US 9,814,078 B2
Method and apparatus for determining contention window size in communication system
Seung Keun Park, Daejeon (KR); Sungjin Yoo, Daejeon (KR); Jung Sun Um, Daejeon (KR); Hoiyoon Jung, Daejeon (KR); and Hyung Do Choi, Daejeon (KR)
Assigned to ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE, Daejeon (KR)
Filed by ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE, Daejeon (KR)
Filed on Mar. 9, 2016, as Appl. No. 15/65,602.
Claims priority of application No. 10-2015-0034232 (KR), filed on Mar. 12, 2015; application No. 10-2015-0111008 (KR), filed on Aug. 6, 2015; and application No. 10-2016-0025910 (KR), filed on Mar. 3, 2016.
Prior Publication US 2016/0269303 A1, Sep. 15, 2016
Int. Cl. H04W 74/08 (2009.01); H04W 84/12 (2009.01)
CPC H04W 74/085 (2013.01) [H04W 84/12 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method in which a wireless device of a communication system determines a contention window size, the method comprising:
randomly selecting a backoff counter at a contention window interval corresponding to a contention window size that is determined according to a backoff stage;
attempting packet transmission, if the backoff counter becomes 0 while reducing the backoff counter, when a radio channel is in an idle status; and
increasing the contention window size while increasing the backoff stage by 1 according to a first predetermined condition,
wherein the contention window size has a concave down increasing form, as the backoff stage increases.