2G部分定时器分析V1.26

GSM定时器和计数器分析

一.

1. 2. 3. 二.

1. 2. 3. 4. 5. 6. 三.

1. 2. 3. 4. 5. 6. 四.

1. 2. 3. 4. 5. 6. 7. 五.

1.

2G定时器现网设置 ............................................................................................................. 4 现状分析 ........................................................................................................................... 4 存在的主要问题 ............................................................................. 错误！未定义书签。 优化建议 ......................................................................................... 错误！未定义书签。 空闲状态定时器分析 ........................................................................................................... 5 PER/T3212 ....................................................................................................................... 5 IMPLTI ............................................................................................................................ 7 AT ..................................................................................................................................... 7 INT ................................................................................................................................... 8 SCOUNT .......................................................................................................................... 9 SINTER ............................................................................................................................ 9 SDCCH信道建立阶段的定时器分析 ................................................................................ 9 RET ................................................................................................................................ 10 T9103 .............................................................................................................................. 11 T3101 .............................................................................................................................. 12 T9105 .............................................................................................................................. 13 T3122 .............................................................................................................................. 14 TCIPH ............................................................................................................................ 15 TCH信道建立阶段定时器分析 ........................................................................................ 15 T9108 .............................................................................................................................. 16 T9103 .............................................................................................................................. 17 T10（BSC） .................................................................................................................. 17 T10（MSC） ................................................................................................................. 18 T11 .................................................................................................................................. 20 T3107 .............................................................................................................................. 20 TREES ........................................................................................................................... 22 TCH信道保持阶段定时器分析 ........................................................................................ 22 T200 ................................................................................................................................ 22

2. 3. 4. 六.

1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 七.

1. 2. 3. 4. 5. 6. 7. 8. 八.

N200 ................................................................................................................................ 23 ARLT .............................................................................................................................. 23 RLT ................................................................................................................................. 24 切换阶段定时器分析 ......................................................................................................... 26 T7 .................................................................................................................................... 26 TQHO ............................................................................................................................. 27 THORE .......................................................................................................................... 28 T9113 .............................................................................................................................. 28 THOCO .......................................................................................................................... 29 T8 .................................................................................................................................... 30 THRHO .......................................................................................................................... 31 T3103 .............................................................................................................................. 32 T3105_D ......................................................................................................................... 33 T3105_F ..................................................................................................................... 34 NY1 ............................................................................................................................. 36

信道释放阶段定时器分析 ................................................................................................. 36 T305 ................................................................................................................................ 36 T308 ................................................................................................................................ 37 T9104 .............................................................................................................................. 38 TCLEA ........................................................................................................................... 39 TCLHO .......................................................................................................................... 40 T3109 .............................................................................................................................. 41 T3111 .............................................................................................................................. 42 T9101 .............................................................................................................................. 43 总结..................................................................................................................................... 44

一. 2G定时器现网设置

1. 现状分析

通过对北京现网42个定时器和计数器的设置分析，北京现网定时器和计数器的设置均比较合理，符合各项功能的原则要求，且全部满足定时器之间的约束关系。

在42个定时器和计数器中，有12个定时器和计数器的设置依据北京现网的情况进行过优化调整，详细信息请见下表：

参数英文名称 PER/T3212 T9105 T10 T3107 T200F T200S N200 T7 T305 T308 T9104 T3109 北京取值 默认值 （诺西） 7.9小时 20s 14s 10s 280ms 280ms 34 30s 10s 5s 15s，20s 15s 0.5 10 8 6 240 260 —— 20 30 30 15 12 BTS BSC BSC BSC BTS BTS BTS BSC MSC MSC BSC BSC Hour S S S ms ms S S S S S 所属网元 单位 上述定时器的调整对于改善掉话率，提高接通率有一定的辅助作用，在一些弱覆盖、快衰落或干扰较高的无线环境内，可以减少掉话，增加客户接入网络的概率，对于客户感知的提高有一定的好处。另一方面，为了保证用户感知，这些TIMER的设置也会增加异常情况下的资源释放时长。

2. 需进一步探讨的内容

考虑到T200和N200参数难以修改，我们以该参数为基础，以参数间的约束为计算规则，综合考虑客户的感知对GSM网络的主要定时器建议如下（其中不需要修改的定时器没