JP2001197099A - Device and method for information processing and recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the discarding of packets as much as possible. SOLUTION: A router 18 decides whether or not a position indicator before the movement of a terminal device 11 is included in a binding update packet and also decides whether or not a transfer destination corresponding to the current position of the terminal device 11 is the same as a transfer destination corresponding to the position before the movement of the terminal device 11. When it is decided that the binding update packet includes the position identifier before the movement and decided that the transfer destination corresponding to the current position of the terminal device 11 is not the same as the transfer destination corresponding to the position before the movement of the terminal device 11, the router 18 stores the current position indicator and the position indicator before the movement. The router 18 rewrites the position indicator before the movement included in the packet to the current position indicator.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an information processing apparatus and method, and a recording medium, and more particularly to an information processing apparatus and method for transferring data and a recording medium.

[0002]

2. Description of the Related Art With the spread of portable personal computers in recent years, users of personal computers can carry personal computers. In addition, it has become possible to not only carry the portable personal computer but also connect the portable personal computer to a destination network and receive services via the network.

[0003] In such a so-called mobile computing environment, it is premised that a node which is a device (personal computer) connected to a network and receiving a service moves. Such a node
Even if the position of the node changes, communication must be continued.

At present, IPv6 (Internet Protocol version)
Based on the standard of 6), Mobi as a method of node communication in mobile computing environment in IPv6
le IPv6 has been proposed.

In Mobile IPv6, a node has two IP addresses, a home address and a care-of address. The care-of address changes in accordance with the connected sub-network as the node moves. The home address is constant regardless of movement. By specifying the home address of the moving node, the communication partner node can communicate with the moving node regardless of the position of the moving node (connected subnetwork).

The home agent is a node connected to a subnetwork corresponding to the home address of the node. When the node moves, the home agent receives a binding update packet including a new care-of address from the moved node, and And update the binding cache that stores the correspondence between the care-of address. Also, the home agent announces path information corresponding to the home address of the moving node to the network.

FIG. 1 is a diagram for explaining a procedure for registering a care-of address. When the terminal device 1 as a node moves, the terminal device 1 acquires a care-of address from a subnetwork to which the terminal device 1 has moved. The terminal device 1 has a home address,
Bi including the care-of address and the authentication data of the terminal device 1
A nding update packet is generated and transmitted to the home agent 2.

FIG. 2 is a diagram illustrating the format of an IPv6 header of an IPv6 packet. As shown in FIG. 2, the IPv6 header includes a 4-bit protocol version, an 8-bit traffic class for recognizing and distinguishing the priority, and a 20-bit for identifying a packet requiring execution of a special operation by a router. Bit flow labels etc. are arranged,
A source address, which is the address of the node that transmitted the packet, a destination address, which is the address of the node that receives the packet, and an optional extension header are arranged.

Hereinafter, an IPv6 packet is also simply referred to as a packet.

FIG. 3 is a diagram showing a format of an IPv6 address. The upper 64 bits of the IPv6 address are path information, and the lower 64 bits are an interface identifier for identifying a network interface of the node in a sub-network connected to the node. The interface identifier is unique within the subnetwork, and a MAC address or the like is used as the interface identifier. Hereinafter, an IPv6 address is also simply referred to as an address.

FIG. 4 is a view for explaining a conventional binding update packet. In the source address of the IPv6 header,
The care-of address of the terminal device 1 is set, and the address of the home agent is set as the destination address.

The extension header stores, as a destination header, the home address of the terminal device 1 and data indicating that this packet is an update, and further stores an authentication header.

FIG. 5 is a diagram for explaining an authentication header.
The authentication header includes an SPI (Security Parameters Index), a sequence number, authentication data, and the like. As shown in FIG. 6, the home agent 2 determines the SA (Security Assy) based on the destination address and the SPI of the authentication header.
association) to determine an authentication key or an encryption method.

The home agent 2 executes a binding update
Upon receiving the packet, it is determined whether the authentication data is correct. If the authentication data is determined to be correct, the binding data is determined.
Register the care-of address included in the received binding update packet in the cache. Home Agent 2
A response packet is transmitted to the terminal device 1.

Next, a conventional procedure for transmitting a packet to the terminal device 1 in which the terminal device 3 moves will be described with reference to FIG. The terminal device 3 indicates the host name of the terminal device 1 and a domain name server (Domain Name Server) 4
Is inquired about the home address of the terminal device 1. Since the domain name server 4 stores the correspondence between the host name and the home address as shown in FIG. 8, the domain name server 4 searches for the home address of the terminal device 1 based on the host name, and sends a reply to the terminal device 3. . The terminal device 3 generates and transmits a packet as shown in FIG. 9 in which the home address of the terminal device 1 is set as the destination address.

The packet transmitted by the terminal device 3 is based on the route information that the home agent 2 has announced.
The home agent 2 is reached. As shown in FIG. 10, the home agent 2 adds the IPv6 header in which the care-of address of the terminal device 1 is set to the destination address to the received packet, and transmits the packet. This packet is
The terminal device 1 is reached according to normal route control. The terminal device 1 obtains the original packet by removing the IPv6 header added by the home agent 2 from the received packet.

The terminal device 1 generates a bindingupdate packet including the authentication header and the care-of address of the terminal device 1 and transmits the binding update packet to the terminal device 3 to notify the terminal device 3 of the care-of address of the terminal device 1. The terminal device 3 is binding up
When the date packet is received, the authentication data is inspected, and if it is determined to be correct, the care-of address of the terminal device 1 is registered in the binding cache. The terminal device 3 transmits an acknowledgment packet to the terminal device 1.

As shown in FIG. 11, in the packet transmitted from the terminal device 1 to the terminal device 3, the care-of address of the terminal device 1 is set as the source address, and the home address is stored in the destination options header of the extension header. Is done. This packet reaches the terminal device 3 via an optimal route.

After receiving the binding update packet,
The packet transmitted from the terminal device 3 to the terminal device 1 is as shown in FIG.
As shown in (1), a routing header is added, and the terminal device 1 reaches the terminal device 1 via an optimal route.

When the terminal device 1 moves in this state, the terminal device 1 transmits a new care-of address to the terminal device 3 and the home agent 2. The terminal device 3 holds the correspondence between the home address of the terminal device 1 and the care-of address as a binding cache, similarly to the home agent 2. The terminal device 1 periodically transmits a binding update packet to the home agent 2 and the terminal device 3 to cause the terminal device 3 to update the binding cache.

FIG. 13 shows the operation when the terminal device 1 moves.
This will be described with reference to FIG. The terminal device 1 obtains a care-of address from the destination sub-network. The terminal device 1
Bi including the home address of the terminal device 1 shown in FIG.
A nding update packet is generated and transmitted to the terminal device 3. Upon receiving the binding update packet, the terminal device 3 determines whether or not the authentication data stored in the binding update packet is correct. If the authentication data is determined to be correct, the terminal device 3 stores the terminal stored in the binding update packet. The care-of address of the device 1 is registered in the binding cache. The terminal device 3 returns an acknowledgment packet to the terminal device 1.

The terminal device 1 generates a bindingupdate packet including the home address of the terminal device 1 shown in FIG. When the home agent 2 receives the binding update packet,
It is determined whether the authentication data stored in the nding update packet is correct. If the authentication data is determined to be correct, the care-of address of the terminal device 1 stored in the binding update packet is registered in the binding cache. Home agent 2 returns an acknowledgment packet to terminal device 1.

[0023]

However, when the terminal device 1 moves, the terminal device 1 transmits a binding update packet, transmits a care-of address of the destination, and notifies the destination. Until the binding cache is updated, the terminal device 3 sets the care-of address before the terminal device 1 moves to the destination and transmits the packet. Therefore, the packet in which the care-of address before the terminal device 1 moves is set as the destination does not reach the terminal device 1,
It will be destroyed.

The present invention has been made in view of such a situation, and has as its object to reduce the number of packets discarded.

[0025]

According to a first aspect of the present invention, there is provided an information processing apparatus for notifying a position including a first data for specifying a current position of a terminal device connected on a network. Receiving means for receiving the first packet, and first determining means for determining whether or not the first packet received by the receiving means includes second data for specifying the position of the terminal device before movement. It is determined whether the transfer destination when transferring the second packet for data transfer addressed to the terminal device to the current position is the same as the transfer destination when transferring the second packet to the position before the movement. The second determination unit and the first determination unit determine that the first packet includes the second data, and the second determination unit sends the first packet to the current position of the terminal device. Destination of the second packet and the movement of the terminal device If it is determined that the transfer destination of the second packet is not the same as the destination of the second packet, storage means for storing the first data and the second data in association with each other, and a second address as the destination address When the second packet in which the data of the second packet is set is received, the second data set as the transmission destination address in the second packet is stored in the first packet based on the correspondence stored in the storage means. And rewriting means for rewriting data.

According to a second aspect of the present invention, there is provided an information processing method for receiving a first packet for notifying a position including first data for specifying a current position of a connected terminal device on a network. A receiving step, a first determining step of determining whether the first packet received in the processing of the receiving step includes second data for specifying a position of the terminal device before movement, A second determination that determines whether the transfer destination when transferring the second packet for data transfer to the current location is the same as the transfer destination when transferring the second packet to the location before the movement. The step and the first determining step determine that the first packet contains the second data, and the second determining step addresses the current position of the terminal device. Second packet in case When it is determined that the transfer destination is not the same as the transfer destination of the second packet when addressed to the position before the movement of the terminal device, the first data and the second data are stored in association with each other. If a step and a second packet having the second data set as the destination address are received, the second packet is set as the destination address based on the correspondence stored in the processing of the storage step. Rewriting the set second data to the first data.

[0027] According to a third aspect of the present invention, the program of the recording medium includes, in a first packet for notifying the position, including first data for specifying the current position of the terminal device connected on the network, First to determine whether or not the second data for specifying the position of the terminal device before movement is included
And a second step for data transfer to the terminal device.
Destination for forwarding the packet to the current location,
The second packet is included in the first packet by the processing of the second determination step for determining whether or not the transfer destination when transferring to the position before the movement is the same and the first determination step. And the destination of the second packet when the packet is addressed to the current position of the terminal device and the second packet when the packet is addressed to the position before the movement of the terminal device by the processing of the second determination step. If it is determined that the transfer destination of the second packet is not the same, the storing step of storing the first data and the second data in association with each other, and the second step in which the second data is set as the transmission destination address Rewriting step of rewriting the second data set as the transmission destination address in the second packet to the first data based on the correspondence stored in the processing of the storage step when the second packet is received Including And wherein the door.

[0028] The information processing apparatus according to claim 1, and claim 2.
In the information processing method according to the first aspect and the recording medium according to the third aspect, the first information for notifying the position includes first data for specifying the current position of the terminal device connected on the network. It is determined whether or not the second packet for specifying the position of the terminal device before the movement is included in the packet of the terminal device, and the second packet for data transfer addressed to the terminal device is transferred to the current position. It is determined whether or not the transfer destination is the same as the transfer destination when transferring to the position before the movement, the first packet is determined to include the second data, and the terminal device If it is determined that the transfer destination of the second packet addressed to the current position of the terminal device and the transfer destination of the second packet addressed to the position before the movement of the terminal device are not the same, the first The data and the second data are stored in association with each other, When a second packet in which the second data is set as the destination address is received, the second data set as the destination address in the second packet based on the stored correspondence relationship Is rewritten to the first data.

[0029]

FIG. 16 is a diagram showing an embodiment of the network system of the present invention. In the network system shown in FIG. 16, nodes constituting the network execute communication based on the mobile-oriented IPv6 address and VIPv6.

As shown in FIG. 17, the mobile-oriented IPv6 address is made up of 128 bits, and is a node identifier (lower 64 bits) for uniquely identifying a node on the Internet 15.
Bit), and the sub-networks 19-1 to 19-7 and the radio sub-network 1 to which the node is connected
It consists of a position indicator (upper 64 bits) indicating any of 7-1 to 17-4.

The node identifier identifies the node itself, such as the terminal device 11, and is used for recognition or authentication of the node without changing its value due to the position or movement of the node. The locator is the subnetwork 1
9-1 to 19-7 and wireless sub-network 17-
It is used to transmit a packet to a node connected to any of 1 to 17-4.

The upper 64 bits of the mobility-oriented IPv6 address play the same role as the upper 64 bits of the IPv6 address proposed by the Internet Engineering Task Force (IETF). As a result, the routing control mechanism in the IP layer can be used as it is.

VIPv6 is a network architecture that provides, based on a mobile-oriented IPv6 address, mobility between nodes where communication is continuously performed irrespective of the position or movement of each node, and verification of a moving node. It is. In VIPv6, mobile-oriented IPv6 is used as an IPv6 address.
In addition to using 6 addresses, it has a VIP function to realize mobility transparency and authentication of moving nodes.

FIG. 18 is a diagram showing the configuration of a protocol layer in VIPv6. The protocol layer in VIPv6 is
It consists of an application layer, TCP / UDP layer, VIP layer, IP layer, data link layer, and physical layer.

In the application layer and the TCP / UDP layer, a node is identified by using a node identifier arranged in lower 64 bits of a mobile-oriented IPv6 address. TC
In the P / UDP layer and the VIP layer inserted between the IP layers,
The locator corresponding to the node identifier is combined to form 12
An 8-bit mobile-oriented IPv6 address is generated.

In the IP layer, a packet is transmitted based on the mobile-oriented IPv6 address generated in the VIP layer.

On the other hand, when a packet is received, in the VIP layer, the locator is removed from the mobile-oriented IPv6 address, and only the node identifier is stored in the application layer.
Passed to the TCP / UDP layer.

Returning to FIG. 16, the terminal device 11
When located in the wireless sub-network 17-1 of the 6-1, it communicates with the base station 16-1 via radio and communicates with the router 18-5, the sub-network 19-4, and the router 18-
3. Connect to the Internet 15 via the sub-network 19-2, the router 18-2, the sub-network 19-1, and the router 18-1.

When the terminal device 11 is located in the wireless sub-network 17-2 of the base station 16-2, it communicates with the base station 16-2 via radio, and communicates with the router 18-6 and the sub-network 19-. 5, router 18-3, subnetwork 19-2, router 18-2, subnetwork 19
-1 and the Internet 15 via the router 18-1.

When the terminal device 11 is located in the radio sub-network 17-3 of the base station 16-3, it communicates with the base station 16-3 via radio, and communicates with the router 18-7 and the sub-network 19-. 6, router 18-4, sub-network 19-3, router 18-2, sub-network 19
-1 and the Internet 15 via the router 18-1.

When the terminal device 11 is located in the radio sub-network 17-4 of the base station 16-4, it communicates with the base station 16-4 via radio, and communicates with the router 18-8 and the sub-network 19-. 7, router 18-4, subnetwork 19-3, router 18-2, subnetwork 19
-1 and the Internet 15 via the router 18-1.

The home agent 12-1 stores the correspondence between the node identifier of the terminal device 11 and the position indicator. The home agent 12-2 stores the correspondence between the node identifier of the terminal device 11 and the position indicator.

The terminal device 13 is connected to the Internet 15 and is connected to the terminal device 11 via the Internet 15 or the like.
Communicate with

The domain name server 14 stores a node identifier and a home location indicator, or a node identifier, home agents 12-1 and 12-1 in correspondence with the host name.
2-2 is stored. The home position indicator is a sub-network 19 to which the terminal device 11 is normally connected.
-1 to 19-7, or a position indicator corresponding to any of sub-networks not shown. On the other hand, the current position indicator is a position indicator corresponding to any of the wireless sub-networks 17-1 to 17-4 to which the terminal device 11 is currently connected.

The base station 16-1 forms a radio subnetwork 17-1, communicates with the terminal device 11 located in the radio subnetwork 17-1 via radio, and transmits a packet transmitted by the terminal device 11. It receives and supplies the received packet to the router 18-5, and the router 18-
Then, the packet addressed to the terminal device 11 input from 5 is transmitted to the terminal device 11.

The base station 16-1 supplies the terminal device 11 located in the radio sub-network 17-1 with a position indicator corresponding to the radio sub-network 17-1.

The base station 16-2 forms a radio sub-network 17-2, communicates with the terminal device 11 located in the radio sub-network 17-2 via radio, and transmits a packet transmitted by the terminal device 11. It receives and supplies the received packet to the router 18-6, and the router 18-
The packet addressed to the terminal device 11 input from 6 is transmitted to the terminal device 11.

The base station 16-2 supplies the terminal device 11 located in the radio sub-network 17-2 with a position indicator corresponding to the radio sub-network 17-2.

The base station 16-3 forms a radio sub-network 17-3, communicates with the terminal device 11 located in the radio sub-network 17-3 via radio, and transmits a packet transmitted by the terminal device 11. It receives and supplies the received packet to the router 18-7, and the router 18-
The packet addressed to the terminal device 11 input from the terminal 7 is transmitted to the terminal device 11.

The base station 16-3 supplies the terminal device 11 located in the radio sub-network 17-3 with a position indicator corresponding to the radio sub-network 17-3.

The base station 16-4 forms a radio sub-network 17-4, communicates with the terminal device 11 located in the radio sub-network 17-4 via radio, and transmits a packet transmitted by the terminal device 11. It receives and supplies the received packet to the router 18-8, and the router 18-
Then, the packet addressed to the terminal device 11 input from 8 is transmitted to the terminal device 11.

The base station 16-4 supplies the terminal device 11 located in the radio sub-network 17-4 with a position indicator corresponding to the radio sub-network 17-4.

Since the base stations 16-1 to 16-4 communicate with a plurality of terminal devices, the radio sub-network 17-1
To 17-4 form a sub-network via radio.

Each of the routers 18-1 to 18-8 stores a position indicator or the like corresponding to the node identifier, and stores the terminal device 11, the terminal device 13, the home agent 12-1 or 12-2, or the domain agent. The path through which the packet supplied from the name server 14 is transmitted is controlled.

Hereinafter, when it is not necessary to distinguish between home agents 12-1 and 12-2, they will be simply referred to as home agent 12.

Hereinafter, when it is not necessary to individually distinguish the base stations 16-1 to 16-4, they are simply referred to as base stations 16.
Hereinafter, when it is not necessary to individually distinguish the wireless sub-networks 17-1 to 17-4, they are simply referred to as the wireless sub-network 17.

Hereinafter, when it is not necessary to individually distinguish the routers 18-1 to 18-8, they are simply referred to as routers 18.
Hereinafter, when it is not necessary to individually distinguish the sub-networks 19-1 to 19-7, they are simply referred to as a sub-network 19.

FIG. 19 is a diagram for explaining the configuration of the terminal device 11. CPU (Central Processing Unit) 31
Are various application programs and OS (Operat
ing System). ROM (Read-only Mem
The ory) 32 generally stores basically fixed data of a program used by the CPU 31 and calculation parameters. RAM (Random-Access Memory) 33
Are programs used in the execution of the CPU 31,
The parameters that change appropriately in the execution are stored.
These are a host bus 34 composed of a CPU bus and the like.
Are connected to each other.

The host bus 34 is connected via a bridge 35 to a PCI (Peripheral Component Interconnect / Inter
face) and an external bus 36 such as a bus.

The keyboard 38 is operated by the user when inputting various commands to the CPU 31. The pointing device 39 is operated by a user when pointing or selecting a point on the screen of the display 40. The display 40 includes a liquid crystal display device or the like,
Displays various information as text or images. HDD (Ha
The rd Disk Drive 41 drives a hard disk and records or reproduces a program or information executed by the CPU 31 on the hard disk.

The drive 42 reads data or programs (including programs executed by the communication unit 43) recorded on the mounted magnetic disk 61, optical disk 62, magneto-optical disk 63, or semiconductor memory 64, The data or the program is supplied to the RAM 33 or the communication unit 43 connected via the interface 37, the external bus 36, the bridge 35, and the host bus 34. The keyboard 38 to the drive 42 are connected to the interface 37.
The interface 37 includes an external bus 36, a bridge 3
5 and the CPU 31 via the host bus 34.

The communication unit 43 communicates with the base station 16 and
The data supplied from the U31 or the HDD 51 is stored in a packet of a predetermined format and transmitted to the base station 16, and the data stored in the packet received from the base station 16 is transferred to the CPU 31, the RAM 33, or the HDD 31.
41.

The communication unit 43 includes an external bus 36, a bridge 3
5 and the CPU 31 via the host bus 34.

Home agents 12-1 and 12-
2. Terminal device 13 and domain name server 14
Has a configuration similar to that of the terminal device 1, and a description thereof will be omitted.

FIG. 20 is a diagram for explaining the configuration of the router 18-1. The CPU 81 actually executes a predetermined program. The ROM 82 generally stores basically fixed data of programs executed by the CPU 81 and calculation parameters. The RAM 83 includes a CPU 81
And the parameters that change as appropriate during the execution.

The drive 85 includes the mounted magnetic disk 111, optical disk 112, and magneto-optical disk 11.
3 or the data or the program (including the program executed by the communication unit 86 or 87) recorded in the semiconductor memory 114 is read out, and the data or the program is read out from the RA connected via the bus 84.
M83, the communication unit 86, or the communication unit 87.

The communication unit 86 is connected to the Internet 15, stores data supplied from the CPU 81 or the communication unit 87 in a packet of a predetermined format, transmits the packet via the Internet 15, and transmits the data via the Internet 15.
5, the data stored in the received packet is output to the CPU 81 or the communication unit 87.

The communication section 87 has a sub-network 19-1.
Is connected, the data supplied from the CPU 81 or the communication unit 86 is stored in a packet of a predetermined method, transmitted via the sub-network 19-1, and received via the sub-network 19-1. The data stored in the packet is output to the CPU 81 or the communication unit 86.

The CPU 81 to the communication section 87 are mutually connected by a bus 84.

The configuration of the routers 18-2 to 18-8 is the same as that of the router 18-1, and a description thereof will be omitted.

Next, a first embodiment of the present invention will be described.

The terminal device 13 according to the first embodiment
The procedure for transmitting a packet to the moving terminal device 11 will be described with reference to FIG. The terminal device 13 indicates the host name of the terminal device 11 via the Internet 15 and inquires of the domain name server 14 about the home position indicator and the node identifier of the terminal device 11.
As shown in FIG. 22, the domain name server 14 stores the home locator and the node identifier corresponding to the host name.
Read the node identifier and the home position indicator of
The terminal device 11 read out via the Internet 15
Terminal identifier and home location indicator of the terminal device 13
Send to

The terminal device 13 sets the address obtained by combining the home position indicator and the node identifier of the terminal device 11 as the destination address, and sets the address of the terminal device 13 as the source address. Generate and transmit via the Internet 15.

The packet transmitted by the terminal device 13 reaches the home agent 12 based on the route information announced by the home agent 12. The home agent 12 sends the home position indicator of the destination address of the received packet to the terminal device 11 as shown in FIG.
Is rewritten to the current position indicator and transmitted via the Internet 15. The packet transmitted by the home agent 12 is transmitted to the Internet 1 according to the normal route control.
5. The terminal device 11 is reached via the routers 18-1 to 18-8 and the sub-networks 19-1 to 19-7.

The terminal device 11 generates a binding update packet containing the authentication header and the current position indicator of the terminal device 11 in the source address shown in FIG. 25, and the Internet 15 and the routers 18-1 to 18-. 8 and the sub-networks 19-1 to 19-7 to the terminal device 13 to notify the terminal device 13 of the current position indicator of the terminal device 11. The terminal device 13 is a binding upda
When the te packet is received, as shown in FIG. 26, the SA is determined based on the node identifier of the destination address and the SPI of the authentication header, and the authentication key or the encryption method is determined. Execute the processing of If it is determined that the authentication data is correct, the terminal device 13 replaces the current position indicator of the terminal device 11 stored in the binding update packet with
Register in bindingcache.

The packet transmitted from the terminal device 13 to the terminal device 11 after the above communication processing has been executed is as shown in FIG.
Similarly to the packet shown in FIG. 4, since the current position indicator and the node identifier of the terminal device 11 are set in the transmission destination address, the terminal device 11 reaches the terminal device 11 through an optimal route.

Next, the process of transmitting a packet to the moving terminal device 11 by the terminal device 13 in the first embodiment will be described with reference to the flowchart of FIG. In step S11, the terminal device 13 indicates the host name of the terminal device 11, and requests the domain name server 14 for the home position identifier and the node identifier of the terminal device 11. In step S12, the name server 12 transmits the home position identifier and the node identifier of the terminal device 11 to the terminal device 13.

In step S13, the terminal device 13
Combines the received home location identifier and node identifier to generate an IPv6 address. In step S14, the terminal device 13 transmits a packet to the home agent 12 based on the IPv6 address generated in step S13.

In step S15, the home agent 12 rewrites the home position indicator of the terminal device 11 set in the destination address of the received packet to the current position indicator of the terminal device 11, and transfers the relocated home position indicator. In step S16, the terminal device 11 receives the transferred packet.

In step S17, the terminal device 11
Is the bindin that sets the current position indicator in the terminal device 13.
g Send an update packet. In step S18, the terminal device 13 receives the binding update packet.

In step S19, the terminal device 13
Determines whether or not the authentication data of the binding update packet received in the process of step S18 is correct. If the authentication data is determined to be correct, the process proceeds to step S20.
The current position indicator of the terminal device 11 is registered in the binding cache. In step S21, the terminal device 13 transmits a packet to the terminal device 11 based on the current position indicator of the terminal device 11, and the process ends.

If it is determined in step S19 that the authentication data is not correct, the current position indicator contained in the binding update packet is also incorrect.
20 and step S21 are skipped and the binding ca
The process ends without changing che.

As described above, the terminal device 13 is the terminal device 1
1 can be transmitted.

Next, a second embodiment of the present invention will be described. The second embodiment is different from the first embodiment in that a plurality of home agents (for example, home agents 12-1 and 12-2) are associated with one terminal device 11, The domain name server 14 corresponds to the host name of the terminal device 11, the node identifier of the terminal device 11, and 1 corresponding to the terminal device 11.
The point that the IPv6 address of the home agent 12 is stored and the bit that the binding update packet requests the home agent 12, the terminal device 13, or the router 18 to register two or more current position indicators (hereinafter, referred to as a bit) (Referred to as S bit).

The terminal device 13 stores two or more current position indicators corresponding to the terminal device 11,
When a packet is transmitted to, a packet in which two or more stored current position indicators are set is generated and transmitted.

First, the operation in which the terminal device 11 notifies the home agent 12 of the current position indicator in the second embodiment will be described with reference to FIG. Terminal device 11
Has moved, the terminal device 11 acquires a position indicator corresponding to the destination wireless sub-network 17 from the base station 16 forming the destination wireless sub-network 17. The terminal device 11 stores the authentication header in the extension header and binds to the home agent 12 shown in FIG.
Generate an ing update packet and send it to home agent 1
Send to 2.

The home agent 12 receives the received bind
It is determined whether the authentication data stored in the authentication header of the ing update packet is correct. If the authentication data is determined to be correct, the current position indicator set in the received binding update packet is stored in the binding cache. register. Home agent 12 transmits an acknowledgment packet to terminal device 11.

The terminal device 11 is connected to the terminal device 11 by 2
When the above home agents 12 are associated with each other, the binding upda
Send a te packet. The home agent 12 executes a process of determining whether the authentication data is correct and a process of registering the current position indicator in the binding cache.

Next, the operation of transmitting a packet between the terminal device 13 and the terminal device 11 in the third embodiment will be described with reference to FIG. The terminal device 13 indicates the host name of the terminal device 11, and sends the node identifier of the terminal device 11 and the terminal device 1 to the domain name server 144 (corresponding to the domain name server 14 in FIG. 16).
Binding agent 121 associated with 1
Query the IPv6 address of The domain name server 144 corresponds to the host name as shown in FIG.
Since the node identifier of the terminal device 11 and the IPv6 address of the binding agent 121 associated with the terminal device 11 are stored, the node identifier of the terminal device 11 and the IPv6 address of the binding agent 121 associated with the terminal device 11 are stored. It reads the node identifier and sends the IPv6 address of the binding agent 121 to the terminal device 13.

The domain name server 144 responds to the host name of the terminal device 11 by using the IPv6 address of one or more binding agents 121 associated with the terminal device 11.
I remember the address. For example, the domain name server 144 stores the IPv6 addresses "iii", "jjjj", and "kkkk" of the three binding agents 121 corresponding to the terminal device having the host name "aaa". The domain name server 144 responds to the terminal device having the host name “bbbb” by using the IP address of one binding agent 121.
v6 address, "mmmm" is stored. The domain name server 144 has two binding agents 1 corresponding to the terminal device having the host name “cccc”.
21 for each IPv6 address "nnnn", and "
oooo "is stored.

When a node identifier of the terminal corresponding to the terminal having the host name “aaa” and an IPv6 address corresponding to the home agent are requested, the domain name server 144 sends the node identifier “αααα” and the IPv6 address ”. iii), “jjjj”, and “kkkk”. When the node identifier of the terminal device corresponding to the terminal device having the host name “bbbb” and the IPv6 address corresponding to the home agent are requested, the domain name server 144 stores the node identifier “ββββ” and the IPv6 address “mmmm”. Send. When the node identifier of the terminal corresponding to the terminal having the host name “cccc” and the IPv6 address corresponding to the home agent are requested, the domain name server 144 determines the node identifier “γγγγ” and the IP.
The v6 address “nnnn” and “oooo” are transmitted.

The terminal device 13 is the domain name server 1
One IPv6 address is selected from the IPv6 addresses corresponding to the one or more binding agents 121 received from 44 and the node identifier of the terminal device 11 is indicated to the binding agent 121 based on the selected IPv6 address. Inquire about 11 current position indicators.

The binding agent 121 that has received the inquiry stores the current position indicator of the terminal device 11 in correspondence with the node identifier of the terminal device 11 as shown in FIG. The current position indicator of the device 11 is transmitted. The terminal device 13 registers the current position indicator of the terminal device 11 received from the binding agent 121 in the binding cache. The terminal device 13 generates an IPv6 address by combining the current position indicator of the terminal device 11 and the node identifier, and transmits a packet in which the generated IPv6 address is set as a destination shown in FIG. 33 to the terminal device 11. .

The packet transmitted from the terminal device 13 to the terminal device 11 passes through the optimum route because the current position indicator and the node identifier of the terminal device 11 are set in the IPv6 address of the transmission destination. Reach 11.

The domain name server 144 sends the address of the binding agent 121 to the terminal device 13, so that the binding agent 121
It can be connected to any sub-network. Further, since the number of binding agents 121 corresponding to the terminal device 11 is one or more, the terminal device 13 can use another binding agent 121 even if one of the binding agents 121 fails. 11 can be performed.

The terminal device 11 shown in FIG.
The packet transmitted to the terminal device 3 has the current position indicator and the node identifier of the terminal device 11 set as the transmission source.
Since the IPv6 address has been set as the transmission destination, the packet arrives at the terminal device 13 through an optimal route.

Next, an operation when the terminal device 11 moves will be described with reference to FIG. When the terminal device 11 moves, the terminal device 11 acquires a position indicator from the destination wireless sub-network 17 or sub-network 19. The terminal device 11 includes an old position indicator (corresponding to the immediately preceding current position indicator) and a new position indicator (the position indicator acquired from the destination sub-network 19 (current position indicator It stores the current time and the valid time, and transmits a binding update packet in which the S bit is set to the terminal device 13.

The terminal device 13 binds the old position indicator and the new position indicator (current position indicator) stored in the binding update packet received from the terminal device 11.
Register with ingcache. The terminal device 13 transmits an acknowledgment response packet to the terminal device 11.

The terminal device 11 includes an old position indicator, a new position indicator (a position indicator obtained from the destination sub-network 19 (corresponding to the current position indicator at the present time)) shown in FIG. The time and the valid time are stored, and a binding update packet in which the S bit is set is transmitted to the binding agent 121.

The binding agent 121 transmits the old position indicator and the new position indicator stored in the binding update packet received from the terminal device 11 to bi.
Register in nding cache. The binding agent 121 transmits an acknowledgment packet to the terminal device 11.

When transmitting a packet to the terminal device 11, as shown in FIG. 38, the terminal device 13 transmits a packet in which a new position indicator and a node identifier of the terminal device 11 are set as the transmission destination address. The packet in which the old position indicator and the node identifier of the terminal device 11 are set as the transmission destination address shown in FIG. 39 is transmitted.

For example, when the terminal device 11 is connected to the wireless sub-network 17-1 and the wireless sub-network 17-2 in FIG.
In the case where the terminal device 11 is located at the boundary, the radio wave intensity changes, so that the terminal device 11 may appear to be repeatedly moving between the radio sub-network 17-1 and the radio sub-network 17-2 (that is, the terminal The device 11 alternately repeats communication with the base station 16-1 and communication with the base station 16-2).

The terminal device 13 transmits a packet in which the new position indicator and the node identifier of the terminal device 11 are set, and transmits a packet in which the old position indicator and the node identifier of the terminal device 11 are set. Even if the device 11 is located at the boundary between the wireless sub-network 17-1 and the wireless sub-network 17-2, the terminal device 1
1 can surely transmit the packet.

Further, as shown in FIG. 40, when a firewall is provided between the sub-network 19-1 and the sub-network 19-2, the terminal device 11
When connected to the sub-network 19-1, the terminal device 13-1 is operated based on the services of the domain name server 144-1 and the binding agent 121-1.
When connected to the subnetwork 19-2, the terminal device 13-2 can communicate with the terminal device 13-2 based on the services of the domain name server 144-2 and the binding agent 121-2.

Further, the terminal device 11 is provided with the bind shown in FIG.
When the ing update packet is transmitted to the terminal device 13 or the binding update packet shown in FIG.
The router 18 that transfers the ing update packet can update the locator corresponding to the terminal device 11 registered in the router binding cache shown in FIG.

Next, updating of the router binding cache will be described. As shown in FIG. 41, the router binding cac
he has a new position indicator (corresponding to the current position indicator at the present time), an old position indicator (corresponding to the previous current position indicator), time, and valid time corresponding to the node identifier. Is stored.

Next, the router binding cache of the router 18
The operation of updating the position indicator corresponding to the terminal device 11 registered in the server will be described with reference to FIG.

The terminal device 11 is connected to the wireless sub-network 17
When activated within -1, the terminal device 11 acquires a position indicator corresponding to the wireless sub-network 17-1,
A binding update packet storing a position indicator corresponding to the wireless sub-network 17-1 is transmitted to the binding agent 121. At this time, as shown in FIG.
The "old locator" field in the binding update packet will be blank.

The data of the current time is stored in the “current time” field of the binding update packet.
In the “valid time” field of the g update packet, valid time data is stored.

When transferring the binding update packet, the router 18-5 stores the terminal device 11 in the router binding cache because the “old location indicator” field is blank.
Do not generate an entry corresponding to.

Similarly, the router 18-3 and the router 18-
2. When transferring the binding update packet, the router 18-1 and the router 18-1 do not generate an entry corresponding to the terminal device 11 in the router binding cache because the field of the "old location indicator" is blank.

Next, when the terminal device 11 moves from the wireless sub-network 17-1 to the wireless sub-network 17-2, the terminal device 11 transmits
2 and obtains the position indicator corresponding to the wireless sub-network 17-1 (old position indicator)
And a binding update storing a position indicator (new position indicator) corresponding to the wireless subnetwork 17-2
The packet is transmitted to the binding agent 121. That is, the location indicator corresponding to the wireless sub-network 17-1 is stored in the field of the "old location indicator" of the binding update packet shown in FIG.
The "new position indicator" field of the ing update packet stores a position indicator corresponding to the wireless sub-network 17-2.

The router 18-5 stores the position indicator corresponding to the wireless sub-network 17-1 in the “old position indicator” field, and stores the position indicator in the “new position indicator” field in the wireless sub-network 17-2. When transferring a binding update packet in which the corresponding locator is stored, the "old locator" field is not blank, and the transfer destination of the packet corresponding to the old locator and the packet corresponding to the new locator Therefore, an entry corresponding to the terminal device 11 is generated in the router binding cache stored in the router 18-5. Router 1
8-5 is the current time data of the binding update packet.
Stored at the time of the router binding cache entry, bind
ing update packet validity time router bindi
Store in the valid time of ng cache entry.

The router 18-3 stores the position indicator corresponding to the radio sub-network 17-1 in the “old position indicator” field, and stores the position indicator in the “new position indicator” field in the radio sub-network 17-2. When transferring a binding update packet in which the corresponding locator is stored, the "old locator" field is not blank, and the transfer destination of the packet corresponding to the old locator and the packet corresponding to the new locator Since the transfer destination is different, an entry corresponding to the terminal device 11 is generated in the router binding cache stored in the router 18-3. Router 1
8-3 is the current time data of the binding update packet.
Stored at the time of the router binding cache entry, bind
ing update packet validity time router bindi
Store in the valid time of ng cache entry.

The routers 18-2 and 18-1 add the radio sub-network 17 to the "old location indicator" field.
When a binding update packet in which a position indicator corresponding to -1 is stored and a position indicator corresponding to the wireless sub-network 17-2 is stored in the field of "new position indicator" is transferred, the old position indicator Since the destination of the corresponding packet is the same as the destination of the packet corresponding to the new locator, the stored router bin
No entry corresponding to the terminal device 11 is generated in the ding cache.

The terminal device 11 is connected to the wireless sub-network 17
When the terminal device 11 has moved from -2 to the wireless sub-network 17-3, the terminal device 11 acquires the position indicator corresponding to the wireless sub-network 17-3, and A binding update packet storing the position indicator (new position indicator) corresponding to the wireless subnetwork 17-3 and the position indicator (new position indicator) is transmitted to the binding agent 121.
That is, the "old location indicator" field of the binding update packet shown in FIG. 37 stores the location indicator corresponding to the wireless sub-network 17-2.
The "new position indicator" field of the update packet stores a position indicator corresponding to the wireless sub-network 17-3.

The router 18-7 stores the position indicator corresponding to the wireless sub-network 17-2 in the “old position indicator” field, and stores it in the wireless sub-network 17-3 in the “new position indicator” field. When transferring a binding update packet in which the corresponding locator is stored, the "old locator" field is not blank, and the transfer destination of the packet corresponding to the old locator and the packet corresponding to the new locator Therefore, an entry corresponding to the terminal device 11 is generated in the router binding cache stored in the router 18-7. Router 1
8-7 is the current time data of the binding update packet.
Stored at the time of the router binding cache entry, bind
ing update packet validity time router bindi
Store in the valid time of ng cache entry.

The router 18-4 stores the position indicator corresponding to the wireless sub-network 17-2 in the “old position indicator” field, and stores the position indicator in the “new position indicator” field in the wireless sub-network 17-3. When transferring a binding update packet in which the corresponding locator is stored, the "old locator" field is not blank, and the transfer destination of the packet corresponding to the old locator and the packet corresponding to the new locator Since the transfer destination is different, an entry corresponding to the terminal device 11 is generated in the router binding cache stored in the router 18-4. Router 1
8-4 is the current time data of the binding update packet.
Stored at the time of the router binding cache entry, bind
ing update packet validity time router bindi
Store in the valid time of ng cache entry.

The router 18-2 stores the position indicator corresponding to the wireless sub-network 17-2 in the “old position indicator” field, and stores the position indicator corresponding to the wireless sub-network 17-3 in the “new position indicator” field. When transferring a binding update packet in which the corresponding locator is stored, the "old locator" field is not blank, and the transfer destination of the packet corresponding to the old locator and the packet corresponding to the new locator Destination is different, so bi
The entry corresponding to the terminal device 11 is updated in the router binding cache stored in the router 18-2 based on the old position indicator and the new position indicator stored in the nding update packet. Router 18-2 bindin
g Updates the time and valid time of the router binding cache entry based on the current time data and valid time data of the update packet.

The router 18-1 stores the position indicator corresponding to the wireless sub-network 17-2 in the “old position indicator” field, and stores the position indicator in the “new position indicator” field in the wireless sub-network 17-3. When transferring the binding update packet in which the corresponding locator is stored, the destination of the packet corresponding to the old locator is the same as the destination of the packet corresponding to the new locator. Remembered router binding c
An entry corresponding to the terminal device 11 is not generated in ache.

The terminal device 11 is connected to the wireless sub-network 17
When the terminal device 11 moves from the wireless sub-network 17-4 to the wireless sub-network 17-4, the terminal device 11 obtains the position indicator corresponding to the wireless sub-network 17-4, and A binding update packet storing the position indicator (new position indicator) corresponding to the wireless sub-network 17-4 and the position indicator (new position indicator) is transmitted to the binding agent 121.
That is, the location indicator corresponding to the wireless sub-network 17-3 is stored in the “old location indicator” field of the binding update packet shown in FIG.
The "new position indicator" field of the update packet stores a position indicator corresponding to the wireless sub-network 17-4.

The router 18-8 stores the position indicator corresponding to the wireless sub-network 17-3 in the “old position indicator” field, and stores the position indicator in the “new position indicator” field in the wireless sub-network 17-4. When transferring a binding update packet in which the corresponding locator is stored, the "old locator" field is not blank, and the transfer destination of the packet corresponding to the old locator and the packet corresponding to the new locator Therefore, an entry corresponding to the terminal device 11 is generated in the router binding cache stored in the router 18-8. Router 1
8-8 is the current time data of the binding update packet.
Stored at the time of the router binding cache entry, bind
ing update packet validity time router bindi
Store in the valid time of ng cache entry.

The router 18-4 stores the position indicator corresponding to the wireless sub-network 17-3 in the “old position indicator” field, and stores the position indicator corresponding to the wireless sub-network 17-4 in the “new position indicator” field. When transferring a binding update packet in which the corresponding locator is stored, the "old locator" field is not blank, and the transfer destination of the packet corresponding to the old locator and the packet corresponding to the new locator Destination is different, so bi
The entry corresponding to the terminal device 11 is updated in the router binding cache stored in the router 18-4 based on the old position indicator and the new position indicator stored in the nding update packet. Router 18-4 bindin
g Updates the time and valid time of the router binding cache entry based on the current time data and valid time data of the update packet.

The router 18-2 stores the position indicator corresponding to the wireless sub-network 17-3 in the “old position indicator” field, and stores the position indicator in the “new position indicator” field in the wireless sub-network 17-4. When transferring the binding update packet in which the corresponding locator is stored, the transfer destination of the packet corresponding to the old locator is the same as the transfer destination of the packet corresponding to the new locator, so that the transfer destination is stored in each. The entry corresponding to the terminal device 11 is not updated in the existing router binding cache.

The router 18-1 stores the position indicator corresponding to the wireless sub-network 17-3 in the “old position indicator” field, and stores the position indicator in the “new position indicator” field in the wireless sub-network 17-4. When transferring the binding update packet in which the corresponding locator is stored, the transfer destination of the packet corresponding to the old locator is the same as the transfer destination of the packet corresponding to the new locator, so that the transfer destination is stored in each. The entry corresponding to the terminal device 11 is not generated in the existing router binding cache.

The router 18 has passed the valid time based on the current time data and valid time data stored in the router binding cache entry and the current time obtained from the RTC (Real Time Clock) of the router 18 and the like. router
Delete the binding cache entry.

When the terminal device 13 transmits a packet addressed to the terminal device 11 and the router 18 transfers the packet, the router 18 stores the locator of the destination address of the packet in the router binding cache. It is determined whether the entry is the same as the old position indicator of the entry corresponding to the terminal device 11, and the position indicator of the packet destination address is registered in the router binding cache.
If it is determined that the location indicator is the same as the old location indicator of the entry corresponding to No. 1, the location indicator of the destination address of the packet is replaced with the new location indicator of the entry corresponding to the terminal device 11 registered in the router binding cache. Rewrite to child and transfer.

The terminal device 1 whose position indicator of the destination address of the packet is registered in the router binding cache
If it is determined that the position indicator is not the same as the old position indicator of the entry corresponding to 1, the router 18 forwards the packet without rewriting the position indicator.

Even when the terminal device 13 transmits a packet addressed to the terminal device 11 based on the old position indicator, the packet is not discarded because the old position indicator is rewritten with the new position indicator. The device 11 is reached.
An entry corresponding to the terminal device 11 is generated in the router binding cache of the router 18 in which the transfer destination of the packet corresponding to the old locator is different from the transfer destination of the packet corresponding to the new locator. Since the entry corresponding to the terminal device 11 is generated only in the router binding cache of the router 18 which may rewrite the scalability, there is no problem in scalability.

Next, the process of notifying the current position indicator from the terminal device 11 to the binding agent 121 in the third embodiment will be described with reference to the flowchart in FIG. In step S41, the terminal device 1
The first communication unit 43 acquires the current position indicator of the subnetwork 19. In step S42, the communication unit 43 of the terminal device 11 selects a predetermined binding agent 121. In step S43, the communication unit 43 of the terminal device 11 performs the binding Upda
Generate a te packet. In step S44, the communication unit 43 of the terminal device 11 transmits the generated binding Update packet to the binding agent 121 selected in the processing of step S42.

At step S45, the binding agent 121 receives the binding Update packet. In step S46, the binding agent 121 determines whether the authentication data stored in the authentication header of the received binding Update packet is correct. If it is determined that the authentication data is correct, the process proceeds to step S47, where the binding update is performed. Register the current position indicator stored in the packet in the binding cache. In step S48, the binding agent 12
1 transmits an acknowledgment packet to the terminal device 11. In step S49, the terminal device 11 receives the acknowledgment packet.

At step S50, the terminal device 11
Determines whether the current position indicator has been transmitted to all the binding agents 121 corresponding to the terminal device 11. If it is determined that the current position indicator has not been transmitted to all the binding agents 121, Returning to S42, the process of transmitting the current position indicator to the binding agent 121 is repeated.

If it is determined in step S50 that the current position indicator has been transmitted to all the binding agents 121, the process ends.

When it is determined in step S46 that the authentication data is not correct, the process ends without using the data stored in the received packet.

As described above, one or more binding agents 121 corresponding to the terminal device 11
The current position indicator corresponding to the terminal device 11 stored in che is updated.

Next, a packet communication process between the terminal device 13 and the terminal device 11 in the third embodiment will be described with reference to the flowchart in FIG.
In step S81, the terminal device 13
The host device requests the name server 144 for the node identifier of the terminal device 11 and the address of the binding agent 121 corresponding to the terminal device 11.

At step S82, the name server 1
44 transmits to the terminal device 13 the node identifier of the terminal device 11 and the address of one or more binding agents 121 corresponding to the terminal device 11. Step S
In 83, the terminal device 13 selects a predetermined binding agent 121 address from the received binding agent 121 address.

At step S84, the terminal device 13
Requests the binding agent 121 for the current position indicator corresponding to the terminal device 11 based on the selected address. In step S85, the binding agent 121 makes the terminal device 13
Is transmitted.

At step S86, the terminal device 13
Binds the current position indicator corresponding to the terminal device 11
Register in cache. In step S87, the terminal device 13 configures an address based on the current position indicator and the node identifier corresponding to the terminal device 11. Step S
At 87, the terminal device 13 transmits a packet to the terminal device 11 based on the configured address. This packet reaches the terminal device 11 through an optimal route.

At step S88, the terminal device 11
Transmits a packet to the terminal device 13. Step S8
The packet transmitted at 8 also reaches the terminal device 13 via the optimal route.

As described above, the terminal device 13 can transmit a packet to the terminal device 11 through an optimal route. The terminal device 11 can transmit a packet to the terminal device 13 through an optimal route.

Next, a process when the terminal device 11 moves in the third embodiment will be described with reference to the flowchart in FIG. In step S101, the communication unit 43 of the terminal device 11 acquires a position indicator of the connected sub-network 19. Step S
In 102, the communication unit 43 of the terminal device 11 transmits the new position indicator (current position indicator) and the old position indicator to the terminal device 13 in a binding update packet in which the S bit is set.

At step S103, the terminal device 13
Registers the new position indicator (current position indicator) and the old position indicator stored in the received binding update packet in the binding cache. In step S104, the terminal device 13 transmits an acknowledgment packet to the terminal device 11.

At step S105, the terminal device 11
Transmits a new position indicator (current position indicator) and an old position indicator to the binding agent 121 in a binding update packet in which the S bit is set. In step S106, the binding agent 1
21 registers the new position indicator (current position indicator) and the old position indicator stored in the received binding update packet in the binding cache. Step S10
At 7, the binding agent 121 transmits an acknowledgment packet to the terminal device 11.

At step S108, the terminal device 13
Transmits a packet to the terminal device 11 based on the new position indicator, and transmits a packet based on the old position indicator, and the process ends.

As described above, even if the terminal device 11 moves,
The terminal device 13 can transmit a packet to the terminal device 11. Further, even if the terminal device 11 is located at the boundary between the wireless sub-networks 17, the terminal device 13 can reliably transmit the packet to the terminal device 11.

Next, the router 18 executing the router binding cache management program causes the router 18 to execute the binding upda storing the old position indicator and the new position indicator.
Router binding executed when receiving te packet
The process of updating the cache will be described with reference to the flowchart in FIG. In step S121, the router bindi
The ng cache management program determines whether or not the old locator of the received packet is blank. If it is determined that the old locator is not blank, the process proceeds to step S122, and the ng cache management program corresponds to the new locator. The destination of the packet and the destination of the packet corresponding to the old locator are determined.

In step S123, the router bindi
The ng cache management program determines whether the transfer destination of the packet corresponding to the old locator is different from the transfer destination of the packet corresponding to the new locator, and determines whether the transfer destination of the packet corresponding to the old locator is different. If it is determined that the destination of the packet corresponding to the new locator is different from the transfer destination, the process proceeds to step S124 to determine whether or not the router binding cache has an entry corresponding to the node identifier stored in the packet. judge.

At step S124, the router bindi
If it is determined that the entry corresponding to the node identifier stored in the packet exists in the ng cache, the process proceeds to step S125, and the router binding cache management program determines the node based on the data stored in the binding update packet. Router binding cache corresponding to the identifier
Is updated, and the process ends.

In step S124, the router bindi
When it is determined that the entry corresponding to the node identifier stored in the packet does not exist in the ng cache, the process proceeds to step S126, and the router binding cache management program performs the processing based on the data stored in the binding update packet. Router binding cac corresponding to node identifier
An entry for he is generated, and the process ends.

If it is determined in step S123 that the transfer destination of the packet corresponding to the old locator is the same as the transfer destination of the packet corresponding to the new locator, generation or update of an entry in the router binding cache is performed. The process ends without performing the process of (1).

If it is determined in step S121 that the old position indicator is blank, the router binding cac
Since he cannot be generated or updated,
The process ends.

As described above, the router 18 has the router bin
Update or generate ding cache entries.

Next, a description will be given, with reference to FIG. 46, of a process of rewriting a packet position indicator by the router 18, which is executed by the router 18 executing the packet transfer program when the router 18 receives the packet. In step S151, the packet transfer program performs ro based on the node identifier stored in the received packet.
Search uter binding cache.

In step S152, the packet transfer program determines whether an entry corresponding to the node identifier stored in the packet received in the router binding cache exists, and determines that an entry corresponding to the node identifier exists. If so, the process proceeds to step S153, and the new position indicator and the old position indicator corresponding to the node identifier are read.

In step S154, the packet transfer program determines whether the position indicator of the packet is the same as the old position indicator, and determines whether the position indicator stored in the packet is the same as the old position indicator. If it is determined that there is a packet, the process proceeds to step S155, the position indicator of the packet is rewritten with a new position indicator, and the process ends.

When it is determined in step S154 that the position indicator stored in the packet is not the same as the old position indicator, step S155 is skipped,
The process ends.

If it is determined in step S152 that there is no entry corresponding to the node identifier, the process is terminated because the position indicator cannot be rewritten.

As described above, the router 18 transfers the packet after the above rewriting process. Router 18
Since the old position indicator of the packet to be transferred is rewritten with the new position indicator, the transferred packet reliably reaches the terminal device 11 without being lost.

The series of processes described above can be executed by hardware, but can also be executed by software. When a series of processing is executed by software, a program constituting the software can execute various functions by installing a computer built into dedicated hardware or installing various programs. It is installed from a recording medium into a possible general-purpose personal computer or the like.

This recording medium is, as shown in FIG. 19 or 20, separately from a computer, a magnetic disk 61 or a magnetic disk 111 (floppy disk) on which the program is recorded, which is distributed in order to provide the user with the program. ), The optical disk 62 or the optical disk 112 (CD-ROM (Compact Disc-Read Only Memor
y), DVD (including Digital Versatile Disc), magneto-optical disk 63 or magneto-optical disk 113 (MD (Min
i-Disc), or a ROM 32 in which a program is recorded, which is provided to a user in a state where the program is incorporated in a computer in addition to a package medium including the semiconductor memory 64 or the semiconductor memory 114. Alternatively, it is configured by the ROM 82, the HDD 41, and the like.

In this specification, the step of describing a program stored in a recording medium may be performed in a chronological order according to the described order. This also includes processing executed in parallel or individually.

In the present specification, the system is
It represents the entire device composed of a plurality of devices.

[0164]

According to the information processing apparatus according to the first aspect, the information processing method according to the second aspect, and the recording medium according to the third aspect, the current information of the terminal device connected on the network is obtained. It is determined whether or not the first packet for notifying the position, including the first data for specifying the position, includes second data for specifying the position of the terminal device before the movement, and It is determined whether the transfer destination when transferring the second packet for data transfer addressed to the current position is the same as the transfer destination when transferring the second packet to the position before movement, and the first packet is determined. It is determined that the second data is included in the packet, and the transfer destination of the second packet when the packet is addressed to the current position of the terminal device and the second packet when the packet is addressed to the position before the movement of the terminal device If it is determined that the destination of the packet No. 2 is not the same, The first data and the second data are stored in association with each other, and when a second packet in which the second data is set as the destination address is received, the second packet is stored based on the stored correspondence. Since the second data set as the destination address in the second packet is rewritten to the first data, the discard of the packet as the fourth data can be further reduced.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a procedure for registering a care-of address.

FIG. 2 is a diagram illustrating a format of an IPv6 header.

FIG. 3 is a diagram showing a format of an IPv6 address.

FIG. 4 is a diagram illustrating a conventional binding update packet.

FIG. 5 is a diagram illustrating an authentication header.

FIG. 6 is a diagram illustrating an outline of an authentication process.

FIG. 7 is a diagram illustrating a conventional procedure for transmitting a packet to a terminal device 1 in which a terminal device 3 moves.

FIG. 8 is a diagram for explaining the association between a host name and a home address stored in the domain name server 4.

FIG. 9 is a diagram illustrating a packet transmitted by the terminal device 3.

FIG. 10 is a diagram illustrating a packet transmitted by home agent 2.

FIG. 11 is a diagram illustrating a packet transmitted from the terminal device 1 to the terminal device 3.

12 is a diagram illustrating a routing header added to a packet transmitted from the terminal device 3 to the terminal device 1. FIG.

FIG. 13 is a diagram illustrating an operation when the terminal device 1 moves.

FIG. 14 is a diagram illustrating a binding update packet.

FIG. 15 is a diagram illustrating a binding update packet.

FIG. 16 is a diagram showing an embodiment of the network system of the present invention.

FIG. 17 is a diagram illustrating a mobile-oriented IPv6 address.

FIG. 18 is a diagram showing a configuration of a protocol layer in VIPv6.

FIG. 19 is a diagram illustrating a configuration of a terminal device 11;

FIG. 20 is a diagram illustrating a configuration of a router 18.

FIG. 21 is a diagram illustrating a procedure in which the terminal device 13 transmits a packet to the moving terminal device 11 according to the first embodiment.

FIG. 22 is a diagram illustrating a corresponding host name, home location indicator, and node identifier stored in the domain name server 14.

FIG. 23 is a diagram illustrating a packet transmitted by the terminal device 13;

FIG. 24 is a diagram illustrating a packet transferred by the home agent 12.

FIG. 25 is a diagram illustrating an outline of an authentication process.

FIG. 26 shows a process in which the terminal device 13 transmits a packet to the moving terminal device 11;

FIG. 27 is a diagram illustrating a process of transmitting a packet to the terminal device 11 in which the terminal device 13 according to the first embodiment moves.

FIG. 28 is a diagram illustrating an operation in which the terminal device 11 notifies the home agent 12 of the current position indicator according to the second embodiment.

FIG. 29 shows binding update in the second embodiment.
FIG. 3 is a diagram illustrating a packet.

FIG. 30 is a diagram illustrating an operation of transmitting a packet between the terminal device 13 and the terminal device 11 according to the third embodiment.

FIG. 31 is a diagram illustrating a corresponding host name, node identifier, and home agent address stored in the domain name server 144.

FIG. 32 is a diagram illustrating a corresponding node identifier and a current position indicator stored in the binding agent 121.

FIG. 33 is a diagram illustrating a packet transmitted from the terminal device 13 to the terminal device 11.

FIG. 34 is a diagram illustrating a packet transmitted from the terminal device 11 to the terminal device 13.

FIG. 35 is a diagram illustrating an operation when the terminal device 11 moves.

FIG. 36: bind transmitted by the terminal device 11 to the terminal device 13
It is a figure explaining an ing update packet.

FIG. 37 is a diagram illustrating a binding update packet transmitted from the terminal device 11 to the binding agent 121.

FIG. 38 is a diagram illustrating a packet transmitted from the terminal device 13 to the terminal device 11.

39 is a diagram illustrating a packet transmitted from the terminal device 13 to the terminal device 11. FIG.

FIG. 40 is a diagram illustrating communication of the terminal device 11 in a network provided with a firewall.

FIG. 41 is a diagram illustrating a router binding cache.

FIG. 42 is a flowchart illustrating a process of notifying a current position indicator from the terminal device 11 to the binding agent 121 according to the third embodiment.

FIG. 43 is a flowchart illustrating a packet communication process between the terminal device 13 and the terminal device 11 according to the third embodiment.

FIG. 44 is a flowchart illustrating processing when the terminal device 11 moves according to the third embodiment.

FIG. 45 is a flowchart illustrating a process of updating a router binding cache.

FIG. 46 is a flowchart illustrating a process of rewriting a packet position indicator.

[Explanation of symbols]

11 terminal device, 12, 12-1, 12-2 home agent, 13 terminal device, 14 domain name server, 15 Internet, 16-1 to 1
6-4 base station, 17-1 to 17-4 wireless subnetwork, 18-1 to 18-8 router, 19-
1 to 19-7 subnetworks, 31 CPUs,
32 ROM, 33 RAM, 41 HDD,
43 communication unit, 61 magnetic disk, 62 optical disk, 63 magneto-optical disk, 64 semiconductor memory,
81 CPU, 82 ROM, 83 RAM,
86 communication unit, 87 communication unit, 111 magnetic disk, 112 optical disk, 113 magneto-optical disk, 114 semiconductor memory, 121, 121-1,
121-2 Binding Agent, 144
Domain name server

Claims (3)

[Claims] 1. A receiving means for receiving a first packet for notifying a position, including first data for specifying a current position of a terminal device connected on a network, and a receiving means for receiving the first packet. First determining means for determining whether or not the first packet includes second data for specifying the position of the terminal device before the movement, and a second determining unit for transferring data addressed to the terminal device. Packet 2
A second determination unit that determines whether a transfer destination when transferring to the current position and a transfer destination when transferring to the position before the movement are the same, and the first determination unit It is determined that the second data is included in the first packet, and the second determination unit determines the transfer destination of the second packet when addressed to the current position of the terminal device. If it is determined that the transfer destination of the second packet is not the same when the terminal device is addressed to the position before the movement, the first data and the second data are stored in association with each other. When the second packet in which the second data is set as the transmission destination address is received, the storage unit transmits the second packet to the second packet based on the correspondence stored in the storage unit. The address set as the destination address The information processing apparatus which comprises a rewriting means for rewriting the data in the first data. 2. A receiving step of receiving a first packet for notifying a position including first data specifying a current position of a connected terminal device on a network, and a process of the receiving step A first determining step of determining whether or not the first packet received at step 2 includes second data for specifying the position of the terminal device before the movement, and a data transfer for the terminal device. Of the second packet of
A second determination step of determining whether a transfer destination when transferring to the current position is the same as a transfer destination when transferring to the position before movement; and the processing of the first determination step , The second packet when it is determined that the first packet includes the second data, and the second packet is addressed to the current position of the terminal device by the processing of the second determination step. If it is determined that the transfer destination of the second packet is not the same as the transfer destination of the second packet when the transfer destination of the second packet is addressed to the position before the movement of the terminal device, the first data and the second data correspond to each other. A storing step of storing and storing, when the second packet in which the second data is set as a transmission destination address is received, based on the correspondence stored in the processing of the storing step, Second
A rewriting step of rewriting the second data set as the destination address in the packet of the second data to the first data. 3. A position of the terminal device before movement is specified in a first packet for notifying a position including first data for specifying a current position of a connected terminal device on a network. A first determination step of determining whether or not second data to be transmitted is included; and a second packet for data transfer addressed to the terminal device,
A second determination step of determining whether a transfer destination when transferring to the current position is the same as a transfer destination when transferring to the position before movement; and the processing of the first determination step , The second packet when it is determined that the first packet includes the second data, and the second packet is addressed to the current position of the terminal device by the processing of the second determination step. If it is determined that the transfer destination of the second packet is not the same as the transfer destination of the second packet when the transfer destination of the second packet is addressed to the position before the movement of the terminal device, the first data and the second data correspond to each other. A storing step of storing and storing, when the second packet in which the second data is set as a transmission destination address is received, based on the correspondence stored in the processing of the storing step, Second
A rewriting step of rewriting the second data set as the destination address in the packet to the first data, wherein the computer-readable program is recorded.