Question: What should a User Equipment (UE) do when it receives a SERVICE-LEVEL AUTHENTICATION COMMAND message during a UE-requested PDU session release procedure, and the indicated PDU session is the one being released?
Option 1: The UE should abort the PDU session release procedure and respond to the SERVICE-LEVEL AUTHENTICATION COMMAND message.
Option 2: The UE should ignore the SERVICE-LEVEL AUTHENTICATION COMMAND message but pause the PDU session release procedure until further instruction.
Option 3: The UE should send an error message to the network indicating a collision of procedures.
Option 4: The UE should ignore the SERVICE-LEVEL AUTHENTICATION COMMAND message and proceed with the UE-requested PDU session release procedure.
Explanation: According to the specified abnormal case handling, when a UE receives a SERVICE-LEVEL AUTHENTICATION COMMAND message during its own requested PDU session release procedure for the same PDU session indicated in the command, it should ignore the authentication command and continue with releasing the PDU session as originally intended. This ensures that the UE's request is prioritized and processed without interruption from conflicting network requests.