US 12,273,913 B2
Method and apparatus for random access
Qi Xiong, Beijing (CN); Yi Wang, Beijing (CN); Feifei Sun, Beijing (CN); and Bin Yu, Beijing (CN)
Assigned to Samsung Electronics Co., Ltd., Suwon-si (KR)
Appl. No. 17/594,756
Filed by Samsung Electronics Co., Ltd., Suwon-si (KR)
PCT Filed Apr. 27, 2020, PCT No. PCT/KR2020/005528
§ 371(c)(1), (2) Date Oct. 28, 2021,
PCT Pub. No. WO2020/222481, PCT Pub. Date Nov. 5, 2020.
Claims priority of application No. 201910365247.6 (CN), filed on Apr. 30, 2019; application No. 201910754878.7 (CN), filed on Aug. 15, 2019; application No. 201911084066.2 (CN), filed on Nov. 7, 2019; and application No. 202010255532.5 (CN), filed on Apr. 2, 2020.
Prior Publication US 2022/0272748 A1, Aug. 25, 2022
Int. Cl. H04W 74/00 (2009.01); H04W 72/044 (2023.01); H04W 72/1268 (2023.01); H04W 74/08 (2009.01); H04W 74/0833 (2024.01)
CPC H04W 74/004 (2013.01) [H04W 72/044 (2013.01); H04W 72/1268 (2013.01); H04W 74/0833 (2013.01); H04W 74/0866 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method performed by a terminal in a wireless communication system, the method comprising:
receiving, from a base station, first information for transmission of a physical random access channel (PRACH) associated with 2 step random access (RA) and second information for transmission of a physical uplink shared channel (PUSCH) associated with the 2 step RA;
transmitting, to the base station, a PRACH preamble associated with the 2 step RA in a first slot based on the first information;
and PUSCH in a second slot based on the second information, wherein the second slot is different from the first slot;
identifying whether a response message associated with the 2 step RA is received;
as a response to the response message associated with the 2 step RA not being received, switching from the 2 step RA to a 4 step RA and
increasing a power ramping counter; and
transmitting, to the base station, a PRACH preamble associated with the 4 step RA based on the power ramping counter.