METHOD AND APPARATUS FOR HANDLING STATE VARIABLES FOR SECURITY DURING HANDOVER PROCEDURE IN WIRELESS COMMUNICATION SYSTEM

WIPO Patent Application WO/2021/201404

A1

The present invention relates to a method of performing a handover procedure by a user equipment (UE) in a wireless communication system. Especially, the method includes the steps of receiving a handover command containing information about at least one COUNT value from a first network; establishing a first Packet Data Convergence Protocol (PDCP) entity associated with a second network while maintaining a second PDCP entity associated with the first network; performing a random access procedure with the second network; and based on a handover failure with the second network being detected, transmitting a message for informing the handover failure to the first network with setting at least one state variable for the first PDCP entity according to the at least one COUNT value.

WO/2006/055939	MAINTAINING CONSISTENT NETWORK CONNECTIONS WHILE MOVING THROUGH WIRELESS NETWORKS
WO/2022/111113	FREQUENCY CHANNEL SWITCHING METHOD, TERMINAL, BASE STATION, AND STORAGE MEDIUM
JPWO2003015356	Communication methods and communication systems in servers, mobile communication terminals, wireless devices and communication systems

JO GEUMSAN (KR)
CHO HEEJEONG (KR)

PCT/KR2021/001182

October 07, 2021

January 29, 2021

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LG ELECTRONICS INC (KR)

H04W36/00

US20190166531A1	2019-05-30
US20200022032A1	2020-01-16

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ERICSSON: "DAPS handover without key change", 3GPP DRAFT; R2-2000126, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG2, no. Elbonia; 20200224 - 20200306, 13 February 2020 (2020-02-13), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP051848489
SAMSUNG: "Leftover issues on DAPS PDCP", 3GPP DRAFT; R2-2000738, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG2, no. e-Meeting; 20200224 - 20200306, 14 February 2020 (2020-02-14), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP051849311

KBK & ASSOCIATES (KR)

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