

Page: 6 Number: 1 Author: Presenter Subject: Presentation Notes Date: 2/4/2016 5:30:53 AM The feature LTE1113 “eICIC” has introduced the concept of ABS muting patterns: they define time intervals when a macro cell is not allowed to send certain types of DL data, so the macro cell is said to be "muted". LTE1891 adds the term "power muting" which indicates that the RF power amplifier(s) of a cell are switched OFF in a specified interval of time. ABS muting patterns always cover 40 ms duration and have well-defined starting times. Power-muting patterns cover the same length of time and use the same starting times even if eICIC is not activated in the cell. The eNB shall maintain a set of two power-muting patterns, which are tables that each cover 4 radio frames (40 subframes), and contain 14 OFDM symbol positions for each subframe. The 560 elements of one such table are the candidates for "power muting", i.e. for switching off the power amplifiers if eNB can determine that no DL transmission is required in this duration. The eNB shall use table "A" for the current time interval (of 40 ms duration), and table "B" to collect the required data for the next following time interval. Once that eNB system time has reached the end of table "A", eNB shall swap the tables so that table "B" becomes the new table "A" and defines the eNB behavior, while the new table "B" shall be cleared and used to collect the data for the next following 40 ms timeframe.

1

Feature Overview LTE1891 – eNB Power Saving – Micro DTX Subframe “Power Muting Pattern” for Micro-DTX: • The minimumON pattern shall be used in situations of no load in the cell. Its application requires the raRespWinSize and the raContResoT are set such that the maximum of 8 consecutive muted subframes still allow the reception of RACH response messages – which are already fulfilled by consistency checks. • At times of very low load in the cell, either the standard20 or the standard40 muting pattern shall be used. The standard40 pattern shall be selected if siWindowLen is set to 40 and actDrx is set to falso. Otherwise, the standard20 pattern shall be used.

8

RA41155EN162GLA0

Company Confidential

© Nokia Solutions and Networks 2016

Page: 7 Number: 1 Author: Presenter Subject: Presentation Notes Date: 2/4/2016 5:30:53 AM The bits in a power-muting pattern indicate: 0 = power-saving; the power-amp is OFF and OFDM symbol or subframe is muted 1 = DL transmission; "need power-amp ON", OFDM symbol or subframe is not muted. (Note that eICIC muting patterns use the opposite convention, so for eICIC, 1 = ABS and 0 = nonABS) Each message with a power-muting pattern also contains a time stamp which indicates to the RF unit the time-span (starting radio frame number, unambiguous to an interval of at least 2 minutes) for which the muting pattern is valid. A "full-power" muting pattern has all bits set to 1. Sending no pattern at all has the same result as sending the full-power pattern, since the RF modules will perform no muting if no message is received with a valid pattern. raRespWinSize = Random Access Response Window Size parameter defines the window size for the random access response in TTIs. raContResoT = The maximum content resolution timer parameter defines the maximum amount of time allowed for contention resolution.

1

Feature Overview LTE1891 – eNB Power Saving – Micro DTX The overall SIB Scheduling concept is as follows: • MIB is transmitted at a fixed cycle (every 4 frames starting from SFN 0), • SIB1 is also transmitted at the fixed cycle (every 8 frames starting from SFN 0), • All other SIBs are being transmitted at the cycles specified by SIB scheduling information elements in SIB1.

9

RA41155EN162GLA0

Company Confidential

© Nokia Solutions and Networks 2016

Page: 8 Number: 1 Author: Presenter Subject: Presentation Notes Date: 2/4/2016 5:30:53 AM According to 3GPP 36.331, section 5.2.1.2, the MIB scheduling is as follows: The MIB uses a fixed schedule with a periodicity of 40 ms and repetitions made within 40 ms. The first transmission of the MIB is scheduled in subframe #0 of radio frames for which the SFN mod 4 = 0, and repetitions are scheduled in subframe #0 of all other radio frames. In order to make sure the SIBs are received by the UE, an SI-window is defined to enable multiple transmissions of the SI message within the window. The length of the SI-window can be set to 1, 2, 5 10, 15, 20 or 40 ms. Within an SI-window, only one SI message can be sent, and may be repeated multiple times. When a UE tries to acquire an SI message, it listens from the starting of the SI-window until the SI message is received. Reference: http://www.sharetechnote.com/html/BasicProcedure_LTE_SIB_Scheduling.html http://lteuniversity.com/get_trained/expert_opinion1/b/hongyanlei/archive/2010/09/21/lte-systeminformation-part-3.aspx

1

Feature Overview LTE1891 – eNB Power Saving – Micro DTX The Power Saving Mode is applied in the following scenarios: • A cell without any RRC-connected UE (maximum saving) or a cell with a maximum of five UEs, RRC-connected and with a low traffic volume (reduced savings), • One or more micro-DTX-capable power amplifiers are connected, • The cell bandwidth is five MHz or higher, • siWindowLen is 20 ms or 40 ms. The Power Saving Mode can be applied to OFDM symbols not using: • Common reference symbols (CRS), • Positioning reference symbols (PRS), • Downlink synchronization (PSS, SSS) channel information, • Downlink control channel information (PCFICH, PHICH, PDCCH), • PBCH (MIB) and SIB >=2, • Downlink non-UE specific information on PDSCH (SIB).

10

RA41155EN162GLA0

Company Confidential

© Nokia Solutions and Networks 2016

Page: 9 Number: 1 Author: Presenter Subject: Presentation Notes Date: 2/4/2016 5:30:53 AM Micro-DTX uses subframe patterns to define which TTIs are allowed for DL scheduling. The patterns are chosen in such a way that they cause a minimal impact on other, timing-sensitive, functions. In macro cells, they also allow straightforward cooperation with eICIC features. An O&M parameter controls the level of DL resource usage at which the transition is made between a reduced power saving and provision of full capacity.

1

Feature Overview Feature Interdependencies The following features must be deactivated before activating LTE1891: • LTE1382: Cell Resource Groups • LTE1117: LTE MBMS • LTE435: RF Sharing WCDMA-LTE • LTE447: SW Support for RF Sharing GSM-LTE • LTE1895: LTE-GSM and LTE-WCDMA RF Sharing for Dual Band Configurations • LTE471: LTE Dual Carrier Operation within One RF Band • LTE2019: Advanced Dual Carrier Operation within Same RF Unit • LTE1829: Inter-eNB RF Sharing • LTE2079: LTE-GSM RF Sharing with Full FBBC Support • LTE2080: WCDMA-GSM RF Sharing with Full FBBC Support • LTE819: DL Inter-cell Interference Generation

11

RA41155EN162GLA0

Company Confidential

© Nokia Solutions and Networks 2016

Page: 10 Number: 1 Author: Presenter Subject: Presentation Notes Date: 2/4/2016 5:30:54 AM The eNodeB Power Saving – Micro-DTX feature relies on a fast interface between the MAC and an element that controls the PA(s) associated with a cell. This interface is represented by an open-base-stationarchitecture initiative (OBSAI). In the future, new RF HW is planned to perform micro-DTX without transmitting the muting messages to the PA. The maximum permitted cable length when using OBSAI is determined by the maximum permitted singlepath delay of 80 μs. It allows an approximately 16 km cable length.

Feature Overview HW Requirements The following RF modules support micro-DTX: FHED, FHFB, FRAA, FRBE, FRBF, FRBG, FRCC, FRCG, FRGA, FRGB, FRGU, FRGY, FRHC (at least version A102), FRHF (at least version A102), FRHG, FRMC, FRME, FRMF, FRNC, FRPA, FRPB, FXED, FXEE, FRSA, FRGX, FRDC, and FXEF.

12

RA41155EN162GLA0

Company Confidential

© Nokia Solutions and Networks 2016

This page contains no comments

Management Data New Performance Measurement Counters and New BTS faults • New Counters Counter ID

Counter name

Measurement

M8010C93

Suppressed OFDM symbols with micro DTX ratio in RF module

LTE Power and Quality DL

Fault ID

Fault name

Reported Alarm

109710 / 4304

Too Long Fiber for mDTX activation

7655 (CELL NOTIFICATION)

109975 / 4308

Micro DTX configuration failure

7655 (CELL NOTIFICATION)

• New BTS faults

13

RA41155EN162GLA0

Company Confidential

© Nokia Solutions and Networks 2016

This page contains no comments

Management Data New Parameters introduced by LTE1891 • New Parameters

14

Parameter Name

Abbreviated Name

Managed Object

Activate eNode B power saving – Micro-DTX

actMicroDtx

LNCEL

Micro-DTX aggressiveness

mdtxAggressiveness

LNCEL

Number of non-muted PDCCH symbols if cell is empty

mdtxPdcchSymb

LNCEL

RA41155EN162GLA0

Company Confidential

© Nokia Solutions and Networks 2016

This page contains no comments

1

◄ Back

Configuration and Testing Activation of the LTE1891 feature

15

RA41155EN162GLA0

Company Confidential

© Nokia Solutions and Networks 2016

Page: 14 Number: 1 Author: Presenter Subject: Presentation Notes Date: 2/4/2016 5:30:54 AM Parameter name: Activate eNode B power saving - Micro DTX Parameter short name: actMicroDtx Short description: This parameter activates the feature 'eNode B power saving - Micro DTX'. Full description: It is possible to reduce power consumption by having the power amplifiers associated with a cell shut down during OFDM symbol times that are not used for any DL transmission. Managed object class: LNCEL Managed object full name: LTE BTS Cell Range: Type: Boolean Default value: false

1

Configuration and Testing Micro-DTX aggressiveness (mandatory parameter)

The “aggressiveness” parameter controls the decision whether using a standard muting pattern or applying no muting.  If the estimated PRB usage in the upcoming pattern period exceeds the value of mdtxAggressiveness, no muting will be applied in the upcoming period (Default = 0.4).

16

RA41155EN162GLA0

Company Confidential

© Nokia Solutions and Networks 2016

Page: 15 Number: 1 Author: Presenter Subject: Presentation Notes Date: 2/4/2016 5:30:54 AM Range: Type: Decimal Default value: 0.4 Minimum value: 0.1 Maximum value: 0.6 Step: 0.05 Conversion between value in SCF file and value shown in UI: Value in UI = Value in SCF file * 1 / 20 + 0

1

Configuration and Testing Number of non-muted PDCCH symbols if cell is empty (mandatory)

This parameter temporarily overrides the maxNrSymPdcch value for muted subframes, when the eNB is in the mdtxMinimumState and cell has at least 10 MHz bandwidth (Default = 3). Small values might lead to reduced PRACH performance.

17

RA41155EN162GLA0

Company Confidential

© Nokia Solutions and Networks 2016

Page: 16 Number: 1 Author: Presenter Range: Type: Decimal Default value: 3 Minimum value: 1 Maximum value: 3

Subject: Presentation Notes Date: 2/4/2016 5:30:55 AM

1

Configuration and Testing SI window length

This parameter SI Window Length defines the common System Information scheduling window for all SIs. 18

RA41155EN162GLA0

Company Confidential

© Nokia Solutions and Networks 2016

Page: 17 Number: 1 Author: Presenter Subject: Presentation Notes Date: 2/4/2016 5:30:55 AM Consistency Check:  ERROR: Parameter actMicroDtx (Activate eNode B power saving - Micro DTX) value true needs to be equal to false because parameter siWindowLen (SI window length) in object LNCEL does not match the regular expression 20ms|40ms.

Configuration and Testing Test setup • Equipment: - One eNB with an FSMF system module and a Radio Module supporting mDTX (e.g. FXEE), - (optional) UE establishing a call on the eNB (to observe power behavior), - Clamp Multimeter / Powermeter with USB and / or Bluetooth interface to a PC. • Configuration: - Enable the feature with the parameter actMicroDtx = ‘true’, - Set the other parameters (mdtxAggressiveness, mdtxPdcchSymb, siWindowLen) accordingly, - Observe the power behavior over time.

19

RA41155EN162GLA0

Company Confidential

© Nokia Solutions and Networks 2016

This page contains no comments

Configuration and Testing Test execution • Observe the eNB power behavior using the following settings: - Cell blocked, - Cell unblocked, - Micro-DTX activated / deactivated, - Change the number of non-muted PDCCH symbols, - No UE connected, - Connect a UE and produce traffic with iperf / jperf, - Let the UE go idle.

20

RA41155EN162GLA0

Company Confidential

© Nokia Solutions and Networks 2016

This page contains no comments

1

◄ Back

Test Results Results from MBB R&D Ulm

21

RA41155EN162GLA0

Company Confidential

© Nokia Solutions and Networks 2016

Page: 20 Number: 1 Author: Presenter Subject: Presentation Notes Date: 2/4/2016 5:30:56 AM Testresult from R&D Ulm: FRGY RRH RF Output power = 60 Watt Number of non-muted PDCCH symbols if cell is empty = 1 No UE connected Micro-DTX aggressiveness = 0.1 SW-Load: FL16_ENB_0000_000200_000000

This page contains no comments