公开(公告)号：US20220345949A1

公开(公告)日：2022-10-27

申请号：US17753378

申请日：2020-09-08

Applicant: LG ELECTRONICS INC.

Inventor： Myungjune YOUN ,  Sehee LEE ,  Sungduck CHUN ,  Hyunsook KIM ,  Laeyoung KIM ,  Sangmin PARK

IPC: H04W36/00 ,  H04W36/32 ,  H04L65/1016 ,  H04L65/1069

Abstract: Provided in one embodiment of the present specification is a method for user equipment (UE) for an Internet protocol multimedia subsystem (IMS) voice session. The method can comprise the steps of: establishing an EMS voice session by using a non 3GPP interworking function (N3IWF) or an enhanced packet data gateway (ePDG) through non-3rd generation partnership project (3GPP) access; determining that voice is not supported on a current NG-RAN on the basis of that the UE must moves the IMS voice session to a 3GPP access; and handing over a protocol data unit (PDU) session for the IMS voice session of the non-3GPP access to an evolved packet core (EPC) of the 3GPP access on the basis of the determination.