LTE掉话分析

HUAWEITECHNOLOGIESCO.,LTD.HuaweiConfidentialSecurityLevel:Slidetitle:40-47ptSlidesubtitle:26-30ptColor::whiteCorporateFont:FrutigerNextLTMediumFonttobeusedbycustomersandpartners:Arial:32-35ptColor:R153G0B0CorporateFont:FrutigerNextLTMediumFonttobeusedbycustomersandpartners:ArialSlidetext:20-22ptBulletslevel2-5:18ptColor:BlackCorporateFont:FrutigerNextLTMediumFonttobeusedbycustomersandpartners:ArialToprightcornerforfield-mark,customerorpartnerlogotypes.----------------Thefollowingninegroupsofcolorsareanexampleofhowourdesigncolorscanbeused,pleasetakenotethatyoushouldonlyuseonedesigncolorgroupperslide.Forspecificusagedetails,refertothe“TypesettingStandard”.摘要•本胶片从网络KPI公式定义出发，借助于话统Counter打点机制的介绍，从流程上对掉话率及影响KPI指标的因素进行了进一步的说明；并给出了常见的定位思路及方法，阐述了一线对掉话问题处理的规定动作，在完成规定动作之后仍不能进行问题定位时，需要提交的交付件；•更详细的定位思路讲解和案例请参见附件“LTE掉话问题定位和优化指导书”Page2HUAWEITECHNOLOGIESCO.,LTD.HuaweiConfidentialSlidetitle:32-35ptColor:R153G0B0CorporateFont:FrutigerNextLTMediumFonttobeusedbycustomersandpartners:ArialSlidetext:20-22ptBulletslevel2-5:18ptColor:BlackCorporateFont:FrutigerNextLTMediumFonttobeusedbycustomersandpartners:ArialToprightcornerforfield-mark,customerorpartnerlogotypes.----------------Thefollowingninegroupsofcolorsareanexampleofhowourdesigncolorscanbeused,pleasetakenotethatyoushouldonlyuseonedesigncolorgroupperslide.Forspecificusagedetails,refertothe“TypesettingStandard”.目录•掉话率公式定义•掉话问题的常见表现HUAWEITECHNOLOGIESCO.,LTD.HuaweiConfidentialSlidetitle:32-35ptColor:R153G0B0CorporateFont:FrutigerNextLTMediumFonttobeusedbycustomersandpartners:ArialSlidetext:20-22ptBulletslevel2-5:18ptColor:BlackCorporateFont:FrutigerNextLTMediumFonttobeusedbycustomersandpartners:ArialToprightcornerforfield-mark,customerorpartnerlogotypes.----------------Thefollowingninegroupsofcolorsareanexampleofhowourdesigncolorscanbeused,pleasetakenotethatyoushouldonlyuseonedesigncolorgroupperslide.Forspecificusagedetails,refertothe“TypesettingStandard”.完整的呼叫流程如果是eNB发起的释放流程，则在S1口包含3条释放信令（如左下图绿色区域内所示），按照先后顺序分别为：UE_Context_Rel_ReqUE_Context_Rel_CmdUE_Context_Rel_Cmp如果是MME发起的释放流程，则在S1口包含2条释放信令（如右下图绿色区域内所示），按照先后顺序分别为：UE_Context_Rel_CmdUE_Context_Rel_CmpPage4eNB主动发起的正常释放流程由于UENAS层触发的核心网主动发起的释放HUAWEITECHNOLOGIESCO.,LTD.HuaweiConfidentialSlidetitle:32-35ptColor:R153G0B0CorporateFont:FrutigerNextLTMediumFonttobeusedbycustomersandpartners:ArialSlidetext:20-22ptBulletslevel2-5:18ptColor:BlackCorporateFont:FrutigerNextLTMediumFonttobeusedbycustomersandpartners:ArialToprightcornerforfield-mark,customerorpartnerlogotypes.----------------Thefollowingninegroupsofcolorsareanexampleofhowourdesigncolorscanbeused,pleasetakenotethatyoushouldonlyuseonedesigncolorgroupperslide.Forspecificusagedetails,refertothe“TypesettingStandard”.触发掉话的机制•协议对于正常释放的定义当eRAB或UE上下文释放原因值为“NormalRelease”、“Userinactivity”或者是由于成功进行移动性活动的原因值，则判定为正常释放•触发异常释放的机制空口RRC/NASAM模式信令交互失败；空口重同步失败；空口RLC达到最大重传次数；（包括上行/下行，SRB/DRB）eNB/MME侧资源拥塞；传输故障；eNB/MME内部异常；Page5HUAWEITECHNOLOGIESCO.,LTD.HuaweiConfidentialSlidetitle:32-35ptColor:R153G0B0CorporateFont:FrutigerNextLTMediumFonttobeusedbycustomersandpartners:ArialSlidetext:20-22ptBulletslevel2-5:18ptColor:BlackCorporateFont:FrutigerNextLTMediumFonttobeusedbycustomersandpartners:ArialToprightcornerforfield-mark,customerorpartnerlogotypes.----------------Thefollowingninegroupsofcolorsareanexampleofhowourdesigncolorscanbeused,pleasetakenotethatyoushouldonlyuseonedesigncolorgroupperslide.Forspecificusagedetails,refertothe“TypesettingStandard”.终端侧掉话公式定义（1/3）•终端侧CallDropRate=eRABAbnormRel/eRABSetupSuccess*100%eRABAbnormRel：eRAB异常释放事件次数eRABSetupSuccess：eRAB建立成功事件次数Page6HUAWEITECHNOLOGIESCO.,LTD.HuaweiConfidentialSlidetitle:32-35ptColor:R153G0B0CorporateFont:FrutigerNextLTMediumFonttobeusedbycustomersandpartners:ArialSlidetext:20-22ptBulletslevel2-5:18ptColor:BlackCorporateFont:FrutigerNextLTMediumFonttobeusedbycustomersandpartners:ArialToprightcornerforfield-mark,customerorpartnerlogotypes.----------------Thefollowingninegroupsofcolorsareanexampleofhowourdesigncolorscanbeused,pleasetakenotethatyoushouldonlyuseonedesigncolorgroupperslide.Forspecificusagedetails,refertothe“TypesettingStandard”.终端侧掉话公式定义（2/3）•华为GenexPA软件定义一、终端没有收到MME发送的“DEACTIVATEEPSBEARERCONTEXTREQUEST”的NAS消息，终端也没有向网络侧主动发出“DETACHREQUEST”的NAS消息，但收到了eNodeB下发的RRCConnectionReconfiguration消息，且其中有信元“drb-ToReleaseList”，则生成一次ERABAbnormalRel事件。记录ReleaseList下的eps-BearerIdentity个数。如果ERABnum减完eps-BearerIdentity个数以后是0，则状态迁移到RRC_Idle，否则状态不迁移。二、或者终端在没有收到MME发送的“DEACTIVATEEPSBEARERCONTEXTREQUEST”的NAS消息，终端也没有向网络侧主动发出“DETACHREQUEST”的NAS消息，却收到了eNodeB下发的RRCConnectionrelease消息并且前4s如果有RLC层速率传输(上下行都需要考虑进来的，任何一个方向只要有数传即满足条件)，生成一次ERABAbnormalRel，状态迁移到RRC_idle。Page7HUAWEITECHNOLOGIESCO.,LTD.HuaweiConfidentialSlidetitle:32-35ptColor:R153G0B0CorporateFont:FrutigerNextLTMediumFonttobeusedbycustomersandpartners:ArialSlidetext:20-22ptBulletslevel2-5:18ptColor:BlackCorporateFont:FrutigerNextLTMediumFonttobeusedbycustomersandpartners:ArialToprightcornerforfield-mark,custom