JP2003092597A5

JP2003092597A5 -

Info

Publication number: JP2003092597A5
Application number: JP2002055169A
Authority: JP
Filing date: 2002-03-01
Publication date: 2005-08-25
Anticipated expiration: 2022-03-01

Claims

A terminal having means for receiving radio waves from a plurality of base stations; a home network to which the terminal belongs; a plurality of sub-networks to which the terminal is moved;
In each subnetwork, an advertising router that advertises information of the subnetwork to the terminal via the base station;
Means for managing the location information of the terminal and registering a routing address which is an address temporarily used in a movement destination sub-network of the terminal; and when the terminal is moved and the routing address is registered, A home agent device comprising: means for capturing a packet addressed to the terminal that has arrived at a home address that is a destination in the home network of the terminal, and transferring the packet to the destination subnetwork according to the registered routing address Prepared,
The advertising router includes means for advertising the interface ID and prefix portion of the routing address from the base station as the subnetwork information,
When the terminal moves to the subnetwork and receives a plurality of routing addresses having the same prefix part and different interface IDs, the terminal combines the plurality of routing addresses into one routing header address, A mobile communication system comprising means for registering with the home agent device.

The mobile communication system according to claim 1, wherein
A different bit is assigned to the Interface ID for each subnetwork,
The advertising router includes means for transmitting the subnetwork information including a routing address in which a bit assigned to each subnetwork is set to “1”.
The terminal calculates a logical sum of the interface IDs of the routing addresses included in the received plurality of subnetwork information when the prefix portions of the routing addresses included in the received plurality of subnetwork information match, and calculates A mobile communication system comprising means for setting a result as the synthesized routing header address.

The mobile communication system according to claim 2, wherein
The home agent device
Means for storing a combination of the care-of address sent from the terminal, the routing header address, and the home address of the terminal;
Means for setting the care-of address as a routing header address of a packet sent to the home address of the terminal;
Means for encapsulating a packet in which the care-of address is set, and setting the routing header address as a destination address;
A mobile communication system comprising means for sending the encapsulated packet.

The mobile communication system according to claim 1, wherein
The router in the mobile communication network is
A packet in which the routing header address received from the home agent device is set as a destination address, and one bit of the Interface ID is “1” from a packet in which “1” is set in a plurality of bits of the Interface ID. Means to generate and send a packet with a recipient address set to, or
The advertisement that advertises an address in which any one bit of the Interface ID is set to “1” for a packet having the same prefix as the routing address of the subnetwork information advertised by the advertising router. A mobile communication system comprising a routing table configured to be transferred to a router.

The mobile communication system according to claim 1, wherein
A part of the prefix part of the subnetwork information advertised by the advertising router is used as a subnetwork instruction bit, and a different bit is assigned to each subnetwork.
The base station in the sub-network comprises means for transmitting sub-network information with the assigned bit set to “1”,
The terminal calculates a logical sum of the prefix portions of the received plurality of subnetwork information when the portions of the received prefix portions of the plurality of subnetwork information match the portion excluding the subnetwork instruction bit portion. A means for generating a care-of address with the operation result as a prefix part and registering it in the home agent device is provided,
When a plurality of subnetwork instruction bits of a destination address of a packet to be transferred are set to “1”, a router in the mobile communication network sets any one bit of the subnetwork instruction unit to “1”. A mobile communication system comprising a routing table that is set to be transferred to an advertising router that advertises a set address as a prefix part of subnetwork information.

The mobile communication system according to claim 1, wherein
A plurality of routers for transferring the packets in the mobile communication network;
The advertising router in each subnetwork comprises means for advertising main subnetwork information for forwarding packets into the subnetwork and subnetwork information including subsubnetwork information,
When the terminal receives the subnetwork information from one base station, the terminal receives the subnetwork information from a plurality of base stations and means for generating a care-of address based on the main subnetwork information. Means for generating a care-of address based on the prefix part, and means for transmitting the generated care-of address to the home agent device if the prefix parts of the plurality of sub-subnetwork information received are equal. With
The router that forwards the packet includes a routing table that is set so that a packet having a prefix portion of the sub-subnetwork information is multicast-routed to each base station that is transmitting the sub-subnetwork information. Body communication system.

The mobile communication system according to claim 4 or claim 5 or claim 6,
A mobile communication system, wherein the terminal includes means for receiving and processing packets addressed to a plurality of care-of addresses.

The mobile communication system according to claim 5 is:
A plurality of routers for transferring the packets in the mobile communication network;
Any of the routers creates a routing table based on the routing information received from other routers and the routing information of its own router, and exchanges routing information between other routers;
If the routing information of the own router or received from other routers matches the part of the subnetwork information advertised by the advertising router excluding the subnetwork instruction part, the matching multiple A mobile communication system comprising means for adding a logical sum calculation result of the prefix part of the subnetwork information to the routing table.

A transceiver that receives data including the first address from the first router, receives data including the second address from the second router, and transmits data including the third address;
A communication terminal having a control unit that creates the third address from a part or all of the first address and part or all of the second address.

The communication terminal according to claim 9, wherein
The control unit calculates a logical sum of a part or all of the first address and a part or all of the second address, and uses the calculation result as a part or all of the address. A communication terminal characterized by creating an address.

Receiving data having a first address including a plurality of bits having a value of 1 in a predetermined area as a transmission destination address, transmitting data having the second address as a transmission destination to the first data transfer device; A transmission / reception unit for transmitting data having the address of the transmission destination to the second data transfer device;
Of the bits included in the first address, the bits in the predetermined area other than the first bit are converted to 0 as the second address, and among the bits included in the first address, A data transfer device comprising: a control unit having a third address obtained by converting bits in the predetermined area other than the second bit into 0.

The data transfer device according to claim 11, wherein
The data transfer apparatus according to claim 1, wherein a logical sum of the predetermined area of the second address and the predetermined area of the third address is the predetermined area of the first address.

A server connected to the terminal and the first and second data transfer devices,
Data including a third address created from a first address received by the terminal from the first data transfer device and a second address received by the terminal from the second data transfer device; A transceiver that receives from the terminal;
A server having a storage unit in which the home address, care-of address, and third address of the terminal are stored in association with each other.

The server according to claim 14, wherein the server is a home agent of the terminal.

The server according to claim 13 or 14,
The server according to claim 3, wherein the third predetermined area is a logical sum of the predetermined area of the first address and the predetermined area of the second address.