Patent ID: 8089931

Claim:
A fast handover method using candidate care-of addresses (CoAs), the method comprising: obtaining a layer 3 Internet protocol (IP) address information of access routers located adjacent to a previous access router (PAR) to which a mobile node is connected; setting more than one candidate CoAs based on the IP address information of more than one access router, wherein the setting of the more than one candidate CoAs comprises: setting more than one candidate CoAs is based on prefix information included in the IP address information if a Mobile IPv6 protocol is loaded in the mobile node, and setting more than one candidate CoAs based on the router IP address information included in the IP address if a Mobile IPv4 protocol is loaded in the mobile node; and selecting a CoA which is based on a layer 2 IP sub-net information where the mobile node is about to move, and wherein after selecting the CoAs from the more than one candidate CoAs having been set based on the IP address information of more than one access router then performing a handover based on the selected CoA, wherein IP packets are configured to be buffered and forwarded in the layer 3 IP address information, which is configured based on the selected CoA from where the mobile node is about to move, wherein the selected CoA is configured based on the layer 2 IP sub-net information, wherein the selected CoA is configured based on a PoA of a subnet to which the mobile node is about to move, wherein the selected CoA is configured to be determined when the T_PoA is determined in the layer 2 IP sub-net information from the setting of more than one of the candidate CoAs, and wherein the T_PoA is configured based on the subnet to which the mobile node is about to move.