AMF与MME地址对接问题导致5-4切换不成功优化案例.docx

AMF与MME地址对接问题导致5-4切换不成功1.问题描述跑圈测试中发现SA网络频繁上报异系统Bl,切换LTE失败，原因切换准备失败，原因值为：unknowTargetid(12),导致拉网sa-lte场景无法搭建，协同爱立信MME和5GC抓包定位。2 .问题分析2.1. 问题现象在某地进行组合52遍历测试过程当中发现，测试终端占用SA网络，一直上报Bl,核心网返回切换准备失败，失败原因：unknowntargetlD(12),导致大概率5-4的切换失败。2.2. 问题分析1、查询站点无告警，测试期间，基站侧无操作，无线环境良好;2、终端在SA网络，从15:02:54开始，一直上报Bl事件，目标小区PCI:183/54,系统没有任何响应，如下:加0881皿%1 O UOG8 1MV, I 1 1S34 1MO"" ISXASsJ 1 M0C8 1MU5,. 1 WOWR WS” ? MM4B46 1Sl1MSA i RV03B13Y J MX>8e3S40 i &M8.1 WX0 Jn<3 I 1 MM<elSWS*3 4 MO813S4 4 MW81W WClSCiSa SM04T4、MO881,8V0 VAMD881A3MEWO4WIMtMIOtV03SIMVWg>*KHPCIW.¼rKMm*P9.5mCHmK)15f*<4<VNklIMCHKtMKMMiMCH*(lM7>rKrtRUPnSmUMSMiH>vw<WM>)M4eKtMSe*K.WnCfmtiarwrKHmaF.11<4MMq>OT(«nm4Mc三ttAMM<R<fW<tW75efKHRBPQIVrvCHmM)H5ew(««WMt½M«*CtMMMMterKHTWrWKMMrVktenOMSlKXtIAovwCMWMtUMfUt4MMUWrKHTOS>rMHWUPWnm(fMUK*”rCVrMUJM<«eKZVMX“<QCtWWrKtsaPSWOMWK)IISevvCfftmHMMKiISlIMiMeWrCentJBAWrKHMt>.三vUMtMIQ11>v(<M<>lMo*<¼SlMNUWrHTil*T.rKMRUFt.VrvCHmK)IlvVVoMtRCMFIBHBVNCrjCNKueRSM>9gtsIlXWcEm，ZwaS<s2jmhc-Wr<HfttiBZAmce>,m<tfMUQ.1>r<«MNMJMOIaAtMUWnCHrCtIarV«HRMr9t.5m(HmIQH5m(WN0tI?KMT4mtM3CMW*KHKIM7.f*KKRMFafKHMM>ISmOMNkQMrtKI1S11MJe.jt*ruSerKtWrnWrVC*twmcWMtM"U乂比W<<m>»?5«<<HKVap9t.ffKHmHQt15v<44WMtMM<HKtl4KM期间低概率性与PCI：183切换成功，如下:SUOMolISfiUOMDateTrawtarMt»TPMHMU334S<rWMtH>9HgJMMKCMton«%fHFOIW&MOItSC&P100MtfEUItlmyMrQMMAQ15mMU303S门必"111NRhwaAIMMtUft-NnmhOtfRyrem*UUnek>n99ffWyBWolftJ-1a-11MMfmmaiq11URS<m>ylfm1.t*np1ofnQge11MU0W04M¼StS)MttWV«11n(Ht*nG4kW*Mn(HlMQm4«$MMK*tMKMWOggISOSitMUtrfHOAnMl(ItTe9MfQian,MKM!MOO/IMfM0OMO2IofNWO4»OHS0Su|mEmlCMftQWteMMelISAMbMut11H0，2020-08-08 15:06:18.2020-08-08 15:06:19.2020-08-08 15:06:19.2020-08-08 15:06:19.7413860INKcveniDIVIeaSLon. di-irNREventBI NR2LTEH0Attempt LTEniBConfigSerVCelIPQ:387;falseirgetEARFCN:38400;t304:ms500;HOTypeng<-ToEPC2020-08-0815:0620.019LTERandomAccess2020-08-0815:0620.090LTETAUpdateAttempt3、分析UU口跟踪信令发现：终端发上报的BI测量报告系统均有正常收到，现象同前台一致。MjNHISJCtintI M JOHP 2f M N al N>KXXX矢M 圳 S3MUSJ10MgHwm< 丽"IWWMlMttJlWn>KHMHai KMMiHsmpmMUIH<U)i-*4srweawcMnx'nrct*nHfaaautt 5e <IPOIMi0XM4RB<TISa61¾f<<MltKCWMFrWCf<ttl>lg¾flyMyy 而KHHOMnnMd KMMX2r*t3f .QLc.mwt 3K Elyk _ 中.9>：."'cj±jgL-.E* ，k .Ogr KaK 一 故.3. 反.5Ew -严.3K f4.2JMJWT 一 CK 一IKMMB MutgnnWHlMgnoni >SSMn ：；段“，工郭e gy<¾ WMHl HWMtT SSS2ioi »3MMaXWWMj*ao.8”.*e.I aw 一R IMQeraMHWHWWNIHiKHWHWHWKWK ' ' '记 tzn4acCXeIn9«9:i”iu，iia9ixiq3aM2,i«xx14、分析NG口信令发现：基站已经向AMF发起了HANDOVERREQU1ER,接着AMF向基站下发了HO-PREP-FAIL,原因值UnknoWntagetlD(12),切换失败，如下:一 E厚磨逑厚河*se)石片湍/W二二三三二二三 oc rM cfNMaM w* a9WMMj*rn fMMNMl*MMMiPXtMMHMNNKV*C>M<f X鉴于以上原因，怀疑基站外部数据/某些网络节点对接数据做错或漏配，查询SA基站5-4外部数据配置，不存在问题。3 .问题结论综上分析，结合跟目标小区存在小概率切换成功和基站5-4的现网配置，可以看出SA基站外部数据没有问题，需联合核心网抓包分析。4,处理措施联合核心网抓包分析，5GC复测定位为AMF与MME地址对接问题，AMF地址变更未通知MME修改，切换目的地址不通导致切换失败，核心网作相应调整后问题解决：已经将该问题加入问题投诉规定动作，节省类似问题的定位时间，提高了团队的工作效率。KPlName1.TETAUpdateSuccessRateKPIValue1OO.OO96LTE2NRHOSuccessRateIoO.0096ZRHandoverSuccessRate100.0096NRIntraFreqHandoverSuccess.100.0096NRPDUSessionESTBSuccess.IOo.0096ZRRRCDropRate0.0096ZRRRCSetupSuccessRate100.0096NRRegistrationSuccessRate100.0096ZRSCdIAddSuccessRateIOo.0096ZRSCdIDropRateO.OO96ZRSCdIRASuccessRate100.0096NR2LTEHOSuccessRate1OO.OO96TimeSou.EventInformation18:07:09.217 MS118:07:09.217 MS1NREventA2MeasConf.NREventAZMeasConf.a2-ThresholdRSRP:-85;.a2-ThresholdRSRP:-120.18:07:09.217 MS118:07:09.229 MS118:07:09.242 MS118:07:09.541 MS1 18:07:09.597 MS1 18:07:20.000 MS1 18:07:20.01 1 MS118:07:20.011 MS118:07:20.552 MSINREventA3MeasConf.NRPDUSessionEstabli.NRPDUSessionEstabli.NRPDUSessionEstabli.NRPDUSessionEstabli.NREventA2NREventAIMeasConf.NREventBIMeasConfigNREventBIa3-OffsetRSRP:2;hyster.pdu-session-identity-val.pdu-session-identity-val.pdu-session-identity-val.pdu-session-identity-val.ServCellPCk461;SerVCelIal-ThresholdRSRP:-8O;.b1-ThreshoIdEUTRARS.ServCeIIPC1:461;ServCell.18:07:20.71418:07:20.75718:07:20.775false18:07:20.694MSlZRZLTEHOAttemptTargetPCl:52;TargetEAR.MS1EETTIRlCrtTQMS1MS1EllUL嚏18:07:20.858 18:07:20.858 18:07:20.858 18:07:20.858 18:07:20.858 18:07:20.858 18:07:20.858 18:07:20.858 18:07:20.960 18:07:21.103 18:07:21.516 18:07:21.51718:07:21.517 18:07:30.717 18:07:30.717 18:07:30.731 18:07:30.731 18:07:30.731 18:07:30.731 18:07:30.765MS1MS1MS1MS1MS1MSIMS1MS1MS1MS1MS1MS1MS1MS1MS1MS1MSIMSlMS1MS11.TEEventAIMeasCon.LTEEventAIMeasCon.LTEEventAIMeasCon.LTEEVentANMeasCon.LTEEventA2MeasCon.LTEEventA2MeasCon.LTEEventA2MeasCon.LTEEventASMeasCon.LTETAUpdateAttemptLTETAUpdateSucLTEEventAILTEEventAILTEEventAILTEEventA31.TEHOA3Measureme.1.TETTIBConfig1.TEHandoverAttemptLTTIntraFreqHOAtg.LTEIntraeNodeBHO.LTEHandoverSuca1-ThresholdRSRP:-105.a1-ThresholdRSRP:-105a1-ThresholdRSRP:-105a2-ThresholdRSRP:-1O8.a2-ThresholdRSRP:-110a2-ThresholdRSRP:-121a2-ThresholdRSRP:-108.a3-Offset:4;hysteresis:1ServCellRSRP:-96ServCellRSRP:-96ServCellRSRP:-96ServCellRSRP:-81;LTE-N.falseTargetPCI:51;TargetEAR.TargetPCk51;TargetEAR.TargetPCkSI;TargetEAR.