Section: 6.3.1.2.3 Abnormal cases on the network side
Content: The following abnormal cases can be identified: a) T3590 expired. The SMF shall, on the first expiry of the timer T3590, retransmit the PDU SESSION AUTHENTICATION COMMAND message and shall reset and start timer T3590. This retransmission is repeated four times, i.e. on the fifth expiry of timer T3590, the SMF shall abort the procedure. b) Collision of UE-requested PDU session release procedure and a PDU session authentication and authorization procedure. When the SMF receives a PDU SESSION RELEASE REQUEST message during the PDU session authentication and authorization procedure, and the PDU session indicated in the PDU SESSION RELEASE REQUEST message is the PDU session that the SMF had requested to authenticate, the SMF shall abort the PDU session authentication and authorization procedure and proceed with the UE-requested PDU session release procedure.