Periodic registration update procedure for non-allowed service areas

A user equipment (UE), comprising:

• a transceiver configured to communicate with a fifth generation (5G) network;
• and
• a processor communicatively coupled to the transceiver and configured to perform operations comprising:
• initiating the periodic registration update timer, wherein the UE is configured to perform a periodic registration update procedure in response to a periodic update timer expiry event;
• identifying that the periodic update timer has expired, wherein the periodic update timer expiry event occurs when the UE is out of coverage;
• selecting a cell to camp on, wherein the cell is known to be in a non-allowed area;
• and
• initiating the periodic registration update procedure in response to the periodic update timer expiry event, wherein the UE delays the periodic registration update procedure until the UE enters a 5G mobility management (5GMM) operating substate associated with camping on the cell that is known to be in the non-allowed area, wherein the 5GMM operating substate is 5GMM-REGISTERED.NON-ALLOWED-SERVICE.

A method, comprising:

• at a user equipment (UE):
• initiating a periodic timer, wherein the UE is configured to perform a periodic registration update procedure in response to a periodic update timer expiry event;
• identifying that the periodic update timer has expired, wherein the periodic update timer expiry event occurs when the UE is out of coverage;
• selecting a cell to camp on, wherein the cell is known to be in a non-allowed area;
• and
• initiating the periodic registration update procedure in response to the periodic update timer expiry event, wherein the UE delays the periodic registration update procedure until the UE enters a fifth generation mobility management (5GMM) operating substate associated with camping on the cell that has the TAI that is known to be in the non-allowed area, wherein the 5GMM operating substate is 5GMM-REGISTERED.NON-ALLOWED-SERVICE.