US 11,696,354 B2
Method and device for performing joint transmission in wireless LAN system
Kiseon Ryu, Seoul (KR); Sungjin Park, Seoul (KR); Sanggook Kim, Seoul (KR); Jeongki Kim, Seoul (KR); and Jinsoo Choi, Seoul (KR)
Assigned to LG ELECTRONICS INC., Seoul (KR)
Appl. No. 17/265,947
Filed by LG ELECTRONICS INC., Seoul (KR)
PCT Filed Aug. 21, 2019, PCT No. PCT/KR2019/010632
§ 371(c)(1), (2) Date Feb. 4, 2021,
PCT Pub. No. WO2020/045891, PCT Pub. Date Mar. 5, 2020.
Claims priority of provisional application 62/790,457, filed on Jan. 9, 2019.
Claims priority of provisional application 62/737,874, filed on Sep. 27, 2018.
Claims priority of provisional application 62/722,966, filed on Aug. 26, 2018.
Prior Publication US 2021/0307099 A1, Sep. 30, 2021
Int. Cl. H04W 56/00 (2009.01); H04W 76/15 (2018.01); H04W 76/11 (2018.01); H04L 1/00 (2006.01); H04L 1/1867 (2023.01); H04W 72/0446 (2023.01); H04W 80/02 (2009.01); H04W 72/23 (2023.01); H04W 84/12 (2009.01)
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
OG exemplary drawing
 
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.