Section: 5.4.2.6 Abnormal cases in the UE
Content: The following abnormal cases can be identified: a) Transmission failure of SECURITY MODE COMPLETE message or SECURITY MODE REJECT message indication from lower layers (if the security mode control procedure is triggered by a registration procedure). The UE shall abort the security mode control procedure and re-initiate the registration procedure. b) Transmission failure of SECURITY MODE COMPLETE message or SECURITY MODE REJECT message indication with change in the current TAI (if the security mode control procedure is triggered by a service request procedure). If the current TAI is not in the TAI list, the security mode control procedure shall be aborted and a registration procedure shall be initiated. If the current TAI is still part of the TAI list, the security mode control procedure shall be aborted and it is up to the UE implementation how to re-run the ongoing procedure that triggered the security mode control procedure. c) Transmission failure of SECURITY MODE COMPLETE message or SECURITY MODE REJECT message indication without change in the current TAI (if the security mode control procedure is triggered by a service request procedure). The security mode control procedure shall be aborted and it is up to the UE implementation how to re-run the ongoing procedure that triggered the security mode control procedure.