TD-LTE网络性能KPI(切换成功率)优化手册

1、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（HANDOVE

2、R 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

3、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

4、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

5、 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：

6、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_TIMEM8

7、014C16INTER_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：I

8、NTER_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

9、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 Availabl

10、e 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 o

11、ther 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 Inte

12、r 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 H

13、andover.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M801

14、4C2FAIL_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_

15、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 foll

16、owing 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

17、 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

18、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_

19、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 ex

20、ecute 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 r

21、eceives 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

22、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 R

23、RM 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 fail

24、ure 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

25、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UL GRANT没有收到；因PUSCH问题导致eNB未收到或收到CRC校验出错）Ø UE内部处理问题2）现象：eNB未发送切换请求Ø 参数问题：如触发事件门限过晚等，未及时触发测量报告Ø 邻区漏配Ø 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Ø 传输丢包2）现象：目标小区拒绝Ø 目标小区准入控制、容量问题3）现象：目标小区回准备失败Ø 已知的有unk

26、nown-MME-CodeØ 其余的需要跟着LOG确定具体原因值4）现象： TX2RELOCprep准备超时Ø 目标小区故障、告警Ø 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Ø 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Ø 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Ø PCI混淆4）现象：目标小区非最优小区Ø 邻区混乱、漏配5）现象：源eNB发起Handover CancelØ 覆盖、干扰等无线环境问题切换过程中失步，重建回源小区Ø 目标小区休眠目前主