Patent ID: 8649340

Claim:
A wireless LAN system including a first wireless LAN relay device and a second wireless LAN relay device that are able to wirelessly communicate with each other by using a plurality of channels, and a station that is able to wirelessly communicate with the first wireless LAN relay device, wherein the first wireless LAN relay device comprises: a requesting section for transmitting a first probe request by using a second channel selected from among a plurality of channels that the first wireless LAN relay device can use, the first probe request being assigned channel information indicating a first channel that the first wireless LAN relay device currently uses for communication with the station; and a post-request restoring section for restoring the channel to be used by the first wireless LAN relay device from the second channel to the first channel within a first predetermined period from start of use of the second channel, after the transmission of the first probe request, when the second channel is not identical to the first channel; and the second wireless LAN relay device comprises: a responding section for receiving the first probe request by using the second channel, specifying the first channel based on the channel information assigned to the first probe request, and transmitting a probe response to the first wireless LAN relay device by using the first channel; and a post-response restoring section for restoring the channel to be used by the second wireless LAN relay device from the first channel to the second channel within a second predetermined period from start of use of the first channel, after the transmission of the probe response, when the second channel is not identical to the first channel, wherein the requesting section successively selects an additional channel, each time the requesting section transmits another probe request after the first probe request, until all the channels that the first wireless LAN relay device can use have been selected, and wherein the first wireless LAN relay device further comprises a waiting control section for controlling the first wireless LAN relay device so as to restore the channel from the second channel to the first channel using the post-request restoring section, each time the requesting section transmits the another probe request after the first probe request, and wait at the first channel for more than a beacon transmission period during which the first wireless LAN relay device transmits a beacon to the station, before transmitting the another probe request.