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gsm呼叫流程,絕對經(jīng)典(ppt40頁)-資料下載頁

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【正文】 f Channel Activation Channel Act Ack. HO Command HO Command HO Access HO Detection SABM Establish Ind UA Handover Complete Handover Complete Handover Performed RF Channel Release RF Channel Rel. Ack. ST9108 ET9108 ST9103 ET9103 ST3103 ST3103 ST3106 ET3106 ST_RCR_ACK ET_RCR_ACK ST200 ET200 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 MSC BTStarget HO Alarm Candidate Cell Channel Activation Channel Act Ack. HO Command HO Command HO Access HO Detection SABM Establish Ind UA Handover Complete Handover Complete Handover Performed RF Channel Release RF Channel Rel. Ack. ST9103 ET9103 ST3103 ST3103 ST3105 ET3105 Physical Info ST3124 ET3124 ST200 ET200 ST_RCR_ACK ET_RCR_ACK Phys Context Req Phys Context Conf ST9108 ET9108 Meas 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 ? TCH擁塞 ? Internal Inter Cell切換將不會發(fā)生 ? T9108超時(同步切換) ? 同 Intra Cell情況 ? T9103超時 ? 同 Intra Cell情況 ? BSC收到 Channel Activation Negative Acknowledge消息 ? 同 Intra Cell情況 Internal Inter Cell切換過程 —— 異常情況 ? 在原來的信道上(如 SDCCH信道)收到 HO Failure消息 ? Internal Inter Cell切換過程將終止 ? A接口上不會有任何消息傳送 ? BSC向 BTS發(fā) RF Channel Release消息,釋放新信道 ? HO Command的內(nèi)容有誤,手機發(fā) HO Failure消息到 BSC ? Internal Inter Cell切換過程將終止 ? A接口上不會有任何消息傳送 ? BSC向 BTS發(fā) RF Channel Release消息,釋放新信道 ? T3103超時 ? BSC在 A接口發(fā) Clear Request “Radio Interface Message Failure” ? BSC向 BTS發(fā) RF Channel Release消息,釋放新老信道 ? 形成切換掉話 ? 其它異常中斷消息 ? Error Report ? Connection Failure Indication ? Release Indication ? Error Indication Internal Inter Cell切換過程 —— 異常情況 MS BTSserving BSCserving MSC BTStarget Meas Report Meas Result HO Alarm Candidate Cell Channel Activation Channel Act Ack. HO Command HO Command HO Access HO Detection SABM Establish Ind UA Handover Complete Handover Complete HO Complete RF Channel Release RF Ch. Rel. Ack. BSCtarget HO Required HO Request HO Request Ack. HO Command Phys Information ( SCCP Con Required) ( SCCP Con Conf) . Clear Command Clear Complete SCCP Released SCCP Rel. Cmp. STrr2 ET3124 ETrr2 ST_HO_REQ_Lost ST9103 ST9103 ST9113 ST3103 ET3103 ST3124 ST200 ET200 ST3106 ET3106 ST8 ET8 External Inter Cell切換過程 ——異步切換 ET9113 ET_HO_REQ_Lost ? T8 超時 ? 服務 BSC在 A接口發(fā) Clear Request “Radio Interface Message Failure” ? 服務 BSC向 BTS發(fā) RF Channel Release消息,釋放老信道 ? 形成切換掉話 ? T9113 Expiry ? 目標 BSC在 A接口發(fā) HO Failure “Radio Interface Failure” ? 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 MSC Disconnect Disconnect Disconnect Release Release Release Release Complete Release Complete Release Complete 手機觸發(fā)的呼叫釋放 Disconnect Disconnect Disconnect Release Release Release Release Complete Release Complete Release Complete 網(wǎng)絡觸發(fā)的呼叫釋放 呼叫釋放過程 ? 信道釋放時 ? 空中接口和 A接口的釋放過程是同時、獨立進行的 ? 空中接口的信道釋放過程 ? BSC發(fā) Channel Release消息給手機 ? 無線鏈路失敗 ? A接口的釋放過程 ? MSC發(fā) CLEAR COMMAD到 BSC觸發(fā) A接口的釋放過程 ? 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 MSC DISC (DCH) Channel Release (DCH) Deactivate SACCH Release Indication UA Phy Context Request Phy Context Confirm RF Channel Release RF Channel Release Ack ET3110 ST3110 ST3111 T3111 Expiry ST9108 ET9108 ST_RCR_ACK ET_RCR_ACK BSC發(fā) Channel Release 消息到手機 No SACCH received from the MS Connection Fail Ind RF Channel Release RF Channel Release Ack ST_RCR_ACK ET_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 MSC BSC Clear Request Clear Command Clear Complete SCCP Released SCCP Released Complete BSC觸發(fā)的釋放 Clear Command Clear Complete SCCP Released SCCP Released Complete MSC觸發(fā)的釋放 ST9104 ET9104 ST9101 ET9101 ST9101 ET9101 信道釋放過程 —— A接口釋放 演講完畢,謝謝觀看!
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