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1. (WO2018084635) METHOD FOR MOVING FROM NGS TO EPS IN WIRELESS COMMUNICATION SYSTEM AND APPARATUS THEREFOR

Pub. No.:    WO/2018/084635    International Application No.:    PCT/KR2017/012409
Publication Date: Sat May 12 01:59:59 CEST 2018 International Filing Date: Sat Nov 04 00:59:59 CET 2017
IPC: H04W 36/00
H04W 36/14
H04W 76/04
Applicants: LG ELECTRONICS INC.
엘지전자 주식회사
Inventors: KIM, Laeyoung
김래영
KIM, Taehun
김태훈
Title: METHOD FOR MOVING FROM NGS TO EPS IN WIRELESS COMMUNICATION SYSTEM AND APPARATUS THEREFOR
Abstract:
A method for moving user equipment (UE) from a next generation system (NGS) to an evolved packet system (EPS) in a wireless communication system comprises: by the UE, a step of determining to move to the EPS; and a step of transmitting a radio resource control (RRC) connection request and an attach request to the EPS. In the method for moving from the NGS to the EPS, if the UE has an ongoing voice call when determining to move to the EPS, the UE maintains the ongoing voice call by performing at least one of an access class barring (ACB) execution or a transmission of ongoing voice call related information by using "ongoing voice call" call type information.