US 11,877,322 B2
Method and apparatus for random access preamble group selection in wireless communication system
Anil Agiwal, Suwon-si (KR); and Jaehyuk Jang, Suwon-si (KR)
Assigned to Samsung Electronics Co., Ltd., Suwon-si (KR)
Appl. No. 17/309,852
Filed by Samsung Electronics Co., Ltd., Suwon-si (KR)
PCT Filed Jan. 29, 2021, PCT No. PCT/KR2021/001252
§ 371(c)(1), (2) Date Jun. 23, 2021,
PCT Pub. No. WO2021/157969, PCT Pub. Date Aug. 12, 2021.
Claims priority of provisional application 62/971,464, filed on Feb. 7, 2020.
Prior Publication US 2022/0272758 A1, Aug. 25, 2022
Int. Cl. H04W 74/08 (2009.01)
CPC H04W 74/0833 (2013.01) 14 Claims
OG exemplary drawing
 
1. A method performed by a terminal in a wireless communication system, the method comprising:
receiving, from a base station, information on a maximum number of message A preamble transmissions;
identifying that a preamble transmission counter value for a 2-step random access procedure equals a value identified based on the information on the maximum number of message A preamble transmissions;
identifying a random access type from 2-step to 4-step;
identifying whether a first random access preambles group was selected during the 2-step random access procedure;
selecting a second random access preambles group for a contention-based 4-step random access procedure based on a message A configuration for the 2-step random access procedure, in case that the first random access preambles group was not selected during the 2-step random access procedure;
selecting the same first random access preambles group for the contention-based 4-step random access procedure, in case that the first random access preambles group was selected during the 2-step random access procedure; and
performing a random access preamble transmission for the contention-based 4-step random access procedure based on the selected random access preambles group.