초록 ▼

A roaming service covering a plurality of telecommunications carriers in mobile data communication is provided. In a communication system including a wireless terminal, two or more terminal-side networks communicating with the wireless terminal, and a backbone-side network connected to the terminal-

A roaming service covering a plurality of telecommunications carriers in mobile data communication is provided. In a communication system including a wireless terminal, two or more terminal-side networks communicating with the wireless terminal, and a backbone-side network connected to the terminal-side networks and connecting the wireless terminal with a backbone network, the wireless terminal traveling between the terminal-side networks during communication, wherein each of the terminal-side networks has a relay device for relaying communication between the wireless terminal and the backbone-side network and wherein the backbone-side network has a position management device for managing positional information of the wireless terminal and an authentication device for authenticating the wireless terminal according to contract information of the wireless terminal.

대표청구항 ▼

What is claimed is: 1. A communication system comprising a wireless terminal, a plurality of Internet Service Providers (ISPs, each ISP managing at least one terminal-side network, two or more terminal-side networks communicating with said wireless terminal, and a backbone-side network managed by a

What is claimed is: 1. A communication system comprising a wireless terminal, a plurality of Internet Service Providers (ISPs, each ISP managing at least one terminal-side network, two or more terminal-side networks communicating with said wireless terminal, and a backbone-side network managed by an ISP different from the ISPs managing the terminal-side networks and connected to said terminal-side networks and connecting said wireless terminal with a backbone network, the wireless terminal traveling between said terminal-side networks during communication, wherein each of said terminal-side networks has a relay device for relaying communication between said wireless communication terminal and said backbone-side network, and wherein said backbone-side network has a position management device for managing positional information of said wireless terminal and an authentication device for authenticating said wireless terminal according to contract information of said wireless terminal, wherein each of said terminal-side networks has an authentication data relay device for relaying authentication data in which said wireless terminal requests an authentication from said authentication device, wherein said relay device has an identification-information correspondence information generation device for generating correspondence information between identification information of a network to which said wireless terminal belongs and identification information of said position management device, and wherein said identification-information correspondence information generation device extracts the identification information of the network to which said wireless terminal belongs and the identification information of said position management device from the information transmitted from said position management device to said wireless terminal to generate said identification-information correspondence information, and a path control device for controlling a path of a packet in packet communication of said wireless terminal so that the packet transmitted by said wireless terminal passes through said position management device by referring to said identification-information correspondence information. 2. The communication system according to claim 1, wherein said path control device changes a destination of a packet in packet communication of said wireless terminal so that said packet passes through said position management device by referring to said identification-information correspondence information. 3. The communication system according to claim 1, wherein said position management device transfers the packet transmitted by said wireless terminal and controlled to pass through the position management device to a regular destination. 4. The network system according to claim 1, wherein said identification information is an address complying with IPv6. 5. The network system according to claim 1, wherein said identification information is an address complying with IPv4. 6. A relay device for use in a communication system including a wireless terminal, two or more terminal-side networks communicating with said wireless terminal, a plurality of Internet Service Providers (ISPs), each ISP managing at least one terminal-side network, and a backbone-side network managed by an ISP different from the ISPs managing the terminal-side networks, said backbone-side network being connected to said terminal-side networks and connecting said wireless terminal with a backbone network, which connects said wireless terminal and a backbone network, and a position management device for managing positional information of said wireless terminal, wherein the wireless terminal travels between said terminal-side networks during communication, the relay device relaying communication between said wireless communication terminal and said backbone-side network and installed in said terminal network, comprising an identification-information correspondence information generation device, wherein said identification-information correspondence information generation device extracts the identification information of the network to which said wireless terminal belongs and the identification information of said position management device from information transmitted from said position management device to said wireless terminal, and generates correspondence information between identification of the network to which said wireless terminal belongs and identification of said position management device; and a path control device for controlling a path of a packet in packet communication of said wireless terminal so that the packet transmitted by said wireless terminal passes through said position management device by referring to said identification-information correspondence information. 7. The relay device according to claim 6, wherein said path control device changes a destination of a packet in packet communication of said wireless terminal so that said packet passes through said position management device by referring to said identification-information correspondence information. 8. The relay device according to claim 6, wherein said identification information is an address complying with IPv6. 9. The relay device according to claim 6, wherein said identification information is an address complying with IPv4.