Patent ID: 11943733
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 6:
7. A terminal in a wireless communication system, the terminal comprising:
a transceiver; and
a controller configured to:
control an application layer of the terminal to generate a mobile originating (MO) Internet protocol (IP) multimedia subsystem (IMS) registration-related IMS signal (MO-IMS-registration-related IMS signal), generated in the terminal;
control a non-access stratum (NAS) layer of the terminal to map access category information to an access attempt type of the MO-IMS-registration-related IMS signal;
control the transceiver to transmit the access category information mapped to the access attempt type from the NAS layer of the terminal to an AS layer of the terminal;
control the AS layer of the terminal to determine to allow access for the access attempt type in case that the access category information mapped to the access attempt type is 9;
control the transceiver to receive a reject message including a 5GS mobility management (5GMM) cause value, in case that a registration procedure for a mobility and periodic registration update is initiated and the mobility and periodic registration update is not allowed by a network;
identify that the 5GMM cause value included in the reject message is 22; and
in case that the registration procedure for the mobility and periodic registration update is for a request for the MO-IMS-registration-related IMS signal mapped to the access category information 9, control the NAS layer of the terminal to deliver to the application layer of the terminal, a notification indicating that the registration procedure has not been initiated due to network congestion.