Transmission and reception method and device based on distributed resource unit tone plan restricted in wireless lan system

A first station (STA) device comprising:

• at least one transceiver;
• and
• at least one processor connected to the at least one transceiver,
• wherein the at least one processor is configured to:
• generate a physical layer protocol data unit (PPDU) including at least one field, wherein the at least one field is mapped on at least one distributed resource unit (DRU);
• and
• transmit, through the at least one transceiver, the PPDU to at least one second STA on a bandwidth including a 20 MHz channel,
• wherein for the PPDU related to a downlink transmission, based on the at least one DRU including a 26-tone DRU, the 26-tone DRU is one of 8 predefined 26-tone DRUs excluding one specific 26-tone DRU among 9 predefined 26-tone DRUs.

A second station (STA) device comprising:

• at least one transceiver;
• and
• at least one processor connected to the at least one transceiver,
• wherein the at least one processor comprises:
• receiving, through the at least one transceiver, a physical layer protocol data unit (PPDU) including at least one field from a first STA on a bandwidth including a 20 MHz channel;
• and
• decoding the at least one field mapped on at least one distributed resource unit (DRU),
• wherein for the PPDU related to a downlink transmission, based on the at least one DRU including a 26-tone DRU, the 26-tone DRU is one of 8 predefined 26-tone DRUs excluding one specific 26-tone DRU among 9 predefined 26-tone DRUs.