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Senior Member
Reputation: 491
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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2017-11-04 05:37 PM
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VIP Member
Reputation: 1017
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; |
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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.
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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.
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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.
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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
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Originally Posted by
justdream
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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Post Thanks - 1 Thanks
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Senior Member
Reputation: 491
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
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VIP Member
Reputation: 1017
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
Originally Posted by
justdream
Friend, Please have you already tried DRD based on UE location
and users balanced between different band without Drop & Accessibility degradation
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Post Thanks - 1 Thanks
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Senior Member
Reputation: 491
Re: DRD between different Band
Great, sorry what about PS Drop & PR RAB SR after feature activation?
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VIP Member
Reputation: 1017
Re: DRD between different Band
check below KPI,
cc.jpg
U900 Drop is high due to Overshooting(is the Main issue)
drop.jpg
Originally Posted by
justdream
Great, sorry what about PS Drop & PR RAB SR after feature activation?
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Post Thanks - 1 Thanks
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