5G NSA和SA掉话故障案例

L,问题故障树&&FaultTree,,,,,,,

"序号

（工具自动生成）&&&&No.

(Automaticallygeneratedbythetool)",L1,L2,L3,L4,L5,L6,判断方法&&IdentificationMethod,解决方案&&Solution

1,掉话&&CallDrop,,,,,,无条件进入&&Noconditionentry,不涉及&&N/A

2,掉话&&CallDrop,NSA场景&&NSA,,,,,"NR配置文件查看NRCELLALGOSWITCH的子开关NsaDcSwitch为开&&ChecktheNRconfigurationfile,theNsaDcSwitchinMONRCELLALGOSWITCHisturnON",不涉及&&N/A

3,掉话&&CallDrop,NSA场景&&NSA,5G发起的异常释放用户&&5Ginitiatesabnormalrelease,,,,"如下条件满足其中1个即可：

1.4GX2接口信令跟踪，5G给4G发送SgNBReleaseRequired消息

2.5GX2接口信令跟踪，5G给4G发送SgNBReleaseRequired消息

3.5G话统N.NsaDc.SgNB.AbnormRel不为0

&&

Eitherofthefollowingconditionsismet:

1.The4GX2interfacesignalingtracingresultshowsthatthe5GnetworksendsaSgNBReleaseRequiredmessagetothe4Gnetwork.

2.The5GX2interfacesignalingtracing.The5GnetworksendsaSgNBReleaseRequiredmessagetothe4Gnetwork.

3.ThecounterN.NsaDc.SgNB.AbnormRelisnot0;",不涉及&&N/A

4,掉话&&CallDrop,NSA场景&&NSA,5G发起的异常释放用户&&5Ginitiatesabnormalrelease,下行RLC最大重传导致掉话&&CalldropduetothedownlinkmaximumnumberofRLCretransmissionsisreached,,,"如下条件满足其中1个即可：

1.4GX2接口信令跟踪，5G给4G发送SGNB_REL_REQUIR消息，原因值radio-connection-with-UE-lost(43)

2.5GX2接口信令跟踪，5G给4G发送X2AP_SGNB_REL_REQUIR消息，原因值radio-connection-with-UE-lost(43)

3.5G话统N.NsaDc.SgNB.AbnormRel.Radio.UeLost有统计；

4.5GCHR日志中，查找L3ChrDuAbnormalRel->InnerAbnormalEvent->RadioFailureInfo->RadioFailureAbnormalMsg->MsgType=RLC_L3_UNRESTORED_IND(8199)的CallID记录数量>0

&&

Eitherofthefollowingconditionsismet:

1.The4GX2interfacesignalingtracingresultshowsthatthegNBsendsaSGNB_REL_REQUIRmessagewithcause:radio-connection-with-UE-lost(43)totheeNB.

2.The5GX2interfacesignalingtracing.ThegNBaX2AP_SGNB_REL_REQUIRmessagewithcause:radio-connection-with-UE-lost(43)totheeNB.

3.ThecounterN.NsaDc.SgNB.AbnormRel.Radioisnot0;

4.Inthe5GCHRlog,querythenumberofcallIDsofL3ChrDuAbnormalRel->RadioFailureInfo->MsgType=8199(themaximumnumberofdownlinkRLCretransmissionmessages)>0",不涉及&&N/A

5,掉话&&CallDrop,NSA场景&&NSA,5G发起的异常释放用户&&5Ginitiatesabnormalrelease,下行RLC最大重传导致掉话&&CalldropduetothedownlinkmaximumnumberofRLCretransmissionsisreached,下行或上行高误码&&HighBLERondownlinkoruplink,,"如下两个条件（下行误码高或者上行误码高）满足其中1个即可：

1.下行误码高：

1).话统计算平均下行IBLER/RBLER/重传率>50%；

平均重传率：（N.DL.SCH.QPSK.TB.Retrans+N.DL.SCH.16QAM.TB.Retrans+N.DL.SCH.64QAM.TB.Retrans+N.DL.SCH.256QAM.TB.Retrans)/(N.DL.SCH.QPSK.TB+N.DL.SCH.16QAM.TB+N.DL.SCH.64QAM.TB+N.DL.SCH.256QAM.TB)

平均IBLER：（N.DL.SCH.QPSK.ErrTB.Ibler+N.DL.SCH.16QAM.ErrTB.Ibler+N.DL.SCH.64QAM.ErrTB.Ibler+N.DL.SCH.256QAM.ErrTB.Ibler)/(N.DL.SCH.QPSK.TB+N.DL.SCH.16QAM.TB+N.DL.SCH.64QAM.TB+N.DL.SCH.256QAM.TB)

平均RBLER：（N.DL.SCH.QPSK.ErrTB.Rbler+N.DL.SCH.16QAM.ErrTB.Rbler+N.DL.SCH.64QAM.ErrTB.Rbler+N.DL.SCH.256QAM.ErrTB.Rbler)/(N.DL.SCH.QPSK.TB+N.DL.SCH.16QAM.TB+N.DL.SCH.64QAM.TB+N.DL.SCH.256QAM.TB)

或者2）.通过CHR事件：L2_USERCHR_DLSCH_HISTORY_INFO下记录的(HarqState0_NACK+HarqState0_DTX)/PdschSchSum>50%可以认为是下行误码过高。

2.上行误码：

1）.话统计算平均上行RBLER/重传率>50%；

平均重传率：（N.UL.SCH.HalfPiBPSK.TB.Retrans+N.UL.SCH.QPSK.TB.Retrans+N.UL.SCH.16QAM.TB.Retrans+N.UL.SCH.64QAM.TB.Retrans+N.UL.SCH.256QAM.TB.Retrans)/(N.UL.SCH.HalfPiBPSK.TB+N.UL.SCH.QPSK.TB+N.UL.SCH.16QAM.TB+N.UL.SCH.64QAM.TB+N.UL.SCH.256QAM.TB)

平均RBLER：（N.UL.SCH.HalfPiBPSK.ErrTB.Rbler+N.UL.SCH.QPSK.ErrTB.Rbler+N.UL.SCH.16QAM.ErrTB.Rbler+N.UL.SCH.64QAM.ErrTB.Rbler+N.UL.SCH.256QAM.ErrTB.Rbler)/(N.UL.SCH.HalfPiBPSK.TB+N.UL.SCH.QPSK.TB+N.UL.SCH.16QAM.TB+N.UL.SCH.64QAM.TB+N.UL.SCH.256QAM.TB)

或者2).通过CHR事件：L2_USERCHR_ULSCH_HISTORY_PUSCH_SLOT_INFO下记录的（PuschCrcNackCnt+PuschCrcDtxCnt)/PuschSchSum>50%可以认为上行误码过高。

&&

1.HighDownlinkBLER：

1）.ThecounteraveragedownlinkIBLER/RBLER/retransmissionrate>50%.

AverageRetransRatio:（N.DL.SCH.QPSK.TB.Retrans+N.DL.SCH.16QAM.TB.Retrans+N.DL.SCH.64QAM.TB.Retrans+N.DL.SCH.256QAM.TB.Retrans)/(N.DL.SCH.QPSK.TB+N.DL.SCH.16QAM.TB+N.DL.SCH.64QAM.TB+N.DL.SCH.256QAM.TB)

AverageDLIBLER：（N.DL.SCH.QPSK.ErrTB.Ibler+N.DL.SCH.16QAM.ErrTB.Ibler+N.DL.SCH.64QAM.ErrTB.Ibler+N.DL.SCH.256QAM.ErrTB.Ibler)/(N.DL.SCH.QPSK.TB+N.DL.SCH.16QAM.TB+N.DL.SCH.64QAM.TB+N.DL.SCH.256QAM.TB)

AverageDLRBLER：（N.DL.SCH.QPSK.ErrTB.Rbler+N.DL.SCH.16QAM.ErrTB.Rbler+N.DL.SCH.64QAM.ErrTB.Rbler+N.DL.SCH.256QAM.ErrTB.Rbler)/(N.DL.SCH.QPSK.TB+N.DL.SCH.16QAM.TB+N.DL.SCH.64QAM.TB+N.DL.SCH.256QAM.TB)

Or2).ThroughtheCHRevent:(HarqState0_NACK+HarqState0_DTX)/PdschSchSuminL2_USERCHR_DLSCH_HISTORY_INFO>50%,considerthedownlinkbiterrorrateistoohigh.

2.HighUplinkBLER：

1).ThecounteraverageuplinkIBLER/RBLER/retransmissionrate>50%.

AverageRetransRatio:（N.UL.SCH.HalfPiBPSK.TB.Retrans+N.UL.SCH.QPSK.TB.Retrans+N.UL.SCH.16QAM.TB.Retrans+N.UL.SCH.64QAM.TB.Retrans+N.UL.SCH.256QAM.TB.Retrans)/(N.UL.SCH.HalfPiBPSK.TB+N.UL.SCH.QPSK.TB+N.UL.SCH.16QAM.TB+N.UL.SCH.64QAM.TB+N.UL.SCH.256QAM.TB)

AverageULRBLER：（N.UL.SCH.HalfPiBPSK.ErrTB.Rbler+N.UL.SCH.QPSK.ErrTB.Rbler+N.UL.SCH.16QAM.ErrTB.Rbler+N.UL.SCH.64QAM.ErrTB.Rbler+N.UL.SCH.256QAM.ErrTB.Rbler)/(N.UL.SCH.HalfPiBPSK.TB+N.UL.SCH.QPSK.TB+N.UL.SCH.16QAM.TB+N.UL.SCH.64QAM.TB+N.UL.SCH.256QAM.TB)

Or2).ThroughtheCHRevent:（PuschCrcNackCnt+PuschCrcDtxCnt)/PuschSchSuminL2_USERCHR_ULSCH_HISTORY_PUSCH_SLOT_INFO,considertheuplinkbiterrorrateistoohigh.high.",不涉及&&N/A

6,掉话&&CallDrop,NSA场景&&NSA,5G发起的异常释放用户&&5Ginitiatesabnormalrelease,下行RLC最大重传导致掉话&&CalldropduetothedownlinkmaximumnumberofRLCretransmissionsisreached,下行或上行高误码&&HighBLERondownlinkoruplink,弱覆盖&&WeakCoverage,"如下两个条件满足其中1个即可：

1.下行弱覆盖：终端侧probe日志，SSBRSRP<-115dBm；

2.上行弱覆盖：5GCHR日志中，L2_USERCHR_SUSRCQISINR_INFO下，取SrsRsrpMeasWriteIndex对应的那组RLCREXSUSRSRP_ARRAY，并且从这组开始，倒数连续三个组里的sSrsRsrp平均值<=-13000；

&&Eitherofthefollowingconditionsismet:

1.Downlink:CheckwhethertheSSBRSRP<-115dBmonUEprobelog.

2.Uplink:Inthe5GCHRlog,inL2_USERCHR_SUSRCQISINR_INFO,obtainthegroupofRLCREXSUSRSRP_ARRAYcorrespondingtoSrsRsrpMeasWriteIndex,andstartfromthisgroup.TheaveragevalueofsSrsRsrpinthelastthreegroupsis<=-13000.","检查是否在主瓣方向，是否有遮挡等。如果距离AAU的确较远，属于正常弱覆盖场景。

&&Checkwhetherthemainlobeisinthemainlobedirectionandwhetherthemainlobeisblocked.IfthedistancefromtheAAUisfarawayfromtheAAU,thisisanormalweakcoveragescenario."

7,掉话&&CallDrop,NSA场景&&NSA,5G发起的异常释放用户&&5Ginitiatesabnormalrelease,下行RLC最大重传导致掉话&&CalldropduetothedownlinkmaximumnumberofRLCretransmissionsisreached,下行或上行高误码&&HighBLERondownlinkoruplink,外部干扰&&Externalinterference,"如下两个条件满足其中1个即可：

1.下行干扰：

1）.如果有终端侧日志，在没有信号强度更好或相当的同频邻区干扰时，SSBRSRP>-120dBm&&SSBSINR<0dB，或者平均CQI低于4；

或者2）.话统“N.ChMeas.CQI.SingleCW.0~N.ChMeas.CQI.SingleCW.15”加权平均小于4。CSIRSRP>-120dBm&&CSISINR<0dB；

2.上行干扰：

1）.CHR判断方法：5GCHR日志中，L2_USERCHR_SUSRCQISINR_INFO下，取SrsRsrpMeasWriteIndex对应的那组RLCREXSUSRSRP_ARRAY，并且从这组开始，倒数连续三个组里的sSrsRsrp平均值>-12000

并且L2_USERCHR_SUSRCQISINR_INFO下，取SrsSinrMeasWriteIndex对应那组RLCREXSUSRSIN_ARRAY，从这组开始，倒数连续三个组里的SrsSinr平均值<0；

或者2）.话统判断方法：N.UL.NI.Avg>-100或N.UL.NI.Min>-105

&&Eitherofthefollowingconditionsismet:

1.DownlinkInterference：

1).UElog,thereisnointra-frequencyneighboringcellwithbettersignalstrengthorequivalentsignalstrength.Inaddition,

SSBRSRP>-120dBm&&SSBSINR<0dBor,theaverageCQIislowerthan4;

Or2).Thecounter“N.ChMeas.CQI.SingleCW.0~N.ChMeas.CQI.SingleCW.15”averagevalue<4,andCSIRSRP>-120dBm&&CSISINR<0dB;

2.UplinkInterference:

1).CheckbyCHR:

Inthe5GCHRlog,thevalueofRLCREXSUSRSRP_ARRAYcorrespondingtoSrsRsrpMeasWriteIndexisobtainedfromL2_USERCHR_SUSRCQISINR_INFO.TheaveragevalueofsSrsRsrpinthelastthreegroupsis>-12000.

Inaddition,inL2_USERCHR_SUSRCQISINR_INFO,theSrsSinrcorrespondingtoSrsSinrMeasWriteIndexisobtained.Fromthisgroup,theaveragevalueofRLCREXSUSRSIN_ARRAYinthelastthreeconsecutivegroupsis<0.

Or2).Checkbyconter:N.UL.NI.Avg>-100ORN.UL.NI.Min>-105","参考通道干扰故障树排查是否存在环回干扰或外部干扰，查找并消除外部干扰源&&Checkwhetherloopbackinterferenceorexternalinterferenceexistsaccordingtothe""ChannelInterference""faulttree.Ifyes,locateandeliminateexternalinterferencesources."

8,掉话&&CallDrop,NSA场景&&NSA,5G发起的异常释放用户&&5Ginitiatesabnormalrelease,下行RLC最大重传导致掉话&&CalldropduetothedownlinkmaximumnumberofRLCretransmissionsisreached,下行或上行高误码&&HighBLERondownlinkoruplink,同频切换门限过大&&Theintra-frequencyhandoverthresholdistoolarge.,"同时满足：

1.5G配置文件，查询测试QCI使用的测量公共参数组NRCellQciBearer.IntraFreqHoMeasGroupId：LSTNRCELLQCIBEARER:NrCellId=X,Qci=X;

2.5G配置文件，查询该参数组里的同频切换门限（RsrpOffset）和切换迟滞（Hysteresis）之和是否大于10，即5dB。LSTNRCellQciBearer:IntraFreqHoMeasGroupId=X,MeasurementEventType=INTRA_FREQ_EVENT_A3;

&&Thefollowingconditionsareallmet:

1.5GChecktheconfigurationfiletogetNRCellQciBearer.IntraFreqHoMeasGroupIdofQCIusedbytheUE：LSTNRCELLQCIBEARER:NrCellId=X,Qci=X;

2.5GChecktheconfigurationfilewhetherthesumofRsrpOffsetandHysteresisintheparametergroupisgreaterthan10,thatis,5dB.LSTGNBMEASCOMMPARAMGRP:MeasCommonParamGroupId=1,MeasurementEventType=INTRA_FREQ_EVENT_A3;","减小切换门限和切换迟滞之和到5dB以下:MODGNBMEASCOMMPARAMGRP:MeasCommonParamGroupId=1,MeasurementEventType=INTRA_FREQ_EVENT_A3,Hysteresis=2,RsrpOffset=4;

&&

DecreasethesumofRsrpOffsetandHysteresistolessthan5dB.

MODGNBMEASCOMMPARAMGRP:MeasCommonParamGroupId=1,MeasurementEventType=INTRA_FREQ_EVENT_A3,Hysteresis=2,RsrpOffset=4;"

9,掉话&&CallDrop,NSA场景&&NSA,5G发起的异常释放用户&&5Ginitiatesabnormalrelease,下行RLC最大重传导致掉话&&CalldropduetothedownlinkmaximumnumberofRLCretransmissionsisreached,下行或上行高误码&&HighBLERondownlinkoruplink,未配置邻区导致不切换&&Handoversarenottriggeredbecauseneighboringcellsarenotconfigured,"同时满足：

1、LTEUU跟踪收到RRC_UL_INFO_TANSF_MRDC后1s内，X2接口没有收到gNB发的SGNB_MOD_REQUIRED或者SGNB_CHANGE_REQUIRED；

2、LTEUU跟踪查询RRC_UL_INFO_TANSF_MRDC里携带的PCI，在5G配置文件中，没有配置外部小区NREXTERNALCELL或者没有配置邻区NRCELLRELATION；

&&

Anyofthefollowingconditionsismet:

1.AfterreceivingtheRRC_UL_INFO_TANSF_MRDCmessageattheLTEUuinterface,LTEUUinterfacedoesnotreceivetheSGNB_MOD_REQUIREDmessagefromthegNBwithin1sthroughputtheX2interface.

2.ThePCIincludeinRRC_UL_INFO_TANSF_MRDCofLTEUuinterface,notfoundthecorrespondingNREXTERNALNCELLorNRCELLRELATIONin5Gconfiguraionfile.","正确配置外部小区ADDNREXTERNALCELL和邻区ADDNRCELLRELATION；

&&

CorrectconfigurationtheexternalcellsandneighboringcellsinsourcegNBbycommand:ADDNREXTERNALCELLandADDNRCELLRELATION."

10,掉话&&CallDrop,NSA场景&&NSA,5G发起的异常释放用户&&5Ginitiatesabnormalrelease,下行RLC最大重传导致掉话&&CalldropduetothedownlinkmaximumnumberofRLCretransmissionsisreached,下行或上行高误码&&HighBLERondownlinkoruplink,4G侧回复拒绝导致不切换&<Ereject5GHandoverChangeRequest,"以下任一条件满足：

1、X2接口收到gNB发的SGNB_MOD_REQUIRED后，并且包含信元：rrcReconfiguration->CellGroupConfig->spCellConfig->reconfigurationWithSync->spCellConfigCommon->physCellId，空口没有下发RRC_CONN_RECFG，直接给gNB回复SGNB_MOD_REFUSE；

2、X2接口收到gNB发的SGNB_CHANGE_REQUIRED后，X2没有发起SGNB_ADD_REQ，直接给gNB回复SGNB_CHANGE_REFUSE；

&&

Anyofthefollowingconditionsismet:

1.AfterreceivingtheX2interferenceSGNB_MOD_REQUIREDmessagefromthegNB,whichincludeiterm:rrcReconfiguration->CellGroupConfig->spCellConfig->reconfigurationWithSync->spCellConfigCommon->physCellId,theeNodeBdoesnotsendsRRC_CONN_RECFGonUU,butsendsaSGNB_MOD_REFUSEmessagetothegNB.

2.AfterreceivingtheX2interferenceSGNB_CHANGE_REQUIREDmessagefromthegNB,theeNodeBdoesnotsendsSGNB_ADD_REQtotargetgNB,butsendsaSGNB_CHANGE_REFUSEmessagetothegNB.","任选其一:

1.添加NR小区为LTE外部小区和邻区ADDNREXTERNALCELL/ADDNRNRELATIONSHIP，正确配置X2接口（参考特性文档“LTE和NRNSAX2和S1接口自管理特性参数描述”MML配置章节）。

或者

2.联系LTE工程师分析解决

&&Choosethefollowingone:

1.CorrectconfigurationtheexternalcellsandneighboringcellsinsourcegNBbycommand:ADDNREXTERNALCELL/ADDNRNRELATIONSHIP,CorrectconfigurationtheX2interface(refertoFPD""X2andS1Self-ManagementinNSANetworkingFeatureParameterDescription""UsingMMLCommands)

2.GetsupportforLTEengineertocheckthereason"

11,掉话&&CallDrop,NSA场景&&NSA,5G发起的异常释放用户&&5Ginitiatesabnormalrelease,下行RLC最大重传导致掉话&&CalldropduetothedownlinkmaximumnumberofRLCretransmissionsisreached,下行或上行高误码&&HighBLERondownlinkoruplink,5G目标站准备失败导致不切换&&5Gtargetsitehandoverpreparefailure,"X2跟踪，LTE收到源gNB发的SGNB_CHANGE_REQUIRED后，向目标gNB发出SGNB_ADD_REQ，没有收到SGNB_ADD_REQ_ACK;或者收到SGNB_ADD_REQ_REJ;

&&

AfterreceivingtheSGNB_CHANGE_REQUIREDmessagefromthesourcegNBatX2traceandsendtheSGNB_ADD_REQ,LTEnotreceivetheSGNB_ADD_REQ_ACK,orreceivetheSGNB_ADD_REQ_REJfromtargetgNB.

","反馈5G目标站点配置和主控板日志给研发分析。

&&

FeedbacktheconfigurationandtheMPTboardlogofthe5GtargetsitetoR&Dforanalysis."

12,掉话&&CallDrop,NSA场景&&NSA,5G发起的异常释放用户&&5Ginitiatesabnormalrelease,下行RLC最大重传导致掉话&&CalldropduetothedownlinkmaximumnumberofRLCretransmissionsisreached,下行或上行高误码&&HighBLERondownlinkoruplink,"基站没有配置SRS资源导致无法进行TA调整，移动场景下掉话

&&TAadjustmentcannotbeperformedbecausethegNBisnotconfiguredwithSRSresources.Asaresult,calldropsoccurinmobilescenarios.","以下任一条件满足：

1.UU口跟踪，基站给UE发的RRC_CONN_RECFG消息里不携带SRS(SRS-Config信元下是空的，不包含srs-ResourceSetToAddModList和srs-ResourceToAddModList)，由于删除了SRS，基站无法测量TA并下发TA调整，导致下行链路或上行链路解调出错，最终gNB发SGNB_REL_REQUIRED，携带原因值：failure-in-the-radio-interface-procedure

2.UU口跟踪，基站给UE发的RRC_CONN_RECFG消息里释放了SRS资源（包含信元srs-ResourceSetToReleaseList和srs-ResourceToReleaseList）。

由于SRS没有配置，基站无法测量TA并下发TA调整，导致下行链路或上行链路解调出错，最终gNB发SGNB_REL_REQUIRED，携带原因值：failure-in-the-radio-interface-procedure

&&

1.TheUUtrace,eNBsendsRRC_CONN_RECFGdoesnotcarrytheSRS(theSRS-ConfigIEisempty,excludingthesrs-ResourceSetToAddModListandsrs-ResourceToAddModListIEs).

AftertheSRSisdeleted,thegNBcannotmeasuretheTAanddelivertheTAadjustment.Asaresult,thedownlinkoruplinkdemodulationfails,andthegNBsendstheSGNB_REL_REQUIREDmessagecarryingthecausevalue.Failure-in-the-radio-interface-procedure

2.TheUUtrace,gNBreleaseSRSresourcesbysendingRRC_CONN_RECFGtotheUE(includingthesrs-ResourceSetToReleaseListandsrs-ResourceToReleaseListIEs).

BecausetheSRSisnotconfigured,thebasestationcannotmeasuretheTAanddelivertheTAadjustment.Asaresult,thedownlinkoruplinkdemodulationfails,andthegNBsendstheSGNB_REL_REQUIREDmessagecarryingthecausevalue.Failure-in-the-radio-interface-procedure","增大SRS周期：

MODNRDUCELLRSVDOPTPARAM:NrDuCellId=*,ParamId=97,Param1=1;

其中Param1的值根据如下原则：

演示，FW1基带板，单用户比拼4T8R：1

演示，FW2基带板，单用户比拼4T8R：2

演示，FW2单用户比拼2T4R：1

其他场景：4

&&

IncreasetheSRSperiodbyfollowingMML:

MODNRDUCELLRSVDOPTPARAM:NrDuCellId=*,ParamId=97,Param1=1;

ThevalueofParam1mustcomplywiththefollowingrules:

Demonstration,FW1basebandboard,4T8Rforasingleuser:1

Demonstration,FW2basebandboard,singleusercompetition4T8R:2

Demonstration:FW2single-subscribercomparison2T4R1

Otherscenarios:4"

13,掉话&&CallDrop,NSA场景&&NSA,5G发起的异常释放用户&&5Ginitiatesabnormalrelease,下行RLC最大重传导致掉话&&CalldropduetothedownlinkmaximumnumberofRLCretransmissionsisreached,下行或上行高误码&&HighBLERondownlinkoruplink,"特定传播环境导致定时偏差，超CP

&&TimingoffsetandexceedingCPcausedbyaspecificwirelesspropagationenvironment","（不能工具化）同时满足：

1、终端probe日志侧存在DCI漏检；或上、下行高误码；CHR日志中看到下行调度或上行调度的HARQ反馈大部分是NACK或DTX

（L2_USERCHR_DLSCH_HISTORY_INFO>>HarqState0_DTX/HarqState0_NACK

L2_USERCHR_ULSCH_HISTORY_PUSCH_SLOT_INFO>>PuschCrcDtxCnt/PuschCrcNackCnt）

2、终端Probe上查看CPE的CPInformation有很多大于2343ns的统计；

3、参考L5下行或上行高误码节点排除参数配置错误，弱覆盖，干扰等问题后；

&&

Itcannotautomaticanalyzedbytool.Thefollowingallconditionsaremet:

1.DCImissingdetectionorhighULBLER/DLBLERexistsontheUEprobeside,（L2_USERCHR_DLSCH_HISTORY_INFO>>HarqState0_DTX/HarqState0_NACK

L2_USERCHR_ULSCH_HISTORY_PUSCH_SLOT_INFO>>PuschCrcDtxCnt/PuschCrcNackCnt）.

2.TherearealargenumberofcountofCP>2343nsonProbeforCPE.

3.Theproblemisnotcausedbyincorrectparametersettings,weakcoverage,orinterferenceasthetheL5""HighBLERondownlinkoruplink"".","该问题是特定位置信号传播环境导致，建议更换测试点，或尝试调整AAU机械倾角或方向角；

&&

ReplacethetestpointortrytoadjustthemechanicaltiltangleorazimuthangleoftheAAU."

14,掉话&&CallDrop,NSA场景&&NSA,5G发起的异常释放用户&&5Ginitiatesabnormalrelease,下行RLC最大重传导致掉话&&CalldropduetothedownlinkmaximumnumberofRLCretransmissionsisreached,下行或上行高误码&&HighBLERondownlinkoruplink,"UE距离天线过近，功率饱和导致误码高&&TheUEistooclosetotheantenna,andthepowerissaturated.Asaresult,biterrorsarehigh.","同时满足：

1、上行或下行误码高；（判断方法参考L5下行或上行高误码）

2、观察UE侧probe日志SSBRSRP大于-60dBm

&&

Thefollowingallconditionsaremet:

1.TheuplinkordownlinkBLERishigh.(Fordetailsabouttheidentificationmethod,refer""HighBLERondownlinkoruplink""intheL5node.)

2.CheckthevalueofSSBRSRPintheUEprobelogisgreaterthan-60dBm","通过降低基站发射功率，或者移动UE到更远的地方，确保SSBRSRP不高于-65dBm。

&&

ReducethetransmitpowerofthebasestationormovetheUEtoafarplacetoensurethattheSSBRSRPisnothigherthan-65dBm."

15,掉话&&CallDrop,NSA场景&&NSA,5G发起的异常释放用户&&5Ginitiatesabnormalrelease,下行RLC最大重传导致掉话&&CalldropduetothedownlinkmaximumnumberofRLCretransmissionsisreached,下行或上行高误码&&HighBLERondownlinkoruplink,mate20x联合附着但核心网不支持CS域&&TheMate20Xtriggerthecombined-attachbutcorenetworknotsupportcausedtheNRdrop,"同时满足：

1、上行或下行误码高；（判断方法参考L5下行或上行高误码）

2、LTE侧S1接口信令可以看到10s为周期，4次的S1AP_UL_NAS_TRANSF消息，然后LTE触发S1AP_UE_CONTEXT_REL_REQ原因值为radio-connection-with-ue-lost；

&&

Thefollowingallconditionsaremet:

1.TheuplinkordownlinkBLERishigh.(Fordetailsabouttheidentificationmethod,refer""HighBLERondownlinkoruplink""intheL5node.)

2.TheS1interfacetraceofLTEshowthereare4timesS1AP_UL_NAS_TRANSFwith10speriod,then,LTEsendtheS1AP_UE_CONTEXT_REL_REQwithcause:radio-connection-with-ue-lost

","1.修改终端模式为EPS-ONLY规避；

或者2.修正核心网支持CS域是最终解决方案。

&&

1.ChangethephonetoEPS-ONLYmode；

Or2.TheCNchangetosupporttheCSdomain."

16,掉话&&CallDrop,NSA场景&&NSA,5G发起的异常释放用户&&5Ginitiatesabnormalrelease,下行RLC最大重传导致掉话&&CalldropduetothedownlinkmaximumnumberofRLCretransmissionsisreached,下行或上行高误码&&HighBLERondownlinkoruplink,下行固定高RANK导致误码高NR掉话&&theRANKbefixedinconfigurationcausedtheNRreleasedbyhighBLER,"同时满足：

1、上行或下行误码高；（判断方法参考L5下行或上行高误码）

2、配置NRDuCellRsvdParam.RsvdU8Param67配置为非零。

&&

Thefollowingallconditionsaremet:

1.TheuplinkordownlinkBLERishigh.(Fordetailsabouttheidentificationmethod,refer""HighBLERondownlinkoruplink""intheL5node.)

2.NRDuCellRsvdParam.RsvdU8Param67isnon-zero.

","修改为RANK自适应：MODNRDuCellRsvdParam:NRDUCELLID=XX，RsvdU8Param67=0；

&&CleartheFixRANKvalue:MODNRDuCellRsvdParam:NRDUCELLID=XX，RsvdU8Param67=0；"

17,掉话&&CallDrop,NSA场景/NSA,5G发起的异常释放用户&&5Ginitiatesabnormalrelease,下行RLC最大重传导致掉话&&CalldropduetothedownlinkmaximumnumberofRLCretransmissionsisreached,下行或上行高误码&&HighBLERondownlinkoruplink,基站与终端选阶表不一致&&gNBandUEusethedifferenceMCStable,"以下条件同时满足时概率性出现:

1、基站版本为19BC11SPC130以及之前版本；

2、上行或下行误码高；（判断方法参考L4节点中的“下行高误码”和“上行高误码”）；

3、LTE切换NR不变场景基站RRC_CONN_RECF消息中重配NRBWP的downlinkBWP-ToAddModlist信源中没有携带mcs-table信元，并且5G设置Dl256QamSwitch为ON；

4、信道条件较好，从Probe观测MCS19阶以上，基站会选择256AQM；

&&

Thereisapossibilitythatthisproblemoccurswhenthefollowingconditionsaremet:

1.TheBTSversionis19BC11SPC130orearlier.

2.Theuplinkordownlinkbiterrorsarehigh.Fordetails,see""DownlinkHighBitErrorRate""and""UplinkHighBitErrorRate""intheL4node.

3.InthescenariowhereLTEhandoversandNRremainunchanged,thedownlinkBWP-ToAddModlistmessagesentbytheeNodeBtoreconfigureNRBWPintheRRC_CONN_RECFmessagedoesnotcarrythemcs-tableIE,andtheDl256QamSwitchparameterinthe5GMOissettoON.

4.Thechannelconditionsaregood.WhentheProbeisusedtoobservetheMCS19levelorhigher,theBTSselects256AQM.","1、复位规避；

2、或者SPC130以后版本解决；

&&1.ResetAPP;2.OrupgradetotheR15.1SPC130orlaterversion"

18,掉话&&CallDrop,NSA场景&&NSA,5G发起的异常释放用户&&5Ginitiatesabnormalrelease,下行RLC最大重传导致掉话&&CalldropduetothedownlinkmaximumnumberofRLCretransmissionsisreached,参数不合理导致掉话&&Calldropduetoinappropriateparametersettings.,,"如下条件满足其中1个即可：

1.4GX2接口信令跟踪，5G给4G发送SgNBReleaseRequired消息，原因值radio-connection-with-UE-lost(43)

2.5GX2接口信令跟踪，5G给4G发送SgNBReleaseRequired消息，原因值radio-connection-with-UE-lost(43)

3.5G话统N.NsaDc.SgNB.AbnormRel.Radio.UeLost有统计；

4.5GCHR日志中，查找L3ChrDuAbnormalRel->InnerAbnormalEvent->RadioFailureInfo->RadioFailureAbnormalMsg->MsgType=RLC_L3_UNRESTORED_IND(8199)的CallID记录数量>0

&&

Eitherofthefollowingconditionsismet:

1.The4GX2interfacesignalingtracingresultshowsthatthegNBsendsaSgNBReleaseRequiredmessagewithcause:radio-connection-with-UE-lost(43)totheeNB.

2.The5GX2interfacesignalingtracing.ThegNBaSgNBReleaseRequiredmessagewithcause:radio-connection-with-UE-lost(43)totheeNB.

3.ThecounterN.NsaDc.SgNB.AbnormRel.Radioisnot0;

4.Inthe5GCHRlog,querythenumberofcallIDsofL3ChrDuAbnormalRel->RadioFailureInfo->MsgType=8199(themaximumnumberofdownlinkRLCretransmissionmessages)>0",不涉及&&N/A

19,掉话&&CallDrop,NSA场景&&NSA,5G发起的异常释放用户&&5Ginitiatesabnormalrelease,下行RLC最大重传导致掉话&&CalldropduetothedownlinkmaximumnumberofRLCretransmissionsisreached,参数不合理导致掉话&&Calldropduetoinappropriateparametersettings.,"GNB和终端的双DCI开关不一致&&

InconsistentDual-DCISwitchesBetweentheGNBandtheUE","检查5G基站配置打开了双DCI开关(NRDUCellRsvdOptParam.Param1WithParamId102=1)；

&&

Checkwhetherthedual-DCIswitch(NRDUCellRsvdOptParam.Param1WithParamId102=1)isenabledongNB","关闭双DCI开关：MODNRDUCELLRSVDOPTPARAM:NrDuCellId=*,ParamId=102,Param1=0;

&&

Disablethedual-DCIswitchoftheGNBbyfollowingcommand:MODNRDUCELLRSVDOPTPARAM:NrDuCellId=*,ParamId=102,Param1=0;

"

20,掉话&&CallDrop,NSA场景&&NSA,5G发起的异常释放用户&&5Ginitiatesabnormalrelease,下行RLC最大重传导致掉话&&CalldropduetothedownlinkmaximumnumberofRLCretransmissionsisreached,参数不合理导致掉话&&Calldropduetoinappropriateparametersettings.,"19A版本打开了SSBRateMatch开关导致下行高误码

&&

Inversions19A,theRateMatchswitchisturnedon,leadingtohighdownlinkbiterrors.","以下两个条件同时满足：

1、LSTSOFTWARE查看5G版本包含V100R015C00；

2、5G配置文件查看NRDUCELLPDSCH.RateMatchSwitch下SSB_RATEMATCH_SW为1

&&

Thefollowingconditionsmustbemet:

1.LSTSOFTWAREshowstheGNBversionisV100R015C00.

2.The5GCFGfilecheck,valuesofSSB_RATEMATCH_SWinNRDUCELLPDSCH.RateMatchSwitchis1.","关闭SSB的RateMatch开关：

MODNRDUCELLPDSCH:NrDuCellId=*,RateMatchSwitch=SSB_RATEMATCH_SW-0;

&&

SwitchofftheRateMatchofSSBbyfollowingcommand:

MODNRDUCELLPDSCH:NrDuCellId=*,RateMatchSwitch=SSB_RATEMATCH_SW-0;"

21,掉话&&CallDrop,NSA场景&&NSA,5G发起的异常释放用户&&5Ginitiatesabnormalrelease,下行RLC最大重传导致掉话&&CalldropduetothedownlinkmaximumnumberofRLCretransmissionsisreached,参数不合理导致掉话&&Calldropduetoinappropriateparametersettings.,"19A版本打开了PDCCHRateMatch开关导致下行高误码

&&

Inversions19A,theRateMatchswitchisturnedon,leadingtohighdownlinkbiterrors.","以下两个条件同时满足：

1、LSTSOFTWARE查看5G版本包含V100R015C00；

2、5G配置文件查看NRDUCELLPDSCH.RateMatchSwitch下PDCCH_RATEMATCH_SW为1

&&

Thefollowingconditionsmustbemet:

1.LSTSOFTWAREshowstheGNBversionisV100R015C00.

2.The5GCFGfilecheck,valuesofPDCCH_RATEMATCH_SWinNRDUCELLPDSCH.RateMatchSwitchis1.","关闭PDCCH的RateMatch开关：

MODNRDUCELLPDSCH:NrDuCellId=*,RateMatchSwitch=PDCCH_RATEMATCH_SW-0;

&&

SwitchofftheRateMatchofPDCCHbyfollowingcommand:

MODNRDUCELLPDSCH:NrDuCellId=*,RateMatchSwitch=PDCCH_RATEMATCH_SW-0;"

22,掉话&&CallDrop,NSA场景&&NSA,5G发起的异常释放用户&&5Ginitiatesabnormalrelease,下行RLC最大重传导致掉话&&CalldropduetothedownlinkmaximumnumberofRLCretransmissionsisreached,参数不合理导致掉话&&Calldropduetoinappropriateparametersettings.,"5GRLC参数配置不合理导致掉话

&&

Calldropsduetoimpropersettingofthe5GRLCparameter","以下条件同时满足：

1、X2接口显示NR给LTE发送SgNB_Rel_Required，携带原因值：radio-connection-with-UE-lost(43)

2、配置文件查询5G的NRCELLQCIBEARER里对应QCI的RlcMode=AM，记录AmRlcParamGroupId，在GNBRLCPARAMGROUP里对应的RLC参数组满足如下设置：DlRlcSnSize=12,UeAmStatusRptProhibitTmr=0,gNBAmByteThldForTrigPoll=Infinity,gNBPduNumThldForTrigPoll=Infinity

&&

Thefollowingconditionsmustbemet:

1.X2traceshowsGNBsendSgNB_Rel_Requiredwithcause:radio-connection-with-UE-lost(43)

2.Theconfigurationfilecheck,theserviceQCIisRlcMode=AMinNRCELLQCIBEARERMO,andtherecordtheAmRlcParamGroupId,tofindthosefollowingparametersinGNBRLCPARAMGROUPofthegNBmeetsthefollowingrequirements:DlRlcSnSize=12,UeAmStatusRptProhibitTmr=0,gNBAmByteThldForTrigPoll=Infinity,gNBPduNumThldForTrigPoll=Infinity","修改对应QCI的RLC参数组为如下值：MODGNBRLCPARAMGROUP:RlcParamGroupId=*,RlcMode=AM,gNBAmByteThldForTrigPoll=KB25,gNBPduNumThldForTrigPoll=PDU32,UeAmStatusRptProhibitTmr=MS5,DlRlcSnSize=BITS18;

&&

ModifytheRLCParametersofrelativeQCIbyfollowingMML:MODGNBRLCPARAMGROUP:RlcParamGroupId=*,RlcMode=AM,gNBAmByteThldForTrigPoll=KB25,gNBPduNumThldForTrigPoll=PDU32,UeAmStatusRptProhibitTmr=MS5,DlRlcSnSize=BITS18;"

23,掉话&&CallDrop,NSA场景&&NSA,5G发起的异常释放用户&&5Ginitiatesabnormalrelease,下行RLC最大重传导致掉话&&CalldropduetothedownlinkmaximumnumberofRLCretransmissionsisreached,参数不合理导致掉话&&Calldropduetoinappropriateparametersettings.,SRSP0配置过低&&TheSRSP0configurationistoolow.,"5G基站配置检查SRSP0(NRDUCellRsvd.RsvdParam55)的值介于[1~108],或者等于227。

&&

Check5Gconfiguration,whetherthevalueofNRDUCellRsvd.RsvdParam55in[1~108]orequleto227ongNB","修改NRDUCellRsvd.RsvdParam55等于0:MODNRDUCELLRSVD:NrDuCellId=*,RsvdParam55=0

&&SettheparameterNRDUCellRsvd.RsvdParam55to0:MODNRDUCELLRSVD:NrDuCellId=*,RsvdParam55=0;"

24,掉话&&CallDrop,NSA场景&&NSA,5G发起的异常释放用户&&5Ginitiatesabnormalrelease,下行RLC最大重传导致掉话&&CalldropduetothedownlinkmaximumnumberofRLCretransmissionsisreached,参数不合理导致掉话&&Calldropduetoinappropriateparametersettings.,上行闭环功控的RSRP门限设置过低&&TheRSRPthresholdforuplinkclosed-looppowercontrolistoolow.,"检查5G基站配置上行闭环功控门限(NRDUCellRsvd.RsvdParam105)的值介于[1~108],或者等于227。

&&

Check5Gconfiguration,whetherthevalueofNRDUCellRsvd.RsvdParam105in[1~108]orequleto227ongNB","修改NRDUCellRsvd.RsvdParam105等于0:MODNRDUCELLRSVD:NrDuCellId=*,RsvdParam105=0;

&&SettheparameterNRDUCellRsvd.RsvdParam105to0:MODNRDUCELLRSVD:NrDuCellId=*,RsvdParam105=0;"

25,掉话&&CallDrop,NSA场景/NSA,5G发起的异常释放用户&&5Ginitiatesabnormalrelease,下行RLC最大重传导致掉话&&CalldropduetothedownlinkmaximumnumberofRLCretransmissionsisreached,参数不合理导致掉话&&Calldropduetoinappropriateparametersettings.,"mate20X，MU场景下DMRS参数配置不正确&&MATE20X,MUscenario,DMRSparameterssetincorrect.","以下条件同时满足：

1、mate20X终端，MU场景；

2、NRDUCELLRSVD:NrDuCellId=xx,RsvdSwParam1=RSVDSWPARAM1_BIT2-1;

3、NRDUCELLPDSCH：NrDuCellId=XX，DlDmrsConfigType=Type1,DlDmrsMaxLength=2;或者NRDUCELLPDSCH：NrDuCellId=XX，DlDmrsConfigType=Ty