What are main RRC counters, failure causes and solution in LTE?

This article is about RRC counters used to find RRC failures (LTE), Failure Causes and Solution. After, we discussed one by one RF optimization possible solutions of RRC Setup Failure Measurement and what actions can be taken by RF 4G optimization engineer.

RRC counters, failure causes and solution in LTE

Counter NameFailure CauseSolution
L.RRC.SetupFail.ResFailResource allocation failures.Check RRC Connected user and remaining Resource (PUCCH,SRS and PRB Utilization). Increase connected user license or configure parameter mentioned below.
L.RRC.SetupFail.ResFail.SRSSRS resource allocation failures.The SrsSubframeRecfSwitch option of SrsAlgoSwitch
L.RRC.SetupFail.ResFail.PUCCHPUCCH resource allocation failures.The SriPeriodAdaptive option of PUCCHcfg be selected
L.RRC.SetupFail.ResFail.UserSpeclimitation of UE number specification.Check Active UE utilization / Load balancing (Intra-Inter)/ upgrade board (UBBPe6/9) which support more UE.
Check UE Specific issue
L.RRC.SetupFail.ResFail.OtherOther resource allocation failures.
L.RRC.SetupFail.ResFail.CellBarredcell is barred.Disable Cell Barred if configuration mismatch / Disable Service completely / redirect service to low loaded or legacy network.
L.RRC.SetupFail.NoReplyNo responses from the UE.Poor RF Coverage and UL RSSI/ Adjust QRxLevMin /SmartPreAllocationSwitch
/SrbProbeSchSwitch
L.RRC.SetupFail.RejRRC Connection Reject messages sent to UEs in a cell.Main counter for all the cause
L.RRC.SetupFail.Rej.MMEOverloadMME overload.Raise with Core
L.RRC.SetupFail.Rej.OtherOther causes.
L.RRC.SetupFail.Rej.ForbidAcUE access beyond the cell radius.Check TA and Restrick coverage within cell range by adjusting power or Tilt
L.RRC.SetupFail.Rej.MMEOverload.RxOverloadIndeNodeB receives MME overload indications.Raise with Core
L.RRC.ConnReq.Msg.disc.FlowCtrlRRC Connection Request message is discarded due to flow control.Timer 300 and Timer 302
L.RRC.SetupFail.Rej.FlowCtrlThe eNodeB sends an RRC Connection Reject message to the UE due to flow control.
L.RRC.ConnReq.Msg.disc.IllegalRRC Connection Request messages are discarded because the messages are illegal.UE Issue / High UL RSSI / Timer 302

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