US 12,150,170 B2
Method and apparatus for listen-before-talk (LBT) related operation in a wireless communication system using unlicensed band
Yi Wang, Beijing (CN); Yingyang Li, Beijing (CN); and Shichang Zhang, Beijing (CN)
Assigned to Samsung Electronics Co., Ltd., Suwon-si (KR)
Filed by Samsung Electronics Co., Ltd., Suwon-si (KR)
Filed on May 9, 2022, as Appl. No. 17/739,812.
Application 17/739,812 is a continuation of application No. 16/488,782, granted, now 11,330,624, previously published as PCT/KR2018/003386, filed on Mar. 22, 2018.
Claims priority of application No. 201710187125.3 (CN), filed on Mar. 24, 2017; application No. 201710555342.3 (CN), filed on Jul. 7, 2017; and application No. 201710683187.3 (CN), filed on Aug. 10, 2017.
Prior Publication US 2022/0264637 A1, Aug. 18, 2022
Int. Cl. H04L 1/1812 (2023.01); H04L 1/1867 (2023.01); H04W 16/14 (2009.01); H04W 72/1268 (2023.01); H04W 72/23 (2023.01); H04W 74/00 (2009.01); H04W 74/02 (2009.01); H04W 74/04 (2009.01); H04W 74/08 (2009.01); H04W 74/0808 (2024.01)
CPC H04W 74/02 (2013.01) [H04L 1/1812 (2013.01); H04L 1/1896 (2013.01); H04W 16/14 (2013.01); H04W 72/1268 (2013.01); H04W 72/23 (2023.01); H04W 74/006 (2013.01); H04W 74/04 (2013.01); H04W 74/08 (2013.01); H04W 74/0808 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A method performed by a terminal in a wireless communication system, the method comprising:
obtaining listen before talk (LBT) related information including information on at least one LBT priority class;
transmitting two or more physical uplink shared channels (PUSCHs) on a cell associated with an unlicensed band using resources for a periodic uplink transmission configured via higher layer signaling, based on the LBT related information;
receiving downlink control information (DCI) including downlink feedback information, the downlink feedback information explicitly indicating two or more hybrid automatic repeat request (HARQ)-acknowledgement (ACK) feedbacks corresponding to the two or more PUSCHs which are transmitted using the resources for the periodic uplink transmission; and
adjusting a contention window value for an uplink transmission, based on the LBT related information and the two or more HARQ-ACK feedbacks,
wherein the adjusting of the contention window value comprises:
in case that at least one of the two or more HARQ-ACK feedbacks indicates an ACK, setting the contention window value for every LBT priority class to a minimum value, and
in case that all of the two or more HARQ-ACK feedbacks indicate a negative ACK (NACK), increasing the contention window value for every LBT priority class to a next higher allowed value based on the LBT related information.