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Configuring Load Reshuffling

This section describes how to activate, verify, and deactivate the basic feature WRFD-020106 Load Reshuffling.

Prerequisites

Dependencies on Hardware

This feature does not depend on the hardware.

Dependencies on Other Features

This feature does not depend on other features.

License

This feature is not under license control.

Context

This feature provides multiple load reshuffling policies for a cell in the basic congestion state to decrease the cell load and increase the access success rate. The load reshufflingpolicies are inter-frequency load handover, code reshuffling, BE service rate reduction, uncontrolled real-time traffic QoS renegotiation, CS domain inter-RAT load handover, PSdomain inter-RAT load handover, downsizing the bit rate of AMR voice, and MBMS power downgrading.

Procedure

Activation Procedure

NOTE:

The following section provides the related parameters and commands. The parameter settings depend on the network plan.

1. Enable the related load reshuffling algorithms.

a. Run the BSC6900 MML command MOD UCELLALGOSWITCH. In this step, turn on the following switches of Cell LDC algorithm switch:

UL_UU_LDR: UL UU load reshuffling algorithm

DL_UU_LDR: DL UU load reshuffling algorithm

CELL_CODE_LDR: Code reshuffling algorithm

CELL_CREDIT_LDR:Credit reshuffling algorithm

b. Run the BSC6900 MML command MOD UNODEBALGOPARA. In this step, turn on the following switches of NodeB LDC algorithm switch:

IUB_LDR: NodeB Iub reshuffling algorithm

NODEB_CREDIT_LDR: NodeB-level credit reshuffling algorithm

LCG_CREDIT_LDR: cell-group-level credit reshuffling algorithm

2. Set the related thresholds.

Run the BSC6900 MML command MOD UCELLLDM to set LDR thresholds (UL/DL LDR Trigger/release threshold and DL State Trans Hysteresisthreshold).

Run the BSC6900 MML command MOD UCELLLDR to set code LDR threshold (Cell LDR SF reserved threshold) and LDR actions.

Run the BSC6900 MML command MOD UNODEBLDR to set the cell-group-level or NodeB-level LDR thresholds (Ul/DL LDR Credit SF reservedthreshold).

Run the BSC6900 MML command MOD UCELLLDR to set the cell-level credit LDR thresholds (Ul/DL LDR Credit SF reserved threshold).

3. Run the BSC6900 MML command SET ULDCPERIOD to set the LDR period (LDR period timer length).

4. Run the BSC6900 MML command SET UCORRMALGOSWITCH to enable the functions used in the LDR actions.

Inter-frequency load handover

Set HandOver Switch to HO_ALGO_LDR_ALLOW_SHO_SWITCH.

BE service rate reduction

Set Dynamic Resource Allocation Switch to DRA_DCCC_SWITCH.

Uncontrolled real-time traffic QoS renegotiation

Set Dynamic Resource Allocation Switch to DRA_IU_QOS_RENEG_SWITCH.

CS domain inter-RAT load handover

Set HandOver Switch to HO_INTER_RAT_CS_OUT_SWITCH.

PS domain inter-RAT load handover

Set HandOver Switch to HO_INTER_RAT_PS_OUT_SWITCH.

Downsizing the bit rate of AMR voice

Set CS Algorithm Switch to CS_AMRC_SWITCH.

Verification Procedure

The following section takes R99 non-real-time data services as examples to verify BE service rate reduction in the basic congestion state.

1. Enable a UE in idle mode to camp on CELL_A11.

2. On the BSC6900 LMT, open the Monitor tab page. In the Monitor Navigation Tree tab page, double-click UMTS Monitoring > Cell PerformanceMonitoring. In the displayed dialog box, create a Cell DL Throughput monitoring task.

3. Connect the UE to a laptop through the USB port and initiate a data service. Check the rb-mappinginfo information element (IE) contained in theRRC_RB_SETUP message traced over the Uu interface. The value of rrc-Stateinditator is CELL_DCH.

4. Use the UE to log in to the FTP server and then start FTP downloading. Data downloading is normal.

5. To simulate the scenario where power load reaches 75%, run the NodeB MML command STR DLSIM. The RRC_RB_RECFG message is displayed in theUu Interface Trace dialog box. In the Cell DL Throughput of the Connection Performance Monitoring dialog box, you can view the downlink RB ratedecrease configured on the RNC.

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6. To stop simulating power load, run the NodeB MML command STP DLSIM. In the Uu Interface Trace dialog box, the RRC_RB_RECFG message isdisplayed. In the Cell DL Throughput of the Connection Performance Monitoring dialog box, you can view the downlink RB rate increase configured on theRNC.

Deactivation Procedure

1. Run the BSC6900 MML command MOD UCELLALGOSWITCH. In this step, deselect the following switches from Cell LDC algorithm switch:

UL_UU_LDR: UL UU load reshuffling algorithm

DL_UU_LDR: DL UU load reshuffling algorithm

CELL_CODE_LDR: Code reshuffling algorithm

CELL_CREDIT_LDR:Credit reshuffling algorithm

2. Run the BSC6900 MML command MOD UNODEBALGOPARA. In this step, deselect the following switches from NodeB LDC algorithm switch:

IUB_LDR: NodeB Iub reshuffling algorithm

NODEB_CREDIT_LDR: NodeB-level credit reshuffling algorithm

LCG_CREDIT_LDR: cell-group-level credit reshuffling algorithm

Example

//Activating Load Reshuffling//Enabling load reshuffling algorithmsMOD UCELLALGOSWITCH: CellId=100, NBMLdcAlgoSwitch=UL_UU_LDR-1&DL_UU_LDR-1&CELL_CODE_LDR-1&CELL_CREDIT_LDR-1;MOD UNODEBALGOPARA: NodeBName="nodeb1", NodeBLdcAlgoSwitch=IUB_LDR-1&NODEB_CREDIT_LDR-1&LCG_CREDIT_LDR-1;//Setting load reshuffling thresholdsMOD UCELLLDM: CellId=100, UlLdrTrigThd=55, UlLdrRelThd=45, DlLdrTrigThd=70, DlLdrRelThd=60, UlOlcTrigThd=95, UlOlcRelThd=85, DlOlcTrigThd=95, DlOlcRelThd=85, DlLdTrnsHysTime=1000;//Setting code reshuffling thresholdsMOD UCELLLDR: CellId=100, DlLdrFirstAction=CodeAdj, DlLdrSecondAction=InterFreqLDHO, CellLdrSfResThd=SF8;//Setting NodeB-level credit reshuffling thresholdsMOD UNODEBLDR: NodeBName="nodeb1", UlLdrCreditSfResThd=SF8, DlLdrCreditSfResThd=SF8;//Setting cell-level credit reshuffling thresholdsMOD UCELLLDR: CellId=100, UlLdrCreditSfResThd=SF8, DlLdrCreditSfResThd=SF8;//Setting load reshuffling periodSET ULDCPERIOD: LDRPERIODTIMERLEN=10;//Turning on load reshuffling function switchesSET UCORRMALGOSWITCH: DraSwitch=DRA_DCCC_SWITCH-1&DRA_IU_QOS_RENEG_SWITCH-1,CsSwitch=CS_AMRC_SWITCH-1, HoSwitch=HO_ALGO_LDR_ALLOW_SHO_SWITCH-1&HO_INTER_RAT_CS_OUT_SWITCH-1&HO_INTER_RAT_PS_OUT_SWITCH-1;

//Deactivating Load ReshufflingMOD UCELLALGOSWITCH: CellId=100, NBMLdcAlgoSwitch=UL_UU_LDR-0&DL_UU_LDR-0&CELL_CODE_LDR-0&CELL_CREDIT_LDR-0;MOD UNODEBALGOPARA: NodeBName="nodeb1", NodeBLdcAlgoSwitch=IUB_LDR-0&NODEB_CREDIT_LDR-0&LCG_CREDIT_LDR-0;

Parent topic: RAN Feature Activation Guide

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