Patent ID: 8625562

Claim:
A method for a wireless local area network (WLAN) system, the method comprising: generating a medium access control (MAC) protocol data unit (MPDU) to be transmitted to a target station (STA); generating a physical layer convergence procedure (PLCP) protocol data unit (PPDU) by attaching a PLCP preamble to the MPDU; selecting a transmission channel; and transmitting the PPDU to the target STA over the transmission channel, wherein selecting the transmission channel comprises: performing clear channel assessment (CCA) on a primary channel to determine whether the primary channel is idle during an interval of a point coordination function (PCF) interframe space (PIFS); and only after it is determined that the primary channel is idle during the interval of the PIFS, selecting the primary channel and at least one idle secondary channel as the transmission channel, the at least one idle secondary channel being at least one of a plurality of secondary channels that was idle during the interval of the PIFS, and wherein the PLCP preamble includes channel allocation information indicating a bandwidth of the transmission channel.