eRAN
MLB Feature Parameter Description Issue
04
Date
2013-10-30
HUAWEI TECHNOLOGIES CO., LTD.
Copyright © Huawei Technologies Co., Ltd. 2013. 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.
Trademarks and Permissions and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd. All other trademarks and trade names mentioned in this document are the property of their respective holders.
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eRAN MLB Feature Parameter Description
Contents
Contents 1 About This Document..................................................................................................................1 1.1 Scope..............................................................................................................................................................................1 1.2 Intended Audience..........................................................................................................................................................1 1.3 Change History...............................................................................................................................................................1
2 Overview.........................................................................................................................................4 2.1 Basic Concepts...............................................................................................................................................................5 2.1.1 Cell Load.....................................................................................................................................................................5 2.1.2 Service Type................................................................................................................................................................5 2.1.3 Source Cell and Target Cell.........................................................................................................................................6 2.2 MLB Procedure..............................................................................................................................................................6
3 Inter-Frequency Load Balancing................................................................................................8 3.1 Load Measurement and Evaluation................................................................................................................................9 3.2 Load Information Exchange...........................................................................................................................................9 3.2.1 Neighboring Cell Selection.........................................................................................................................................9 3.2.2 Inter-eNodeB Cell Load Information Exchange........................................................................................................10 3.3 Load Balancing Decision..............................................................................................................................................10 3.4 Load Balancing Execution............................................................................................................................................11 3.5 Performance Monitoring...............................................................................................................................................12
4 Inter-RAT Load Sharing.............................................................................................................13 4.1 Load Measurement and Evaluation..............................................................................................................................14 4.2 Load Sharing Decision.................................................................................................................................................14 4.3 Load Sharing Execution...............................................................................................................................................14 4.3.1 Transferring UEs in Connected Mode.......................................................................................................................15 4.3.2 Transferring UEs in Idle Mode..................................................................................................................................16 4.4 Performance Monitoring...............................................................................................................................................16
5 Related Features...........................................................................................................................17 5.1 Features Related to LOFD-001032 Intra-LTE Load Balancing...................................................................................17 5.2 Features Related to LOFD-001044 Inter-RAT Load Sharing to UTRAN...................................................................17 5.3 Features Related to LOFD-001045 Inter-RAT Load Sharing to GERAN...................................................................18
6 Network Impact...........................................................................................................................19 Issue 04 (2013-10-30)
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eRAN MLB Feature Parameter Description
Contents
6.1 LOFD-001032 Intra-LTE Load Balancing...................................................................................................................19 6.2 LOFD-001044 Inter-RAT Load Sharing to UTRAN...................................................................................................19 6.3 LOFD-001045 Inter-RAT Load Sharing to GERAN...................................................................................................20
7 Engineering Guidelines.............................................................................................................21 7.1 When to Use MLB........................................................................................................................................................21 7.2 Required Information...................................................................................................................................................21 7.3 Planning........................................................................................................................................................................21 7.3.1 RF Planning...............................................................................................................................................................21 7.3.2 Network Planning......................................................................................................................................................22 7.3.3 Hardware Planning....................................................................................................................................................22 7.4 Deployment..................................................................................................................................................................22 7.4.1 Requirements.............................................................................................................................................................22 7.4.2 Data Preparation........................................................................................................................................................22 7.4.3 Precautions.................................................................................................................................................................32 7.4.4 Activation..................................................................................................................................................................32 7.4.5 Activation Observation..............................................................................................................................................36 7.4.6 Deactivation...............................................................................................................................................................44 7.5 Performance Monitoring...............................................................................................................................................45 7.6 Parameter Optimization................................................................................................................................................47 7.7 Troubleshooting............................................................................................................................................................47
8 Parameters.....................................................................................................................................50 9 Counters......................................................................................................................................105 10 Glossary.....................................................................................................................................108 11 Reference Documents.............................................................................................................109
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eRAN MLB Feature Parameter Description
1 About This Document
1
About This Document
1.1 Scope This document describes mobility load balancing (MLB), including its technical principles, related features, network impact, and engineering guidelines. This document covers the following features: l
LOFD-001032 Intra-LTE Load Balancing
l
LOFD-001044 Inter-RAT Load Sharing to UTRAN
l
LOFD-001045 Inter-RAT Load Sharing to GERAN
Any managed objects (MOs), parameters, alarms, or counters described herein correspond to the software release delivered with this document. Any future updates will be described in the product documentation delivered with future software releases. This document applies only to LTE FDD. Any "LTE" in this document refers to LTE FDD, and "eNodeB" refers to LTE FDD eNodeB.
1.2 Intended Audience This document is intended for personnel who: l
Need to understand the features described herein
l
Work with Huawei products
1.3 Change History This section provides information about the changes in different document versions. There are two types of changes, which are defined as follows: l
Feature change Changes in features of a specific product version
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eRAN MLB Feature Parameter Description
1 About This Document
Changes in wording or addition of information that was not described in the earlier version
04 (2013-10-30) This issue includes the following changes. Change Type
Change Description
Parameter Change
Feature change
None
None
Editorial change
Revised 3.4 Load Balancing Execution and 4.3.1 Transferring UEs in Connected Mode.
None
03 (2013-08-30) This issue includes the following changes. Change Type
Change Description
Parameter Change
Feature change
In inter-RAT load sharing to UTRAN, deleted the exchange of load information about neighboring UTRAN cells through RAN Information Management (RIM) procedures.
None
Editorial change
None
None
02 (2012-05-31) This issue includes the following changes. Change Type
Change Description
Parameter Change
Feature change
None
None
Editorial change
Optimized some descriptions in 7.4.2 Data Preparation and 7.4.4 Activation.
None
01 (2013-04-28) This issue includes the following changes.
Issue 04 (2013-10-30)
Change Type
Change Description
Parameter Change
Feature change
None
None
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eRAN MLB Feature Parameter Description
1 About This Document
Change Type
Change Description
Parameter Change
Editorial change
Optimized the descriptions of types of services that trigger inter-frequency load balancing and inter-RAT load sharing. For details, see 3 Inter-Frequency Load Balancing and 4 Inter-RAT Load Sharing.
None
Draft A (2013-01-30) Compared with Issue 05 (2012-12-29) of eRAN3.0, Draft A (2013-01-30) of eRAN6.0 includes the following changes. Change Type
Change Description
Parameter Change
Feature change
In inter-RAT load sharing to UTRAN, added the exchange of load information about neighboring UTRAN cells through RIM procedures.
Added the MlbLoadInfoSwitch (MlbLoadInfoSwitch) option to the CellAlgoSwitch.MlbAlgoSwitch parameter.
Removed intra-frequency load balancing.
Removed the parameters for intrafrequency load balancing.
Added the switches of blind handover for inter-frequency and inter-RAT MLB. For details, see 3.4 Load Balancing Execution and 4.3.1 Transferring UEs in Connected Mode.
Added the CellAlgoSwitch.MlbHoMode parameter.
Added the configuration of the number of UEs that can be transferred in an MLB period. For details, see 3.4 Load Balancing Execution.
Added the CellMLB.LoadTransferFactor parameter.
Revised the description of interRAT load sharing.
None
Editorial change
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eRAN MLB Feature Parameter Description
2 Overview
2
Overview
Mobility load balancing (MLB) coordinates load distribution among inter-frequency cells to maximize network resource usage. To achieve these goals, MLB checks the load status of cells, exchanges cell load information, and transfers load from heavily loaded cells to lightly loaded cells. In addition, MLB can transfer load to inter-RAT cells to reduce the E-UTRAN congestion rate, increase the access success rate, and improve user experience with services. NOTE
RAT is short for radio access technology.
MLB can be classified into inter-frequency load balancing and inter-RAT load sharing. MLB involves the following optional features: l
LOFD-001032 Intra-LTE Load Balancing
l
LOFD-001044 Inter-RAT Load Sharing to UTRAN
l
LOFD-001045 Inter-RAT Load Sharing to GERAN
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eRAN MLB Feature Parameter Description
2 Overview
2.1 Basic Concepts 2.1.1 Cell Load MLB considers the following types of loads: air interface load, hardware load, and transport network layer load, as shown in Figure 2-1. Figure 2-1 Different types of loads and their positions
l
The air interface load is represented by the uplink (UL) and DL PRB usages in each cell. For details about how to calculate the PRB usage, see section 4.1.1 in 3GPP TS 36.314 V10.2.0 (2011-09).
l
The hardware load is represented by the hardware resource usage, such as the central processing unit (CPU) and digital signal processing (DSP) hardware usage.
l
The transport network layer load is represented by the S1 bandwidth usage. For details, see Transport Resource Management Feature Parameter Description.
According to section 9.2.36 in 3GPP TS 36.423 V10.5.0 (2012-03), the hardware and transport network layer loads can be in one of the following states: LowLoad, MediumLoad, HighLoad, and Overload. 3900 series eNodeBs currently support only MLB triggered by the air interface load. In RAN sharing scenarios, cell load is measured on a per cell basis, not on a per operator basis. NOTE
For concepts related to RAN sharing, see RAN Sharing Feature Parameter Description.
2.1.2 Service Type Services are categorized into guaranteed bit rate (GBR) services and non-GBR services in the uplink and downlink. The GBR services and non-GBR services combined are referred to as total Issue 04 (2013-10-30)
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eRAN MLB Feature Parameter Description
2 Overview
services. In MLB, the eNodeB determines the load balancing type based on the percentage of resources occupied by each type of service.
2.1.3 Source Cell and Target Cell A source cell is the cell from which MLB transfers the load. In this document, a source cell is also referred to as a serving cell. A target cell is a neighboring cell to which MLB transfers the load.
2.2 MLB Procedure MLB can be performed between inter-frequency and inter-RAT cells. A cell can be configured with one or both of the two types of neighboring cells. When both types are configured, the type of neighboring cells to which the load should be transferred is determined by the settings of the associated switches and MLB thresholds. If the switches for both of them are turned on, the two types of MLB can coexist. It is recommended that the threshold for inter-frequency load balancing be set to a smaller value than the threshold for inter-RAT load sharing so that interfrequency load balancing takes precedence over inter-RAT load sharing. Load balancing may be triggered by an overload in the uplink or downlink. For details about how to configure MLB, see 7 Engineering Guidelines. The MLB procedure consists of the following steps: 1.
Load measurement and evaluation The eNodeB periodically measures the resources occupied by the uplink and downlink GBR services and non-GBR services. Based on these measurement results, the eNodeB evaluates the cell load.
2.
Load information exchange (only applicable to inter-frequency load balancing) If an MLB switch is turned on for a cell, the cell initiates a resource status request towards its neighboring cells when the uplink and downlink loads of the cell meet the MLB triggering condition. In this scenario, the cell exchanges the load information with its neighboring cells.
3.
MLB decision l For inter-frequency load balancing, the eNodeB selects the best candidate cell as the target cell. The selection is based on the load difference between the serving cell and the candidate cells and the historical statistics on the performance of handovers from the serving cell to the candidate cells. l The eNodeB determines whether to perform load sharing with UTRAN or GERAN based on the MLB switch settings on the eNodeB. If the switches for load sharing with UTRAN and GERAN are turned on, the eNodeB may select UEs for load sharing to UTRAN or GERAN neighboring cells.
4.
MLB execution After the target cell for MLB is determined, the serving cell selects several UEs to transfer. The transfer method may be handover or cell reselection. If UEs do not support inter-RAT handover, the serving cell transfers UEs using redirections.
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eRAN MLB Feature Parameter Description
2 Overview
After executing MLB, the eNodeB monitors the performance of the source and target cells. The performance serves as a basis for the next selection of a target cell for MLB.
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eRAN MLB Feature Parameter Description
3 Inter-Frequency Load Balancing
3
Inter-Frequency Load Balancing
This chapter describes the optional feature LOFD-001032 Intra-LTE Load Balancing. Inter-frequency load balancing transfers some UEs in connected mode to balance load between inter-frequency neighboring cells. This feature applies to inter-frequency cells with the same coverage or with a large proportion of overlapping coverage. Therefore, inter-frequency load balancing takes into consideration all the UEs in connected mode in a cell. Inter-frequency load balancing is enabled if the InterFreqMlbSwitch(InterFreqMlbSwitch) option of the CellAlgoSwitch.MlbAlgoSwitch parameter is selected. The following sections describe the procedure for inter-frequency load balancing.
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eRAN MLB Feature Parameter Description
3 Inter-Frequency Load Balancing
3.1 Load Measurement and Evaluation The eNodeB periodically measures cell resources in use and compares the result with the specified MLB threshold. Load information exchange is triggered for inter-frequency load balancing if the air interface load of a cell is consistently equal to or greater than the sum of CellMLB.InterFreqMlbThd (the threshold above which inter-frequency load balancing is started) and CellMLB.LoadOffset. Load balancing is preferentially triggered by GBR services, then by total services. If the PRB usage of GBR services is greater than the specified threshold, load balancing is triggered by GBR services. If the PRB usage of GBR services is less than the specified threshold but the PRB usage of total services is greater than the specified threshold, load balancing is triggered by total services. Services that trigger load balancing are treated separately in the uplink and downlink. Load offset is used to prevent load fluctuations from frequently triggering and stopping load balancing. Load information exchange is stopped if the PRB usage of the serving cell is consistently less than the value of CellMLB.InterFreqMlbThd .
3.2 Load Information Exchange If the cell has at least one inter-frequency neighboring cell under the same eNodeB, the eNodeB will perform inter-frequency load balancing only to these intra-eNodeB inter-frequency neighboring cells. The serving cell can acquire the load status of these cells directly (not through the X2 interface) before making a load balancing decision. If the cell does not have any inter-frequency neighboring cells under the same eNodeB, the serving cell initiates a resource status request towards the neighboring cells on a specified list to exchange load information. The load information consists of the air interface, hardware, and transport network layer loads. The air interface load is represented by the total PRB usage, PRB usage of GBR services, and PRB usage of non-GBR services in the uplink or downlink in each cell. NOTE
Inter-eNodeB cells exchange load information through the X2 interface. If the X2 interface is not configured, load information cannot be exchanged between the cells, and therefore the subsequent activities are not performed.
3.2.1 Neighboring Cell Selection All inter-frequency neighboring cells can be candidate cells. After filtering out certain cells, the eNodeB generates a list of neighboring cells for load information exchange. The following are examples of cells that the eNodeB filters out: l
Cells under a neighboring eNodeB to which the local eNodeB is not connected through an X2 interface
l
Cells with a handover success rate less than 98%
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eRAN MLB Feature Parameter Description
l
3 Inter-Frequency Load Balancing
Cells for which the EutranInterFreqNCell.NoHoFlag parameter is set to FORBID_HO_ENUM(Forbid Ho)
3.2.2 Inter-eNodeB Cell Load Information Exchange After determining the inter-eNodeB cells with which the serving cell can exchange load information, the eNodeB sends a RESOURCE STATUS REQUEST message to all the eNodeBs to which the inter-eNodeB cells belong. The message contains the IDs of the inter-eNodeB cells whose load information is requested and the interval at which the cell load information should be reported. For details, see section 8.3.6 in 3GPP TS 36.423 V10.5.0 (2012-03). The serving cell requests all candidate cells to report their load information. If the serving cell receives a RESOURCE STATUS RESPONSE message from a neighboring cell, the serving cell will periodically receive subsequent RESOURCE STATUS UPDATE messages from that neighboring cell. If the serving cell receives a RESOURCE STATUS FAILURE message from a neighboring cell, the neighboring cell is not considered a qualified candidate for load balancing at present. NOTE
If a neighboring cell stops reporting RESOURCE STATUS UPDATE messages after several reports, the cell is not considered as a candidate cell at present.
3.3 Load Balancing Decision The eNodeB generates a target cell list for inter-frequency load balancing based on the load differences between the cells, handover performance, and the load information exchange results. After load information exchange, the eNodeB derives a preliminary candidate cell list based on factors such as cell bandwidth differences and the uplink or downlink resources occupied by GBR and total services. Then, the eNodeB generates a target cell list by removing the neighboring cells that meet any of the following conditions: l
The success rate of handovers from the serving cell to the neighboring cell is less than 98%.
l
The TNL load or hardware load of the neighboring cell is in the HighLoad or Overload state.
l
Between the neighboring and serving cells, services in the uplink or downlink that trigger load balancing is less than the value of CellMLB.LoadDiffThd.
If the target cell list is empty, the eNodeB stops load balancing for the serving cell. NOTE
In RAN sharing scenarios, a neighboring cell can be the target cell regardless of whether the cell operates in RAN sharing with common carriers mode or in RAN sharing with dedicated carriers mode. It is recommended that the CellMLB.InterFreqMlbThd parameter be set to the same value throughout the network. The target cell may be so heavily loaded that load balancing from the target cell to other cells is also triggered in the same direction (uplink or downlink) as load balancing from the source cell. In this situation, load balancing from the source cell to the target cell is still performed as long as the target cell meets the load balancing condition.
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eRAN MLB Feature Parameter Description
3 Inter-Frequency Load Balancing
3.4 Load Balancing Execution Inter-frequency load balancing involves only UEs in connected mode. The eNodeB selects some UEs that do not support carrier aggregation (called non-CA UEs) based on the frequency information about the target cells, frequency capabilities of UEs, PRB usage in the target cells, and type of services that trigger load balancing in the serving cell. Then, the eNodeB instructs the UEs to transfer to the target cells. If load balancing is triggered by GBR services, the eNodeB selects the UEs that are performing GBR services. If the load balancing is triggered by total services, the eNodeB selects UEs that are performing non-GBR services. In addition, the eNodeB considers both the uplink and downlink PRB usages of UEs during UE selection for load balancing. That is, the uplink and downlink PRB usages of the UEs that are selected by the eNodeB must meet certain conditions. This prevents ping-pong load balancing in the transmission direction opposite to the MLB-triggering direction after the UEs are transferred to the neighboring cell. If uplink or downlink PRB usage of the selected UEs is too large, load balancing is likely to be triggered in the uplink or downlink of the target cell. If the uplink or downlink PRB usage of the selected UEs is too small, the load of the source cell may not be reduced in time. For example, if load balancing is triggered by GBR services in the downlink, the eNodeB selects the UEs that meet the following conditions for load balancing: l
The PRB usage of downlink GBR services is greater than 2% and less than or equal to half of the value of the CellMLB.LoadDiffThd parameter.
l
The PRB usage of uplink GBR services is less than or equal to 2%.
This prevents load balancing triggered by GBR services in the uplink after the UEs are transferred to the neighboring cell. In inter-frequency load balancing, there are two methods to transfer UEs that support interfrequency handover: blind handover and measurement-based handover. Measurement-based handovers work by default, and in this case it is required that the RSRP of target inter-frequency cells must be greater than the value of the InterFreqHoGroup.InterFreqLoadBasedHoA4ThdRsrp parameter. Blind handovers work only if the InterFreqMlbBlindHo(InterFreqMlbBlindHo) option of the CellAlgoSwitch.MlbHoMode parameter is selected. NOTE
The total number of RBs in a cell used by the UEs to be transferred within an inter-frequency load balancing process cannot exceed the maximum number, which is calculated based on the PRB usage difference between the source and target cells and the CellMLB.LoadTransferFactor parameter. A greater PRB usage difference or a larger value of the CellMLB.LoadTransferFactor parameter produces a larger total number of RBs in a cell used by the UEs to be transferred within an inter-frequency load balancing process. A UE is considered as a CA UE regardless of whether the UE is in its secondary serving cell (SCell) or primary serving cell (PCell).
During inter-frequency load balancing, the serving cell rejects incoming handover requests with the cause value "Resource optimisation handover". NOTE
For definitions of the cause values for handover requests, see section 9.2.1.3 in 3GPP TS 36.413 V10.6.0 (2012-06) and section 9.2.6 in 3GPP TS 36.423 V11.1.0 (2012-06).
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eRAN MLB Feature Parameter Description
3 Inter-Frequency Load Balancing
Based on the measurement results reported by the UEs, the eNodeB performs inter-frequency handovers for UEs that meet the handover conditions. For details about inter-frequency handovers, see Mobility Management in Connected Mode Feature Parameter Description. NOTE
The EPC sends an SPID to the eNodeB when a UE accesses the network. The subscriber profile identified by the SPID includes the mobility and service usage information to which the UE subscribes. The operators' network plan determines subscriber profiles. For details about SPIDs, see section 8.6.2.2 in 3GPP TS 36.413 V10.6.0 (2012-06) and section 16.1.8 and Annex I in 3GPP TS 36.300 V11.2.0 (2012-06). The UE will be transferred only to the RATs or frequencies specified in the SPID configuration if the following conditions are met: l The UE is to be transferred and the eNodeB has learned the UE's SPID from the EPC. l The SpidCfg MO corresponding to this SPID has been configured on the eNodeB with the SpidCfg.InterFreqMlbSwitch parameter set to TRUE(TRUE).
3.5 Performance Monitoring Self-organizing network (SON) logs record the following information during a load balancing period: l
Total number of UEs that are handed over to target cells and UEs whose RRC connections are reestablished with the target cells because of radio link failures during handovers
l
Total PRB usage
Operators can query the SON logs for the statistics on load balancing within each period. The eNodeB monitors the success rate of handovers from the source cell. In the next round of load measurement and evaluation, the handover success rate is considered as an evaluation standard for selecting target cells for inter-frequency load balancing.
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eRAN MLB Feature Parameter Description
4 Inter-RAT Load Sharing
4
Inter-RAT Load Sharing
This chapter describes the optional features LOFD-001044 Inter-RAT Load Sharing to UTRAN and LOFD-001045 Inter-RAT Load Sharing to GERAN. The decision on inter-RAT load sharing is based on the load of an E-UTRAN cell. If an EUTRAN cell becomes heavily loaded, the eNodeB can trigger inter-RAT load sharing based on UE capabilities, load statistics of the target inter-RAT network, and system performance. After triggering inter-RAT load sharing, the eNodeB takes one or both of the following actions: l
Transfers some UEs in connected mode to the target cell.
l
Instructs some UEs to camp on the target cell after their Radio Resource Control (RRC) connections are released (when the UEs enter idle mode).
The following sections describe the inter-RAT load sharing procedure.
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eRAN MLB Feature Parameter Description
4 Inter-RAT Load Sharing
4.1 Load Measurement and Evaluation The eNodeB periodically measures cell resources in use and compares the result with the specified MLB threshold. Inter-RAT load sharing is triggered if both the following conditions are met: l
The cell load is consistently greater than or equal to the sum of CellMLB.InterRatMlbThd and CellMLB.LoadOffset.
l
The number of uplink synchronized UEs in the cell is greater than or equal to CellMLB.InterRatMlbUeNumThd.
The same rules that determine the service type for triggering inter-frequency load balancing (described in 3.1 Load Measurement and Evaluation) apply to inter-RAT load sharing. Inter-RAT load sharing is stopped if the load of the serving cell is consistently less than the value of CellMLB.InterRatMlbThd or the number of uplink synchronized UEs in the serving cell is consistently less than the value of CellMLB.InterRatMlbUeNumThd.
4.2 Load Sharing Decision In inter-RAT load sharing, the eNodeB selects the target RAT based on the MLB switch settings in the CellAlgoSwitch.MlbAlgoSwitch parameter. l
If the UtranMlbSwitch(UtranMlbSwitch) option of the CellAlgoSwitch.MlbAlgoSwitch parameter and the UtranPsHoSwitch (UtranPsHoSwitch) option of the EnodebAlgoSwitch.HoModeSwitch parameter are selected, the eNodeB will select UEs in connected mode for load sharing to UTRAN cells.
l
If the UtranIdleMlbSwitch(UtranIdleMlbSwitch) option of the CellAlgoSwitch.MlbAlgoSwitch parameter is selected, the eNodeB will select UEs in idle mode for load sharing to UTRAN cells.
l
If the GeranMlbSwitch(GeranMlbSwitch) option of the CellAlgoSwitch.MlbAlgoSwitch parameter and the GeranPsHoSwitch (GeranPsHoSwitch) option of the EnodebAlgoSwitch.HoModeSwitch parameter are selected, the eNodeB will select UEs for load sharing to GERAN cells.
If the switches for load sharing with UTRAN and GERAN are turned on, the eNodeB may select UEs for load sharing to UTRAN or GERAN neighboring cells.
4.3 Load Sharing Execution During inter-RAT load sharing, the serving cell rejects incoming handover requests with the cause value "Resource optimisation handover". NOTE
For definitions of the cause values for handover requests, see section 9.2.1.3 in 3GPP TS 36.413 V10.6.0 (2012-06) and section 9.2.6 in 3GPP TS 36.423 V11.1.0 (2012-06).
The following sections describe the principles of transferring UEs in connected mode and idle mode. Issue 04 (2013-10-30)
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eRAN MLB Feature Parameter Description
4 Inter-RAT Load Sharing
4.3.1 Transferring UEs in Connected Mode The eNodeB instructs a number of UEs to perform inter-RAT measurements based on the information about the target cells, frequencies and RAT capabilities of UEs, PRB usage in the source cell, and the type of services that trigger load sharing, when either of the following option combination is selected: l
UtranMlbSwitch(UtranMlbSwitch) of the CellAlgoSwitch.MlbAlgoSwitch parameter and UtranPsHoSwitch(UtranPsHoSwitch) of the EnodebAlgoSwitch.HoModeSwitch parameter
l
GeranMlbSwitch(GeranMlbSwitch) of the CellAlgoSwitch.MlbAlgoSwitch parameter and GeranPsHoSwitch(GeranPsHoSwitch) of the EnodebAlgoSwitch.HoModeSwitch parameter
If load sharing is triggered by GBR services, the eNodeB selects UEs that are performing GBR services and sends Measurement Configuration messages to these UEs. Alternatively, if load sharing is triggered by total services, the eNodeB selects UEs that are performing non-GBR services and sends Measurement Configuration messages to those UEs. In addition, the eNodeB considers both the uplink and downlink PRB usages of UEs during UE selection for load sharing. That is, the uplink and downlink PRB usages of the UEs that are selected by the eNodeB must meet certain conditions. This prevents ping-pong load sharing in the transmission direction opposite to the MLB-triggering direction after the UEs are transferred to the neighboring cell. If uplink or downlink PRB usage of the selected UEs is too large, load sharing is likely to be triggered in the uplink or downlink of the target cell. If the uplink or downlink PRB usage of the selected UEs is too small, the load of the source cell may not be reduced in time. For example, if load sharing is triggered by GBR services in the downlink, the eNodeB selects the UEs that meet the following conditions for load sharing: l
The PRB usage of downlink GBR services is greater than 2% and less than or equal to half of the value of the CellMLB.LoadDiffThd parameter.
l
The PRB usage of uplink GBR services is less than or equal to 2%.
This prevents load sharing triggered by GBR services in the uplink after the UEs are transferred to the neighboring cell. Based on the measurement results reported by the UEs, the eNodeB determines the target UEs for load sharing. The E-UTRAN cell transfers the selected UEs to the target cell for inter-RAT load sharing based on inter-RAT handover policies. In inter-RAT load sharing, there are two methods to transfer UEs that support inter-RAT handover: blind handover and measurement-based handover. Measurement-based handovers work by default, and in this case it is required that the received signal code power (RSCP) of target UTRAN cells for load sharing must be greater than the value of the InterRatHoUtranGroup.LdSvBasedHoUtranB1ThdEcn0 parameter or the received signal strength indicator (RSSI) of target GERAN cells for load sharing must be greater than the value of the InterRatHoGeranGroup.LdSvBasedHoGeranB1Thd parameter. Blind handovers work only if the InterRatMlbBlindHo(InterRatMlbBlindHo) option of the CellAlgoSwitch.MlbHoMode parameter is selected. If UEs do not support inter-RAT handover, the eNodeB transfers UEs by blind redirections. Handover is the preferred method for the eNodeB to perform load sharing, because the use of redirection interrupts services. The eNodeB performs load sharing only if handover is enabled. Issue 04 (2013-10-30)
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4 Inter-RAT Load Sharing
If handover is enabled but the UEs do not support handover, the eNodeB performs redirections for load sharing. For details about the description of inter-RAT handover, see Mobility Management in Connected Mode Feature Parameter Description. NOTE
The EPC sends an SPID to the eNodeB when a UE accesses the network. The subscriber profile identified by the SPID includes the mobility and service usage information to which the UE subscribes. The operators' network plan determines subscriber profiles. For details about SPIDs, see section 8.6.2.2 in 3GPP TS 36.413 V10.6.0 (2012-06) and section 16.1.8 and Annex I in 3GPP TS 36.300 V11.2.0 (2012-06). The UE will be transferred only to the RATs or frequencies specified in the SPID configuration if the following conditions are met: l The UE is to be transferred and the eNodeB has learned the UE's SPID from the EPC. l The SpidCfg MO corresponding to this SPID has been configured on the eNodeB with the SpidCfg.InterRatMlbSwitch parameter set to TRUE(TRUE).
4.3.2 Transferring UEs in Idle Mode If the UtranIdleMlbSwitch(UtranIdleMlbSwitch) option of the CellAlgoSwitch.MlbAlgoSwitch parameter is selected for an E-UTRAN cell and the E-UTRAN cell meets the conditions for triggering inter-RAT load sharing, the eNodeB instructs several UEs that are undergoing RRC connection release procedures to camp on the target UTRAN cell after their RRC connections are released. The eNodeB delivers the instructions by including the CellReselectionPriority IE in the RRCConnectionRelease messages to the UEs. The actual duration of load sharing with UTRAN is calculated based on the value of the CellMLB.InitValidPeriod parameter and the number of uplink synchronized UEs. The CellMLB.InitValidPeriod parameter specifies the initial duration of load sharing with UTRAN for UEs in idle mode, and the actual duration increases with the number of uplink synchronized UEs. Therefore, the larger the value of the CellMLB.InitValidPeriod parameter or the number of uplink synchronized UEs, the larger the actual duration of load sharing with UTRAN. Within the time of actual duration, UEs preferentially camp on neighboring UTRAN cells if the UEs are to be released after the inactive timer expires. Load sharing with UTRAN for UEs in idle mode takes effect only if the priorities of the serving frequency and the neighboring E-UTRAN frequencies of the serving cell are all higher than or all lower than those of the neighboring UTRAN frequencies of the serving cell.
4.4 Performance Monitoring SON logs record the following information during a load sharing period: l
Number of UEs that are handed over to target cells
l
Number of UEs whose RRC connections are reestablished with the target cells because of radio link failures during handovers
l
Total PRB usage
Operators can query the SON logs for the statistics on load sharing within each period.
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5 Related Features
5
Related Features
5.1 Features Related to LOFD-001032 Intra-LTE Load Balancing Prerequisite Features None
Mutually Exclusive Features None
Impacted Features None
5.2 Features Related to LOFD-001044 Inter-RAT Load Sharing to UTRAN Prerequisite Features The Inter-RAT Load Sharing to UTRAN feature depends on LOFD-001019 PS Inter-RAT Mobility between E-UTRAN and UTRAN.
Mutually Exclusive Features None
Impacted Features None Issue 04 (2013-10-30)
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5.3 Features Related to LOFD-001045 Inter-RAT Load Sharing to GERAN Prerequisite Features The Inter-RAT Load Sharing to GERAN feature depends on LOFD-001020 PS Inter-RAT Mobility between E-UTRAN and GERAN.
Mutually Exclusive Features None
Impacted Features None
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6 Network Impact
6
Network Impact
6.1 LOFD-001032 Intra-LTE Load Balancing System Capacity The Intra-LTE Load Sharing feature transfers some load from an E-UTRAN cell to intra-RAT neighboring cells before the source E-UTRAN cell becomes congested, and, therefore, increases resource usage and system capacity.
Network Performance The Intra-LTE Load Balancing feature increases the number of intra-LTE handovers.
6.2 LOFD-001044 Inter-RAT Load Sharing to UTRAN System Capacity The Inter-RAT Load Sharing to UTRAN feature transfers some load from an E-UTRAN cell to neighboring UTRAN cells before the source E-UTRAN cell becomes congested, and, therefore, decreases the E-UTRAN load and improves the user experience of UEs in E-UTRAN. However, this feature increases the UTRAN load and negatively affects the user experience of UEs in UTRAN.
Network Performance The Inter-RAT Load Sharing to UTRAN feature increases the number of inter-RAT handovers from E-UTRAN to UTRAN and the value of the L.RRC.ConnReq.Att.MoSig counter in the source cell.
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6.3 LOFD-001045 Inter-RAT Load Sharing to GERAN System Capacity The Inter-RAT Load Sharing to GERAN feature transfers some load from an E-UTRAN cell to neighboring GERAN cells before the source E-UTRAN cell becomes congested, and, therefore, decreases the E-UTRAN load and improves the user experience of UEs in E-UTRAN. However, this feature increases the GERAN load and negatively affects the user experience of UEs in GERAN.
Network Performance The Inter-RAT Load Sharing to GERAN feature increases the number of inter-RAT handovers from E-UTRAN to GERAN and the value of the L.RRC.ConnReq.Att.MoSig counter in the source cell.
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Engineering Guidelines
7.1 When to Use MLB Use inter-frequency load balancing when one of the following conditions is met: l
Inter-frequency cells provide the same coverage.
l
Inter-frequency cells have a large proportion of overlapping coverage.
l
The coverage of a cell contains that of another inter-frequency cell.
Use inter-RAT load sharing if multi-mode base stations are used or base stations of different RATs provide contiguous coverage.
7.2 Required Information Collect the following information: l
Information about each neighboring cell of the cells under the local eNodeB – Whether information about the neighboring cell is complete – Whether the neighboring cell has been blacklisted – Whether the No Handover attribute is set to prohibit handovers to the neighboring cell
l
Status of the X2 interfaces with neighboring eNodeBs
l
UE capabilities The proportion of UEs that support inter-frequency or inter-RAT measurements
7.3 Planning 7.3.1 RF Planning MLB is implemented by handover and reselection. Therefore, the current network coverage must meet the following UE mobility requirements: Issue 04 (2013-10-30)
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l
No holes exist in the coverage.
l
Overshoot coverage is minimized.
l
Pilot pollution is minimized. Pilot pollution occurs if the preambles used by different cells under one eNodeB conflict.
l
Uplink and downlink imbalances are minimized.
7.3.2 Network Planning N/A
7.3.3 Hardware Planning N/A
7.4 Deployment 7.4.1 Requirements There are no requirements for the operating system and transmission networking. Before deploying MLB, the operator must purchase and activate the licenses for the features listed in Table 7-1. Table 7-1 License information for MLB Feature ID
Feature Name
License Control Item Name
NE
Sales Unit
LOFD-001032
Intra-LTE Load Balancing
Intra-LTE Load Balancing
eNodeB
per RRC Connected User
LOFD-001044
Inter-RAT Load Sharing to UTRAN
Inter-RAT Load Sharing to UTRAN
eNodeB
per RRC Connected User
LOFD-001045
Inter-RAT Load Sharing to GERAN
Inter-RAT Load Sharing to GERAN
eNodeB
per RRC Connected User
7.4.2 Data Preparation This section describes the data that you need to collect for setting parameters. Required data is data that you must collect for all scenarios. Collect scenario-specific data when necessary for a specific feature deployment scenario. There are three types of data sources: Issue 04 (2013-10-30)
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l
Network plan (negotiation required): parameter values planned by the operator and negotiated with the EPC or peer transmission equipment
l
Network plan (negotiation not required): parameter values planned and set by the operator
l
User-defined: parameter values set by users
Required Data The following table describes the parameters that must be set in the CellMLB managed object (MO) to configure MLB algorithms. Parameter Name
Parameter ID
Data Source
Setting Notes
Load Offset
CellMLB. LoadOffset
Network plan (negotiation not required)
This parameter specifies an offset applied to the threshold value for triggering MLB. MLB is triggered only when the load is consistently equal to or greater than the sum of the threshold and offset values. This mechanism helps prevent load fluctuations from frequently triggering and stopping MLB. The recommended value is 8.
Load Difference Threshold
CellMLB. LoadDiffThd
Network plan (negotiation not required)
This parameter specifies the minimum load difference between two cells that triggers MLB. When the load difference between two cells exceeds the value of this parameter, the eNodeB regards the load as imbalanced and triggers MLB between the two cells. When the load difference between these cells drops below this threshold, the eNodeB no longer regards the load as imbalanced and stops MLB between the cells. This parameter also specifies the maximum PRB usage of UEs selected for inter-RAT load sharing. The recommended value is 15.
The following table describes the parameter that must be set in the InterFreqHoGroup MO to configure inter-frequency handover. Issue 04 (2013-10-30)
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Parameter Name
Parameter ID
Data Source
Setting Notes
Load Based Interfreq RSRP threshold
InterFreqHoG roup. InterFreqLoad BasedHoA4Th dRsrp
Network plan (negotiation not required)
This parameter specifies the RSRP threshold for event A4 related to load-based interfrequency handover. When the measured RSRP value exceeds this threshold, event A4 is reported. The default value is -103.
The following table describes the parameter that must be set in the InterRatHoUtranGroup MO to configure inter-RAT handover to UTRAN. Parameter Name
Parameter ID
Data Source
Setting Notes
Load Service Based UTRAN EventB1 RSCP trigger threshold
InterRatHoUtranGroup. LdSvBasedHo UtranB1ThdR scp
Network plan (negotiation not required)
This parameter specifies the RSCP threshold for event B1 related to load- or service-based inter-RAT handover to UTRAN.
d
In inter-RAT handover to UTRAN, this parameter specifies the requirement for RSCP of the target UTRAN cell. When the measured RSCP exceeds this threshold, a measurement report will be sent. The recommended value is -101.
The following table describes the parameters that must be set in the InterRatHoGeranGroup MO to configure inter-RAT handover to GERAN.
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Parameter Name
Parameter ID
Data Source
Setting Notes
Load Service Based Geran EventB1 trigger threshold
InterRatHoGe ranGroup. LdSvBasedHo GeranB1Thd
Network plan (negotiation not required)
This parameter specifies the RSSI threshold for event B1 related to load- or service-based inter-RAT handover to GERAN. When the measured RSSI exceeds this threshold, event B1 will be reported. The recommended value is -98.
Scenario-specific Data Scenario 1: Inter-Frequency Load Balancing The following table describes the parameters that must be set in the CellAlgoSwitch MO to enable the inter-frequency load balancing algorithm. Parameter Name
Parameter ID
Data Source
Setting Notes
Local cell ID
CellAlgoSwitch. LocalCellId
Network plan (negotiation not required)
This parameter specifies the local ID of a cell. It uniquely identifies the cell within an eNodeB. The actual value range is 0 to 17.
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Parameter Name
Parameter ID
Data Source
Setting Notes
Load balancing algorithm switch
CellAlgoSwitch. MlbAlgoSwitch
Network plan (negotiation not required)
The InterFreqMlbSwitch (InterFreqMlbSwitch) check box under this parameter specifies whether to enable the interfrequency load balancing algorithm. l If InterFreqMlbSwitch (InterFreqMlbS witch) is selected, the algorithm is enabled. l If InterFreqMlbSwitch (InterFreqMlbS witch) is not selected, the algorithm is disabled.
The following table describes the parameters that must be set in the CellMLB MO to configure the inter-frequency load balancing algorithm. Parameter Name
Parameter ID
Data Source
Setting Notes
Local cell ID
CellMLB. LocalCellId
Network plan (negotiation not required)
This parameter specifies the local ID of a cell. It uniquely identifies the cell within an eNodeB. The actual value range is 0 to 17.
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Parameter Name
Parameter ID
Data Source
Setting Notes
Inter-Frequency Mobility Load Balancing Threshold
CellMLB. InterFreqMlb Thd
Network plan (negotiation not required)
This parameter specifies the threshold for inter-frequency load balancing. Inter-frequency load balancing is started when the load exceeds the sum of this threshold and the load offset. Interfrequency load balancing is stopped when the load drops below this threshold. The default value is 60. It is recommended that this parameter be set to the same value throughout the network.
CellMLB. LoadTransfer Factor
Load Transfer Factor
Network plan (negotiation not required)
This parameter specifies the factor used to control the amount of load transferred during a single MLB procedure. The value of this parameter has an impact on the efficiency of the MLB algorithm and the algorithm to prevent pingpong load transfer. A larger value of this parameter leads to the situation where a larger amount of load can be transferred, and a smaller value leads to the situation where a smaller amount of load can be transferred. The recommended value is 0.
(Optional) The following table describes the parameters that must be set in SpidCfg MOs to configure SPIDs.
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Parameter Name
Parameter ID
Data Source
Setting Notes
Spid
SpidCfg.Spid
Network plan (negotiation not required)
This parameter specifies an SPID.
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The actual value range is 1 to 256.
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Parameter Name
Parameter ID
Data Source
Setting Notes
RAT frequency priority indication
SpidCfg. RatFreqPriorityInd
Network plan (negotiation not required)
This parameter specifies whether to configure a frequency priority group.
RAT frequency priority group ID
SpidCfg. RatFreqPriorityGroupId
Network plan (negotiation not required)
This parameter uniquely identifies a frequency priority group. The actual value range is 0 to 255.
InterFreq Mlb Switch
SpidCfg. InterFreqMlbSwitch
Network plan (negotiation not required)
This parameter specifies whether to allow interfrequency load balancing for UEs with the SPID. l If the parameter is set to TRUE (TRUE), interfrequency load balancing is allowed for UEs with the SPID. l If the parameter is set to FALSE (FALSE), interfrequency load balancing is not allowed for UEs with the SPID. This parameter takes effect only for UEs that newly access the network.
Scenario 2: Inter-RAT Load Sharing The following table describes the parameters that must be set in the CellAlgoSwitch MO to enable the inter-RAT load sharing algorithm.
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Parameter Name
Paramete r ID
Data Source
Setting Notes
Local cell ID
CellAlgoS witch. LocalCellI d
Network plan (negotiati on not required)
This parameter specifies the local ID of a cell. It uniquely identifies the cell within an eNodeB.
CellAlgoS witch. MlbAlgoS witch
Network plan (negotiati on not required)
The UtranMlbSwitch(UtranMlbSwitch) check box under this parameter specifies whether to enable load sharing with UTRAN for UEs in connected mode.
Load balancing algorithm switch
The actual value range is 0 to 17.
l If UtranMlbSwitch (UtranMlbSwitch) is selected, the algorithm is enabled. l If UtranMlbSwitch (UtranMlbSwitch) is not selected, the algorithm is disabled. The UtranIdleMlbSwitch (UtranIdleMLBSwitch) check box under this parameter specifies whether to enable load sharing with UTRAN for UEs in idle mode. l If UtranIdleMlbSwitch (UtranIdleMLBSwitch) is selected, the algorithm is enabled. l If UtranIdleMlbSwitch (UtranIdleMLBSwitch) is not selected, the algorithm is disabled. The GeranMlbSwitch (GeranMlbSwitch) check box under this parameter specifies whether to enable load sharing with GERAN. l If GeranMlbSwitch (GeranMlbSwitch) is selected, the algorithm is enabled. l If GeranMlbSwitch (GeranMlbSwitch) is not selected, the algorithm is disabled.
The following table describes the parameters that must be set in the ENodeBAlgoSwitch MO to configure the inter-RAT load sharing policy.
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Parame ter Name
Parameter ID
Data Source
Setting Notes
Handov er Mode switch
ENodeBAlgoSwi tch. HoModeSwitch
Network plan (negotiation not required)
If the UtranPsHoSwitch (UtranPsHoSwitch) or GeranPsHoSwitch (GeranPsHoSwitch) check box is selected, the eNodeB performs inter-RAT load sharing using handovers. If neither of them is not selected, the eNodeB cannot perform interRAT load sharing using handovers and MLB is not allowed.
The following table describes the parameters that must be set in the CellMLB MO to configure the inter-RAT load sharing algorithm. Param eter Name
Parameter ID
Data Source
Setting Notes
Local cell ID
CellMLB.LocalCellId
Network plan (negotiat ion not required )
This parameter specifies the local ID of a cell. It uniquely identifies the cell within an eNodeB.
Network plan (negotiat ion not required )
This parameter specifies the threshold for inter-RAT load sharing. Inter-RAT load sharing is triggered if the cell load is consistently greater than or equal to the sum of CellMLB.InterRatMlbThd and CellMLB.LoadOffset and if the number of uplink synchronized UEs in the cell is greater than or equal to CellMLB.InterRatMlbUeNumThd. InterRAT load sharing is stopped if the cell load is consistently less than CellMLB.InterRatMlbThd or the number of uplink synchronized UEs in the cell falls below CellMLB.InterRatMlbUeNumThd.
InterRAT Mobilit y Load Balanci ng Thresh old
CellMLB. InterRatMlbThd
The actual value range is 0 to 17.
The default value is 75.
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Param eter Name
Parameter ID
Data Source
Setting Notes
UTRA N Idle Mode Mobilit y Load Balanci ng Initial Valid Period
CellMLB. InitValidPeriod
Network plan (negotiat ion not required )
This parameter specifies the initial duration for load sharing with UTRAN for UEs in idle mode.
InterRAT Mobilit y Load Balanci ng Thresh old of UE number
CellMLB. InterRatMlbUeNumThd
Network plan (negotiat ion not required )
This parameter specifies the threshold for the number of uplink synchronized UEs used to trigger or stop inter-RAT load sharing.
A larger value of this parameter leads to the situation where more UEs in idle mode are transferred to UTRAN after the E-UTRAN cell is over loaded. The recommended value is 10.
The actual number of uplink synchronized UEs is equal to this threshold multiplied by 1000.
The following table describes the parameters that must be set in SpidCfg MOs to configure SPIDs. Parameter Name
Parameter ID
Data Source
Setting Notes
Spid
SpidCfg.Spid
Network plan (negotiation not required)
This parameter specifies an SPID. The actual value range is 1 to 256.
RAT frequency priority indication
SpidCfg. RatFreqPriorityInd
Network plan (negotiation not required)
This parameter specifies whether to configure a frequency priority group.
RAT frequency priority group ID
SpidCfg. RatFreqPriorityGroupId
Network plan (negotiation not required)
This parameter uniquely identifies a frequency priority group. The actual value range is 0 to 255.
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Parameter Name
Parameter ID
Data Source
Setting Notes
InterRat Mlb Switch
SpidCfg. InterRatMlbSwitch
Network plan (negotiation not required)
This parameter specifies whether to allow inter-RAT load sharing for UEs with the SPID. l If the parameter is set to TRUE (TRUE), interRAT load sharing is allowed for UEs with the SPID. l If the parameter is set to FALSE (FALSE), interRAT load sharing is not allowed for UEs with the SPID. This parameter takes effect only for UEs that newly access the network.
7.4.3 Precautions Pay attention to the following when deploying MLB in a live network: l
If the switches for inter-frequency load balancing and inter-RAT load sharing are turned on for a cell and the cell load meets the conditions for starting both types of MLB, the probabilities of both types are the same because no priorities have been specified for the different types of MLB.
l
Inter-frequency load balancing is recommended in live networks.
7.4.4 Activation Using the CME to Perform Batch Configuration for Newly Deployed eNodeBs Enter the values of the parameters listed in Table 7-2 in a summary data file, which also contains other data for the new eNodeBs to be deployed. Then, import the summary data file into the Configuration Management Express (CME) for batch configuration. For detailed instructions, see section "Creating eNodeBs in Batches" in the initial configuration guide for the eNodeB. The summary data file may be a scenario-specific file provided by the CME or a customized file, depending on the following conditions: Issue 04 (2013-10-30)
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l
The MOs in Table 7-2 are contained in a scenario-specific summary data file. In this situation, set the parameters in the MOs, and then verify and save the file.
l
Some MOs in Table 7-2 are not contained in a scenario-specific summary data file. In this situation, customize a summary data file to include the MOs before you can set the parameters. Table 7-2 Parameters for MLB MO
Sheet in the Summary Data File
Parameter Group
Remarks
CellAlgoSw itch
CELLALGOSWIT CH
MlbAlgoSwitch
This MO must be customized in a list-type sheet of the template.
CellMLB
CELLMLB
LocalCellId, InterFreqMlbThd, InterRatMlbThd, LoadExchangePeriod, LoadOffset, LoadDiffThd, InterRatMlbUeNumThd, InitValidPeriod, LoadTransferFactor
This MO must be customized in a list-type sheet of the template.
ENodeBAlg oSwitch
ENODEBALGOS WITCH
HoModeSwitch
This MO must be customized in a list-type sheet of the template.
SpidCfg (Optional)
SPIDCFG
Spid, InterFreqMlbSwitch, InterRatMlbSwitch
This MO must be customized in a list-type sheet of the template.
CellShutDo wn (Optional)
CELLSHUTDOW N
LocalCellId, CellShutdownSwitch, StartTime, StopTime, DlPrbThd, DlPrbOffset, UlPrbThd, UlPrbOffset
This MO must be customized in a list-type sheet of the template.
Using the CME to Perform Batch Configuration for Existing eNodeBs Batch reconfiguration using the CME is the recommended method to activate a feature on existing eNodeBs. This method reconfigures all data, except neighbor relationships, for multiple eNodeBs in a single procedure. The procedure is as follows: Step 1 Choose CME > Advanced > Customize Summary Data File (M2000 client mode), or choose Advanced > Customize Summary Data File (M2000 client mode), to customize a summary data file for batch reconfiguration. Issue 04 (2013-10-30)
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NOTE
For context-sensitive help on a current task in the client, press F1.
Step 2 Choose CME > LTE Application > Export Data > Export Base Station Bulk Configuration Data (M2000 client mode), or choose LTE Application > Export Data > Export Base Station Bulk Configuration Data (CME client mode), to export the eNodeB data stored on the CME into the customized summary data file. Step 3 In the summary data file, set the parameters in the MOs listed in Table 7-2 and close the file. Step 4 Choose CME > LTE Application > Import Data > Import Base Station Bulk Configuration Data (M2000 client mode), or choose LTE Application > Import Data > Import Base Station Bulk Configuration Data (CME client mode), to import the summary data file into the CME. Step 5 Choose CME > Planned Area > Export Incremental Scripts (M2000 client mode), or choose Area Management > Planned Area > Export Incremental Scripts (CME client mode), to export and activate the incremental scripts. ----End
Using the CME to Perform Single Configuration On the CME, set the parameters listed in the "Data Preparation" section for a single eNodeB. The procedure is as follows: Step 1 In the planned data area, click Base Station in the upper left corner of the configuration window. Step 2 In area 1 shown in Figure 7-1, select the eNodeB to which the MOs belong. Figure 7-1 MO search and configuration window
Step 3 On the Search tab page in area 2, enter an MO name, for example, CELL. Issue 04 (2013-10-30)
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Step 4 In area 3, double-click the MO in the Object Name column. All parameters in this MO are displayed in area 4. Step 5 Set the parameters in area 4 or 5. Step 6 Choose CME > Planned Area > Export Incremental Scripts (M2000 client mode), or choose Area Management > Planned Area > Export Incremental Scripts (CME client mode), to export and activate the incremental scripts. ----End
Using MML Commands Scenario 1: Inter-Frequency Load Balancing Step 1 Run the MOD CELLMLB command to set the threshold for inter-frequency load balancing. Step 2 Run the MOD CELLALGOSWITCH command to enable the inter-frequency load balancing algorithm. Step 3 (Optional) Run the ADD SPIDCFG command to set an SPID and enable SPID-specific interfrequency load balancing. If the SPID already exists, run the MOD SPIDCFG command to modify the configuration as required. ----End Scenario 2: Inter-RAT Load Sharing for UEs in Connected Mode Step 1 Run the MOD ENODEBALGOSWITCH command with the UtranPsHoSwitch (UtranPsHoSwitch) or GeranPsHoSwitch(GeranPsHoSwitch) check box under the Handover Mode switch parameter selected. Step 2 Run the MOD CELLMLB command to set the threshold for inter-RAT load sharing and the threshold for the number of uplink synchronized UEs. Step 3 Run the MOD CELLALGOSWITCH command to enable inter-RAT load sharing with UTRAN for UEs in connected mode or inter-RAT load sharing with GERAN. Step 4 (Optional) Run the ADD SPIDCFG command to set an SPID and enable SPID-specific interRAT load sharing. If the SPID already exists, run the MOD SPIDCFG command to modify the configuration as required. ----End Scenario 3: Inter-RAT Load Sharing for UEs in Idle Mode Step 1 Run the MOD CELLMLB command to modify the threshold for inter-RAT load sharing, the threshold for the number of uplink synchronized UEs, and the initial duration for load sharing with UTRAN for UEs in idle mode. Step 2 Run the MOD CELLALGOSWITCH command to enable inter-RAT load sharing with UTRAN for UEs in idle mode. ----End
MML Command Examples Scenario 1: Inter-Frequency Load Balancing Issue 04 (2013-10-30)
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MOD CELLMLB: LocalCellId=0, InterFreqMlbThd=60; MOD CELLALGOSWITCH: LocalCellId=0, MlbAlgoSwitch=InterFreqMlbSwitch-1; ADD SPIDCFG: Spid=1, RatFreqPriorityInd=NOT_CFG, InterFreqMlbSwitch=TRUE;
Scenario 2: Inter-RAT Load Sharing for UEs in Connected Mode MOD MOD MOD MOD MOD ADD
ENODEBALGOSWITCH: HoModeSwitch=UtranPsHoSwitch-1; ENODEBALGOSWITCH: HoModeSwitch=GeranPsHoSwitch-1; CELLMLB: LocalCellId=0, InterRatMlbThd=70, InterRatMlbUeNumThd=15; CELLALGOSWITCH: LocalCellId=0, MlbAlgoSwitch=UtranMlbSwitch-1; CELLALGOSWITCH: LocalCellId=0, MlbAlgoSwitch=GeranMlbSwitch-1; SPIDCFG: Spid=1, RatFreqPriorityInd=NOT_CFG, InterRatMlbSwitch=TRUE;
Scenario 3: Inter-RAT Load Sharing for UEs in Idle Mode MOD CELLMLB: LocalCellId=0, InterRatMlbThd=70, InterRatMlbUeNumThd=15, InitValidPeriod=10; MOD CELLALGOSWITCH: LocalCellId=0, MlbAlgoSwitch=UtranIdleMlbSwitch-1;
7.4.5 Activation Observation Inter-Frequency Load Balancing To verify whether inter-frequency load balancing works correctly, perform the following steps: Step 1 On the M2000 client, choose Monitor > Signaling Trace > Signaling Trace Management. The Signaling Trace Management window is displayed, as shown in Figure 7-2. Figure 7-2 Signaling Trace Management window
Step 2 Start RB usage monitoring. 1.
In the navigation tree on the left of the Signaling Trace Management window, doubleclick Usage of RB Monitoring under LTE > Cell Performance Monitoring. The Usage of RB Monitoring dialog box is displayed, as shown in Figure 7-3.
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Figure 7-3 Usage of RB Monitoring dialog box
2.
Set the task name, select the eNodeB site, and click Next. The Usage of RB Monitoring dialog box as shown in Figure 7-4 is displayed. Figure 7-4 Usage of RB Monitoring dialog box
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Enter the local cell ID and then click Finish. The RB monitoring task starts for the cell, and the tracing result is displayed as shown in Figure 7-5. Figure 7-5 RB usage tracing result
Step 3 Start MLB performance monitoring. 1.
In the navigation tree on the left of the Signaling Trace Management window, doubleclick MLB Monitoring under LTE > Cell Performance Monitoring. The MLB Monitoring dialog box is displayed, as shown in Figure 7-6. Figure 7-6 MLB Monitoring dialog box
2.
Set the task name, select the eNodeB site, and click Next.
3.
Enter the information about a neighboring cell of the local cell to be traced, as shown in Figure 7-7.
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Figure 7-7 Entering information about a neighboring cell
4.
Click Finish. The MLB performance monitoring task starts for the local cell, and the monitoring result is displayed as shown in Figure 7-8. The monitoring result includes the PRB usage of the cell, the PRB usage of the neighboring cell, and the type of load that triggers MLB in the local cell. Figure 7-8 MLB performance monitoring result
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NOTE
For details about the types of load that trigger MLB, see the related performance monitoring reference.
Step 4 On the M2000 client, start Uu interface tracing. 1.
In the navigation tree on the left of the Signaling Trace Management window, doubleclick Uu Interface Trace under LTE > Application Layer. The Uu Interface Trace dialog box is displayed as shown in Figure 7-9.
2.
Set the task name, select the eNodeB site, and click Next. The Uu Interface Trace dialog box as shown in Figure 7-10 is displayed. Figure 7-9 Uu Interface Trace dialog box
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Figure 7-10 Entering information about a Uu interface tracing task
3.
Click Finish.
The Uu interface tracing task starts for the cell, and the tracing result is displayed as shown in Figure 7-11.
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Figure 7-11 Uu interface tracing result
Step 5 Start X2 interface tracing in a similar way as Step 4, and check the messages traced over the X2 interface. NOTE
Load information can be traced on the X2 interface only in inter-eNodeB inter-frequency load balancing. No load information is exchanged over the X2 interface in intra-eNodeB inter-frequency load balancing.
If the serving cell receives a RESOURCE STATUS RESPONSE message from a neighboring cell after sending a RESOURCE STATUS REQUEST message to the neighboring cell, and later periodically receives RESOURCE STATUS UPDATE messages from the neighboring cell, inter-frequency load balancing has been activated. Figure 7-12 shows an example of the RESOURCE STATUS REQUEST message. Figure 7-12 RESOURCE STATUS REQUEST message
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NOTE
The RESOURCE STATUS REQUEST message contains the IDs (eUTRANcellIdentifier IE) of the cells whose load information is requested and the interval (reportingPeriodicity IE) at which the cell load information needs to be reported.
Step 6 Use UE1 to access the local cell in the cell center, and use UE2 to access the cell at a place where UE2 can receive signals from an inter-frequency neighboring cell with RSRP greater than InterFreqHoGroup.InterFreqLoadBasedHoA4ThdRsrp. Step 7 (This step simulates downlink overload in a 10 MHz cell as an example.) Inject downlink UDP packets for UE1 until the M2000 client shows that the RB usage exceeds the sum of InterFrequency Mobility Load Balancing Threshold and Load Offset. Inject downlink UDP packets at a rate of 2 Mbit/s for at least 1 minute. Step 8 Check for an RRC_CONN_RECFG message in the Uu interface tracing result and a HANDOVER_REQUEST message in the X2 interface tracing result. If the HANDOVER_REQUEST message containing the handover cause of "reduce-load-inserving-cell" exists, inter-frequency load sharing is working correctly. For details about the signaling procedure, see the description of a successful inter-frequency handover in Mobility Management in Connected Mode Feature Parameter Description. ----End To use SON logs to verify whether MLB takes effect, perform the following steps: Step 1 On the M2000 client, choose SON > SON Log. Step 2 On the Query SON Log tab page, choose MLB Log from the Log Category drop down list in the upper left corner, and click Inter-Frequency Handover Statistics under Event Name. Then, click Query to query SON logs. From the logs, check whether the feature is working correctly. You can view only the SON logs that were generated at least one day ago. ----End
Inter-RAT Load Sharing for UEs in Connected Mode To verify whether inter-RAT load sharing for UEs in connected mode works correctly, perform the following steps: Step 1 On the M2000 client, start Uu interface tracing, S1 interface tracing, and RB usage monitoring. For details about how to start these three tasks, see Inter-Frequency Load Balancing earlier in this section. Step 2 Use UE1 to access a cell in the cell center, and use UE2 to access the cell at a place where UE2 can receive signals from an inter-RAT neighboring cell with the radio signal greater than the trigger thresholds for load- and service-based event B1. In addition, ensure that the number of uplink synchronized UEs in the cell is greater than or equal to the Inter-RAT Mobility Load Balancing UE Number Threshold value. Step 3 (This step simulates downlink overload in a 10 MHz cell as an example.) Inject downlink UDP packets for UE1 until the M2000 client shows that the RB usage exceeds the sum of Inter-RAT Issue 04 (2013-10-30)
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Mobility Load Balancing Threshold and Load Offset. Inject downlink UDP packets for UE2 at a rate of 2 Mbit/s. Step 4 Check for an S1AP_HANDOVER_REQUIRED message in the S1 interface tracing result. If the S1AP_HANDOVER_REQUIRED message containing the cause value "reduce-load-inserving-cell" exists, inter-RAT load sharing for UEs in connected mode is working correctly. ----End To use SON logs to verify whether MLB takes effect, perform the following steps: Step 1 On the M2000 client, choose SON > SON Log. Step 2 On the Query SON Log tab page, choose MLB Log from the Log Category drop down list in the upper left corner, and click Inter-RAT Handover Statistics under Event Name. Then, click Query to query SON logs. From the logs, check whether the feature is working correctly. ----End
Inter-RAT Load Sharing with UTRAN for UEs in Idle Mode To verify whether inter-RAT load sharing for UEs in idle mode works correctly, perform the following steps: Step 1 On the M2000 client, start Uu interface tracing, S1 interface tracing, and RB usage monitoring. For details about how to start these three tasks, see Inter-Frequency Load Balancing earlier in this section. Step 2 Use UE1 to access a cell in the cell center, and use UE2 to access the cell at a place where UE2 can receive signals from an inter-RAT neighboring cell with a signal level higher than the cellreselection threshold. In addition, ensure that the number of uplink synchronized UEs in the cell is greater than or equal to the Inter-RAT Mobility Load Balancing UE Number Threshold value. Step 3 (This step simulates downlink overload in a 10 MHz cell as an example.) Inject downlink UDP packets for UE2 at a rate of 2 Mbit/s. Inject downlink UDP packets for UE1 until the M2000 client shows that the RB usage exceeds the sum of Inter-RAT Mobility Load Balancing Threshold and Load Offset. Stop injecting downlink UDP packets for UE2. Wait until its inactivity timer expires, so that UE2 enters idle mode. Check whether the RB usage exceeds the sum of Inter-RAT Mobility Load Balancing Threshold and Load Offset. If UE2 enters idle mode within the configured initial duration, the reselection priority contained in the RRC_CONN_REL message in the Uu interface tracing result meets the requirements, and UE2 is successfully transferred to the UTRAN cell, inter-RAT load sharing is working correctly. For details about the reselection priority, see 4.3.2 Transferring UEs in Idle Mode. ----End
7.4.6 Deactivation Using the CME to Perform Batch Configuration Batch reconfiguration using the CME is the recommended method to deactivate a feature on eNodeBs. This method reconfigures all data, except neighbor relationships, for multiple Issue 04 (2013-10-30)
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eNodeBs in a single procedure. The procedure for feature deactivation is similar to that for feature activation described in Using the CME to Perform Batch Configuration for Existing eNodeBs. In the procedure, modify parameters according to Table 7-3. Table 7-3 Parameters for MLB MO
Sheet in the Summary Data File
Parameter Group
Setting Notes
CELLALG OSWITCH
CELLALGOSWI TCH
MlbAlgoSwitc h
Turn off the related load balancing switch.
Using the CME to Perform Single Configuration On the CME, set parameters according to Table 7-3. For detailed instructions, see Using the CME to Perform Single Configuration described for feature activation.
Using MML Commands Scenario 1: Inter-Frequency Load Balancing Run the MOD CELLALGOSWITCH command to disable the inter-frequency load balancing algorithm. Scenario 2: Inter-RAT Load Sharing Run the MOD CELLALGOSWITCH command to disable inter-RAT load sharing with UTRAN for UEs in connected or idle mode or inter-RAT load sharing with GERAN.
MML Command Examples Scenario 1: Inter-Frequency Load Balancing MOD CELLALGOSWITCH: LocalCellId=0, MlbAlgoSwitch=InterFreqMlbSwitch-0;
Scenario 2: Inter-RAT Load Sharing MOD CELLALGOSWITCH: LocalCellId=0, MlbAlgoSwitch=UtranMlbSwitch-0; MOD CELLALGOSWITCH: LocalCellId=0, MlbAlgoSwitch=UtranIdleMlbSwitch-0; MOD CELLALGOSWITCH: LocalCellId=0, MlbAlgoSwitch=GeranMlbSwitch-0;
7.5 Performance Monitoring Table 7-4 lists the counters used to monitor inter-frequency MLB performance. They can be used to calculate the proportion of load-based inter-frequency handovers to total inter-frequency handovers in a cell.
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Table 7-4 Performance counters related to inter-frequency MLB Counter Name
Description
L.HHO.InterFreq.Load.PrepAttOut
Number of inter-frequency handover preparation attempts triggered because of high load
L.HHO.InterFreq.Load.ExecAttOut
Number of inter-frequency handover execution attempts triggered because of high load
L.HHO.InterFreq.Load.ExecSuccOut
Number of successful inter-frequency handovers triggered because of high load
Table 7-5 lists the counters used to monitor inter-RAT load sharing performance. Table 7-5 Performance counters related to inter-RAT MLB Description
Counter Name
L.IRATHO.E2W.Load.PrepAttOut
Number of EUTRAN-to-WCDMA handover preparation attempts triggered because of high load
L.IRATHO.E2W.Load.ExecAttOut
Number of EUTRAN-to-WCDMA handover execution attempts triggered because of high load
L.IRATHO.E2W.Load.ExecSuccOut
Number of successful EUTRAN-to-WCDMA handover executions triggered because of high load
L.IRATHO.E2G.Load.PrepAttOut
Number of EUTRAN-to-GERAN handover preparation attempts triggered because of high load
L.IRATHO.E2G.Load.ExecAttOut
Number of EUTRAN-to-GERAN handover execution attempts triggered because of high load
L.IRATHO.E2G.Load.ExecSuccOut
Number of successful EUTRAN-to-GERAN handover executions triggered because of high load
L.RRCRedirection.E2W.Load
Number of EUTRAN-to-WCDMA RRC redirections triggered because of high load
L.RRCRedirection.E2G.Load
Number of EUTRAN-to-GERAN RRC redirections triggered because of high load
L.RRCRel.DedicatedPri.WCD MA.High
Number of times WCDMA frequencies are assigned the highest dedicated cell-reselection priority
NOTE
LOFD-00105401 Camp & Handover Based on SPID and LOFD-001112 MOCN Flexible Priority Based Camping also affect the L.RRCRel.DedicatedPri.WCDMA.High counter.
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7.6 Parameter Optimization The following parameters may need to be adjusted for better performance: l
Thresholds inter-frequency load balancing or inter-RAT load sharing The thresholds directly determine the probabilities and effectiveness of the two types of MLB.
l
Load offset (specified by the CellMLB.LoadOffset parameter) If the load offset is set to an appropriate value, the probability of ping-pong load transfer will decrease.
l
Handover-related parameters These parameters determine the handover performance for load transfer.
7.7 Troubleshooting This section provides steps to troubleshoot a possible fault that might occur after MLB is enabled.
Serving Cell Not Initiating Load Information Exchange for Inter-Frequency Load Balancing Fault Description When inter-frequency load balancing is enabled and packet injection is performed for a UE, the serving cell fails to initiate load information exchange with the neighboring E-UTRAN cells. Fault Handling Perform the following steps for troubleshooting: Step 1 On the M2000 client, start X2 interface tracing task by referring to Inter-Frequency Load Balancing in 7.4.5 Activation Observation. Step 2 Check whether the serving eNodeB has sent a RESOURCE STATUS REQUEST message, which contains information about the neighboring cells involved in load information exchange with the serving cell. If the eNodeB has not sent this message, then this fault did occur. Go to Step 3. Step 3 Run the LST EUTRANINTERFREQNCELL command to check the inter-frequency neighboring cells of the serving cell. 1.
If at least one neighboring cell is displayed, go to 3.2. Otherwise, configure inter-frequency neighboring cells and end the troubleshooting procedure.
2.
If all the inter-frequency neighboring cells displayed are intra-eNodeB neighboring cells, this is a normal condition and no fault handling is required. If all the inter-frequency neighboring cells displayed are inter-eNodeB neighboring cells, run the DSP X2INTERFACE command to check the connectivity of the X2 interface. If the X2 interface is functional, go to 3.3. Otherwise, handle the ALM-29204 X2 Interface Fault by following handling suggestions in the alarm reference.
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If No handover indicator for the neighboring cell is Permit Ho, go to Step 4. Otherwise, run the MOD EUTRANINTERFREQNCELL command to change it to Permit Ho.
Step 4 Run the LST INTERFREQBLKCELL command to check whether the displayed interfrequency neighboring cells have been blacklisted. l If all these neighboring cells are blacklisted, this fault occurred because the eNodeB does not perform MLB on blacklisted cells. No further action is required. l Otherwise, go to Step 5. Step 5 On the M2000 client, check whether ALM-29247 Cell PCI Conflict has been reported for the serving cell. l If this alarm has been reported, handle the alarm by following handling suggestions in the alarm reference. l If this alarm has not been reported, contact Huawei technical support. ----End
Failing to Initiate Inter-RAT Load Sharing with UTRAN for UEs in Connected Mode Fault Description When inter-RAT load sharing with UTRAN for UEs in connected mode is enabled, the UtranPsHoSwitch(UtranPsHoSwitch) check box under the Handover Mode switch parameter is selected, and packet injection is performed for UEs, the servicing cell cannot initiate inter-RAT load sharing to a UTRAN cell for any UE. Fault Handling Perform the following steps for troubleshooting: Step 1 On the M2000 client, start RB usage monitoring by referring to Inter-Frequency Load Balancing in 7.4.5 Activation Observation. Step 2 Check whether the RB usage of the serving cell exceeds the sum of Inter-RAT Mobility Load Balancing Threshold and Load Offset. l If so, go to Step 3. l If not, increase the traffic volume of UEs. Step 3 Check whether the number of uplink synchronized UEs exceeds Inter-RAT Mobility Load Balancing UE Number Threshold. l If so, go to Step 4. l If not, this is not a problem. No further action is required. Step 4 Run the LST UTRANNCELL command to check whether the inter-RAT neighbor relationship has been configured on the serving cell. l If so, contact Huawei technical support. l If not, configure the inter-RAT neighbor relationship on the serving cell. ----End Issue 04 (2013-10-30)
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Failing to Initiate Inter-RAT Load Sharing with UTRAN for UEs in Idle Mode Fault Description When inter-RAT load sharing with UTRAN for UEs in idle mode is enabled, no UE in the serving cell can be transferred to a UTRAN cell by cell reselection. Fault Handling Perform the following steps for troubleshooting: Step 1 On the M2000 client, start RB usage monitoring by referring to Inter-Frequency Load Balancing in 7.4.5 Activation Observation. Step 2 Check whether the RB usage of the serving cell exceeds the sum of Inter-RAT Mobility Load Balancing Threshold and Load Offset. l If so, go to Step 3. l If not, increase the traffic volume of UEs. Step 3 Check whether the number of uplink synchronized UEs exceeds Inter-RAT Mobility Load Balancing UE Number Threshold. l If so, go to Step 4. l If not, this is not a problem. No further action is required. Step 4 Check whether the priorities of E-UTRAN frequencies and those of neighboring UTRAN frequencies belong to non-overlapping ranges. l If so, go to Step 5. l If not, modify the frequency priority configurations. Step 5 Run the LST UTRANNCELL command to check whether the inter-RAT neighbor relationship has been configured on the serving cell. l If so, contact Huawei technical support. l If not, configure the inter-RAT neighbor relationship on the serving cell. ----End
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8
Parameters
Table 8-1 Parameter description MO
Parameter ID
MML Command
Feature ID
Feature Name
Description
CellAlgoSwitch
MlbAlgoSwitch
MOD CELLALGOS WITCH
LOFD-001032 / TDLOFD-0010 32
Intra-LTE Load Balancing
LST CELLALGOS WITCH
LOFD-001044 / TDLOFD-0010 44
Meaning:Indicates the switches used to enable or disable load balancing algorithms, including the switches which are used to control the intrafrequency, intrafrequency idle, and interfrequency load balancing algorithms, blind interfrequency load balancing algorithms, and UTRAN, UTRAN idle, GERAN, CDMA2000 and LoadInfo load sharing algorithms. If one switch is turned on, the corresponding algorithm is
LOFD-001045 / TDLOFD-0010 45 LOFD-001057
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MO
Parameter ID
8 Parameters
MML Command
Feature ID
Feature Name
Description enabled to balance or share the loads between neighboring cells of the specified category. If IntraFreqMlbSwitch is set to On, intrafrequency load balancing is enabled and therefore IntraFreqIdleMlbSwitch becomes valid. If IntraFreqMlbSwitch is set to Off, intrafrequency load balancing is disabled and therefore IntraFreqIdleMlbSwitch does not take effect. This parameter will be removed in later versions. In this version, the setting of this parameter is still synchronized between the M2000 and the eNodeB, but it is no longer used internally. Therefore, avoid using this parameter. If InterFreqMlbSwitch is set to On, inter-
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MO
Parameter ID
8 Parameters
MML Command
Feature ID
Feature Name
Description frequency load balancing is enabled. If InterFreqMlbSwitch is set to Off, interfrequency load balancing is disabled. If UtranMlbSwitc h is set to On, load sharing with UTRAN is enabled. If UtranMlbSwitc h is set to Off, load sharing with UTRAN is disabled. If GeranMlbSwitc h is set to On, load sharing with GERAN is enabled. If GeranMlbSwitc h is set to Off, load sharing with GERAN is disabled. If CdmaMlbSwitc h is set to On, load sharing with CDMA2000 is enabled. If CdmaMlbSwitc h is set to Off, load sharing with CDMA2000 is disabled. This parameter will be removed in later versions. In this version, the setting of this parameter is still synchronized
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MO
Parameter ID
8 Parameters
MML Command
Feature ID
Feature Name
Description between the M2000 and the eNodeB, but it is no longer used internally. Therefore, avoid using this parameter. If both IntraFreqIdleMlbSwitch and IntraFreqMlbSwitch are set to On, intrafrequency load balancing for UEs in idle mode is enabled. Otherwise, intra-frequency idle load balancing for UEs in idle mode is disabled. This parameter will be removed in later versions. In this version, the setting of this parameter is still synchronized between the M2000 and the eNodeB, but it is no longer used internally. Therefore, avoid using this parameter. If UtranIdleMlbSwitch is set to On, load sharing with UTRAN for UEs in idle mode is enabled. If UtranIdleMlbS-
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MO
Parameter ID
8 Parameters
MML Command
Feature ID
Feature Name
Description witch is set to Off, load sharing with UTRAN for UEs in idle mode is disabled. If MlbLoadInfoSwitch is set to On, whether the load sharing between an EUTRAN cell and an interRAT cell is performed based on load of the inter-RAT cell. If MlbLoadInfoSwitch is set to Off, load of an inter-RAT cell is not considered when the load sharing between an E-UTRAN cell and the inter-RAT cell is performed. In load sharing between an EUTRAN cell and an interRAT cell based on load of the inter-RAT cell, the inter-RAT cell must be a UTRAN cell. If MlbLoadInfoSwitch and UtranMlbSwitc h are both set to On, the UTRAN cells with the UMTS cell load status parameter set to Normal
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MO
Parameter ID
8 Parameters
MML Command
Feature ID
Feature Name
Description among all the UTRAN cells whose load status is obtained are considered as target cells in load sharing between an EUTRAN cell and a UTRAN cell. When InterFreqBlindMlbSwitc h is set to On, the blind interfrequency MLB is enabled. When InterFreqBlindMlbSwitc h is set to Off, the blind interfrequency MLB is disabled.InterFreqBlindMlbSwitch and InterFreqMlbSwitch cannot be set to On simultaneously. GUI Value Range:IntraFreqMlbSwitch (IntraFreqMlbSwitch), InterFreqMlbSwitch (InterFreqMlbSwitch), UtranMlbSwitc h (UtranMlbSwitc h), GeranMlbSwitc h (GeranMlbSwit ch),
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MO
Parameter ID
8 Parameters
MML Command
Feature ID
Feature Name
Description CdmaMlbSwitc h (CdmaMlbSwit ch), IntraFreqIdleMlbSwitch (IntraFreqIdleMlbSwitch), UtranIdleMlbSwitch (UtranIdleMlbS witch), MlbLoadInfoSwitch (MlbLoadInfoSwitch), InterFreqBlindMlbSwitc h(InterFreqBlindMlbSwitc h) Unit:None Actual Value Range:IntraFreqMlbSwitch, InterFreqMlbSwitch, UtranMlbSwitc h, GeranMlbSwitc h, CdmaMlbSwitc h, IntraFreqIdleMlbSwitch, UtranIdleMlbSwitch, MlbLoadInfoSwitch, InterFreqBlindMlbSwitc h Default Value:IntraFreq MlbSwitch:Off, InterFreqMlbS witch:Off, UtranMlbSwitc h:Off,
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MO
Parameter ID
8 Parameters
MML Command
Feature ID
Feature Name
Description GeranMlbSwitc h:Off, CdmaMlbSwitc h:Off, IntraFreqIdleMl bSwitch:Off, UtranIdleMlbS witch:Off, MlbLoadInfoS witch:Off, InterFreqBlind MlbSwitch:Off
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MO
Parameter ID
MML Command
Feature ID
Feature Name
Description
CellAlgoSwitch
MlbHoMode
MOD CELLALGOS WITCH
LOFD-001032 / TDLOFD-0010 32
Intra-LTE Load Balancing
LST CELLALGOS WITCH
LOFD-001044 / TD LOFD-001044
Meaning:Indicates whether to enable or disable handovers triggered by the load balancing algorithm, based on which the eNodeB determines handover policies. When a load-based handover to an inter-frequency neighboring cell in E-UTRAN is to be performed, the interfrequency blind handover is preferentially performed if InterFreqMlbBlindHo is set to ON, and the inter-frequency blind handover is not performed if InterFreqMlbBlindHo is set to OFF. When a load-based handover from an E-UTRAN cell to a UTRAN or GERAN cell is to be performed, the inter-RAT blind handover is preferentially performed if InterRatMlbBlindHo is set to ON, and the inter-RAT blind handover is not
LOFD-001045 / TDLOFD-0010 45
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MO
Parameter ID
8 Parameters
MML Command
Feature ID
Feature Name
Description performed if InterRatMlbBlindHo is set to OFF. GUI Value Range:InterFreqMlbBlindH o(InterFreqMlbBlindHo), InterRatMlbBlindHo (InterRatMlbBlindHo) Unit:None Actual Value Range:InterFreqMlbBlindH o, InterRatMlbBlindHo Default Value:InterFreq MlbBlindHo:Of f, InterRatMlbBli ndHo:Off
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MO
Parameter ID
MML Command
Feature ID
Feature Name
Description
CellMLB
LoadTransferFa ctor
MOD CELLMLB
LOFD-001032 / TDLOFD-0010 32
Intra-LTE Load Balancing
Meaning:Indicates the control factor for the amount of a single load transfer. The value of this parameter has an impact on the efficiency of MLB algorithm and the algorithm to prevent pingpong load transfer.
LST CELLMLB
GUI Value Range:0~100 Unit:% Actual Value Range:0~100 Default Value:0
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MO
Parameter ID
MML Command
Feature ID
Feature Name
Description
CellMLB
InterRatMlbThd
MOD CELLMLB
LOFD-001044 / TDLOFD-0010 44
Inter-RAT Load Sharing to UTRAN
LOFD-001045 / TDLOFD-0010 45
Inter-RAT Load Sharing to GERAN
Meaning:Indicates the threshold for triggering interRAT load balancing. Load balancing between the cell and its interRAT neighboring cell is triggered if the cell load exceeds the sum of this threshold and the offset, and is stopped if the cell load falls below this threshold.
LST CELLMLB
GUI Value Range:1~100 Unit:% Actual Value Range:1~100 Default Value: 75
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eRAN MLB Feature Parameter Description
8 Parameters
MO
Parameter ID
MML Command
Feature ID
Feature Name
Description
CellMLB
InterRatMlbUeNumThd
MOD CELLMLB
LOFD-001044 / TDLOFD-0010 44
Inter-RAT Load Sharing to UTRAN
Meaning:Indicates the threshold of the number of uplinksynchronized UEs for triggering interRAT load sharing. Load balancing between the cell and its neighboring inter-RAT cell is triggered if the number of uplinksynchronized UEs in the cell exceeds this threshold, and is stopped if the number of uplink synchronized UEs falls below this threshold. The threshold for the number of uplinksynchronized UEs equals the GUI value multiplied by 1000 and 1%. For example, a GUI value of 1 means that the threshold for the number of uplinksynchronized UEs is 10 (that is, 1000 x 1%), a GUI value of 2 means that the threshold for the
LST CELLMLB
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eRAN MLB Feature Parameter Description
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Parameter ID
8 Parameters
MML Command
Feature ID
Feature Name
Description number of uplinksynchronized UEs is 20, and a GUI value of 10 means that the number of uplinksynchronized UEs is 100. However, if the GUI values are 100 and 99, the thresholds for the numbers of uplinksynchronized UEs are 1 and 2, respectively. GUI Value Range:1~100 Unit:% Actual Value Range:1~100 Default Value: 15
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eRAN MLB Feature Parameter Description
8 Parameters
MO
Parameter ID
MML Command
Feature ID
Feature Name
Description
CellMLB
InitValidPeriod
MOD CELLMLB
LOFD-001044 / TDLOFD-0010 44
Inter-RAT Load Sharing to UTRAN
Meaning:Indicates the standard valid duration for load sharing with universal terrestrial radio access network (UTRAN) for UEs in idle mode. The actual duration increases on the basis of a standard valid duration with the increase of the number of uplinksynchronized UEs.
LST CELLMLB
GUI Value Range:1~30 Unit:s Actual Value Range:1~30 Default Value: 10
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eRAN MLB Feature Parameter Description
8 Parameters
MO
Parameter ID
MML Command
Feature ID
Feature Name
Description
ENodeBAlgoS witch
HoModeSwitch
MOD ENODEBALG OSWITCH
LOFD-001022 / TDLOFD-0010 22
SRVCC to UTRAN
LST ENODEBALG OSWITCH
LOFD-001023 / TDLOFD-0010 23
Meaning:Indicates the switches corresponding to the inputs based on which the eNodeB determines handover policies. EutranVoipCap Switch: This switch will be removed in later versions. In this version, the setting of this switch is still synchronized between the M2000 and the eNodeB, but it is no longer used internally. Therefore, avoid using this switch. UtranVoipCapS witch: If this switch is turned on, UTRAN supports VoIP. If this switch is turned off, UTRAN does not support VoIP. GeranVoipCapS witch: If this switch is turned on, GERAN supports VoIP. If this switch is turned off, GERAN does not support VoIP. Cdma1xRttVoip
LOFD-001033 / TDLOFD-0010 33 LOFD-001034 / TDLOFD-0010 34 LOFD-001019 / TDLOFD-0010 19 LOFD-001020 / TDLOFD-0010 20 LOFD-001021 / TDLOFD-0010 21 TDLOFD-0010 52 TDLOFD-0010 88 TDLOFD-0010 43 TDLOFD-0010 72 TDLOFD-0010 46 TDLOFD-0010 73
SRVCC to GERAN CS Fallback to UTRAN CS Fallback to GERAN PS Inter-RAT Mobility between EUTRAN and UTRAN PS Inter-RAT Mobility between EUTRAN and GERAN PS Inter-RAT Mobility between EUTRAN and CDMA2000 Flash CS Fallback to UTRAN CS Fallback Steering to UTRAN Service based Inter-RAT handover to UTRAN Distance based Inter-RAT handover to UTRAN Service based Inter-RAT handover to GERAN Distance based Inter-RAT
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eRAN MLB Feature Parameter Description
MO
Parameter ID
Issue 04 (2013-10-30)
8 Parameters
MML Command
Feature ID
Feature Name
Description
handover to GERAN
CapSwitch: If this switch is turned on, CDMA2000 1xRTT supports VoIP. If this switch is turned off, CDMA2000 1xRTT does not support VoIP. UtranPsHoSwit ch: If this switch is turned on, UTRAN supports PS handovers. If this switch is turned off, UTRAN does not support PS handovers. GeranPsHoSwit ch: If this switch is turned on, GERAN supports PS handovers. If this switch is turned off, GERAN does not support PS handovers. CdmaHrpdNon OtpimisedHoSwitch: If this switch is turned on, nonoptimized handovers to CDMA2000 HRPD are enabled. If this switch is turned off, nonoptimized handovers to CDMA2000 HRPD are
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eRAN MLB Feature Parameter Description
MO
Parameter ID
8 Parameters
MML Command
Feature ID
Feature Name
Description disabled. CdmaHrpdOpti misedHoSwitch : If this switch is turned on, optimized handovers to CDMA2000 HRPD are enabled. If this switch is turned off, optimized handovers to CDMA2000 HRPD are disabled. GeranNaccSwit ch: This switch does not take effect if GeranCcoSwitc h is disabled. If this switch is turned on, GERAN supports network assisted cell change (NACC). If this switch is turned off, GERAN does not support NACC. GeranCcoSwitc h: If this switch is turned on, GERAN supports cell change order (CCO). If this switch is turned off, GERAN does not support CCO. UtranSrvccSwit ch: If this switch is turned on, UTRAN
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eRAN MLB Feature Parameter Description
MO
Parameter ID
8 Parameters
MML Command
Feature ID
Feature Name
Description supports single radio voice call continuity (SRVCC). If this switch is turned off, UTRAN does not support SRVCC. GeranSrvccSwit ch: If this switch is turned on, GERAN supports SRVCC. If this switch is turned off, GERAN does not support SRVCC. Cdma1xRttSrvc cSwitch: If this switch is turned on, CDMA2000 1xRTT supports SRVCC. If this switch is turned off, CDMA2000 1xRTT does not support SRVCC. UtranRedirectSwitch: If this switch is turned on, redirection to UTRAN is enabled. If this switch is turned off, redirection to UTRAN is disabled. GeranRedirectS witch: If this switch is turned on, redirection to GERAN is enabled. If this switch is turned off, redirection to GERAN is
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eRAN MLB Feature Parameter Description
MO
Parameter ID
8 Parameters
MML Command
Feature ID
Feature Name
Description disabled. CdmaHrpdRedi rectSwitch: If this switch is turned on, redirection to CDMA2000 HRPD is enabled. If this switch is turned off, redirection to CDMA2000 HRPD is disabled. Cdma1xRttRedi rectSwitch: If this switch is turned on, redirection to CDMA2000 1xRTT is enabled. If this switch is turned off, redirection to CDMA2000 1xRTT is disabled. BlindHoSwitch: If this switch is turned on, blind handovers for CSFB are enabled. If this switch is turned off, blind handovers for CSFB are disabled. LcsSrvccSwitch : If this switch is turned on, an SRVCC procedure is triggered when a UE receives a CSFB instruction during a VoIP
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eRAN MLB Feature Parameter Description
MO
Parameter ID
8 Parameters
MML Command
Feature ID
Feature Name
Description service. If this switch is turned off, an SRVCC procedure is not triggered when a UE receives a CSFB instruction during a VoIP service. AutoGapSwitch : If this switch is turned on and UEs support automatic measurement gap configurations on the target frequency, the eNodeB does not deliver gap configurations to UEs. If this switch is turned off, the eNodeB delivers gap configurations to UEs during all inter-frequency and inter-RAT measurements. GUI Value Range:EutranVoipCapSwitch (EutranVoipCap Switch), UtranVoipCapS witch (UtranVoipCap Switch), GeranVoipCapS witch (GeranVoipCap Switch), Cdma1xRttVoip CapSwitch
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eRAN MLB Feature Parameter Description
MO
Parameter ID
8 Parameters
MML Command
Feature ID
Feature Name
Description (Cdma1xRttVoi pCapSwitch), UtranPsHoSwit ch (UtranPsHoSwit ch), GeranPsHoSwit ch (GeranPsHoSwi tch), CdmaHrpdNon OtpimisedHoSwitch (CdmaHrpdNon OtpimisedHoSwitch), CdmaHrpdOpti misedHoSwitch (CdmaHrpdOpti misedHoSwitch ), GeranNaccSwit ch (GeranNaccSwi tch), GeranCcoSwitc h (GeranCcoSwit ch), UtranSrvccSwit ch (UtranSrvccSwitch), GeranSrvccSwit ch (GeranSrvccSwitch), Cdma1xRttSrvc cSwitch (Cdma1xRttSrv ccSwitch), UtranRedirectSwitch (UtranRedirectS witch), GeranRedirectS witch (GeranRedirect
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eRAN MLB Feature Parameter Description
MO
Parameter ID
8 Parameters
MML Command
Feature ID
Feature Name
Description Switch), CdmaHrpdRedi rectSwitch (CdmaHrpdRed irectSwitch), Cdma1xRttRedi rectSwitch (Cdma1xRttRed irectSwitch), BlindHoSwitch (BlindHoSwitch ), LcsSrvccSwitch (LcsSrvccSwitc h), AutoGapSwitch (AutoGapSwitc h) Unit:None Actual Value Range:EutranVoipCapSwitch , UtranVoipCapS witch, GeranVoipCapS witch, Cdma1xRttVoip CapSwitch, UtranPsHoSwit ch, GeranPsHoSwit ch, CdmaHrpdNon OtpimisedHoSwitch, CdmaHrpdOpti misedHoSwitch , GeranNaccSwit ch, GeranCcoSwitc h, UtranSrvccSwit ch, GeranSrvccSwit ch,
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eRAN MLB Feature Parameter Description
MO
Parameter ID
8 Parameters
MML Command
Feature ID
Feature Name
Description Cdma1xRttSrvc cSwitch, UtranRedirectSwitch, GeranRedirectS witch, CdmaHrpdRedi rectSwitch, Cdma1xRttRedi rectSwitch, BlindHoSwitch, LcsSrvccSwitch , AutoGapSwitch Default Value:EutranVo ipCapSwitch:O n, UtranVoipCapS witch:Off, GeranVoipCapS witch:Off, Cdma1xRttVoip CapSwitch:Off, UtranPsHoSwit ch:Off, GeranPsHoSwit ch:Off, CdmaHrpdNon OtpimisedHoS witch:Off, CdmaHrpdOpti misedHoSwitch :Off, GeranNaccSwit ch:Off, GeranCcoSwitc h:Off, UtranSrvccSwit ch:Off, GeranSrvccSwit ch:Off, Cdma1xRttSrvc cSwitch:Off, UtranRedirectS witch:Off, GeranRedirectS
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eRAN MLB Feature Parameter Description
MO
Parameter ID
8 Parameters
MML Command
Feature ID
Feature Name
Description witch:Off, CdmaHrpdRedi rectSwitch:Off, Cdma1xRttRedi rectSwitch:Off, BlindHoSwitch: Off, LcsSrvccSwitch :Off, AutoGapSwitch :Off
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eRAN MLB Feature Parameter Description
8 Parameters
MO
Parameter ID
MML Command
Feature ID
Feature Name
Description
CellMLB
MlbUeSelectPrbThd
MOD CELLMLB
LOFD-001032 / TDLOFD-0010 32
Intra-LTE Load Balancing
Meaning:Indicates the PRB usage threshold of a UE in the inter-frequency MLB. When the MlbTriggerMod e parameter is set to PRB_ONLY, the UE whose the PRB usage with the load balancing in downlink or uplink is larger than the MlbUeSelectPrbThd parameter value and the PRB usage with the load balancing in the reserve direction (uplink or downlink) is less than the MlbUeSelectPrbThd parameter value is selected. When the MlbTriggerMod e parameter is set to UE_NUMBER_ ONLY, the UE whose PRB usage is less than the MlbUeSelectPrbThd parameter value is selected. When MlbTriggerMod e parameter is set to PRB_OR_UE_
LST CELLMLB
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eRAN MLB Feature Parameter Description
MO
Parameter ID
8 Parameters
MML Command
Feature ID
Feature Name
Description NUMBER, a related UE is selected based on the scenario where the interfrequency MLB is triggered the number of UEs in the serving cell. The parameter only applies to blind inter-frequency MLB in this version. GUI Value Range:0~50 Unit:% Actual Value Range:0~50 Default Value:2
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eRAN MLB Feature Parameter Description
8 Parameters
MO
Parameter ID
MML Command
Feature ID
Feature Name
Description
CellMLB
MlbTriggerMod e
MOD CELLMLB
LOFD-001032 / TDLOFD-0010 32
Intra-LTE Load Balancing
Meaning:Indicates the mode to trigger MLB. PRB_ONLY: Indicates that the interfrequency MLB is triggered by PRB usage. UE_NUMBER_ ONLY: Indicates that the interfrequency MLB is triggered by the number of UEs in the serving cell. PRB_OR_UE_ NUMBER: Indicates that blind interfrequency MLB is triggered by either the PRB usage or the number of UEs in the serving cell. The MlbTriggerMod e parameter only applies to blind inter-frequency MLB in this version.
LST CELLMLB
GUI Value Range:PRB_O NLY (PrbMode), UE_NUMBER_ ONLY (UeNumMode), PRB_OR_UE_ NUMBER (PrbOrUeNum Mode) Unit:None
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eRAN MLB Feature Parameter Description
MO
Parameter ID
8 Parameters
MML Command
Feature ID
Feature Name
Description Actual Value Range:PRB_O NLY, UE_NUMBER_ ONLY, PRB_OR_UE_ NUMBER Default Value:PRB_ON LY(PrbMode)
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eRAN MLB Feature Parameter Description
8 Parameters
MO
Parameter ID
MML Command
Feature ID
Feature Name
Description
CellMLB
InterFreqMlbUe NumThd
MOD CELLMLB
LOFD-001032 / TDLOFD-0010 32
Intra-LTE Load Balancing
Meaning:Indicates the threshold of maximum number of ULsynchronized users when the MLB is triggered by the number of UEs in the serving cell. When the number of ULsynchronized users in the serving cell exceeds the sum of the InterFreqMlbUe NumThd parameter value and the MlbUeNumOffs et parameter value, interfrequency MLB is triggered.When the number of ULsynchronized users in the serving cell is less than the InterFreqMlbUe NumThd parameter value, the interfrequency MLB stops. The InterFreqMlbUe NumThd parameter only applies to blind inter-frequency MLB in this version.
LST CELLMLB
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eRAN MLB Feature Parameter Description
MO
8 Parameters
Parameter ID
MML Command
Feature ID
Feature Name
Description GUI Value Range:1~10000 Unit:None Actual Value Range:1~10000 Default Value: 100
CellMLB
MlbUeNumOffs et
MOD CELLMLB LST CELLMLB
LOFD-001032 / TDLOFD-0010 32
Intra-LTE Load Balancing
Meaning:Indicates the offset of the number of ULsynchronized users for triggering the inter-frequency MLB. The interfrequency MLB is triggered when the number of ULsynchronized users exceeds the sum of the InterFreqMlbUe NumThd parameter value and the MlbUeNumOffs et parameter value. The MlbUeNumOffs et parameter only applies to blind interfrequency MLB in this version. GUI Value Range:0~10000 Unit:None Actual Value Range:0~10000 Default Value: 20
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eRAN MLB Feature Parameter Description
8 Parameters
MO
Parameter ID
MML Command
Feature ID
Feature Name
Description
CellMLB
MlbMaxUeNu m
MOD CELLMLB
LOFD-001032 / TDLOFD-0010 32
Intra-LTE Load Balancing
Meaning:Indicates the maximum number of UEs that can be handed over to the interfrequency cell in the interfrequency MLB. This parameter aims to avoid too many UEs being handed over to the interfrequency cell at a time, and therefore the impact on the inter-frequency cell is reduced. The MlbMaxUeNu m parameter only applies to blind interfrequency MLB in this version.
LST CELLMLB
GUI Value Range:1~20 Unit:None Actual Value Range:1~20 Default Value:5
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eRAN MLB Feature Parameter Description
8 Parameters
MO
Parameter ID
MML Command
Feature ID
Feature Name
Description
EutranInterNFre q
MlbTargetInd
ADD EUTRANINTE RNFREQ
LBFD-0020180 2/ TDLBFD-0020 1802
Coverage Based Inter-frequency Handover
Meaning:Indicates whether an inter-frequency is allowed to function as the target frequency in the interfrequency MLB. When this parameter is set to ALLOWED, an interfrequency can function as the target frequency in the interfrequency MLB. When this parameter is set to NOT_ALLOW ED, an interfrequency cannot function as the target frequency in the inter-frequency MLB. This parameter applies only to inter-frequency blind MLB in the current version.
MOD EUTRANINTE RNFREQ LST EUTRANINTE RNFREQ
GUI Value Range:NOT_A LLOWED (NOT_ALLOW ED), ALLOWED (ALLOWED) Unit:None Actual Value Range:NOT_A LLOWED, ALLOWED
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eRAN MLB Feature Parameter Description
MO
8 Parameters
Parameter ID
MML Command
Feature ID
Feature Name
Description Default Value:ALLOW ED (ALLOWED)
CellMLB
InterFreqMlbTh d
MOD CELLMLB LST CELLMLB
LOFD-001032 / TDLOFD-0010 32
Intra-LTE Load Balancing
Meaning:Indicates the threshold for triggering interfrequency load balancing. Load balancing between the cell and its interfrequency neighboring cell is triggered if the cell load exceeds the sum of this threshold and the offset, and is stopped if the cell load falls below this threshold. GUI Value Range:1~100 Unit:% Actual Value Range:1~100 Default Value: 60
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eRAN MLB Feature Parameter Description
8 Parameters
MO
Parameter ID
MML Command
Feature ID
Feature Name
Description
CellMLB
LoadOffset
MOD CELLMLB
LOFD-001032 / TDLOFD-0010 32
Intra-LTE Load Balancing
Meaning:Indicates the offset used in the evaluation of whether to trigger load balancing. To prevent load fluctuations from frequently triggering or stopping load balancing, an offset needs to be set. That is, a specific load balancing action is taken only if the cell load exceeds the sum of the corresponding load balancing threshold and this offset.
LST CELLMLB
LOFD-001044 / TDLOFD-0010 44 LOFD-001045 / TDLOFD-0010 45
Inter-RAT Load Sharing to UTRAN Inter-RAT Load Sharing to GERAN
GUI Value Range:0~50 Unit:% Actual Value Range:0~50 Default Value:8
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eRAN MLB Feature Parameter Description
8 Parameters
MO
Parameter ID
MML Command
Feature ID
Feature Name
Description
EutranInterFreqNCell
NoHoFlag
ADD EUTRANINTE RFREQNCELL
LBFD-0020180 2/ TDLBFD-0020 1802
Coverage Based Inter-frequency Handover
Meaning:Indicates whether handovers of UEs to the neighboring cell are prohibited.
MOD EUTRANINTE RFREQNCELL LST EUTRANINTE RFREQNCELL
LBFD-0020180 4/ TDLBFD-0020 1804 LBFD-0020180 5/ TDLBFD-0020 1805
Distance Based Inter-frequency Handover Service Based Inter-frequency Handover Cell Outage Detection and Compensation
LOFD-002012 / TDLOFD-0020 12
GUI Value Range:PERMIT _HO_ENUM (Permit Ho), FORBID_HO_ ENUM(Forbid Ho) Unit:None Actual Value Range:PERMIT _HO_ENUM, FORBID_HO_ ENUM Default Value:PERMIT _HO_ENUM (Permit Ho)
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eRAN MLB Feature Parameter Description
8 Parameters
MO
Parameter ID
MML Command
Feature ID
Feature Name
Description
CellMLB
LoadDiffThd
MOD CELLMLB
LOFD-001032 / TDLOFD-0010 32
Intra-LTE Load Balancing
Meaning:Indicates the threshold of load difference between two cells for load balancing. If the load difference between two cells exceeds this threshold, the eNodeB determines that load imbalance occurs and therefore initiates load balancing between the cells. If the load difference between cells falls below this threshold, the eNodeB determines that load imbalance is resolved and therefore stops load balancing between the cells.
LST CELLMLB
LOFD-001044 / TDLOFD-0010 44 LOFD-001045 / TDLOFD-0010 45
Inter-RAT Load Sharing to UTRAN Inter-RAT Load Sharing to GERAN
GUI Value Range:1~50 Unit:% Actual Value Range:1~50 Default Value: 15
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eRAN MLB Feature Parameter Description
8 Parameters
MO
Parameter ID
MML Command
Feature ID
Feature Name
Description
InterFreqHoGro up
InterFreqLoadB asedHoA4ThdR srp
ADD INTERFREQH OGROUP
LBFD-0020180 5/ TDLBFD-0020 1805
Service Based Inter-frequency Handover
Meaning:Indicates the RSRP threshold for event A4 related to load-based inter-frequency handover. When the measured RSRP value exceeds this threshold, an inter-frequency measurement report will be sent. The value -141 does not take effect and is reserved for forward compatibility. If this parameter is set to -141, the value -140 is used as the threshold in implementation. The value of this parameter is also used as the RSRP threshold for event A4 related to frequencypriority-based or service-based inter-frequency handover.
MOD INTERFREQH OGROUP LST INTERFREQH OGROUP
GUI Value Range:-141~-43 Unit:dBm Actual Value Range:-141~-43 Default Value:-103
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eRAN MLB Feature Parameter Description
8 Parameters
MO
Parameter ID
MML Command
Feature ID
Feature Name
Description
SpidCfg
InterFreqMlbSwitch
ADD SPIDCFG
LOFD-0010540 1/ TDLOFD-0010 5401
Camp & Handover Based on SPID
Meaning:Indicates whether to enable or disable inter-frequency load balancing for the SPID. The values TRUE or FALSE indicate that interfrequency load balancing is allowed or prohibited for UEs with the SPID, respectively.
MOD SPIDCFG LST SPIDCFG
LOFD-001032 / TDLOFD-0010 32
Intra-LTE Load Balancing
GUI Value Range:FALSE (FALSE), TRUE(TRUE) Unit:None Actual Value Range:FALSE, TRUE Default Value:TRUE (TRUE)
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eRAN MLB Feature Parameter Description
8 Parameters
MO
Parameter ID
MML Command
Feature ID
Feature Name
Description
InterRatHoUtranGroup
LdSvBasedHoU tranB1ThdEcn0
ADD INTERRATHO UTRANGROU P
LOFD-001043
Service based inter-RAT handover to UTRAN
Meaning:Indicates the Ec/N0 threshold for event B1 related to load- or service-based inter-RAT handover to UTRAN. This parameter specifies the requirement for Ec/N0 of the target UTRAN cell. When the measurement value exceeds this threshold, a measurement report may be sent. For a cell with large signal fading variance, set this parameter to a large value to prevent unnecessary handovers. For a cell with small signal fading variance, set this parameter to a small value to ensure timely handovers.
MOD INTERRATHO UTRANGROU P
TDLOFD-0010 22
SRVCC to UTRAN
LST INTERRATHO UTRANGROU P
GUI Value Range:-48~0 Unit:0.5dB Actual Value Range:-24~0, step:0.5 Default Value:-18
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eRAN MLB Feature Parameter Description
8 Parameters
MO
Parameter ID
MML Command
Feature ID
Feature Name
Description
InterRatHoGeranGroup
LdSvBasedHoG eranB1Thd
ADD INTERRATHO GERANGROU P
LOFD-001046 / TDLOFD-0010 46
Service based inter-RAT handover to GERAN
Meaning:Indicates the RSSI threshold for event B1 related to load- or service-based inter-RAT handover to GERAN. When the measured RSSI value exceeds this threshold, a measurement report will be sent.
MOD INTERRATHO GERANGROU P LST INTERRATHO GERANGROU P
GUI Value Range:-110~-48 Unit:dBm Actual Value Range:-110~-48 Default Value:-98
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eRAN MLB Feature Parameter Description
8 Parameters
MO
Parameter ID
MML Command
Feature ID
Feature Name
Description
SpidCfg
InterRatMlbSwitch
ADD SPIDCFG
LOFD-0010540 1/ TDLOFD-0010 5401
Camp & Handover Based on SPID
Meaning:Indicates whether to enable or disable inter-RAT load sharing for the SPID. The values TRUE or FALSE indicate that inter-RAT load sharing is allowed or prohibited for UEs with the SPID, respectively.
MOD SPIDCFG LST SPIDCFG
LOFD-001044 / TDLOFD-0010 44 LOFD-001045 / TDLOFD-0010 45
Inter-RAT Load Sharing to UTRAN Inter-RAT Load Sharing to GERAN
GUI Value Range:FALSE (FALSE), TRUE(TRUE) Unit:None Actual Value Range:FALSE, TRUE Default Value:TRUE (TRUE)
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eRAN MLB Feature Parameter Description
8 Parameters
MO
Parameter ID
MML Command
Feature ID
Feature Name
Description
RrcConnStateTi mer
T320ForLoadB alance
MOD RRCCONNST ATETIMER
None
None
Meaning:Indicates the length of timer T320 for load balancing. T320 specifies the time period during which the dedicated priorities (used for cell reselection) retain valid. The time period is contained in the RRCConnection Release message that is received by the UE. After T320 expires, the dedicated priorities become invalid. This timer is started when the UE receives an RRCConnection Release message containing the t320 IE. This timer is stopped when the UE enters the RRC_CONNEC TED mode.
LST RRCCONNST ATETIMER
GUI Value Range:min5(5), min10(10), min20(20), min30(30), min60(60), min120(120), min180(180) Unit:min
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eRAN MLB Feature Parameter Description
MO
8 Parameters
Parameter ID
MML Command
Feature ID
Feature Name
Description Actual Value Range:min5, min10, min20, min30, min60, min120, min180 Default Value:min10 (10)
InterRatHoUtranGroup
LdSvBasedHoU tranB1ThdRscp
ADD INTERRATHO UTRANGROU P MOD INTERRATHO UTRANGROU P
LOFD-001043 TDLOFD-0010 22
Service based inter-RAT handover to UTRAN SRVCC to UTRAN
LST INTERRATHO UTRANGROU P
Meaning:Indicates the RSCP threshold for event B1 related to load- or service-based inter-RAT handover to UTRAN. This parameter specifies the requirement for RSCP of the target UTRAN cell. When the measurement value exceeds this threshold, a measurement report will be sent. GUI Value Range:-120~-25 Unit:dBm Actual Value Range:-120~-25 Default Value:-101
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eRAN MLB Feature Parameter Description
8 Parameters
MO
Parameter ID
MML Command
Feature ID
Feature Name
Description
CellAlgoSwitch
LocalCellId
LST CELLALGOS WITCH
None
None
Meaning:Indicates the local ID of the cell. It uniquely identifies a cell within a BS.
MOD CELLALGOS WITCH
GUI Value Range:0~17 Unit:None Actual Value Range:0~17 Default Value:None CellMLB
LocalCellId
LST CELLMLB
None
None
MOD CELLMLB
Meaning:Indicates the local ID of the cell. It uniquely identifies a cell within a BS. GUI Value Range:0~17 Unit:None Actual Value Range:0~17 Default Value:None
SpidCfg
Spid
ADD SPIDCFG LST SPIDCFG MOD SPIDCFG RMV SPIDCFG
LOFD-0010540 1/ TDLOFD-0010 5401 LOFD-001059 / TDLOFD-0010 59
Camp & Handover Based on SPID UL Preallocation Based on SPID
Meaning:Indicates the subscriber profile ID (SPID). GUI Value Range:1~256 Unit:None Actual Value Range:1~256 Default Value:None
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eRAN MLB Feature Parameter Description
8 Parameters
MO
Parameter ID
MML Command
Feature ID
Feature Name
Description
SpidCfg
RatFreqPriorityInd
ADD SPIDCFG
LOFD-0010540 1/ TDLOFD-0010 5401
Camp & Handover Based on SPID
Meaning:Indicates whether to set the priority for the intraRAT frequency group. If this parameter is set to CFG(CFG), UEs select the target frequency based on the priority setting. If this parameter is set to NOT_CFG (NOT_CFG), UEs do not select the target frequency based on the priority setting.
MOD SPIDCFG LST SPIDCFG
GUI Value Range:NOT_CF G(NOT_CFG), CFG(CFG) Unit:None Actual Value Range:NOT_CF G, CFG Default Value:NOT_CF G(NOT_CFG) SpidCfg
RatFreqPriorityGroupId
ADD SPIDCFG MOD SPIDCFG LST SPIDCFG
LOFD-0010540 1/ TDLOFD-0010 5401
Camp & Handover Based on SPID
Meaning:Indicates the ID of the intra-RAT frequency priority group. GUI Value Range:0~255 Unit:None Actual Value Range:0~255 Default Value:0
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eRAN MLB Feature Parameter Description
8 Parameters
MO
Parameter ID
MML Command
Feature ID
Feature Name
Description
TLDRALG
TRMULLDRT RGTH
SET TLDRALG
LOFD-001032 / TDLOFD-0010 32
Intra-LTE Load Balancing
Meaning:Indicates the threshold for triggering the UL high load. If the ratio of the UL transport load to the UL transport bandwidth of the BS keeps above this threshold for a period of hysteresis, the UL transport load of the BS enters the highload state. In UL high-load state, the BS sends a UL S1 TNL Load Indicator, which is set to HighLoad, to each neighboring BS through the X2 interface.
LST TLDRALG
GUI Value Range:0~100 Unit:% Actual Value Range:0~100 Default Value: 70
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eRAN MLB Feature Parameter Description
8 Parameters
MO
Parameter ID
MML Command
Feature ID
Feature Name
Description
TLDRALG
TRMDLLDRT RGTH
SET TLDRALG
LOFD-001032 / TDLOFD-0010 32
Intra-LTE Load Balancing
Meaning:Indicates the threshold for triggering the DL high load. If the ratio of the DL transport load to the DL transport bandwidth of the BS keeps above this threshold for a period of hysteresis, the DL transport load of the BS enters the highload state. In DL high-load state, the BS sends a DL S1 TNL Load Indicator, which is set to HighLoad, to each neighboring BS through the X2 interface.
LST TLDRALG
GUI Value Range:0~100 Unit:% Actual Value Range:0~100 Default Value: 70
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eRAN MLB Feature Parameter Description
8 Parameters
MO
Parameter ID
MML Command
Feature ID
Feature Name
Description
TLDRALG
TRMULLDRC LRTH
SET TLDRALG
LOFD-001032 / TDLOFD-0010 32
Intra-LTE Load Balancing
Meaning:Indicates the threshold for clearing the UL high load. If the ratio of the UL transport load to the UL transport bandwidth of the BS keeps below this threshold for a period of hysteresis, the UL transport load of the BS enters the medium-load state. In UL medium load state, the BS sends a UL S1 TNL Load Indicator, which is set to MediumLoad, to each neighboring BS through the X2 interface.
LST TLDRALG
GUI Value Range:0~100 Unit:% Actual Value Range:0~100 Default Value: 65
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eRAN MLB Feature Parameter Description
8 Parameters
MO
Parameter ID
MML Command
Feature ID
Feature Name
Description
TLDRALG
TRMDLLDRC LRTH
SET TLDRALG
LOFD-001032 / TDLOFD-0010 32
Intra-LTE Load Balancing
Meaning:Indicates the threshold for clearing the DL high load. If the ratio of the transport load to the transmission bandwidth in DL of the BS keeps below this threshold for a period of time, the DL transport load of the BS enters the medium-load state. In DL medium-load state, the BS sends a DL S1 TNL Load Indicator, which is set to MediumLoad, to each neighboring BS through the X2 interface.
LST TLDRALG
GUI Value Range:0~100 Unit:% Actual Value Range:0~100 Default Value: 65
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eRAN MLB Feature Parameter Description
8 Parameters
MO
Parameter ID
MML Command
Feature ID
Feature Name
Description
TLDRALG
TRMULMLDT RGTH
SET TLDRALG
LOFD-001032 / TDLOFD-0010 32
Intra-LTE Load Balancing
Meaning:Indicates the threshold for triggering the UL medium load. If the ratio of the UL transport load to the UL transport bandwidth of the BS is above this threshold, the UL transport load of the BS enters the medium-load state. In UL medium-load state, the BS sends a UL S1 TNL Load Indicator, which is set to MediumLoad, to each neighboring BS through the X2 interface.
LST TLDRALG
GUI Value Range:0~100 Unit:% Actual Value Range:0~100 Default Value: 50
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eRAN MLB Feature Parameter Description
8 Parameters
MO
Parameter ID
MML Command
Feature ID
Feature Name
Description
TLDRALG
TRMDLMLDT RGTH
SET TLDRALG
LOFD-001032 / TDLOFD-0010 32
Intra-LTE Load Balancing
Meaning:Indicates the threshold for triggering the DL medium load. If the ratio of the DL transport load to the DL transport bandwidth of the BS is above this threshold, the DL transport load of the BS enters the medium-load state. In DL medium-load state, the BS sends a DL S1 TNL Load Indicator, which is set to MediumLoad, to each neighboring BS through the X2 interface.
LST TLDRALG
GUI Value Range:0~100 Unit:% Actual Value Range:0~100 Default Value: 50
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eRAN MLB Feature Parameter Description
8 Parameters
MO
Parameter ID
MML Command
Feature ID
Feature Name
Description
TLDRALG
TRMULMLDC LRTH
SET TLDRALG
LOFD-001032 / TDLOFD-0010 32
Intra-LTE Load Balancing
Meaning:Indicates the threshold for clearing the UL medium load. If the ratio of the UL transport load to the UL transport bandwidth of the BS is below this threshold, the UL transport load of the BS enters the lowload state. In UL low-load state, the BS sends a UL S1 TNL Load Indicator, which is set to LowLoad, to each neighboring BS through the X2 interface.
LST TLDRALG
GUI Value Range:0~100 Unit:% Actual Value Range:0~100 Default Value: 45
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eRAN MLB Feature Parameter Description
8 Parameters
MO
Parameter ID
MML Command
Feature ID
Feature Name
Description
TLDRALG
TRMDLMLDC LRTH
SET TLDRALG
LOFD-001032 / TDLOFD-0010 32
Intra-LTE Load Balancing
Meaning:Indicates the threshold for clearing the DL medium load. If the ratio of the DL transport load to the DL transport bandwidth of the BS is below this threshold, the DL transport load of the BS enters the lowload state. In DL low-load state, the BS sends a DL S1 TNL Load Indicator, which is set to LowLoad, to each neighboring BS through the X2 interface.
LST TLDRALG
GUI Value Range:0~100 Unit:% Actual Value Range:0~100 Default Value: 45
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eRAN MLB Feature Parameter Description
8 Parameters
MO
Parameter ID
MML Command
Feature ID
Feature Name
Description
EutranInterNFre q
LocalCellId
ADD EUTRANINTE RNFREQ
None
None
Meaning:Indicates the cell ID of the local cell. It uniquely identifies a cell within an eNodeB.
LST EUTRANINTE RNFREQ MOD EUTRANINTE RNFREQ RMV EUTRANINTE RNFREQ
GUI Value Range:0~17 Unit:None Actual Value Range:0~17 Default Value:None
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eRAN MLB Feature Parameter Description
9 Counters
9
Counters
Table 9-1 Counter description Counter ID
Counter Name
Counter Description
Feature ID
Feature Name
1526728443
L.RRCRel.Dedicate dPri.WCDMA.High
Number of times that the WCDMA network is configured as the highest frequency priority in an IMMCI IE
Multi-mode: None
Camp & Handover Based on SPID
GSM: None UMTS: None LTE: LOFD-00105401 TDLOFD-0010540 1 LOFD-001044 TDLOFD-001044 LOFD-001112
1526728526
L.HHO.InterFreq.L oad.PrepAttOut
Number of interfrequency handover preparation attempts triggered because of high load
Multi-mode: None GSM: None UMTS: None LTE: LOFD-001032
Camp & Handover Based on SPID Inter-RAT Load Sharing to UTRAN Inter-RAT Load Sharing to UTRAN MOCN Flexible Priority Based Camping Intra-LTE Load Balancing Intra-LTE Load Balancing
TDLOFD-001032 1526728527
L.HHO.InterFreq.L oad.ExecAttOut
Number of interfrequency handover execution attempts triggered because of high load
Multi-mode: None GSM: None UMTS: None LTE: LOFD-001032
Intra-LTE Load Balancing Intra-LTE Load Balancing
TDLOFD-001032
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eRAN MLB Feature Parameter Description
9 Counters
Counter ID
Counter Name
Counter Description
Feature ID
Feature Name
1526728528
L.HHO.InterFreq.L oad.ExecSuccOut
Number of successful interfrequency handover executions triggered because of high load
Multi-mode: None
Intra-LTE Load Balancing
GSM: None UMTS: None LTE: LOFD-001032
Intra-LTE Load Balancing
TDLOFD-001032 1526728529
1526728530
1526728531
1526728532
L.IRATHO.E2W.L oad.PrepAttOut
L.IRATHO.E2W.L oad.ExecAttOut
L.IRATHO.E2W.L oad.ExecSuccOut
L.IRATHO.E2G.Lo ad.PrepAttOut
Number of interRAT handover preparation attempts from E-UTRAN to WCDMA network triggered because of high load
Multi-mode: None
Number of interRAT handover execution attempts from E-UTRAN to WCDMA network triggered because of high load
Multi-mode: None
Number of successful interRAT handover executions from EUTRAN to WCDMA network triggered because of high load
Multi-mode: None
Number of interRAT handover preparation attempts from E-UTRAN to GERAN triggered because of high load
Multi-mode: None
GSM: None UMTS: None LTE: LOFD-001044
Inter-RAT Load Sharing to UTRAN Inter-RAT Load Sharing to UTRAN
TDLOFD-001044
GSM: None UMTS: None LTE: LOFD-001044
Inter-RAT Load Sharing to UTRAN Inter-RAT Load Sharing to UTRAN
TDLOFD-001044
GSM: None UMTS: None LTE: LOFD-001044
Inter-RAT Load Sharing to UTRAN Inter-RAT Load Sharing to UTRAN
TDLOFD-001044
GSM: None UMTS: None LTE: LOFD-001045
Inter-RAT Load Sharing to GERAN Inter-RAT Load Sharing to GERAN
TDLOFD-001045 1526728533
L.IRATHO.E2G.Lo ad.ExecAttOut
Number of interRAT handover execution attempts from E-UTRAN to GERAN triggered because of high load
Multi-mode: None GSM: None UMTS: None LTE: LOFD-001045
Inter-RAT Load Sharing to GERAN Inter-RAT Load Sharing to GERAN
TDLOFD-001045
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eRAN MLB Feature Parameter Description
9 Counters
Counter ID
Counter Name
Counter Description
Feature ID
Feature Name
1526728534
L.IRATHO.E2G.Lo ad.ExecSuccOut
Number of successful interRAT handover executions from EUTRAN to GERAN triggered because of high load
Multi-mode: None
Inter-RAT Load Sharing to GERAN
Number of redirections from EUTRAN to WCDMA network triggered because of high load
Multi-mode: None
1526728535
L.RRCRedirection. E2W.Load
GSM: None UMTS: None LTE: LOFD-001045
Inter-RAT Load Sharing to GERAN
TDLOFD-001045
GSM: None UMTS: None LTE: LOFD-001044
Inter-RAT Load Sharing to UTRAN Inter-RAT Load Sharing to UTRAN
TDLOFD-001044 1526728536
L.RRCRedirection. E2G.Load
Number of redirections from EUTRAN to GERAN triggered because of high load
Multi-mode: None GSM: None UMTS: None LTE: LOFD-001045
Inter-RAT Load Sharing to GERAN Inter-RAT Load Sharing to GERAN
TDLOFD-001045 1526728949
L.RIM.Load.E2W. Req
Number of load requests from eNodeB to WCDMA network
Multi-mode: None GSM: None UMTS: None LTE: LOFD-001044
Inter-RAT Load Sharing to UTRAN Inter-RAT Load Sharing to UTRAN
TDLOFD-001044 1526728950
L.RIM.Load.E2W. Resp
Number of load responses from WCDMA network to eNodeB
Multi-mode: None GSM: None UMTS: None LTE: LOFD-001044
Inter-RAT Load Sharing to UTRAN Inter-RAT Load Sharing to UTRAN
TDLOFD-001044 1526728951
L.RIM.Load.E2W. Update
Number of load updates from eNodeB to WCDMA network
Multi-mode: None GSM: None UMTS: None LTE: LOFD-001044
Inter-RAT Load Sharing to UTRAN Inter-RAT Load Sharing to UTRAN
TDLOFD-001044
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eRAN MLB Feature Parameter Description
10 Glossary
10
Glossary
For the acronyms, abbreviations, terms, and definitions, see Glossary.
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eRAN MLB Feature Parameter Description
11 Reference Documents
11
Reference Documents
1.
3GPP TS 36.300, "E-UTRAN Overall description"
2.
3GPP TS 36.331, "Radio Resource Control (RRC)"
3.
3GPP TS 36.413, "S1 Application Protocol (S1AP)"
4.
3GPP TS 36.423, "X2 application protocol (X2AP)"
5.
3GPP TS 36.902, "Self-configuring and self-optimizing network use cases and solutions"
6.
Mobility Management in Connected Mode Feature Parameter Description
7.
RAN Sharing Feature Parameter Description
8.
Transport Resource Management Feature Parameter Description
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