第1页共38页编号：时间：2021年x月x日书山有路勤为径，学海无涯苦作舟页码：第1页共38页中国移动网络优化技术培训班课程目录1掉话分析..................................................................................................................................31.1GSM系统掉话案例分析.........................................................................................31.1.1掉话的形式.......................................................................................................31.1.2无线掉话的原因...............................................................................................31.1.3掉话处理流程...................................................................................................31.1.4掉话分析...........................................................................................................42分配失败率..............................................................................................................................92.1指配的基本信令流程...............................................................................................92.2指配过程常见问题...................................................................................................93SDCCH、TCH拥塞分析......................................................................................................103.1SDCCH拥塞..........................................................................................................103.2TCH拥塞................................................................................................................113.3SDCCH信道拥塞..................................................................................................123.3.1硬件故障.........................................................................................................123.3.2频繁位置更新.................................................................................................133.3.3由于话务量较高导致SDCCH拥塞..............................................................133.3.4邻小区故障导致SDCCH拥塞......................................................................133.4TCH信道拥塞........................................................................................................133.4.1硬件、传输故障.............................................................................................143.4.2高话务小区TCH拥塞...................................................................................143.4.3频繁切换导致TCH拥塞...............................................................................144RACH接入的有效性.............................................................................................................144.1什么是RACH接入有效........................................................................................144.2影响有效RACH接入的因素----“信道请求消息”碰撞................................154.3RACH接入常见的问题.........................................................................................164.3.1解码的RACH请求数很少............................................................................164.3.2在高电平下，仍无法解调出正确的信号（即解调出的信息编码错误）..174.3.3LAPDm建立成功率低..................................................................................174.4故障处理流程...............................
