Patent ID: 8488557

Claim:
A method for detecting a duplicate address, wherein a mobile station is moving from a second access network pertaining to a second network element into a first access network pertaining to a first network element, comprising: receiving, by the first network element, a request message from the mobile station; sending, by the first network element, a first message to the mobile station upon reception of said request message, said first message designating an explicit address configuration and including prefix information; receiving, by the first network element, a message containing an address generated based on said prefix information by the mobile station, the mobile station presuming the generated address is a valid address, the message indicating that the mobile station requires registration of the generated address with the first network element without the first network element waiting for confirmation on a uniqueness of the generated address from other network elements, which has been presumed a valid address by the mobile station; and creating, by the first network element, an entry for the mobile station if the generated address is not found in its address table without waiting for the confirmation on the uniqueness of the generated address from the other network elements, or generating a second message and sending the second message to the mobile station for indicating that the generated address is a duplicate address if it is found in its address table and discarding data packets with the duplicate address sent from the mobile station.