TDLTE网络性能KPI切换成功率优化手册簿Word文档格式.docx
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TDLTE网络性能KPI切换成功率优化手册簿Word文档格式.docx
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eNB收到UE发送的“RRC连接重配置完成”消息(RRCConnectionReconfigurationComplete),指示eNB内小区间切换出成功。
1.2.2NSN映射
M8014C14:
INTER_ENB_S1_HO_PREP,ThenumberofIntereNBS1-basedHandoverpreparations;
M8014C19:
INTER_ENB_S1_HO_SUCC,ThenumberofsuccessfulIntereNBS1-basedHandovercompletions;
M8014C0:
INTER_ENB_HO_PREP,ThenumberofInter-eNBX2-basedHandoverpreparations.TheMobilitymanagement(MM)receivesalistwithtargetcellsfromtheRRManddecidestostartanInter-eNBX2-basedHandover;
M8014C7:
SUCC_INTER_ENB_HO,ThenumberofsuccessfulInter-eNBX2-basedHandovercompletions;
M8009C6:
ATT_INTRA_ENB_HO,ThenumberofIntra-eNBHandoverattempts;
M8009C7:
SUCC_INTRA_ENB_HO,ThenumberofsuccessfulIntra-eNBHandovercompletions;
1.3信令统计点
1.3.1eNB间S1切换
Counter
CounterID
NetActname
eNB间S1切换请求次数
M8014C14
INTER_ENB_S1_HO_PREP
eNB间S1切换目标小区准备失败次数
M8014C15
INTER_S1_HO_PREP_FAIL_TIME
M8014C16
INTER_S1_HO_PREP_FAIL_NORR
M8014C17
INTER_S1_HO_PREP_FAIL_OTHER
eNB间S1切换尝试次数
M8014C18
INTER_ENB_S1_HO_ATT
eNB间S1切换成功次数
M8014C19
INTER_ENB_S1_HO_SUCC
eNB间S1切换失败次数
M8014C20
INTER_ENB_S1_HO_FAIL
统计点关系:
M8014C14=M8014C15+M8014C16+M8014C17+M8014C18
M8014C18=M8014C19+M8014C20(注:
现网实际数据对不上)
1、M8014C14:
Updated:
ThiscounterisupdatedfollowingthetransmissionofanS1AP:
HANDOVERREQUIREDmessagefromthesourceeNBtotheMMEifthismessagepreparesanIntereNBHandover.
2、M8014C15:
ThiscounterisupdatedattheexpiryoftheguardingtimerTS1RELOCprepifthetimerwasstartedbecauseofthepreparationofanIntereNBHandover.
3、M8014C16:
ThiscounterisupdatedfollowingthereceptionofanS1AP:
HANDOVERPREPARATIONFAILUREmessagefromMMEtosourceeNBwithcause"
NoRadioResourcesAvailableinTargetCell"
ifthismessageisreceivedinresponsetothepreparationofanIntereNBHandover.
4、M8014C17:
ThenumberoffailedIntereNBS1-basedHandoverpreparationsduetothereceptionofanS1AP:
HANDOVERPREPARATIONFAILUREmessagewithacauseotherthan"
NoRadioResourcesAvailableinTargetCell."
5、M8014C18:
HANDOVERCOMMANDmessagefromtheMMEtothesourceeNBincasethatthismessageisreceivedinresponsetothepreparationofanIntereNBHandover.
6、M8014C19:
UECONTEXTRELEASECOMMANDmessagefromtheMMEtothesourceeNBwiththecausevalueRadioNetworkLayer(SuccessfulHandover)incasethatthismessageisreceivedforanIntereNBHandover.
7、M8014C20:
ThiscounterisupdatedfollowingtheexpiryoftheguardingtimerTS1RELOCoverallincasethatthistimerwasstartedbecauseofanIntereNBHandover.
1.3.2eNB间X2切换
eNB间X2切换请求次数
M8014C0
INTER_ENB_HO_PREP
eNB间X2切换目标小区准备失败次数
M8014C2
FAIL_ENB_HO_PREP_TIME
M8014C3
FAIL_ENB_HO_PREP_AC
M8014C5
FAIL_ENB_HO_PREP_OTHER
eNB间X2切换尝试次数
M8014C6
ATT_INTER_ENB_HO
eNB间X2切换成功次数
M8014C7
SUCC_INTER_ENB_HO
eNB间X2切换失败次数
M8014C8
INTER_ENB_HO_FAIL
M8014C0=M8014C2+M8014C3+M8014C5+M8014C6
M8014C6=M8014C7+M8014C8(注:
1、M8014C0:
ThiscounterisupdatedfollowingthetransmissionofanX2AP:
HandoverRequesttothetargeteNB.
2、M8014C2:
ThiscounterisupdatedfollowingtheexpiryoftheguardingtimerTX2RELOCprep.
3、M8014C3:
ThiscounterisupdatedfollowingthereceptionofanX2AP:
HandoverPreparationFailuremessagefromthetargeteNB.
4、M8014C5:
Thecounterisupdatedifthefailuredetecteddoesnotmatchanyotherfailurecounter.
5、M8014C6:
HandoverRequestAcknowledgemessagefromthetargeteNB.
6、M8014C7:
SUCC_INTER_ENB_HO
ReleaseResourcemessagesentbythetargeteNB.
7、M8014C8:
ThiscounterisupdatedfollowingtheexpiryoftheguardingtimerTX2RELOCoverall.
1.3.3eNB内切换
eNB内收到MR次数
M8009C0
TOT_NOT_START_HO_PREP
eNB内切换决断次数
M8009C1
TOT_HO_DECISION
eNB内切换请求次数
M8009C2
INTRA_ENB_HO_PREP
eNB内切换准备失败次数
M8009C3
M8009C5
FAIL_ENB_HO_PREP_OTH
eNB内切换尝试次数
M8009C6
ATT_INTRA_ENB_HO
eNB内切换成功次数
M8009C7
SUCC_INTRA_ENB_HO
eNB内切换执行失败次数
M8009C8
ENB_INTRA_HO_FAIL
M8009C1>
M8014C2
M8014C2=M8014C3+M8014C5+M8014C6
M8014C6=M8014C7+M8014C8(注:
1、M8009C0:
TOT_NOT_START_HO_PREP
ThereceptionofanRRCMeasurementReportmessagesentbytheUEtoeNBandoftheRRMdecisionnottoexecuteahandover.Updatedtothesourcecell.
2、M8009C1:
TOT_HO_DECISION
ThereceptionofanRRCMeasurementReportmessagesentbytheUEtoeNBandofanRRMdecisiontoexecuteahandover.Updatedtothesourcecell.
3、M8009C2:
INTRA_ENB_HO_PREP
AninternaleNBtrigger.TheeNBMMreceivesalistwiththetargetcellsfromRRManddecidesonanIntra-eNBHandover.Updatedtothesourcecell.
4、M8009C6:
ATT_INTRA_ENB_HO
ThetransmissionofanRRCConnectionReconfigurationmessagesentbytheeNBtoUE,whichindicatesaHandoverCommandtotheUE.Updatedtothesourcecell.
5、M8009C7:
SUCC_INTRA_ENB_HO
ThereceptionofaninternalUEContextReleaseRequestforthehandoveronthesourceside.Updatedtothesourcecell.
6、M8009C3:
FAIL_ENB_HO_PREP_AC
AninternaleNBtrigger.TheeNBMMreceivesalistwiththetargetcellsfromtheRRM.TheMMorRRMACdecidesnottoexecuteanIntra-eNBHandover.Updatedtothesourcecell.
7、M8009C5:
FAIL_ENB_HO_PREP_OTH
AninternaleNBtrigger.TheeNBMMreceivesalistwiththetargetcellsfromRRM.TheMMorRRMACdecidesnottoexecuteanIntra-eNBHandover.Thecounterisupdatedifthefailuredetecteddoesnotmatchanyotherfailurecounter.Updatedtothesourcecell.
8、M8009C8:
ENB_INTRA_HO_FAIL
ThecounterisupdatedtothesourcecellwhentimerTHOoverallexpires.
2影响切换成功率的因素
2.1从信令流程角度分析
(注:
个别流程可以会有不同,但大致相当,此处仅以X2切换为例。
eNB内切换流程更少,eNB间S1切换仅多了有线侧的信令,如果丢失均属于传输侧问题)
2.1.1切换判决阶段
(注:
此阶段不会影响后台统计切换成功率指标)
1)现象:
eNB未收到测量报告
Ø
覆盖、干扰等无线环境问题
因PDCCH问题导致UE上发测量报告的ULGRANT没有收到;
因PUSCH问题导致eNB未收到或收到CRC校验出错)
UE内部处理问题
2)现象:
eNB未发送切换请求
参数问题:
如触发事件门限过晚等,未及时触发测量报告
邻区漏配
黑名单
2.1.2切换准备阶段
切换请求发出,对方未收到
传输丢包
目标小区拒绝
目标小区准入控制、容量问题
3)现象:
目标小区回准备失败
已知的有unknown-MME-Code
其余的需要跟着LOG确定具体原因值
4)现象:
TX2RELOCprep准备超时
目标小区故障、告警
目标小区休眠
2.1.3切换执行阶段
切换命令(RRC连接重配)丢失
UE下行PDCCH解析失败,下行PDCCH受限
UE下行PDSCH解析失败,下行PDSCH受限
切换完成信令(RRC连接重配完成)丢失
UE在目标小区的PREAMBLE,eNB没有收到,上行PRACH受限
UE下行接收RAR失败,下行PDSCH受限
UE上发切换完成,eNB没有收到,上行PUSCH受限
在非真正的目标小区接入失败
PCI混淆
目标小区非最优小区
邻区混乱、漏配
5)现象:
源eNB发起HandoverCancel
切换过程中失步,重建回源小区
目前主要是室分小区休眠问题
2.1.4路径转换阶段
各S1AP信令丢失
各网元内部处理信令失败
S1口传输异常,如传输丢包
X2AP:
UECONTEXTREL丢失
X2口传输异常,如传输丢包
2.2按原因分类汇总分析
3切换成功率分析流程和优化方法
3.1整体分析流程图
3.2从COUNTER指标确定优先排查方向
3.2.1切换准备阶段
阶段
COUNTER
COUNTERNAME
最可能原因
目标小区故障告警、传输丢包
目标小区容量
需跟踪LOG确认
3.2.2切换执行阶段
目前仅有HO_FAIL统计,此统计项的原因值为TX2RELOCoverall、TS1RELOCoverall、THOoverall超时。
还有其他原因,需要跟踪LOG确认。
建议诺基亚厂家后期开发切换执行阶段失败原因值相关COUNTER,方便快速定位问题)
3.3从关联指标定位问题根因
切换失败分类
关联指标
故障告警
告警信息
容量问题
RRC准入拒绝
传输问题
链路闪断;
传输误码超限
无线环境
RSRP、SINR、IBLER、MCS、CQI等
配置问题
邻区漏配、鉴权开关
产品问题
所有指标为"
0"
或"
-"
4切换成功率优化案例
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