| 摘要 |
A layer 2 switch device, an authentication server, and a terminal device are connected to each other by a network, and a plurality of radio base stations are connected to the layer 2 switch device. A radio mobile terminal is authenticated by the authentication server. When a radio base station receives authentication result information from the authentication server, the radio base station sends the association information and authentication result information of the radio mobile terminal to the layer 2 switch device, which registers the received information in an authentication management table thereof. Subsequently, the layer 2 switch device manages the association information, authentication result information, and crypt key information of the radio mobile terminal in its own authentication management table. When the layer 2 switch device receives a re-authentication request from the radio mobile terminal, the layer 2 switch device refers to the information stored in the authentication management table. If the radio mobile terminal has already been authenticated, then the layer 2 switch device sends an access permission to the radio base station.
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