Method and device for transmitting and receiving guard interval-based ppdu 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:
• receive, through the at least one transceiver, from a second STA, a physical layer protocol data unit (PPDU) including a first at least one field and a second at least one field, wherein the first at least one field includes at least one non-legacy signal (SIG) field, and the second at least one field includes a data field;
• and
• decode the first at least one field and the second at least one field, and obtain a medium access control protocol data unit (MPDU) based on the data field,
• wherein a guard interval for the second at least one field is predefined as a single value.

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 is configured to:
• encode a first at least one field including at least one non-legacy signal (SIG) field, and a second at least one field including a data field including a medium access control protocol data unit (MPDU);
• and
• transmit, through the at least one transceiver, to a first STA, a physical layer protocol data unit (PPDU) including the first at least one field and the second at least one field,
• wherein a guard interval for the second at least one field is predefined as a single value.