【文章內(nèi)容簡介】 的內(nèi)容有誤 ? 手機發(fā)現(xiàn) Assignment Command消息中內(nèi)容有誤，手機發(fā) Assignment Failure消息到BSC ? BSC收到該消息后在 A接口發(fā) Assignment Failure Reversion to Old Channel ? BSC向 BTS發(fā) RF Channel Release消息，釋放新信道 ? T3107超時 ? BSC在 A接口發(fā) Assignment Failure “Radio Interface Message Failure”， 并開始 T9110計時 ? BSC向 BTS發(fā) RF Channel Release消息，釋放新老信道 ? 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 ? 直接重試中的異常情況 ? 沒有 Candidate cell ? BSC在 A接口發(fā) Assignment Failure “No Radio Resource Available” ? 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 ? 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(nèi)部釋放 – Requested transcoding rate not supported (RTRNS) : BSC內(nèi)部釋放 – Encryption algorithm not implemented (EANI) : BSC內(nèi)部釋放 – OM Intervention (OI) : BSC內(nèi)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 Failure TCH分配過程 —— 異常情況 ? 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 ? 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 ? Abis上的其它異常中斷消息的處理 ? 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 ? BSC收到 Error Report消息 ? BSC收到 Error Indication消息 ? BSC收到 Release Indication消息 ? 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 MSC Call Proceeding ESTIN (CM_Serv_Req) RR Connection Establishment RR Connection Establishment RR Connection Establishment Authentication Procedure Authentication Procedure Authentication Procedure Ciphering Procedure Ciphering Procedure Ciphering Procedure TMSI Realloc Procedure TMSI Realloc Procedure TMSI Realloc Procedure SETUP SETUP SETUP Call Proceeding Call Proceeding Assignment Procedure Assignment Procedure Assignment Procedure Alerting Alerting Alerting Connect Connect Connect Connect Ack. Connect Ack. Connect Ack. Speech CM_Serv_Req Off Air Call Setup （ called party nbr） 先建立 TCH， 再接通 B側(cè)信道。Alerting在 TCH上發(fā)送 （ CM Serv Type， Mobile ID，Classmark2， Priority，） SDCCH TCH MS BTS BSC MSC Call Proceeding ESTIN (CM_Serv_Req) RR Connection Establishment RR Connection Establishment RR Connection Establishment Authentication Procedure Authentication Procedure Authentication Procedure Ciphering Procedure Ciphering Procedure Ciphering Procedure TMSI Realloc Procedure TMSI Realloc Procedure TMSI Realloc Procedure SETUP SETUP SETUP Call Proceeding Call Proceeding Assignment Procedure Assignment Procedure Assignment Procedure Alerting Alerting Alerting Connect Connect Connect Connect Ack. Connect Ack. Connect Ack. Speech CM_Serv_Req SDCCH TCH 先接通 B側(cè)信道，再建立 TCH 。Alerting在SDCCH上發(fā)送 主叫過程（ OACSU情況） MS BTS BSC MSC Call Confirmed ESTIN (Paging Resp) RR Connection Establishment RR Connection Establishment RR Connection Establishment Authentication Procedure Authentication Procedure Authentication Procedure Ciphering Procedure Ciphering Procedure Ciphering Procedure TMSI Realloc Procedure TMSI Realloc Procedure TMSI Realloc Procedure SETUP SETUP SETUP Call Confirmed Call Confirmed Assignment Procedure Assignment Procedure Assignment Procedure Alerting Alerting Alerting Connect Connect Connect Connect Ack. Connect Ack. Connect Ack. Speech Paging Response Paging Paging Command Paging Request ST3113 ET3113 Paging 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）） （ MS ID（ TMSI/IMSI），