诺西2G3G互操作

nullNSN 2G-3G互操作NSN 2G-3G互操作NSN Competence Team内容3G/2G基本原理 信令 NSN 2G/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 2G/3G 互操作优化GSM – WCDMA 互操作GSM – WCDMA 互操作GSM – WCDMA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Penalty timers, re-selection timers3G/2G 互操作的实现3G/2G 互操作的实现方法Idle Mode/PS connected ModeConnected Mode AMR ISHOCell ReselectionInter-RAT HOS- / R-准则压缩模式 GSM系统升级 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 Refer to ‘3GPP 04.18’升级要求升级要求In Idle ModeIn Idle ModeNormally cell re-selection is done to cell having better coverage. Both quality (CPICH Ec/No) and rxlevel (CPICH RSCP) should be good enough in the neighbour cell before cell re-selection can happen Signal quality & level requirements are checked with S-criteria Cell Ranking with R-criteria is done to select the best cell from all cells fulfilling S-criteria,Cell selection: S准则Cell selection: S准则Cell selection: S准则Cell selection: S准则Squal = Qqualmeas (CPICH Ec/No) – QqualMin Srxlev = Qrxlevmeas – QrxlevMin - PcompensationCell selection: S准则Cell selection: S准则通过S准则，找出SUITABLE CELLCell Re-selection: R准则Cell Re-selection: R准则R准则：重选出一个最好小区提供服务Cell Reselection 3G -> 2G ProcedureCell Reselection 3G -> 2G ProcedureFirst ranking of all the cells based on CPICH RSCP (WCDMA) and RSSI (GSM) Rs = CPICH RSCP + Qhyst1 Rn= Rxlev(n) - Qoffset1Rn (GSM) > Rs (WCDMA) And Rxlev (GSM) >QrxlevMin YesNoCell re-selection to GSM Neighbour WCDMA or GSM cell calculation with offset parameterServing WCDMA cell calculation, with hysteresis parameterUE starts GSM measurements if CPICH Ec/No < qQualMin + sSearchRAT SintraSearchSinterSearchSsearchRATCPICH EcNoqQualMinSecond ranking only for WCDMA cells based on CPICH Ec/No Rs = CPICH Ec/No + Qhyst2 Rn=CPICH_Ec/No(n)-Qoffset2Cell re-selection to WCDMA cell of highest R value 现网设置Qqualmin= -18dB sSearchRAT=2（2*2=4） Qhyst1=0，Qhyst2=1（1*2），Qoffset1=0Cell Re-selection: R准则Cell Re-selection: R准则Serving cell parameters Sintrasearch, Sintersearch and SsearchRAT (Intra-, Inter-frequency, Inter-RAT Measurement Thresholds respectively) are compared with Squal (CPICH Ec/No - Qqualmin) in S-criteria for cell re-selection. UE will measure neighbour cells depending on how the measurement threshold parameters are set & sent (if parameters are not sent, UE shall measure all cells) 1 None (Squal > Sintrasearch ) – UE need not perform intra-frequency measurements. 2 WCDMA intra-frequency (Sintersearch < Squal  Sintrasearch) 3 WCDMA intra- and inter- frequency, no inter-RAT cells (SsearchRAT < Squal  Sintersearch) 4 WCDMA intra- and inter-frequency and inter-RAT cells (Squal  SsearchRAT ) WCDMA to WCDMA Cell Re-selection WCDMA to WCDMA Cell Re-selection Qmeas (CPICH Ec/No)tServing WCDMA CellNeighbour WCDMA CellQhyst2RSintrasearch Sintersearch SsearchRATRsRnQqualminSqualsMeasurement of all WCDMA neighbours is startedThese parameters are used to avoid ping pong effect in cell re-selection Qoffset2 parameters for WCDMA neighbours Thresholds used with S-criteria in serving cell Note: Rs = Serving WCDMA Cell Rn = Neighbour WCDMA Cell WCDMA to GSM Cell Re-selection NSN Strategy: reselect to GSM early WCDMA to GSM Cell Re-selection NSN Strategy: reselect to GSM early Qmeas (CPICH Ec/No)tServing WCDMA CellNeighbour GSM CellQhyst1=4 dBAdjgQoffset1=0 dB SsearchRAT= 4dBRsQqualmin= -18dBSqualsGSM Measurements starts when Squal= CPICH Ec/No-Qqualmin  SsearchRAT: i.e. CPICH Ec/No  -14 dB Rn > Rs => Cell re-selection To GSMRsNote: Rs = Serving WCDMA Cell Rn = Neighbour GSM Cell Qhyst1=0Idle Mode Cell Reselection ParameterIdle Mode Cell Reselection ParameterWCEL: Qhyst1 (Qhyst2) Qhyst1 is used for TDD and GSM cells, and for FDD cells when cell selection and re-selection quality measure is set to CPICH RSCP (CPICH Ec/No) (Qhyst1s/ Qhyst2s). This parameter is part of SIB 3. [0 ... 40] dB, step 2 dB, default: 4 dB. HOPS: AdjsQoffset1 (AdjsQoffset2) This parameter is used in the cell re-selection and ranking between WCDMA cells. The value of this parameter is subtracted from the measured CPICH RSCP (CPICH Ec/No) of the intra-frequency neighbour cell before the UE compares the quality measure with the cell re-selection/ranking criteria. [-50 ... 50] dB, default: 0 dB. HOPS: AdjsQoffset1 (AdjsQoffset2), HOPG: AdjgQoffset1, (AdjgQoffset2) WCELL: Treselection The UE triggers the reselection of a new cell if the cell reselection criteria are fulfilled during the time interval Treselection. This parameter is part of SIB 3. [0 ... 31] seconds, default: 0 seconds. 现网设为2s，重选速度变慢，但可能减少乒乓重选Crucial Cell (Re-)selection ParametersCrucial Cell (Re-)selection ParametersMinimum required CPICH RSCP/RXLEV of the neighbour cell for cell re-selection GSMncellQrxlevMin (RXLEV, -110..-47 dBm, step 2, default -105 dBm) InterFreqNcellQrxlevMin, IntraFreqNcellQrxlevMin (CPICH RSCP, -115 ... -25 dBm, step 2 dBm, default -115 dBm) InterFreqNcellQqualMin, IntraFreqNcellQqualMin (Ec/No, -20 ... 0 dB, step 1 dB, default -20 dB) Offset values (CPICH RSCP/RXLEV) to be subtracted from neighbour cell before quality comparison (re-selection & ranking) InterFreqNcellQoffset1, IntraFreqNcellQoffset1, GSMncellQoffset1 InterFreqNcellQoffset2, IntraFreqNcellQoffset2 Range -50 ... 50 dB, step 1 dB, default 0 dB Hysteresis values of serving cell used in ranking R- criteria Qhyst1 (for GSM cells RSSI, WCDMA CPICH RSCP) Qhyst2 (for WCDMA cells CPICH Ec/No) Range 0 ... 40 dB, step 2 dB, default 0 dB In Connected ModeIn Connected ModeTriggers for Connected Mode ISHO shall be based on Coverage Reason:系统间切换只能根据CPICH的RSCP值来判定 CPICH RSCP Not enabled: CPICH Ec/NO, UE Tx Power, UL Quality, DL Quality Rational for ISHO Trigger using CPICH RSCP only: To avoid unnecessary ping-pong ISHO in areas of slight pilot pollution within Urban city area, where CPICH Ec/No values may hit the planned threshold to trigger ISHO unnecessarily. Option系统间切换信令流程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“Measurement Control”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，以决定 IS-HORNCRRC: ”Measurement control ” message (GSM RSSI measurements)UERNCRXLEV measurements are reported through ”Measurement report” messagesUERRC: ”Measurement report”RRC: ”Measurement report”The first measurement report has info from the best GSM cell: BCCH freq & RSSI, no filtering used in UEGsmMeasRepInterval (default 0.5s)Compressed Mode ProcedureRNC informs UE of CM pattern and 2G neighbour list in RRC: Measurement Control message 3GPP states that the UE must be capable of recording a minimum number of GSM RSSI measurement samples per transmission gap GSM RSSI measurements are made without acquiring GSM synchronisation UE reports on strongest 6 GSM neighbours at periodic interval defined by GSMMeasRepInterval RNC applies a sliding averaging window to the measurements provided by the UE RNC instructs UE to perform BSIC verification (AMR=always, PS=as required) using new CM pattern BSIC verification needs synchronisation to GSM frameCompressed Mode Procedure系统间测量与压缩模式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PS Scheduling，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。压缩模式对容量的影响压缩模式对容量的影响容量损失 <1%Eb/N0实际的增加取决于业务、多径、天线分集、终端移动速度、 上下行的差别、测量时长，以及实现压缩模式的方式 (降低扩频因子或打孔)压缩模式对覆盖影响压缩模式对覆盖影响覆盖减小～ 2.1 dBCompressed modeMobile max. power2.7 dB + 1.5 dB more power is needed during compressed mode 非实时业务可以通过降低比特率来适配压缩帧 不会对覆盖造成影响 话音业务可以相应动态调整到低速率的AMR语音编码，以适配压缩帧ISHO 3G -> 2G - AMR Signaling FlowISHO 3G -> 2G - AMR Signaling FlowBSIC verification always performed for AMR calls – no interrupt in voice callISHO 3G -> 2G - PS Signaling Flow ISHO 3G -> 2G - PS Signaling Flow In most cases BSIC verification is not required (data interrupt as UE moves to 2G) PS makes use of RRC: CELL CHANGE ORDER FROM UTRAN messageUENode BRNCRRC: Measurement ReportRRC: Measurement ControlNBAP: Radio Link Reconfiguration PrepareNBAP: Radio Link Reconfiguration ReadyNBAP: Radio Link Reconfiguration CommitRRC: Physical Channel ReconfigurationRRC: Physical Channel Reconfiguration CompleteNBAP: Compressed Mode CommandRRC: Measurement ReportRRC: Measurement ControlGSM RSSI MeasurementISHO triggering (5 reasons are possible)Initial Compressed Mode ConfigurationCNRANAP: SRNS Context RequestRANAP: SRNS Context ResponseRANAP: IU Release CommandRANAP: IU Release CompleteRRC: Cell Change Order from UTRANRANAP: SRNS Data Forward Command内容内容3G/2G基本原理 信令流程 2G to 3G 互操作 Ex-S Core part NSN 2G/3G互操作策略建议 3G/2G互操作相关参数 3G Part 2G Part 3G/2G互操作相关KPI2G to 3G 互操作2G to 3G 互操作内容内容3G/2G基本原理 信令流程 2G 需要的升级 Ex-S Core part NSN 2G/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互操作策略需要考虑的问 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 / HSPARNCBSCGSM / EDGECore Network2G/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2G-3G互操作场景示意2G-3G互操作场景示意WCDMAWCDMAGSMGSMGSMGSM进入WCDMA区域时 GSM WCDMA （小区重选）WCDMA覆盖边缘的 WCDMA  GSMGSMWCDMAWCDMA基于业务和负荷的 WCDMA  GSMGSM覆盖边缘的 GSM WCDMA基于IMSI的 GSM  WCDMAUE触发的 GSM  WCDMA （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 WCDMA  GSM3G网络发展不同阶段对功能和互操作的要求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, online games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 PS HO 多媒体回落 高阶DTM时隙DTM IS-NACC 3G->2G DTM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3G网络部署初期的互操作示意3G网络部署初期的互操作示意GSMGSMGSMWCDMA/HSDPAWCDMA/HSDPAWCDMAGSM GSMWCDMAGSM双模终端空闲模式 驻留在WCDMAWCDMAGSM CSPS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WCDMAGPRS状态的终端通过 小区重选进入WCDMA小区重选进入GSMConnected modeWCDMAGSMWCDMA发展现阶段2G3G策略 总结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3G 3G用户驻留2G时通过小区重选返回3G 分组业务3G<->2G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CPICH RSCP覆盖触发内容内容 3G/2G基本原理 信令流程 2G 需要的升级 Ex-S Core part NSN 2G/3G互操作策略建议 3G/2G互操作相关参数 3G/2G互操作相关KPICell Reselection, WCDMA -> GSM, ParametersPresentation / Author / Date Cell Reselection, WCDMA -> GSM, ParametersISHO WCDMA -> GSM, ParametersPresentation / Author / Date ISHO WCDMA -> GSM, ParametersISHO WCDMA -> GSM, ParametersPresentation / Author / Date ISHO WCDMA -> GSM, Parameters内容内容3G/2G基本原理 信令流程 2G 需要的升级 Ex-S Core part NSN 2G/3G互操作策略建议 3G/2G互操作相关参数 3G/2G互操作相关KPI3G/2G互操作KPI-CS域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HANDOVER FROM UTRAN COMMAND消息后收到IU RELEASE COMMAND消息，并且该消息的原因值为“Successful Relocation”、“Normal Release”或“Network Optimization”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HANDOVER FROM UTRAN COMMAND消息时统计该指标。系统间CS域切换成功率（W->G） M1010C92M1010C90M1010C92/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%。3G/2G互操作KPI-PS域 Presentation / Author / Date 3G/2G互操作KPI-PS域 系统间PS域切出成功次数定义：在PS域系统间切换出过程中，RNC如果收到IU RELEASE COMMAND消息，并且该消息的原因值为“Successful Relocation”、“Normal Release”或“Network Optimization”时，并发送了RANAP IU RELEASE COMPLETE消息，表明本次PS域系统间切换出过程成功，此时统计该指标 系统间PS域切出尝试次数 定义：在PS域系统间切换出过程中，当RNC发送CELL CHANGE ORDER FROM UTRAN消息时，统计该指标。系统间PS域切出成功率M1010C93M1010C91M1010C93/M1010C91定义：系统间PS域切出成功率＝切出成功次数 / 切出尝试次数*100% 3G/2G互操作KPI-PS域 Presentation / Author / Date 3G/2G互操作KPI-PS域 系统间PS域切入成功次数定义：RNC收到UE返回的RRC CONNECTION SETUP COMPLETE消息后，根据RRC CONNECTION REQUEST消息中的RRC连接请求原因（Inter-RAT cell re-selection）统计。系统间PS域切入尝试次数 定义：RNC收到来自UE的RRC CONNECTION REQUEST消息后，如果该消息合法，并且不是来自同一个UE重复上报的，则根据RRC连接请求原因（Inter-RAT cell re-selection）统计。 系统间PS域切入成功率M1010C219-M1001C220M1010C219（M1001C219- M1001C220）/ M1001C219定义：系统间PS域切入成功率= [系统间PS域切入成功次数] / [系统间PS域切入请求次数] *100%。3G/2G互操作优化 Presentation / Author / Date 3G/2G互操作优化 谢　谢 谢　谢