文档介绍：“无线网络优化经验研究”之《路测切换失败的原因分析及解决》目录第一章前言...........................................................................................................2第二章切换流程分析...........................................................................................5一、小区内部切换(INTRA_CELLHANDOVER)..........................................5二、BSC内部小区间切换(INTRA_BSCHANDOVER)...................................6三、MSC内部BSC间切换(INTRAMSCHANDOVER)...................................8四、MSC间切换...........................................................................................11第三章切换失败的原因分析.............................................................................13一、连续的切换失败....................................................................................13实例1731医院的时钟失锁...............................................................14实例2化工研究院时钟失锁..............................................................17实例3沙沟DCS与东铁家坟DCS的同频同BSIC.............................18注:LAPD和LAPDm中使用的帧类型以及它们的结构........................20二、单独出现的切换失败............................................................................221)连续多个下行PhysicalInformation,超过系统设置造成失败.................................................................................................................22实例:马家堡DCS1.........................................................................222)无下行physicalinformation......................................................:设置小区同步切换对切换流程的影响.................................................253)plete后手机再上行发送HO_Failure消息.............................................................................................................264)其它可能出现的切换失败现象.......................................................,Cause:“handoverimpossible,timingadvanceoutofrange”........................:“frequencynotimplemented”............................:“eptable”.................................