Patent ID: 6944181
Filing Date: 2005-09-13
Classification: H04L,H04W

Abstract:
1. A packet relay device in a network system supporting a mobile computer that is capable of carrying out communications while moving over a plurality of interconnected networks, for relaying packets having an address of the mobile computer as a destination or source, the packet relay device comprising: a packet receiving unit configured to receive a packet in a first format using a global address which is transmitted by the mobile computer for a location registration at a home network from a visited site managed by a global address system which is valid throughout the inter-connected networks, the packet being transmitted by using a global address of the packet relay device, and to check a content of the packet; a packet transfer unit configured transfer the packet in a second format using a private address, to a correspondent computer in the home network of the mobile computer managed by a private address system which is valid only within the home network, according to the content of the packet, the packet being transferred by using a private address of the correspondent computer; a first memory unit configured to store the private address of the packet relay device and the global address of the packet relay device, which are used by the packet receiving unit and/or the packet transfer unit; and a second memory unit configured to store a current location address of the mobile computer at the visited site, and a home address of the mobile computer in the home network, which are used by the packet receiving unit and/or the packet transfer unit.