GSM-案例分析
目录
1 接入失败分析............................................................................................................2
1.1 Cause Value:Protocol error，unspecified.......................................................2
1.2 Cause Value:Temporary failure ......................................................................7
1.3 Cause Value:Resources unavailable,unspecified.........................................15
1.4 Cause Value:User busy ................................................................................20
1.5 Cause Value:No user responding .................................................................24
1.6 Cause Value:User alerting, no answer .........................................................29
1.7 Cause Value:Normal call clearing.................................................................34
1.8 Cause Value:Network out off order...............................................................43
1.9 Cause Value: Recovery on timer expiry........................................................49
1.10 Cause Value: SDCCH 掉话.........................................................................51
1.11 Cause Value: 被叫手机入联通网络 ............................................................54
1.12 Cause Value: 被叫手机占用信号语音质量很差 ..........................................56
1.13 Cause Value: Call rejected .........................................................................58
1.14 Cause Value: Switching equipment congestion..........................................61
1.15 Cause Value: IMSI Unknown In VLR ..........................................................62
2 掉话分析 .................................................................................................................64
2.1 因越区覆盖,造成语音质量很差导致掉话........................................................64
2.1 因同邻频干扰造成语音质量很差导致掉话 .....................................................67
2.3 因切换不成功无法返回原信道导致掉话.........................................................69
2.4 因手机掉电或软件原因导致信令流程丢失统计掉话.......................................71
3 切换失败分析 ..........................................................................................................72
3.1Cause Value:干扰 ..........................................................................................72
3.2Cause Value:SUM 板有故障 ..........................................................................73
3.3Cause Value:不符合切换条件（服务质量差） ...............................................74
3.4Cause Value:相同的 BCCH、BSIC 码 ...........................................................76
3.5Cause Value:原小区与周围邻小区切换关系丢失 ...........................................79
4 语音质量问题分析....................................................................................................81
4.1 同邻频干扰造成语音质量差...........................................................................81
4.2 因无线环境差，弱覆盖造成语音质量差.........................................................83
4.3 因硬件问题造成语音质量差...........................................................................83
4.3 因旁瓣信号服务造成语音质量差....................................................................85
5 覆盖问题分析 ..........................................................................................................86
5.1 基站扇区覆盖方向错误 ..................................................................................86
5.2 纬度度问题 ....................................................................................................87
5.3 越区覆盖........................................................................................................88
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