信令流程（寻呼、短信、切换）

1 基本呼叫过程 ............................................................................................................................. 2

1.1 移动用户呼叫移动用户主叫侧完整过程（主叫释放） ............................................. 2 1.2 移动用户呼叫移动用户被叫侧完整过程（被叫释放） ........................................... 10 1.3 固定用户呼叫移动用户完整过程 ............................................................................... 17 1.4 移动用户呼叫固定用户完整过程 ............................................................................... 22 1.5 呼叫重建过程 ............................................................................................................... 26 2 位置更新过程 ........................................................................................................................... 27

2.1 第一次位置更新（TMSI再分配） ............................................................................ 27 2.2 VLR内部的位置更新 .................................................................................................... 29 2.3 改变VLR时的位置更新 ............................................................................................. 34 3 IMSI附着过程 ......................................................................................................................... 40

3.1 IMSI分离过程 ............................................................................................................. 40 4 切换........................................................................................................................................... 44

4.1 小区内切换 ................................................................................................................... 44 4.2 BSC内的小区间切换 .................................................................................................... 46 4.3 MSC内的BSC间切换 .................................................................................................... 48 4.4 MSC间切换 .................................................................................................................... 50 4.5 强迫切换 ....................................................................................................................... 54 5 短消息传送过程 ....................................................................................................................... 56

5.1 空闲模式下MS发起的短消息传送 ........................................................................... 56 5.2 空闲模式下MS终止的短消息传送 ........................................................................... 60 5.3 专用模式下MS发起的短消息传送 ........................................................................... 65 5.4 专用模式下MS终止的短消息传送 ........................................................................... 67 6 高级语音呼叫过程 ................................................................................................................... 69

6.1 组呼的信令过程 ........................................................................................................... 69

6.1.1 发起组呼的信令流程 ....................................................................................... 69

6.1.1.1 移动用户发起组呼的信令流程 ........................................................... 69 6.1.1.2 固定用户发起组呼的信令流程 ........................................................... 72 6.1.2 移动用户在主控MSC上申请上行链路的信令流程 ..................................... 74 6.1.3 组呼挂断的信令流程 ....................................................................................... 76

6.1.3.1 主控MSC下的移动用户挂断组呼的信令流程1 .............................. 76 6.1.3.2 中继MSC下的用户挂断组呼的信令流程 ......................................... 77 6.1.3.3 固定用户挂断组呼的信令流程 ........................................................... 78

6.2 语音广播呼叫过程 ....................................................................................................... 79

6.2.1 语音广播呼叫建立信令流程 ........................................................................... 79 6.2.2 语音广播挂断信令流程 ................................................................................... 82

1 基本呼叫过程

1.1 移动用户呼叫移动用户主叫侧完整过程（主叫释放） 1移动用户呼叫移动用户主叫侧完整过程（主叫释放）

MSBTSBSCMSCVLR1 Channel request2 Channel required3 Channel activation4 Channel activation ack5 Immediate assign command6 Immediate assign7 SABM8 Establishment ind(CM service request)9a UA9b CR(CM service request)10 CC11 Map_process_access_request12 Map_authenticate13 Authenticate request14 Data request(authenticate)15 Authenticate request16 Authenticate response17 Data ind(authenticate)18 Authenticate response19 Map_authenticate ack20 Map_set_Ciphering_mode21 Ciphermod cmd22 Encr cmd23 Ciphermod cmd24 Ciphermod com25 Data ind(ciphmod com) 26Ciphrmod com27 Map_process_access_req_ack28 Map_forward _new_TMSI29 TMSI real cmd30 Data request(TMSI real cmd)31 TMSI real cmd32 TMSI real com33 Data ind(TMSI real com)34 TMSI real com35 Map_forward_new_TMSIi ack36 Set_up37 Data ind(set up)38 Set_up39 Map_send_info_for_o/g_call40 Map_complete_call41 Call proceeding42 Data request(call proceeding)43 Call proceeding44 assign request45 Phys CTX request46 Phys CTX conf47a Channel activation48 Channel activation ack49 Data request50 Assign cmd47b Queuing51 Release request