信令网_gsm主叫信令流程图_被叫信令(21)

Layer 3 Downlink 17:59:17.135 CCCHIMMEDIATE ASSIGNMENT

Layer 2 Uplink 17:59:17.348 RACHRANDOM_ACCESS_BURST

Layer 3 Uplink 17:59:17.348 RACHCHANNEL REQUEST

Layer 3 Downlink 17:59:17.469 CCCHIMMEDIATE ASSIGNMENT

Layer 3 Downlink 17:59:17.967 SDCCH

AUTHENTICATION REQUEST

Layer 3 Uplink 17:59:18.706 SDCCHAUTHENTICATION RESPONSE

Layer 3 Downlink 17:59:18.909

SDCCH SETUP

Incoming Call 17:59:18.909

Layer 3 Uplink 17:59:19.177 SDCCH CALL CONFIRMED

Layer 3 Downlink 17:59:19.613 SDCCH

ASSIGNMENT COMMAND

Layer 3 Uplink 17:59:19.836 FACCH ASSIGNMENT COMPLETE

Call Connect Success 17:59:19.836

Layer 3 Uplink 17:59:19.954 FACCH ALERTING

Layer 3 Downlink 17:59:20.002 FACCH PROGRESS

Layer 3 Downlink 17:59:20.120 FACCH ALERTING

Call Connect Success 17:59:20.120

Layer 3 Uplink 17:59:20.144 FACCH CONNECT

Layer 3 Downlink 17:59:20.238 FACCH

CONNECT ACKNOWLEDGE

Call Connect Success 17:59:20.238

Layer 3 Downlink 17:59:20.250 FACCH CONNECT

Layer 3 Uplink 17:59:20.274 FACCH CONNECT ACKNOWLEDGE

Call Connect Success 17:59:20.274

至此,进入通话状态……………

Carrier Interference18:00:30.640

Cellular System: GSM 900

Channel C/I: 3.3

Timeslot C/I: 此时刻,无线链路开始出现恶化C/I=3.3

RX Quality 18:00:00.673

Quality Full: 6

Quality Sub: 7 Quality Sub=7质量恶化

RX Level 18:00:31.133 -87dB 开始恶化

Radio Link Timeout 18:00:31

Radio Link Timeout: 63

RLT开始计数

Frame. Error Rate 18:00:31.133

FER Full: 96 %

FER Sub: 100 %

FER TCH: 100 % FER=100%

被叫释放过程 Layer 3 Downlink 18:00:31.812 FACCH RELEASE

Call Disconnect 18:00:31.812

Layer 3 Downlink 18:00:33.796 SDCCH CHANNEL RELEASE

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