【正文】 Phys Context ReqPhys Context ConfChannel ActivationChannel Act Ack.HO CommandHO CommandHO AccessHO DetectionSABMEstablish IndUAHandover Complete Handover CompleteHandover PerformedRF Channel ReleaseRF Channel Rel. Ack.ST9108ET9108ST9103ET9103ST3103ST3103ST3106ET3106ST_RCR_ACKET_RCR_ACKST200ET200原信道上的 TA、 被沿用到了新的信道上，而MS/BS_TxPwr將用最大功率在新的信道上發(fā)射（ AB， DCH）（ Cell， MA， MAIO， HSN， TS， TA）（ TA被采用）Internal Inter Cell切換過程 —— 同步切換MS BTSserving BSC MSCBTStargetHO Alarm Candidate CellChannel ActivationChannel Act Ack.HO CommandHO CommandHO AccessHO DetectionSABMEstablish IndUAHandover Complete Handover CompleteHandover PerformedRF Channel ReleaseRF Channel Rel. Ack.ST9103ET9103ST3103ST3103ST3105ET3105Physical InfoST3124ET3124ST200ET200ST_RCR_ACKET_RCR_ACKPhys Context ReqPhys Context ConfST9108ET9108Meas Report Meas Result沒有 Physical Cont Req過程，原信道上的TA不能被沿用到新的信道上測量 TA（ TA）（ TA被采用）在 RF信道釋放前，有 Physical Context Req過程Internal Inter Cell切換過程 —— 異步切換t TCH擁塞p Internal Inter Cell切換將不會發(fā)生t T9108超時（同步切換）p 同 Intra Cell情況t T9103超時p 同 Intra Cell情況t BSC收到 Channel Activation Negative Acknowledge消息p 同 Intra Cell情況Internal Inter Cell切換過程 —— 異常情況t 在原來的信道上（如 SDCCH信道）收到 HO Failure消息 p Internal Inter Cell切換過程將終止p A接口上不會有任何消息傳送p BSC向 BTS發(fā) RF Channel Release消息，釋放新信道t HO Command的內(nèi)容有誤，手機發(fā) HO Failure消息到 BSCp Internal Inter Cell切換過程將終止p A接口上不會有任何消息傳送p BSC向 BTS發(fā) RF Channel Release消息，釋放新信道t T3103超時p BSC在 A接口發(fā) Clear Request “Radio Interface Message Failure”p BSC向 BTS發(fā) RF Channel Release消息，釋放新老信道p 形成切換掉話t 其它異常中斷消息p Error Reportp Connection Failure Indicationp Release Indicationp Error IndicationInternal Inter Cell切換過程 —— 異常情況MS BTSserving BSCserving MSCBTStargetMeas ReportMeas Result HO Alarm Candidate CellChannel ActivationChannel Act Ack.HO CommandHO CommandHO Access HO DetectionSABMEstablish IndUAHandover Complete Handover Complete HO CompleteRF Channel ReleaseRF Ch. Rel. Ack.BSCtargetHO RequiredHO RequestHO Request Ack.HO CommandPhys Information（ SCCP Con Required）（ SCCP Con Conf） .Clear CommandClear CompleteSCCP ReleasedSCCP Rel. Cmp.STrr2ET3124ETrr2ST_HO_REQ_LostST9103ST9103ST9113ST3103ET3103ST3124ST200ET200ST3106ET3106ST8ET8External Inter Cell切換過程 ——異步切換ET9113ET_HO_REQ_Lostt T8 超時p 服務(wù) BSC在 A接口發(fā) Clear Request “Radio Interface Message Failure”p 服務(wù) BSC向 BTS發(fā) RF Channel Release消息，釋放老信道p 形成切換掉話t T9113 Expiryp 目標 BSC在 A接口發(fā) HO Failure “Radio Interface Failure”p 目標 BSC向 BTS發(fā) RF Channel Release消息，釋放新信道External Inter Cell切換過程 ——異常情況MS BTS BSC MSCDisconnectDisconnect DisconnectRelease ReleaseReleaseRelease Complete Release CompleteRelease Complete手機觸發(fā)的呼叫釋放DisconnectDisconnect DisconnectRelease ReleaseReleaseRelease Complete Release CompleteRelease Complete網(wǎng)絡(luò)觸發(fā)的呼叫釋放呼叫釋放過程t 信道釋放時p 空中接口和 A接口的釋放過程是同時、獨立進行的t 空中接口的信道釋放過程p BSC發(fā) Channel Release消息給手機p 無線鏈路失敗t A接口的釋放過程p MSC發(fā) CLEAR COMMAD到 BSC觸發(fā) A接口的釋放過程p BSC 發(fā) CLEAR REQUEST到 MSC觸發(fā) A接口的釋放過程信道釋放過程MS BTS BSC MSCDISC (DCH)Channel Release (DCH)Deactivate SACCHRelease IndicationUAPhy Context RequestPhy Context ConfirmRF Channel ReleaseRF Channel Release AckET3110ST3110ST3111T3111 ExpiryST9108ET9108ST_RCR_ACKET_RCR_ACKBSC發(fā) Channel Release消息到手機No SACCH received from the MSConnection Fail IndRF Channel ReleaseRF Channel Release AckST_RCR_ACKET_RCR_ACK無線鏈路失敗情況一定要等待 T3111后才能釋放BTS信道，這樣可以保證 UA消息有充足的時間發(fā)下信道釋放過程 —— 空中接口的信道釋放MSCBSCClear RequestClear CommandClear CompleteSCCP ReleasedSCCP Released CompleteBSC觸發(fā)的釋放Clear CommandClear CompleteSCCP ReleasedSCCP Released CompleteMSC觸發(fā)的釋放ST9104ET9104ST9101ET9101ST9101ET9101信道釋放過程 ——A 接口釋放演講完畢，謝謝觀看