LTE RRC Connection Reject Message

According to the 3GPP TS 36.331 , RRC CONNECTION REJECT message is used to reject the RRC connection establishment. This message includes the IE waitTime which can be in the range from 0 to 16 seconds. Optionally, the NW can include the IE extendedWaitTime for the purpose of Delay Tolerant access requests

          Upon receiving the RRC CONNECTION REJECT message, the UE should start timer T302, with the timer value set to waitTime. The UE is not allowed to send another RRCConnectionRequest for mobile originating calls, mobile originating signalling, mobile terminating access and mobile originating CS fallback on the same cell on which RRC CONNECTION REJECT is received until the expiry of T302

 The following differences are noted as compared to UMTS RRC CONNECTION REJECT:

1.             There is no RejectionCause in the case of LTE

2.             RedirectionInfo which is used to redirect the UE to another frequency/RAT is not present in the case of LTE

3.             LTE requires the higher layers to initiate new RRC CONNECTION REJECT after receiving RRC CONNECTION REJECT, where as in the case of UMTS, the procedure is repeated for N300 times