How to improve the "L.E-RAB.FailEst.SecurModeFail"?

How to improve the “L.E-RAB.FailEst.SecurModeFail”?
Vendor Huawei

Is it EPC related issue?

No, it’s not.

Issue is due EPC or UE with same TMSI or capability failure or eNodeB license expiration.
Check also uumsgsimulsendswitch and seccmpwaitingtimer.

UuMsgSimulSendSwitch ON

UuMessageWaitingTimer Then we need to check this para?

Indicates the timer for the eNodeB to wait for a Security Mode Complete message. If the UuMsgSimulSendSwitch is set to ON, this parameter does not take effect and the timer for the eNodeB to wait for a Security Mode Complete message is specified by the UuMessageWaitingTimer parameter.