LTE掉话优化通用指南

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”.目录•掉话率公式定义•掉话问题的常见表现•掉话问题范围确定及规定动作执行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_CmpPage3eNB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；Page4HUAWEITECHNOLOGIESCO.,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•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Page5HUAWEITECHNOLOGIESCO.,LTD.HuaweiConfidentialSlidetitle:32-35ptColor:R153G0B0CorporateFont:FrutigerNextLTMediumFonttobeusedbycustomersandpartners:ArialSlidetext:20-22ptBulletslevel2-5:18ptColor:BlackCorporateFont:FrutigerNextLTMediumFonttobeusedbycustomersandpartners:ArialToprightcornerforfield-mark,customerorpartnerlogotypes.----------------Thefollowingninegroupsofcolorsareanexampleofhowourdesigncolorscanbeused,pleasetakenotethatyoushouldonlyuseonedesigncolorgroupperslide.Forspecificusagedetails,refertothe“TypesettingStandard”.网络侧掉话公式定义•网络侧CallDropRate=L.E-RAB.AbnormRel/（L.E-RAB.NormRel+L.E-RAB.AbnormRel）*100%L.E-RAB.AbnormRel：小区异常释放用户E-RAB的总次数L.E-RAB.NormRel：小区正常释放用户E-RAB的总次数Page6HUAWEITECHNOLOGIESCO.,LTD.HuaweiConfidentialSlidetitle:32-35ptColor:R153G0B0CorporateFont:FrutigerNextLTMediumFonttobeusedbycustomersandpartners:ArialSlidetext:20-22ptBulletslevel2-5:18ptColor:BlackCorporateFont:FrutigerNextLTMediumFonttobeusedbycustomersandpartners:ArialToprightcornerforfield-mark,customerorpartnerlogotypes.----------------Thefollowingninegroupsofcolorsareanexampleofhowourdesigncolorscanbeused,pleasetakenotethatyoushouldonlyuseonedesigncolorgroupperslide.Forspecificusagedetails,refertothe“TypesettingStandard”.网络侧异常释放Counter打点•如图1中A点所示，当eNodeB发出E-RABRELEASEINDICATION消息，且释放原因不为“NormalRelease”，“UserInactivity”，“CSfallbacktriggered”，“Inter-RATredirection”时统计该指标。如果E-RABRELEASEINDICATION信令中要求同时释放多个E-RAB，则相应的指标统计多次；•如图2中A点所示，当eNodeB向MME发送UECONTEXTRELEASEREQUEST消息，会释放UE的所有E-RAB。当释放原因不为“NormalRelease”，“UserInactivity”，“CSfallbacktriggered”，“Inter-RATredirection”时，相应的指标累加统计。Page7注：eRABRelease流程是需要释放一条或多条eRAB连接，在流程完成之后至少还剩余1条默认承载继续保持着；UEContextRelease流程是需要释放所有连接，在完成该流程之后，不再存在任何承载（连默认承载都需要释放）HUAWEITECHNOLOGIESCO.,LTD.HuaweiConfidentialSlidetitle:32-35ptColor:R153G0B0CorporateFont:FrutigerNextLTMediumFonttobeusedbycustomersandpartners:ArialSlidetext:20-22ptBulletslevel2-5:18ptColor:BlackCorporateFont:FrutigerNextLTMediumFonttobeusedbycustomersandpartners:ArialToprightcornerforfield-mark,customerorpartnerlogotypes.----------------The