网规网优部寻呼成功率提升工作指导书

wanxiang.li

1     前言----------------------------------------------------------------------------------------------------------- 5
2     寻呼成功率指标定义和分析----------------------------------------------------------------------------- 5
2.1
寻呼成功率指标定义---------------------------------------------------------------------------------- 5
2.2     无线侧寻呼相关计数器及信令统计点--------------------------------------------------------------- 5
2.3     寻呼成功率统计：------------------------------------------------------------------------------------- 7
3     寻呼原理和流程分析-------------------------------------------------------------------------------------- 7
3.1
寻呼原理------------------------------------------------------------------------------------------------ 7
3.2
无线寻呼的基本信令流程----------------------------------------------------------------------------- 8
4     影响寻呼成功率的原因----------------------------------------------------------------------------------- 9
4.1     MSC侧原因---------------------------------------------------------------------------------------------- 9
4.2     BSS侧原因---------------------------------------------------------------------------------------------- 9
4.2.1
PAGING消息在无线信道下发失败------------------------------------------------------------ 9
4.2.2
手机没有收到PAGING消息-------------------------------------------------------------------- 9
4.2.3
手机响应PAGING时，相关信息未能发送到MSC---------------------------------------- 10
5     解决措施---------------------------------------------------------------------------------------------------- 10
5.1     排查流程----------------------------------------------------------------------------------------------- 10
5.2     MSC侧和BSS侧的相关调整内容-------------------------------------------------------------------- 11
5.2.1
首先排除系统导致的异常---------------------------------------------------------------------- 11
5.2.2
检查手机的最新活动状态---------------------------------------------------------------------- 11
5.2.3
排除GPRS的影响------------------------------------------------------------------------------ 12
5.2.4
指标分析----------------------------------------------------------------------------------------- 12
5.2.5
无线参数检查和优化--------------------------------------------------------------------------- 12
5.2.6
MSC寻呼策略的分析-------------------------------------------------------------------------- 15
5.2.7
现场测试----------------------------------------------------------------------------------------- 15
6.       寻呼相关知识------------------------------------------------------------------------------------------- 16
6.1
手机所在寻呼组的计算------------------------------------------------------------------------------- 16
6.2
寻呼组、BS-PA-MFRMS、BS-AG-BLKS-RES（AGB）三者关系------------------------------------ 17
6.3
BTS寻呼容量计算------------------------------------------------------------------------------------ 18
6.4
BTS寻呼负荷计算------------------------------------------------------------------------------------ 20
6.5
寻呼时长计算----------------------------------------------------------------------------------------- 21
6.6
LAC区大小与PCH信道容量的关系--------------------------------------------------------------- 22
6.7
SDCCH信道需求计算------------------------------------------------------------------------------- 23
6.8
ZX-G10 BSC Paging处理能力---------------------------------------------------------------------- 24
6.9
相关参数----------------------------------------------------------------------------------------------- 24
6.9.1
CcchConf 公共控制信道配置----------------------------------------------------------------- 25
6.9.2
BsAgBlkRes 接入准许保留块----------------------------------------------------------------- 26
6.9.3
BsPaMframs
寻呼信道复帧数---------------------------------------------------------------- 27
6.9.4
MaxRetrans
最大重传次数------------------------------------------------------------------- 28
6.9.5
TxInteger
发送分布时隙数（随机等待时间）--------------------------------------------- 28
6.9.6
T3212
周期性位置更新定时器-------------------------------------------------------------- 30
6.9.7
RxLevAccessMin
允许接入的最小接收电平----------------------------------------------- 31
7.       寻呼相关案例------------------------------------------------------------------------------------------- 32
7.1 SDCCH拥塞引起的寻呼无响应------------------------------------------------------------------------- 32
7.2 MSC流控导致的呼不通手机---------------------------------------------------------------------------- 32
7.3 T3212设置错误导致的寻呼无响应-------------------------------------------------------------------- 33
7.4 位置区划分引起寻呼成功率降低---------------------------------------------------------------------- 33
7.5 .MSC寻呼机制导致LAPD寻呼流控----------------------------------------------------------------- 33
7.6 .参数调整提升寻呼成功率----------------------------------------------------------------------------- 35