TD-LTE網(wǎng)絡性能KPI(切換成功率)優(yōu)化手冊

1、TD-LTE網(wǎng)絡性能KPI（切換成功率）優(yōu)化手冊1 切換成功率定義說明1.1 指標公式指標名稱集團規(guī)范公式NSN映射公式切換成功率（eNB間S1切換出成功次數(shù)+ eNB間X2切換出成功次數(shù)+ eNB內(nèi)切換出成功次數(shù)）/（eNB間S1切換出請求次數(shù)+ eNB間X2切換出請求次數(shù)+ eNB內(nèi)切換出請求次數(shù)）*100%100* sum(M8009C7 + M8014C7 + M8014C19) / sum(M8009C6 + M8014C0 + M8014C14)1.2 COUNTER定義1.2.1 集團規(guī)范定義1、eNB間S1切換出請求次數(shù)： 源eNB向MME發(fā)送的“切換請求”消息（HANDOVE

2、R REQUIRED）（3GPP TS 36.413），指示eNB間通過S1接口的切換出準備請求。向不同小區(qū)發(fā)送的同一切換準備請求，需要重復統(tǒng)計。2、eNB間S1切換出成功次數(shù)：源eNB收到MME發(fā)送的“UE上下文釋放命令”消息（UE CONTEXT RELEASE COMMAND）（3GPP TS 36.413），指示eNB間通過S1接口的切換出執(zhí)行成功。3、eNB間X2切換出請求次數(shù)：源eNB向目標eNB發(fā)送的“切換請求”消息（HANDOVER REQUEST）（3GPP TS 36.423），指示eNB間通過X2接口的切換出準備請求。向不同小區(qū)發(fā)送的同一切換準備請求，重復統(tǒng)計。4、eNB

3、間X2切換出成功次數(shù)：源eNB收到目標eNB發(fā)送的“UE上下文釋放”消息（UE CONTEXT RELEASE）（3GPP TS 36.423），指示eNB間通過X2接口的切換出執(zhí)行成功。5、eNB內(nèi)切換出請求次數(shù)：eNB向UE發(fā)送攜帶mobilityControlInfo 的“RRC連接重配置”消息（RRCConnectionReconfiguration），指示eNB內(nèi)小區(qū)間切換出請求。（3GPP TS 36.331）6、eNB內(nèi)切換出成功次數(shù)：eNB收到UE發(fā)送的“RRC連接重配置完成”消息（RRCConnectionReconfigurationComplete），指示eNB內(nèi)小區(qū)間切

4、換出成功。（3GPP TS 36.331）1.2.2 NSN映射1、eNB間S1切換出請求次數(shù)： M8014C14：INTER_ENB_S1_HO_PREP，The number of Inter eNB S1-based Handover preparations；2、eNB間S1切換出成功次數(shù)：M8014C19：INTER_ENB_S1_HO_SUCC，The number of successful Inter eNB S1-based Handover completions；3、eNB間X2切換出請求次數(shù)：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間X2切換出成功次數(shù)：M8014C7：SUCC_INTER_ENB_HO，The number of successful Inter-eNB X2-based Handover completions；5、eNB內(nèi)切換出請求次數(shù)：M8009C6：

6、ATT_INTRA_ENB_HO，The number of Intra-eNB Handover attempts；6、eNB內(nèi)切換出成功次數(shù)：M8009C7：SUCC_INTRA_ENB_HO，The number of successful Intra-eNB Handover completions；1.3 信令統(tǒng)計點1.3.1 eNB間S1切換CounterCounter IDNetAct nameeNB間S1切換請求次數(shù)M8014C14INTER_ENB_S1_HO_PREPeNB間S1切換目標小區(qū)準備失敗次數(shù)M8014C15INTER_S1_HO_PREP_FAIL_TIMEM8

7、014C16INTER_S1_HO_PREP_FAIL_NORRM8014C17INTER_S1_HO_PREP_FAIL_OTHEReNB間S1切換嘗試次數(shù)M8014C18INTER_ENB_S1_HO_ATTeNB間S1切換成功次數(shù)M8014C19INTER_ENB_S1_HO_SUCCeNB間S1切換失敗次數(shù)M8014C20INTER_ENB_S1_HO_FAIL統(tǒng)計點關系：M8014C14 = M8014C15 + M8014C16 + M8014C17 + M8014C18 M8014C18 = M8014C19 + M8014C20（注：現(xiàn)網(wǎng)實際數(shù)據(jù)對不上）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間X2切換CounterCounter IDNetAct nameeNB間X2切換請求次數(shù)M8014C0INTER_ENB_HO_PREPeNB間X2切換目標小區(qū)準備失敗次數(shù)M801

14、4C2FAIL_ENB_HO_PREP_TIMEM8014C3FAIL_ENB_HO_PREP_ACM8014C5FAIL_ENB_HO_PREP_OTHEReNB間X2切換嘗試次數(shù)M8014C6ATT_INTER_ENB_HOeNB間X2切換成功次數(shù)M8014C7SUCC_INTER_ENB_HOeNB間X2切換失敗次數(shù)M8014C8INTER_ENB_HO_FAIL統(tǒng)計點關系：M8014C0 = M8014C2 + M8014C3 + M8014C5 + M8014C6 M8014C6 = M8014C7 + M8014C8（注：現(xiàn)網(wǎng)實際數(shù)據(jù)對不上）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內(nèi)切換CounterCounter IDNetAct nameeNB內(nèi)收到MR次數(shù)M8009C0TOT_NOT_START_HO_PREPeNB內(nèi)切換決斷次數(shù)M8009C1TOT_HO_DECISIONeNB內(nèi)切換請求次數(shù)M8009C2INTRA_ENB_HO_PREPeNB內(nèi)切換準備失敗次數(shù)M8009C3FAIL_ENB_HO_PREP_ACM8009C5FAIL_ENB_HO_PREP_OTHeNB內(nèi)切換嘗試次數(shù)M8009C6ATT_INTRA_ENB_HOeNB內(nèi)切換成功次數(shù)M8009C7SUCC_

19、INTRA_ENB_HOeNB內(nèi)切換執(zhí)行失敗次數(shù)M8009C8ENB_INTRA_HO_FAIL統(tǒng)計點關系：M8009C1 > M8014C2 M8014C2 = M8014C3 + M8014C5 + M8014C6 M8014C6 = M8014C7 + M8014C8（注：現(xiàn)網(wǎng)實際數(shù)據(jù)對不上）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 影響切換成功率的因素2.1 從信令流程角度分析（注：個別流程可以會有不同，但大致相當，此處僅以X2切換為例。eNB內(nèi)切換流程更少，eNB間S1切換僅多了有線側(cè)的信令，如果丟失均屬于傳輸側(cè)問題）2.1.1 切換判決

25、階段 （注：此階段不會影響后臺統(tǒng)計切換成功率指標）1）現(xiàn)象：eNB未收到測量報告Ø 覆蓋、干擾等無線環(huán)境問題因PDCCH問題導致UE上發(fā)測量報告的UL GRANT沒有收到；因PUSCH問題導致eNB未收到或收到CRC校驗出錯）Ø UE內(nèi)部處理問題2）現(xiàn)象：eNB未發(fā)送切換請求Ø 參數(shù)問題：如觸發(fā)事件門限過晚等，未及時觸發(fā)測量報告Ø 鄰區(qū)漏配Ø 黑名單2.1.2 切換準備階段1）現(xiàn)象：切換請求發(fā)出，對方未收到Ø 傳輸丟包2）現(xiàn)象：目標小區(qū)拒絕Ø 目標小區(qū)準入控制、容量問題3）現(xiàn)象：目標小區(qū)回準備失敗Ø 已知的有unk

26、nown-MME-CodeØ 其余的需要跟著LOG確定具體原因值4）現(xiàn)象： TX2RELOCprep準備超時Ø 目標小區(qū)故障、告警Ø 目標小區(qū)休眠2.1.3 切換執(zhí)行階段1）現(xiàn)象：切換命令（RRC連接重配）丟失Ø 覆蓋、干擾等無線環(huán)境問題UE下行PDCCH解析失敗，下行PDCCH受限UE下行PDSCH解析失敗，下行PDSCH受限2）現(xiàn)象：切換完成信令（RRC連接重配完成）丟失Ø 覆蓋、干擾等無線環(huán)境問題UE在目標小區(qū)的PREAMBLE，eNB沒有收到，上行PRACH受限UE下行接收RAR失敗，下行PDSCH受限UE上發(fā)切換完成，eNB沒有收到，上行PUSCH受限3）現(xiàn)象：在非真正的目標小區(qū)接入失敗Ø PCI混淆4）現(xiàn)象：目標小區(qū)非最優(yōu)小區(qū)Ø 鄰區(qū)混亂、漏配5）現(xiàn)象：源eNB發(fā)起Handover CancelØ 覆蓋、干擾等無線環(huán)境問題切換過程中失步，重建回源小區(qū)Ø 目標小區(qū)休眠目前主