US 11,716,121 B2
NDPA for multi-AP coordinated beamforming (CBF) and multi-AP joint transmission (JT) in EHT
Feng Jiang, Sunnyvale, CA (US); Qinghua Li, San Ramon, CA (US); Xiaogang Chen, Portland, OR (US); Po-Kai Huang, San Jose, CA (US); Danny Alexander, Neve Efraim Monoson (IL); Chen Kojokaro, Yoqneam Illit (IL); Assaf Gurevitz, Ramat Hasharon (IL); and Ziv Avital, Kadima (IL)
Assigned to Intel Corporation, Santa Clara, CA (US)
Filed by Intel Corporation, Santa Clara, CA (US)
Filed on Oct. 23, 2020, as Appl. No. 17/78,366.
Claims priority of provisional application 62/926,140, filed on Oct. 25, 2019.
Prior Publication US 2021/0044333 A1, Feb. 11, 2021
Int. Cl. H04B 7/024 (2017.01); H04B 7/06 (2006.01); H04W 84/12 (2009.01)
CPC H04B 7/024 (2013.01) [H04B 7/0617 (2013.01); H04B 7/0626 (2013.01); H04W 84/12 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An apparatus of an access point (AP) configured for multi-AP coordinated beamforming (CBF) and multi-AP joint transmission (JT) in an Extremely High Throughput (EHT) wireless local area network (WLAN), the apparatus comprising: processing circuitry and memory,
wherein when the AP is operating as a master AP (AP1) in a multi-AP network, the processing circuitry is configured to:
encode a null data packet announcement (NDPA) frame for multi-AP channel sounding, the NDPA for transmission to a second AP (AP2) and a plurality of stations (STAs) of an EHT group, the NDPA encoded to have an information field indicating whether a sounding sequence type is for JT channel sounding or CBF channel sounding, the NDPA further encoded to include fields identifying APs participating in the channel sounding including the AP1 and the AP2;
encode a first null data packet (NDP1) for transmission to the STAs of the EHT group, the NDP1 to be transmitted concurrently with a second null data packet (NDP2) from the AP2, the NDP1 and the NPD2 comprising sounding sequences for either the JT channel sounding or the CBF channel sounding, the NDP1 and the NPD2 transmitted via a plurality of spatial streams; and
decode a channel state information (CSI) report frame receive from each STA of the EHT group, wherein each CSI report frame includes channel state information determined by one of the STAs of the EHT group based on both the NDP1 and the NDP2,
wherein for the CBF channel sounding, the CSI reports are determined by the STAs separately for the NDP1 and the NDP2, and
wherein for the JT channel sounding, the CSI reports are determined by the STAs from a combined reception of the NDP1 and the NDP2.