US 12,004,226 B2
Method and apparatus for switching between 2 step and 4 step random access (RA) procedures and contention resolutions
Anil Agiwal, Suwon-si (KR); Jaehyuk Jang, Suwon-si (KR); and Soenghun Kim, Suwon-si (KR)
Assigned to Samsung Electronics Co., Ltd., Suwon-si (KR)
Filed by Samsung Electronics Co., Ltd., Suwon-si (KR)
Filed on Mar. 4, 2022, as Appl. No. 17/687,013.
Application 17/687,013 is a continuation of application No. 16/857,796, filed on Apr. 24, 2020, granted, now 11,272,548.
Claims priority of provisional application 62/837,843, filed on Apr. 24, 2019.
Prior Publication US 2022/0272764 A1, Aug. 25, 2022
Int. Cl. H04W 74/08 (2024.01); H04L 1/1812 (2023.01); H04L 5/00 (2006.01); H04W 52/36 (2009.01); H04W 72/23 (2023.01); H04W 74/0833 (2024.01); H04W 76/11 (2018.01)
CPC H04W 74/0833 (2013.01) [H04L 1/1819 (2013.01); H04L 5/0055 (2013.01); H04W 52/36 (2013.01); H04W 72/23 (2023.01); H04W 74/0891 (2013.01); H04W 76/11 (2018.02)] 14 Claims
OG exemplary drawing
 
1. A method performed by a terminal in a wireless communication system, the method comprising:
transmitting, to a base station, a message A (MsgA) associated with a 2 step random access (RA) procedure, the MsgA including a cell-radio network temporary identifier (C-RNTI);
receiving, from the base station, a physical downlink control channel (PDCCH); and
identifying whether the 2 step RA procedure is successfully completed,
wherein the 2 step RA procedure is successfully completed, in case that a time alignment timer (TAT) is running and the PDCCH scheduling an uplink transport block (TB) is addressed to the C-RNTI, and
wherein the 2 step RA procedure is successfully completed, in case that the TAT is not running, the PDCCH scheduling a downlink TB is addressed to the C-RNTI and a timing advance (TA) command is received based on the downlink TB.