Method and device for transmitting ppdu on basis of fdr in wireless lan system

An access point (AP) transmitting and receiving a Physical layer Protocol Data Unit (PPDU) based on Full-Duplex Radio (FDR) in a wireless LAN system, the AP comprising:

• a transceiver transmitting or receiving a radio signal;
• and
• a processor controlling the transceiver, wherein the processor is configured to
• generate FDR indication information on that the AP is capable of performing the FDR;
• transmit a downlink (DL) PPDU including the FDR indication information to a first station (STA) and a second STA;
• and
• receive a first uplink (UL) PPDU from the first STA and a second UL PPDU from the second STA, wherein
• the DL PPDU includes a legacy signal field, a first signal field, a second signal field, and a DL data field;
• the second signal field includes allocation information on a first resource unit (RU) to which the DL data field is allocated;
• when the DL PPDU further includes a third signal field, the third signal field includes allocation information on a second RU to which the first UL PPDU and the second UL PPDU are allocated, information on an identifier of an STA to transmit the first UL PPDU and the second UL PPDU, and information on transmission time of the first UL PPDU and the second UL PPDU;
• the second RU is an RU excluding the first RU from the whole band;
• the DL PPDU, the first UL PPDU, and the second UL PPDU are transmitted and received based on the FDR;
• the first UL PPDU is received from the first STA through half of the second RU;
• and
• the second UL PPDU is received from the second STA through the other half of the second RU.