Mobile communication system
First Claim
1. A mobile communication system comprising:
- mobile terminal having means for receiving radio waves from a plurality of base stations;
a home network to which the mobile terminal belongs;
a plurality of subnetworks to which the terminal might move;
advertising routers respectively provided in the subnetworks to advertise information of a pertinent subnetwork to the mobile terminal via the base station; and
a home agent device having means for managing location information of the mobile terminal and registering a routing address to be used temporarily in a subnetwork to which the mobile terminal moves, and means responsive to a movement of the mobile terminal when the routing address is already registered, for capturing a packet addressed to a home address of the mobile terminal in the home network and transferring the captured packet to the subnetwork to which the mobile terminal moves in accordance with the registered routing address, wherein each of said advertising routers comprises means for advertising an interface ID and a prefix section of the routing address from a base station as pertinent subnetwork information, and wherein said mobile terminal comprises a registration unit, and if the terminal has received a plurality of routing addresses having same prefix section and differing in interface ID while moving from the home network to a different subnetwork, then the registration unit combines the plurality of routing addresses into one recognizable routing header address in accordance with a predetermined rule, and registers the routing header address with the home agent device.
1 Assignment
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Accused Products
Abstract
A mobile data communication system capable of shortening the interruption time of communication includes an HA device, advertising routers, base stations, routers, and mobile terminal devices. Each base station advertises an address having “1” set in a different bit of an interface ID of a routing address. When a mobile terminal has received radio waves from a plurality of base stations in the vicinity of a boundary between cells, the mobile terminal combines a plurality of received routing addresses by logical summation and registers a resultant routing address with the HA device. As for a packet delivered from the HA device to the routing address and having “1” in a plurality of bits of the host section, a router resolves the address of the host section into destination addresses each having “1” in one bit, generates packets each having one of resultant addresses, and transmits the generated packets.
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Citations
8 Claims
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1. A mobile communication system comprising:
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mobile terminal having means for receiving radio waves from a plurality of base stations;
a home network to which the mobile terminal belongs;
a plurality of subnetworks to which the terminal might move;
advertising routers respectively provided in the subnetworks to advertise information of a pertinent subnetwork to the mobile terminal via the base station; and
a home agent device having means for managing location information of the mobile terminal and registering a routing address to be used temporarily in a subnetwork to which the mobile terminal moves, and means responsive to a movement of the mobile terminal when the routing address is already registered, for capturing a packet addressed to a home address of the mobile terminal in the home network and transferring the captured packet to the subnetwork to which the mobile terminal moves in accordance with the registered routing address, wherein each of said advertising routers comprises means for advertising an interface ID and a prefix section of the routing address from a base station as pertinent subnetwork information, and wherein said mobile terminal comprises a registration unit, and if the terminal has received a plurality of routing addresses having same prefix section and differing in interface ID while moving from the home network to a different subnetwork, then the registration unit combines the plurality of routing addresses into one recognizable routing header address in accordance with a predetermined rule, and registers the routing header address with the home agent device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification