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
