Lte kpi accessability
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This document summarizes various LTE KPIs and performance metrics related to random access, RRC connection establishment, ERAB establishment, and issues that may impact them. It provides potential causes for high values or failures in these metrics as well as recommended actions to investigate like checking RF parameters, capacity, licenses, alarms, configuration, and optimizing physical antenna settings.
Lte kpi accessability
- 1. LTE KPI Accessability Random Access Contention Based random Access (CBRA) pmRaAttCbra , pmRaSuccCbra pmRaFailCbraMsg2Disc , pmRaFailCbraMsg1DiscOoc pmRaFailCbraMsg1DiscSched rachRootSequence , cellRange qRxLevMin , preambleInitialReceivedTargetPower powerRampingStep (Hardcoded) , preambleTransMax (Hardcoded) numberOfRA-Preambles (Hardcoded) Improve RF conditions (by parameters or physical optimization (tilt/azimuth/antenna height)) Check RSI planning (ex. For 15km cell range, diff of 10 between 2 neighbours) Tune RACH related parameters , also check symptoms for sleeping cell (mentioned below) Contension Free Random Access (CFRA) pmRaAttCfra pmRaSuccCfra pmRaFailCfraMsg2Disc pmRaAllocCfra pmRaUnassignedCfraFalse pmRaUnassignedCfraSum pmRaFailCfraMsg1DiscOoc pmRaFailCfraMsg1DiscSched rachRootSequence , cellRange qRxLevMin , preambleInitialReceivedTargetPower powerRampingStep (Hardcoded) , preambleTransMax (Hardcoded) numberOfRA-Preambles (Hardcoded) Improve RF conditions (by parameters or physical optimization (tilt/azimuth/antenna height)) Check RSI planning (ex. For 15km cell range, diff of 10 between 2 neighbours) Tune RACH related parameters , also check symptoms for sleeping cell (mentioned below) SSSR (Session setup sucess rate) RRC connection pmRrcConnEstabAtt (pmRrcConnEstabAttDta , pmRrcConnEstabAttEm pmRrcConnEstabAttHpa , pmRrcConnEstabAttMod pmRrcConnEstabAttMos , pmRrcConnEstabAttMta) pmRrcConnEstabAttReatt (pmRrcConnEstabAttReattDta , pmRrcConnEstabAttReattEm pmRrcConnEstabAttReattHpa , pmRrcConnEstabAttReattMod pmRrcConnEstabAttReattMos , pmRrcConnEstabAttReattMta) pmRrcConnEstabSucc (pmRrcConnEstabSuccDta , pmRrcConnEstabSuccEm pmRrcConnEstabSuccHpa , pmRrcConnEstabSuccMod pmRrcConnEstabSuccMos , pmRrcConnEstabSuccMta) Capacity cause MP load pmRrcConnEstabFailHighLoad (MP load control) pmRrcConnEstabFailOverload (procedure latency supervision) pmRrcConnMax , pmRrcConnLevSum pmProcessorCoreLoad , pmProcessorLoad pmProcessorLoadDistr noOfPucchCqiUsers , noOfPucchSrUsers , pdcchCfiMode tInactivityTimer , dlMaxRetxThreshold , ulMaxRetxThreshold qOffsetcellEUtran , qRxLevMin , SchedulingAlgorithm , crsGain tPollRetransmitUl (DRB & SRB) , tPollRetransmitDl (DRB & SRB) numInitialAccessAndIncomingHo (system constant) , SpdcchLaGinrMargin (system constant) ulInterferenceForgettingFactor (system constant) , deltaPsdRs2Tx (system constant ) Tune parameters as mentioned beside. Physical changes (Tilt , Azimuth , height of antenna) Reduce size of TA , reduces no. of cells being paged so reduces the CPU load in the MP. MP capacity of DUS is higher than DUL , to increase MP capacity DUL can be replaced by DUS Reduce no. of HO by physical opti or features (UE Level Oscillating Handover Minimization & Automated Mobility Optimization Tune cell reselection parameters to offload traffic to nearby cells License pmRrcConnEstabFailActiveUserLicenseExceeded pmActiveUeDlSum pmActiveUeDlSectorCarrierDistr pmActiveUeDlMax pmActiveUeDlSumQci pmActiveUeUlSum pmActiveUeUlMax pmActiveUeUlSectorCarrierDistr pmActiveUeUlSumLcg noOfPucchCqiUsers , noOfPucchSrUsers , pdcchCfiMode tInactivityTimer , dlMaxRetxThreshold , ulMaxRetxThreshold qOffsetcellEUtran , qRxLevMin , SchedulingAlgorithm , crsGain Tune parameters mentioned aside Physical changes (Tilt , Azimuth , height of antenna) Tune cell reselection parameters to offload traffic to nearby cells pmRrcConnEstabFailLic pmLicConnectedUsersLicense , pmLicConnectedUsersTimeCong pmLicConnectedUsersHardLimit , pmLicConnectedUsersActual pmLicConnectedUsersDistr noOfPucchCqiUsers , noOfPucchSrUsers , pdcchCfiMode tInactivityTimer , dlMaxRetxThreshold , ulMaxRetxThreshold qOffsetcellEUtran , qRxLevMin , SchedulingAlgorithm , crsGain Upgrade license for number of connected users Physical changes (Tilt , Azimuth , height of antenna) Tune parameters as mentioned beside. Radio Cause pmRrcConnEstabFailFailureInRadioProcedure Poor DL SINR (CQI) pmRadioUeRepCqiDistr , pmRadioUeRepCqiDistr2 maximumTransmissionPower partOfSectorPower confOutputPower crsGain pdschTypeBGain Tune related parameters (as mentioned beside) , Physical optimization (Tilt , Azimuth , height of antenna Identify overshooting cells causing interference in DL , Audit cell reselection parameters Coverage issues pmBadCovEvalReport pmRadioTbsPwrRestricted pmBadCovSearchEvalReport maximumTransmissionPower partOfSectorPower confOutputPower crsGain pdschTypeBGain Indoor coverage issue (Small cell , PICO , DOT , Hetnet) Physical changes (Tilt , Azimuth , height of antenna) Audit cell reselection parameters & Tune DL power related parameters (as mentioned beside) also Check if there is scope of new site UL RSSI pmRadioRecInterferencePwr pmRadioRecInterferencePwrPucch pmRadioRecInterferencePwrPrb1~100 pmSinrPucchDistr , pmSinrPuschDistr pZeroNominalPucch pZeroNominalPusch Check Power control parameters Features like IRC & UL FSS can help to reduce UL interference. Check for Loose Connectors,Faulty Antenna(Tx & Rx antenna ports),VSWR alarms,Faulty TMA Connections/settings. External interference (cable tv , repeaters (due to power leak issues) , airport , police communication system etc..) Other Causes pmRrcConnReestFailLicMtReest pegged due to lack of license of feature Multi-Target RRC Connection Reestablishment pmRrcConnEstabFailLackOfResources pmPrbUtilDl pmPrbUtilUl noOfPucchCqiUsers , noOfPucchSrUsers , pdcchCfiMode tInactivityTimer , qRxLevMin , dlMaxRetxThreshold ulMaxRetxThreshold , qOffsetcellEUtran SchedulingAlgorithm , crsGain Tune parameters mentioned aside Physical changes (Tilt , Azimuth , height of antenna) Tune cell reselection parameters to offload traffic to nearby cells pmRrcConnEstabFailUnspecified Mainly pegged due to eNB issues pmRrcConnEstabFailBearerAdmissionRej (SRB admission control) PmPdcchCceUtil pdcchAdmThreshold , noOfPucchCqiUsers , noOfPucchSrUsers pdcchCfiMode , tInactivityTimer , qRxLevMin dlMaxRetxThreshold , ulMaxRetxThreshold qOffsetcellEUtran , SchedulingAlgorithm , crsGain SRB admission control Tune parameters mentioned aside Physical changes (Tilt , Azimuth , height of antenna) Tune cell reselection parameters MME overload pmRrcConnEstabFailMmeOvlMos pmRrcConnEstabFailMmeOvlMod Check parameters related to MME Overload Control feature & MME Dimensioning Other checks Low number of attempt If there are more then 1 carrier optimize load balancing parameter Optimize tilt/azimuth/antenna height to balance traffic from near by sites check for alarms or other hardware issues Availability Cell down Cell Down Auto pmCellDowntimeAuto pmCellDownLockAuto eNodeB Cause Configuration issues ensure proper configuration , especially for all new site which are integrated recently Auto Restart Ensure the eNodeB structure of the restart, MP、Baseband or RRU lh all llog -l (do complete eNB health checkup) Baseband Startup issue Baseband Trace can be used , te enable all bbmcBbOmMeSwU Transport Cause S1 issues pmErabRelAbnormalEnbActTnFail check for alarms like Service Unavailable(S1 connection failure) EPC Cause check for alarms like Service Unavailable(S1 connection failure) , Ip packet loss "above" SGW Cell Down Manually pmCellDowntimeMan pmCellDownLockMan Operation Cause manually locked during network configuration issues ((eg. adding/changing/removing hardware) manually locked during parameter change (eg. activate feature) Sleeping Cell pmRaAttCbra pmRaSuccCbra pmRaFailCbraMsg2Disc pmRaAttCfra pmRaSuccCfra pmRaFailCfraMsg2Disc pmRaAllocCfra pmRrcConnEstabAtt pmRrcConnSucc Verify symptoms for sleeping cell Trace(Baseband) trace from MSG1 to MSG5 , verify symtoms for sleeping cells Non-access issue Configuration issue Power setting issue Check SectorEquipmentFunction:ConfiguredOutputPower & Eutrancelltdd:partOfSectorPower Idle mode parameter issue Check Eutrancelltdd MO cell selection and reselection parameters & 3G&2G cell reselection parameter/feature Operation issues Cell Barred Check Cell Barred , acBarring for different scenarios HW Cause Alarms Common alarm : "resource configuration disable" , RRU fault , link failure , Check current & history alarms & take necessary action according to type of Alarm Check RRU status , Reset boards , Verify SW on node S1 links down due to faulty interface board. VSWR CABX , verify VSWR on all ports of antenna TMA check Faulty TMA Connections & faulty settings S1 SIGNALLING CONNECTION PmS1SigConnEstabAtt (pmS1SigConnEstabAttHpa , pmS1SigConnEstabAttMod pmS1SigConnEstabAttMta , pmS1SigConnEstabAttMos pmS1SigConnEstabAttDta , pmS1SigConnEstabAttEm) PmS1SigConnEstabSucc (pmS1SigConnEstabSuccEm , pmS1SigConnEstabSuccHpa pmS1SigConnEstabSuccMod , pmS1SigConnEstabSuccMta pmS1SigConnEstabSuccMos , pmS1SigConnEstabSuccDta) pmS1SigConnEstabFailMmeOvlMos Check MME signalling dimensioning Other Checks TN issue Check S1 interface , S1 links down due to faulty interface board TAC wrong configure & LAC-TAC mapping Configure Correct TAC as per planning & ensure correct TAC LAC Mapping CN abnormal release Cell trace and check with Core Engineer ERAB ESTABLISHMENT PmErabEstabAttInit (pmErabEstabAttInitArp , pmErabEstabAttInitPa) PmErabEstabSuccInit. (pmErabEstabSuccInitArp , pmErabEstabSuccInitPa) PmErabEstabAttAdded (pmErabEstabAttAddedArp , pmErabEstabAttAddedPa) PmErabEstabSuccAdded (pmErabEstabSuccAddedArp , pmErabEstabSuccAddedPa) pmErabEstabAttAddedHoOngoing pmErabEstabAttAddedHoOngoingArp PM Counter pmErabEstabFailGbrDlEnb dlNonGbrRatio , dlTransNwBandwidth Tune Dynamic GBR Admission Control related parameter pmErabEstabFailGbrUlEnb ulNonGbrRatio , ulTransNwBandwidth Tune Dynamic GBR Admission Control related parameter License pmErabEstabFailAddedLic Check license & Feature state of Multiple Radio Bearer per user or RLC UM pmErabEstabFailInitLic Check license & Feature state of Multiple Radio Bearer per user or RLC UM pmErabModFailLic Lack of license of Dynamic QoS Modification Radio Cause Poor DL SINR (CQI) pmRadioUeRepCqiDistr pmRadioUeRepCqiDistr2 maximumTransmissionPower partOfSectorPower confOutputPower crsGain pdschTypeBGain Tune related parameters (as mentioned beside) , Audit cell reselection parameters Physical optimization (Tilt , Azimuth , height of antenna) Identify overshooting cells causing interference in DL Coverage issues pmBadCovEvalReport pmRadioTbsPwrRestricted pmBadCovSearchEvalReport maximumTransmissionPower partOfSectorPower confOutputPower crsGain pdschTypeBGain Indoor coverage issue (Small cell , PICO , DOT , Hetnet) Physical changes (Tilt , Azimuth , height of antenna) Audit cell reselection parameters & Tune DL power related parameters (as mentioned beside) also Check if there is scope of new site UL RSSI pmRadioRecInterferencePwr pmRadioRecInterferencePwrPucch pmRadioRecInterferencePwrPrb1~100 pmSinrPucchDistr , pmSinrPuschDistr pZeroNominalPucch pZeroNominalPusch Check Power control parameters Features like IRC & UL FSS can help to reduce UL interference. Check for Loose Connectors,Faulty Antenna(Tx & Rx antenna ports),VSWR alarms,Faulty TMA Connections/settings. External interference (cable tv , repeaters (due to power leak issues) , airport , police communication system etc..) Other checks HW Cause Availability Cell down Cell Down Auto pmCellDowntimeAuto pmCellDownLockAuto eNodeB Cause Configuration issues ensure proper configuration , especially for all new site which are integrated recently Auto Restart Ensure the eNodeB structure of the restart, MP、Baseband or RRU lh all llog -l (do complete eNB health checkup) Baseband Startup issue Baseband Trace can be used , te enable all bbmcBbOmMeSwU Transport Cause S1 issues pmErabRelAbnormalEnbActTnFail check for alarms like Service Unavailable(S1 connection failure) EPC Cause check for alarms like Service Unavailable(S1 connection failure) , Ip packet loss "above" SGW Cell Down Manually pmCellDowntimeMan pmCellDownLockMan Operation Cause manually locked during network configuration issues ((eg. adding/changing/removing hardware) manually locked during parameter change (eg. activate feature) Sleeping Cell pmRaAttCbra pmRaSuccCbra pmRaFailCbraMsg2Disc pmRaAttCfra pmRaSuccCfra pmRaFailCfraMsg2Disc pmRaAllocCfra pmRrcConnEstabAtt pmRrcConnSucc Verify symtoms for sleeping cell Catch Trace(Baseband) trace from MSG1 to MSG5 , verify symtoms for sleeping cells Non-access issue Configuration issue Power setting issue Check SectorEquipmentFunction:ConfiguredOutputPower & Eutrancelltdd:partOfSectorPower Idle mode parameter issue Check Eutrancelltdd MO cell selection and reselection parameters & 3G&2G cell reselection parameter/feature Operation issues Cell Barred Check Cell Barred , acBarring for different scenarios Alarms Common alarm : "resource configuration disable" , RRU fault , link failure , Check current & history alarms & take necessary action according to type of Alarm Check RRU status , Reset boards , Verify SW on node S1 links down due to faulty interface board. VSWR CABX , verify VSWR on all ports of antenna TMA check Faulty TMA Connections & faulty settings Counter Parameters Action Plan Legend ACCESSABILITY-L14B EGI-Network Engineering- LRAN