上海贝尔-GSM呼叫流程.ppt

* T9108 Expiry : the Phys Context Req was lost on the Abis, the Phys Context confirm was lost on the Abis, the BTS is under load and can not respond in time, the BTS is performing a reset or a reconfiguration. In this case the Channel activation is build with the min(P, MS_Tx_Pwr_Max), BS_Tx_Pwr_Max and no Timing Advance. T9103 Expiry : the Chnav was lost on the Abis, the Chnav ack or nack was lost on the Abis, the BTS is under load and can not respond in time, the BTS is performing a reset or a reconfiguration. * * * * C136 : NBR_RTCH_FAIL_ASS : incremented when a TCH transaction, not involving HO, terminates unsuccessfully due to a Radio Failure * SETUP : to indicate a mobile Originating Call establishment (contains the call number) Progress : from the Network to the MS to indicate the progress of a call Call Proceeding : send by the network to the calling MS to indicate that the requested call establishment information has been receivedand no more call establishment will be accepted Alerting : to indicate the called user alerting has been initiated Connect : indicate the call acceptance by the called user Connect Acknowledge : to acknowledge the offered connection * * * Three Location Updating tye : Normal Location updating : used to update the regeistration of the actual LA of a MS in the Network Periodic Location Updating : to notifiy periodically the availability of the mobile in the network. This procedure is controlled by a timer (T3212) in the MS. The timer is stopped and reset to 0 when : LU accept or Reject message is received, MS has respond to a paging, MS is deactivated. IMSI Attach : to activate a MS in the Network If T3210 expires, then T3211 starts. When T3211 reaches 0, the location update procedure is restarted. * If Intracell Handover is disabled, cause 15 16 are switched to cause 2 4 If repetition of Intracell Alarm is disabled, cause 15 16 are switched to cause 2 4 * C10 : incremented when a successfull SDCCH Handover is complete