爱立信GPRS优化分册——GPRS网络评估及优化方案

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爱立信GPRS 网络评估及优化方案

1 引言.......................................................................................................................................................................4
1.1 GPRS网络优化的引入.....................................................................................................................................4
1.2 GPRS核心网络优化主要内容..........................................................................................................................4
1.3 GPRS无线网络优化主要内容..........................................................................................................................4
1.4 GPRS网络优化方法.........................................................................................................................................5
2 爱GPRS立信重要性能指标.................................................................................................................................7
2.1 GPRS核心网络重要性能指标..........................................................................................................................7
2.1.1 平均附着用户数......................................................................................................................................7
2.1.2 GPRS附着成功率....................................................................................................................................7
2.1.3 SGSN内路由区更新成功率......................................................................................................................9
2.1.4 SGSN间路由区更新成功率....................................................................................................................10
2.1.5 路由区更新成功率................................................................................................................................12
2.1.6 PDP激活的上下文激活用户数..............................................................................................................13
2.1.7 PDP上下文激活成功率.........................................................................................................................13
2.1.8 分组寻呼成功率....................................................................................................................................15
2.1.9 SGSN Gb 上行流量................................................................................................................................17
2.1.10 SGSN Gb 下行流量............................................................................................................................17
2.1.11 GGSN Gi 上行流量............................................................................................................................18
2.1.12 GGSN Gi 下行流量............................................................................................................................18
2.2 GPRS无线网络重要性能指标........................................................................................................................18
2.2.1 分组业务随机接入................................................................................................................................18
2.2.2 PDCH分配尝试次数..............................................................................................................................19
2.2.3 PDCH分配失败率.................................................................................................................................19
2.2.4 PCUPDCH引起的分配失败次数...........................................................................................................19
2.2.5 PDCH预清空次数.................................................................................................................................19
2.2.6 PDCH小区中平均分配个数..................................................................................................................20
2.2.7 PDCH(ALLPDCHACTACC)小区中平均激活个数...............................................................................20
2.2.8 PDCH激活个数峰值..............................................................................................................................20
2.2.9 RLC层下行数据包重传率......................................................................................................................20
2.2.10 RLC层上行数据包重传率..................................................................................................................21
2.2.11 PCU丢弃的下行帧帧数.....................................................................................................................21
2.2.12 PCU丢弃的上行帧帧数.....................................................................................................................21
2.2.13 分组寻呼次数....................................................................................................................................22
3 GPRS爱立信网络参数调整................................................................................................................................23
3.1 NS控制层........................................................................................................................................................23
3.1.1 NSVC Block/UnBlock周期......................................................................................................................23
3.1.2 NSVC复位周期定时器...........................................................................................................................23
3.1.3 NSVC复位过程定时器...........................................................................................................................23
3.1.4 NSVC测试定时器..................................................................................................................................23
3.1.5 FrameRelay数据包通过网的时间..........................................................................................................24
3.1.6 NS控制层参数列表................................................................................................................................24
3.2 BSSGP 层........................................................................................................................................................24
3.2.1 流量控制消息定时器.............................................................................................................................24
3.2.2 BVC复位控制定时器..............................................................................................................................25
3.2.3 BVC复位定时器.....................................................................................................................................25
3.2.4 BSSGP层参数列表................................................................................................................................26
3.3 SNDCP层........................................................................................................................................................26
3.3.1 延迟级别权重........................................................................................................................................26
3.3.2 吞吐量级别权重....................................................................................................................................26
3.3.3 1234PDU延时级别为，，，的保持时间.............................................................................................27
3.3.4 PDP上下文包队列长度.........................................................................................................................27
3.3.5 SNDCP层参数列表................................................................................................................................28
3.4 GMM层...........................................................................................................................................................28
3.4.1 移动可达定时器....................................................................................................................................28
3.4.2 READY定时器........................................................................................................................................29
3.4.3 SNDCP层参数列表................................................................................................................................29
3.5 计费.................................................................................................................................................................29
3.5.1 PDP上下文数据阈值.............................................................................................................................29
3.5.2 CDR产生时间........................................................................................................................................30
3.5.3 CDR缓冲输出时间................................................................................................................................30
3.5.4 计费参数列表........................................................................................................................................30
3.6 GN接口参数....................................................................................................................................................31
3.6.1 GTP建立请求响应时间..........................................................................................................................31
3.6.2 GTP建立请求次数.................................................................................................................................31
3.6.3 GTP更新请求响应时间..........................................................................................................................31
3.6.4 GTP更新请求次数.................................................................................................................................32
3.6.5 GTP删除响应时间.................................................................................................................................32
3.6.6 GTP删除请求次数.................................................................................................................................32
3.6.7 GTP识别响应时间.................................................................................................................................32
3.6.8 GTP识别请求次数.................................................................................................................................33
3.6.9 SGSN上下文请求响应时间....................................................................................................................33
3.6.10 SGSN上下文请求次数.......................................................................................................................33
3.6.11 Gn接口参数列表................................................................................................................................33
3.7 无线部分参数.................................................................................................................................................34
3.7.1 网络运行模式........................................................................................................................................34
3.7.2 GPH动态设备保留数.............................................................................................................................34
3.7.3 GPRS优先级..........................................................................................................................................35
3.7.4 PDCH空闲时钟.....................................................................................................................................35
3.7.5 编码方式................................................................................................................................................35
3.7.6 TBF下行共享限制.................................................................................................................................35
3.7.7 TBF上行共享限制.................................................................................................................................36
3.7.8 MS功率减少等级...................................................................................................................................36
3.7.9 BTS预期接收信号强度...........................................................................................................................36
3.7.10 PDCH专有数量.................................................................................................................................37
3.7.11 PDCHALLOC....................................................................................................................................37
3.7.12 无线部分参数列表.............................................................................................................................37
4 常见问题分析.....................................................................................................................................................38
4.1 GPRS附着失败...............................................................................................................................................38
4.1.1 GPRS附着请求被拒绝的原因................................................................................................................38
4.1.2 MSGPRS在侧造成附着失败的情况......................................................................................................38
4.1.3 GPRS在网络侧造成附着失败情况........................................................................................................39
4.1.4 GPRS解决附着失败的方法....................................................................................................................40
4.2 PDP上下文激活失败......................................................................................................................................40
4.2.1 MSPDP发起的上下文激活失败的原因................................................................................................40
4.2.2 PDP网络发起上下文去激活的原因......................................................................................................40
4.2.3 PDP常见的上下文激活失败原因..........................................................................................................41
4.2.4 PDP解决上下文激活失败问题的建议..................................................................................................41
4.3 无线部分.........................................................................................................................................................41
4.3.1 PING丢包率较高...................................................................................................................................41
4.3.2 RLC层速率低.........................................................................................................................................41
Figure 1， 网络优化服务流程 6
Figure 2， 平均附着用户数 7
Figure 3， 附着尝试次数 8
Figure 4， 附着失败次数 9
Figure 5， SGSN内路由区更新尝试次数 9
Figure 6， SGSN内路由区更新失败次数 10
Figure 7， SGSN间路由区更新尝试次数 11
Figure 8， SGSN间路由区更新失败次数 12
Figure 9， PDP上下文激活成功次数 14
Figure 10， PDP上下文激活失败次数 15
Figure 11，分组交换寻呼程序的尝试次数 16
Figure 12，分组交换寻呼程序的成功次数 17

[ 本帖最后由 tomtuo 于 2010-10-15 08:35 编辑 ]