Patent ID: 8270974

Claim:
An access router comprising: a message receiver for receiving a new connection notification message, the new connection notification message generated at a point of attachment in response to the point of attachment making a new link layer connection with a mobile unit and comprising a link layer address of the mobile unit and a regional care of address (RCoA) of the mobile unit; a controller for extracting a domain network prefix of the mobile unit from the RCoA of the mobile unit and determining whether the mobile unit moves to a new mobile anchor point (MAP) domain by comparing the domain network prefix of the mobile unit, which is extracted from the RCoA of the mobile unit, with a domain network prefix assigned to the access router; and a message transmitter for sending a router advertisement (RA) message to the mobile unit in response to receiving the new connection notification message, wherein the message transmitter sends the RA message to the mobile unit by using the link layer address of the mobile unit, and the RA message comprises a new on-link care of address (LCoA) assigned to the mobile unit.