Method for constructing preamble in wireless communication system

A method performed by a transmitting station (STA) in a wireless local area network (WLAN) system, the method comprising:

• generating a Physical Layer Protocol Data Unit (PPDU),
• wherein the PPDU includes a universal signal (U-SIG) field and an extremely high throughput signal (EHT-SIG) field,
• wherein the U-SIG field has a length of two symbols,
• wherein the U-SIG field includes first information related to a Physical layer (PHY) version of the PPDU, and the first information has a length of 3 bits, wherein the first information indicates on whether the PPDU is an extremely high throughput (EHT) PPDU,
• wherein the U-SIG field further includes second information related to whether the PPDU is related to a single user (SU) transmission,
• wherein based on the PPDU being related to the SU transmission and the bandwidth of the PPDU being greater than 20 MHz, the EHT-SIG field has a single content channel which is duplicated in every 20 MHz subchannel,
• wherein the single content channel includes a common field and a user specific field;
• and
• transmitting the PPDU.

A transmitting station (STA) in a wireless local area network (WLAN) system, comprising:

• a transceiver transmitting a wireless signal;
• and
• a processor coupled to the transceiver,
• wherein processor is adapted to:
• generate a Physical Layer Protocol Data Unit (PPDU),
• wherein the PPDU includes a universal signal (U-SIG) field and an extremely high throughput signal (EHT-SIG) field,
• wherein the U-SIG field has a length of two symbols,
• wherein the U-SIG field includes first information related to a Physical layer (PHY) version of the PPDU, and the first information has a length of 3 bits, wherein the first information indicates based on whether the PPDU is an extremely high throughput (EHT) PPDU,
• wherein the U-SIG field further includes second information related to whether the PPDU is related to a single user (SU) transmission,
• wherein based on the PPDU being related to the SU transmission and the bandwidth of the PPDU being greater than 20 MHz, the EHT-SIG field has a single content channel which is duplicated in every 20 MHz subchannel,
• wherein the single content channel includes a common field and a user specific field;
• and
• transmit the PPDU.