Patent ID: 7983220

Claim:
A wireless local area network (LAN) system, comprising: a wireless LAN terminal; and a plurality of wireless LAN access points each having an identical ESSID (Extended Service Set Identifier) and sharing wireless LAN terminal information that comprises a MAC address, security information and a time stamp of the wireless LAN terminal which has been authenticated, wherein said wireless LAN terminal stores a MAC (Media Access Control) header of a communication frame that includes a BSSID (Basic Service Set Identifier) for said each of said plurality of wireless LAN access points, wherein said each of said plurality of wireless LAN access points is configured to communicate with the wireless LAN terminal without requiring authorization when any one of said plurality of wireless LAN access points has been authorized, and a frame control for which said advance authorization with said any one of said plurality of wireless LAN access points has been completed, and further wherein, in case of switching from a first wireless LAN access point of said plurality of wireless LAN access points to a second wireless LAN access point of said plurality of wireless LAN access points, said wireless LAN terminal replaces, in the MAC header of the communication frame to be transmitted, a first BSSID of a said first wireless LAN access point with a second BSSID of said second wireless LAN access point, using said frame control without change with respect to the plurality of LAN access points, in the communication frame to be transmitted, and continues communication without requiring authentication.