Patent ID: 8848670

Claim:
An authentication system in a wireless Local Area Network (LAN) environment, the system comprising: a first wireless LAN access point configured to acquire authentication information on a terminal device from an authentication server, and provide a wireless LAN service to the terminal device accessing the first wireless LAN access point; the terminal device configured to transmit an authentication request to a second wireless LAN access point when the terminal device moves to access the second wireless LAN access point while receiving the wireless LAN service through the first wireless LAN access point; and the second wireless LAN access point configured to identify the first wireless LAN access point based on identification information contained in the authentication request transmitted from the terminal device, acquire the authentication information on the terminal device from the identified first wireless LAN access point, wherein the authentication information on the terminal device has been acquired by the first wireless LAN access point from the authentication server, and perform an authentication for the terminal device based on the authentication information acquired from the first wireless LAN access point, wherein the second wireless LAN access point comprises an initial access unit configured to receive the authentication request from the terminal device, and wherein the authentication request contains one or more of an MAC address of the terminal device and an MAC address of the first wireless LAN access point, and wherein the second wireless LAN access point comprises an authentication unit configured to identify IP information of the first wireless LAN access point based on the MAC address of the first wireless LAN access point contained in the authentication request, and transfer the MAC address of the terminal device to the first wireless LAN access point based on the identified IP information for requesting the authentication information.