US 11,792,855 B2
Wireless communication terminal and wireless communication method for random access-based uplink multi-user transmission
Woojin Ahn, Gyeonggi-do (KR); Juhyung Son, Gyeonggi-do (KR); Jinsam Kwak, Gyeonggi-do (KR); and Geonjung Ko, Gyeonggi-do (KR)
Assigned to WILUS INSTITUTE OF STANDARDS AND TECHNOLOGY INC., Gyeonggi-Do (KR); and SK TELECOM CO., LTD., Seoul (KR)
Filed by WILUS INSTITUTE OF STANDARDS AND TECHNOLOGY INC., Gyeonggi-do (KR); and SK TELECOM CO., LTD., Seoul (KR)
Filed on Jul. 26, 2022, as Appl. No. 17/873,148.
Application 17/873,148 is a continuation of application No. 17/101,755, filed on Nov. 23, 2020, granted, now 11,445,546.
Application 17/101,755 is a continuation of application No. 16/188,274, filed on Nov. 12, 2018, granted, now 10,880,924, issued on Dec. 29, 2020.
Application 16/188,274 is a continuation of application No. PCT/KR2017/004889, filed on May 11, 2017.
Claims priority of application No. 10-2016-0057759 (KR), filed on May 11, 2016; application No. 10-2016-0117898 (KR), filed on Sep. 13, 2016; and application No. 10-2017-0002720 (KR), filed on Jan. 9, 2017.
Prior Publication US 2022/0361245 A1, Nov. 10, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H04W 74/08 (2009.01); H04W 84/12 (2009.01)
CPC H04W 74/0816 (2013.01) [H04W 74/08 (2013.01); H04W 74/0833 (2013.01); H04W 84/12 (2013.01); H04W 74/0808 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A wireless communication terminal, the terminal comprising:
a processor; and
a communication unit,
wherein the processor is configured to:
obtain contention window information for a contention window for selecting an OBO (orthogonal frequency division multiple access (OFDMA) random access backoff) counter,
wherein the OBO counter is selected within the contention window,
receive a trigger frame including a resource allocation field and a CS(Carrier Sensing) required field indicating whether a carrier sensing is required,
perform carrier sensing according to a value of the CS required field,
wherein a new OBO counter is randomly selected within the contenting window, when a channel for transmitting an uplink frame is busy based on the CS,
transmit the uplink frame according to a state of the channel based on the CS when the OBO counter or the new OBO counter is ‘0’ or decreased to ‘0’, and
wherein the OBO counter or the new OBO counter is not decremented when there is no pending data to be transmitted by the terminal.