Method and device for transmitting data

A device configured for communicating in a wireless local area network (LAN), the device comprising:

• a radio frequency module configured to transmit and receive radio signals;
• a processor operatively coupled with the radio frequency module;
• and
• memory disposed to said processor, said memory including instructions, when executed by said processor cause the processor to:
• process a beacon frame, the beacon frame comprising at least one basic service set identifier (BSSID) and a first color value, wherein
• each BSSID identifying a basic service set (BSS) managed by an access point (AP) to which the station is associated, and
• the first color value represented by a value number of bits, the value number less than 48;
• process a physical layer protocol data unit (PPDU) over a transmission bandwidth, the PPDU comprising a First Signal field and a Second Signal field, wherein
• the First Signal field comprising bandwidth information and a second color value, the bandwidth information indicating the transmission bandwidth, and
• the Second Signal field comprising user-specific information comprising allocation for orthogonal frequency division multiple access (OFDMA) transmission;
• wherein
• the First Signal field is phase-rotated and transmitted over at least one first subcarrier group, each first subcarrier group having bandwidth of 20 MHz within the transmission bandwidth, and
• the Second Signal is phase rotated and transmitted over a plurality of second subcarrier groups, each second subcarrier group having bandwidth that is less than 20 MHz within the transmission bandwidth;
• and
• compare the first color value and the second color value to determine whether the PPDU was transmitted by the AP.