HANDOVER PROCESS切换过程.ppt

HANDOVERPROCESS切换过程,BSSPARS9,HANDOVERPROCESS切换过程Contents内容,1.Overview概述2.HandoverDecision切换判决3.TargetCellSelection目标小区选择4.Algorithms算法5.PowerBudgetHandover功率预算切换6.Level&QualityHandover电平&质量切换7.UmbrellaHandover伞切换8.TimersforHandovers切换记时器,HANDOVERPROCESS切换过程,WhatisthepurposeofHO?切换的目的是什么?Callcontinuity呼叫连续性Callquality呼叫质量Others.其它,HANDOVERPROCESS切换过程Causes原因,TimingAdvance,AdjacentCells,DownlinkQuality,UplinkQuality,AV_RXQUAL_UL_HO,AV_RXQUAL_DL_HO,DownlinkLevel,UplinkLevel,AV_RXLEV_UL_HO,AV_RXLEV_DL_HO,AV_RANGE_HO,AV_RXLEV_NCELL(n),QUALITY&INTERFERENCE,LEVEL,DISTANCE,PERIODICCHECKS,UMBRELLA,POWERBUDGET,IMPERATIVEHO,CHANNELADMINISTRATION,DIRECTEDRETRY,THRESHOLDCOMPARISON,RAPIDFIELDDROP,Others其它:IntelligentUnderlayOverlay智能层叠覆盖TrafficReason话务量原因.,MSSPEED,MSSpeed,AV_MS_SPEED,HANDOVERPROCESS切换过程HandoverDecision切换判决,Handoverprocessmaybetriggeredby切换过程可以由以下因素触发:Quality,fieldstrengthordistancevaluesfallbelow/exceedtheirthreshold质量,场强或者距离值低于/超过门限Periodicchecks周期性检查PowerbudgetHO功率预算切换UmbrellaHO伞型切换,HANDOVERPROCESS切换过程HandoverPriority切换优先级,Handoverpriority切换优先级,1.UplinkanddownlinkInterference上行和下行干扰2.Uplinkquality上行质量3.Downlinkquality下行质量4.Uplinklevel上行电平5.Downlinklevel下行电平6.Distance距离7.RapidFieldDrop快速场强衰落8.SlowmovingMS慢速移动手机9.Bettercelli.e.Periodiccheck(PowerBudgetHOorUmbrellaHO)更好小区,例如:周期性检查(功率预算切换或者伞型切换)10.PC:Lowerquality/levelthresholds(UL/DL)质量/电平下限(上行/下行)11.PC:Upperquality/levelthresholds(UL/DL)质量/电平上限(上行/下行),HANDOVERPROCESS切换过程HandoverAlgorithms切换算法,AV_RXLEV_NCELL(n)hoLevelUmbrella(n),PBGThoMarginPBGT(n)wherePBGT=(msTxPwrMax-msTxPwrMax(n)-(AV_RXLEV_DL_HO-AV_RXLEV_NCELL(n)-(btsTxPwrMax-BTS_TXPWR),AV_RXLEV_NCELL(n)rxLevMinCell(n)+Max(0,A)A=msTxPwrMax(n)-PP=dependingonMSClassmark取决于手机Classmark,PBGThoMarginLev/Qual(n)wherePBGT=(AV_RXLEV_NCELL(n)-AV_RXLEV_DL_HO)-(btsTxPwrMax-BTS_TXPWR),1.,2.,1.,InallHandovercases(inimperativeHOonlyrequirement)在所有切换中(紧急切换的话是唯一的条件),ExceptforUmbrellaHandover伞型切换例外,2.,Theadditionalcondition附加条件,HANDOVERPROCESS切换过程TargetCellSelection(1)目标小区选择,IftwoormoreAdjacentcellswithequalpriorities-Rankingbasedonradioproperties如果两个或者更多邻区具有相同优先级基于无线特性排队,LoadcheckofCandidatesbybtsLoadThreshold(0.100%)候选小区的负荷检查IfoverloadedprioritydecreasedbyhoLoadFactor(0.7)如果超负荷,则降低优先级,BestcandidatestoRRManagement无线资源管理的最佳候选小区:intraBSCHOmax16cellsunderthesameBSCasthesourcecell同BSC切换时一个BSC下最多有16个小区作为目标小区interBSCHOBSC之间切换numberOfPreferredCells,ComparisonofprioritiesofCandidates(hoLevelPriority(0.7)候选小区优先级比较,1.,2.,3.,HANDOVERPROCESS切换过程TargetCellSelection(2)目标小区选择,Allcellshaveequalpriority具有相同优先级的所有小区,cellabcRx_Level-75-80-831.Loadoverl.overl.n.overl.hoLoadFactor1112.Priority333NewPriority2233.Rx_Level-75-80=celllistc,a,b,Onecellhashigherprioritybecauseofsomereason一个小区因为某种原因而具有更高优先级,cellabcRx_Level-75-80-831.Loadn./overl.n.overl.n.overl.hoLoadFactor2112.Priority433NewPriority4/2333.Rx_Level-75-80/-80-83=celllista,b,c(ifcellaisnotoverload)=celllistb,c,a,PBGT=(msTxPwrMax-msTxPwrMax(n)-(AV_RXLEV_DL_HO-AV_RXLEV_NCELL(n)-(btsTxPwrMax-BTS_TXPWR)PBGT=(33dBm-33dBm)-(-90-80)-(42dBm-42dBm)=10dB10dB6dBOK!,AV_RXLEV_NCELL(n)rxLevMinCell(n)+Max(0,msTxPwrMax(n)-msTxPwrMax)-80dBm-99dBm+(33dBm-33dBm)=-99dBm,1.,2.,Equations1and2areused使用方程1和2,AV_RXLEV_DL_HO=-90dBmmsTxPwrMax=33dBm(=2W)btsTxPwrMax=42dBm(=16W)BTS_TX_PWR=42dBm=(16W)hoMarginPBGT(n)=6dB,ServingCell服务小区:,BestAdjacentCell最佳相邻小区:,AV_RXLEV_NCELL(n)=-80dBmrxLevMinCell(n)=-99dBmmsTxPwrMax(n)=33dBm(=2W)btsTxPwrMax=42dBm(=16W),HANDOVERPROCESS切换过程PowerBudgetHandover(1)功率预算切换,HANDOVERPROCESS切换过程PowerBudgetHandover功率预算切换(2),Trigger触发PeriodicCheck周期性检查(hoPeriodPBGT)CandidateSelection候选小区选择Equation1&2used使用方程1和2PriorityandLoadConsidered考虑优先级和负载Typicallyusedbetweencellsofthesame“Layer“用于同层的不同小区之间,hoPeriodPBGT1.63(SACCHPeriod)enablePwrBudgetHandoverY/N,ParameterValue,rxLevMinCell(n)-110-47dBmmsTxPwrMax(n)543dBmhoMarginPBGT(n)-2424dB,HANDOVERPROCESS切换过程HandoverduetoLevel(1/2)由于电平的切换,Trigger触发ThresholdComparison门限比较(hoThresholdsLevUL/DL(px-nx)CandidateSelection侯选小区选择Equation1used使用方程1Equation2usedifenableHoMarginLevQual=N使用方程2Equation2withhoMarginLevusedifenableHoMarginLevQual=YPriorityandLoadConsidered考虑优先级和负载,hoThresholdLevUL/DL-110-47px132nx132,ParameterValue,rxLevMinCell(n)-110-47dBmmsTxPwrMax(n)543dBmhoMarginLev(n)-2424dB,HANDOVERPROCESS切换过程HandoverduetoLevel(2/2),Equations1and2areusedifparameterenableHoMarginLevQualisset“Yes”如果参数enableHoMarginLevQual设为”Yes”则使用方程1和2,2dB,hoMarginLev=4dB,TriggerforHandoverduetoLevel触发由于电平的切换,A,B,=CellBisnotselectedascandidateforHOduetolevelsince2dB0dBB小区选为质量切换的潜在侯选小区,因为2dB0dB,Threshold(Lev)-95dBm,HANDOVERPROCESS切换过程HandoverduetoInterference干扰切换(1/2),Trigger触发:ThresholdComparison门限比较ThresholdComparisonforQuality质量门限切换(hoThresholdsQualUL/DL(px-nx)ThresholdComparisonforLevel电平门限切换(hoThresholdsInterferenceUL/DL(px-nx)CandidateSelection候选小区选择PriorityInterCell/IntracellselectedatBSCindependentlyUL/DLBSC上下行小区间/小区内优先级PriorityInterQualityHOifAnyTargetOtherwiseIntraCellHO,enableIntraHoInterfUL/DLY/NhoThresholdInterferenceUL/DL-110-47px132nx132,ParameterValue,hoPreferenceOrderInterfUL/DLINTER/INTRABSC,PriorityIntraIntraCellHO小区内切换,HANDOVERPROCESS切换过程HandoverduetoInterference干扰切换(2/2),Equations1and2areusedifparameterenableHandoverMarginQualisset“Yes”如果参数enableHandoverMarginQual设为”Yes”则使用方程1和2,hoThresholdQual=4hoThresholdInterferenceDL=-85dBmhoPreferenceOrderInterfDL=intra,TriggerforHandoverduetoInterference干扰切换触发,A,B,-Fieldstrengthhigherthanthreshold场强高于门限-Badquality质量差=Interference干扰=intracellhandover!小区内切换,Threshold(InterferenceLev)-85dBm,5,0,HANDOVERPROCESS,Parameters,enableBSSHandoverControlenableIntracellHandoverenablePwrBudgetHandoverenableMSDistanceHandoverenableSDCCHHandoverenableUmbrellaHandover,hoPeriodPBGT(HPP)hoPeriodUmbrella(HPU),Parameter,Value,hoThresholdsLevDL/UL(LDR/LUR)rxLevelpx(LDP,LUP)默认是1nx(LDN,LDP)默认是1,-110.-47(dBm)1.321.32,Yes/NoYes/NoYes/NoYes/NoYes/NoYes/No,0.63(SACCHperiods)0.63(SACCHperiods),HANDOVERPROCESS,Parameters,continued,Parameter,Value,hoThresholdsQualDL/ULrxQualpxnx,0.71.321.32,msDistanceHoThresholdParammsRangeMaxpxnx,0.63(TA)1.321.32,-110.-47(dBm)1.321.32,hoThresholdsInterferenceDL/ULrxLevelpxnx,HANDOVERPROCESS,Parameters,continued,Parameter,Value,minIntBetweenHoReq,0.30(s),minIntBetweenUnsucc