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

Claim 0:
1. A method of a terminal in a wireless communication system, the method comprising:
generating by an application layer of the terminal, a mobile originating (MO) Internet protocol (IP) multimedia subsystem (IMS) registration-related IMS signal (MO-IMS-registration-related IMS signal), generated in the terminal;
mapping, by a non-access stratum (NAS) layer of the terminal, access category information corresponding to the MO-IMS-registration-related IMS signal among a plurality of access attempt types;
transmitting the mapped access category information, by the NAS layer of the terminal to an AS layer of the terminal;
determining by the AS layer of the terminal, to allow access in case that the mapped access category information is 9 indicating an access attempt type for the MO-IMS-registration-related IMS signal;
receiving 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;
identifying that the 5GMM cause value included in the reject message is 22, the 22 indicating that the mobility and periodic registration update is not accepted by the network due to a network congestion; and
in case that the registration procedure for the mobility and periodic registration update, upon request for the MO-IMS-registration-related IMS signal generated from the application layer of the terminal, is initiated and the registration procedure is not allowed by the network, delivering, by the NAS layer of the terminal to the application layer of the terminal, a notification indicating that the registration procedure has not been initiated due to network congestion based on the identified 5GMM cause value.