ACCESSABILITY-L14B
Contention Based random Access (CBRA)
Random Access
Contension Free Random Access (CFRA)
pmRaAttCbra , pmRaSuccCbra
pmRaFailCbraMsg2Disc , pmRaFailCbraMsg1DiscOoc
pmRaFailCbraMsg1DiscSched
pmRaAttCfra
pmRaSuccCfra
pmRaFailCfraMsg2Disc
pmRaAllocCfra
pmRaUnassignedCfraFalse
pmRaUnassignedCfraSum
pmRaFailCfraMsg1DiscOoc
pmRaFailCfraMsg1DiscSched
rachRootSequence , cellRange
qRxLevMin , preambleInitialReceivedTargetPower
powerRampingStep (Hardcoded) , preambleTransMax (Hardcoded)
numberOfRA-Preambles (Hardcoded)
rachRootSequence , cellRange
qRxLevMin , preambleInitialReceivedTargetPower
powerRampingStep (Hardcoded) , preambleTransMax (Hardcoded)
numberOfRA-Preambles (Hardcoded)
MP load
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)
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)
pmRrcConnEstabFailHighLoad (MP load control)
pmRrcConnEstabFailOverload (procedure latency supervision)
pmActiveUeDlSum
pmActiveUeDlSectorCarrierDistr
pmActiveUeDlMax
pmActiveUeDlSumQci
pmActiveUeUlSum
pmActiveUeUlMax
pmActiveUeUlSectorCarrierDistr
pmActiveUeUlSumLcg
Capacity cause
pmRrcConnEstabFailActiveUserLicenseExceeded
License
Poor DL SINR (CQI)
pmRrcConnEstabFailFailureInRadioProcedure
Coverage issues
UL RSSI
RRC connection
pmRrcConnEstabAtt
(pmRrcConnEstabAttDta , pmRrcConnEstabAttEm
pmRrcConnEstabAttHpa , pmRrcConnEstabAttMod
pmRrcConnEstabAttMos , pmRrcConnEstabAttMta)
pmRrcConnEstabAttReatt
(pmRrcConnEstabAttReattDta , pmRrcConnEstabAttReattEm
pmRrcConnEstabAttReattHpa , pmRrcConnEstabAttReattMod
pmRrcConnEstabAttReattMos , pmRrcConnEstabAttReattMta)
pmRrcConnEstabSucc
(pmRrcConnEstabSuccDta , pmRrcConnEstabSuccEm
pmRrcConnEstabSuccHpa , pmRrcConnEstabSuccMod
pmRrcConnEstabSuccMos , pmRrcConnEstabSuccMta)
pmRrcConnReestFailLicMtReest
pmRadioRecInterferencePwr
pmRadioRecInterferencePwrPucch
pmRadioRecInterferencePwrPrb1~100
pmSinrPucchDistr , pmSinrPuschDistr
pZeroNominalPucch
pZeroNominalPusch
pmRrcConnEstabFailUnspecified
noOfPucchCqiUsers , noOfPucchSrUsers , pdcchCfiMode
tInactivityTimer , qRxLevMin , dlMaxRetxThreshold
ulMaxRetxThreshold , qOffsetcellEUtran
SchedulingAlgorithm , crsGain
pmPrbUtilDl
pmPrbUtilUl
pmRrcConnEstabFailMmeOvlMos
pmRrcConnEstabFailMmeOvlMod
Cell Down Auto
eNodeB Cause
pmCellDowntimeAuto
pmCellDownLockAuto
Cell Down Manually
Availability
Other checks
Sleeping Cell
Alarms
TN issue
Check Eutrancelltdd MO cell selection and reselection parameters & 3G&2G cell reselection parameter/feature
Check Cell Barred , acBarring for different scenarios
Check MME signalling dimensioning
Check S1 interface , S1 links down due to faulty interface board
Configure Correct TAC as per planning & ensure correct TAC LAC Mapping
Cell trace and check with Core Engineer
dlNonGbrRatio , dlTransNwBandwidth
Tune Dynamic GBR Admission Control related parameter
pmErabEstabFailGbrUlEnb
ulNonGbrRatio , ulTransNwBandwidth
Tune Dynamic GBR Admission Control related parameter
pmErabEstabFailAddedLic
pmErabEstabFailInitLic
pmErabModFailLic
Coverage issues
UL RSSI
Check license & Feature state of Multiple Radio Bearer per user or RLC UM
Check license & Feature state of Multiple Radio Bearer per user or RLC UM
Lack of license of Dynamic QoS Modification
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
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
Poor DL SINR (CQI)
ERAB ESTABLISHMENT
Check SectorEquipmentFunction:ConfiguredOutputPower & Eutrancelltdd:partOfSectorPower
Idle mode parameter issue
pmErabEstabFailGbrDlEnb
License
PmErabEstabAttInit
(pmErabEstabAttInitArp , pmErabEstabAttInitPa)
PmErabEstabSuccInit.
(pmErabEstabSuccInitArp , pmErabEstabSuccInitPa)
PmErabEstabAttAdded
(pmErabEstabAttAddedArp , pmErabEstabAttAddedPa)
PmErabEstabSuccAdded
(pmErabEstabSuccAddedArp , pmErabEstabSuccAddedPa)
pmErabEstabAttAddedHoOngoing
pmErabEstabAttAddedHoOngoingArp
Power setting issue
Cell Barred
TAC wrong configure & LAC-TAC mapping
CN abnormal release
PM Counter
Radio Cause
Operation Cause
Faulty TMA Connections & faulty settings
pmS1SigConnEstabFailMmeOvlMos
Other Checks
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..)
Configuration issues
Cell Down Auto
Cell down
pmCellDowntimeAuto
pmCellDownLockAuto
eNodeB Cause
Cell Down Manually
Availability
HW Cause
Sleeping Cell
pmCellDowntimeMan
pmCellDownLockMan
S1 issues
Operation Cause
trace from MSG1 to MSG5 , verify symtoms for sleeping cells
Power setting issue
Check SectorEquipmentFunction:ConfiguredOutputPower & Eutrancelltdd:partOfSectorPower
Idle mode parameter issue
Cell Barred
check for alarms like Service Unavailable(S1 connection failure)
manually locked during network configuration issues ((eg. adding/changing/removing hardware)
manually locked during parameter change (eg. activate feature)
Catch Trace(Baseband)
Configuration issue
Baseband Trace can be used , te enable all bbmcBbOmMeSwU
pmErabRelAbnormalEnbActTnFail
check for alarms like Service Unavailable(S1 connection failure) , Ip packet loss "above" SGW
Verify symtoms for sleeping cell
Operation issues
VSWR
ensure proper configuration , especially for all new site which are integrated recently
Ensure the eNodeB structure of the restart, MP、Baseband or RRU
lh all llog -l (do complete eNB health checkup)
pmRaAttCbra
pmRaSuccCbra
pmRaFailCbraMsg2Disc
pmRaAttCfra
pmRaSuccCfra
pmRaFailCfraMsg2Disc
pmRaAllocCfra
pmRrcConnEstabAtt
pmRrcConnSucc
Non-access issue
Alarms
Auto Restart
Baseband Startup issue
Transport Cause
EPC Cause
Other checks
check for alarms like Service Unavailable(S1 connection failure)
manually locked during network configuration issues ((eg. adding/changing/removing hardware)
manually locked during parameter change (eg. activate feature)
CABX , verify VSWR on all ports of antenna
TMA check
S1 SIGNALLING CONNECTION
Baseband Trace can be used , te enable all bbmcBbOmMeSwU
pmErabRelAbnormalEnbActTnFail
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.
HW Cause
VSWR
S1 issues
check for alarms like Service Unavailable(S1 connection failure) , Ip packet loss "above" SGW
trace from MSG1 to MSG5 , verify symtoms for sleeping cells
Operation issues
PmS1SigConnEstabAtt
(pmS1SigConnEstabAttHpa , pmS1SigConnEstabAttMod
pmS1SigConnEstabAttMta , pmS1SigConnEstabAttMos
pmS1SigConnEstabAttDta , pmS1SigConnEstabAttEm)
PmS1SigConnEstabSucc
(pmS1SigConnEstabSuccEm , pmS1SigConnEstabSuccHpa
pmS1SigConnEstabSuccMod , pmS1SigConnEstabSuccMta
pmS1SigConnEstabSuccMos , pmS1SigConnEstabSuccDta)
ensure proper configuration , especially for all new site which are integrated recently
Verify symptoms for sleeping cell
Configuration issue
Non-access issue
Action Plan
SRB admission control
Tune parameters mentioned aside
Physical changes (Tilt , Azimuth , height of antenna)
Tune cell reselection parameters
Ensure the eNodeB structure of the restart, MP、Baseband or RRU
lh all llog -l (do complete eNB health checkup)
Baseband Startup issue
pmCellDowntimeMan
pmCellDownLockMan
pmRaAttCbra
pmRaSuccCbra
pmRaFailCbraMsg2Disc
pmRaAttCfra
pmRaSuccCfra
pmRaFailCfraMsg2Disc
pmRaAllocCfra
pmRrcConnEstabAtt
pmRrcConnSucc
Trace(Baseband)
SSSR (Session setup sucess rate)
Counter
Auto Restart
Transport Cause
EPC Cause
Parameters
Tune parameters mentioned aside
Physical changes (Tilt , Azimuth , height of antenna)
Tune cell reselection parameters to offload traffic to nearby cells
Check parameters related to MME Overload Control feature & MME Dimensioning
Cell down
Legend
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..)
pdcchAdmThreshold , noOfPucchCqiUsers , noOfPucchSrUsers
pdcchCfiMode , tInactivityTimer , qRxLevMin
dlMaxRetxThreshold , ulMaxRetxThreshold
qOffsetcellEUtran , SchedulingAlgorithm , crsGain
PmPdcchCceUtil
Configuration issues
LTE KPI
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
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
Low number of attempt
Accessability
Tune related parameters (as mentioned beside) , Physical optimization (Tilt , Azimuth , height of antenna
Identify overshooting cells causing interference in DL , Audit cell reselection parameters
Mainly pegged due to eNB issues
pmRrcConnEstabFailBearerAdmissionRej
(SRB admission control)
MME overload
maximumTransmissionPower
partOfSectorPower
confOutputPower
crsGain
pdschTypeBGain
Upgrade license for number of connected users
Physical changes (Tilt , Azimuth , height of antenna)
Tune parameters as mentioned beside.
pegged due to lack of license of feature Multi-Target RRC Connection Reestablishment
pmRrcConnEstabFailLackOfResources
Other Causes
maximumTransmissionPower
partOfSectorPower
confOutputPower
crsGain
pdschTypeBGain
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
Tune parameters mentioned aside
Physical changes (Tilt , Azimuth , height of antenna)
Tune cell reselection parameters to offload traffic to nearby cells
noOfPucchCqiUsers , noOfPucchSrUsers , pdcchCfiMode
tInactivityTimer , dlMaxRetxThreshold , ulMaxRetxThreshold
qOffsetcellEUtran , qRxLevMin , SchedulingAlgorithm , crsGain
pmRadioUeRepCqiDistr , pmRadioUeRepCqiDistr2
pmBadCovEvalReport
pmRadioTbsPwrRestricted
pmBadCovSearchEvalReport
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 )
noOfPucchCqiUsers , noOfPucchSrUsers , pdcchCfiMode
tInactivityTimer , dlMaxRetxThreshold , ulMaxRetxThreshold
qOffsetcellEUtran , qRxLevMin , SchedulingAlgorithm , crsGain
pmLicConnectedUsersLicense , pmLicConnectedUsersTimeCong
pmLicConnectedUsersHardLimit , pmLicConnectedUsersActual
pmLicConnectedUsersDistr
pmRrcConnEstabFailLic
Radio Cause
pmRrcConnMax , pmRrcConnLevSum
pmProcessorCoreLoad , pmProcessorLoad
pmProcessorLoadDistr
Check Eutrancelltdd MO cell selection and reselection parameters & 3G&2G cell reselection parameter/feature
Check Cell Barred , acBarring for different scenarios
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.
CABX , verify VSWR on all ports of antenna
TMA check
Faulty TMA Connections & faulty settings
EGI-Network Engineering- LRAN
RETAINABILITY-L14B
UE Lost
pmErabRelAbnormalEnbActUeLos
(UE unreachable)
Radio Cause
Poor DL SINR (CQI)
Tune related parameters (as mentioned beside) , Audit cell reselection parameters
Physical optimization (Tilt , Azimuth , height of antenna) , also Identify overshooting cells causing interference in DL
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..)
pZeroNominalPucch
pZeroNominalPusch
Check HW issues , alarms , improper cabling , connector issues , DUS Board error
PCI confliction or confusion
Audit PCI of near by sites , also check if there is overshooting cell creating conflict
maximumTransmissionPower
partOfSectorPower
confOutputPower
crsGain
pdschTypeBGain
pmBadCovEvalReport
pmRadioTbsPwrRestricted
pmBadCovSearchEvalReport
Coverage issues
Poor DL SINR (CQI)
UL RSSI
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)
Check if there is scope of new site
maximumTransmissionPower
partOfSectorPower
confOutputPower
crsGain
pdschTypeBGain
pmRadioUeRepCqiDistr , pmRadioUeRepCqiDistr2
pmRadioRecInterferencePwr
pmRadioRecInterferencePwrPucch
pmRadioRecInterferencePwrPrb1~100
pmSinrPucchDistr , pmSinrPuschDistr
UL RSSI
HW and other causes
maximumTransmissionPower
partOfSectorPower
confOutputPower
crsGain
pdschTypeBGain
pmBadCovEvalReport
pmRadioTbsPwrRestricted
pmBadCovSearchEvalReport
Coverage issues
maximumTransmissionPower
partOfSectorPower
confOutputPower
crsGain
pdschTypeBGain
pmRadioUeRepCqiDistr , pmRadioUeRepCqiDistr2
pmRadioRecInterferencePwr
pmRadioRecInterferencePwrPucch
pmRadioRecInterferencePwrPrb1~100
pmSinrPucchDistr , pmSinrPuschDistr
Alarms
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)
Check if there is scope of new site
pZeroNominalPucch
pZeroNominalPusch
Tune related parameters (as mentioned beside) , Audit cell reselection parameters
Physical optimization (Tilt , Azimuth , height of antenna) also Identify overshooting cells causing interference in DL
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..)
Alarm need to monitor , some alarms need to monitor are VswrOverThreshold , Serviceunavailable (S1 connection failure) , Gigabit Ethernet Link Faul
Configuration issues
pmErabRelAbnormalEnbActHo
(handover execution failure)
pmCellDowntimeAuto
pmCellDownLockAuto
Cell Down Auto
Cell down
eNodeB Cause
Baseband Startup issue
Transport Cause
EPC Cause
pmCellDowntimeMan
pmCellDownLockMan
Cell Down Manually
HW issues & Alarms
Availability
Sleeping Cell
pmRaAttCbra
pmRaSuccCbra
pmRaFailCbraMsg2Disc
pmRaAttCfra
pmRaSuccCfra
pmRaFailCfraMsg2Disc
pmRaAllocCfra
pmRrcConnEstabAtt
pmRrcConnSucc
eNodeB Initiated
LTE KPI
Retainability
pmHoPrepRejInLicMob
License issue:
pmHoPrepRejInLicRlcUm
Legend:
Admission reject
Counters
Check SectorEquipmentFunction:ConfiguredOutputPower & Eutrancelltdd:partOfSectorPower
Idle mode parameter issue
Cell Barred
Check Eutrancelltdd MO cell selection and reselection parameters & 3G&2G cell reselection parameter/feature
Check Cell Barred , acBarring for different scenarios
Check "licenseCapacityConnectedUsers" of Target cell
Also Graceperiod should be noticed to exceed the licensed capacity limits for a limited periodof timeOffload traffic from target cel
Audit licenseState,featurestate,servicestate & other paramter related to MultiErabsPerUser feature
Audit licenseState,featurestate,servicestate & other paramter related to RlcUm feature
pmHoPrepRejInBearerAdmissionRej
Configuration issue
Parameter
Power setting issue
capacityUnitConnectedUsers
gracePeriodTimeLeft
Check these counters on target cell , Reduce no. of HO by physical opti or features (UE Level Oscillating Handover Minimization & Automated Mobility Optimization)
MP capacity of DUS is higher than DUL , to increase MP capacity DUL can be replaced by DUS
Physical changes (Tilt , Azimuth , height of antenna) to offload traffic from target cell
Offload Target cell Load by changing Layering strategy, Idle mode cellreselection, connected mode mobility & Load balancing parameters
pmHoPrepRejInHighLoad (MP load control)
pmHoPrepRejInOverload (procedure latency supervision)
Load:
Operation Cause
Audit licenseState,featurestate,servicestate & other paramter related to Intra freq & Inter freq HO feature
pmHoPrepRejInLicMultiErab
SARR(Session Abnormal Release Rate)
dlTransNwBandwidth , ulTransNwBandwidth
zzzTemp20 , zzzTemp21 , pmRrcConnMax , pmRrcConnLevSum
Configuration issues
Cell Down Auto
Cell down
pmErabRelAbnormalEnbActHpr
(handover preparation failure)
pmCellDowntimeAuto
pmCellDownLockAuto
Availability
Sleeping Cell
pmCellDowntimeMan
pmCellDownLockMan
pmRaAttCbra
pmRaSuccCbra
pmRaFailCbraMsg2Disc
pmRaAttCfra
pmRaSuccCfra
pmRaFailCfraMsg2Disc
pmRaAllocCfra
pmRrcConnEstabAtt
pmRrcConnSucc
Target cell
eNodeB Issue
Inter freq LTE
pmErabRelMmeActUnspecified
pmErabRelMmeActUserInactivity
Cell Barred
Check Eutrancelltdd MO cell selection and reselection parameters & 3G&2G cell reselection parameter/feature
Check Cell Barred , acBarring for different scenarios
If MME pool is different at source and target then HO-Preparation fail will be 100%, command "get . termpointmme" can be used to find out the MME pool IP
Target cell is prelaunch cell.(Primaryplmnreserved)
a5Threshold1RSRP ; a5Threshold2RSRP ; hysteresisA5 ; timeToTriggerA5 , a2TresholdRsrpPrim , ANR parameters
a1a2SearchThresholdRsrp ; hysteresisA1A2SearchRsrp ; timeToTriggerA2Search ; a2CriticalThresholdRsrp ; hysteresisA2CriticalRsrp ; timeToTriggerA2Critical
Check HW issues , alarms , improper cabling , connector issues , DUS Board error
Features
pmErabRelMme , pmErabRelMmeArp
pmErabRelMmeAct , pmErabRelMmeHo
pmErabRelMmeActHo , pmErabRelAbnormalMmeAct
pmErabRelAbnormalMMeActQci , pmErabRelAbnormalMMeActArp
pmErabRelMmeQci
Check SectorEquipmentFunction:ConfiguredOutputPower & Eutrancelltdd:partOfSectorPower
Idle mode parameter issue
S1 or X2 interfaces DOWN (Transport Resource Unavailable) , Also check 3G collocated nodeb in term of SCTP LOSS
Parameters
MME Initiated
Power setting issue
Check any planned activities , Check high temperature on DU,RU bord also Check eNodeb alarm logs , also it may be do to common transport network
Other important parameters/features
pmErabRelMmeActEutra
(Release due to Eutran generated reason)
Operation Cause
manually locked during network configuration issues ((eg. adding/changing/removing hardware)
manually locked during parameter change (eg. activate feature)
a2TresholdRsrpPrim ; hysteresisA2Prim ; timeToTriggerA2Prim ; b2Threshold1Rsrp ; b2Threshold2RscpUtra ; hysteresisB2 ; timeToTriggerB2
pmErabRelAbnormalEnbActTnFail
HW and other causes
check for alarms like Service Unavailable(S1 connection failure)
check for alarms like Service Unavailable(S1 connection failure) , Ip packet loss "above" SGW
cellIndividualOffsetEUtran ; a3offset ; hysteresisA3 ; timeToTriggerA3
MCPC feature para
pmErabRelAbnormalEnbActCd
Baseband Trace can be used , te enable all bbmcBbOmMeSwU
pmErabRelAbnormalEnbActTnFail
Check related alarms like Serviceunavailable (S1 connection failure,Hardware failure,GeneralHwError,GeneralSwError,Gigabit Ethernet Link Fault
MME pool
IRAT
S1 issues
trace from MSG1 to MSG5 , verify symtoms for sleeping cells
Configuration issue
Operation issues
Alarms
ensure proper configuration , especially for all new site which are integrated recently
Ensure the eNodeB structure of the restart, MP、Baseband or RRU
lh all llog -l (do complete eNB health checkup)
Verify symtoms for sleeping cell
Catch Trace(Baseband)
Non-access issue
Auto Restart
Baseband Startup issue
EPC Cause
Other checks
Transport nw Issue
eNodeB Cause
Transport Cause
Cell Down Manually
Tune HO related parameters
Audit UE Admission Control,Bearers (SRB & DRB) Admission Control,Transport Network Admission Control & Emergency call prioritization
Physical changes (Tilt , Azimuth , height of antenna) to offload traffic from target cell
Check configuration issues (especially after new site is integrated)
(check MO ExternalEUtranCellTDD,EUtranCellRelation,TermPointToENB,TermPointToMme)
(also check config para ex. Activeplmnlist,PCI , TAC , EutranFrequencyRef , IP address of TermPointToENB & MME)
Action plan
Intra LTE
check for alarms like Service Unavailable(S1 connection failure)
manually locked during network configuration issues ((eg. adding/changing/removing hardware)
manually locked during parameter change (eg. activate feature)
Check HW issues , alarms , improper cabling , connector issues , DUS Board error
pmHoPrepRejInLicConnUsers
Handover Failure
Baseband Trace can be used , te enable all bbmcBbOmMeSwU
pmErabRelAbnormalEnbActTnFail
trace from MSG1 to MSG5 , verify symtoms for sleeping cells
Configuration issue
Operation issues
HW issues
S1 issues
check for alarms like Service Unavailable(S1 connection failure) , Ip packet loss "above" SGW
Verify symtoms for sleeping cell
Catch Trace(Baseband)
Non-access issue
pmErabRelAbnormalEnb , pmErabRelAbnormalEnbQci
pmErabRelAbnormalEnbArp , pmErabRelNormalEnb
pmErabRelNormalEnbQci ,pmErabRelNormalEnbArp
mErabRelNormalEnbUserInactivity , pmErabRelNormalEnbAct
pmErabRelNormalEnbActArp , pmErabRelNormalEnbActQci
pmErabRelAbnormalEnbAct , pmErabRelNormalEnbUserInactivityQci
ensure proper configuration , especially for all new site which are integrated recently
Ensure the eNodeB structure of the restart, MP、Baseband or RRU
lh all llog -l (do complete eNB health checkup)
Auto Restart
RLC layer retransmissions
dlMaxRetxThreshold
ulMaxRetxThreshold
Multi-Target RRC Connection Re-Establishment
Mobility Control at Poor Coverage
If MME related issue is their many sites in the NW will be impacted & if Core related issues is there all sectors of site will be impacted.
If issue is in single sector then mostly it will be case of HW or radio related issues, Check HW issues , alarms , improper cabling , connector issues
Check Radio Condition (low coverage , UL_Pathloss, NOISE_PUSCH/PUCCH) (refer radio cases above) also Check Traffic Volume , also check if there is sudden spike in traffic)
Check if multi target RRC connection reestablishment feature is functioning properly.
Check is required on both Radio & core side
If MME related issue is their many sites in the NW will be impacted & if Core related issues is there all sectors of site will be impacted.
If issue is in single sector then mostly it will be case of HW or radio related issues (check following) , Check HW issues , alarms , improper cabling , connector issues
Check Radio Condition (low coverage , UL_Pathloss, NOISE_PUSCH/PUCCH) (refer radio cases above) also Check Traffic Volume , also check if there is sudden spike in traffic)
If there is no issue on eNB side , core team should troubleshoot the issue , Traces at core side can help to do RCA
Release due to long UE inactivity
EGI-Network Engineering- LRAN
MOBILITY-L14B
Neighbor cell load issue
pmHoPrepRejInHighLoad (MP load control)
pmHoPrepRejInOverload (procedure latency supervision)
pmHoPrepRejInLicMob
pmHoPrepRejInLicRlcUm
Audit licenseState,featurestate,servicestate & other paramter related to MultiErabsPerUser feature
Audit licenseState,featurestate,servicestate & other paramter related to RlcUm feature
capacityUnitConnectedUsers
gracePeriodTimeLeft
pmHoPrepRejInLicConnUsers
Admission reject
Handover Preparation Failure
pmHoPrepAttLTEIntraF
pmHoPrepSuccLTEIntraF
pmHoPrepAttLTEInterF
pmHoPrepSuccLTEInterF
Check "licenseCapacityConnectedUsers" of Target cell
Also Graceperiod should be noticed to exceed the licensed capacity limits for a limited periodof timeOffload traffic from target
cell
dlTransNwBandwidth , ulTransNwBandwidth
zzzTemp20 , zzzTemp21 , pmRrcConnMax , pmRrcConnLevSum
pmHoPrepRejInBearerAdmissionRej
Configuration issue
pmCellDowntimeAuto
pmCellDownLockAuto
Cell Down Auto
Availability
Cell down
eNodeB Cause
Cell Down Manually
Other checks
Equipment causes
HW/SW Cause
Alarms
Baseband Startup issue
UL RSSI
manually locked during network configuration issues ((eg. adding/changing/removing hardware)
manually locked during parameter change (eg. activate feature)
Operation Cause
Check alarms , hardware status , reset eNB if required
preparation failure will be high if there is SW package corrupt
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)
Check if there is scope of new site
maximumTransmissionPower , partOfSectorPower
confOutputPower , crsGain , pdschTypeBGain
pmRadioUeRepCqiDistr , pmRadioUeRepCqiDistr2
Tune related parameters (as mentioned beside) , Audit cell reselection parameters
Physical optimization (Tilt , Azimuth , height of antenna) also Identify overshooting cells causing interference in D
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..)
pZeroNominalPucch
pZeroNominalPusch
Alarm need to monitor , some alarms need to monitor are VswrOverThreshold , Serviceunavailable (S1 connection failure) , Gigabit Ethernet Link Fau
Mobility
Configuration issues
LTE KPI
Handover Execution Failure
Cell Down Auto
pmHoExeAttLTEIntraF
pmHoExeSuccLTEIntraF
pmHoExeAttLTEInterF
pmHoExeSuccLTEInterF
Legend:
Cell down
pmCellDowntimeAuto
pmCellDownLockAuto
Cell Down Manually
Availability
Counters
Configuration issue
Operation issues
HW issues
Target cell RACH issue
Wrong neighbour
Tune HO related parameters
Other imp checks
Transport nw Issue
EPC Cause
Inter-f load balancing
Session Continuity
MCPC
Intra LTE
Inter RAT Session continuity
pmCriticalBorderEvalReport
pmBadCovSearchEvalReport
Operation Cause
check for alarms like Service Unavailable(S1 connection failure
manually locked during network configuration issues ((eg. adding/changing/removing hardware)
manually locked during parameter change (eg. activate feature)
Verify symtoms for sleeping cell
trace from MSG1 to MSG5 , verify symtoms for sleeping cells
Power setting issue
Check SectorEquipmentFunction:ConfiguredOutputPower & EutrancellFDD:partOfSectorPower
Idle mode parameter issue
Cell Barred
Check EutrancellFDD MO cell selection and reselection parameters & 3G&2G cell reselection parameter/featur
Check Cell Barred , acBarring for different scenarios
preambleInitialReceivedTargetPower , cellrange
powerRampingStep (Hardcoded) , preambleTransMax (Hardcoded)
numberOfRA-Preambles (Hardcoded)
CM cross-check
Tune RACH related parameters , also check symptoms for sleeping cell (mentioned below)
Improve RF conditions (by parameters or physical optimization (tilt/azimuth/antenna height)
EUtranCellRelation
ExternalEUtranCellFDD
cellIndividualOffsetEUtran ; a3offset ; hysteresisA3 ; timeToTriggerA3 , isHoAllowed , filterCoefficientEUtraRsrp , sMeasure.
Inter freq LTE
a5Threshold1RSRP ; a5Threshold2RSRP ; hysteresisA5 ; timeToTriggerA5 , a2ThresholdRsrpPrim , timeToTriggerA2Prim , hysteresisA2Prim
Missing / Incorrect TA list , MME configuration check
pmUeCtxtRelSCEutra
a2ThresholdRsrpPrim ,hysteresisA2Prim ,
timeToTriggerA2Prim , a5B2MobilityTimer
Highload
RRC Connected user Traffic volume related counters
configuration
Check eNodeB configuration
Connected mode priority
Check eNodeB configuration
Coverage of target freq is poor , Tune parameters below to control SC
a2ThresholdRsrpPrim ,hysteresisA2Prim , timeToTriggerA2Prim ,
a5B2MobilityTimer
Coverage of target RAT is poor , Tune parameters below to control SC
a1a2SearchThresholdRsrp , hysteresisA1A2SearchRsrp , searchEffortTime
Tune parameters according to number of carriers in LTE
timeToTriggerA1Search , timeToTriggerA2Search , a2CriticalThresholdRsrp
hysteresisA2CriticalRsrp , timeToTriggerA2Critical , zzzTemporary13 , zzzTemporary14
Target Cell Availibility
Handover Preparation Failure
IRAT
Baseband Trace can be used , te enable all bbmcBbOmMeSwU
pmErabRelAbnormalEnbActTnFail
TN Outage / Flicker Alarm , S1 or X2 interfaces DOWN (Transport Resource Unavailable) , Also check 3G collocated nodeb in term of SCTP LOSS , TN & SGW alarm chec
MME configuration
pmUeCtxtRelSCWcdma
S1 issues
Check HW issues , alarms , improper cabling , connector issues , DUS Board error
pmRaAttCfra , pmRaSuccCfra
qciSubscriptionQuanta , lbThreshold , lbCeiling , hysteresisA5
pmHoExeAttLteInterFLb , pmHoExeSuccLteInterFLb
cellSubscriptionCapacity , a5Threshold1Rsrp ,
pmHoPrepAttLteInterFLb , pmHoPrepSuccLteInterFLb
a5Threshold2Rsrp
LTE Inter Frequency Session Continuity
Baseband Startup issue
pmCellDowntimeMan
pmCellDownLockMan
Catch Trace(Baseband)
ensure proper configuration , especially for all new site which are integrated recently
Ensure the eNodeB structure of the restart, MP、Baseband or RRU
lh all llog -l (do complete eNB health checkup)
check for alarms like Service Unavailable(S1 connection failure) , Ip packet loss "above" SGW
pmRaAttCbra , pmRaSuccCbra , pmRaFailCbraMsg2Disc
pmRaAttCfra , pmRaSuccCfra , pmRaFailCfraMsg2Disc
pmRaAllocCfra , pmRrcConnEstabAtt , pmRrcConnSucc
Non-access issue
Parameter
Auto Restart
Transport Cause
Sleeping Cell
Action plan
eNodeB Cause
EPC Cause
HW issues & Alarms
check for alarms like Service Unavailable(S1 connection failure
Audit PCI of near by sites , also check if there is overshooting cell creating conflict , OSS PCI conflicting functio
pmRadioRecInterferencePwr
pmRadioRecInterferencePwrPucch
pmRadioRecInterferencePwrPrb1~100
pmSinrPucchDistr , pmSinrPuschDistr
Alarms
Baseband Trace can be used , te enable all bbmcBbOmMeSwU
pmErabRelAbnormalEnbActTnFail
If MME pool is different at source and target then HO-Preparation fail will be 100%, command "get . termpointmme" can be used to find out the MME pool IP
pmBadCovEvalReport
pmRadioTbsPwrRestricted
pmBadCovSearchEvalReport
Poor DL SINR (CQI)
S1 issues
check for alarms like Service Unavailable(S1 connection failure) , Ip packet loss "above" SGW
Check HW issues , alarms , improper cabling , connector issues , DUS Board error
SW package
PCI confliction or confusion
pmCellDowntimeMan
pmCellDownLockMan
RRU Issue / Antenna Issue
ensure proper configuration , especially for all new site which are integrated recently
Ensure the eNodeB structure of the restart, MP、Baseband or RRU
lh all llog -l (do complete eNB health checkup)
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.
Check related alarms like Serviceunavailable (S1 connection failure,Hardware failure,GeneralHwError,GeneralSwError,Gigabit Ethernet Link Fault)
HW issues
MME pool
Auto Restart
Transport Cause
EPC Cause
Coverage issues
Audit UE Admission Control,Bearers (SRB & DRB) Admission Control,Transport Network Admission Control & Emergency ca
prioritization
Physical changes (Tilt , Azimuth , height of antenna) to offload traffic from target cell
Check configuration issues (especially after new site is integrated)
(check MO ExternalEUtranCellFDD,EUtranCellRelation,TermPointToENB,TermPointToMme)
(also check config para ex. Activeplmnlist,PCI , TAC , EutranFrequencyRef , IP address of TermPointToENB & MME
Configuration issues
LTE Intra/Inter Frequency(HOSR)
Check these counters on target cell , Reduce no. of HO by physical opti or features (UE Level Oscillating Handover
Minimization & Automated Mobility Optimization)
MP capacity of DUS is higher than DUL , to increase MP capacity DUL can be replaced by DUS
Physical changes (Tilt , Azimuth , height of antenna) to offload traffic from target cell
Offload Target cell Load by changing Layering strategy, Idle mode cellreselection, connected mode mobility & Load
balancing parameters
Audit licenseState,featurestate,servicestate & other paramter related to Intra freq HO feature
pmHoPrepRejInLicMultiErab
Neighbor cell License issue
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 )
noOfPucchCqiUsers , noOfPucchSrUsers , pdcchCfiMode
pmHoPrepAtt
pmHoPrepSucc
IRAT Handover(HOSR)
b2Threshold1Rsrp , b2Threshold2RscpUtra ,
hysteresisB2 , timeToTriggerB2 , triggerQuantityB2
a2ThresholdRsrpPrim ,hysteresisA2Prim
timeToTriggerA2Prim , a5B2MobilityTimer
configuration issue
EPC Cause
Handover Execution Failure
pmHoExeAtt
pmHoExeSucc
b2Threshold1Rsrp , b2Threshold2RscpUtra ,
hysteresisB2 , timeToTriggerB2 , triggerQuantityB2
a2ThresholdRsrpPrim ,hysteresisA2Prim
timeToTriggerA2Prim , a5B2MobilityTimer
Check EPC configuration
Target cell load
Check load & admission control parameter of legacy network
Tune parameters
HW issues
Poor Coverage
target site is disabled / sector down / software package corrupt
Frequency relation (UtranFreqRelation) , neighbor relation (ExternalUtrancell)
Audit beside mentioned parameters for IRAT HO
Check HW issues , alarms , improper cabling , connector issues , VSWR
Check target cell Coverage area (legacy network)
Target cell High UL interference
Wrong neighbour
HW issues
Check interference issues in target cell
Check configuration parameter of neighbor cell
Check HW issues , alarms , improper cabling , connector issues , VSWR
EGI-Network Engineering- LRAN
INTEGRITY-L14B
transmission Mode , pdcchCfiMode , dlChannelBandwidth
ulChannelBandwidth , noOfTxAntennas , noOfRxAntenna
Transmission Mode
pmBadCovEvalReport , pmRadioTbsPwrRestricted
pmBadCovSearchEvalReport
Poor Coverage
Poor DL SINR (CQI
pmRadioUeRepCqiDistr , pmRadioUeRepCqiDistr
pmRadioRecInterferencePwr
pmRadioRecInterferencePwrPucch
pmRadioRecInterferencePwrPrb1~10
pmSinrPucchDistr , pmSinrPuschDistr
UL RSSI
Radio Cause
CCE Allocation/CFI mode
check if there is lack CCE for DL assignment
pmMacHarqDlAckQpsk , pmMacHarqDlAck16qam , pmMacHarqDlAck64qam
pmMacHarqDlNackQpsk , pmMacHarqDlNack16qam , pmMacHarqDlNack64qa
pmRlcArqDlNack , pmRlcArqDlAc
dlMaxRetxThreshold
pmRadioTxRankDistr
DL modulation ratio
pmMacHarqDlAckQpsk , pmMacHarqDlAck16qam , pmMacHarqDlAck64qa
noOfUsedTxAntenna , noOfRxAntennas , TM confi
pmSchedActivityCellDl , pmSchedActivityUeDl , pmActiveDrbDlSum
1 - SIMO ; 2 - MIMO ; high samples should be of rank 2
SchedulingAlgorithm
tInactivityTimer , dlChannelBandwidth , pdcchCfiMode
qOffsetcellEUtran , qRxLevMin , noOfPucchCqiUsers
noOfPucchSrUsers , pdcchCfiMode , SchedulingAlgorithm
Proportional Fair High/ Medium/ Low and Resource Fai
Dl Throughput would reduce with increase in number of connected users , High PRB and PDCCH utilization would impact the DL Throughpu
Traffic offload to less utilized neighboring cells , Reduce control channel resources(Before that check PDCCH utilization)
Add BW (if system is operating < 20Mhz) as BW increase would increase number of PRB , Reduce inactivity timer (tInactivityTimer)
pmPrbUtilDl
pmRrcConnMax
Important features
Channel Bandwidth , 64-QAM DL , MIMO ; for UL - interference rejection combining , Ul frequency selective scheduling
dlchannelBW
Frame Config
TM config
eNB configurations
noOfUsedTxAntenna , noOfRxAntennas
TM2/TM3/TM7/TM8
CFI config
pdcchcfimode
RF power
Verify parameter settings are correct
d&ulMaxHARQTx , tPeriodicBSR&PHRTimer , tTimeAlignmentTim
RLC config
retrans and poll timer
Server settings
Verify parameter settings are correct
Verify parameter settings are correct
Verify parameter settings are correct
FTP/UDP server configuration ; Iperf (UDP&TCP) (employ 1360 not 1470 to prevent fregmentation
end user PC setting
UE CATEGORY/SUBSCRIPTION
Verify parameter settings are correct
Verify parameter settings are correct
onfigoutputpower , maxtransmissionpower , partofradiopower , Pa Pb settin
MAC config
Drive test setup/settings
Verify parameter settings are correct
subframeAssignment , frameStartOffset , specialSubframePattern
No. of Tx antenna
Laptop processor , memory etc. can impact THP ; MTU setting in PC (bigger to prevent fregmentation) ; TCP setting (TCP windows size, etc)
UE subscription defined in EPC and USIM
Alarms
Alarm need to monitor , some alarms need to monitor are VswrOverThreshold , Serviceunavailable (S1 connection failure) , Gigabit Ethernet Link Fau
Configuration issues
eNodeB Cause
pmCellDowntimeAuto
pmCellDownLockAuto
Cell Down Auto
Cell down
HW issues & Alarms
Sleeping Cell
Operation issues
HW issues
Transport Network setting
Power Headroom
pZeroNominalPusch
maximumTransmissionPower , partOfSectorPowe
confOutputPower , crsGain , pdschTypeBGain
pZeroNominalPucch
pZeroNominalPusch
pmSchedActivityCellUl , pmSchedActivityUeUl , pmActiveDrbUlSum
SchedulingAlgorithm
ulChannelBandwidth , noOfPucchCqiUsers , noOfPucchSrUsers
SchedulingAlgorithm , tInactivityTimer , qOffsetcellEUtran , qRxLevM
Channel Bandwidth , 16-QAM UL , interference rejection combining , Ul frequency selective scheduling
ulchannelBW
RLC config
Drive test setup/settings
Verify parameter settings are correct
subframeAssignment , frameStartOffset , specialSubframePattern
Power control
MAC config
p0norminalPUSCH , p0norminalPUCCH
Verify parameter settings are correct
d&ulMaxHARQTx , tPeriodicBSR&PHRTimer , tTimeAlignmentTim
retrans and poll timer
Server settings
Verify parameter settings are correct
Verify parameter settings are correct
FTP/UDP server configuration ; Iperf (UDP&TCP) (employ 1360 not 1470 to prevent fregmentation
end user PC setting
UE CATEGORY/SUBSCRIPTION
Proportional Fair High/ Medium/ Low and Resource Fai
High PRB utilization would impact the UL Throughput , Traffic offload to less utilized neighboring cells
Add Bandwidth (if system is operating < 20Mhz) as Bandwidth increase would increase number of PRB , Reduce inactivity timer (tInactivityTime
Important features
eNB configurations
Laptop processor , memory etc. can impact THP ; MTU setting in PC (bigger to prevent fregmentation) ; TCP setting (TCP windows size, etc)
UE subscription defined in EPC and USIM
Alarms
Alarm need to monitor , some alarms need to monitor are VswrOverThreshold , Serviceunavailable (S1 connection failure) , Gigabit Ethernet Link Fau
Configuration issues
Cell Down Auto
Cell down
eNodeB Cause
pmCellDowntimeAuto
pmCellDownLockAuto
Cell Down Manually
Availability
Sleeping Cell
Non-access issue
pmCellDowntimeMan
pmCellDownLockMan
Configuration issue
Operation issues
HW issues
pmPdcpLatTimeDl
pmPdcpLatPktTransDl
UE Trace
Latency
C-Plane Latency
Baseband Trace can be used , te enable all bbmcBbOmMeSwU
pmErabRelAbnormalEnbActTnFai
check for alarms like Service Unavailable(S1 connection failure)
Operation Cause
manually locked during network configuration issues ((eg. adding/changing/removing hardware
manually locked during parameter change (eg. activate feature)
Verify symtoms for sleeping cell
trace from MSG1 to MSG5 , verify symtoms for sleeping cells
Power setting issue
Check SectorEquipmentFunction:ConfiguredOutputPower & Eutrancelltdd:partOfSectorPower
Idle mode parameter issue
Cell Barred
Check Eutrancelltdd MO cell selection and reselection parameters & 3G&2G cell reselection parameter/feature
Check Cell Barred , acBarring for different scenarios
Check HW issues , alarms , improper cabling , connector issues , DUS Board erro
Check TN BW capacity ,check IUB CAPACITY ALLOCATION trend also on 3G colocate ; Check MTU size setting (bigger size to prevent fregmentation)
DU GE port setting - actualspeedduplex (if half- duplex, it could be problem of auto-negotiation) ; dscpPbitMap (Qos mapping from L3 to L2)
TN packet discard/loss - Check MO ipaccesshostet, ipinterface, gigabitethernet etc. counter ; Can use Iperf to check the transport BW
UE processing time(1.5ms) ; TTI duration(1ms)
HARQ retransmission(0~0.8ms) ; eNodeB processing(1.5ms
Random Access delay
Wait for RACH scheduling(0.5ms) ; Preamble(1ms)
eNodeB processing and grand(3ms) ; UE processing(5ms
RRC Signalling
"RRC Connection Request" to "RRC Connection Setup Complete
NAS Signalling
"Attach Request" to "Attach Complete"
Radio Cause
Packet loss
S1 issues
check for alarms like Service Unavailable(S1 connection failure) , Ip packet loss "above" SGW
check HSS user subscription and default QoS profile ; PCRF Dynamic QoS profile
PGW enforce APN-AMBR , UE-AMBR and bearer-AMBR ; SGW handle DL data buffer and forwarding
Transport Network setting
U-Plane Latency
ensure proper configuration , especially for all new site which are integrated recently
Ensure the eNodeB structure of the restart, MP、Baseband or RRU
lh all llog -l (do complete eNB health checkup)
Baseband Startup issue
pmRaAttCbra , pmRaSuccCbra , pmRaFailCbraMsg2Disc
pmRaAttCfra , pmRaSuccCfra , pmRaFailCfraMsg2Disc
pmRaAllocCfra , pmRrcConnEstabAtt , pmRrcConnSucc
Catch Trace(Baseband)
EPC Setting
Auto Restart
Transport Cause
EPC Cause
HW issues & Alarms
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) ; at last Check if there is scope of new site
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..)
pmPrbUtilUl
Frame Config
pmUeThpVolUl , pmUeThpTimeU
pmSchedActivityCellUl
PDCCH carries both the UL (PUSCH) assignment and DL (PDSCH) assignment.
If many PDCCH CCEs are used for DL transmission (e.g. SIB with 8 CCEs) it may be that UL grant is not possible to be scheduled in this TTI for a single UE
Other imp counters
RF BW
UL Throughput
Check Eutrancelltdd MO cell selection and reselection parameters & 3G&2G cell reselection parameter/feature
Check Cell Barred , acBarring for different scenarios
pmMacHarqUlSuccQpsk/PmMacHarqUlSucc16qam
Scheduling algorithm
Action plan
Cell Barred
pZeroNominalPusch too low , can cause to transmitt low power
pmRadioRecInterferencePwr
pmRadioRecInterferencePwrPucch
pmRadioRecInterferencePwrPrb1~10
pmSinrPucchDistr , pmSinrPuschDistr
UL modulation ratio
Parameter
Check SectorEquipmentFunction:ConfiguredOutputPower & Eutrancelltdd:partOfSectorPower
Idle mode parameter issue
Power Headroom values less than 0 can be considered the UE is power limited , When a UE is power limited, the eNB may schedule fewer PRBs to reduce the required output power of the UE, which reduce throughpu
pZeroNominalPusch too high causing UE to exceed maximum transmit power (tune parameter)
pmBadCovEvalReport , pmRadioTbsPwrRestricted
pmBadCovSearchEvalReport
Poor Coverage
Counters
Power setting issue
Check TN BW capacity ,check IUB CAPACITY ALLOCATION trend also on 3G colocate ; Check MTU size setting (bigger size to prevent fregmentation)
DU GE port setting - actualspeedduplex (if half- duplex, it could be problem of auto-negotiation) ; dscpPbitMap (Qos mapping from L3 to L2)
TN packet discard/loss - Check MO ipaccesshostet, ipinterface, gigabitethernet etc. counter ; Can use Iperf to check the transport BW
PDCCH SIB scheduling colliding with UL gran
UL RSSI
Verify symtoms for sleeping cell
Check HW issues , alarms , improper cabling , connector issues , DUS Board erro
pZeroNominalPusch
rxPower too low
Legend:
manually locked during network configuration issues ((eg. adding/changing/removing hardware
manually locked during parameter change (eg. activate feature)
Operation Cause
Buffer Status Report (BSR) is used to inform eNB of data waiting for transmission in the UE
If low/No data is waiting for transmission UL throughput will be low ; also Low values indicate UE/laptop problem
Buffer Status
Radio Cause
check for alarms like Service Unavailable(S1 connection failure)
check HSS user subscription and default QoS profile ; PCRF Dynamic QoS profile
PGW enforce APN-AMBR , UE-AMBR and bearer-AMBR ; SGW handle DL data buffer and forwarding
EPC Setting
LTE KPI
Baseband Trace can be used , te enable all bbmcBbOmMeSwU
pmErabRelAbnormalEnbActTnFai
trace from MSG1 to MSG5 , verify symtoms for sleeping cells
Configuration issue
Non-access issue
S1 issues
check for alarms like Service Unavailable(S1 connection failure) , Ip packet loss "above" SGW
pmRaAttCbra , pmRaSuccCbra , pmRaFailCbraMsg2Disc
pmRaAttCfra , pmRaSuccCfra , pmRaFailCfraMsg2Disc
pmRaAllocCfra , pmRrcConnEstabAtt , pmRrcConnSucc
Catch Trace(Baseband)
ensure proper configuration , especially for all new site which are integrated recently
Ensure the eNodeB structure of the restart, MP、Baseband or RRU
lh all llog -l (do complete eNB health checkup)
Baseband Startup issue
pmCellDowntimeMan
pmCellDownLockMan
Cell Down Manually
Availability
Throughput
Auto Restart
Transport Cause
EPC Cause
Integrity
NACK ratio should be low
NACK ratio should be low
Other imp counters
RF BW
DL Throughput
ACK_SN should be increasing, otherwise RLC buffers are not released
NACK_SN indicates RLC retransmissions (occasionally is OK)
dlMaxRetxThreshold
Rank Indicator (RI)
Scheduling algorithm
pmPdcpVolDlDrb , pmUeThpTimeDl
pmPdcpVolDlDrbLastTti , pmSchedActivityCellD
pmPdcpVolDlDrbQci , pmPdcpVolDlSrb
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)
pmPdcchCceUtil , pmPdcchCfiUtil , pdcchcfimode
RLC retransmission
Tune related parameters (as mentioned beside) , Audit cell reselection parameters
Physical optimization (Tilt , Azimuth , height of antenna) also Identify overshooting cells causing interference
If UE is sending with high CQI(in the range 10-15) and RI=2 but Throughput is still very low, then check assignable bits
High MCS but low number of PRBs (under many users cases , so that more users can be scheduled)
pmRlcArqDlAck , pmRlcArqDlNac
pmRlcArqUlAck , pmRlcArqUlNac
HARQ retransmission
Retransmission
Indoor coverage issue (Small cell , PICO , DOT , Hetnet) ; Physical changes (Tilt , Azimuth , height of antenna)
Audit cell reselection parameters , Tune DL power related parameters ; Check if there is scope of new site
maximumTransmissionPower , partOfSectorPowe
confOutputPower , crsGain , pdschTypeBGain
pZeroNominalPucch
pZeroNominalPusch
pmPrbUtilDl
Low assignable bits
(data in DL buffer to schedule UE)
Check noOfUsedTxAntennas , transmissionMode (TM2/TM3/TM7 selection) & SC125 to confirm the Transmission Mode
Check featurestateDualAntDlPerfPkg
maximumTransmissionPower , partOfSectorPowe
confOutputPower , crsGain , pdschTypeBGain
EPC Cause
DL Packet Loss Rate
pmPdcpPktDiscDlPelr , pmPdcpPktDiscDlPelrUu
pmPdcpPktDiscDlHo , pmPdcpPktReceivedDl , pmPdcpPktFwd
UL Packet Loss Rate
pmPdcpPktLostUl
pmPdcpPktReceivedUl
RRC Connection Setup delay
RRC request(1ms) ; eNodeB processing(4ms)
RRC setup(1ms) ; UE processing(12ms) ; RRC setup complete(1ms
UE processing(16ms) ; eNodeB processing(4ms
NAS service and process delay
Parallel processing of NAS request at eNodeB+MME(0ms) ; NAS setup(1.5ms
Packet Forwarding at S1 Handover feature can help to reduce DL packet loss
eNodeB trace need to be analysed for detailed analysis
Wireshark analysis need to be done for detailed analysis
Wireshark analysis need to be done for detailed analysis
eNodeB trace need to be analysed for detailed analysis
EGI-Network Engineering- LRAN