138198983 accessibility analysis walkthroughf
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Accessibility AnalysisAccessibility AnalysisAccessibility AnalysisAccessibility Analysis
WalkthroughWalkthroughWalkthroughWalkthrough
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Accessibility failures due
to lack of UL/DL HW
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› Counters:› RRC blockings due to lack of HW:
› pmNoFailedConnectReqHw
› pmNoFailedConnectReqCsHw › pmNoFailedRrcConnectReqPsHw
› pmNoRrcReqDeniedAdmUlHw
› pmNoRrcReqDeniedAdmDlHw
› RAB blockings due to lack of HW:› pmNoFailedRabEstAttemptLackUlHw
› pmNoFailedRabEstAttemptLackDlHw
Blockings due to lack of HW
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› Increasing the UL CE license› Increase the license UL CE if HW is available
› If HW is not available, Add RAXB and Upgrade the license
› In case there is no plan to upgrade the license or to performHW expansion, many parameters can be tuned
› Reduce the parameters Sf4AdmUl and Sf8AdmUl
› Reduce the eulServingCellUsersAdmTti2 since EUL TTI2msusers are very greedy in UL CE (8 CEs are reserved wih ladder)
› ulHwAdm can be increased from 95% to 99% to reduce
blockings
UL CE blockings
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› Increase the license DL CE› Increase the license DL CE if HW is available
› If HW is not available
› Add TXB and Upgrade the license› In case TXB can not be added, Free one HS resource ID inorder to free 128 available CE and then Upgrade the license
› In case there is no plan to upgrade the license, manyparameters can be tuned
› Reduce the parameters Sf8Adm and Sf16Adm
› dlHwAdm can be increased from 95% to 99% to reduceblockings
DL CE blockings
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Accessibility failures due
to lack of DL power
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› Counters:
› RRC blockings due to lack of DL Power:› pmNoRrcReqDeniedAdmDlPwr
› RAB blockings due to lack of DL Power:
› pmNoFailedRabEstAttemptLackDlPwr
Blockings due to lack of DL power
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› Audit the parameters maxDlPowerCapability (MO:RbsLocalCell, Node: RBS) andmaximumTransmissionPower (MO: UtranCell, Node: RNC) to
check if there is any inconsistency
› CPICH power can be slightly reduced to free power for traffic(from 330 to 320)
› pwrAdm can be increased from 75 to 85
› Reduce sf8Adm in order to reduce the number of DL PS
RAB384 which are more power consuming than other RABs
Blockings due to lack of DL power
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Accessibility failures due
to lack of codes
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› Counters:
› RRC blockings due to lack of DL Channelization Codes:› pmNoRrcReqDeniedAdmDlChnlCode
› RAB blockings due to lack of DL Channelization Codes:
› pmNoFailedRabEstAttemptLackDlChnlCode
Blockings due to lack of DL Codes
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› Reduce the parameter numHsPdschCodes from 5 to (4 or3) in order to free codes from the tree
› dlCodeAdm can be increased from 70 to 85
› Reduce sf8Adm in order to free codes from the tree
› 2nd
carrier expansion
› New site
Blockings due to lack of DL codes
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Accessibility failures due
toUL/DL ASE
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› Counters:› RAB blockings due to lack of ASE:
› pmNoFailedRabEstAttemptLackUlAse
› pmNoFailedRabEstAttemptLackDlAse
› Increase aseDlAdm. Other Radio resources (DL Power and Codes)should be closely monitored to detect any congestion
› Increase aseUlAdm. UL RSSI should be closely monitored
Blockings due to lack of ASE
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Accessibility failures due
to Exceed Connection Limit
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› Counters:› RAB blockings due Exceed Conn limit:
› pmNoFailedRabEstAttemptExceedConnLimit
› The counter defines the number of failed PS RAB failed due to exceedingthe configured connection limit when allocating a specific SF code
› Counter is stepped when admission control fails with reject reason valueof SF4, SF8, SF16 or SF32
› Increase the parameters sf4Adm, sf8Adm, sf16Adm and sf32Adm (MO:UtranCell, Node: RNC) in order to reduce the blockings. This is not
recommended since this will be impacting other KPIs such as blockingsdue to DL codes and power
Blockings due to exceed conn limit
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Accessibility failures
due to Node
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› Counters:
› pmNoRrcConnReqBlockNodePs
› pmNoRrcConnReqBlockNodeCs
› pmNoRabEstBlockNodeSpeechBest
› pmNoRabEstBlockNodeCs57Best
› pmNoRabEstBlockNodeCs64Best
› pmNoRabEstBlkNodePsIntNonHsBest
› pmNoRabEstBlkTnPsStrNonHsBest
› pmNoRabEstBlkNodePsIntHsBest
› pmNoRabEstBlkNodePsStrHsBest
› Check if there any parameter misconfiguration
For example: hsdpaUsersAdm configured higher than maxNumHsdpaUsers
› Check if there is any faulty HW or hanging boards
Blockings due to Node
RRC
RAB
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Accessibility failures
due to TN
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› Counters:
› pmNoRrcConnReqBlockTnPs
› pmNoRrcConnReqBlockTnCs
› pmNoRabEstBlockTnSpeech
› pmNoRabEstBlockTnCs57
› pmNoRabEstBlockTnCs64
› pmNoRabEstBlockTnPsIntNonHs
› pmNoRabEstBlockTnPsIntNonHs
› pmNoRabEstBlockTnPsIntHs
› pmNoRabEstBlockTnPsStreamHs
› Check for Iub congestion
› Check for any misconfiguration on the Iub or Link Intermittent
Blockings due to TN
RRC
RAB
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HS blockings due to
number of HSDPAusers
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› Counter: pmNoOfNonHoReqDeniedHs
› Two parameters to be audited:
› hsdpaUsersAdm (MO: Utrancell, Node: RNC)
› maxNumHsdpaUsers (MO: RbsLocalCell, Node: RBS)
› Ideally speaking, hsdpaUsersAdm should be equal to 75% ofmaxNumHsdpaUsers. The 25% difference is used as mobility margin (HS cell
change) and reduces the risk for HS drops
› maxNumHsdpaUsers is directly related to licenseCapacityNumHsdpaUsers
› If maxNumHsdpaUsers = licenseCapacityNumHsdpaUsers› hsdpaUsersAdm can be increased to 90-95% of maxNumHsdpaUsers (1)
› If blockings are not solved using (1), IncreaselicenseCapacityNumHsdpaUsers, maxNumHsdpaUsers andhsdpaUsersAdm
HSDPA RAB blockings due to HS users limit
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EUL blockings due to
number of EUL users
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› Counter: pmNoOfNonHoReqDeniedEul
› Parameters to be audited:
› eulServingCellUsersAdm (MO: Utrancell, Node: RNC)
› eulNonServingCellUsersAdm (MO: Utrancell, Node: RNC)› eulServingCellUsersAdmTti2 (MO: Utrancell, Node: RNC)
› maxNumEulUsers (MO: RbsLocalCell, Node: RBS)
› maxNumEulUsers is directly related to licenseCapacityNumEulUsers
› Parameter eulNonServingCellUsersAdm can be set to limit a large number ofEUL users in soft/softer handover
› If maxNumEulUsers = licenseCapacityNumEulUsers
› eulServingCellUsersAdm can be increased to reach maxNumEulUsers (1)
› If blockings are not solved using (1), IncreaselicenseCapacityNumEulUsers, maxNumEulUsers and
eulServingCellUsersAdm
EUL RAB blockings due to EUL users limit
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Failures After
Admission
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› Counter: pmNoFailedAfterAdmBy definition, the counter defines the number of RRC or RAB failed after
being admitted by admission control
› The reasons of failures after admission are many:
› Iub congestion
› Wrong parameter settings (ex: parameters related to admission are higheron RNC than the RBS capability, ulHwAdm/dlHwAdm = 100, etc.)
› Coverage issues
› Pilot Pollution› Faulty HW
› Hanging Boards
› Transmission issues
› High UL RSSI› etc
› Failures after admission should be analyzed case by case to identify the
reason behind these failures and take the necessary actions accordingly
Failures After Admission
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