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Mobile IP communication scheme for supporting mobile computer move over different address spaces
| Details |
Inventors: Inoue, Atsushi; Ishiyama, Masahiro; Fukumoto, Atsushi; Tsuda, Yoshiyuki;
Assignee: Kabushiki Kaisha Toshiba (Kawasaki, JP)
Primary Examiner: Ton; Dang
Assistant Examiner: Nguyen; Brian
Attorney, Agent or Firm: Foley & Lardner
A mobile IP communication scheme for supporting a mobile computer moving over different address spaces is disclosed. A packet relay device for relaying packets having an address of the mobile computer device as a destination or source is provided at a border between a private address space and a global address space, where the packet relay device has a packet receiving unit for receiving a packet in a first format using a global address which is transmitted by the mobile computer for a location registration from a visited site managed by a global address system, and checking a content of the packet, and a packet transfer unit for transferring the packet in a second format using a private address, to a correspondent computer in a home network of the mobile computer managed by a private address system, according to the content of the packet. |
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DETAILED DESCRIPTION It is therefore an object of the present invention to provide a mobile IP communication scheme for a computer system in which a plurality of computers can communicate with each other by being mutually connected through a plurality of inter-connected communication networks where an automatic routing control for the mobile computer is supported by the mobile IP scheme, which is capable of realizing the following mobile computer control.
Namely, in this scheme, a packet such as that of a location registration message originating from the mobile computer that has moved to a region under the address management different from the home network is received once at an entrance of the organization network, and transferred to a corresponding home agent within the organization after checking its content, while the mobile computer side generates and transmits a packet in appropriate format according to its own current location.
Specifically, the present invention provides a mobile computer device, a packet relay device, a mobile computer management device, a packet relay method, a packet transmission method and a packet transfer method for realizing such a mobile IP communication scheme.
According to one aspect of the present invention there is provided 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 inter-connected networks, for relaying packets having an address of the mobile computer device as a destination or source, the packet relay device comprising: a packet receiving unit for receiving a packet in a first format using a global address which is transmitted by the mobile computer for a location registration from a visited site managed by a global address system, and checking a content of the packet; and a packet transfer unit for transferring the packet in a second format using a private address, to a correspondent computer in a home network of the mobile computer managed by a private address system, according to the content of the packet
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