METHOD FOR L3 HANDOVER PATH SETTING TO PROVIDE FLOW-BASED QOS IN MOBILE IPV6 NETWORK

摘要

A method for establishing an L3(layer-3) handover path for flow-based QoS assurance in a mobile IPv6 network is provided to offer an IPv6-based L3 handover service with a guarantee of flow-based QoS even though a mobile terminal moves from a home network to another visited network. A mobile terminal, which has moved to a visited network, acquires a CoA(Care of Address), a new address in the visited network(S530). In order to inform a home agent, which stores the location information of the mobile terminal, of the CoA, the mobile terminal adds a hop-by-hop extended header to a BU(Binding Update) message and transmits it. An access router in the visited network compares the session flow information contained in the hop-by-hop extended header with its own flow cache(S540). If matched, the access router transmits the BU message to a BR(Boundary Router)(S541). Based on the session flow information of the hop-by-hop extended header, the BR confirms whether flow-based QoS can be provided(S550). If resources to provide flow-based QoS are available, the BR constructs its own session flow cache and transmits the BU message to the next router(S551). The next router also confirms whether flow-based QoS can be provided(S560,S570,S580). If so, the next router constructs its own session flow cache and transmits the BU message to the next router(S561,S571,S581). If the BU message is delivered to the home agent, the home agent confirms whether flow-based QoS can be provided(S590). If so, the home agent executes L3 handover processing procedures using the additional information contained int the BU message(S591).