Patent ID: 7489674

Claim:
A method for wireless local area network (LAN) transmission using multiple channels, the method comprising: generating, by a second station intending to transmit data to a first station, a first announcement traffic indication message (ATIM) containing channel information regarding a first channel through which data will be transmitted, and transmitting the first ATIM via the first channel during an ATIM transmission window; if the second station loses a channel reservation competition regarding the first channel, generating, by the second station, a second ATIM containing channel information regarding a second channel different than the first channel, and transmitting the second ATIM via the first channel before the ATIM transmission window terminates; and if the second station receives an acknowledgement (ACK) from the first station in response to the second ATIM before the ATIM transmission window terminates, performing, by the second station, channel switching from the first channel to the second channel and transmitting data via the second channel after the ATIM transmission window terminates.