US 12,082,266 B2
Random access method and apparatus in wireless communication system
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 Apr. 19, 2023, as Appl. No. 18/303,161.
Application 18/303,161 is a continuation of application No. 16/588,001, filed on Sep. 30, 2019, granted, now 11,653,387.
Claims priority of provisional application 62/738,374, filed on Sep. 28, 2018.
Prior Publication US 2023/0269783 A1, Aug. 24, 2023
Int. Cl. H04W 74/0833 (2024.01); H04W 24/08 (2009.01); H04W 72/23 (2023.01); H04W 76/11 (2018.01); H04W 80/02 (2009.01)
CPC H04W 74/0833 (2013.01) [H04W 24/08 (2013.01); H04W 72/23 (2023.01); H04W 76/11 (2018.02); H04W 80/02 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method performing two-step random access (RA) in a user equipment (UE), the method comprising:
transmitting a message A (MsgA) to a base station, the MsgA including an RA preamble on physical random access channel (PRACH) and a payload on physical uplink shared channel (PUSCH);
monitoring a physical downlink control channel (PDCCH) for a message B (MsgB) corresponding to the MsgA from the base station within a configured time window for an RA response of the two-step RA; and
receiving the MsgB from the base station, wherein the MsgB includes at least one medium access control (MAC) sub protocol data unit (subPDU),
wherein a MAC subPDU of the at least one MAC subPDU includes a MAC subheader,
wherein the MAC subheader includes a first bit field indicating whether the MAC subheader includes a random access preamble identifier (RAPID) or a second bit field, and
wherein the second bit field is included in the MAC subheader in case that:
the MAC subPDU including the MAC subheader includes a contention resolution identity (ID), or
a backoff indicator (BI) is included in the MAC subheader.