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X2切换失败问题分析案例1.1故障现象：网优统计站点指标时发现YCJHjinhugongshangsuoLF_3的X2切换成功率较低，只有60%-70%。1.2故障分析1.2.1站点故障检查查看站点本身是否存在故障以及与周边站点之间的X2及邻区关系是否已经关联上，经检查站点没有硬件故障，X2关系也正常。1.2.2calltrace分析收取站点的calltrace，发现主要是在源小区（YCJHjinhugongshangsuoLF_3）切向目标小区（YCJHdengdabinguan_2）出现切换准备失败。在切向其他站点也出现了X2切换准备失败：且从calltrace上看,都是AMBR100000000的,rel10的ue,发起的HOrequest势必失败。另外从收集的uecallptrace中看到引起X2切换失败的counter为L12709_7和L12773_0。15816[0x801030ed]UECALLPupos_trace_output_selector_types.cc#605@traceProcedure:EvaluatecallTraceMode=1rfTraceMode=0ddTraceMode=0,procedureName:X2HandoverPreparationFailure75482:1A01Callp06:42:20.86008945120040[0x801030ed]UECALLPuecall_rft.cc#927@rft_setX2RxFlag:RFTrft_setX2RxFlag:075483:1A031Callp06:42:20.8600952355784[0x801030ed]UECALLPcnaut_sta_gaut.cc#42@executeTransition:CNU_EVT_CNAUT_PROCEVTSeqNb[58]Ctx[0xf48f5a80]UCtx[0xf48f5a7c]Msg[0x127a3788]Evt[x2aphandoverprepfail]Autom[uecall_x2ap]State[wait_x2ap_handover_comp]75484:1A019Callp06:42:20.8601009955760[0x801030ed]UECALLPgcpp_timer_service.cc#662@stop:CNU_EVT_GCPP_TIMER_STOPUserId[1061101]Class[ID_CLA_UECALL]Interval[3000]X2apHandoverRequestTimer75485:1A031Callp06:42:20.8601068755880[0x801030ed]UECALLPcnaut_sta_gaut.cc#42@executeTransition:CNU_EVT_CNAUT_PROCEVTSeqNb[59]Ctx[0xf48f5a80]UCtx[0xf48f5a7c]Msg[(nil)]Evt[int_x2ap_fail]Autom[uecall_x2apOutReloc]State[wson_x2ap_handover]75486:1A031Callp06:42:20.8601106193744[0x801030ed]UECALLPcnaut_sta_gaut.cc#42@executeTransition:CNU_EVT_CNAUT_PROCEVTSeqNb[60]Ctx[0xf48f5a80]UCtx[0xf48f5a7c]Msg[(nil)]Evt[int_x2apoutreloc_fail]Autom[uecall_core]State[wson_x2apoutreloc]75487:1A01Callp06:42:20.86013049119872[0x801030ed]UECALLPpmla.cc#367@pmla_pegCounter:LocationId=0,CounterId=12708(Counter_Id_VSOutgoingInterENodeBX2HOFailureSum),ScreeningId=0(Screen_Id_None),IncrementValue=175488:1A01Callp06:42:20.86015029119800[0x801030ed]UECALLPpmla.cc#367@pmla_pegCounter:LocationId=0,CounterId=12709(Counter_Id_VSOutgoingInterENodeBX2HOFailure),ScreeningId=7(Counter_12709_Scr_Id_InterFreqHOPreparationFailureOther),IncrementValue=175489:1A01Callp06:42:20.86016140311112[0x801030ed]UECALLPuecall_pcmd.cc#1205@uecall_pcmd_pegFailCode:PCMDfailCode=775490:1A01Callp06:42:20.86017376312360[0x801030ed]UECALLPpmla.cc#367@pmla_pegCounter:LocationId=0,CounterId=12773(Counter_Id_VSOutgoingGapAssistedHOFailureSum),ScreeningId=0(Counter_12773_Scr_Id_IntraLTE),IncrementValue=175491:1A01Callp06:42:20.86019214718384[0x801030ed]UECALLPuecallp_fill_ie.cc#92@uecallp_fillCellId:DEBUG_INFOcellId=0x815348a75492:1A01Callp06:42:20.8602015079360[0x801030ed]UECALLPuerrm_csfb.cc#113@uerrm_isCsfb:isCsfb=075493:1A01Callp06:42:20.8602068355328[0x801030ed]UECALLPuerrm_csfb.cc#113@uerrm_isCsfb:isCsfb=075494:1A01Callp06:42:20.86021900312168[0x801030ed]UECALLPuerrm_embms.cc#115@uerrm_isCallWithEmbmsPriority:MII.isMbmsPriorityr11=FALSE,MII.mbmsPriorityr11=RRC_MBMS_PRIORITYR11_TRUE,isHpaCall=FALSE,isEmergencyCall=FALSE,isVoipCall=FALSE,ignoreMbmsPriorityForVoIPCalls=TRUE,isPriorityEmbms=FALSE75495:1A01Callp06:42:20.8602240675064[0x801030ed]UECALLPuerrm_csfb.cc#113@uerrm_isCsfb:isCsfb=075496:1A01Callp06:42:20.8602281234056[0x801030ed]UECALLPuerrm_csfb.cc#113@uerrm_isCsfb:isCsfb=075497:1A01Callp06:42:20.8602337155592[0x801030ed]UECALLPuerrm_embms.cc#58@uerrm_isHighLevelErab:isHighLevelErab=075498:1A01Callp06:42:20.8602391155400[0x801030ed]UECALLPuerrm_mobility_inter.cc#1432@uerrm_isRedirectionForEmbms:isRedirectionEmbmsToTrigger=075499:1A01Callp06:42:20.8602436754560[0x801030ed]UECALLPuerrm_mobility_inter.cc#1660@uerrm_x2apOutRelocFail:NO_ACTION:mobility(out_reloc)procedurefailure75500:1A01Callp06:42:20.8602484514776[0x801030ed]UECALLPuecallp.cc#537@clearInterFreqHoOnGoingFlags:setm_isInterFreqHoOnGoing&m_isInterFreqHoOnGoingForEbmstofalse75501:1A01Callp06:42:20.86030665158200[0x801030ed]UECALLPuecall.cc#1232@setIsHoFailure:HOPreparationFailure=FALSE之后收取对应的目标小区的uecallplog，分析目标站点为什么没有回应源站点的请求，目标小区站点的uecllaplog:1240183:1A01Callp06:33:38.9895689605260[0x80002573]UECALLPuerrm_mobility_inter.cc#2316@uerrm_fullConfigureDecision:TRUE!=pActivationService-isFullConfigForHandoverAllowed=fullconfigreject1240184:1A04Callp06:33:38.98961802049060[0x80002573]UECALLPuerrm_mobility_inter.cc#2674@uerrm_x2apHandoverRequest:Warning:FULLDEC_REJECT:uerrm_fullConfigureDecisionnotsupport1240185:1A039Callp06:33:38.989732280114260[0x80002573]UECALLPcnaut_sta_gaut.cc#65@executeTransition:CNU_EVT_CNAUT_PROCEVTSeqNb[2]Ctx[0x491a8e58]UCtx[0x491a8e54]Msg[(nil)]Evt[int_x2apinreloc]Autom[uecall_x2apInReloc]State[wfath_idle]1240186:1A01Callp06:33:38.98977710044820[0x80002573]UECALLPuecall_x2apInReloc_p.cc#71@uecall_x2apInReloc_rrmDecision:rrmDecision-REJECT1240187:1A01Callp06:33:38.9897841807080[0x80002573]UECALLPuecall_x2apInReloc_p.cc#387@uecall_x2apInReloc_isX2apHandoverAckSend:Haven'treceivedX2apHoCancelyet,sosendHOAck1240188:1A012Callp06:33:38.9911625801378400[0x80002573]UECALLPgcpp.cc#1746@send:CNU_EVT_GCPP_MESSAGE_SENDMsg[0x6082ecc8]SizeMsg[61]AppId[(UECP,Mono)-(SCTP,Mono)]Class[ID_CLA_UECALL-