Question: What happens if a UE experiences transmission failure of the GUTI REALLOCATION COMPLETE message with a TAI change, and the current TAI is not in the TAI list?
Option 1: The UE will re-run the ongoing procedure that triggered the GUTI reallocation procedure.
Option 2: The UE will initiate a new GUTI reallocation procedure.
Option 3: The UE will ignore the transmission failure and continue with normal operation.
Option 4: The UE shall abort the GUTI reallocation procedure and initiate a tracking area updating procedure.
Explanation: According to the specified abnormal case, if the current TAI is not in the TAI list after a transmission failure of the GUTI REALLOCATION COMPLETE message with a TAI change, the UE must abort the GUTI reallocation procedure and initiate a tracking area updating procedure. This ensures that the UE updates its location information to maintain network connectivity.