Wireless communication method and apparatus for wireless local area network system

A wireless communication method performed by a wireless communication apparatus in a wireless local area network (WLAN) system, the wireless communication method comprising:

• receiving, by the wireless communication apparatus corresponding to one of multiple users from a transmission apparatus, a frame comprising an SIG-A field and an SIG-B field, wherein the SIG-B field comprises bit information that comprises subchannel allocation information in an Orthogonal Frequency-Division Multiple Access (OFDMA) mode where different subchannels are allocated to different users and simultaneous data transmission to the multiple users is allowed;
• and
• determining each of subchannels to be used for communications based on at least the subchannel allocation information, and
• wherein the SIG-B field further comprises bit information indicating a number of space-time streams (NSTS) of channels transmitted in the OFDMA mode, and bit information indicating a modulation and coding mode used by each channel in the OFDMA mode.

A wireless communication apparatus comprising:

• a processor to generate a frame comprising an SIG-A field and an SIG-B field, wherein the SIG-B field comprises bit information comprising subchannel allocation information in an Orthogonal Frequency-Division Multiple Access (OFDMA) mode where different subchannels are allocated to different users and simultaneous data transmission to multiple users is allowed;
• and
• a transmitter to transmit the generated frame to the multiple users, and
• wherein the SIG-B field further comprises bit information indicates a number of space-time streams (NSTS) of channels transmitted in the OFDMA mode, and a modulation and coding mode used by each channel in the OFDMA mode.