Method and device for performing joint transmission in wireless LAN system
AssigneeLG Electronics Inc.
InventorsKiseon Ryu, Sungjin Park, Sanggook Kim, Jeongki Kim, Jinsoo Choi
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Abstract
Provided are a method and device for performing joint transmission in wireless LAN system. Particularly, an M-AP transmits a first control frame for informing of joint transmission to first and second S-APs. The M-AP transmits a data frame to the first and second S-APs. The M-AP transmits a second control frame, comprising scheduling information necessary for joint transmission, to the first and second S-APs. The M-AP performs joint transmission to an STA by means of the first and second SAPs. The data frame is transmitted to the STA from the first and second S-APs by means of joint transmission.
Claims12
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.
A master-access point (M-AP) for performing joint transmission in a WLAN system, wherein the M-AP comprises:
- a memory;
- a transceiver;
- and
- a processor operatively coupled to the memory and the transceiver,
- wherein the processor
- transmits 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, selects the first and second S-APs which is to participate in the joint transmission;
- transmits to the first and second S-APs a first control frame for providing notification of the joint transmission,
- transmits a data frame to the first and second S-APs,
- transmits to the first and second S-APs a second control frame comprising scheduling information necessary for the joint transmission, and
- performs 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.
Dependencies are inferred from the claim text.