Patent ID: 11902338
Assignee: LG ELECTRONICS INC.
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method for performing communication related to a Multi Access (MA) Packet Data Unit (PDU) session, the method performed by a network node and comprising:
receiving a Session Initiation Protocol (SIP) registration message including MA PDU session information from a User Equipment (UE),
wherein the MA PDU session information includes first information that the UE performs an Internet Protocol Multimedia Subsystem (IMS) service through the MA PDU session, which is established via both of 3rd generation partnership project (3GPP) access and non-3GPP access;
transmitting the SIP registration message to an Application Server (AS);
performing IMS registration procedure for the MA PDU session;
receiving a SIP invite message related to the IMS service for the MA PDU session from the AS; and
based on the received MA PDU session information, transmitting second information on whether the IMS service for the SIP invite message is included in Packet Data (PS) Data Off exempt service to a Policy Control Function (PCF) node,
wherein the second information enables the PCF node to update a Policy and Charging Control (PCC) rule,
wherein the updated PCC rule includes a steering mode of the PCC rule for the IMS service being configured to Active Standby based on active access being non-3GPP access and standby access being not configured, based on that the IMS service is not included in the PS Data Off exempt service, and
wherein the 3GPP PS Data Off prevents traffic via the 3GPP access except for traffic related to the 3GPP PS Data Off Exempt service, when the 3GPP PS Data Off is activated.