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1.2COUNTER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）1.2.2NSN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1.3.1eNB间S1切换统计点关系：M8014C14= M8014C15 + M8014C16 + M8014C17 + M8014C18M8014C18 = 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 RadioResources Available in Target Cell" if this message is received in response to thepreparation of an Inter eNB Handover.4、M8014C17：INTER_S1_HO_PREP_FAIL_OTHERUpdated: The number of failed Inter eNB S1-based Handover preparations due tothe reception of an S1AP: HANDOVER PREPARATION FAILURE message with acause 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 isreceived 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 causevalue Radio Network Layer (Successful Handover) in case that this message isreceived for an Inter eNB Handover.7、M8014C20：INTER_ENB_S1_HO_FAILUpdated: This counter is updated following the expiry of the guardingtimer TS1RELOCoverall in case that this timer was started because of an Inter eNB Handover.1.3.2eNB间X2切换统计点关系：M8014C0= M8014C2+ M8014C3+ M8014C5+ M8014C6M8014C6= 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 receptionof an X2AP: Handover Preparation Failure message from thetarget eNB.4、M8014C5：FAIL_ENB_HO_PREP_OTHERUpdated: The counter is updated if the failure detected does not match any otherfailure counter.5、M8014C6：ATT_INTER_ENB_HOUpdated: This counter is updated following the receptionof an X2AP: Handover Request Acknowledge message fromthe target eNB.6、M8014C7 ：SUCC_INTER_ENB_HOUpdated: This counter is updated following the reception of an X2AP:Release Resource message sent by the targeteNB.7、M8014C8：INTER_ENB_HO_FAILUpdated: This counter is updated following the expiry of the guardingtimer TX2RELOCoverall.1.3.3eNB内切换统计点关系：M8009C1> M8014C2M8014C2= M8014C3+ M8014C5+ M8014C6M8014C6 = 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 toeNB 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 toeNB 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 cellsfrom 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 bythe eNB to UE, which indicates a Handover Command to the UE.Updated to thesource cell.5、M8009C7: SUCC_INTRA_ENB_HOUpdated: The reception of an internal UE Context Release Request for the handoveron 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 cellsfrom 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 cellsfrom RRM. The MM or RRM AC decides not to execute an Intra-eNB Handover. Thecounter 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。