US 11,917,684 B2
Channel access procedure by apparatus in unlicensed band
Sechang Myung, Seoul (KR); Suckchel Yang, Seoul (KR); Seonwook Kim, Seoul (KR); Joonkui Ahn, Seoul (KR); and Changhwan Park, Seoul (KR)
Assigned to LG ELECTRONICS INC., Seoul (KR)
Appl. No. 17/421,652
Filed by LG ELECTRONICS INC., Seoul (KR)
PCT Filed Jan. 13, 2020, PCT No. PCT/KR2020/000597
§ 371(c)(1), (2) Date Jul. 8, 2021,
PCT Pub. No. WO2020/145784, PCT Pub. Date Jul. 16, 2020.
Claims priority of provisional application 62/887,661, filed on Aug. 15, 2019.
Claims priority of application No. 10-2019-0004105 (KR), filed on Jan. 11, 2019; and application No. 10-2019-0036051 (KR), filed on Mar. 28, 2019.
Prior Publication US 2022/0086908 A1, Mar. 17, 2022
Int. Cl. H04W 74/08 (2009.01); H04W 16/14 (2009.01)
CPC H04W 74/0816 (2013.01) [H04W 74/0875 (2013.01); H04W 16/14 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method for performing a channel access procedure of a terminal in an unlicensed band, the method comprising:
determining a contention window size (CWS) as a first CWS value; and
performing a channel access procedure for a first channel based on the first CWS value,
wherein the channel access procedure comprises:
i) setting a value for a counter (N) as Ninit, where Ninit is a random number between 0 and the determined CWS, wherein the determined CWS is based on a channel access priority class signaled to the terminal,
ii) sensing a channel for an additional sensing slot duration,
iii) based on the additional sensing slot duration being idle, N being larger than 0, and the terminal choosing to decrement the counter, setting N equal to N−1, and
iv) transmitting a signal through the channel after N is zero, and
wherein, based on a transmission history of a second channel to be reflected in the determining of the CWS being absent for a specific time duration, the CWS is changed from the first CWS value to a second CWS value which is a minimum CWS value in a specific channel access priority class (CAPC).