| 摘要 |
<p>There is disclosed a technique for allowing a mobile terminal to quickly and continuously receive an additional service (e.g., QoS assurance), which was previously received before a handover, after the handover as well. According to the technique, a mobile terminal (MN10) has correspondences between information of access points (AP22,23,32,33) (which comprises the link layer addresses of the APs) and information of access routers (AR21,31) controlling the APs (which includes the link layer addresses of the ARs, the IP addresses of the ARs, the network prefixes and prefix lengths of subnets (20,30) to which the ARs belong, and information as to whether the ARs have additional-service realizing functions as mobility-supported), and produces, with reference to these correspondences, NCoA of a subnet into which the mobile terminal moves. An AR checks, after transmitting the NCoA addressed to the IP address of another AR to which the mobile terminal is handed over and then receiving a massage therefrom, the NCoA and thereafter commences an establishment of an additional service related to the mobile terminal.</p> |
