LTE: Bearer Resource Allocation Reject

·        If the bearer resource allocation request cannot be accepted by the network, then the MME sends a BEARER RESOURCE ALLOCATION REJECT message to the UE.

·        The BEARER RESOURCE ALLOCATION REJECT message shall contain the Procedure Transaction Identity (PTI) which is equal to the PTI value in the BEARER RESOURCE ALLOCATION REQUEST received from the UE

·        This message shall also contain an ESM Cause value indicating the reason for rejecting the UE requested bearer resource allocation.

·        The UE, after receiving the BEARER RESOURCE ALLOCATION REJECT message, shall stop the timer T3480 and release the traffic flow aggregate description associated to the received PTI value

·        If the ESM cause value is #26 "insufficient resources", the network may include a value for timer T3396 value IE in the BEARER RESOURCE ALLOCATION REJECT message. Depending on the timer value, the UE shall take different actions as explained in 6.5.3.4 in 3GPP TS 24.301

Reference 3GPP TS 24.301

Example:  BEARER RESOURCE ALLOCATION REJECT message