CSFB重要流程及定义.docxVIP

1.CSFB流程主叫被叫ULLTE NAS-Extended service requestULLTE NAS-Extended service requestDLLTE RRC Connection ReleaseDLLTE RRC Connection ReleaseDLGSM SIB消息DLGSM SIB消息ULGSM Paging requestULGSM Paging responseULCM Service Request　　DLGSM RR Immediate assignmentDLGSM RR Immediate assignmentULGSM RR Classmark changeULGSM RR Classmark changeULGSM RR GPRS suspension requestULGSM RR GPRS suspension requestULSetupDLSetupDLCall ProceedingULCall ConfirmedDLGSM RR Assignment commandDLGSM RR Assignment commandULGSM RR Assignment completeULGSM RR Assignment completeDLGSM AlertingULGSM AlertingDLGSM ConnectULGSM ConnectULGSM DisconnectDLGSM DisconnectDLChannel RelesaeDLChannel RelesaeULLocation Updating RequestULLocation Updating RequestULTracking Area Update RequestULTracking Area Update RequestDLTracking Area Update AcceptDLTracking Area Update Accept重要流程说明:主叫：1.LTE NAS-Extended service request：扩展服务请求，及CSFB开始的标志；2.LTE RRC Connection Release：UE回落过程中LTE侧最后一条信令，携带UE测量到的GSM频点；3.CM Service Request：UE成功回落到GSM的标志，被叫为GSM Paging response。（回落GSM或TD后发生位置更新并直接下行setup进行呼叫流程时以setup作为终点）；4. Call Proceeding/ Call Confirmed：主叫进行呼叫/被叫确认呼叫；5.GSM Alerting：振铃；6.GSM Connect：接通；7.GSM Disconnect：断开连接，挂断；8.Channel Release：信道释放，准备返回LTE；9.Tracking Area Update Accept：返回LTE成功；2.相关定义1．CSFB回落GSM定义起点：LTE下起呼后的RRC Connection Release终点：GSM下主叫CM Service Request，被叫 paging response（*回落GSM或TD后发生位置更新并直接下行setup进行呼叫流程时以setup作为终点）起点——终点的时间间隔为CSFB回落GSM时延（取主被叫）? CSFB回落GSM成功次数起点、终点均有时计为一次成功? CSFB回落GSM失败次数起点或终点任意一项没有时计为失败，进一步解释为，当无RRC Connection Release时计为失败，当下次起呼开始时仍未进行回落呼叫计为失败。CSFB回落GSM成功率定义分子：主被叫CSFB回落GSM成功次数分母：主被叫LTE下起呼Extending Service Request次数二者之比。2.CSFB GSM返回LTE定义起点：LTE下起呼回落GSM后释放信令RR channel Release 终点：返回LTE下收到Tracking area update accept 起点——终点的时间间隔为CSFB GSM返回LTE时延（取主被叫）? CSFB GSM返回成功次数起点、终点均有时计为一次成功? CSFB GSM返回失败次数起点或终点任意一项没有时计为失败，即释放时无RR channel Release计为失败，当下一次起呼时仍未进行收到Tracking area update accept计为失败。3.接通定义起点：LTE下起呼后的Extended Service Request终点：GSM下收到Alerting起点--终点的时间间隔为CSFB接通时延? CSFB GSM返回成功次数起点、终点均有时计为一次成功? CSFB GSM返回失