【网友资料大放送】TD-SCDMA切换优化指导书

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1. 概述..........................................................................................................................................6
1.1 文档目的...........................................................................................................................6
1.2 文档读者...........................................................................................................................6
2. TD-SCDMA系统切换原理简介.............................................................................................6
2.1 概述..................................................................................................................................6
2.2 切换流程...........................................................................................................................7
2.2.1 RNC内硬切换...........................................................................................................7
2.2.2 RNC间重定位.........................................................................................................10
2.2.3 RNC内接力切换.....................................................................................................13
3. 切换参数优化.........................................................................................................................16
3.1 概述................................................................................................................................16
3.2 切换测量类参数.............................................................................................................17
3.2.1 事件1G滞后门限...................................................................................................17
3.2.2 事件1G触发时间...................................................................................................17
3.2.3 事件2A滞后门限...................................................................................................18
3.2.4 事件2A触发时间...................................................................................................18
3.2.5 滤波因子.................................................................................................................19
3.2.6 独立测量值偏移.....................................................................................................19
3.3 切换判决类参数.............................................................................................................20
3.3.1 源小区同频切换绝对门限.....................................................................................20
3.3.2 目标小区同频切换绝对门限.................................................................................21
3.3.3 源小区异频切换绝对门限.....................................................................................21
3.3.4 目标小区异频切换绝对门限.................................................................................21
3.4 其它参数：.....................................................................................................................22
4. 切换类KPI............................................................................................................................23
4.1 RNC内硬切换成功率.....................................................................................................23
4.1.1 意义.........................................................................................................................23
4.1.2 定义.........................................................................................................................23
4.1.3 计数器说明（针对UtranCell统计）：...................................................................24
4.2 RNC间重定位成功率：.................................................................................................25
4.2.1 意义：.....................................................................................................................25
4.2.2 定义：.....................................................................................................................25
4.2.3 计数器说明：.........................................................................................................27
4.3 RNC内接力切换成功率.................................................................................................28
4.3.1 意义.........................................................................................................................28
4.3.2 定义.........................................................................................................................28
4.3.3 计数器说明（针对UtranCell统计）：...................................................................28
4.4 系统间CS域切换成功率（TD-SCDMA->GSM）.......................................................29
4.4.1 意义.........................................................................................................................29
4.4.2 定义.........................................................................................................................29
4.4.3 计数器说明.............................................................................................................30
4.5 系统间PS域切换成功率（TD-SCDMA->GPRS，UTRAN发起）............................31
4.5.1 意义.........................................................................................................................31
4.5.2 定义.........................................................................................................................31
4.5.3 计数器说明.............................................................................................................32
4.6 系统间PS域切换成功率（GPRS->TD-SCDMA）......................................................32
4.6.1 意义.........................................................................................................................32
4.6.2 定义.........................................................................................................................32
4.6.3 计数器说明.............................................................................................................33
5. 常见切换问题.........................................................................................................................34
5.1 概述................................................................................................................................34
5.2 漏配邻区.........................................................................................................................35
5.3 导频污染.........................................................................................................................36
5.4 切换参数设置不合理.....................................................................................................37
5.5 上行同步问题导致切换失败.........................................................................................37
5.6 下行干扰导致切换失败.................................................................................................37
5.7 孤岛效应.........................................................................................................................37
5.8 乒乓切换.........................................................................................................................38
5.9 拐角效应.........................................................................................................................38
5.10 硬件故障.....................................................................................................................39
6. 案例........................................................................................................................................39
6.1 漏配邻区.........................................................................................................................39
6.2 切换参数设置.................................................................................................................40