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Thread: DRD between different Band

  1. #1
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    Default DRD between different Band

    Dears,

    Do you have DRD working successfully between different band [850 & 1900]? *without KPI degradation

    if yes, could you kindly share your parameter setting or feature used..

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  3. #2
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    Default Re: DRD between different Band

    DRD based on UE location is working well between different bands ,
    This feature applies to a UMTS900/850+UMTS2100/1900 multiband network. This feature can be enabled during service establishment or service reconfiguration to implement service steering between the high and low frequency bands according to the UEs' path loss. Specifically, the 900 MHz or 850 MHz band is used to provide services for cell edge users
    //Activating Multiband Direct Retry Based on UE Location
    //To activate this feature for a UMTS900 cell (cell 01) and a UMTS2100 cell (cell10) under RNC 00, run the following commands:
    ADD UCELLLICENSE: CellId=10,FuncSwitch2=BASED_UE_LOC_DRD_SWITCH-1;
    ADD UCELLLICENSE: CellId=01,FuncSwitch2=BASED_UE_LOC_DRD_SWITCH-1;
    MOD UINTERFREQNCELL: RNCId=00, CellId=01, NCellRncId=00, NCellId=10, BlindHOQualityCondition=-85, BlindHoFlag=TRUE;
    MOD UINTERFREQNCELL: RNCId=00, CellId=10, NCellRncId=00, NCellId=01, BlindHOQualityCondition=-97, BlindHoFlag=TRUE;
    SET UDRD: PathlossThdForEdge=133, PathlossThdForCenter=113, BasedUELocDRDSwitch=ON, TraffTypeForBasedUELoc=RT-0&NRT-1, BasedUELocDRDRemainThd=30;
    MOD UCELLDRD: CellId=01, PathlossThdForEdge=133, PathlossThdForCenter=113, BasedUELocDRDSwitch=ON, TraffTypeForBasedUELoc=RT-0&NRT-1, BasedUELocDRDRemainThd=60;
    MOD UCELLDRD: CellId=10, PathlossThdForEdge=133, PathlossThdForCenter=113, BasedUELocDRDSwitch=ON, TraffTypeForBasedUELoc=RT-0&NRT-1, BasedUELocDRDRemainThd=30;
    //Setting DRD for a single service or combined services
    SET UCORRMALGOSWITCH: DrSwitch=DR_RAB_SING_DRD_SWITCH-1&DR_RAB_COMB_DRD_SWITCH-0;
    //Turning on the UELocBasedDRDForC2DSwitch switch
    MOD UCELLDRD: CellId=10, UELocBasedDRDForC2DSwitch=ON;
    MOD UCELLDRD: CellId=01, UELocBasedDRDForC2DSwitch=ON;
    //Turning on the RNC_P2D_DRD_SWITCH switch
    SET URRCTRLSWITCH: OptimizationSwitch=RNC_P2D_DRD_SWITCH-1;
    //Turning on the PERFENH_PSTRAFFIC_P2H_SWITCH switch
    SET UCORRMPARA: PerfEnhanceSwitch=PERFENH_PSTRAFFIC_P2H_SWITCH-1;
    //Setting the Inter-Freq Non-coverage-based Ping Pong HO Prevent Timer parameter
    SET UHOCOMM: IFAntiPingpangTimerLength=30;
    //Turning on the CMP_DL_LOAD_BALANCE_SWITCH switch
    SET UCORRMALGOSWITCH:CmpSwitch2=CMP_DL_LOAD_BALANCE_SWITCH-1;
    RNC level: BasedUELocDRDSwitch(BSC6900,BSC6910)
    Cell level: BasedUELocDRDSwitch(BSC6900,BSC6910)
    The Multiband Direct Retry Based on UE Location feature applies only to services specified by the TraffTypeForBasedUELoc(BSC6900,BSC6910) parameter
    UE accessing a low-frequency cell
    If the UE path loss is less than or equal to PathlossAdjThdForCenter, and there are high-frequency neighboring cells with the load margin being greater than or equal to BasedUELocDRDRemainThd(BSC6900,BSC6910), the candidate cells for blind handovers are ranked in descending order of priority. Priorities of high-frequency cells meeting the load margin requirement are higher than those of low-frequency cells. If multiple high-frequency cells have the highest priority, the RNC uses other DRD algorithms to rank these cells.

    UE accessing a high-frequency cell
    If the UE path loss is equal to or greater than PathlossThdForEdge(BSC6900,BSC6910), and there are low-frequency neighboring cells with the load margin being greater than or equal to BasedUELocDRDRemainThd(BSC6900,BSC6910), the candidate cells for blind handovers are ranked in descending order of priority. Priorities of low-frequency cells meeting the load margin requirement are higher than those of high-frequency cells. If multiple low-frequency cells have the highest priority, the RNC uses other DRD algorithms to rank these cells.
    To ensure a high priority for the UE location-based policy, set CMP_DL_LOAD_BALANCE_SWITCH under the CmpSwitch2(BSC6900,BSC6910) parameter to ON.
    After the DRD is complete, a timer is started to prevent ping-pong DRDs. The length of the timer is specified by the IFAntiPingpangTimerLength(BSC6900,BSC6910) parameter. Before the timer expires, only coverage-based handovers are allowed on the UE.
    When PARA_FOR_UELOC_DRD_ADJ_SWITCH under the AdapAlgoSwitch(BSC6900,BSC6910) parameter is turned on, the value of PathlossThdForCenter(BSC6900,BSC6910) is adjusted adaptively. The adjustment rules are as follows:

    When VS.UELocation.MultiBand.DRD.AttOut(BSC6900,BSC6910) is equal to or greater than ThresholdNumVaule:
    If VS.UELocation.MultiBand.DRD.SuccOut(BSC6900,BSC6910)/VS.UELocation.MultiBand.DRD.AttOut(BSC6900,BSC6910) ≥ ThresholdRatioValue1,
    then PathlossThdForCenter(BSC6900,BSC6910) = PathlossThdForCenter(BSC6900,BSC6910) + 2

    If VS.UELocation.MultiBand.DRD.SuccOut(BSC6900,BSC6910)/VS.UELocation.MultiBand.DRD.AttOut(BSC6900,BSC6910) ≤ ThresholdRatioValue2,
    then PathlossThdForCenter(BSC6900,BSC6910) = PathlossThdForCenter(BSC6900,BSC6910) – 2
    Quote Originally Posted by justdream View Post
    Dears,

    Do you have DRD working successfully between different band [850 & 1900]? *without KPI degradation

    if yes, could you kindly share your parameter setting or feature used..

  4. Thanks justdream thanked for this post
  5. #3
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    Default Re: DRD between different Band

    Friend, Please have you already tried DRD based on UE location
    and users balanced between different band without Drop & Accessibility degradation

  6. #4
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    Default Re: DRD between different Band

    yes is activated in our network and we got a good result ,is highly recommended this feature

    DCHuser
    Capture.jpg

    HS User
    hs.jpg
    Quote Originally Posted by justdream View Post
    Friend, Please have you already tried DRD based on UE location
    and users balanced between different band without Drop & Accessibility degradation

  7. Thanks justdream thanked for this post
  8. #5
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    Default Re: DRD between different Band

    Great, sorry what about PS Drop & PR RAB SR after feature activation?

  9. #6
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    Default Re: DRD between different Band

    check below KPI,
    cc.jpg


    U900 Drop is high due to Overshooting(is the Main issue)
    drop.jpg



    Quote Originally Posted by justdream View Post
    Great, sorry what about PS Drop & PR RAB SR after feature activation?

  10. Thanks justdream thanked for this post

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