Method for transmitting frame type indication information in wireless LAN system and device therefor

A station (STA) device operating as a first STA for receiving a frame from a second STA in a wireless local area network (WLAN) system, the device comprising:

• a transceiver configured to receive the frame including a first part (L-part) for a first type STA and a second part (HE-part) for a second type STA;
• and
• a processor connected to the transceiver and configured to process the received frame based on a type of the received frame,
• wherein the first part includes a legacy short training field (L-STF), a legacy long training field (L-LTF) and a legacy signaling (L-SIG) field,
• wherein the processor determines the type of the received frame as a first type frame or a second type frame based on a result of a modulo operation for a length of the L-SIG field based on a predetermined natural number, and
• wherein the first type frame is based on a format of single-user physical protocol data unit (SU PPDU).