诺西2G3G互操作

Presentation/Author/5/22/2020,NSN2G-3G互操作,NSNCompetenceTeam,Presentation/Author/5/22/2020,内容,3G/2G基本原理信令流程NSN2G/3G互操作策略建议3G/2G互操作相关参数3G/2G互操作相关KPI2G/3G互操作优化,Presentation/Author/5/22/2020,GSMWCDMA互操作,GSMWCDMA互操作,空闲模式下优先附着,提供覆盖连续性,数据业务连续性,业务质量优化,负荷平衡,基于负载的切换,基于负载的呼叫控制,小区重选,分组域切换,基于业务的切换,基于覆盖的切换,空闲模式参数设置,Penaltytimers,re-selectiontimers,Presentation/Author/5/22/2020,3G/2G互操作的实现方法,IdleMode/PSconnectedMode,ConnectedModeAMRISHO,CellReselection,Inter-RATHO,S-/R-准则,压缩模式,Presentation/Author/5/22/2020,GSM系统升级,GSM为支持系统间小区选择/重选，需要GSM网络升级支持相关数据配置和系统消息。需要GSM系统增加配置WCDMA邻区以及与小区重选相关的数据,Referto3GPP04.18,Presentation/Author/5/22/2020,升级要求,Presentation/Author/5/22/2020,InIdleMode,Normallycellre-selectionisdonetocellhavingbettercoverage.Bothquality(CPICHEc/No)andrxlevel(CPICHRSCP)shouldbegoodenoughintheneighbourcellbeforecellre-selectioncanhappenSignalquality&levelrequirementsarecheckedwithS-criteriaCellRankingwithR-criteriaisdonetoselectthebestcellfromallcellsfulfillingS-criteria,Presentation/Author/5/22/2020,Cellselection:S准则,Presentation/Author/5/22/2020,Cellselection:S准则,Squal=Qqualmeas(CPICHEc/No)QqualMinSrxlev=QrxlevmeasQrxlevMin-Pcompensation,Presentation/Author/5/22/2020,Cellselection:S准则,通过S准则，找出SUITABLECELL,Presentation/Author/5/22/2020,CellRe-selection:R准则,R准则：重选出一个最好小区提供服务,Presentation/Author/5/22/2020,CellReselection3G-2GProcedure,FirstrankingofallthecellsbasedonCPICHRSCP(WCDMA)andRSSI(GSM)Rs=CPICHRSCP+Qhyst1Rn=Rxlev(n)-Qoffset1,Rn(GSM)Rs(WCDMA)AndRxlev(GSM)QrxlevMin,Yes,No,Cellre-selectiontoGSM,NeighbourWCDMAorGSMcellcalculationwithoffsetparameter,ServingWCDMAcellcalculation,withhysteresisparameter,UEstartsGSMmeasurementsifCPICHEc/NoSintrasearch)UEneednotperformintra-frequencymeasurements.2WCDMAintra-frequency(SintersearchCellre-selectionToGSM,Rs,Note:Rs=ServingWCDMACellRn=NeighbourGSMCell,Qhyst1=0,Presentation/Author/5/22/2020,IdleModeCellReselectionParameter,WCEL:Qhyst1(Qhyst2)Qhyst1isusedforTDDandGSMcells,andforFDDcellswhencellselectionandre-selectionqualitymeasureissettoCPICHRSCP(CPICHEc/No)(Qhyst1s/Qhyst2s).ThisparameterispartofSIB3.0.40dB,step2dB,default:4dB.HOPS:AdjsQoffset1(AdjsQoffset2)Thisparameterisusedinthecellre-selectionandrankingbetweenWCDMAcells.ThevalueofthisparameterissubtractedfromthemeasuredCPICHRSCP(CPICHEc/No)oftheintra-frequencyneighbourcellbeforetheUEcomparesthequalitymeasurewiththecellre-selection/rankingcriteria.-50.50dB,default:0dB.HOPS:AdjsQoffset1(AdjsQoffset2),HOPG:AdjgQoffset1,(AdjgQoffset2)WCELL:TreselectionTheUEtriggersthereselectionofanewcellifthecellreselectioncriteriaarefulfilledduringthetimeintervalTreselection.ThisparameterispartofSIB3.0.31seconds,default:0seconds.现网设为2s，重选速度变慢，但可能减少乒乓重选,Presentation/Author/5/22/2020,CrucialCell(Re-)selectionParameters,MinimumrequiredCPICHRSCP/RXLEVoftheneighbourcellforcellre-selectionGSMncellQrxlevMin(RXLEV,-110.-47dBm,step2,default-105dBm)InterFreqNcellQrxlevMin,IntraFreqNcellQrxlevMin(CPICHRSCP,-115.-25dBm,step2dBm,default-115dBm)InterFreqNcellQqualMin,IntraFreqNcellQqualMin(Ec/No,-20.0dB,step1dB,default-20dB)Offsetvalues(CPICHRSCP/RXLEV)tobesubtractedfromneighbourcellbeforequalitycomparison(re-selection&ranking)InterFreqNcellQoffset1,IntraFreqNcellQoffset1,GSMncellQoffset1InterFreqNcellQoffset2,IntraFreqNcellQoffset2Range-50.50dB,step1dB,default0dBHysteresisvaluesofservingcellusedinrankingR-criteriaQhyst1(forGSMcellsRSSI,WCDMACPICHRSCP)Qhyst2(forWCDMAcellsCPICHEc/No)Range0.40dB,step2dB,default0dB,Presentation/Author/5/22/2020,InConnectedMode,TriggersforConnectedModeISHOshallbebasedonCoverageReason:系统间切换只能根据CPICH的RSCP值来判定CPICHRSCPNotenabled:CPICHEc/NO,UETxPower,ULQuality,DLQualityRationalforISHOTriggerusingCPICHRSCPonly:Toavoidunnecessaryping-pongISHOinareasofslightpilotpollutionwithinUrbancityarea,whereCPICHEc/NovaluesmayhittheplannedthresholdtotriggerISHOunnecessarily.,Option,Presentation/Author/5/22/2020,系统间切换信令流程,UE发送切换触发消息到RNC后，RNC发送RRC消息“MeasurementControl”到UE，指导UE对目标GSM小区进行测量，并周期性发回测量报告收到UE上报的测量报告后，RNC应用“滑动平均窗口”对所有测量值进行对比分析，以决定IS-HO,RNC,RRC:”Measurementcontrol”message(GSMRSSImeasurements),UE,RNC,RXLEVmeasurementsarereportedthrough”Measurementreport”messages,UE,RRC:”Measurementreport”,RRC:”Measurementreport”,ThefirstmeasurementreporthasinfofromthebestGSMcell:BCCHfreq&RSSI,nofilteringusedinUE,GsmMeasRepInterval(default0.5s),Presentation/Author/5/22/2020,CompressedModeProcedure,RNCinformsUEofCMpatternand2GneighbourlistinRRC:MeasurementControlmessage3GPPstatesthattheUEmustbecapableofrecordingaminimumnumberofGSMRSSImeasurementsamplespertransmissiongapGSMRSSImeasurementsaremadewithoutacquiringGSMsynchronisationUEreportsonstrongest6GSMneighboursatperiodicintervaldefinedbyGSMMeasRepIntervalRNCappliesaslidingaveragingwindowtothemeasurementsprovidedbytheUERNCinstructsUEtoperformBSICverification(AMR=always,PS=asrequired)usingnewCMpatternBSICverificationneedssynchronisationtoGSMframe,Presentation/Author/5/22/2020,系统间测量与压缩模式,压缩模式：通过降低扩频因子、打孔方式或者PSScheduling，把信息压缩在较短帧长内发送,以腾出时间进行系统间(频率间)测量。影响:相比正常情况，压缩模式需要更多的功率，容易对覆盖造成影响。在压缩模式下，功率控制不再工作,容易造成更多干扰,影响网络容量。,Presentation/Author/5/22/2020,容量损失2G-AMRSignalingFlow,BSICverificationalwaysperformedforAMRcallsnointerruptinvoicecall,Presentation/Author/5/22/2020,InmostcasesBSICverificationisnotrequired(datainterruptasUEmovesto2G)PSmakesuseofRRC:CELLCHANGEORDERFROMUTRANmessage,UE,NodeB,RNC,RRC:MeasurementReport,RRC:MeasurementControl,NBAP:RadioLinkReconfigurationPrepare,NBAP:RadioLinkReconfigurationReady,NBAP:RadioLinkReconfigurationCommit,RRC:PhysicalChannelReconfiguration,RRC:PhysicalChannelReconfigurationComplete,NBAP:CompressedModeCommand,RRC:MeasurementReport,RRC:MeasurementControl,GSMRSSIMeasurement,ISHOtriggering(5reasonsarepossible),InitialCompressedModeConfiguration,CN,RANAP:SRNSContextRequest,RANAP:SRNSContextResponse,RANAP:IUReleaseCommand,RANAP:IUReleaseComplete,RRC:CellChangeOrderfromUTRAN,RANAP:SRNSDataForwardCommand,ISHO3G-2G-PSSignalingFlow,Presentation/Author/5/22/2020,内容,3G/2G基本原理信令流程2Gto3G互操作Ex-SCorepartNSN2G/3G互操作策略建议3G/2G互操作相关参数3GPart2GPart3G/2G互操作相关KPI,Presentation/Author/5/22/2020,2Gto3G互操作,Presentation/Author/5/22/2020,内容,3G/2G基本原理信令流程2G需要的升级Ex-SCorepartNSN2G/3G互操作策略建议3G/2G互操作相关参数3G/2G互操作相关KPI,Presentation/Author/5/22/2020,2G/3G互操作策略需要考虑的问题,2G-3G互操作,业务,覆盖,容量,WCDMA/HSPA,RNC,BSC,GSM/EDGE,CoreNetwork,2G/3G协调发展,充分利用GSM网络吸纳语音业务，增强GPRS/EDGE培养数据业务和3G用户WCDMA/HSDPA重点承载数据业务，同时分担GSM网络话务负荷,网络不同阶段，侧重考虑不同,Presentation/Author/5/22/2020,2G-3G互操作场景示意,WCDMA,WCDMA,GSM,GSM,GSM,GSM,进入WCDMA区域时GSMWCDMA（小区重选）,WCDMA覆盖边缘的WCDMAGSM,GSM,WCDMA,WCDMA,基于业务和负荷的WCDMAGSM,GSM覆盖边缘的GSMWCDMA,基于IMSI的GSMWCDMA,UE触发的GSMWCDMA（小区选择与重选）,2G/3G互操作须与3G网络部署策略结合考虑,室内GSM覆盖WCDMAGSM,Presentation/Author/5/22/2020,3G网络发展不同阶段对功能和互操作的要求,3G城区覆盖3G网络低负荷,双模终端空闲模式驻留选择基于覆盖的3G-2G切换2G核心网发起的业务控制3G-2G紧急呼叫切换,功能需求,切换场景,新业务RTVS,MBMS,onlinegames等开始应用3G负荷增加，Multi-RAB增多HSPA规模应用,新RAT技术新业务新的终端,2G-LTE互操作3G-LTE互操作PSHO多媒体回落高阶DTM时隙,DTMIS-NACC3G-2GDTM切换增强基于业务和负荷的双向切换,3G建设增强期：规模应用,第三阶段：LTE开始商用,3G建设初期：覆盖阶段,Presentation/Author/5/22/2020,3G网络部署初期的互操作示意,GSM,GSM,GSM,WCDMA/HSDPA,WCDMA/HSDPA,WCDMA,GSM,GSM,WCDMA,GSM,双模终端空闲模式驻留在WCDMA,WCDMA,GSM,CS,PS,开始连接,覆盖触发系统间切换,通话继续保持在GSM,通话结束后重选进入WCDMA,GPRS状态的终端通过小区重选进入WCDMA,小区重选进入GSM,Connectedmode,WCDMA,GSM,Presentation/Author/5/22/2020,WCDMA发展现阶段2G3G策略总结,空闲模式,双模终端空闲状态下，通过小区重选优选3G3G用户驻留2G时通过小区重选返回3G,分组业务3G2G双向重选分组业务优选3G,语音用户3G-2G单向切换基于负载的2G到3G切换（仅对2G网络容量紧张的热点区域有选择的使用-Option),PS连接下,CS连接下,对于3G到2G切换，以CPICHRSCP覆盖触发,Presentation/Author/5/22/2020,内容,3G/2G基本原理信令流程2G需要的升级Ex-SCorepartNSN2G/3G互操作策略建议3G/2G互操作相关参数3G/2G互操作相关KPI,Presentation/Author/5/22/2020,Presentation/Author/Date,CellReselection,WCDMA-GSM,Parameters,Presentation/Author/5/22/2020,Presentation/Author/Date,ISHOWCDMA-GSM,Parameters,Presentation/Author/5/22/2020,Presentation/Author/Date,ISHOWCDMA-GSM,Parameters,Presentation/Author/5/22/2020,内容,3G/2G基本原理信令流程2G需要的升级Ex-SCorepartNSN2G/3G互操作策略建议3G/2G互操作相关参数3G/2G互操作相关KPI,Presentation/Author/5/22/2020,Presentation/Author/Date,3G/2G互操作KPI-CS域,系统间CS域切换成功次数（W-G）,定义：在CS域系统间切换出过程中，如果RNC发送HANDOVERFROMUTRANCOMMAND消息后收到IURELEASECOMMAND消息，并且该消息的原因值为“SuccessfulRelocation”、“NormalRelease”或“NetworkOptimization”时，表明本次CS域系统间切换出过程成功.,系统间CS域切换尝试次数（W-G）,定义：在CS域系统间切换出过程中，当RNC向UE发送HANDOVERFROMUTRANCOMMAND消息时统计该指标。,系统间CS域切换成功率（W-G）,M1010C92,M1010C90,M1010C92/M1010C90,定义：系统间CS域切换成功率（WCDMA-GSM）=系统间CS域切换成功次数WCDMA-GSM/系统间CS域切换尝试次数WCDMA-GSM*100%。,Presentation/Author/