Packet communication system, communication network, and method for selecting IP address in mobile node
AssigneeHitachi, Ltd.
InventorsMariko Yamada, Masashi Yano, Akira Date, Takumi Oishi
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Abstract
The invention provides a method for selecting a communication IP address whereby traffic of a network can be reduced and a session with the partner of communication can be maintained even when the mobile node has moved. The method prescribes provision of means for judging a state of a foreign network to which the mobile node is connected, and means of monitoring an IP address that an application having been started by the mobile node is using for communication, and enables selection of the mobile IP address so that the mobile node can maintain the session surely even in a visited foreign network.
Claims12
A packet communication system comprising first and second packet communication devices that are arranged in at least first and second foreign networks, respectively, among a plurality of foreign networks existing as networks visited by the mobile node, wherein
- when the mobile node has moved to the first foreign network, a first care-of address is given to the mobile node, when the mobile node has moved to the second foreign network, a second care-of address is given to the mobile node, and after the mobile node has moved from the first foreign network to the second foreign network, when a packet addressed to the first care-of address is transmitted, the first packet communication device forwards the packet to the second packet communication device.
A packet communication system comprising packet communication devices that are arranged in a plurality of foreign networks, respectively, that are at least part of foreign networks existing as networks visited by a mobile node, wherein
- when the mobile node moved among the plurality of foreign networks, if the packet communication device is arranged in a visited foreign network, the mobile node is given a care-of address that corresponds to the visited foreign network one by one, and
- the mobile node continuously sends information pertinent to the care-of address given in the visited foreign network after moving to a plurality of foreign networks from the predetermined foreign network to at least one of the packet communication devices arranged in the foreign networks in which the mobile node resided previously.
A communication network comprising first and second packet communication devices that are arranged in at least first and second foreign networks, in a corresponding manner, among a plurality of foreign networks existing as networks visited by a mobile node, wherein
- when the mobile node has moved to the first foreign network, a first care-of address is given to the mobile node,
- when the mobile node has moved to the second foreign network, a second care-of address is given to the mobile node, and
- after the mobile node has moved from the first foreign network to the second foreign network, when a packet addressed to the first care-of address is transmitted, the packet is forwarded from the first packet communication device to the second packet communication device.
A communication network comprising packet communication devices that are arranged in a plurality of foreign networks, respectively, that are at least part of foreign networks existing as networks visited by a mobile node, wherein
- when the mobile node moved among the plurality of foreign networks, if the packet communication devices are arranged in the visited foreign networks, a care-of address corresponding to each of the visited foreign networks is given to the mobile node one by one, and
- after moving further from a predetermined foreign network to a plurality of foreign networks, information pertinent to the care-of address given by the visited foreign network is continuously sent from the mobile node to at least one of the packet communication devices each of which is arranged on each of foreign networks in which the mobile node resided previously.
A method for selecting an IP address in a mobile node comprising the steps of:
- arranging first and second packet communication devices in at least first and second foreign networks, in a corresponding manner, among a plurality of foreign networks existing as networks visited by the mobile node;
- giving a first care-of address to the mobile node when the mobile node has moved to the first foreign network and a second care-of address to the mobile node when the mobile node has moved to the second foreign network, respectively;
- and
- after the mobile node moved from the first foreign network to the second foreign network, when a packet addressed to the first care-of address is transmitted to the first foreign network, forwarding the packet to the second packet communication device from the first packet communication device.
A method for selecting an IP address in a mobile node comprising the steps of:
- arranging packet communication devices in a plurality of foreign networks that are at least part of foreign networks existing as networks visited by the mobile node, respectively;
- when the mobile node moves among the plurality of foreign networks, if the packet communication device is arranged in a visited foreign network, giving the mobile node a care-of address that corresponds to the visited foreign network one by one;
- and
- after the mobile node moved further from a predetermined foreign network to a plurality of foreign networks, sending information pertinent of the care-of address given in a visited foreign network continuously from the mobile node to at least one of the packet communication devices each of which is arranged in each of foreign networks in which the mobile node resided previously.
Dependencies are inferred from the claim text.