基于SEQ信令平台的esrvcc切换优化指导手册

基于信令平台的eSRVCC切换优化指导手册一、基于SEQ信令平台的eSRVCC使用方法及步骤1、进入SEQ平台，选择HOME下多维数据分析2、选择srvcc切换模板3、选择过滤条件，通常选择省、市等，也可根据需求选择其他字段4、选择时间粒度后，点击查询5、查询结果出来后，点击次数，蓝色具体失败次数才会呈现；MSC列为省内2个EMSC，目前江苏有2个EMSC.双击蓝色失败次数，可以看到每次失败的详细清单，时间、原因，源小区、目标小区等；6、看到详细失败清单，可以点击右上角的输出键，选择输出到表格中，也可点击每条记录查看详细信令流程。6.1点击记录显示失败流程，点击每条流程显示详细解码等；6.2对于小于10000次的记录，直接输出即可；对于大于10000次的记录，提示异步导出任务管理；随后到日志管理菜单下—异步导出任务管理中，查看刚刚输出任务是否在执行或完成等；7、输出表格主要分析内容MSC:即EMSC名称；MME名称，源小区，2G目标小区，SM失败原因；二、相关知识了解1、4G小区的ECGI与GSM的CGI的组成GSM中CGI=MCC+MNC+LAC+CID而LTE中ECGI=MCC+MNC+ECI(ENODEBID+Localcellid)eCI在3GPP协议中规定为7个16进制的编码。其中，前面的5个16进制为eNodeBid，后2个16进制为Localcellid。通常大家会误解，而实际在报文中，这个序列是一个串联的28个bit构成。总的来说就是eNodeBid和Localcellid组成ECGI全称（演进型-通用移动通信系统陆地无线接入网小区全局标识符）。CGISAI小区4G小区SM原因切换的目标小区LF520B0ALF520B0A46000530B001LF520B0A46000530B0011Unspecified4600050865DADLF520B0ALF520B0A46000530B001LF520B0A46000530B0011Unspecified4600050865DADLF531L5CLF531L5C46000DACA603LF531L5C46000DACA6034600051EECF27LF531L5CLF531L5C46000DACA603LF531L5C46000DACA6034600051EECF27LF520B0ALF520B0A46000530B001LF520B0A46000530B0011Unspecified4600050865DADLF520B0ALF520B0A46000530B001LF520B0A46000530B0011Unspecified4600050865DADLF520B0ALF520B0A46000530B001LF520B0A46000530B0011Unspecified460005086663BLF520B0ALF520B0A46000530B001LF520B0A46000530B0011Unspecified460005086663BLF520B0ALF520B0A46000530B001LF520B0A46000530B0011Unspecified4600050865DAFLF520B0ALF520B0A46000530B001LF520B0A46000530B0011Unspecified4600050865DAFLF520B0ALF520B0A46000530B001LF520B0A46000530B0011Unspecified4600050865DAFLF520B0ALF520B0A46000530B001LF520B0A46000530B0011Unspecified460005086663BLF520B0ALF520B0A46000530B001LF520B0A46000530B0011Unspecified460005086663BLF520B0ALF520B0A46000530B001LF520B0A46000530B0011Unspecified460005086663B1.1GSM小区样例解析GSM目标小区：4600050865DAD，其中46000为MCC+MNC；5086为LAC的十六进制，5DAD为cellid的十六进制；可以根据需要将LAC,CELLID转化为十进制查询小区中文名；1.2LTE小区样例解析LF520B0A46000530B001LF:L是LTE小区，F是频段；520B0是ENODEBID；A是扇区区分；LF520B0是enodeb名称，LF520B0A是小区名；46000530B001是4G小区的ECGI，由MCC+MNC+ECI(ENODEBID+LOCALCELLID)46000是MCC+MNC；530B001是ECI，ENODEBID+LOCALCELLID组成；530B0是ENODEBID，换算成十进制就是340144，01是localcellid；2、省内SBC的STN-SR及信令流程中STN-SR解析2.1、STN-SR含义STN-SR：SessionTransferNumberforSRVCC，STN-SR是SRVCC用户到SCCAS的路由号码。STN-SR静态配置在SCCAS和HSS上，基于运营商策略，可以给所有的UE都配一个相同的STN-SR，或不同的STN-SR，可以看成是签约时就配好的静态数据。E-STN-SR：EmergencySessionTransferNumberforSRVCC，紧急呼叫的会话切换号码。和STN-SR不一样，E-STN-SR是直接配置在EATF和eMSC上的。2、省内SBC对应SNT-SR和覆盖地市情况SBC名称STN-SR信令中STN-SR覆盖地市NJATCF10BHW86134443066831443460南京、扬州、泰州、盐城、宿迁、淮安、连云港、徐州NJATCF11BHW86134443076831443470南京、扬州、泰州、盐城、宿迁、淮安、连云港、徐州WUXATCF1BHW86134443086831443480无锡、常州、镇江、南通WUXATCF2BHW86134443096831443490无锡、常州、镇江、南通SUZATCF1BHW86134443126831443421苏州SUZATCF2BHW86134443136831443431苏州3、SEQ信令流程中SNT-SR格式及换算方法可以看出STN-SR格式为916831471037，916831443460，916831443470等；如何比对？91不用看，其他每2位倒叙就行了。如STN-SR:916831443460，91不管，其他每2位倒叙为86，13，44，43，06，对应SBC为NJATCF10BHWMME向UE_A当前所在地区的eMSC发起eSRVCC切换请求，请求中携带信元IMSI、STN-SR、C-MSISDN等。4、eSRVCC信令流程UESourceE-UTRANSourceMMEMSCServer/MGWTargetMSC14.HandoverCommandTargetBSS1.Measurementreports3.HandoverRequiredS-GW/PDNGW2.DecisionforHO5.PStoCSReq6.PrepHOReq7.HORequest/Ack8.PrepHOResp9.Establishcircuit19.HOComplete20.SES(HOComplete)21.ANSWER13.PStoCSResp15.HOfromEUTRANcommandHSS/HLR23b.UpdateLoc10.InitiationofSessionTransfer(STN-SRorE-STN-SR)11.SessiontransferandUpdateremoteendIMS12.ReleaseofIMSaccessleg22.PStoCSComplete/AckTargetSGSN16.UEtunestoGERAN17.HODetection18.Suspend(seeTS23.060)18.Suspend18.SuspendRequest/Response22a.Bearerhandlingandsuspension4.BearerSplittingGMLC24.SubscriberLocationReport23a.TMSIReallocation4.1、handoverrequired内容UE_A测量到邻区的3G网络信号强度满足门限后，向eNodeB_A上报系统测量报告，eNodeB_A经过判断决定切换后，向MME_A发送切换请求handoverrequired消息。消息中携带的关键信元如下图所示。4.2、PStoCSRequest消息内容MME_A向UE_A当前所在小区的SRVCCIWF发起eSRVCC切换请求PStoCSRequest消息。消息中携带的关键信元如图所示。三、常见esrvcc失败原因分析及解决措施1、全省esrvcc失败原因分析（1周汇总）项目失败次数失败占比1Unspecified5732837.75%1000Timeout2782218.32%2Handover/Relocationcancelledbysourcesystem4787231.52%3Handover/RelocationFailurewithTargetsystem19581.29%6TargetCellnotavailable490.03%7NoRadioResourcesAvailableinTargetCell17281.14%73Noresourcesavailable2730.18%8FailureinRadioInterfaceProcedure16531.09%未解析原因131868.68%汇总151869100.00%备注、地市公司各类失败原因占比地市1Unspecified1000Timeout2Handover/Relocationcancelledbysourcesystem3Handover/RelocationFailurewithTargetsystem6TargetCellnotavailable7NoRadioResourcesAvailableinTargetCell73Noresourcesavailable8FailureinRadioInterfaceProcedure未解析原因总计常州3.83%2.19%3.67%0.00%0.00%0.08%0.00%0.00%0.99%10.75%淮安0.14%0.20%1.05%0.03%0.00%0.02%0.00%0.00%1.28%2.72%连云港0.26%0.49%0.59%0.01%0.00%0.02%0.00%0.24%0.06%1.67%南京0.61%3.00%7.19%0.37%0.03%0.09%0.03%0.00%0.63%11.94%南通3.72%1.68%2.32%0.02%0.00%0.08%0.00%0.00%0.69%8.51%苏州25.39%4.52%6.55%0.02%0.00%0.11%0.01%0.00%1.31%37.91%泰州0.29%0.93%1.09%0.14%0.00%0.06%0.00%0.00%1.16%3.67%无锡2.22%2.41%3.46%0.01%0.00%0.12%0.05%0.00%0.45%8.72%宿迁0.00%0.01%0.01%0.00%0.00%0.00%0.00%0.00%0.03%0.05%徐州0.50%0.83%1.27%0.03%0.00%0.01%0.00%0.85%0.11%3.60%盐城0.29%0.76%1.74%0.26%0.00%0.12%0.00%0.00%0.78%3.96%扬州0.25%0.64%1.05%0.15%0.00%0.01%0.00%0.00%1.0