Patent ID: 7826405

Claim:
A wireless local area network system, comprising: a gateway performing functions of a home agent in a mobile wireless communication environment and sending prefix information; and one or more access points, each access point allocating an Internet Protocol (IP) address to a mobile host in a management range thereof by using the prefix information of the gateway, wherein said each access point produces and sends a Binding Update list corresponding to the mobile host to the gateway, wherein when said mobile host moves into a range of a different access point associated with a new access router, said mobile host retains the prefix information of the gateway, wherein the new access router generates an access router advertisement message based on a prefix advertisement message received from the gateway and sends the generated access router advertisement message to said different access point, wherein said different access point extracts the prefix information of the gateway based on the access router advertisement message and transfers the extracted prefix information to the mobile host; wherein the mobile host receives the prefix information of the gateway and retains the received prefix information, and wherein respective mobile hosts in networks controlled by the gateway have a same prefix in addition to a mobile host ID, said mobile host ID being a media access control (MAC) address, and wherein said each access point allocates a unique IP address for each mobile host in all the networks controlled by the gateway by combining the prefix information received from the gateway with the mobile host ID received from the mobile host.