US 12,471,151 B2
Orthogonal frequency division multiple access communication apparatus and communication method
Lei Huang, Singapore (SG); Rojan Chitrakar, Singapore (SG); Yoshio Urabe, Nara (JP); and Isamu Yoshii, Chiba (JP)
Assigned to Panasonic Intellectual Property Corporation of America, Torrance, CA (US)
Filed by Panasonic Intellectual Property Corporation of America, Torrance, CA (US)
Filed on Jun. 7, 2023, as Appl. No. 18/330,848.
Application 18/330,848 is a continuation of application No. 17/227,075, filed on Apr. 9, 2021, granted, now 11,711,857.
Application 17/227,075 is a continuation of application No. 16/322,419, granted, now 11,006,461, issued on May 11, 2021, previously published as PCT/JP2017/029706, filed on Aug. 21, 2017.
Claims priority of provisional application 62/385,006, filed on Sep. 8, 2016.
Claims priority of application No. 2016-245567 (JP), filed on Dec. 19, 2016.
Prior Publication US 2023/0319902 A1, Oct. 5, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H04W 74/0833 (2024.01); H04L 5/00 (2006.01); H04W 72/0446 (2023.01); H04W 72/21 (2023.01); H04W 74/00 (2009.01); H04W 76/11 (2018.01)
CPC H04W 74/085 (2013.01) [H04L 5/0007 (2013.01); H04L 5/0091 (2013.01); H04W 72/0446 (2013.01); H04W 72/21 (2023.01); H04W 74/004 (2013.01); H04W 76/11 (2018.02)] 14 Claims
OG exemplary drawing
 
1. A communication apparatus that is a 20 MHz operating station, comprising:
at least one antenna which, in operation, receives a Trigger frame for allocating resource units (RUs) for random access and another frame including a Random Access parameter element that comprises a first field indicating an OFDMA contention window (OCW) minimum value (OCWmin), wherein the RU(s) include at least one RU that is restricted from being used for the 20 MHz operating station; and
control circuitry which, in operation, controls an Uplink OFDMA-based Random Access (UORA) procedure using the OCWmin,
wherein the control circuitry, in operation:
decrements an OFDMA Back-Off (OBO) counter to zero when the OBO counter is not greater than a number of available RU(s) for random access in the Trigger frame, the available RU(s) being RU(s) unrestricted from being used for the 20 MHz operating station; or
decrements the OBO counter by the number of the available RU(s) for random access otherwise.