Admission PM CountersCheck PM statistics for the busiest hours
because early RRC rejects normally happens when there is a lack of
resources and/or congestion in the UtranCell. The early RRC
rejection is triggered when the late RRC connection Reject Ratio is
higher than zero. When admission to the question cell is denied to
a UE, the admission may be denied due to, for example, - Power, -
Code utilization, - ASE, or - Compressed mode limit being reached,
or - ack of uplink hardware resources. For example: If
pmNoRrcReqDeniedAdmDlChnlCode shows a very high peg counts the
early RRC rejection is triggered because the admission mechanism
already knows there is a high number of RRC Connection Requests
denied by admission control due to lack of DL Channelisation Codes.
In this situation, there is a need to increase the number of DL
channel codes value set in the License Key File as well as the
number of DL codes set in the nodeB (maxNumHsPdschCodes and
licenseCapacityNumHsPdschCodes). If your early rejection is
triggered by DL power congestion, check if pmNoRrcReqDeniedAdmDlPwr
peg counts is high. If it is, you may have to check your pwrAdm
parameter value with respect to maximumTransmissionPower and
maxDlPowerCapability. pwrAdm is admission limit for downlink cell
carrier power. Expressed relative to the lower of
maximumTransmissionPower (configured in this UtranCell instance)
and maxDlPowerCapability (configured in the corresponding instance
of RbsLocalCell in the RBS).If it happens that the DL channel codes
are more than enough then you may have to consider upgrading the
power output of your RU. There are other causes that can trigger
this for your case and would require thorough investigation. In our
case, when we encountered the RNC-wide early RRC reject alarm
involving multiple nodeBs (about 50-70 percent); we increased both
the UL and DL baseband pool capacity. This corrective action cost a
lot of money for CAPEX to implement. The following PM counters
should be checked in order to find out exactly which resources are
causing the early rejections: pmNoEulHardHoReturnOldChTarget
pmNoFailedAfterAdm pmNoFailedRabEstAttemptExceedConnLimit
pmNoFailedRabEstAttemptLackDlAse
pmNoFailedRabEstAttemptLackDlChnlCode
pmNoFailedRabEstAttemptLackDlHw pmNoFailedRabEstAttemptLackDlHwBest
pmNoFailedRabEstAttemptLackDlPwr pmNoFailedRabEstAttemptLackUlAse
pmNoFailedRabEstAttemptLackUlHw pmNoFailedRabEstAttemptLackUlHwBest
pmNoFailedRrcConnectReqCsHw pmNoFailedRrcConnectReqHw
pmNoFailedRrcConnectReqPsHw pmNoOfNonHoReqDeniedCs
pmNoOfNonHoReqDeniedEul pmNoOfNonHoReqDeniedHs
pmNoOfNonHoReqDeniedInteractive pmNoOfNonHoReqDeniedPsStr128
pmNoOfNonHoReqDeniedPsStreaming pmNoOfNonHoReqDeniedSpeech
pmNoOfSwDownNgAdm pmNoReqDeniedAdm pmNoRlDeniedAdm
pmNoRrcCsReqDeniedAdm pmNoRrcPsReqDeniedAdm pmNoRrcReqDeniedAdm
pmNoRrcReqDeniedAdmDlChnlCode pmNoRrcReqDeniedAdmDlHw
pmNoRrcReqDeniedAdmDlPwr pmNoRrcReqDeniedAdmUlHw
pmNoServingCellReqDeniedEul pmNoServingCellReqDeniedEulTti2 You can
also check the RRC settings in the RNC: RncFeatureId RrcLoadControl
featureState 1 (ACTIVATED) isLicenseControlled 1 (TRUE) keyId
CXC4030104 licenseState 1 (ENABLED) serviceState 1 (OPERABLE) RrcId
1 rncMaxDatMarginCallReest 50 rrcConnSetupTime 7 rrcLcFilterDecr 10
rrcLcFilterDecrThresh 5 rrcLcFilterIncr 10 rrcLcFilterIncrThresh 15
rrcLcFilterMax 80 rrcLcMonitorPeriod 5 rrcLcRrcReqMin 8 ...And the
Utrancell settings: aseDlAdm aseUlAdm dlCodeAdm sf128Adm sf16Adm
sf32Adm sf8Adm srbAdmExempt
