US 12,245,087 B2
Method and apparatus for performing cell access without random access in next generation wireless communication system
June Hwang, Gyeonggi-do (KR); Soenghun Kim, Gyeonggi-do (KR); and Himke Van Der Velde, Gyeonggi-do (KR)
Assigned to Samsung Electronics Co., Ltd., (KR)
Appl. No. 17/427,789
Filed by Samsung Electronics Co., Ltd., Gyeonggi-do (KR)
PCT Filed Feb. 14, 2020, PCT No. PCT/KR2020/002095
§ 371(c)(1), (2) Date Aug. 2, 2021,
PCT Pub. No. WO2020/167016, PCT Pub. Date Aug. 20, 2020.
Claims priority of application No. 10-2019-0017188 (KR), filed on Feb. 14, 2019.
Prior Publication US 2022/0132380 A1, Apr. 28, 2022
Int. Cl. H04W 36/00 (2009.01); H04W 72/044 (2023.01); H04W 72/23 (2023.01)
CPC H04W 36/0077 (2013.01) [H04W 36/00725 (2023.05); H04W 72/044 (2013.01); H04W 72/23 (2023.01)] 8 Claims
OG exemplary drawing
 
1. A method performed by a terminal in a wireless communication system, the method comprising:
receiving, from a source base station, a first radio resource control (RRC) message for a random access channel (RACH)-less handover (HO), wherein the first RRC message includes first information for the RACH-less HO and at least one bandwidth part (BWP) configuration information including second information;
performing an uplink transmission for the RACH-less HO using a configured uplink grant for the RACH-less HO of a specific BWP identified based on a configuration associated with the at least one BWP among the at least one BWP;
in case that the first information is included in the first RRC message and lower layers report the RACH-less HO is successfully completed, stopping a timer; and
based on the stopped the timer, releasing the configured uplink grant for the RACH-less HO of the specific BWP in case that the first information is included in the first RRC message and the configuration is configured,
wherein the first information comprises target timing advance (TA) information.