US 11,985,089 B2
Sounding to mixed bandwidth stations
Rui Cao, Sunnyvale, CA (US); Sudhir Srinivasa, Los Gatos, CA (US); Xiayu Zheng, San Jose, CA (US); and Hongyuan Zhang, Fremont, CA (US)
Assigned to NXP USA, Inc., Austin, TX (US)
Filed by NXP USA, Inc., Austin, TX (US)
Filed on Oct. 6, 2021, as Appl. No. 17/495,367.
Claims priority of provisional application 63/090,831, filed on Oct. 13, 2020.
Prior Publication US 2022/0116179 A1, Apr. 14, 2022
Int. Cl. H04L 5/00 (2006.01); H04B 7/06 (2006.01)
CPC H04L 5/0051 (2013.01) [H04B 7/0617 (2013.01); H04B 7/0639 (2013.01); H04L 5/001 (2013.01)] 28 Claims
OG exemplary drawing
 
1. A method of sounding a plurality of stations (STAs) comprising:
grouping the STAs into a beamforming sounding sequence using a beamformer;
transmitting a null data packet announcement (NDPA) to the STAs,
wherein the NDPA indicates a requested partial bandwidth channel feedback beamforming report for each STA in response to a null data packet (NDP);
transmitting the NDP in an orthogonal frequency division modulation access (OFDMA) format to the STAs by the beamformer;
transmitting a beamforming report poll (BFRP) frame to the STAs to trigger uplink transmission of the requested channel feedback beamforming reports; and
receiving and parsing the requested channel feedback beamforming reports from the STAs;
wherein a bandwidth of the NDP is greater than an operating bandwidth of at least one of the STAs and is less than an operating bandwidth of at least another one of the STAs.