Section: 6.5.3.5 Abnormal cases in the UE
Content: The following abnormal cases can be identified: a) Expiry of timer T3480: On the first expiry of the timer T3480, the UE shall resend the BEARER RESOURCE ALLOCATION REQUEST and shall reset and restart timer T3480. This retransmission is repeated four times, i.e. on the fifth expiry of timer T3480, the UE shall abort the procedure, release the PTI allocated for this activation and enter the state PROCEDURE TRANSACTION INACTIVE. b) Unknown EPS bearer context Upon receipt of the BEARER RESOURCE ALLOCATION REJECT message including ESM cause #43 "invalid EPS bearer identity", the UE shall deactivate the existing default EPS bearer context locally without peer-to-peer signalling between the UE and the MME and shall stop the timer T3480. c) Collision of a UE requested bearer resource allocation procedure and an EPS bearer context deactivation procedure. When the UE receives a DEACTIVATE EPS BEARER CONTEXT REQUEST message for the default EPS bearer context related to the UE requested bearer resource allocation procedure, the UE shall abort the UE requested bearer resource allocation procedure and shall stop the timer T3480 and proceed with the EPS bearer context deactivation procedure.