CPC H04W 76/15 (2018.02) [H04L 1/0004 (2013.01); H04L 1/1896 (2013.01); H04W 56/001 (2013.01); H04W 72/0446 (2013.01); H04W 72/23 (2023.01); H04W 76/11 (2018.02); H04W 80/02 (2013.01); H04W 84/12 (2013.01)] | 12 Claims |
1. A method of performing joint transmission in a WLAN system, comprising:
transmitting, by a master-access point (M-AP), a null data packet announcement (NDPA) frame for the joint transmission to first to third slave-access points (S-APs);
based on channel state information, selecting, by the M-AP, the first and second S-APs which is to participate in the joint transmission;
transmitting, by the M-AP to the first and second S-APs, a first control frame for providing notification of the joint transmission;
transmitting, by the M-AP to the first and second S-APs, a data frame;
transmitting, by the M-AP to the first and second S-APs, a second control frame comprising scheduling information necessary for the joint transmission; and
performing, by the M-AP, the joint transmission on a station (STA) through the first and second S-APs,
wherein the data frame is transmitted from the first and second S-APs to the STA through the joint transmission,
wherein the channel state information is measured by the STA and included in a null data packet (NDP) frame,
wherein the NDP frame is transmitted from the STA to the first to third S-APs based on an NDP trigger frame,
wherein the NDP trigger frame is transmitted from the third S-AP to the STA based on the NDPA frame, and
wherein the third S-AP is associated with the STA.
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