WO2006112081A1

WO2006112081A1 - Packet transfer system and method, device and program constituting the system, and recording medium

Info

Publication number: WO2006112081A1
Application number: PCT/JP2005/022433
Authority: WO
Inventors: Ippei Akiyoshi
Original assignee: Nec Corporation
Priority date: 2005-03-30
Filing date: 2005-12-07
Publication date: 2006-10-26
Also published as: JP4725751B2; JPWO2006112081A1

Abstract

It is possible to shorten the communication route between a mobile terminal and a server by IP. A node having an encapsulated address list is provided in the communication route between the mobile terminal and the server and the server registered in the list is encapsulated when transferred. This encapsulation is released before the process performed by the server. At this time, a binding list correlating an internal transmission source address with an external transmission address is generated and a response from the server is transmitted to the external transmission source registered in the binding list.

Description

Specification

Packet transfer system and method, apparatus constituting the system, program and recording medium

Technical field

The present invention relates to a mobile communication network, an edge router device, a mobility management method used therefor, and a program therefor, and more particularly to a data communication method and a terminal mobility management method for a mobile terminal using IP (Internet Protocol).

Background art

[0002] Conventionally, as seen in RFC3775 "Mobility Support in IPv6" <http://www.ietf.org/rfc/rfc3775.txt>, the mobile terminal communication method based on the IP protocol is IETF (Internet Engineering Task Force).

[0003] The method described in RFC3775 "Mobility Support in IPv6" <http: 〃 www.ietf.org/rfc/rfc3775.txt> is generally called the Mobile IPv6 method. Figure 1 shows Mobile

The configuration of a mobile communication network using IPv6 is shown. In the following explanation, Mobile IPv6 is abbreviated as MIPv6.

[0004] The mobile communication network shown in FIG. 1 includes home agents 51 and 52, and an edge router 5

3, 54, mobile terminals 55, 56, IP network (router network) 200, home network 301, 3

It consists of 02.

Each of the mobile terminals 55 and 56 has home addresses (HoA: Home Address) “ΗοΑ1” and “HoA2” of the home networks 301 and 302 as IP addresses.

[0006] When the mobile terminals 55 and 56 communicate with each other when the mobile terminals 55 and 56 are in the home networks 301 and 302 of their own terminals, the home addresses “ΗοΑ1” and “HoA2” of each other are used. Data communication using the normal IP protocol is performed using Destination Address and Source Address as the destination address.

Next, a case will be described in which mobile terminals 55 and 56 communicate when mobile terminals 55 and 56 move from their own home networks 301 and 302. The mobile terminal 55 moves under the edge router 53 constituting the IP network 200, and the mobile terminal 56 moves to the IP network 2 It is assumed that the terminal has been moved under the edge router 54 constituting 00.

[0008] Each of the edge routers 53 and 54 advertises a prefix to its subordinate terminals, and the mobile terminals 55 and 56 generate the IP address of the terminal at the destination from the received prefix. The IP address at this destination is called CoA (Care of Address). The CoA under the edge router 53 of the mobile terminal 55 is CoAl, and the CoA under the edge router 54 of the mobile terminal 56 is CoA2.

[0009] The home agents 51 and 52 provided in the home networks 301 and 302 manage the movement destinations of the mobile terminals. When the mobile terminals 55 and 56 generate CoA at the movement destinations, 302, the generated CoA is notified to the home agents 51 and 52, and the home agents 51 and 52 manage the notified CoA.

[0010] When the mobile terminals 55 and 56 move as described above, the mobile terminal 55 transmits data packets to the mobile terminal 56. As shown in FIG. 2 (a), the mobile terminal 55 sends an IP packet whose source address (internal source address) is “ΗοΑ1” and whose destination address (internal destination address) is “HoA2” to the source address. Encapsulate with (CoAl) (external source address) and destination address (external destination address) IP address “HA1” of home agent 51.

[0011] Since the destination address is the IP address (HA1) of the home agent 51, the packet is delivered to the home agent 51. The home agent 51 decapsulates the received packet and sends out an IP packet with the source address “ΗοΑ1” and the destination address “HoA2” as shown in FIG. 2 (b).

[0012] Since the destination address of this packet is “HoA2”, it is delivered to the home network 302. Since there are currently 56 mobile terminals having the address “HoA2” in the home network 302, Home agent 52 receives on behalf of mobile terminal 56.

[0013] The home agent 52 currently manages that the mobile terminal 56 manages the address of "CoA2", manages that the received packet is at the address of "CoA2", and receives the received packet. As shown in Figure 2 (c), the destination address (external destination address) is “CoA 2” and the source address (external source address) is encapsulated with “HA2”, which is the IP address of the home agent 52. To do. This packet has a destination address of "CoA2" Therefore, it is currently delivered to the mobile terminal 56 that is under the edge router 54 and has “CoA2” as the IP address at the destination.

[0014] Thus, in MIPv6, since the destination of the mobile terminal is managed by the home agent provided in the home network of each mobile terminal, packets addressed to the mobile terminal are sent to the home network of the mobile terminal. In addition, communication between mobile terminals is possible by transferring the data to mobile terminals by a home agent. These more detailed contents are described in, for example, the republication WO2000076247 and the patent 3293761.

[0015] IMS (IP Multimedia Subsystem) power 3GPP (3rd Generation) incorporating IP and SIP (Session Initiation Protocol) technology as a technology to realize multimedia services on the network of mobile terminals that communicate as described above Standardized by Partnership Project).

[0016] In order to receive IMS services, ΊΡ Multimedia Subsystem (IMS); Stage 2 3G PP TS23.228 ver.6.8.0, <http://www.3gpp.org/ftp/Specs/latest/Rel- As specified in 6 / 23_series / 23228-680.zip>, the mobile terminal performs a session via a P—CSCF (Proxy- Call Session Control Function) server, which is a session control server in the visited network. Control is performed and communication is started.

FIG. 3 is a diagram showing a communication operation for receiving the IMS service.

[0018] The home network 10 of the mobile terminal 30 is provided with an S-CSCF (Serving-Call Session Control Function) server 70 and a home agent 50, and the visited network 20 where the mobile terminal is currently located is provided. An edge router 40 and a P—CSCF Sano 60 are provided.

The home agent 50 manages the CoA of the mobile terminal 30 in the visited network 20. S—CSCF70 is a SIP server that provides various multimedia services in cooperation with HSS (Home Subscriber Server) 80 that manages user authentication and subscriber data. The edge router 40 is responsible for data transmission between the subordinate mobile terminal 30 and the home agent 50. P—CSCF server 60 is the SIP server that mobile terminal 30 accesses first, and the SIP message transmitted from mobile terminal 30 is sent to the home network. Transfer to S—CSCF70 at

[0020] The procedure for registration with IMS will be described. In FIG. 3, the broken line arrow indicates the upward direction of the force from the mobile terminal 30 to the HSS 80, and the solid line arrow indicates the downward direction of the force from the HSS 80 to the mobile terminal 30. When the mobile terminal 30 moves to the visited network 20, it registers with the IMS to receive the multimedia service in the visited network 20. When the mobile terminal 30 transmits a register message of the mobile terminal 30 including the subscriber information and home address of the mobile terminal 30 and the destination address is P—CSCF server 60, the edge router 40 that has received the register message is present in the visited network 20. P—Send to CSCF server 60. When the P—CSCF server 60 receives the Register message, it registers the subscriber information and home address of the mobile terminal 30, reconstructs the Register message, and sends it to the S—CSCF 70. When S-CSCF 70 confirms the validity of the subscriber information contained in the Register message via HS S80, it registers the information of mobile terminal 30 and the address of P—CSCF server 60, and sends an OK message to P—CSCF. Send to server 60. P CSCF server 60 transfers to mobile terminal 30. The destination at this time is the home address of the mobile terminal 30 included in the Register message. For this reason, a packet is delivered from the P—CSCF server 60 to the mobile terminal 40 via the home agent 50 and the edge router 40 placed on the home network 10.

Disclosure of the invention

Problems to be solved by the invention

[0021] According to the IMS registration procedure described above, since the P—CSCF server is configured to manage the home address of the mobile terminal, communication from the P—CSCF Sano to the mobile terminal is performed in the downward direction. In some cases, there is a problem that the communication route becomes redundant and the delay time becomes long because it always passes through a home agent placed in the home network.

[0022] The present invention has been made in view of the problems of the conventional technology as described above, and is intended to realize a packet transfer system and method capable of shortening a communication path and shortening a delay time. Objective.

Means for solving the problem

[0023] The packet transfer system of the present invention transfers a packet transmitted from a mobile terminal to a server. A packet forwarding system for sending and replying,

An edge router and a front-end processing device that exist between communication paths between the mobile terminal and the server,

The edge router includes a capsule address list in which an address of the server is described as an internal destination address, and an address of the front-end processing device corresponding to the address of the server is described as an external destination address. When the packet transmitted from the server to the server is received, the capsule address list is referred to, the address of the front-end processing device described corresponding to the server address is set as the external destination address, The address is encapsulated as an external source address and transferred to the front-end processing unit. When a self-encapsulated packet is received, the capsule is removed, and the packet with the internal source address and internal destination address is received. Forward to the destination address,

When the front-end processing device receives the encapsulated packet addressed to itself, the front-end processing device removes the capsule and transfers the packet based on the internal source address and the internal destination address to the internal destination address, as well as the internal source address and the external source. A binding list in which addresses are associated is generated, and when a packet whose destination address is the address of the mobile terminal is received, the binding list is referred to and described as an external destination address corresponding to the address of the mobile terminal. The edge router address as an external destination address and the external source address as its own address are encapsulated and transferred to the edge router.

The edge router of the present invention comprises a packet transfer system that forwards and returns a packet transmitted to and from a mobile terminal, together with a front-end processing device that exists between communication paths between the mobile terminal and the server. An edge router that

An information storage for storing a memory address list and its own address in which the address of the server is described as an internal destination address and the address of the front-end processing device corresponding to the address of the server is described as an external destination address And

An encapsulation processor that performs packet encapsulation;

A decapsulation processing unit for decapsulating the packet; When the mobile terminal power accepts a packet transmitted to the server, the address of the front-end processing device described with reference to the address of the server is referred to the external destination address with reference to the address list of the server. When the capsule processing is performed by the capsule processing unit using the self address as the external transmission source address and transferred to the front end processing unit, and the capsule packet addressed to itself is received, the decapsulation processing unit And a determination control unit that performs decapsulation and transfers a packet based on the internal source address and the internal destination address to the internal destination address.

[0025] The front-end processing device of the present invention includes a packet transfer system that transfers a packet transmitted from a mobile terminal to a server and returns the packet together with an edge router that exists between communication paths between the mobile terminal and the server. An information storage unit that stores a nodding list in which an internal source address and an external source address are associated with each other and a self-address,

An encapsulation processor that performs packet encapsulation;

A decapsulation processing unit for decapsulating the packet;

Upon receiving the encapsulated packet addressed to itself, the decapsulation processing unit performs decapsulation processing to remove force encapsulation, and forwards the packet with the internal source address and the internal destination address to the internal destination address. An internal source address and an external source address are registered in association with the nodding list, and when a packet whose destination address is the address of the mobile terminal is received, the binding list is referred to and the address of the mobile terminal is The edge router address described as an external destination address is used as the external destination address, and the process of encapsulating the external source address as its own address is performed by the capsule processor and transferred to the edge router. A judgment control unit. To.

[0026] A packet transfer system according to another aspect of the present invention is a packet transfer system that transfers a packet transmitted by a mobile terminal to a server and sends it back, between the communication path between the mobile terminal and the server. An edge router that exists, and the edge router is a power in which the address of the server is described as an internal destination address. A packet address list, and when a packet transmitted from the mobile terminal to the server is received, the capsule address list is referred to, the server address is set as an external destination address, and the self address is set as an external source. Encapsulated as an address, transferred to the server, and when a self-encapsulated packet is received, the capsule is removed, and the packet with the internal source address and internal destination address is transferred to the internal destination address.

When the server receives the encapsulated packet addressed to itself, it removes the capsule and forwards the packet with the internal source address and the internal destination address to the internal destination address, and at the same time, compares the internal source address and the external source address. An associated binding list is generated, and when the packet whose destination address is the address of the mobile terminal is transmitted, the binding list is referred to and described as an external destination address corresponding to the address of the mobile terminal. The edge router address as an external destination address and the external source address as its own address are encapsulated and transferred to the edge router.

An edge router according to another aspect of the present invention is an edge router that exists between communication paths between the mobile terminal and the server constituting a packet transfer system for transferring a packet transmitted by a mobile terminal to a server. ,

An information storage unit for storing a capsule address list in which the address of the server is described as an internal destination address and its own address;

An encapsulation processor that performs packet encapsulation;

A decapsulation processing unit for decapsulating the packet;

Upon receiving a packet transmitted to the server, the mobile terminal power refers to the cab cell address list, encapsulates the server address as an external destination address and its own address as an external source address. When the encapsulated processing unit transfers the packet to the server and receives the encapsulated packet addressed to itself, the decapsulating processing unit performs decapsulation, and the packet based on the internal source address and the internal destination address is received. And a judgment control unit for forwarding to the internal destination address. [0028] The server of the present invention is a server that receives a packet transmitted by the mobile terminal through an edge router,

An information storage unit that stores a binding list in which an internal source address and an external source address are associated with each other, and an own address;

An encapsulation processor that performs packet encapsulation;

A decapsulation processing unit for decapsulating the packet;

Upon receiving the encapsulated packet addressed to itself, the decapsulation processing unit performs decapsulation processing to remove force encapsulation, and forwards the packet with the internal source address and the internal destination address to the internal destination address. An internal source address and an external source address are registered in association with the nodding list, and the address of the mobile terminal is referred to when the packet whose destination address is the address of the mobile terminal is transmitted. The edge router address is described as an external destination address, and the capsule processor is configured to perform the process of encapsulating the external source address as its own address. And a judgment control unit for transferring to the data.

[0029] A packet transfer system according to still another aspect of the present invention is a packet transfer system for transferring a packet transmitted by a mobile terminal to a server and returning the packet.

An edge router, a front-end processing device, and a MAP that exist between communication paths between the mobile terminal and the server;

The edge router includes a capsule address list in which an address of the server is described as an internal destination address, and an address of the front end processing device corresponding to the address of the server is described as an external destination address. The terminal manages RCoA, which is a CoA created in the subnet held by the MAP, and LCoA, which is a CoA created in the subnet held by the edge router, corresponding to the home address, and When the packet transmitted to the server is received, the capsule terminal address list is referred to, the address of the front-end processing device described in correspondence with the address of the server is set as an external destination address, and the mobile terminal RCoA is encapsulated as an external source address and To front-end processing equipment Forward, receive the encapsulated packet destined for RCoA or LCoA, unencapsulate, send packet with internal source address and internal destination address to internal destination address ¾5,

When the front-end processing device receives the encapsulated packet addressed to itself, the front-end processing device removes the capsule and transfers the packet based on the internal source address and the internal destination address to the internal destination address, as well as the internal source address and the external source. A binding list in which addresses are associated is generated, and when a packet whose destination address is the address of the mobile terminal is received, the binding list is referred to and described as an external destination address corresponding to the address of the mobile terminal. Encapsulating the RCoA of the mobile terminal as an external destination address and the external source address as its own address, and transferring to the MAP.

The MAP manages the RCoA and LCoA of the mobile terminal in association with each other. When a packet having a destination address of RCoA is received, the LCoA corresponding to the RCoA that is the destination address of the received packet is set as the external destination address, and its own address Is transferred to the edge router as a packet encapsulated as an external source address.

An edge router according to still another embodiment of the present invention provides a front-end processing device in which a packet transfer system for transferring a packet transmitted from a mobile terminal to a server and returning the packet is present between communication paths between the mobile terminal and the server. And an edge router configured with MAP,

The server address is described as an internal destination address, the address of the front end processing device corresponding to the server address is described as an external destination address, and the mobile terminal address list. A binding cache that manages RCoA, which is a CoA created in a subnet held by the MAP, and an LCoA, which is a CoA created in a subnet held by the edge router, corresponding to a home address, and stores its own address An information storage unit to

An encapsulation processor that performs packet encapsulation;

A decapsulation processing unit for decapsulating the packet;

When the mobile terminal power receives a packet transmitted to the server, Referring to the cell address list and the binding cache, the address of the front-end processing device described corresponding to the address of the server is set as the external destination address, and the RCoA of the mobile terminal is encapsulated as the external source address Processing is performed by the encapsulation processing unit and transferred to the front-end processing unit. When a capsuled packet addressed to RCoA or LCoA is received, decapsulation processing is performed to remove the capsule from the decapsulation processing unit. And a determination control unit that forwards a packet with an internal source address and an internal destination address to the internal destination address.

[0031] A front-end processing device according to another aspect of the present invention transfers a packet transmitted from a mobile terminal to a server, and returns a packet transfer system between communication paths between the mobile terminal and the server. A front-end processing device configured with existing edge routers and MAPs,

An encapsulation processor that performs packet encapsulation;

A decapsulation processing unit for decapsulating the packet;

Upon receiving the encapsulated packet addressed to itself, the decapsulation processing unit performs decapsulation processing to remove force encapsulation, and forwards the packet with the internal source address and the internal destination address to the internal destination address. An internal source address and an external source address are registered in association with the nodding list, and when a packet whose destination address is the address of the mobile terminal is received, the binding list is referred to and the address of the mobile terminal is Described as an external destination address, the RCoA of the mobile terminal is set as the external destination address, and the process of encapsulating the external source address as its own address is performed by the encapsulation processing unit and transferred to the MAP. And a judgment control unit.

[0032] The MAP of the present invention transfers a packet, which has also been transmitted by the mobile terminal, to the server, and sends back a packet transfer system that exists between the communication path between the mobile terminal and the server. MAP configured with An information storage unit that stores a binding cache that manages RCoA and LCoA of the mobile terminal in association with each other, and an own address;

An encapsulation processor that performs packet encapsulation;

When an RCoA packet whose destination address is managed in the binding cache is received, the LCoA corresponding to the RCoA that is the destination address of the received packet is set as the external destination address, and the own address is encapsulated as the external source address And a determination control unit that causes the encapsulation processing unit to perform transfer to the edge router.

A packet transfer system according to still another aspect of the present invention is a packet transfer system for transferring a packet transmitted by a mobile terminal to a server and returning the packet.

An edge router and a MAP existing between communication paths between the mobile terminal and the server,

The edge router has a force address list in which the address of the server is described as an internal destination address, and the RCoA that is a CoA created by the subnet held by the MAP for the mobile terminal. The LCoA, which is a CoA created in the subnet held by the edge router, is managed in correspondence with the home address, and when the packet transmitted from the mobile terminal to the server is received, the capsule address list is updated. The address of the server is set as the external destination address, the RCoA of the mobile terminal is encapsulated as the external source address, transferred to the server, and the encapsulated packet addressed to RCoA or LCoA is received. Remove the trap and forward the packet with the internal source address and internal destination address to the internal destination address And

When the server receives the encapsulated packet addressed to itself, it removes the capsule and forwards the packet with the internal source address and the internal destination address to the internal destination address, and at the same time, compares the internal source address and the external source address. An associated binding list is generated, and when the packet whose destination address is the address of the mobile terminal is transmitted, the binding list is referred to and described as an external destination address corresponding to the address of the mobile terminal. Encapsulating the mobile terminal RCoA as an external destination address and the external source address as its own address and transferring it to the MAP, The MAP manages the RCoA and LCoA of the mobile terminal in association with each other. When a packet having a destination address of RCoA is received, the LCoA corresponding to the RCoA that is the destination address of the received packet is set as the external destination address, and its own address Is transferred to the edge router as a packet encapsulated as an external source address.

An edge router according to still another embodiment of the present invention is an edge router that exists between communication paths between the mobile terminal and the server that constitute a packet forwarding system that forwards packets transmitted by the mobile terminal to the server. Because

A capsule address list in which the address of the server is described as an internal destination address, an RCoA that is a CoA created by the mobile terminal in the subnet held by the MAP, and a subnet held by the edge router A binding cache that manages LCoA, which is a created CoA, corresponding to a home address, an information storage unit that stores its own address,

An encapsulation processor that performs packet encapsulation;

A decapsulation processing unit for decapsulating the packet;

Upon receiving a packet transmitted to the server, the mobile terminal power refers to the capsule address list and the binding cache, uses the server address as an external destination address, and uses the mobile terminal RCoA as an external source address. Encapsulation processing is performed by the encapsulation processing unit and transferred to the server. When a capsuled packet addressed to RCoA or LCoA is received, the decapsulation processing unit performs decapsulation processing, and the internal transmission source And a determination control unit that transfers a packet based on the address and the internal destination address to the internal destination address.

[0035] A server according to another aspect of the present invention is a server for receiving a packet transmitted by a mobile terminal via an edge router,

An encapsulation processor that performs packet encapsulation;

A decapsulation processing unit for decapsulating the packet;

When the encapsulated packet addressed to itself is received, the decapsulation processing unit receives the decapsulated packet. Encapsulation processing is performed to forward packets with the internal source address and internal destination address to the internal destination address, and the internal source address and external source address are registered in the binding list in association with each other. When the packet that is the address of the mobile terminal is transmitted, the binding list is referred to, the RCoA of the mobile terminal described as the external destination address corresponding to the address of the mobile terminal is set as the external destination address, and the external destination address is set. And a determination control unit that causes the encapsulation processing unit to perform a process of encapsulating a transmission source address as its own address and transferring it to the MAP.

[0036] A packet transfer system according to still another embodiment of the present invention is a packet transfer system that transfers a packet transmitted from a mobile terminal to a server and returns the packet.

A front-end processing device existing between communication paths between the mobile terminal and the server,

The mobile terminal includes a capsule address list in which an address of the server is described as an internal destination address, and an address of the front-end processing device corresponding to the address of the server is described as an external destination address. When referring to the capsule address list, the address of the front-end processing device described corresponding to the address of the server is set as the external destination address, and its own CoA is set as the external source address. And then forwards it to the front-end processing unit. When receiving an encapsulated packet addressed to its own CoA, the encapsulation is removed.

When the front-end processing device receives the encapsulated packet addressed to itself, the front-end processing device removes the capsule and transfers the packet based on the internal source address and the internal destination address to the internal destination address, as well as the internal source address and the external source. A binding list in which addresses are associated is generated, and when a packet whose destination address is the address of the mobile terminal is received, the binding list is referred to and described as an external destination address corresponding to the address of the mobile terminal. The CoA of the mobile terminal is used as an external destination address, and the external source address is encapsulated as its own address and transferred to the mobile terminal.

[0037] The mobile terminal of the present invention sends a packet transmission to a server and a reply from the server. A mobile terminal that performs through a front-end processing device that exists between communication paths with a server,

An information storage that stores a power address list in which the address of the server is described as an internal destination address, and the address of the front-end processing device corresponding to the address of the server is described as an external destination address and its own CoA And

An encapsulation processor that performs packet encapsulation;

A decapsulation processing unit for decapsulating the packet;

When transmitting to the server, the capsule address list is referred to, the address of the front-end processing device described corresponding to the server address is set as the external destination address, and its own CoA is set. Processing to encapsulate as an external source address is performed by the capsule processing unit and transferred to the front-end processing unit. When a capsuled packet addressed to its own CoA is received, it is encapsulated in the decapsulation processing unit. And a determination control unit that performs decapsulation processing to remove the decapsulation.

A packet transfer system according to still another aspect of the present invention is a packet transfer system for transferring a packet transmitted from a mobile terminal to a server and returning the packet.

A front-end processing device and a MAP that exist between communication paths between the mobile terminal and the server,

The mobile terminal includes a capsule address list in which an address of the server is described as an internal destination address, and an address of the front-end processing device corresponding to the server address is described as an external destination address. When RCoA, which is a CoA created in the subnet held by the MAP, and LCoA, which is a CoA created in the subnet in which the service is located, are managed according to the home address and sent to the server Referring to the capsule address list, the address of the front-end processing device described corresponding to the address of the server is set as the external destination address, and the RCoA of the mobile terminal is encapsulated as the external source address. Forward to the front-end processing unit and encapsulate for RCoA or LCoA Remove the Kapuserui spoon was when received to signal the packet, When the front-end processing device receives the encapsulated packet addressed to itself, the front-end processing device removes the capsule and transfers the packet based on the internal source address and the internal destination address to the internal destination address, as well as the internal source address and the external source. A binding list in which addresses are associated is generated, and when a packet whose destination address is the address of the mobile terminal is received, the binding list is referred to and described as an external destination address corresponding to the address of the mobile terminal. Encapsulating the RCoA of the mobile terminal as an external destination address and the external source address as its own address, and transferring to the MAP.

A mobile terminal according to another aspect of the present invention is a mobile terminal that performs packet transmission to a server and a reply from the server via a front-end processing device and a MAP that exist between communication paths with the server. ,

The address of the server is described as an internal destination address and the address of the front-end processing device corresponding to the address of the server is described as an external destination address, and the subnet held by the MAP about itself An information storage unit that stores a binding cache that manages RCoA, which is a CoA created in, and an LCoA, which is a CoA created in the subnet in which it is located, corresponding to the home address, and encapsulation that performs packet encapsulation A processing unit;

A decapsulation processing unit for decapsulating the packet;

When transmitting to the server, referring to the capsule address list, the address of the front-end processing device described corresponding to the server address is set as the external destination address, and the mobile terminal Processing to encapsulate RCoA as an external source address is performed by the encapsulation processing unit, forwarded to the front-end processing device, and receives the encapsulated packet addressed to RCoA or LCoA. Decision control unit that causes the capsule to perform decapsulation processing It is characterized by having.

[0040] A packet transfer system according to still another aspect of the present invention is a packet transfer system for transferring a packet transmitted from a mobile terminal to a server and returning the packet.

The edge router includes a capsule address list in which an address of the server is described as an internal destination address, and an address of the MAP corresponding to the address of the server is described as an external destination address. The RCoA, which is a CoA created in the subnet held by the network, and the LCoA, which is a CoA created in the subnet held by the edge router, are managed according to the home address, and the mobile terminal power When the received packet is received, the encapsulated address list is referred to and described in correspondence with the address of the server! The MAP address is used as the external destination address, and the RCoA of the mobile terminal is externally transmitted. Encapsulated as the original address and forwarded to the MAP, encapsulated for RCoA or LCoA Remove the Kapuserui spoon when receiving the packet, forwards the packet by the internal source address and the internal destination address to an internal destination address,

When the MAP manages the RCoA and LCoA of the mobile terminal in correspondence with each other and receives a force-packeted packet addressed to itself, the MAP removes the capsule and internally transmits the packet based on the internal source address and the internal destination address. A forwarding list is generated and a nodding list in which an internal source address is associated with an external source address is generated. When a packet whose destination address is the address of the mobile terminal is received, the binding list is referred to. It is described as an external destination address corresponding to the address of the mobile terminal, and is transferred as a packet encapsulated with the RCoA of the mobile terminal as an external destination address and its own address as an external source address. When an RCoA packet is received, the RCoA that is the destination address of the received packet The response to LCoA and external destination address, characterized by transferring the Kapuserui spoon packet its own address as the external source address to the edge router.

[0041] An edge router according to still another embodiment of the present invention can transmit a packet transmitted by a mobile terminal. A packet transfer system for transferring to and returning from a server, an edge router configured with a MAP existing between communication paths between the mobile terminal and the server,

The address of the server is described as an internal destination address, the capsule address list in which the address of the MAP corresponding to the address of the server is described as an external destination address, and the MAP holds by the mobile terminal Encapsulates information packets that store the RCoA, which is a CoA created in the subnet, and the nodding cache that manages the LCoA, which is a CoA created in the subnet held by the edge router, corresponding to the home address An encapsulation processor;

A decapsulation processing unit for decapsulating the packet;

The mobile terminal power is described in correspondence with the address of the server by referring to the capsule address list upon receiving a packet transmitted to the server.

The MAP address is used as an external destination address and the RCoA of the mobile terminal is encapsulated as an external source address. The capsule processing unit performs the process of encapsulating the address and transferring it to the MAP. A decision control unit that causes the decapsulation processing unit to perform decapsulation processing to remove the capsule when the received packet is received and forwards the packet based on the internal source address and the internal destination address to the internal destination address. Features.

The MAP according to another aspect of the present invention configures a packet transfer system that forwards a packet transmitted by the mobile terminal to the server and returns the packet together with an edge router that exists between the communication path between the mobile terminal and the server. MAP,

A binding cache that manages the RCoA and LCoA of the mobile terminal in association with each other, a nodding list in which an internal source address and an external source address are associated, and an information storage unit that stores its own address;

An encapsulation processor that performs packet encapsulation;

A decapsulation processing unit for decapsulating the packet;

When the encapsulated packet addressed to itself is received, the decapsulation processing unit performs decapsulation processing to remove the power and cancels the internal source address and the internal destination address. The packet with the address is transferred to the internal destination address, the internal source address and the external source address are registered in the binding list, and the packet is referenced when the destination address is the address of the mobile terminal. And the capsule processor processing unit encapsulates the mobile terminal R CoA described as the external destination address corresponding to the mobile terminal address as the external destination address and the own address as the external source address. When a packet whose destination address is RCoA is received, the LCoA corresponding to the RCoA that is the destination address of the received packet is set as the external destination address, and the own address is encapsulated as the external source address. Let the encapsulation processing unit perform the And a decision control unit for forwarding to the router.

A packet transfer system according to still another aspect of the present invention is a packet transfer system configured by a mobile terminal and a MAP,

The mobile terminal is provided with a force address list in which the address of the server is described as an internal destination address, and the address of the MAP corresponding to the address of the server is described as an external destination address. When managing RCoA, which is a CoA created in the subnet to be held, and L CoA, which is a CoA created in the subnet in which it is located, corresponding to the home address and sending it to the server, Referring to the capsule address list, the address of the MAP described in correspondence with the address of the server is set as an external destination address, and the RCoA of the mobile terminal is encapsulated as an external source address to map the MAP. Transfer to the RCoA and receive the encapsulated packet addressed to the RCoA or LCoA.

When the MAP manages the RCoA and LCoA of the mobile terminal in correspondence with each other and receives a force-packeted packet addressed to itself, the MAP removes the capsule and internally transmits the packet based on the internal source address and the internal destination address. A forwarding list is generated and a nodding list in which an internal source address is associated with an external source address is generated. When a packet whose destination address is the address of the mobile terminal is received, the binding list is referred to. It is described as an external destination address corresponding to the address of the mobile terminal, the RCoA of the mobile terminal is the external destination address, and its own address is the external source address When a packet with a destination address of RCoA is received, the LCoA corresponding to the RCoA that is the destination address of the received packet is set as the external destination address, and its own address is set as the external source address. The packet is forwarded as a packet to the edge router.

[0044] A mobile terminal according to still another aspect of the present invention is a mobile terminal that performs packet transmission to a server and a reply from the server via a MAP that exists between communication paths with the server. And

The address of the server is described as an internal destination address, the MAP address corresponding to the address of the server is created as a capsule address list in which the address of the server is described as an external destination address, and a subnet held by the MAP about itself An information storage unit that stores a binding cache that manages RCo A that is a CoA and an LCoA that is a CoA created in a subnet in which the CoA is located, corresponding to a home address;

An encapsulation processor that performs packet encapsulation;

A decapsulation processing unit for decapsulating the packet;

In the case of transmission to the server, the capsule address list is referred to, the MAP address described corresponding to the server address is set as the external destination address, and the RCoA of the mobile terminal is set. Decapsulation that decapsulates to the decapsulation processing unit when the encapsulation processing unit performs the process of encapsulating as an external source address, forwards it to the MAP, and receives the encapsulated packet addressed to RCoA or LCoA And a judgment control unit for performing the digitization process.

[0045] A program according to the present invention is a program for realizing each of the above-described components by a computer system, and a recording medium according to the present invention stores the above-described program.

[0046] In the present invention configured as described above, referring to the capsule address list, the registered server is encapsulated and transferred. The ability to release this capsule before processing by the server is performed. At that time, a binding list that associates the internal source address with the external source address is generated, and the reply from the server passes through the home agent. Without being sent to the external source registered in the binding list. The invention's effect

[0047] In transmission in the downstream direction, transmission is performed from the visited network to the mobile terminal without going through the home network, so that the communication path can be shortened.

Brief Description of Drawings

[0048] FIG. 1 is a diagram showing a configuration of a mobile communication network based on Mobile IPv6.

[FIG. 2] Each of (a) to (c) is a diagram showing a configuration of an IP packet.

FIG. 3 is a diagram showing a communication operation for receiving an IMS service.

FIG. 4 is a block diagram showing a configuration of a first exemplary embodiment of a packet transfer system configured according to the present invention.

5 is a diagram showing a configuration of the edge router 140 in FIG.

6 is a diagram showing registration contents of an encapsulated address list 401 in FIG.

FIG. 7 is a flowchart showing the operation of the edge router 140 in FIG.

8 is a diagram showing the configuration of the front end processing device 190 in FIG.

FIG. 9 is a diagram showing registered contents of the binding list in FIG. 8.

FIG. 10 is a flowchart showing an operation of the front end processing device 190 in FIG.

FIG. 11 is a diagram showing the operation of the first exemplary embodiment together with header information.

FIG. 12 is a block diagram showing a configuration of a second exemplary embodiment of a packet transfer system configured according to the present invention.

FIG. 13 is a diagram showing a configuration of the edge router 240 in FIG.

FIG. 14 is a flowchart showing the operation of the edge router 240 in FIG.

FIG. 15 is a flowchart showing the operation of the front-end processing device 290 in FIG.

FIG. 16 is a diagram showing the operation of the second exemplary embodiment together with header information.

FIG. 17 is a block diagram showing a configuration of a third exemplary embodiment of a packet transfer system configured according to the present invention.

FIG. 18 is a block diagram showing a configuration of a P-CSCF server 1160 in FIG.

FIG. 19 is a diagram showing the operation of the third exemplary embodiment together with header information.

FIG. 20 is a block diagram showing the configuration of the fourth embodiment of the packet transfer system according to the present invention. FIG.

21] FIG. 21 is a diagram showing the operation of the fourth exemplary embodiment together with header information.

[22] FIG. 22 is a block diagram showing the configuration of the fifth example of the packet transfer system configured according to the present invention.

FIG. 23 is a block diagram showing a configuration of mobile terminal 1130 in FIG.

[24] FIG. 24 is a diagram showing the operation of the fifth exemplary embodiment together with header information.

[25] FIG. 25 is a block diagram showing a configuration of a sixth example of the packet transfer system configured according to the present invention.

FIG. 26 is a block diagram showing a configuration of mobile terminal 1230 in FIG. 25.

27] FIG. 27 is a diagram showing the operation of the sixth exemplary embodiment together with header information.

[28] FIG. 28 is a block diagram showing a configuration of a seventh embodiment of the packet transfer system configured according to the present invention.

FIG. 29 is a block diagram showing a configuration of MAP 1200 in FIG.

[30] FIG. 30 is a diagram showing the operation of the seventh exemplary embodiment together with header information.

[31] FIG. 31 is a block diagram showing a configuration of an eighth embodiment of a packet transfer system configured according to the present invention.

[32] FIG. 32 is a diagram showing the operation of the eighth exemplary embodiment together with header information.

Explanation of symbols

110, 210 Home Network

120, 220 network

130, 230 Mobile terminal

140, 240 edge norator

150, 250 Home Agent

160, 260 P-CSCF

170, 270 S-CSCF

180 HSS

200 MAP

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the present invention will be described with reference to the drawings.

[0051] First Example

FIG. 4 is a block diagram showing the configuration of the first embodiment of the packet transfer system constructed according to the present invention. In FIG. 4, the home network 110, the visited network 120, the mobile terminal 130, the home agent 150, the P-CSCF160, the S—CSCF170, and the HSS180 are the home network 10, the visited network 20, and the mobile terminal 30 shown in FIG. , Home Agent 50, P—CSCF60, S—CSCF70, HSS80. In this embodiment, an edge router (ER) 140 and a front end processing device (FE) 190 are provided in addition to these components. The visited network 20 is an integrated network of multiple edge routers, and only one mobile terminal 130, edge router 140, P-CSCF160, and front-end processing device 190 are shown in FIG. However, there are actually a plurality of them.

[0052] The edge router 140 in this embodiment includes an encapsulated address list in which the address of the front-end processing device 190 is registered in association with the address of the P-CSCF 160, and is registered in the encapsulated address list. The packet addressed to the address of P-CSCF160 has a function of encapsulating the destination address as the address of the associated front-end processing device 190 and encapsulating the transmission source address as its own address.

FIG. 5 is a diagram showing a main configuration of the edge router 140 in FIG. As shown in FIG. 5, the edge router 140 includes an information storage unit 400 that stores an encapsulated address list 401 and an ER address 4002, which is its own address, a determination control unit 403, an interface unit 404, and an encapsulation process. A unit 405, a decapsulation processing unit 406, a routing processing unit 407, and a force are included.

The determination control unit 403 refers to the contents stored in the information storage unit 400 for the packet transmitted / received via the interface unit 404, and controls the processing content performed by each unit according to the result. The encapsulation processing unit 405 and the decapsulation processing unit 406 perform the capsule processing and the decapsulation processing according to the control of the judgment control unit 403, respectively. Processing unit 40 7 and the interface unit 404.

FIG. 6 is a diagram showing the registered contents of the encapsulated address list 401. Actually, the power to register the specific addresses of P-CSCF160 and front-end processor 190 In order to facilitate understanding, the names of P-CSCF160 and front-end processor 190 are changed to their respective addresses. Show. As shown in Figure 6, P-CSCF160 ~ 1

1

The addresses of the front-end processing devices 190 to 190 are registered at 60 addresses.

2 1 2

FIG. 7 is a flowchart showing the operation of the edge router 140.

When receiving the packet (step S601), the judgment control unit 403 refers to the ER address 402 and confirms whether the destination address is its own address (step S602). If the packet is addressed to itself, it is decapsulated (step S603), transferred to the internal destination address (step S604), and the process ends. If it is confirmed in step S602 that the destination address is not its own address, the encapsulated address list 401 shown in FIG. 6 is searched (step S605), and the destination address is registered in the encapsulated address list 401. It is confirmed whether it is done (step S606). If the destination address is registered in the encapsulated address list 401, the address of the corresponding front-end processing device 190 registered as the external destination address is encapsulated as its own address as the external source address. (Step S607), transfer to the external destination address (Step S608), and end. If it is confirmed in step S606 that the destination address is registered in the encapsulated address list 401 !, NA! /, It is transferred to the destination address (step S609), and the process ends.

FIG. 8 is a diagram showing a main configuration of the front end processing device 190 in FIG. As shown in FIG. 8, the front-end processing device 190 includes an information storage unit 500 that stores a binding list 501 and an FE address 502 that is its own address, a list registration processing unit 503, a determination control unit 504, An interface unit 505, an encapsulation processing unit 506, a decapsulation processing unit 507, and a routing processing unit 508 are included.

The determination control unit 504 refers to the contents stored in the information storage unit 500 for the packets transmitted / received via the interface unit 505, and controls the processing contents performed by each of the above units according to the result. The list registration processing unit 503 performs registration processing in the information storage unit 500 according to the control of the judgment control unit 504, and the encapsulation processing unit 506 and the decapsulation unit The processing unit 507 performs capsule processing and decapsulation processing according to the control of the judgment control unit 504! /, And sends the processed packets to the outside, such as the routing processing unit 508 and the interface unit. Via 505.

[0060] When receiving a packet whose destination address is the address of the front-end processing device 190 and whose source address is encapsulated by the address of the edge router 140, the judgment control unit 504 receives the internal source address and the external source address. A noindin list 501 associated with is generated. FIG. 9 shows the registration contents of the binding list. Actually, the power to register the specific addresses of the mobile terminal 130 and the edge router 140 Here, in order to facilitate understanding, the names of the mobile terminal 130 and the edge router 140 are changed to the respective addresses. . As shown in Figure 9, the addresses of mobile terminals 130-130

1 2 contains the addresses of edge routers 140-140.

1 2

FIG. 10 is a flowchart showing the operation of the front end processing device 190.

[0062] When receiving the packet (step S501), the judgment control unit 504 refers to the FE address 502 and confirms whether the destination address is its own address (step S502). If the packet is addressed to itself, it is decapsulated (step S503), and a binding list 501 in which the internal source address and external source address shown in FIG. 9 are associated with each other is generated (step S504). The destination address is transferred as the destination address (step S505), and the process ends. If it is confirmed in step S502 that the destination address is not its own address, the binding list 501 shown in FIG. 9 is searched to check whether the destination address is registered as the internal source address (step S502). S507). If the destination address is registered as a source address in the binding list 501, the corresponding external source address is encapsulated as the external destination address, and its own address is encapsulated as the external source address (step S508) and transferred. (Step S509) is completed. If it is confirmed that the destination address is registered as an internal source address in the binding list 501 in step S507, the destination address is transferred to the destination address as it is (step S510) and the process is terminated.

[0063] The edge router 140 and the front-end processing device 190 are configured by a general computer system including an input device, an output device, a storage device, and a control device. Therefore, the above capsule address list and binding list are stored in a storage device.

[0064] FIG. 11 is a diagram showing the operation when the mobile terminal 130 is registered in the user power MS together with the header information with the edge router 140 and the front-end processing device 190 as the center. The specific operation of the embodiment will be described with reference to FIG. 4 and FIG.

In FIG. 4, the broken line arrow indicates the upward direction of the force from the mobile terminal 130 to the HSS 180, and the solid line arrow indicates the downward direction of the direction force from the HSS 180 to the mobile terminal 130.

[0066] (1) When the mobile terminal 130 moves to the visited network 120, it registers with the IMS in order to receive multimedia services in the visited network 120.

[0067] When the mobile terminal 130 transmits the register message of the mobile terminal 130 including the subscriber information of the mobile terminal 130, the source address is the mobile terminal 130, and the destination address is P—CSCF server 160, the register The message is received by the edge router 140 under the control of the mobile terminal 130. The edge router 140 confirms the destination address of the received Register message and confirms whether it is in the encapsulated address list shown in FIG. In this case, since the destination address is P—CSCF server 160 and is registered in the encapsulated address list, the front-end processing device 190 associated with the destination address is set as the external destination address, and the self (edge router) 140) is encapsulated as an external source address and transferred to the front-end processing device 190.

(2) When the front-end processing device 190 receives the packet transferred from the edge router 140, it checks the destination address. In this case, since the destination address is addressed to itself, decapsulation is performed to remove the capsule, the internal source address (mobile terminal 130) is set as the source address, and the internal destination address (P-CSCF server 160) is set as the destination address. The packet is transferred to the P—CSCF server 160. When decapsulation is performed, a binding list in which the internal transmission source address (mobile terminal 130) is associated with the external transmission source address (edge router 140) is generated.

[0069] (3) P—When the CSCF server 160 receives the packet transferred from the front-end processing device 190, it registers the subscriber information and home address of the mobile terminal 30, and registers the message This packet is reconfigured to generate a packet with the source address as self (P—CSCF server 160) and the destination address as S CSCF server 170, and forward to S CSCF server 170.

[0070] (4) When the S—CSCF server 170 receives the packet transferred from the P—CSCF server 160, the S—CSCF server 170 confirms the validity of the subscriber information included in the Register message via the HSS 180, and the mobile terminal 130 Information and the address of the P—CSCF server 160 are registered, and an OK message is transmitted to the P-CSCF server 160 with the source address as S—CSCF server 170 and the destination address as P—CSCF server 160.

[0071] (5) P—The CSCF server 160 uses the destination address of the received packet as the home address of the mobile terminal 130 contained in the Register message, and sets the source address as its own (P—CSC F server 160). Transfer to processing device 190. The transfer operation to the front-end processing device 190 here is uniquely performed regardless of the destination address.

(6) When the front-end processing device 190 receives the packet transferred from the P—CSCF server 160, it checks the destination address. In this case, since the destination address is addressed to the mobile terminal 130 that is not addressed to itself, the edge list registered as the external source address corresponding to the mobile terminal 130 of the internal source address is referred to the nodding list. The data 140 is encapsulated as an external destination address, and is self-encapsulated (front-end processing unit 190) as an external source address, and is transmitted to the edge router 140.

(7) When the edge router 140 receives the packet transferred from the front-end processing device 190, it checks the destination address. In this case, since the destination address is addressed to itself, decapsulation is performed to remove the encapsulation, and the packet is transferred to the mobile terminal 130.

[0074] In the present embodiment configured as described above, transmission to a mobile terminal is performed without going through a visited network power home network in downstream communication, and the communication path is shortened. We were able to.

[0075] Second Example

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

FIG. 12 is a block diagram showing a configuration of a second embodiment of the packet transfer system configured according to the present invention.

[0077] In FIG. 10, home network 210, visited network 220, P—CSCF260, S Each of CSCF270 and HSS280 performs the same operation as home network 110, visited network 120, P—CSCF160, S—CSCF170, and HSS180 shown in FIG.

In the present embodiment, the configuration of the present invention is adapted to Hierarchical Mobile IPv6 (hereinafter referred to as HMIPv6), and the visited network 220 is provided with a MAP (Mobile Anchor Point) 200. In HMIPv6, the HoA that is an IP address created in the subnet held by the home agent 250 as the address, the RCoA (Regional Care-of Address) that is the CoA created in the subnet held by the MAP 200, and the edge router 240 LCoA (On-link Care-of Address), which is a CoA created in the subnet that is used, is used.

[0079] The edge router 240 manages the address of the MAP 200 and advertises it to the subordinate mobile terminal together with its own address, and the mobile terminal 230 receives the announcement of the edge router 240 and thereby receives RCoA and LCoA. It generates and notifies the correspondence between HoA and RCoA to home agent 250, and notifies the correspondence between RCoA and LCoA to MAP200. Based on this notification, home agent 250 manages the correspondence between HoA and RCoA of mobile terminal 230, and MAP 200 manages the correspondence between RCoA and LCoA of mobile terminal 230. In addition, the edge router 240 manages all of HoA, RCoA, and LCoA of the mobile terminal 230!

[0080] Similarly to the edge router 140 shown in FIG. 4, the edge router 240 in this embodiment is registered with the address of the front-end processing device 290 associated with the address of the P—CSCF 260! A packet addressed to the P—CSCF260 address registered in the capsule address list is provided with an address list, and the destination address is used as the address of the associated front-end processor 290 for encapsulation. It has a function to transfer data. Here, the difference from the embodiment shown in FIG. 4 is that, in the embodiment shown in FIG. 4, the source address is set as its own address, but in this embodiment, it is encapsulated as R CoA of mobile terminal 230. It is a point to do.

FIG. 13 is a block diagram showing a main configuration of the edge router 240 in the present embodiment.

[0082] As shown in FIG. 13, the edge router 240 manages the encapsulated address list 601 and its own address, the ER address 602, and the HoA, RCoA, and LCoA of the mobile terminal 230. Information storage unit 600 that stores binding cache 603, determination control unit 604, interface unit 605, encapsulation processing unit 606, decapsulation processing unit 607, routing processing unit 608, and HMIP control processing unit 609 Consists of.

The determination control unit 604 refers to the content stored in the information storage unit 600 for the packet transmitted / received via the interface unit 605, and controls the processing content performed by each unit according to the result. The encapsulation processing unit 606 and the decapsulation processing unit 607 perform the capsule processing and the decapsulation processing according to the control of the judgment control unit 604, respectively. This is performed via the processing unit 608 and the interface unit 605. In accordance with the control of the judgment control unit 604, the HMIP control processing unit 609 performs processing necessary for HMIP control, such as changing the contents stored in the binding cache 602.

[0084] When the front-end processing device 290 receives a packet whose destination address is the address of the front-end processing device 290 and whose source address is encapsulated by the RCoA of the mobile terminal 230, the front-end processing device 290 receives the internal source address (mobile terminal ) And an external source address (RCoA) are generated.

Since the configuration of the front-end processing device 290 is the same as the configuration of the front-end processing device 190 in the first embodiment shown in FIG. 8, the following description will be given with reference to FIG.

[0086] Note that the MAP 200, the edge router 240, and the front-end processing device 290 are configured by a general computer system including an input device, an output device, a storage device, and a control device.

14 and 15 show the edge router 240 and the front-end processing device 29, respectively.

It is a flowchart which shows operation | movement of 0.

[0088] Regarding the operation of the present embodiment, first, the operation of the edge router 240 will be described with reference to FIG.

When receiving the packet (step S901), the judgment control unit 604 refers to the binding cache 603 and confirms whether the destination address is RCoA or LCoA managed by itself (step S902). Destination address is addressed to RCoA or LCoA managed by itself If the received packet is a packet, the packet is decapsulated (step S903), transferred to the internal destination address (step S604), and the process ends. If it is confirmed in step S902 that the destination address is managed by RCoA or LCoA! /, The encapsulated address list 601 is searched (step S905), and the destination address is encapsulated. It is confirmed whether it is registered in the generalized address list 601! (Step S906). When the destination address is registered in the encapsulated address list 601, the address of the front-end processing device 290 that is registered and registered is the external destination address, and the RCoA corresponding to the internal source address is Capsule as external source address (step S907), transfer to external destination address (step S908), and end. If it is confirmed that the destination address is registered in the encapsulated address list 601 in step S906, the destination address is transferred to the destination address (step S909), and the process ends.

Next, the operation of the front end processing device 290 will be described with reference to FIG.

When receiving the packet (step S1001), the front-end processing device 190 refers to the FE address 502 and confirms whether the destination address is its own address (step S502). If it is a packet addressed to itself, decapsulate it (step S1003), generate a binding list 501 that associates the internal source address (mobile terminal) with the external source address (RCoA) (step S1004), Transfer (step S1005) to finish. When it is confirmed in step S1002 that the destination address is not its own address, the nodding list 501 is searched to check whether the destination address is registered as an internal source address (step S1007). If the destination address is registered as a source address in the binding list 501, the corresponding external source address is set as the external destination address, and its own address is encapsulated as the external source address (step S1008). Transfer to MAP200 (step S1009) and end. If it is confirmed in step S1007 that the destination address is not registered in the binding list 501 as the source address, it is transferred to the destination address as it is (step S1010) and the process ends.

[0092] FIG. 16 is a diagram showing an operation when the mobile terminal 230 is registered in the user power MS together with header information centering on the edge router 240 and the front-end processing device 290. The specific operation of the embodiment will be described with reference to FIG. 12 and FIG. To do.

[0093] In FIG. 12, a broken line arrow indicates an upward direction from the mobile terminal 230 to the HSS 280, and a solid line arrow indicates a downward direction of the force from the HSS 280 to the mobile terminal 230.

[0094] (1) When the mobile terminal 230 moves to the visited network 220, it registers with the IMS in order to receive multimedia services on the visited network 220. When the mobile terminal 230 sends the register message of the mobile terminal 230 including the subscriber information and home address of the mobile terminal 230, the source address is the mobile terminal 230, and the destination address is P—CSCF server 260, the Register message Received by edge router 240 under 230. The edge router 240 confirms the destination address of the received Register message and confirms whether it is in the encapsulated address list. In this case, since the destination is the P-CSCF server 260 and is registered in the encapsulated address list, the front-end processing device 290 associated with the destination address is set as the external destination address and the internal source address. Encapsulation is performed using the RCoA of the mobile terminal 230 as an external source address, and is transferred to the front-end processing device 290.

(2) When the front-end processing device 290 receives the packet transferred from the edge router 240, it checks the destination address. In this case, since the destination address is addressed to itself, decapsulation is performed to remove the capsule, the internal source address (mobile terminal 230) is used as the source address, and the internal destination address (P—CSCF server 260) is used as the destination address. The packet is transferred to the P—CSCF server 260. When decapsulation is performed, a binding list in which the internal transmission source address (mobile terminal 130) is associated with the external transmission source address (RCoA) is generated.

[0096] (3) P—When the CSCF server 260 receives the forwarded packet from the front-end processor 290, it registers the subscriber information and home address of the mobile terminal 30, reconstructs the Register message, and sends it. A packet with the original address as self (P—CSCF server 260) and the destination address as S CSCF server 270 is generated and transferred to S—CSCF server 270.

[0097] (4) When the S—CSCF server 270 receives the packet transferred from the P—CSCF server 260, the S—CSCF server 270 confirms the validity of the subscriber information included in the Register message via the HSS 280, and Information and P—Register the CSCF server 260 address, The source address is S—CSCF server 270 and the destination address is P—CSCF server 260 to P—CSCF server 260.

[0098] (5) P—CSCF server 260 uses the destination address of the received packet as the home address of mobile terminal 230 contained in the Register message, and sets the source address as its own (P—CSC F server 260). Transfer to processor 290. The transfer operation to the front-end processing device 290 here is uniquely performed regardless of the destination address.

[0099] (6) When the front-end processing device 290 receives the packet transferred from the P—CSCF server 160, it checks the destination address. In this case, since the destination address is addressed to the mobile terminal 230 that is not addressed to itself, the RCoA registered as the external source address corresponding to the mobile terminal 230 of the internal source address is referred to by referring to the nodding list. The external destination address is encapsulated as the self (front-end processing unit 290) external source address and transferred to the MAP 200. The transfer operation to MAP200 here is performed by the destination address RCoA.

(7) When the MAP 200 receives the packet transferred from the front-end processing device 290, it transfers the packet to the edge router 240. In this forwarding operation, the encapsulation is duplicated with the LCoA corresponding to the RCoA that is the external destination address of the received packet as the external destination address of the forward packet and the self (MAP) address as the external source address of the forward packet. Forward as a packet The transfer operation to the edge router 240 here is performed by the destination address LCoA.

[0101] (8) When the edge router 240 receives the packet transferred from the MAP 200, the edge router 240 checks the destination address. In this case, since the destination address powers are SLCoA and RCoA, decapsulation that removes the power psalization is performed twice and transferred to the mobile terminal 230.

[0102] In the present embodiment configured as described above, since the downlink communication power SLCoA transferred by the MAP 200 is used, the mobile router moves and the edge router under the control of the mobile terminal is changed. However, it is sent to the edge router under the control of the mobile terminal.

[0103] Third Example

Next, a third embodiment of the present invention will be described. FIG. 17 is a block diagram showing the configuration of the third embodiment of the packet transfer system configured according to the present invention.

In this embodiment, the function of the front-end processing device 190 in the first embodiment shown in FIG. 4 is inserted into the P-CSCF server 160 to form a P-CSCF server 1160. Since the other configuration is the same as that of the embodiment shown in FIG. 4, the same reference numerals as those in FIG.

FIG. 18 is a block diagram showing a main configuration of P-CSCF server 1160 in FIG. As shown in FIG. 18, the P—CSCF server 1160 has an information storage unit 700 that stores the binding list 701 and its own address P—CSCF address 702, a list registration processing unit 703, and a semi-U connection. It consists of a U control 704, an interface 705, a P-CSCF processing unit 706, a force processing unit 707, a decapsulation processing unit 708, and a routing processing unit 709.

Judgment control section 704 refers to the stored contents of information storage section 700 for the packets transmitted / received via interface section 705, and controls the processing contents performed by each of the above sections according to the result. The list registration processing unit 703 performs registration processing in the information storage unit 700 under the control of the judgment control unit 704, and the capsule processing unit 706 and the decapsulation processing unit 707 perform capsule processing according to the control of the judgment control unit 704. The trapping process and the decapsulation process are respectively performed! /, And the processed packet is transmitted to the outside via the routing processing unit 709 and the interface unit 705. Further, the P-CSCF server is processed by the P-CSCF processing unit 706.

FIG. 19 is a diagram illustrating an operation when registering the mobile terminal 130 in the user power MS together with header information centering on the edge router 140. In the case of this embodiment, the edge router 140 does not need to manage the external destination address of the capsule address list. For packets from the mobile terminal 130 to the P—CSCF server 1160, as shown in FIG. 19, the external source address is the self (edge router) address, and the P—CSCF server address is used for the external destination address. Encapsulation will be performed.

[0109] Fourth Example

Next, a fourth embodiment of the present invention will be described. FIG. 20 is a block diagram showing the configuration of the fourth embodiment of the packet transfer system according to the present invention, and FIG. 21 shows the operation when registering the mobile terminal 230 to the user power MS, It is a figure shown with header information centering on the edge router 240, and below, the specific operation | movement of a present Example is demonstrated with reference to FIG. 20 and FIG.

In this embodiment, the function of the front-end processing device 290 in the second embodiment shown in FIG. 12 is threaded into the P-CSCF Sano 260 to form a P-CSCF server 1260. Other configurations are the same as those in the embodiment shown in FIG. 12, and therefore, the same numbers as those in FIG. The configuration of the P-CSCF server 1260 is the same as that of the P-CSCF server 1160 in the third embodiment shown in FIG.

Also in this embodiment, the edge router 240 does not need to manage the external destination address in the capsule address list as in the third embodiment. For packets from mobile terminal 230 to P—CSCF server 1260, as shown in Figure 21, the external source address is RCo A, and the external destination address is the address of P-CSCF server 1260. Will be performed capsules.

[0113] δth column

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

FIG. 22 is a block diagram showing the configuration of the fifth embodiment of the packet transfer system configured according to the present invention.

In this embodiment, the function of the edge router 140 in the first embodiment shown in FIG. 4 is incorporated in the mobile terminal 130 to form a mobile terminal 1130. Since the other configuration is the same as that of the embodiment shown in FIG. 4, the same reference numerals as those in FIG.

FIG. 23 is a block diagram showing a main configuration of the mobile terminal 1130 in the present embodiment.

[0117] As shown in Fig. 23, the mobile terminal 1130 includes an encapsulated address list 801, an information storage unit 800 that stores a binding cache 802 that manages its own HoA and CoA, a MIP control processing unit 803, and a decision control A unit 804, an interface unit 805, an application processing unit 806, an encapsulation processing unit 807, a decapsulation processing unit 808, and a routing processing unit 809 are included.

[0118] The determination control unit 804 transmits and receives packets transmitted and received via the interface unit 805. The content stored in the information storage unit 800 is referred to, and the processing content performed by each of the above units is controlled according to the result. The encapsulation processing unit 807 and the decapsulation processing unit 808 perform the capsule processing and the decapsulation processing according to the control of the judgment control unit 804, respectively, and routing the processed packets to the outside is routed. This is performed via the processing unit 80 9 and the interface unit 805. The MIP control processing unit 803 performs processing necessary for MIP control, such as a location registration request to the home agent and a change in the contents stored in the binding cache 802. The application processing unit 806 processes an operation as a mobile terminal such as displaying an application in accordance with the control of the determination control unit 804.

[0119] Fig. 24 is a diagram showing the operation when registering the mobile terminal 1130 in the user power MS together with the header information centering on the mobile terminal 1130. In the case of this embodiment, the mobile terminal 1130 When the 1130 transmits a packet to the front-end processing device, as shown in FIG. 24, the external source address is the CoA of the mobile terminal 1130, and the external destination address is the capsule using the address of the front-end processing device 190. Will be performed.

[0120] Sixth ¾ example

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

FIG. 25 is a block diagram showing the configuration of the sixth embodiment of the packet transfer system configured according to the present invention.

In this embodiment, the function of the edge router 240 in the second embodiment shown in FIG. 12 is incorporated in the mobile terminal 230 to form a mobile terminal 1230. Other configurations are the same as those of the embodiment shown in FIG. 12, and therefore, the same numbers as those in FIG.

FIG. 26 is a block diagram showing a main configuration of the mobile terminal 1230 in the present embodiment.

[0124] As shown in Fig. 23, the mobile terminal 1230 includes an encapsulated address list 1401, an information storage unit 1400 for storing a binding cache 1402 for managing all of its own HoA, RCoA, and LCoA, and an HMIP control processing unit. 1403, a judgment control unit 1404, an interface unit 1405, an application processing unit 1406, an encapsulation processing unit 1407, a decapsulation processing unit 1408, and a routing processing unit 1409 are configured.

[0125] Judgment control unit 1404 transmits and receives packets via interface unit 1405. Then, the contents stored in the information storage unit 1400 are referred to, and the processing contents performed by each of the above units are controlled according to the result. The encapsulation processing unit 1407 and the decapsulation processing unit 1408 perform the capsule processing and the decapsulation processing according to the control of the judgment control unit 1404, respectively, and send out the processed packets and the like to the outside. This is performed via 1409 and the interface unit 1405. The HMIP control processing unit 14 03 performs processing necessary for HMIP control, such as changing the contents stored in the binding cache 1402. The application processing unit 1406 processes an operation as a mobile terminal such as displaying an application according to the control of the determination control unit 1404.

FIG. 27 is a diagram showing an operation when the mobile terminal 1230 is registered in the user power MS together with the header information with the mobile terminal 1230 as the center.

In the case of this embodiment, when the mobile terminal 1230 transmits a packet to the front-end processing device 290, as shown in FIG. 13F, the external source address is the RCoA of the mobile terminal 1230 and the external destination address For this, the capsule using the address of the front-end processor 190 is performed.

[0128] 7th fine

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

FIG. 28 is a block diagram showing the configuration of the seventh embodiment of the packet transfer system configured according to the present invention.

In this embodiment, the function of the front end processing device 290 in the second embodiment shown in FIG. 12 is incorporated into the MAP 200 to form a MAP 1200. Other configurations are the same as those of the embodiment shown in FIG. 12, and therefore, the same numbers as those in FIG.

[0131] FIG. 29 is a block diagram showing a main configuration of the MAP 1200 in the present embodiment.

[0132] As shown in FIG. 29, the MAP 1200 has a binding list 1501 and a MAP address 1502 that is its own address, a mobile end, and an information storage unit 1500 that stores a binding cache 1503 that manages RCoA and LCoA of t230, A control processing unit 1504, a judgment control unit 1505, an interface unit 1506, a force processing unit 1507, a decapsulation processing unit 1508, and a routing processing unit 1509 are also configured.

[0133] The judgment control unit 1505 handles packets transmitted / received via the interface unit 1506. The content stored in the information storage unit 1500 is referred to, and the processing content performed by each of the above units is controlled according to the result. The encapsulation processing unit 1507 and the decapsulation processing unit 1508 perform the capsule processing and the decapsulation processing according to the control of the judgment control unit 1505, respectively, and send out the processed packets to the outside. This is performed via the 1509 and the interface unit 1506. The HMIP control processing unit 15 04 performs processing necessary for HMIP control, such as changing the contents stored in the binding cache 1503.

FIG. 30 is a diagram illustrating an operation when registering the mobile terminal 230 in the user power MS together with header information with the edge router 240 as the center.

In the case of this embodiment, when the edge router 240 transmits a packet to the server P—CSCF 260 registered at the internal destination address in the encapsulated address list, as shown in FIG. 13J, the external source The address is RCoA, and the external destination address is encapsulated using the MAP 1200 address.

[0136] Eighth ¾ Example

Next, an eighth embodiment of the present invention will be described.

FIG. 31 is a block diagram showing the configuration of the eighth embodiment of the packet transfer system configured according to the present invention. FIG. 32 shows the operation when registering the mobile terminal 2230 in the user power MS. It is a figure shown with header information centering on the mobile terminal 2230 and the MAP 2200. The specific operation of the present embodiment will be described below with reference to FIG. 31 and FIG.

In this embodiment, the function of the edge router 240 in the second embodiment shown in FIG. 12 is incorporated into the mobile terminal 230 to form the mobile terminal 2230, and the function of the front-end processing device 290 is incorporated into the MAP 200. It is what. Other configurations are the same as those of the embodiment shown in FIG. 12, and therefore, the same numbers as those in FIG. The configuration of mobile terminal 2230 is the same as that of mobile terminal 1230 shown in FIG. 26, and the configuration of MAP 2200 is the same as that of MAP 1200 shown in FIG.

In the case of the present embodiment, when the mobile terminal 2230 transmits a packet to the server P—CSCF 260 registered at the internal destination address in the capsule address list, as shown in FIG. The external source address is RCoA, and the external destination address is encapsulated using the MAP2200 address.

[0140] By performing packet transfer as described in the above embodiments, it is possible to shorten the communication path. In any of the above-described embodiments, the present invention may be applied to an access system to a server that exists in a regional network described as a system for receiving an IMS service. In this case as well, all the above embodiments can be applied.

[0141] In addition, the MAP, edge router and front-end processing device, and P-CSCF server are configured by a general computer system including input devices, output devices, storage devices, and control devices. The invention includes a program for causing a computer system to execute the operations performed by the MAP, edge router and front-end processing device, P-CSCF server described in each embodiment, and a recording medium for storing the program. Including.

Claims

The scope of the claims

[1] A packet forwarding system that forwards a packet sent from a mobile terminal to a server and returns it.

When the front-end processing device receives the encapsulated packet addressed to itself, the front-end processing device removes the capsule and transfers the packet based on the internal source address and the internal destination address to the internal destination address, as well as the internal source address and the external source. A binding list in which addresses are associated is generated, and when a packet whose destination address is the address of the mobile terminal is received, the binding list is referred to and described as an external destination address corresponding to the address of the mobile terminal. A packet transfer system comprising: encapsulating an address of the edge router as an external destination address and encapsulating an external source address as its own address and transferring it to the edge router.

[2] An edge router that constitutes a packet transfer system that forwards and returns a packet transmitted from a mobile terminal to a server together with a front-end processing device that exists between communication paths between the mobile terminal and the server. And

An information storage for storing a memory address list and its own address in which the address of the server is described as an internal destination address and the address of the front-end processing device corresponding to the address of the server is described as an external destination address And An encapsulation processor that performs packet encapsulation;

A decapsulation processing unit for decapsulating the packet;

When the mobile terminal power accepts a packet transmitted to the server, the address of the front-end processing device described with reference to the address of the server is referred to the external destination address with reference to the address list of the server. When the capsule processing is performed by the capsule processing unit using the self address as an external transmission source address and transferred to the front-end processing unit, and the capsule packet addressed to itself is received, the decapsulation processing unit An edge router characterized by comprising: a determination control unit that performs decapsulation and forwards a packet with an internal source address and an internal destination address to the internal destination address.

[3] A front-end processing device that constitutes a packet forwarding system that forwards packets sent from a mobile terminal to a server and returns them together with an edge router that exists between communication paths between the mobile terminal and the server. And

An information storage unit for storing a nodding list in which an internal source address and an external source address are associated with each other, and its own address;

An encapsulation processor that performs packet encapsulation;

A decapsulation processing unit for decapsulating the packet;

Upon receiving the encapsulated packet addressed to itself, the decapsulation processing unit performs decapsulation processing to remove force encapsulation, and forwards the packet with the internal source address and the internal destination address to the internal destination address. An internal source address and an external source address are registered in association with the nodding list, and when a packet whose destination address is the address of the mobile terminal is received, the binding list is referred to and the address of the mobile terminal is The edge router address described as an external destination address is used as the external destination address, and the process of encapsulating the external source address as its own address is performed by the capsule processor and transferred to the edge router. A judgment control unit. Front-end processing apparatus for.

[4] A packet transfer system for transferring a packet transmitted from a mobile terminal to a server and returning the packet. An edge router existing between communication paths between the mobile terminal and the server, the edge router having a power address list in which an address of the server is described as an internal destination address; When a packet sent to the server is received, the capsule address list is referenced, the server address is set as the external destination address, and the own address is encapsulated as the external source address and transferred to the server. When the encapsulated packet addressed to itself is received, the capsule is removed, and the packet with the internal source address and internal destination address is transferred to the internal destination address.

When the server receives the encapsulated packet addressed to itself, it removes the capsule and forwards the packet with the internal source address and the internal destination address to the internal destination address, and at the same time, compares the internal source address and the external source address. An associated binding list is generated, and when the packet whose destination address is the address of the mobile terminal is transmitted, the binding list is referred to and described as an external destination address corresponding to the address of the mobile terminal. A packet forwarding system, wherein the edge router address as an external destination address and an external source address as an own address are encapsulated and forwarded to the edge router.

An edge router existing between communication paths between the mobile terminal and the server that constitutes a packet transfer system for transferring a packet transmitted from the mobile terminal to a server, and the address of the server is described as an internal destination address An information storage unit for storing the registered capsule address list and its own address;

An encapsulation processor that performs packet encapsulation;

A decapsulation processing unit for decapsulating the packet;

Upon receiving a packet transmitted to the server, the mobile terminal power refers to the cab cell address list, encapsulates the server address as an external destination address and its own address as an external source address. When the encapsulated processing unit transfers the packet to the server and receives the encapsulated packet addressed to itself, the decapsulating processing unit performs decapsulation, and the packet based on the internal source address and the internal destination address is received. A decision control unit for forwarding to the internal destination address. And edge router.

[6] A server that receives packets transmitted by the mobile terminal via the edge router, and stores a binding list in which an internal source address and an external source address are associated with each other and its own address. When,

An encapsulation processor that performs packet encapsulation;

A decapsulation processing unit for decapsulating the packet;

Upon receiving the encapsulated packet addressed to itself, the decapsulation processing unit performs decapsulation processing to remove force encapsulation, and forwards the packet with the internal source address and the internal destination address to the internal destination address. An internal source address and an external source address are registered in association with the nodding list, and the address of the mobile terminal is referred to when the packet whose destination address is the address of the mobile terminal is transmitted. The edge router address is described as an external destination address, and the capsule processor is configured to perform the process of encapsulating the external source address as its own address. And a judgment control unit for transferring to the data. Over server.

[7] A packet transfer system for transferring a packet transmitted from a mobile terminal to a server and returning the packet.

The edge router includes a capsule address list in which an address of the server is described as an internal destination address, and an address of the front end processing device corresponding to the address of the server is described as an external destination address. The terminal manages RCoA, which is a CoA created in the subnet held by the MAP, and LCoA, which is a CoA created in the subnet held by the edge router, corresponding to the home address, and When the packet transmitted to the server is received, the capsule terminal address list is referred to, the address of the front-end processing device described in correspondence with the address of the server is set as an external destination address, and the mobile terminal RCoA is encapsulated as an external source address and To front-end processing equipment Forwards, receives the encapsulated packet destined for RCoA or LCoA, removes the encapsulation, forwards the packet with the internal source address and internal destination address to the internal destination address,

An edge router configured to transfer a packet transmitted from a mobile terminal to a server and return a packet transfer system together with a front-end processing device and a MAP existing between communication paths between the mobile terminal and the server,

The server address is described as an internal destination address, the address of the front end processing device corresponding to the server address is described as an external destination address, and the mobile terminal address list. A binding cache that manages RCoA, which is a CoA created in the subnet held by the MAP, and an LCoA, which is a CoA created in the subnet held by the edge router, corresponding to the home address, and stores its own address An information storage unit to

An encapsulation processor that performs packet encapsulation;

A decapsulation processing unit for decapsulating the packet;

When the mobile terminal power receives a packet transmitted to the server, Referring to the cell address list and the binding cache, the address of the front-end processing device described corresponding to the address of the server is set as the external destination address, and the RCoA of the mobile terminal is encapsulated as the external source address Processing is performed by the encapsulation processing unit and transferred to the front-end processing unit. When a capsuled packet addressed to RCoA or LCoA is received, decapsulation processing is performed to remove the capsule from the decapsulation processing unit. An edge router comprising: a determination control unit configured to transfer a packet having an internal source address and an internal destination address to the internal destination address.

[9] A front-end processing device configured to transfer a packet transmitted from a mobile terminal to a server and return the packet transfer system together with an edge router and a map existing between communication paths between the mobile terminal and the server Because

An encapsulation processor that performs packet encapsulation;

A decapsulation processing unit for decapsulating the packet;

Upon receiving the encapsulated packet addressed to itself, the decapsulation processing unit performs decapsulation processing to remove force encapsulation, and forwards the packet with the internal source address and the internal destination address to the internal destination address. An internal source address and an external source address are registered in association with the nodding list, and when a packet whose destination address is the address of the mobile terminal is received, the binding list is referred to and the address of the mobile terminal is Described as an external destination address, the RCoA of the mobile terminal is set as the external destination address, and the process of encapsulating the external source address as its own address is performed by the encapsulation processing unit and transferred to the MAP. And a determination control unit. Apparatus.

[10] A MAP configured to transfer a packet transmitted from a mobile terminal to a server and return a packet transfer system together with an edge router and a front-end processing device existing between communication paths between the mobile terminal and the server. And

A binding cache that automatically manages RCoA and LCoA of the mobile terminal An information storage unit for storing one's address;

An encapsulation processor that performs packet encapsulation;

When an RCoA packet whose destination address is managed in the binding cache is received, the LCoA corresponding to the RCoA that is the destination address of the received packet is set as the external destination address, and the own address is encapsulated as the external source address A decision control unit that causes the encapsulation processing unit to perform transfer to the edge router.

A packet transfer system for transferring a packet transmitted from a mobile terminal to a server and returning the packet.

When the server receives the encapsulated packet addressed to itself, it removes the capsule and forwards the packet with the internal source address and the internal destination address to the internal destination address, and at the same time, compares the internal source address and the external source address. An associated binding list is generated, and when the packet whose destination address is the address of the mobile terminal is transmitted, the binding list is referred to and described as an external destination address corresponding to the address of the mobile terminal. The RCoA of the mobile terminal is used as an external destination address, the external source address is encapsulated as its own address and transferred to the MAP. The MAP manages the RCoA and LCoA of the mobile terminal correspondingly, and Address When an RCoA packet is received, the LCoA corresponding to the RCoA that is the destination address of the received packet is set as the external destination address, and the packet is transferred to the edge router as a packet that is encapsulated with its own address as the external source address. A feature packet forwarding system.

[12] An edge router existing between communication paths between the mobile terminal and the server that constitutes a packet transfer system for transferring a packet transmitted from the mobile terminal to a server, and having an internal destination address of the server Capsule address list in which addresses are described, and RCoA that is CoA created by the mobile terminal in the subnet held by the MAP and LCoA that is CoA created by the subnet held by the edge router A binding cache that manages and corresponding to the home address, an information storage unit that stores its own address,

An encapsulation processor that performs packet encapsulation;

A decapsulation processing unit for decapsulating the packet;

Upon receiving a packet transmitted to the server, the mobile terminal power refers to the capsule address list and the binding cache, uses the server address as an external destination address, and uses the mobile terminal RCoA as an external source address. Encapsulation processing is performed by the encapsulation processing unit and transferred to the server. When a capsuled packet addressed to RCoA or LCoA is received, the decapsulation processing unit performs decapsulation processing, and the internal transmission source An edge router comprising: a determination control unit configured to transfer a packet based on an address and an internal destination address to the internal destination address.

[13] Mobile terminal power An information storage unit that receives a transmitted packet via an edge router and stores a binding list in which an internal source address and an external source address are associated with each other and a self-address When,

An encapsulation processor that performs packet encapsulation;

A decapsulation processing unit for decapsulating the packet;

Upon receiving the encapsulated packet addressed to itself, the decapsulation processing unit performs decapsulation processing to transfer the packet based on the internal source address and the internal destination address to the internal destination address, and in the binding list. Source address and Registered in association with an external source address, and refers to the binding list when transmitting a packet whose destination address is the address of the mobile terminal, and is described as an external destination address corresponding to the address of the mobile terminal A decision control unit that encapsulates the RCoA of the mobile terminal as an external destination address and encapsulates the external source address as its own address and forwards it to the MAP. A server characterized by that.

[14] A packet transfer system for transferring a packet transmitted from a mobile terminal to a server and returning the packet.

When the front-end processing device receives the encapsulated packet addressed to itself, the front-end processing device removes the capsule and transfers the packet based on the internal source address and the internal destination address to the internal destination address, as well as the internal source address and the external source. A binding list in which addresses are associated is generated, and when a packet whose destination address is the address of the mobile terminal is received, the binding list is referred to and described as an external destination address corresponding to the address of the mobile terminal. A packet transfer system, wherein the CoA of the mobile terminal is used as an external destination address and the external source address is encapsulated as its own address and transferred to the mobile terminal.

[15] A mobile terminal that performs packet transmission to a server and a reply from the server via a front-end processing device existing between communication paths with the server,

The address of the server is described as an internal destination address, and the address of the server An information storage unit that stores a power address list in which the address of the corresponding front-end processing device is described as an external destination address and its own CoA;

An encapsulation processor that performs packet encapsulation;

A decapsulation processing unit for decapsulating the packet;

When transmitting to the server, the capsule address list is referred to, the address of the front-end processing device described corresponding to the server address is set as the external destination address, and its own CoA is set. Processing to encapsulate as an external source address is performed by the capsule processing unit and transferred to the front-end processing unit. When a capsuled packet addressed to its own CoA is received, it is encapsulated in the decapsulation processing unit. And a determination control unit for performing decapsulation processing for removing the mobile terminal.

The mobile terminal includes a capsule address list in which an address of the server is described as an internal destination address, and an address of the front-end processing device corresponding to the server address is described as an external destination address. When RCoA, which is a CoA created in the subnet held by the MAP, and LCoA, which is a CoA created in the subnet in which the service is located, are managed according to the home address and sent to the server Referring to the capsule address list, the address of the front-end processing device described corresponding to the address of the server is set as the external destination address, and the RCoA of the mobile terminal is encapsulated as the external source address. Forward to the front-end processing unit and encapsulate for RCoA or LCoA Remove the Kapuserui spoon was when received to signal the packet,

When the front-end processing device receives the encapsulated packet addressed to itself, the front-end processing device removes the capsule and transfers the packet based on the internal source address and the internal destination address to the internal destination address, as well as the internal source address and the external source. Address and correspondence A binding list is generated, and when a packet whose destination address is the address of the mobile terminal is received, the binding list is referred to and the mobile terminal's address described in the mobile terminal described as the external destination address corresponding to the address of the mobile terminal Encapsulate RCoA as an external destination address, external source address as its own address, and transfer to MAP,

[17] A mobile terminal that performs packet transmission to a server and a reply from the server via a front-end processing device and a MAP that exist between communication paths with the server, and the address of the server as an internal destination address RCoA, which is a CoA created in the subnet that the MAP holds for the self-addressed address list in which the address of the front-end processing device corresponding to the address of the server is described as an external destination address And an information storage unit that stores a binding cache that manages LCoA that is a CoA created in a subnet that is located in correspondence with a home address, an encapsulation processing unit that performs packet encapsulation,

A decapsulation processing unit for decapsulating the packet;

When transmitting to the server, referring to the capsule address list, the address of the front-end processing device described corresponding to the server address is set as the external destination address, and the mobile terminal Processing to encapsulate RCoA as an external source address is performed by the encapsulation processing unit, forwarded to the front-end processing device, and receives the encapsulated packet addressed to RCoA or LCoA. A determination control unit that causes the unit to perform decapsulation processing for removing the capsule.

[18] A packet transfer system for transferring a packet transmitted from a mobile terminal to a server and returning the packet. An edge router and a MAP existing between communication paths between the mobile terminal and the server,

When the MAP manages the RCoA and LCoA of the mobile terminal in correspondence with each other and receives a force-packeted packet addressed to itself, the MAP removes the capsule and internally transmits the packet based on the internal source address and the internal destination address. A forwarding list is generated and a nodding list in which an internal source address is associated with an external source address is generated. When a packet whose destination address is the address of the mobile terminal is received, the binding list is referred to. It is described as an external destination address corresponding to the address of the mobile terminal, and is transferred as a packet encapsulated with the RCoA of the mobile terminal as an external destination address and its own address as an external source address. When an RCoA packet is received, the RCoA that is the destination address of the received packet The response to LCoA and external destination address, the packet transfer system, characterized in that as a Kapuserui spoon packet its own address as the external source address to forward to the edge router.

A packet transfer system for transferring a packet transmitted from a mobile terminal to a server and returning the packet, together with a MAP existing between communication paths between the mobile terminal and the server, an edge router,

The address of the server is described as an internal destination address, and the address of the server The capsule address list in which the corresponding MAP address is described as an external destination address, and the RCoA, which is a CoA created by the subnet held by the MAP by the mobile terminal, and the subnet held by the edge router Information to store the nodding cache that manages the created CoA, LCo A, corresponding to the home address

§ Shi 'I thought ρβ,

An encapsulation processor that performs packet encapsulation;

A decapsulation processing unit for decapsulating the packet;

The MAP address is used as an external destination address and the RCoA of the mobile terminal is encapsulated as an external source address. The capsule processing unit performs the process of encapsulating the address and transferring it to the MAP. A decision control unit that causes the decapsulation processing unit to perform decapsulation processing to remove the capsule when the received packet is received and forwards the packet based on the internal source address and the internal destination address to the internal destination address. A featured edge router.

A MAP comprising a packet transfer system for transferring a packet transmitted from a mobile terminal to a server and returning it together with an edge router existing between communication paths between the mobile terminal and the server,

An encapsulation processor that performs packet encapsulation;

A decapsulation processing unit for decapsulating the packet;

When the encapsulated packet addressed to itself is received, the decapsulation processing unit performs decapsulation processing to remove the power and transfers the packet with the internal source address and the internal destination address to the internal destination address. A source address and an external source address are registered in the binding list, and when a packet whose destination address is the address of the mobile terminal is received, the binding list is referred to, and the mobile Transfer by encapsulating the RCoA of the mobile terminal described as the external destination address corresponding to the address of the terminal as the external destination address and the self address as the external source address to the capsule processing unit When the packet having the destination address RCoA is received, the encapsulation process is performed by encapsulating the LCoA corresponding to the RCoA that is the destination address of the received packet as the external destination address and the self address as the external source address. And a decision control unit that causes the unit to perform forwarding to the edge router.

A packet transfer system composed of a mobile terminal and a MAP,

When the MAP manages the RCoA and LCoA of the mobile terminal in correspondence with each other and receives a force-packeted packet addressed to itself, the MAP removes the capsule and internally transmits the packet based on the internal source address and the internal destination address. A forwarding list is generated and a nodding list in which an internal source address is associated with an external source address is generated. When a packet whose destination address is the address of the mobile terminal is received, the binding list is referred to. It is described as an external destination address corresponding to the address of the mobile terminal, and is transferred as a packet encapsulated with the RCoA of the mobile terminal as an external destination address and its own address as an external source address. When an RCoA packet is received, the RCoA that is the destination address of the received packet The response to LCoA and external destination address, the packet transfer system, characterized in that as a Kapuserui spoon packet its own address as the external source address to forward to the edge router. [22] A mobile terminal that performs packet transmission to a server and a reply from the server via a MAP that exists between communication paths with the server,

An encapsulation processor that performs packet encapsulation;

A decapsulation processing unit for decapsulating the packet;

In the case of transmission to the server, the capsule address list is referred to, the MAP address described corresponding to the server address is set as the external destination address, and the RCoA of the mobile terminal is set. Decapsulation that decapsulates to the decapsulation processing unit when the encapsulation processing unit performs the process of encapsulating as an external source address, forwards it to the MAP, and receives the encapsulated packet addressed to RCoA or LCoA A mobile terminal comprising: a judgment control unit that performs a digitization process.

[23] A packet transfer method performed in a packet transfer system in which an edge router and a front-end processing device exist between communication paths between a mobile terminal and a server,

The edge router includes a capsule address list in which an address of the server is described as an internal destination address, and an address of the front-end processing device corresponding to the address of the server is described as an external destination address. When the packet transmitted from the server to the server is received, the capsule address list is referred to, the address of the front-end processing device described corresponding to the server address is set as the external destination address, The address is encapsulated as an external source address and transferred to the front-end processing unit. When a self-encapsulated packet is received, the capsule is removed, and the packet with the internal source address and internal destination address is received. Process to transfer to the destination address Such ヽ,

When the front-end processing device receives the encapsulated packet addressed to itself, Removes the capsule, forwards the packet with the internal source address and the internal destination address to the internal destination address, generates a binding list in which the internal source address and the external source address are associated, and the destination address is the mobile terminal. When the packet is received, the binding list is referred to, the address of the edge router described as the external destination address corresponding to the address of the mobile terminal is set as the external destination address, and the external source address is set as the external destination address. A packet transfer method comprising: encapsulating as a self address and transferring the packet to the edge router.

[24] A packet transfer system for transferring a packet transmitted from a mobile terminal to a server and returning the packet is performed by an edge router configured with a front-end processing device existing between communication paths between the mobile terminal and the server. A packet transfer method,

The server address is described as an internal destination address, and the address of the front-end processing device corresponding to the server address is provided as an external destination address. When a packet transmitted to the server is received, the capsule address list is referred to, the address of the front-end processing device described in correspondence with the server address is set as the external destination address, and its own address is set as the external address. Encapsulated as a source address, forwarded to the front-end processing unit. When a self-encapsulated packet is received, the capsule is removed and a packet based on the internal source address and the internal destination address is transferred to the internal destination address. Packet transfer characterized by forwarding Method.

[25] A packet transfer system that forwards and returns a packet transmitted from a mobile terminal to a server is performed by a front-end processing device configured with an edge router existing between communication paths between the mobile terminal and the server. A packet transfer method,

When the encapsulated packet addressed to itself is received, the capsule is removed and the packet with the internal source address and internal destination address is transferred to the internal destination address, and the internal source address and external source address are associated with each other. A nodding list is generated, and when a packet whose destination address is the address of the mobile terminal is received, the binding list is referred to and described as an external destination address corresponding to the address of the mobile terminal! / Use the edge router address as the external destination address and the external source address A packet transfer method, wherein the packet is encapsulated as a self-address and transferred to the edge router.

[26] A packet transfer method performed in a packet transfer system in which an edge router exists between communication paths between a mobile terminal and a server,

The edge router includes a force address list in which the address of the server is described as an internal destination address. When receiving a packet transmitted from the mobile terminal to the server, the edge router refers to the capsule address list. The address of the server is set as the external destination address, and the self address is encapsulated as the external source address and transferred to the server. When the encapsulated packet addressed to the self is received, the capsule is removed, and the internal address Performs processing to forward packets from the source address and internal destination address to the internal destination address,

When the server receives the encapsulated packet addressed to itself, it removes the capsule and forwards the packet with the internal source address and the internal destination address to the internal destination address, and at the same time, compares the internal source address and the external source address. An associated binding list is generated, and when the packet whose destination address is the address of the mobile terminal is transmitted, the binding list is referred to and described as an external destination address corresponding to the address of the mobile terminal. A packet transfer method comprising: encapsulating an address of the edge router as an external destination address and encapsulating an external source address as its own address and transferring the result to the edge router.

[27] A packet transfer method performed by an edge router existing between communication paths between the mobile terminal and the server, which constitutes a packet transfer system for transferring a packet transmitted from the mobile terminal to a server,

A capsule address list in which the server address is described as an internal destination address is provided. When a packet transmitted to the server is received, the capsule address list is referred to when the packet sent to the server is received. The external destination address is encapsulated as the external source address and transferred to the server. When the encapsulated packet is received, the capsule is removed and the internal source address and internal destination address are received. Forwards packets to the internal destination address Packet transfer method.

[28] Mobile terminal power A packet transfer method performed by a server that receives a transmitted packet via an edge router,

When the encapsulated packet addressed to itself is received, the capsule is removed and the packet with the internal source address and internal destination address is transferred to the internal destination address, and the internal source address and external source address are associated with each other. The edge that is described as an external destination address corresponding to the address of the mobile terminal by generating a nodding list and referring to the binding list when transmitting a packet whose destination address is the address of the mobile terminal A packet transfer method comprising encapsulating a router address as an external destination address and encapsulating an external source address as its own address and transferring it to the edge router.

[29] A packet transfer method performed in a packet transfer system in which an edge router, a front-end processing device, and a MAP exist between communication paths between a mobile terminal and a server, wherein the edge router uses the server as an internal destination address The address of the front-end processing device corresponding to the address of the server is provided with a capsule address list in which the address of the front-end processing device is described as an external destination address, and the mobile terminal is created in the subnet held by the MAP. RCoA, which is a registered CoA, and LCoA, which is a CoA created in the subnet held by the edge router, are managed in correspondence with the home address, and the mobile terminal power accepts packets transmitted to the server And the address of the server with reference to the capsule address list The address of the front-end processing device described in the above is used as an external destination address, and the RCoA of the mobile terminal is encapsulated as an external source address and transferred to the front-end processing device, and is sent to the RCoA or LCoA When the encapsulated packet is received, it is decapsulated and the packet with the internal source address and internal destination address is transferred to the internal destination address.

When the front-end processing device receives the encapsulated packet addressed to itself, the front-end processing device removes the capsule and transfers the packet based on the internal source address and the internal destination address to the internal destination address, as well as the internal source address and the external source. Address and correspondence A binding list is generated, and when a packet whose destination address is the address of the mobile terminal is received, the binding list is referred to and the mobile terminal's address described in the mobile terminal described as the external destination address corresponding to the address of the mobile terminal Encapsulate RCoA as the external destination address and the external source address as its own address and transfer it to the MAP.

The MAP manages the RCoA and LCoA of the mobile terminal in association with each other. When a packet having a destination address of RCoA is received, the LCoA corresponding to the RCoA that is the destination address of the received packet is set as the external destination address, and its own address A packet transfer method characterized by performing a process of transferring a packet encapsulated as an external source address to the edge router.

[30] An edge router comprising a packet transfer system that forwards and returns a packet transmitted from a mobile terminal together with a front-end processing device and a MAP existing between communication paths between the mobile terminal and the server A packet forwarding method performed in the above described method, wherein the address of the server is described as an internal destination address, and the address of the front-end processing device corresponding to the address of the server is described as an external destination address. The RCoA, which is a CoA created in the subnet held by the MAP, and the LCoA, which is a CoA created in the subnet held by the edge router, are associated with the home address for the mobile terminal. Managing and accepting packets sent to the mobile terminal power server The address of the front-end processing device described with reference to the capsule address list is described as an external destination address, and the RCoA of the mobile terminal is encapsulated as an external source address. Transfer to the front-end processing unit, receive the encapsulated packet addressed to RCoA or LCoA, remove the capsule, and transfer the packet based on the internal source address and internal destination address to the internal destination address. Packet transfer method

[31] A packet transfer system for transferring a packet transmitted from a mobile terminal to a server and sending it back is designated as an edge router and an M that exist between communication paths between the mobile terminal and the server. A packet transfer method performed by a front-end processing device configured with an AP.

When the encapsulated packet addressed to itself is received, the capsule is removed and the packet with the internal source address and internal destination address is transferred to the internal destination address, and the internal source address and external source address are associated with each other. A nodding list is generated, and when a packet whose destination address is the address of the mobile terminal is received, the binding list is referred to and described as an external destination address corresponding to the address of the mobile terminal. A packet transfer method comprising: encapsulating an RCoA of a mobile terminal as an external destination address and encapsulating an external source address as its own address and transferring the packet to the MAP.

[32] A MAP comprising a packet transfer system for transferring a packet transmitted from a mobile terminal to a server and returning the packet together with an edge router and a front-end processing device existing between communication paths between the mobile terminal and the server. A packet transfer method performed by managing the RCoA and LCoA of the mobile terminal in association with each other, and receiving a packet with a destination address of RCoA, an LCoA corresponding to the RCoA that is the destination address of the received packet. A packet transfer method comprising transferring an external destination address to the edge router as a packet encapsulated with its own address as an external source address.

[33] A packet forwarding method performed in a packet forwarding system in which an edge router and a MAP exist between communication paths between a mobile terminal and a server,

The edge router has a force address list in which the address of the server is described as an internal destination address, and the RCoA that is a CoA created by the subnet held by the MAP for the mobile terminal. The LCoA, which is a CoA created in the subnet held by the edge router, is managed in correspondence with the home address, and when the packet transmitted from the mobile terminal to the server is received, the capsule address list is updated. The address of the server is set as the external destination address, the RCoA of the mobile terminal is encapsulated as the external source address, transferred to the server, and the encapsulated packet addressed to RCoA or LCoA is received. Remove the trap and forward the packet with the internal source address and internal destination address to the internal destination address Process When the server receives the encapsulated packet addressed to itself, it removes the capsule and forwards the packet with the internal source address and the internal destination address to the internal destination address, and at the same time, compares the internal source address and the external source address. An associated binding list is generated, and when the packet whose destination address is the address of the mobile terminal is transmitted, the binding list is referred to and described as an external destination address corresponding to the address of the mobile terminal. The RCoA of the mobile terminal as an external destination address and the external source address as its own address are encapsulated and transferred to the MAP.

[34] A packet transfer method performed by an edge router existing between communication paths between the mobile terminal and the server, which constitutes a packet transfer system for transferring a packet transmitted from the mobile terminal to the server,

A capsule address list in which the address of the server is described as an internal destination address is provided, and the RCoA that is a CoA created in the subnet held by the MAP by the mobile terminal and the subnet held by the edge router LCoA, which is a CoA created in Step 1, is managed in correspondence with the home address, and when a packet transmitted from the mobile terminal to the server is accepted, the capsule address list is referred to and the address of the server Is the external destination address, the RCoA of the mobile terminal is encapsulated as the external source address, transferred to the server, and when an encapsulated packet destined for RCoA or LCoA is received, the capsule is removed and the internal source address is removed. And packets with the internal destination address are forwarded to the internal destination address. Transfer method.

[35] Mobile terminal power A packet transfer method performed by a server that receives a transmitted packet via an edge router,

When a capsule packet addressed to itself is received, the capsule packet is removed and internal transmission is performed. A packet with the source address and the internal destination address is transferred to the internal destination address, and a nodding list in which the internal source address and the external source address are associated with each other is generated, and a packet whose destination address is the address of the mobile terminal is generated. Refer to the binding list when transmitting, and is described as the external destination address corresponding to the address of the mobile terminal !, the RCoA of the mobile terminal as the external destination address, and the external source address as its own address. A bucket transfer method comprising encapsulating and transferring to the MAP.

[36] A packet transfer method performed in a packet transfer system in which a front-end processing device exists between communication paths between a mobile terminal and a server,

The mobile terminal includes a capsule address list in which an address of the server is described as an internal destination address, and an address of the front-end processing device corresponding to the address of the server is described as an external destination address. When referring to the capsule address list, the address of the front-end processing device described corresponding to the address of the server is set as the external destination address, and its own CoA is set as the external source address. And then forwards it to the front-end processing unit. When receiving an encapsulated packet addressed to its own CoA, it performs the decapsulation process.

When the front-end processing device receives the encapsulated packet addressed to itself, the front-end processing device removes the capsule and transfers the packet based on the internal source address and the internal destination address to the internal destination address, as well as the internal source address and the external source. A binding list in which addresses are associated is generated, and when a packet whose destination address is the address of the mobile terminal is received, the binding list is referred to and described as an external destination address corresponding to the address of the mobile terminal. A packet transfer method comprising: encapsulating an external destination address as a CoA of the mobile terminal and an external source address as its own address and transferring the packet to the mobile terminal.

[37] A packet transfer method performed at a mobile terminal that performs packet transmission to a server and reception from the server via a front-end processing device existing between communication paths with the server, The server address is described as an internal destination address, and the address of the front end processing device corresponding to the server address is provided as an external destination address, and is transmitted to the server. When referring to the capsule address list, the address of the front-end processing device described corresponding to the address of the server is set as the external destination address, and the own CoA is set as the external source address. Packet transfer method characterized in that the packet transfer method is removed when the encapsulated packet addressed to its own CoA is received and transferred to the front-end processing device, and the front-end processing is performed between the communication path between the mobile terminal and the server. Packets performed in the packet forwarding system where the device and MAP exist A delivery method,

The mobile terminal includes a capsule address list in which an address of the server is described as an internal destination address, and an address of the front-end processing device corresponding to the server address is described as an external destination address. When RCoA, which is a CoA created in the subnet held by the MAP, and LCoA, which is a CoA created in the subnet in which the service is located, are managed according to the home address and sent to the server Referring to the capsule address list, the address of the front-end processing device described corresponding to the address of the server is set as the external destination address, and the RCoA of the mobile terminal is encapsulated as the external source address. Forward to the front-end processing unit and encapsulate for RCoA or LCoA Packet row processing to remove the Upon receiving encapsulate ヽ,

When the front-end processing device receives the encapsulated packet addressed to itself, the front-end processing device removes the capsule and transfers the packet based on the internal source address and the internal destination address to the internal destination address, as well as the internal source address and the external source. A binding list in which addresses are associated is generated, and when a packet whose destination address is the address of the mobile terminal is received, the binding list is referred to and described as an external destination address corresponding to the address of the mobile terminal. The RCoA of the mobile terminal is set as the external destination address, the external source address is encapsulated as its own address, and transferred to the MAP. The MAP manages the RCoA and LCoA of the mobile terminal in association with each other. When a packet having a destination address of RCoA is received, the LCoA corresponding to the RCoA that is the destination address of the received packet is set as the external destination address, and its own address A packet transfer method characterized by performing a process of transferring a packet encapsulated as an external source address to the edge router.

[39] A packet transfer method performed in a mobile terminal that performs packet transmission to a server and a reply from the server via a front-end processing device and a MAP existing between communication paths with the server,

The server address is described as an internal destination address, and the address of the front end processing device corresponding to the server address is provided as an external destination address. When managing RCoA, which is a CoA created in the subnet to be used, and L CoA, which is a CoA created in the subnet in which it is located, corresponding to the home address and transmitting to the server, Referring to the capsule address list, the address of the front-end processing device described in correspondence with the address of the server is set as the external destination address, and the RCoA of the mobile terminal is encapsulated as the external source address. Transfer to the front-end processing unit and send the encapsulated packet addressed to RCoA or LCoA When Shin packet transfer method characterized by removing the encapsulation.

[40] A packet transfer method performed in a packet transfer system in which an edge router and a MAP exist between communication paths between a mobile terminal and a server,

The edge router includes a capsule address list in which an address of the server is described as an internal destination address, and an address of the MAP corresponding to the address of the server is described as an external destination address. The RCoA, which is a CoA created in the subnet held by the network, and the LCoA, which is a CoA created in the subnet held by the edge router, are managed according to the home address, and the mobile terminal power When the received packet is received, the encapsulated address list is referred to and described in correspondence with the address of the server! The MAP address is used as the external destination address, and the RCoA of the mobile terminal is externally transmitted. With original address And encapsulated and forwarded to the MAP. When an encapsulated packet destined for RCoA or LCoA is received, the capsule is removed and the packet with the internal source address and internal destination address is transferred to the internal destination address. ,

When the MAP manages the RCoA and LCoA of the mobile terminal in correspondence with each other and receives a force-packeted packet addressed to itself, the MAP removes the capsule and internally transmits the packet based on the internal source address and the internal destination address. A forwarding list is generated and a nodding list in which an internal source address is associated with an external source address is generated. When a packet whose destination address is the address of the mobile terminal is received, the binding list is referred to. It is described as an external destination address corresponding to the address of the mobile terminal, and is transferred as a packet encapsulated with the RCoA of the mobile terminal as an external destination address and its own address as an external source address. When an RCoA packet is received, the RCoA that is the destination address of the received packet The response to LCoA and external destination address, the packet transfer method characterized by in that the Kapuserui spoon its own address as the external source address packet performs a process of transferring to the edge router. A packet transfer method performed by an edge router that configures a packet transfer system that transfers a packet transmitted from a mobile terminal to a server and returns the packet together with a MAP existing between communication paths between the mobile terminal and the server. ,

The edge router includes a capsule address list in which an address of the server is described as an internal destination address, and an address of the MAP corresponding to the address of the server is described as an external destination address. The RCoA, which is a CoA created in the subnet held by the network, and the LCoA, which is a CoA created in the subnet held by the edge router, are managed according to the home address, and the mobile terminal power When the received packet is received, the encapsulated address list is referred to and described in correspondence with the address of the server! The MAP address is used as the external destination address, and the RCoA of the mobile terminal is externally transmitted. Encapsulated as the original address and forwarded to the MAP, encapsulated for RCoA or LCoA And when receiving a packet Remove Kapuserui spoon, a packet transfer method characterized by transferring the packet according to the internal source address and the internal destination address to an internal destination address. [42] Packet forwarding performed by a MAP comprising a packet forwarding system that forwards and returns a packet transmitted from a mobile terminal together with an edge router existing between communication paths between the mobile terminal and the server A method,

When the RCoA and LCoA of the mobile terminal are managed correspondingly and a capsuled packet addressed to itself is received, the capsule is removed and the packet with the internal source address and internal destination address is transferred to the internal destination address. A binding list in which an internal source address and an external source address are associated is generated, and when a packet whose destination address is the address of the mobile terminal is received, the binding list is referred to and the address corresponding to the address of the mobile terminal When the RCoA of the mobile terminal described as the external destination address is used as an external destination address, the packet is encapsulated with its own address as the external source address, and the packet is received when the destination address is RCoA. LCo corresponding to RCoA that is the destination address of the packet A packet transfer method comprising transferring A to an edge router as a packet encapsulated with A as an external destination address and its own address as an external source address.

[43] A packet transfer method performed in a packet transfer system composed of a mobile terminal and a MAP,

The mobile terminal is provided with a force address list in which the address of the server is described as an internal destination address, and the address of the MAP corresponding to the address of the server is described as an external destination address. When managing RCoA, which is a CoA created in the subnet to be held, and L CoA, which is a CoA created in the subnet in which it is located, corresponding to the home address and sending it to the server, Referring to the capsule address list, the address of the MAP described in correspondence with the address of the server is set as an external destination address, and the RCoA of the mobile terminal is encapsulated as an external source address to map the MAP. And when the packet encapsulated for RCoA or LCoA is received, the capsule is removed.

When the MAP manages the RCoA and LCoA of the mobile terminal in correspondence with each other and receives a force-packeted packet addressed to itself, the MAP removes the capsule and internally transmits the packet based on the internal source address and the internal destination address. Forward to destination address and internal source address A nodding list in which the address and the external source address are associated with each other, and when a packet whose destination address is the address of the mobile terminal is received, the binding list is referred to and an external destination corresponding to the address of the mobile terminal When a packet with the destination address RCoA is received as a packet encapsulated with the RCoA of the mobile terminal as the external destination address and its own address as the external source address, the received packet A packet transfer method comprising: forwarding to the edge router as a packet encapsulated with an LCoA corresponding to an RCoA that is a destination address as an external destination address and an own address as an external source address .

[44] A packet transfer method performed by a mobile terminal that transmits a packet to a server and sends a reply from the server via a MAP existing between communication paths with the server, the internal destination address of the server RCoA which is a CoA created in a subnet held by the MAP and having an address described therein, and having a capsule address list in which the address of the MAP corresponding to the address of the server is described as an external destination address And LCoA, which is a CoA created in the subnet in which it is located, corresponding to the home address, and when transmitting to the server, refer to the capsule address list and refer to the address of the server. The MAP address that is described correspondingly is the external destination address, and the RCoA of the mobile terminal is externally transmitted. Packet transfer method, characterized in that said transferred to MAP encapsulates as the address, remove the Kapuserui spoon receives the encapsulated packet addressed to RCoA addressed or LCoA.

[45] A program for causing a computer system to execute the method according to claim 24, 25, 27, 28, 30, 31, 32, 34, 35, 37, 39, 41.

[46] A recording medium storing the program according to claim 45.