A method for communicating in a wireless local area network, the method comprising: transmitting, at an access point, AP, 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 the AP, and the first color value represented by a value number of bits, the value number less than 48; transmitting, at the AP, a physical layer protocol data unit, PPDU, over a transmission bandwidth, the PPDU comprising a signal-A field and a signal-B field, wherein the signal-A field comprising bandwidth information and a second color value, the bandwidth information indicating the transmission bandwidth, and the signal-B field comprising user-specific information comprising allocation for orthogonal frequency division multiple access, OFDMA, transmission; wherein the signal-A field is phase-rotated over at least one first subcarrier group, each first subcarrier group having bandwidth of 20 MHz within the transmission bandwidth, and the signal-B is phase rotated over a plurality of second subcarrier groups, each second subcarrier group having bandwidth that is less than 20 MHz within the transmission bandwidth, and wherein the second color value matches at least a portion of the first color value. transmitting, at an access point, AP, 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 the AP, and the first color value represented by a value number of bits, the value number less than 48; transmitting, at the AP, a physical layer protocol data unit, PPDU, over a transmission bandwidth, the PPDU comprising a signal-A field and a signal-B field, wherein the signal-A field comprising bandwidth information and a second color value, the bandwidth information indicating the transmission bandwidth, and the signal-B field comprising user-specific information comprising allocation for orthogonal frequency division multiple access, OFDMA, transmission; the signal-A field comprising bandwidth information and a second color value, the bandwidth information indicating the transmission bandwidth, and the signal-B field comprising user-specific information comprising allocation for orthogonal frequency division multiple access, OFDMA, transmission; wherein the signal-A field is phase-rotated over at least one first subcarrier group, each first subcarrier group having bandwidth of 20 MHz within the transmission bandwidth, and the signal-B is phase rotated over a plurality of second subcarrier groups, each second subcarrier group having bandwidth that is less than 20 MHz within the transmission bandwidth, and the signal-A field is phase-rotated over at least one first subcarrier group, each first subcarrier group having bandwidth of 20 MHz within the transmission bandwidth, and the signal-B is phase rotated over a plurality of second subcarrier groups, each second subcarrier group having bandwidth that is less than 20 MHz within the transmission bandwidth, and wherein the second color value matches at least a portion of the first color value.