US 11,743,971 B2
Method and system for maintaining service continuity by user equipment (UE) in wireless communication system
Lalith Kumar, Bangalore (IN); Danish Ehsan Hashmi, Bangalore (IN); Kailash Kumar Jha, Bangalore (IN); Alok Kumar Jangid, Bangalore (IN); and Govind Irappa Uttur, Bangalore (IN)
Assigned to Samsung Electronics Co., Ltd
Filed by Samsung Electronics Co., Ltd., Gyeonggi-do (KR)
Filed on Aug. 16, 2021, as Appl. No. 17/403,281.
Application 17/403,281 is a continuation of application No. 16/622,725, granted, now 11,096,245, previously published as PCT/KR2018/012121, filed on Oct. 15, 2018.
Claims priority of application No. 201741036546 (IN), filed on Oct. 13, 2017; and application No. 201842038766 (IN), filed on Oct. 12, 2018.
Prior Publication US 2021/0378056 A1, Dec. 2, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. H04W 88/06 (2009.01); H04W 36/00 (2009.01); H04W 36/14 (2009.01); H04W 48/18 (2009.01); H04W 60/00 (2009.01)
CPC H04W 88/06 (2013.01) [H04W 36/0022 (2013.01); H04W 36/14 (2013.01); H04W 48/18 (2013.01); H04W 60/005 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A method performed by a user equipment (UE) for maintaining service continuity in a wireless communication system, the method comprising:
transmitting a registration request message or a tracking area update (TAU) message to a management entity of a first radio access technology (RAT) network, when the UE is registered in the first RAT network and a second RAT network;
receiving, from the management entity, a registration reject message or a TAU reject message; and
transmitting, to the management entity, a registration message for initial registration or an attach request message including a registration status information of the UE of the second RAT network,
wherein the registration status information of the UE of the second RAT network comprises at least one of Evolved Packet System (EPS) Mobility Management, (EMM) registration status information, or 5th Generation Mobility Management (5GMM) registration status information.