TD-LTE网络性能KPI(切换成功率)优化手册.doc

TD-LTE网络性能KPI（切换成功率）优化手册1 切换成功率定义说明1.1 指标公式指标名称集团规范公式NSN映射公式切换成功率（eNB间S1切换出成功次数+ eNB间X2切换出成功次数+ eNB内切换出成功次数）/（eNB间S1切换出请求次数+ eNB间X2切换出请求次数+ eNB内切换出请求次数）*100%100* sum(M8009C7 + M8014C7 + M8014C19) / sum(M8009C6 + M8014C0 + M8014C14)1.2 COUNTER定义1.2.1 集团规范定义1、eNB间S1切换出请求次数： 源eNB向MME发送的“切换请求”消息（HANDOVER REQUIRED）（3GPP TS 36.413），指示eNB间通过S1接口的切换出准备请求。向不同小区发送的同一切换准备请求，需要重复统计。2、eNB间S1切换出成功次数：源eNB收到MME发送的“UE上下文释放命令”消息（UE CONTEXT RELEASE COMMAND）（3GPP TS 36.413），指示eNB间通过S1接口的切换出执行成功。3、eNB间X2切换出请求次数：源eNB向目标eNB发送的“切换请求”消息（HANDOVER REQUEST）（3GPP TS 36.423），指示eNB间通过X2接口的切换出准备请求。向不同小区发送的同一切换准备请求，重复统计。4、eNB间X2切换出成功次数：源eNB收到目标eNB发送的“UE上下文释放”消息（UE CONTEXT RELEASE）（3GPP TS 36.423），指示eNB间通过X2接口的切换出执行成功。5、eNB内切换出请求次数：eNB向UE发送携带mobilityControlInfo 的“RRC连接重配置”消息（RRCConnectionReconfiguration），指示eNB内小区间切换出请求。（3GPP TS 36.331）6、eNB内切换出成功次数：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。（3GPP TS 36.331）1.2.2 NSN映射1、eNB间S1切换出请求次数： M8014C14：INTER_ENB_S1_HO_PREP，The number of Inter eNB S1-based Handover preparations；2、eNB间S1切换出成功次数：M8014C19：INTER_ENB_S1_HO_SUCC，The number of successful Inter eNB S1-based Handover completions；3、eNB间X2切换出请求次数：M8014C0：INTER_ENB_HO_PREP，The number of Inter-eNB X2-based Handover preparations. The Mobility management (MM) receives a list with target cells from the RRM and decides to start an Inter-eNB X2-based Handover；4、eNB间X2切换出成功次数：M8014C7：SUCC_INTER_ENB_HO，The number of successful Inter-eNB X2-based Handover completions；5、eNB内切换出请求次数：M8009C6：ATT_INTRA_ENB_HO，The number of Intra-eNB Handover attempts；6、eNB内切换出成功次数：M8009C7：SUCC_INTRA_ENB_HO，The number of successful Intra-eNB Handover completions；1.3 信令统计点1.3.1 eNB间S1切换CounterCounter IDNetAct nameeNB间S1切换请求次数M8014C14INTER_ENB_S1_HO_PREPeNB间S1切换目标小区准备失败次数M8014C15INTER_S1_HO_PREP_FAIL_TIMEM8014C16INTER_S1_HO_PREP_FAIL_NORRM8014C17INTER_S1_HO_PREP_FAIL_OTHEReNB间S1切换尝试次数M8014C18INTER_ENB_S1_HO_ATTeNB间S1切换成功次数M8014C19INTER_ENB_S1_HO_SUCCeNB间S1切换失败次数M8014C20INTER_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：INTER_ENB_S1_HO_PREPUpdated: This counter is updated following the transmission of an S1AP:HANDOVER REQUIRED message from the source eNB to the MME if this message prepares an Inter eNB Handover.2、M8014C15：INTER_S1_HO_PREP_FAIL_TIMEUpdated: This counter is updated at the expiry of the guarding timer TS1RELOCprep if the timer was started because of the preparation of an Inter eNB Handover.3、M8014C16：INTER_S1_HO_PREP_FAIL_NORRUpdated: This counter is updated following the reception of an S1AP: HANDOVER PREPARATION FAILURE message from MME to source eNB with cause No Radio Resources Available in Target Cell if this message is received in response to the preparation of an Inter eNB Handover.4、M8014C17：INTER_S1_HO_PREP_FAIL_OTHERUpdated: The number of failed Inter eNB S1-based Handover preparations due to the reception of an S1AP: HANDOVER PREPARATION FAILURE message with a cause other than No Radio Resources Available in Target Cell.5、M8014C18：INTER_ENB_S1_HO_ATTUpdated: This counter is updated following the reception of an S1AP: HANDOVER COMMAND message from the MME to the source eNB in case that this message is received in response to the preparation of an Inter eNB Handover.6、M8014C19：INTER_ENB_S1_HO_SUCCUpdated: This counter is updated following the reception of an S1AP: UE CONTEXT RELEASE COMMAND message from the MME to the source eNB with the cause value Radio Network Layer (Successful Handover) in case that this message is received for an Inter eNB Handover.7、M8014C20：INTER_ENB_S1_HO_FAILUpdated: This counter is updated following the expiry of the guarding timer TS1RELOCoverall in case that this timer was started because of an Inter eNB Handover.1.3.2 eNB间X2切换CounterCounter IDNetAct nameeNB间X2切换请求次数M8014C0INTER_ENB_HO_PREPeNB间X2切换目标小区准备失败次数M8014C2FAIL_ENB_HO_PREP_TIMEM8014C3FAIL_ENB_HO_PREP_ACM8014C5FAIL_ENB_HO_PREP_OTHEReNB间X2切换尝试次数M8014C6ATT_INTER_ENB_HOeNB间X2切换成功次数M8014C7SUCC_INTER_ENB_HOeNB间X2切换失败次数M8014C8INTER_ENB_HO_FAIL统计点关系：M8014C0 = M8014C2 + M8014C3 + M8014C5 + M8014C6 M8014C6 = M8014C7 + M8014C8（注：现网实际数据对不上）1、M8014C0：INTER_ENB_HO_PREPUpdated: This counter is updated following the transmission of an X2AP: Handover Request to the target eNB.2、M8014C2：FAIL_ENB_HO_PREP_TIMEUpdated: This counter is updated following the expiry of the guarding timer TX2RELOCprep.3、M8014C3：FAIL_ENB_HO_PREP_ACUpdated: This counter is updated following the reception of an X2AP: Handover Preparation Failure message from the target eNB.4、M8014C5：FAIL_ENB_HO_PREP_OTHERUpdated: The counter is updated if the failure detected does not match any other failure counter.5、M8014C6：ATT_INTER_ENB_HOUpdated: This counter is updated following the reception of an X2AP: Handover Request Acknowledge message from the target eNB.6、M8014C7 ：SUCC_INTER_ENB_HO Updated: This counter is updated following the reception of an X2AP:Release Resource message sent by the target eNB. 7、M8014C8：INTER_ENB_HO_FAILUpdated: This counter is updated following the expiry of the guarding timer TX2RELOCoverall. 1.3.3 eNB内切换CounterCounter IDNetAct nameeNB内收到MR次数M8009C0TOT_NOT_START_HO_PREPeNB内切换决断次数M8009C1TOT_HO_DECISIONeNB内切换请求次数M8009C2INTRA_ENB_HO_PREPeNB内切换准备失败次数M8009C3FAIL_ENB_HO_PREP_ACM8009C5FAIL_ENB_HO_PREP_OTHeNB内切换尝试次数M8009C6ATT_INTRA_ENB_HOeNB内切换成功次数M8009C7SUCC_INTRA_ENB_HOeNB内切换执行失败次数M8009C8ENB_INTRA_HO_FAIL统计点关系：M8009C1 M8014C2 M8014C2 = M8014C3 + M8014C5 + M8014C6 M8014C6 = M8014C7 + M8014C8（注：现网实际数据对不上）1、M8009C0: TOT_NOT_START_HO_PREPUpdated: The reception of an RRC Measurement Report message sent by the UE to eNB and of the RRM decision not to execute a handover. Updated to the source cell.2、M8009C1: TOT_HO_DECISIONUpdated: The reception of an RRC Measurement Report message sent by the UE to eNB and of an RRM decision to execute a handover. Updated to the source cell.3、M8009C2: INTRA_ENB_HO_PREPUpdated: An internal eNB trigger. The eNB MM receives a list with the target cells from RRM and decides on an Intra-eNB Handover. Updated to the source cell.4、M8009C6: ATT_INTRA_ENB_HOUpdated: The transmission of an RRC Connection Reconfiguration message sent by the eNB to UE, which indicates a Handover Command to the UE. Updated to the source cell.5、M8009C7: SUCC_INTRA_ENB_HOUpdated: The reception of an internal UE Context Release Request for the handover on the source side. Updated to the source cell.6、M8009C3: FAIL_ENB_HO_PREP_ACUpdated: An internal eNB trigger. The eNB MM receives a list with the target cells from the RRM. The MM or RRM AC decides not to execute an Intra-eNB Handover. Updated to the source cell.7、M8009C5: FAIL_ENB_HO_PREP_OTHUpdated: An internal eNB trigger. The eNB MM receives a list with the target cells from RRM. The MM or RRM AC decides not to execute an Intra-eNB Handover. The counter is updated if the failure detected does not match any other failure counter. Updated to the source cell. 8、M8009C8: ENB_INTRA_HO_FAILUpdated: The counter is updated to the source cell when timer THOoverall expires.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 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UL GRANT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1）现象：切换请求发出，对方未收到 传输丢包2）现象：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1）现象：切换命令（RRC连接重配）丢失 覆盖、干扰等无线环境问题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2）现象：切换完成信令（RRC连接重配完成）丢失 覆盖、干扰等无线环境问题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3）现象：在非真正的目标小区接入失败 PCI混淆4）现象：目标小区非最优小区 邻区混乱、漏配5）现象：源eNB发起Handover Cancel 覆盖、干扰等无线环境问题切换过程中失步，重建回源小区 目标小区休眠目前主要是室分小区休眠问题2.1.4 路径转换阶段1）现象：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2）现象：X2AP： UE CONTEXT REL丢失 各网元内部处理信令失败 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COUNTERCOUNTER NAME最可能原因eNB间S1切换目标小区准备失败次数M8014C15INTER_S1_HO_PREP_FAIL_TIME目标小区故障告警、传输丢包M8014C16INTER_S1_HO_PREP_FAIL_NORR目标小区容量M8014C17INTER_S1_HO_PREP_FAIL_OTHER需跟踪LOG确认eNB间X2切换目标小区准备失败次数M8014C2FAIL_ENB_HO_PREP_TIME目标小区故障告警、传输丢包M8014C3FAIL_ENB_HO_PREP_AC目标小区容量M8014C5FAIL_ENB_HO_PREP_OTHER需跟踪LOG确认eNB内切换准备失败次数M8009C3FAIL_ENB_HO_PREP_AC目标小区容量M8009C5FAIL_ENB_HO_PREP_OTH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。（注：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