信令网_gsm主叫信令流程图_被叫信令(20)

Layer 3 Downlink SDCCH ASSIGNMENT COMMAND 业务信道分配

Layer 3 Uplink FACCH ASSIGNMENT COMPLETE 业务信道分配完成

Call Connect Success 呼叫成功,表示主叫接入网络

立即指配 Layer 3 Downlink CCCH IMMEDIATE ASSIGNMENT

Layer 2 Uplink RACH RANDOM_ACCESS_BURST

信道请求

原因:用于响应呼叫 Layer 3 Uplink RACH CHANNEL REQUEST

立即指配 Layer 3 Downlink CCCH IMMEDIATE ASSIGNMENT

Layer 3 Downlink SDCCH AUTHENTICATION REQUEST

Layer 3 Uplink SDCCH AUTHENTICATION RESPONSE

Layer 3 Downlink SDCCH IDENTITY REQUEST

Layer 3 Uplink SDCCH IDENTITY RESPONSE

Layer 3 Downlink SDCCH AUTHENTICATION REJECT

Layer 3 Downlink FACCH DISCONNECT

Call Disconnect 含有拆线原因

Layer 3 Downlink SDCCH CHANNEL RELEASE

Layer 3 Downlink FACCH RELEASE COMPLETE 释放完成

Layer 3 Downlink FACCH CHANNEL RELEASE 信道释放

Layer 2 Uplink FACCH DISC-CMD 回到空闲模式

§3.5无线链路超时造成掉话信令流程

主叫 被叫

Call Attempt 17:59:12.061

Layer 2 Uplink 17:59:12.625 RACHRANDOM_ACCESS_BURST

Layer 3 Uplink 17:59:12.625 RACH CHANNEL REQUEST

Layer 3 Downlink 17:59:12.710 CCCHIMMEDIATE ASSIGNMENT

Layer 3 Uplink 17:59:12.895 SDCCH CM SERVICE REQUEST

Layer 3 Downlink 17:59:13.332 SDCCHAUTHENTICATION REQUEST

Layer 3 Uplink 17:59:14.074 SDCCHAUTHENTICATION RESPONSE

Layer 3 Downlink 17:52:14.275 SDCCH CM SERVICE ACCEPT

Layer 3 Uplink 17:52:14.780 SDCCH SETUP

Layer 3 Downlink 17:52:14.981 SDCCH CALL PROCEEDING

Layer 3 Downlink 17:52:15.450 SDCCHASSIGNMENT COMMAND

Layer 3 Uplink 17:52:15.637 FACCH ASSIGNMENT COMPLETE

Call Connect Success 17:59:15.637

Frequency Hopping Status 17:59:15.637

Layer 3 Downlink17:59:16.996 CCCHIMMEDIATE ASSIGNMENT

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