【文章內容簡介】 nment Failure消息到BSCp BSC收到該消息后在 A接口發(fā) Assignment Failure Reversion to Old Channelp BSC向 BTS發(fā) RF Channel Release消息，釋放新信道t T3107超時p BSC在 A接口發(fā) Assignment Failure “Radio Interface Message Failure”， 并開始 T9110計時p BSC向 BTS發(fā) RF Channel Release消息，釋放新老信道p MSC向 BSC發(fā) Clear Command消息（呼叫釋放），并停止 T9110一般情況下，交換機收到該消息后發(fā) DISC（ temp fail）TCH分配過程 —— 異常情況t 直接重試中的異常情況p 沒有 Candidate cell BSC在 A接口發(fā) Assignment Failure “No Radio Resource Available”p Channel Activation過程中 T9103超時 BSC在 A接口發(fā) Assignment Failure “Radio Interface Failure” BSC向 BTS發(fā) RF Channel Release消息p BSC收到 Channel Activation Negative Acknowledge消息 Channel Activation Negative Acknowledge有以下幾種原因 :– Channel Already Activated (CAA): BSC向手機和 BTS發(fā)信道釋放消息– Radio Resource Not Available (RRNA) Protocol error (PE) : BSC內部釋放– Requested transcoding rate not supported (RTRNS) : BSC內部釋放– Encryption algorithm not implemented (EANI) : BSC內部釋放– OM Intervention (OI) : BSC內部釋放 在 A接口上發(fā) Assignment Failure消息– 對于收到 Chnav Neg Ack原因為 EANI的情況， Assignment Failure的 cause為 Ciphering Algorithm not supported– 其它情況， Assignment Failure的 cause為 Radio Interface FailureTCH分配過程 —— 異常情況p T3103超時 : 沒有收到 HO Failure或 HO Complete消息 BSC在 A接口發(fā) Assignment Failure “Radio Interface message Failure” BSC向手機和 BTS發(fā)信道釋放消息，釋放新老信道p 收到手機發(fā)來的 HO Failure消息 BSC在 A接口發(fā) Assignment Failure “Reversion to Old Channel”消息 BSC向 BTS發(fā) RF Channel Release消息，釋放新信道t Abis上的其它異常中斷消息的處理p BSC收到 Connection Failure Indicaiton消息 Cause為 : – “Radio Interface Failure” : 無線鏈路超時引起的釋放 釋放：– A接口上， BSC發(fā) Clear Request “Radio Interface Failure”到交換機– BSC向 BTS發(fā) RF Channel Release消息p BSC收到 Error Report消息p BSC收到 Error Indication消息p BSC收到 Release Indication消息t A中繼信道擁塞或不可用情況TCH分配過程 —— 異常情況主叫過程（非 OACSU情況）MS BTS BSC MSCCall ProceedingESTIN (CM_Serv_Req)RR Connection Establishment RR Connection Establishment RR Connection EstablishmentAuthentication Procedure Authentication Procedure Authentication ProcedureCiphering Procedure Ciphering ProcedureCiphering ProcedureTMSI Realloc Procedure TMSI Realloc Procedure TMSI Realloc ProcedureSETUP SETUPSETUPCall Proceeding Call ProceedingAssignment Procedure Assignment Procedure Assignment ProcedureAlertingAlertingAlertingConnectConnectConnectConnect Ack. Connect Ack. Connect Ack.SpeechCM_Serv_ReqOff Air Call Setup（ called party nbr）先建立 TCH， 再接通 B側信道。Alerting在 TCH上發(fā)送（ CM Serv Type， Mobile ID，Classmark2， Priority，）SDCCHTCHMS BTS BSC MSCCall ProceedingESTIN (CM_Serv_Req)RR Connection Establishment RR Connection Establishment RR Connection EstablishmentAuthentication Procedure Authentication Procedure Authentication ProcedureCiphering Procedure Ciphering ProcedureCiphering ProcedureTMSI Realloc Procedure TMSI Realloc Procedure TMSI Realloc ProcedureSETUP SETUPSETUPCall Proceeding Call ProceedingAssignment Procedure Assignment Procedure Assignment ProcedureAlertingAlertingAlertingConnectConnectConnectConnect Ack. Connect Ack. Connect Ack.SpeechCM_Serv_ReqSDCCHTCH先接通 B側信道，再建立 TCH 。Alerting在SDCCH上發(fā)送主叫過程（ OACSU情況）MS BTS BSC MSCCall ConfirmedESTIN (Paging Resp)RR Connection Establishment RR Connection Establishment RR Connection EstablishmentAuthentication Procedure Authentication Procedure Authentication ProcedureCiphering Procedure Ciphering ProcedureCiphering ProcedureTMSI Realloc Procedure TMSI Realloc Procedure TMSI Realloc ProcedureSETUP SETUPSETUPCall Confirmed Call ConfirmedAssignment Procedure Assignment Procedure Assignment ProcedureAlertingAlertingAlertingConnectConnectConnectConnect Ack. Connect Ack. Connect Ack.SpeechPaging ResponsePagingPaging CommandPaging Request ST3113ET3113Paging Group的個數(shù)（ N）： 由 BS_AG_BLKS_RES和 BS_PA_MFRMS決定 。MS的 Paging Group = (IMSI mod 1000) mod N。MS只監(jiān)聽自己對應的 Paging Group的 Paging Req消息（ MS ID（ TMSI/IMSI）， Cell ID（ LAC/LAC+CI））