Patent ID: 11968614
Assignee: MEDIATEK SINGAPORE PTE. LTD.
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A User Equipment (UE), comprising:
a wireless transceiver, configured to perform wireless transmission and reception to and from one or both of a 3rd Generation Partnership Project (3GPP) access network and a non-3GPP access network; and
a controller, configured to obtain information indicating that the UE is not allowed to access a 3GPP core network over the non-3GPP access network, and access the 3GPP core network over the 3GPP access network based on the obtained information;
wherein the controller is further configured to perform the following in response to the 3GPP core network being a 5G Core Network (5GCN) and the information indicating that the UE is not allowed to access the 3GPP core network over the non-3GPP access network:
setting a 5GS update status to “5U3 ROAMING NOT ALLOWED”; and
deleting a 5G Globally Unique Temporary UE Identity (GUTI), a last visited registered Tracking Area Identity (TAI), a TAI list, and a Key Set Identifier for Next Generation Radio Access Network (ngKSI);
wherein the information is obtained from a response message of a registration procedure or a configuration update command received from the 3GPP core network, or from subscription data stored in the UE.