US 12,262,252 B2
Method and apparatus for performing handover procedure in wireless communication system
Donggun Kim, Suwon-si (KR); and Soenghun Kim, Suwon-si (KR)
Assigned to Samsung Electronics Co., Ltd., Suwon-si (KR)
Appl. No. 17/766,058
Filed by Samsung Electronics Co., Ltd., Suwon-si (KR)
PCT Filed Sep. 29, 2020, PCT No. PCT/KR2020/013359
§ 371(c)(1), (2) Date Apr. 1, 2022,
PCT Pub. No. WO2021/066532, PCT Pub. Date Apr. 8, 2021.
Claims priority of application No. 10-2019-0122659 (KR), filed on Oct. 2, 2019; and application No. 10-2019-0138766 (KR), filed on Nov. 1, 2019.
Prior Publication US 2022/0369171 A1, Nov. 17, 2022
Int. Cl. H04W 36/00 (2009.01); H04W 36/08 (2009.01); H04W 36/18 (2009.01); H04W 36/30 (2009.01)
CPC H04W 36/0011 (2013.01) [H04W 36/08 (2013.01); H04W 36/185 (2023.05); H04W 36/302 (2023.05)] 16 Claims
OG exemplary drawing
 
1. A method performed by a user equipment (UE) in a wireless communication system, the method comprising:
receiving, from a source base station, a message including reconfiguration with sync;
starting a first timer;
in case that a dual active protocol stack (DAPS) bearer is configured based on the message, establishing a radio link control (RLC) entity for a target base station and suspending a signaling radio bearer (SRB) for the source base station;
in case that the first timer expires and a radio link between the UE and the source base station is active, releasing the RLC entity for the target base station, resuming the suspended SRB for the source base station, and transmitting a DAPS handover failure report to the source base station; and
in case that the first timer expires and the radio link between the UE and the source base station is not active, performing a radio resource control (RRC) re-establishment procedure.