L.E-RAB.FailEst.MME what could be the possible reason for that.
1.Transport layer and radio network layer problems.
2.No resources available at enodeB(Congestion)
3.N o response from the UE.
4.Faults on the MME side
5.Security mode configuration failure
These are the main reasons…for RAB failures…4&5 both are main reasons
Your always welcome