Method and device for transmitting/receiving ppdu in wide bandwidth on basis of trigger frame in wireless lan system

A first station (STA) comprising:

• at least one transceiver;
• and
• at least one processor coupled to the at least one transceiver,
• wherein the at least one processor is configured to:
• receive, through the at least one transceiver, a trigger frame including a special user information field from a second STA;
• and
• transmit, through the at least one transceiver, a trigger-based (TB) physical layer protocol data unit (PPDU) to the second STA within a specific bandwidth based on the trigger frame,
• wherein the special user information field includes an uplink (UL) bandwidth extension subfield and a specific subfield related to the extended bandwidth, and
• wherein based on a UL bandwidth subfield value included in the trigger frame being set to 3 and the UL bandwidth extension subfield value being set to 2 or 3, the specific bandwidth is indicated as 480 MHz or 560 MHz according to the specific subfield.

A second station (STA) comprising:

• at least one transceiver;
• and
• at least one processor coupled to the at least one transceiver,
• wherein the at least one processor is configured to:
• transmit, through the at least one transceiver, a trigger frame including a special user information field to a first STA;
• and
• receive, through the at least one transceiver, a trigger-based (TB) physical layer protocol data unit (PPDU) from the first STA within a specific bandwidth based on the trigger frame,
• wherein the special user information field includes an uplink (UL) bandwidth extension subfield and a specific subfield related to the extended bandwidth, and
• wherein based on a UL bandwidth subfield value included in the trigger frame being set to 3 and the UL bandwidth extension subfield value being set to 2 or 3, the specific bandwidth is indicated as 480 MHz or 560 MHz according to the specific subfield.