JP2000341330A - Communication protocol proxy processing method, communication protocol proxy processing unit and communication protocol proxy picture service unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To transfer a packet addressed to a node in a sub network to the node without individually noticing a proxy processing node of a new address of each node on a moved sub network to. SOLUTION: The method has a step where a LAN 80 informs a mobile communication network 70 about a set of a main prefix assigned to the LAN 80 before the movement of the LAN 80, its prefix length, a present prefix assigned to the LAN 80 after the movement and its prefix length, a step where the mobile communication network 70 acquires an address of a radio router 90 in the LAN 80, gives a tunneling header using the address for a destination address to a packet to a node in the LAN 80 and the packet is transferred to the LAN 80, and a step where the radio router 90 eliminates the tunneling header, changes the prefix included in the destination address into the present prefix and the header is transferred to a reception node 300.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to proxy processing of a communication protocol performed on a mobile node such as a portable node or a node on a mobile sub-network, and particularly to a network to which a plurality of nodes are connected. A communication protocol proxy processing method for transferring a packet between any of the above nodes and a movable node via another node,
The present invention relates to a communication protocol proxy processing device and a communication protocol proxy processing service device for realizing the method.

[0002]

2. Description of the Related Art In a computer network including the Internet, an industry standard IP (Internet) is used.
Protocol), in which case each node in the network needs to have an IP address, which is a unique address on IP. Since packets transmitted and received between the nodes are routed based on the IP addresses, basically, the IP addresses and the positions of the nodes need to be fixedly associated with each other on a one-to-one basis.

[0003] In recent years, portable terminals that can be easily moved have been rapidly penetrating, and the use of such terminals as computer network nodes (hereinafter, portable nodes) has been increasing. However, in the conventional IP, when the portable node moves to another position on the network, a packet addressed to the portable node is not routed to the portable node. Therefore, IETF
(Internet EngineeringTask Force) and other committees for standardizing the Internet.
In P (hereinafter, portable IP), a communication protocol proxy process is defined so that a packet addressed to a portable node can be correctly routed even if the portable node moves.

In this communication protocol proxy process, when a portable node moves into another subnetwork and detects that an IP address has been reassigned due to this movement, the portable node replaces the newly assigned IP address with the previous one. To the proxy processing node in the sub-network belonging to. Thereafter, the packet addressed to the portable node is encapsulated by the tunneling header and transferred from the proxy processing node to the portable node.

Hereinafter, the operation of a computer network employing the above-described communication protocol proxy processing method will be described with reference to FIG. 10, reference numeral 10 denotes a wide area communication network such as the Internet, and 21 and 22 denote LANs, respectively.
(Local Area Network), which are interconnected by the wide area communication network 10. Reference numerals 31 and 32 denote routers connected to the wide area communication network 10, respectively.
21, the router 32 is included in the LAN 22.

Reference numeral 40 denotes a receiving node for receiving a packet transmitted from any node in the computer network to itself, and 51 and 52 denote portable IP proxy processors, respectively. The portable IP proxy processing device 52 is arranged in the router 32. Reference numeral 60 denotes a certain transmitting node in the computer network, which transmits a packet addressed to the receiving node 40 here.

In the above-described configuration, when the receiving node 40 moves from the LAN 21 to the LAN 22, the receiving node 40 transmits the newly assigned IP address to the portable IP of the LAN 21 via the portable IP proxy processing device 52 of the LAN 22. Notify the proxy processing device 51. Under such circumstances, if the transmitting node 60 transmits a packet addressed to the receiving node 40 without knowing that the receiving node 40 has moved, the packet is transmitted to the portable IP proxy processing device 51 of the LAN 21.
, And transferred to the receiving node 40 via the portable IP proxy processing device 52.

[0008]

However, when not only a single receiving node but also a subnetwork (for example, a LAN) including a proxy processing node (a router having a portable IP proxy processing device) moves, the receiving is performed. Even if a packet addressed to the receiving node is transmitted from a transmitting node that does not know that the node has moved, this packet is not routed to the surrogate processing node. That is, the packet is not received by the proxy processing node, and therefore, the packet does not reach the desired receiving node.

On the other hand, when the proxy processing node is located outside the moved sub-network, as described above,
A packet addressed to a receiving node transmitted from a transmitting node that does not know that the receiving node has moved is received by a desired receiving node, but each node on the moved sub-network substitutes for a newly assigned IP address. Nodes will be notified individually. That is, the above notification is performed for all nodes on the moved sub-network, which is inefficient.

The present invention has been made in view of the above circumstances, and each node on a moved sub-network transmits a packet addressed to a moved receiving node without individually notifying a new address to a proxy processing node. An object of the present invention is to provide a communication protocol proxy processing method capable of reliably transferring data to the receiving node, and a communication protocol proxy processing device and a communication protocol proxy processing service device for realizing the method.

[0011]

To solve the above-mentioned problems, a communication protocol proxy processing method according to claim 1 has a proxy processing node for routing a packet to its destination address and at least one receiving node. Combination of a global identifier for identifying the sub-network and a local identifier for identifying a node in the sub-network, including a movable sub-network and a wide area communication network to which the proxy processing node is connected A communication protocol proxy for transferring a packet addressed to the receiving node to the receiving node after the movement of the sub-network in a network in which a communication protocol that specifies a node address and that enables tunneling processing is implemented. Processing method, before moving A notification step in which the subnetwork notifies the wide area communication network of a set of the old global identifier assigned to the subnetwork and the current global identifier and the local identifier of the proxy processing node assigned to the subnetwork after the movement. A tunneling header adding step in which the wide area communication network adds a tunneling header including the address of the proxy processing node as a destination address to a packet addressed to the receiving node to generate a tunneling packet; and sends the tunneling packet to the proxy processing node. A tunneling packet transfer step of transferring; a tunneling header removing step of removing the tunneling header from the tunneling packet; and a tunneling header removing step by the tunneling header removing step. A destination address conversion step of changing a global identifier included in the destination address of the packet addressed to the receiving node obtained as described above to the current global identifier, and a packet whose destination address global identifier has been changed by the destination address conversion step. Transferring the packet to the receiving node.

In the above method, the communication protocol may be an Internet protocol, the global identifier may be a combination of a prefix and a prefix length (claim 2), the wide area communication network may be a mobile communication network, and the proxy processing may be performed. The node may be a wireless router (Claim 3), or the wide area communication network sends a packet addressed to the receiving node to a source node of the packet addressed to the receiving node, before transmitting the packet addressed to the receiving node to the proxy processing node. A global identifier change instructing step for instructing to add a tunneling header including an address as a destination address may be provided (claim 4).

According to another aspect of the present invention, a communication protocol proxy processing device is included in a movable sub-network having at least one receiving node and connected to a wide area communication network. A communication protocol that specifies a node address by a combination of a global identifier for identifying the sub-network and a local identifier for identifying a node in the sub-network, and enables a tunneling process. A communication protocol proxy processing device for transferring a packet addressed to the receiving node to the receiving node after the movement of the subnetwork in a network having a communication protocol, the current global identifier assigned to the subnetwork after the movement And the subnet before moving Sub-storage means for storing the old global identifier assigned to the network, and registering the current global identifier, the old global identifier, and the local identifier of the own device in association with the local area network side, Registration requesting means for requesting to transfer a tunneling packet including a packet addressed to the node to the own device, packet receiving means for receiving the tunneling packet addressed to the own device, extracting a packet included in the tunneling packet, Header converting means for changing a global identifier included in the destination address to the current global identifier; and packet transferring means for transferring a packet whose global identifier has been changed by the header converting means to the receiving node. And

According to this configuration, when the current global identifier and the old global identifier are registered in association with each other on the wide area communication network side, when a tunneling packet addressed to the own device is transmitted, it is received. After the removal of the tunneling header, the global identifier included in the destination address of the packet is changed to the current global identifier, and the changed packet is transferred to the subnetwork.

Further, in the communication protocol proxy processing device, the communication protocol may be an Internet protocol, the global identifier may be a combination of a prefix and a prefix length (claim 6), or the wide area communication network may be a mobile communication network. The registration requesting means and the packet receiving means may communicate with the wide area communication network via a wireless communication path (claim 7).

According to another aspect of the present invention, there is provided a communication protocol proxy processing service apparatus which includes a proxy processing node for routing a packet to its destination address and at least one receiving node. A device included in a wide area communication network connected to a sub-network, and specifies a node address by a combination of a global identifier for identifying the sub-network and a local identifier for identifying a node in the sub-network. A communication protocol proxy processing service device for transferring a packet addressed to the receiving node to the receiving node after moving the sub-network in a network that implements a communication protocol that enables tunneling processing. , After the sub A global storage means for storing the current global identifier assigned to the network, the old global identifier assigned to the sub-network before the movement and the local identifier of the proxy processing node in association with each other, and a packet addressed to the receiving node. A route request unit for requesting the wide area network to perform routing to its own device; a packet reception processing proxy unit for receiving a packet addressed to the receiving node; and a tunneling header including an address of the proxy processing node as a destination address. It is characterized by comprising: a tunneling header adding unit that adds a packet received by the packet reception processing proxy unit to generate a tunneling packet; and a packet transfer unit that transfers the tunneling packet to the subnetwork.

According to this configuration, a packet (a packet addressed to the receiving node) including the old global identifier in the destination address arrives at the communication protocol proxy processing service apparatus, and the apparatus receives the packet and receives the packet. A tunneling header including the address of the proxy processing node as a destination address is added and transferred to the subnetwork. The transferred packet is received by the proxy processing node. Therefore, after the proxy processing node removes the tunneling header and transfers the packet to the node corresponding to the local identifier in the destination address, the packet arriving at the communication protocol proxy processing service device reaches the desired node.

Further, in the communication protocol proxy processing service device, the communication protocol may be an Internet protocol, the global identifier may be a combination of a prefix and a prefix length (claim 9), or the wide area network may be a mobile communication. A network, the proxy processing node may be a wireless router, and the packet transfer means may communicate with the sub-network via a wireless transmission path (claim 10). Destination movement correspondence instructing means for transmitting a message instructing a source node of the received packet to attach a tunneling header including the address of the proxy processing node as a destination address to the packet addressed to the receiving node before transmitting the packet. May be provided (claim 11).

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Prior to a specific description of an embodiment of the present invention, first, a basic policy adopted by the present invention and a process for realizing processing based on the policy in the present embodiment will be described. The realization policy will be described. Note that, in the present embodiment, the communication protocol targeted for the proxy service is 1
It is a portable IP (for example, IPv6: IP version 6) that employs a 28-bit address expression.

A: Basic Policy In the present invention, a proxy processing server is arranged on the wide area communication network side outside the moving sub-network, and communication is performed between the proxy processing node on the sub-network side and the proxy processing server. It supports the movement of sub-networks and provides a proxy service for communication protocol processing represented by packet reception.

B: Implementation Policy In the portable IP according to the present embodiment, a prefix is assigned to each subnetwork constituting the whole. Since the length of the prefix (hereinafter, prefix length) is not fixed, the address (host address) of the node in the portable IP is represented by a set of a 128-bit address including the prefix (global identifier) and the prefix length. Be transformed into In the present embodiment, when the subnetwork moves, the proxy processing node determines the prefix (hereinafter, the current prefix) and the prefix length newly assigned to the subnetwork, and the prefix (old prefix) assigned before the movement. Using the (prefix) and the prefix length, the proxy processing server is requested to perform proxy processing of the portable IP.

In this embodiment, the proxy processing server is arranged on the wide area communication network side corresponding to the portable IP in order to prevent the proxy processing server from moving together with the individual sub-networks. Further, in the present embodiment, the portability of the sub-network is ensured by using the wide area communication network as the mobile communication network and the proxy processing node in each sub-network as the wireless router.

Finally, in the present embodiment, when the subnetwork moves, the prefix and the prefix length are transmitted and received between the proxy processing server on the mobile communication network side and the proxy processing node on the subnetwork side. Proxy registration for portable IP processing is performed collectively. In this embodiment, the portable IP is transferred between the proxy processing server and the proxy processing node by transferring a tunneling packet obtained using the prefix and the prefix length.
Is realized.

C: Overall Configuration An embodiment of the present invention will be described below with reference to the drawings. Note that the present invention is not limited to such an embodiment, and various changes can be made within the scope of the technical idea.
FIG. 1 is a diagram showing a configuration of a communication system employing a portable IP proxy processing method according to an embodiment of the present invention. In this figure, 70 is a mobile communication network corresponding to the portable IP, and 80 is a LAN (sub-network) corresponding to the portable IP, and is wirelessly connected to the mobile communication network 70.
Reference numeral 90 denotes a wirelessly connected upper network (mobile communication network 7).
0) and a sub-network (LAN 80) connected by wire
A wireless router (proxy processing node) 100 for routing a packet between the router and 100 is a portable IP proxy processing apparatus arranged in the wireless router 90. Details of the functions of the portable IP proxy processing device 100 will be described later.

A receiving node 300 receives a packet transmitted from an arbitrary node in the system to itself, and is connected to the LAN 80. 200 is a portable IP
It is a portable IP proxy processing service device that performs portable IP proxy processing by communicating with the proxy processing device 100, and is arranged in the mobile communication network 70. Details of the functions of the portable IP proxy processing service device 200 will be described later. Also, 7
Reference numerals 1 and 72 denote base stations of the mobile communication network 70, respectively, which establish a wireless communication path between the wireless router 90 existing in each area and the own station. LAN via this wireless communication path
Communication between the mobile communication network 80 and the mobile communication network 70 is performed.

A transmission node 400 in the system transmits a packet addressed to the reception node 300 here. Although the transmitting node 400 directly connected to the mobile communication network 70 is illustrated in FIG.
As in 00, a node wirelessly connected to the mobile communication network 70 via a wireless router (or a wired router) and a base station may be used as the transmission node 400.

D: Configuration of Main Part Next, the configuration of the main part of the communication system will be described with reference to FIG. FIG. 2 is a block diagram showing a configuration of the portable IP proxy processing device 100, the portable IP proxy processing service device 200, and the receiving node 300 in the communication system.

D-1: Portable IP Proxy Processing Device 100 The portable IP proxy processing device 100 includes a current prefix holding unit 110, a prefix management unit 120, a prefix registration unit (registration request unit) 130, a packet reception processing unit (packet It has a receiving unit 140, a header conversion unit (header conversion unit) 150, a packet transfer unit (packet transfer unit) 160, and a prefix management table 170. The current prefix holding unit 110, the prefix management unit 120, and the prefix management table 170 constitute a sub storage unit.

The current prefix holding unit 110 holds the current prefix and its prefix length. In addition, the current prefix holding unit 110 receives the WAN (Wide Are) when the LAN 80 including the own device 100 moves.
a Network) If the prefix and its prefix length periodically reported from the lower layer interface located above the protocol / physical layer are different from the current prefix being held and the prefix length, the prefix is reported from the lower layer interface. The prefix and the prefix length are held as the current prefix and the prefix length, and the current prefix, the prefix length and their expiration date are supplied to the prefix management unit 120, and the current prefix and the prefix length are included in the own apparatus 100. LAN
80. The current prefix holding unit 110
Even if the prefix and the prefix length periodically notified from the lower layer interface match the current prefix and the prefix length being held, those new expiration dates are sequentially supplied to the prefix management unit 120. I do.

Upon receiving the current prefix, its prefix length, and their expiration date from the current prefix holding unit 110, the prefix management unit 120 stores them in the prefix management table 170. In addition, the prefix management table 170 also includes, in addition to the above, a main prefix mainly assigned to the LAN 80 including the own apparatus 100, its prefix length and their expiration date, a previously assigned prefix and its prefix length and their validity. The expiration date can be stored, but here, to avoid clutter,
It is assumed that only the former is kept. When the prefix management unit 120 stores the current prefix, its prefix length, and their expiration date, the prefix within the expiration date in the prefix management table 170 and its prefix length are only the current prefix and its prefix length. In addition, the prefix management unit 120 stores the prefix management table 1
70 is read and responded to an external inquiry.

The prefix registration unit 130 acquires the main prefix and its prefix length and the current prefix and its prefix length via the prefix management unit 120, and transmits a registration message including these and the address of the own device 100 to the WAN. The data is transmitted to the portable IP proxy processing service device 200 via the lower layer interface located above the protocol / physical layer. This registration message is a message requesting the portable IP proxy processing.

The packet reception processing unit 140 receives a packet addressed to the own device 100 from a lower layer interface located above the WAN protocol / physical layer.

If the packet received by the packet reception processing unit 140 is a packet that includes the address of the own device 100 in the destination address of the tunneling header, the header conversion unit 150 removes the tunneling header and sends it to the prefix management unit 120. It inquires of the current prefix for the main prefix included in the destination address of the packet, rewrites the prefix in the destination address with the current prefix, and sends the rewritten packet to packet transfer section 160.

The packet transfer unit 160 includes the header conversion unit 1
The packet from the node 50 is transferred to the receiving node 300 via a lower layer interface located above the LAN protocol / physical layer.

D-2: Portable IP Proxy Processing Service Device 200 The portable IP proxy processing service device 200 includes a prefix holding unit 210, a prefix management unit 220, a route request unit (route request means) 230, and a packet reception proxy processing unit. (Packet reception processing proxy means) 240, tunneling header providing unit (tunneling header providing means) 250,
It has a packet transfer unit (packet transfer unit) 260, a prefix management table 270, and a destination move correspondence instruction unit (destination move correspondence instruction unit) 280. The prefix holding unit 210, the prefix management unit 220,
And the prefix management table 270 constitute a global storage unit.

The prefix holding unit 210 is a portable IP proxy processing device 100 via a WAN protocol / physical layer.
, And holds the main prefix, its prefix length, the current prefix, its prefix length, and the address of the portable IP proxy processing device 100 in this message.

The prefix management unit 220 stores the information held by the prefix holding unit 210 in the prefix management table 270, reads the contents of the prefix management table 270, and responds to an external inquiry.

The route requesting section 230 includes the main prefix, the length of the prefix, and the address of the apparatus 200 so that a packet containing the main prefix registered in the prefix management table 270 in the destination address is routed to the own apparatus 200. A route request message is sent to the WAN protocol / physical layer.

The packet reception proxy processing unit 240 transmits the packet (the packet containing the main prefix registered in the prefix management table 270 in the destination address) requested by the route requesting unit 230 by transmitting the route request message to the WAN. Receive via protocol / physical layer.

When the packet (packet addressed to the portable IP proxy processing device 100) is received by the packet receiving proxy processing unit 240, the tunneling header adding unit 250 inquires the prefix management unit 220 and inquires of the portable IP proxy processing device. 100 is acquired, and a tunneling header is added to the packet.

Upon receiving the packet to which the tunneling header is added by the tunneling header adding unit 250, the packet transfer unit 260 determines the output interface to the device (portable IP proxy processing device 100) of the destination address, and determines the output interface. And sends the packet to the WAN protocol / physical layer.

When the destination address of the packet received by the packet reception processing proxy unit 240 includes the main prefix registered in the prefix management table 270, the destination move correspondence instructing unit 280 sends the packet to the source node of the packet. Before transmitting a packet to the destination address including the main prefix, a message instructing to add a tunneling header including the address of the portable IP proxy processing device 100 as the destination address is sent to the W
Transmit via AN protocol / physical layer.

D-3: Receiving Node 300 The receiving node 300 includes a prefix receiving unit 310, a self-node address managing unit 320, and a packet receiving processing unit 33.
0 and its own node management table 340. The prefix receiving unit 310 transmits a message from the lower layer interface located above the LAN protocol / physical layer to the own device 300.
Receives the prefix and prefix length assigned to.

The own node address management section 320 configures the own node address using the prefix and the prefix length received by the prefix receiving section 310, registers this in the own node address management table 340, and manages the own node address. The contents of the table 340 are read and responded to an external inquiry.

The packet reception processing unit 330 receives a packet addressed to the own node address registered in the management table 340.

E: Operation Next, the operation of the communication system will be described with reference to FIGS. In FIGS. 3 to 9, the same reference numerals are given to portions common to FIG. 1. In the present embodiment, each of x, y, z, and a represents one digit of a hexadecimal number (that is, four bits), and the prefix and address represented by these characters are four digits according to a general notation. It is written with a separator ":" inserted every time. Further, in the drawings and the following description, when a prefix exists alone without being combined with a local address (local identifier) for identifying a node in a subnetwork, ":: /" is added to the end of the prefix. Notation such as "n" that specifies the number n of bits of the prefix is adopted.

In the present embodiment, since the length of the address is fixed at 128 bits, notation of the number of bits at the end of the address is omitted in the drawings and the following description. In addition, in order to avoid a complicated description, a description regarding an expiration date attached to each prefix is omitted.

FIGS. 3 to 9 show a LAN 80 including a portable IP proxy processing device 100 and a receiving node 300, respectively.
Is normally under the base station 71 to which the base station 72 is connected.
9 is a conceptual diagram showing the operation of the portable IP proxy processing system when the mobile IP proxy processing system moves under the control of the mobile IP proxy processing system. The portable IP proxy processing system executes the processes shown in FIGS. Do.

First, as shown in FIG. 3, when a LAN 80 existing under the base station 1 and assigned the prefix xxxx: xxxx: xxxx: xxxx :: / 64 moves under the base station 2, New prefix for LAN80
yyyy: yyyy: yyyy: yyyy :: / 64 is assigned. Thereby, the portable IP proxy processing device 1 existing in the LAN 80
In the 00 prefix management table 170, yyyy: yyyy: yyyy: yyyy :: / 64 is stored as the current prefix. At this point, the prefix management table 1
70 has the primary prefix xxxx: xxxx: xxxx: xxx
x :: / 64 is stored.

Next, as shown in FIG. 4, the portable IP proxy processing device 100
To 00, the main prefix xxxx: xxxx: xxxx: xxxx :: / 64,
Current prefix yyyy: yyyy: yyyy: yyyy :: / 64 and the address yyyy: yyyy: yyyy: yyyy: zzzz: zzzz: zz of the own device 100
A registration message containing zz: zzzz is sent. As a result, the main prefix, the current prefix, and the address of the portable IP proxy processing device 100 are stored in the prefix management table 270 (notification step).

Next, as shown in FIG. 5, L assigned prefix xxxx: xxxx: xxxx: xxxx :: / 64 from the mobile IP proxy processing service device 200 to the mobile communication network 70.
A route request message requesting transfer of the packet to the AN 80 to the own device 200 is transmitted. As a result, as shown in FIG. 6, when a packet having the destination address xxxx: xxxx: xxxx: xxxx: aaaa: aaaa: aaaa: aaaa is transmitted from the transmission node 400, the packet is transmitted to the portable IP proxy processing service device. 200.

Next, the portable IP proxy processing service device 2
At 00, a tunneling header is added to the packet (tunneling header adding step). The destination address in the tunneling header is the address yyyy: yyyy: yyyy: yyyy: zzzz: zzz of the portable IP proxy processing device 100.
z: zzzz: zzzz, and the packet to which the tunneling header is added is transmitted from the portable IP proxy processing service apparatus 200 to the portable IP proxy processing apparatus 10 as shown in FIG.
0 (tunneling packet transfer step).

Next, the portable IP receiving the packet
In the proxy processing device 100, the tunneling header is removed from the packet (tunneling header removal step), and the destination address of the packet from which the tunneling header has been removed is xxxx: xxxx: xxxx: xxxx: aaaa: aaaa: aaaa: aaa.
Changed from a to yyyy: yyyy: yyyy: yyyy: aaaa: aaaa: aaaa: aaaa (destination address conversion step), prefix yy
Network (LA) equivalent to yy: yyyy: yyyy: yyyy :: / 64
The packet is transferred to the N80) side (packet transfer step). This packet has its own address yyyy: yyyy: yyyy: y
Received by the receiving node 300 of yyy: aaaa: aaaa: aaaa: aaaa.

Also, from the transmitting node 400 to the receiving node 3
The portable IP proxy processing service device 200 that has received the packet to the
Destination address yyyy: yyyy: yyyy: yyyy: zzzz: zzzz: zzzz: z for the tunneling process via the P proxy processing device 100
A process of notifying the transmitting node 400 of the zzz (global identifier change instruction step) is performed. Sending node 400
The destination address notified to is stored in the transmission node 400.

Thereafter, in the transmitting node 400, xxxx: xxxx:
The packet to xxxx: xxxx: aaaa: aaaa: aaaa: aaaa is the address yyyy: yyyy: yyyy: y of the portable IP proxy processor 100
Sent after a tunneling header containing yyy: zzzz: zzzz: zzzz: zzzz is added. That is, the transmitting node 40
The packet from 0 to the receiving node 300 is transferred to the receiving node 300 via the portable IP proxy processing device 100 without passing through the portable IP proxy processing service device 200.

F: Supplement As described above, according to the present embodiment, the portable IP
When the LAN 80 including the proxy processing device 100 is moved,
Packets from outside the AN 80 to the receiving node 300 in the LAN 80 are reliably transferred to the receiving node 300. Also,
By notifying the prefix indicating the LAN 80 to the portable IP proxy processing service device 200,
It is possible to transfer packets addressed to all nodes within the group.

Further, according to the present embodiment, after notifying the destination address included in the tunneling header from portable IP proxy processing service device 200 to transmitting node 400, transmitting node 400 transmits the tunneling header including the destination address. Since the packet is transmitted using the IP service, the load and the traffic can be prevented from being concentrated on the portable IP proxy processing service device 200.

Further, since the present embodiment adopts a mobile communication network as a wide area communication network and supports the next generation IP in the Internet, a high degree of integration between a mobile communication network and a computer network is realized. I have. Therefore, various data communications that have long been realized in the computer network field can be realized in the mobile communication field, and the high portability that was originally realized in the mobile communication field can also be realized in the computer network field. can do.

As described above, the present invention is not limited to the above embodiment. Within the scope of the technical idea of the present invention, for example, the following various changes can be made. (1) In the embodiment described above, LA is included in the registration message.
The current prefix and the prefix length of the N80 and the address of the portable IP proxy processing device 100 are included. However, if the system can handle the local address independently, the address of the portable IP proxy processing device 100 is included in the address. Instead, the local address of the portable IP proxy processing device 100 may be used.

(2) In the present embodiment, as described above, the transmitting node 400 is connected to the portable IP
When receiving the message from the destination movement correspondence instructing unit 280 of 0, the subsequent communication with the node in the LAN 80 is performed using a tunneling packet having the address of the portable IP proxy processing device 100 as the destination address. However, if the portable IP proxy processing device 100 includes a unit that receives a normal packet other than the tunneling packet, the transmission node 400 may transmit a normal packet that is not a tunneling packet.

For example, before transmitting a packet having a destination address including the main prefix registered in the prefix management table 270, the message from the destination movement correspondence instructing unit 280 of the portable IP proxy processing service device 200 is transmitted to the destination address of the packet. Is a message instructing to change the prefix to the current prefix registered in the prefix management table 270. If the sending node 400 operates according to this message,
The packet transmitted from the transmitting node 400 is a portable IP
The packet arrives at the portable IP proxy processing device 100 without passing through the proxy processing service device 200, and is routed as a normal packet here.

(3) The communication protocol targeted for the proxy processing is not limited to the portable IP. In short, a communication protocol having a tunneling function and capable of designating a packet destination with an address composed of an identifier (for example, a prefix) assigned to each subnetwork and an identifier (for example, a local address) assigned within the subnetwork. If there is, it can be a target of proxy processing in the present invention. Of course, the length of each identifier may be variable / fixed.

(4) The wide area communication network is not limited to the mobile communication network. The point is that a portable I / O is allowed in a network that allows the movement of the subnetwork and does not move with the movement of the subnetwork.
Any network can be installed as long as the P-proxy processing service device 200 can be installed and the communication protocol described in (3) is permitted.

[0064]

As described above, according to the present invention, the packet to the moved sub-network is received by the wide area communication network, and transferred to the sub-network without fail. That is, even if a subnetwork having at least one node moves, communication between a node in the subnetwork and a node outside the subnetwork can be maintained. Also, by moving, by registering the global identifier newly assigned to the sub-network on the wide area communication network side, the same effect as registering the addresses of all nodes in the sub-network for proxy processing is obtained. Is obtained, the transfer amount of the packet for address registration can be reduced as compared with the case where each node individually registers the moved address.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration of a communication system employing a portable IP proxy processing method according to an embodiment of the present invention.

FIG. 2 shows a portable IP proxy processing device 100, a portable IP proxy processing service device 200,
3 is a block diagram showing a configuration of a receiving node 300. FIG.

FIG. 3 is a conceptual diagram for explaining an operation of the communication system.

FIG. 4 is a conceptual diagram for explaining an operation of the communication system.

FIG. 5 is a conceptual diagram for explaining an operation of the communication system.

FIG. 6 is a conceptual diagram for explaining an operation of the communication system.

FIG. 7 is a conceptual diagram for explaining an operation of the communication system.

FIG. 8 is a conceptual diagram for explaining an operation of the communication system.

FIG. 9 is a conceptual diagram for explaining an operation of the communication system.

FIG. 10 is a conceptual diagram showing a configuration of a computer network employing a conventional communication protocol proxy processing method.

[Explanation of symbols]

Reference Signs List 70 mobile communication network 71, 72 base station 80 LAN 90 wireless router 100 portable IP proxy processing device 110 current prefix holding unit 120 prefix management unit 130 prefix registration unit 140 packet reception processing unit 150 header conversion unit 160 packet transfer unit 170 prefix management Table 200 Portable Internet Protocol proxy processing service device 210 Prefix holding unit 220 Prefix management unit 230 Route requesting unit 240 Packet reception processing proxy unit 250 Tunneling header adding unit 260 Packet transfer unit 270 Prefix management table 280 Destination movement correspondence instructing unit 300 Receiving node 310 prefix receiving unit 320 own node address management unit 330 packet reception processing unit 340 own node address management Table 400 the sending node

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) 5B089 GA31 HA10 HA11 HB02 HB19 JB14 KA08 KB06 KC51 KH03 5K030 GA03 GA11 HB11 HB28 HC01 HC09 HC14 HD03 HD06 HD09 JL01 JT02 JT09 LB05 LD11 5K033 AA01 AA05 CB01 CB01 DA09 CB01 9 CC05 CC06 CC08

Claims (11)

[Claims] 1. A sub-network comprising: a mobile sub-network having a proxy processing node for routing packets to its destination address and at least one receiving node; and a wide area network to which said proxy processing node is connected. In a network that implements a communication protocol that specifies a node address by a combination of a global identifier for identifying a node and a local identifier for identifying a node in the sub-network, and that enables a tunneling process, A communication protocol surrogate processing method for transferring a packet addressed to the receiving node to the receiving node after the movement of the subnetwork, the method comprising an old global identifier assigned to the subnetwork before the movement and the subnetwork after the movement. To A notification step in which the subnetwork notifies the set of the assigned current global identifier and the local identifier of the proxy processing node to the wide area communication network; and the wide area communication network includes an address of the proxy processing node as a destination address. A tunneling header adding step of adding a tunneling header to a packet addressed to the receiving node to generate a tunneling packet; a tunneling packet transferring step of transferring the tunneling packet to the proxy processing node; and removing the tunneling header from the tunneling packet. A tunneling header removing step; and a global identifier included in a destination address of the packet addressed to the receiving node obtained by removing the tunneling header in the tunneling header removing step. A communication protocol proxy processing method, comprising: a destination address conversion step of changing to a global identifier; and a packet transfer step of transferring a packet whose destination address global identifier has been changed by the destination address conversion step to the receiving node. . 2. The communication protocol proxy processing method according to claim 1, wherein said communication protocol is an Internet protocol, and said global identifier is a combination of a prefix and a prefix length. 3. The communication protocol proxy processing method according to claim 1, wherein the wide area communication network is a mobile communication network, and the proxy processing node is a wireless router. 4. The wide area communication network sends a packet addressed to the receiving node to a source node, the packet addressed to the receiving node including a tunneling header including the address of the proxy processing node as a destination address before transmitting the packet. 2. The communication protocol proxy processing method according to claim 1, further comprising a global identifier change instructing step of instructing to assign. 5. A device included in a mobile sub-network having at least one receiving node and connected to a wide area network, a global identifier for identifying said sub-network, and a node in said sub-network. Receiving a packet addressed to the receiving node after moving the sub-network in a network that implements a communication protocol that specifies a node address in combination with a local identifier for identifying the node and that performs a tunneling process. Sub-storage means for storing a current global identifier assigned to the sub-network after the move and an old global identifier assigned to the sub-network before the move And the current group Registration request for requesting that the global identifier, the old global identifier, and the local identifier of the own device be registered in the wide area communication network side and a tunneling packet including a packet addressed to the receiving node be transferred to the own device. Means, a packet receiving means for receiving a tunneling packet addressed to the own device, a header conversion means for extracting a packet included in the tunneling packet, and changing a global identifier included in the destination address to the current global identifier, A communication protocol proxy processing device, comprising: a packet transfer unit that transfers a packet whose global identifier has been changed by the header conversion unit to the receiving node. 6. The communication protocol proxy processing device according to claim 5, wherein the communication protocol is an Internet protocol, and the global identifier is a combination of a prefix and a prefix length. 7. The wide area communication network according to claim 5, wherein said wide area communication network is a mobile communication network, and said registration request means and said packet receiving means communicate with said wide area communication network via a wireless communication path. Communication protocol proxy processing device. 8. A device included in a wide area network connected to a mobile sub-network having a surrogate processing node for routing packets to its destination address and at least one receiving node for identifying said sub-network. A communication protocol for specifying a node address by a combination of a global identifier for identifying a node in the sub-network and a local identifier for identifying the node in the sub-network. A communication protocol proxy processing service device for transferring a packet addressed to the receiving node to the receiving node after the movement, comprising: a current global identifier assigned to the subnetwork after the movement; and a current global identifier assigned to the subnetwork before the movement. A global storage unit that stores the old global identifier and the local identifier of the proxy processing node in association with each other, and a route request unit that requests the wide area communication network to route a packet addressed to the receiving node to the own device. Generating a tunneling packet by adding a packet reception processing proxy unit receiving a packet addressed to the reception node to a packet received by the packet reception processing proxy unit, the tunneling header including an address of the proxy processing node as a destination address; A communication protocol proxy processing service device, comprising: a tunneling header adding unit that performs tunneling packet transmission; and a packet transfer unit that transfers the tunneling packet to the subnetwork. 9. The communication protocol proxy processing service device according to claim 8, wherein the communication protocol is an Internet protocol, and the global identifier is a combination of a prefix and a prefix length. 10. The wide area communication network is a mobile communication network,
9. The communication protocol proxy processing service device according to claim 8, wherein the proxy processing node is a wireless router, and the packet transfer unit communicates with the sub-network via a wireless transmission path. 11. A packet addressed to the receiving node for a source node of a packet received by the packet reception processing proxy means includes a tunneling header including the address of the proxy processing node as a destination address before the packet is transmitted. 9. An apparatus according to claim 8, further comprising destination movement correspondence instruction means for transmitting a message instructing the assignment.
3. The communication protocol proxy processing service device according to 1.