CSFB 相关信令流程目录CSFB 相关信令流程........................................................................................................................11移动性管理..............................................................................................................................11.1联合附着流程..............................................................................................................11.2分离流程......................................................................................................................51.3UE 发起的分离流程....................................................................................................51.4MME 发起的分离流程................................................................................................71.5HSS 发起的分离流程..................................................................................................81.6联合 TA/LA 更新流程..................................................................................................81.7周期性 TA/LA 更新....................................................................................................112语音业务................................................................................................................................112.1主叫语音业务.............................................................................................................112.2被叫语音业务.....................................................................................................132.3紧急呼叫业务.....................................................................................................162.3.1带 USIM 卡紧急呼叫业务流程.....................................................................162.3.2不带 USIM 卡紧急呼叫业务流程.................................................................183SGs 短消息业务.................................................................................................................
