Hierarchical packet communication system and packet transfer method, as well as handover method and routing node for packet network

摘要

A gate node (21b) reports current position information of a mobile terminal (3a) managed by the gate node (21b) itself to a communicating edge node (EN "3") (93) which routes a packet destined for the mobile terminal (3a) to the gate node (21b). The communicating edge node (EN "3") carries out routing of the packet destined for the mobile terminal (3) to a resident edge node (EN "4") based on the reported cache information in place of the gate node (21b). This achieves high-speed handover and route optimization free from a limitation to a packet transfer route in a packet communication system.