Method and apparatus for transmitting C-OFDMA PPDU in wireless LAN system

A wireless device being a first access point (AP) for transmitting a Coordinated-Orthogonal Frequency Division Multiple Access (C-OFDMA) Physical Protocol Data Unit (PPDU) in a wireless LAN system, the first AP comprising:

• a memory;
• a transceiver;
• and
• a processor being operatively connected to the memory and the transceiver,
• wherein the processor is configured to:
• transmit a C-OFDMA request frame to a second AP,
• receive a C-OFDMA response frame from the second AP as a response to the C-OFDMA request frame, and
• transmit a first C-OFDMA PPDU to a first station (STA) through a first channel, wherein a second C-OFDMA PPDU is transmitted, by the second AP, through a second channel at a same time as the first PPDU,
• wherein the C-OFDMA request frame includes first information authorizing usage of the second channel for the second AP,
• wherein the first channel is a channel excluding a preamble-punctured channel from a full channel, and
• wherein the second channel is the preamble-punctured channel.

A method for receiving a Coordinated-Orthogonal Frequency Division Multiple Access (C-OFDMA) Physical Protocol Data Unit (PPDU) in a wireless LAN system, the method comprising:

• receiving, by a station (STA), a first C-OFDMA PPDU from a first access point (AP) through a first channel;
• and
• transmitting, by the STA, a Block Ack (BA) for the first C-OFDMA PPDU to the first AP through the first channel,
• wherein the first C-OFDMA PPDU is transmitted based on a C-OFDMA request frame and a C-OFDMA response frame,
• wherein the C-OFDMA request frame and the C-OFDMA response frame are exchanged between the first AP and the second AP,
• wherein a second C-OFDMA PPDU is transmitted, by the second AP, through a second channel at a same time as the first PPDU,
• wherein the C-OFDMA request frame includes first information authorizing usage of the second channel for the second AP,
• wherein the first channel is a channel excluding a preamble-punctured channel from a full channel, and
• wherein the second channel is the preamble-punctured channel.