信令网_gsm主叫信令流程图_被叫信令(14)

系统收到被叫移动台发送的RELEASE消息后，会向被叫移动台发出RELEASE COMPLETE表示呼叫已经结束。

24 Layer 2 uplink 18:54:07.858 FACCH UI-CMD

确认帧.

25 Layer 3 Downlink 18:54:07.978 FACCH CHANNEL RELEASE

M RR Cause (hex data: 00)

RR Cause value (0): Normal event

MSC收到被叫移动台UA确认消息后，向BSC发出清除命令CLEARCOMMAND，释放所有信令链路，该消息中携带此次呼叫清除原因，到此呼叫连接CC层释放完成。BSC收到清除命令后，一方面向移动台发出释放信道（CHANNELRELEASE）消息，同时要求移动台返回空闲模式。

26 Layer 2 Uplink 18:54:08.017 FACCH DISC-CMD

被叫移动台收到CHANNELRELEASE后，拆除上行信令链路，即拆除上行SACCH随路信令的测量报告，移动台向BTS发出DISC消息.并且返回CCCH空闲模式.

§2.3开机位置更新信令流程

1 Location Update Attempt 18:52:12.464

2 Location Update Accepted 18:52:12.464

Old LAC: n/a

New LAC: 14101

Mobile Country Code: 460

Mobile Network Code: 0

3 Service Information 18:52:12.464 Service received

§2.4跨越LAC区位置更新信令流程

Location updating: successful case

1 Cell Reselection 10:51:52.245 进行了小区选择

Old Cellular System: GSM 900

Old LAC: 14129

Old Cell Identification: 42881

New Cellular System: GSM 900

New LAC: 14085

New Cell Identification: 1091

2 Layer 2 Uplink 10:51:53.593 RACH RANDOM_ACCESS_BURST

3 Layer 3 Uplink 10:51:53.593 RACH CHANNEL REQUEST

申请信道得作用是用于位置更新(代号0C)

M Establishment Cause (hex data: 0c)

Meaning of establishment cause: Location updating and the networksets NECI bit to 1

4 Layer 3 Downlink 10:51:53.656 CCCH IMMEDIATE ASSIGNMENT

指配命令中,包含信道类别,如话音数据指示,信道速率和类别以及话音解码算法

5 Layer 3 Uplink 10:51:53.888 SDCCH LOCATION UPDATING REQUEST

该消息中携带有移动台TMSI和LAC号码且注明了申请信道得作用是用于位置更新.MSC收到此消息后,将此消息发给VLR,VLR将更新移动台得位置信息,存储新的LAC号码.并向移动台发出一个新的TMSI,

M Location Updating Type (hex data: 0)

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