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1. (WO2017018662) PDN CONNECTION ESTABLISHMENT METHOD AND USER EQUIPMENT

Pub. No.:    WO/2017/018662    International Application No.:    PCT/KR2016/006522
Publication Date: Fri Feb 03 00:59:59 CET 2017 International Filing Date: Tue Jun 21 01:59:59 CEST 2016
IPC: H04W 76/02
H04W 24/04
H04W 80/10
H04L 29/06
Applicants: LG ELECTRONICS INC.
엘지전자 주식회사
Inventors: KIM, Hyunsook
김현숙
RYU, Jinsook
류진숙
KIM, Laeyoung
김래영
YOUN, Myungjune
윤명준
KIM, Dongsoo
김동수
Title: PDN CONNECTION ESTABLISHMENT METHOD AND USER EQUIPMENT
Abstract:
A disclosure of the present specification provides a method for establishing a packer data network (PDN) connection by a user equipment (UE). The method may comprise the steps of: transmitting a session initiation protocol (SIP)-based request message for requesting sending of a voice over LTE (VoLTE) call through a first type PDN connection; receiving, from a network node, a message including information directly or indirectly indicating that there is a problem in the first type PDN connection, instead of a normal response message to the SIP-based request message; determining to change the PDN type from the first type to a second type, on the basis of the information in the received message; and transmitting, to a mobility management entity (MME), a PDN connection request message including information on the changed second type.