	US 12,238,600 B2
	IRAT RRC re-establishment procedure and IRAT resume procedure
Mangesh Abhimanyu Ingale, Bangalore (IN); and Fasil Abdul Latheef, Bangalore (IN)
Assigned to Samsung Electronics Co., Ltd., Suwon-si (KR)
Appl. No. 17/310,956
Filed by Samsung Electronics Co., Ltd., Suwon-si (KR)
PCT Filed Mar. 2, 2020, PCT No. PCT/KR2020/002966 § 371(c)(1), (2) Date Sep. 1, 2021, PCT Pub. No. WO2020/180071, PCT Pub. Date Sep. 10, 2020.
Claims priority of application No. 201941008171 (IN), filed on Mar. 1, 2019; and application No. 201941008171 (IN), filed on Feb. 26, 2020.
Prior Publication US 2023/0145867 A1, May 11, 2023
Int. Cl. H04W 36/30 (2009.01); H04W 76/19 (2018.01); H04W 36/14 (2009.01)

CPC H04W 36/305 (2018.08) [H04W 76/19 (2018.02); H04W 36/1443 (2023.05)]

13 Claims

1. A method performed by a user equipment (UE), for handling a radio link failure (RLF) in a wireless communication system, the method comprising:

detecting the RLF at the UE associated with a first cell in the wireless communication system, wherein the first cell is associated with a first Radio Access Technology (RAT);

selecting a second cell in the wireless communication system by performing a cell selection procedure in response to detecting the RLF at the UE associated with the first cell in the wireless communication system, wherein the second cell is associated with a second RAT;

detecting that a fifth generation core (5GC) is connected;

determining that a timer is running, in the UE, on the second RAT; and

in response to determining that the timer is running in the UE on the second RAT, performing an Inter Radio Access Technology (IRAT) Radio Resource Control (RRC) re-establishment procedure on the second cell when the RLF is occurred on the first cell associated with the first RAT,

wherein the UE inherits a remaining value of the timer, on the second cell, from the first cell, and wherein the timer is configured and started on the first RAT.