JP4725751B2 - Packet transfer system and method, apparatus constituting the system, program and recording medium - Google Patents

Description

  The present invention relates to a mobile communication network, an edge router apparatus, 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).

  Previously, 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 has been studied by the IETF (Internet Engineering Task Force). Has been.

  The method described in RFC3775 “Mobility Support in IPv6” <http://www.ietf.org/rfc/rfc3775.txt> is generally called the Mobile IPv6 method. FIG. 1 shows the configuration of a mobile communication network based on Mobile IPv6. In the following description, Mobile IPv6 is abbreviated as MIPv6.

  The mobile communication network shown in FIG. 1 includes home agents 51 and 52, edge routers 53 and 54, mobile terminals 55 and 56, an IP network (router network) 200, and home networks 301 and 302.

  Each of the mobile terminals 55 and 56 has home addresses (HoA) “HoA1” and “HoA2” of the home networks 301 and 302 as IP addresses.

  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 the own terminal, the home addresses “HoA1” and “HoA2” are set as destination addresses ( Destination Address) and source address (Source Address) are used for data communication by a normal IP protocol.

  Next, a case where the mobile terminals 55 and 56 communicate when the mobile terminals 55 and 56 move from their home networks 301 and 302 will be described. Assume that the mobile terminal 55 has moved under the edge router 53 constituting the IP network 200 and the mobile terminal 56 has moved under the edge router 54 constituting the IP network 200.

  Each of the edge routers 53 and 54 advertises the prefix to the subordinate terminal, 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). CoA under the edge router 53 of the mobile terminal 55 is CoA1, and CoA under the edge router 54 of the mobile terminal 56 is CoA2.

  The home agents 51 and 52 provided in the home networks 301 and 302 manage the movement destinations of the mobile terminals. When each of the mobile terminals 55 and 56 generates a CoA at the movement destination, The generated CoA is notified to the home agents 51 and 52, and the home agents 51 and 52 manage the notified CoA.

  When the mobile terminals 55 and 56 move as described above, an operation in which the mobile terminal 55 transmits a data packet to the mobile terminal 56 is performed. As shown in FIG. 2A, the mobile terminal 55 sends an IP packet having a source address (internal source address) of “HoA1” and a destination address (internal destination address) of “HoA2”. The (external transmission source address) is “CoA1” and the destination address (external destination address) is encapsulated with the IP address “HA1” of the home agent 51 and sent.

  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 having a source address “HoA1” and a destination address “HoA2” as shown in FIG.

  Since the destination address of this packet is “HoA2”, the packet is delivered to the home network 302. However, since the home network 302 does not currently have the mobile terminal 56 having the address “HoA2”, the home agent 52 is connected to the mobile terminal 56. Receive on behalf of

  The home agent 52 currently manages the address “CoA2” by the mobile terminal 56, manages that the received packet is at the address “CoA2” as the destination address, and receives the received packet in FIG. As shown in c), the destination address (external destination address) is “CoA2” and the transmission source address (external transmission source address) is encapsulated with “HA2” which is the IP address of the home agent 52 and transmitted. Since the destination address of this packet is “CoA2”, 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.

  In this way, 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 and moved by the home agent Communication between mobile terminals is possible by transferring to a terminal. These more detailed contents are described in, for example, republished WO2000076247 and Japanese Patent No. 3293762.

  IMS (IP Multimedia Subsystem) incorporating IP and SIP (Session Initiation Protocol) technology is a 3GPP (3rd Generation Partnership Project) as a technology for realizing multimedia services on a mobile terminal network that performs communication as described above. It has been standardized.

  In order to receive IMS service, "IP Multimedia Subsystem (IMS); Stage 2", 3GPP TS23.228 ver.6.8.0, <http://www.3gpp.org/ftp/Specs/latest/Rel-6 As defined in /23_series/23228-680.zip>, the mobile terminal performs session control via a P-CSCF (Proxy-Call Session Control Function) server that is a session control server in the visited network, Communication is started.

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

  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 has an edge router 40 and A P-CSCF server 60 is provided.

  The home agent 50 manages the CoA of the mobile terminal 30 in the visited network 20. The S-CSCF 70 is a SIP server that provides various multimedia services in cooperation with an 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. The P-CSCF server 60 is an SIP server that the mobile terminal 30 accesses first, and transfers the SIP message transmitted from the mobile terminal 30 to the S-CSCF 70 of the home network 10.

  A procedure for registration in the IMS will be described. In FIG. 3, the broken line arrow indicates the upward direction from the mobile terminal 30 to the HSS 80, and the solid line arrow indicates the downward direction 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 in order to receive the multimedia service in the visited network 20. When the mobile terminal 30 transmits the Register message of the P-CSCF server 60 whose destination address includes the subscriber information and home address of the mobile terminal 30, the edge router 40 that has received the Register message is in the visited network 20. Transmit to the P-CSCF server 60. When receiving the Register message, the P-CSCF server 60 registers the subscriber information and home address of the mobile terminal 30, reconstructs the Register message, and transmits it to the S-CSCF 70. When the S-CSCF 70 confirms the validity of the subscriber information included in the Register message via the HSS 80, the information of the mobile terminal 30 and the address of the P-CSCF server 60 are registered, and an OK message is transmitted to the P-CSCF server 60. To do. The P-CSCF server 60 transfers to the mobile terminal 30. The destination at this time is the home address of the mobile terminal 30 included in the Register message. Therefore, the 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.

  According to the IMS registration procedure described above, the P-CSCF server is configured to manage the home address of the mobile terminal. Therefore, when performing downlink communication from the P-CSCF server to the mobile terminal, the home address is always set. There is a problem that the communication path becomes redundant and the delay time becomes long because it goes through a home agent placed on the network.

  The present invention has been made in view of the problems of the prior art as described above, and an object thereof is to realize a packet transfer system and method capable of shortening a communication path and shortening a delay time. .

The packet transfer system 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.
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 an encapsulated 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 a packet transmitted to the server is received, the encapsulated address list is referred to, the address of the front end processing device described corresponding to the address of the server is set as an external destination address, and its own address is set. Encapsulated as an external source address and transferred to the front-end processing unit. When an encapsulated packet addressed to itself is received, the encapsulation is removed, and the packet with the internal source address and the internal destination address is transferred to the internal destination address. ,
When receiving the encapsulated packet addressed to itself, the front-end processing device removes the encapsulation 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. Generating a binding list in which addresses are associated, and upon receiving a packet whose destination address is the address of the mobile terminal, refer to the binding list and described as an external destination address corresponding to the address of the mobile terminal The edge router address is used as an external destination address, and the external source address is encapsulated as its own address and transferred to the edge router.

The edge router according to the present invention is an edge that constitutes a packet forwarding system that forwards and returns a packet transmitted from a mobile terminal together with a front-end processing device that exists between communication paths between the mobile terminal and the server. A router,
An information storage unit for storing an encapsulated 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; ,
An encapsulation processor that performs packet encapsulation;
A decapsulation processing unit for decapsulating the packet;
When the packet transmitted from the mobile terminal to the server is accepted, the encapsulated address list is referred to, and the address of the front end processing device described corresponding to the address of the server is an external destination address. Encapsulation processing using its own address as an external source address is performed by the encapsulation processing unit and transferred to the front-end processing unit. When an encapsulated packet addressed to itself is received, the decapsulation processing unit decapsulates the packet. And a determination control unit that transfers packets based on the internal source address and the internal destination address to the internal destination address.

A front-end processing device according to the present invention is a front-end packet transfer system configured to transfer a packet transmitted from a mobile terminal to a server and send it back together with an edge router existing between communication paths between the mobile terminal and the server. An end processing device,
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 its own address;
An encapsulation processor that performs packet encapsulation;
A decapsulation processing unit for decapsulating the packet;
When an encapsulated packet addressed to itself is received, the decapsulation processing unit performs decapsulation processing for decapsulation, and forwards a packet based on an internal source address and an internal destination address to the internal destination address, and the binding list The internal source address and the external source address are registered in association 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 the external destination address corresponding to the address of the mobile terminal A determination control unit that performs the process of encapsulating the address of the edge router described as the external destination address, and encapsulating the external source address as its own address, and transferring it to the edge router, It is characterized by having.

A packet transfer system according to 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.
An edge router existing between communication paths between the mobile terminal and the server;
The edge router includes an encapsulated 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 encapsulated address list, and Encapsulate server address as external destination address, self address as external source address, transfer to the server, and when encapsulated packet addressed to self is received, decapsulate, internal source address and internal destination Forward packets by address to the internal destination address,
When the server receives the encapsulated packet addressed to itself, it decapsulates and forwards the packet with the internal source address and the internal destination address to the internal destination address, and sets the internal source address and the external source address. When the associated binding list is generated and a packet whose destination address is the address of the mobile terminal is transmitted, the binding list is referred to, and the external destination address corresponding to the address of the mobile terminal is described. The edge router address is used as an external destination address, and the external source address is encapsulated as its own address 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 that transfers a packet transmitted from a mobile terminal to a server,
An information storage unit for storing an encapsulated 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;
When receiving a packet transmitted from the mobile terminal to the server, the encapsulation address list is referred to, and the process of encapsulating the server address as an external destination address and the self address as an external source address When the encapsulated packet is forwarded to the server and the encapsulated packet addressed to itself is received, the decapsulation processor decapsulates the packet by the internal source address and the internal destination address. And a determination control unit that transfers to a destination address.

The server of the present invention is a server that receives a packet transmitted from a mobile terminal via 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 its own address;
An encapsulation processor that performs packet encapsulation;
A decapsulation processing unit for decapsulating the packet;
When an encapsulated packet addressed to itself is received, the decapsulation processing unit performs decapsulation processing for decapsulation, and forwards a packet with an internal source address and an internal destination address to the internal destination address, and the binding list The internal source address and the external source address are registered in association with each other, and the external address corresponding to the address of the mobile terminal is referred to when the packet whose destination address is the address of the mobile terminal is transmitted. Judgment control unit for causing the encapsulation processing unit to perform the process of encapsulating the address of the edge router described as the destination address as the external destination address and the external source address as its own address, and transferring it to the edge router It is characterized by that.

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.
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 an encapsulated 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, and the mobile terminal 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, are managed in correspondence with the home address, and the mobile terminal sends the server to the server. When the packet transmitted to the server is received, the encapsulated address list is referred to, 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 set as the external address Capse as the source address The transferred to the front-end processor, remove the encapsulation receives the encapsulated packet addressed to RCoA addressed or LCoA, forwards the packet by the internal source address and the internal destination address to an internal destination address turned into by,
When receiving the encapsulated packet addressed to itself, the front-end processing device removes the encapsulation 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. Generating a binding list in which addresses are associated, and upon receiving a packet whose destination address is the address of the mobile terminal, refer to the binding list and described as an external destination address corresponding to the address of the mobile terminal Encapsulating the mobile terminal's RCoA as an external destination address, encapsulating 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, and 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 an external destination 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 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,
An encapsulated address list in which an address of the server is described as an internal destination address, an address of the front-end processing device corresponding to the address of the server is described as an external destination address, and a subnet held by the MAP for the mobile terminal A binding cache that manages the RCoA that is the CoA created in step 1 and the LCoA that is the CoA created in the subnet held by the edge router in correspondence with the home address, 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 a packet transmitted from the mobile terminal to the server is received, the encapsulation address list and the binding cache are referred to, and the address of the front-end processing device described corresponding to the server address is set as an external destination. And encapsulating the RCoA of the mobile terminal as an external source address, causing the encapsulation processing unit to transfer the packet to the front-end processing device, and receiving the encapsulated packet addressed to RCoA or LCoA Then, the decapsulation processing unit performs decapsulation processing for decapsulation, and includes a determination control unit that transfers a packet based on the internal transmission source address and the internal destination address to the internal destination address.

A front-end processing device according to another aspect of the present invention provides a packet transfer system for transferring a packet transmitted from a mobile terminal to a server and returning the packet, and an edge router existing between communication paths between the mobile terminal and the server, and A front-end processing device configured with MAP,
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 its own address;
An encapsulation processor that performs packet encapsulation;
A decapsulation processing unit for decapsulating the packet;
When an encapsulated packet addressed to itself is received, the decapsulation processing unit performs decapsulation processing for decapsulation, and forwards a packet with an internal source address and an internal destination address to the internal destination address, and the binding list The internal source address and the external source address are registered in association 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 the external destination address corresponding to the address of the mobile terminal A determination control unit that encapsulates the RCoA of the mobile terminal described in the above as an external destination address and encapsulates the external source address as its own address, and transfers it to the MAP. It is characterized by having.

The MAP of the present invention configures a packet transfer system that transfers a packet transmitted from a mobile terminal to a server and sends it back together with an edge router and a front-end processing device that exist between communication paths between the mobile terminal and the server. MAP,
An information storage unit for storing a binding cache for managing 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, an LCoA corresponding to the RCoA that is the destination address of the received packet is set as an external destination address, and its own address is encapsulated as an 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 from a mobile terminal to a server and returning the packet.
An edge router and a MAP that exist between communication paths between the mobile terminal and the server;
The edge router has an encapsulated address list in which the address of the server is described as an internal destination address, and the RCoA that is a CoA created in the subnet held by the MAP for the mobile terminal and the edge router holds LCoA, which is a CoA created in the subnet, is managed in correspondence with a home address, and when a packet transmitted from the mobile terminal to the server is received, the encapsulated address list is referred to, and the address of the server is determined. The external destination address is encapsulated, and the RCoA of the mobile terminal is encapsulated as an external source address and transferred to the server. When an encapsulated packet destined for RCoA or LCoA is received, the encapsulation is removed, and the internal source address and internal address Internal packet with destination address Transfer to the previous address,
When the server receives the encapsulated packet addressed to itself, it decapsulates and forwards the packet with the internal source address and the internal destination address to the internal destination address, and sets the internal source address and the external source address. The mobile terminal described as an external destination address corresponding to the address of the mobile terminal by generating an associated binding list and referring to the binding list when transmitting a packet whose destination address is the address of the mobile terminal Encapsulate the terminal RCoA as an external destination address, encapsulate 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, and 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 an external destination 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 transfer system that transfers a packet transmitted from the mobile terminal to a server. ,
An encapsulated address list in which the address of the server is described as an internal destination address, an RCoA that is a CoA created in the subnet held by the MAP for the mobile terminal, and a CoA created in a subnet held by the edge router A binding cache that manages a certain LCoA 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;
When a packet transmitted from the mobile terminal to the server is received, the encapsulated address list and binding cache are referred to, the server address is set as an external destination address, and the mobile terminal RCoA is set as an external source address. The encapsulating process unit performs the process to be transferred to the server, and when the encapsulated packet addressed to the RCoA or the LCoA is received, the decapsulation process unit performs the decapsulation process, and the internal source address and And a determination control unit that transfers a packet with the internal destination address to the internal destination address.

A server according to another aspect of the present invention is a server that receives a packet transmitted from a mobile terminal via 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 its own address;
An encapsulation processor that performs packet encapsulation;
A decapsulation processing unit for decapsulating the packet;
When an encapsulated packet addressed to itself is received, the decapsulation processing unit performs decapsulation processing to transfer a packet based on the internal source address and the internal destination address to the internal destination address, and in the binding list Register an address and an external source address in association with each other, refer to the binding list when transmitting a packet whose destination address is the address of the mobile terminal, and describe it as an external destination address corresponding to the address of the mobile terminal A determination control unit that causes the encapsulation processing unit to perform the process of encapsulating the mobile terminal RCoA as an external destination address and the external source address as its own address, and transferring the result to the MAP. It is characterized by.

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 existing between communication paths between the mobile terminal and the server;
The mobile terminal includes an encapsulated 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 encapsulated address list, the address of the front-end processing device described corresponding to the address of the server is used as an external destination address, and its own CoA is encapsulated as an external source address. Forward to the front-end processing device, and when receiving the encapsulated packet addressed to its own CoA, the encapsulation is removed.
When receiving the encapsulated packet addressed to itself, the front-end processing device removes the encapsulation 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. Generating a binding list in which addresses are associated, and upon receiving a packet whose destination address is the address of the mobile terminal, refer to the binding list and described as an external destination address corresponding to the address of the mobile terminal The mobile terminal CoA is encapsulated as an external destination address and the external source address is encapsulated as its own address, and transferred to the mobile terminal.

The mobile terminal 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 existing between communication paths with the server,
An information storage unit storing an encapsulated 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 ,
An encapsulation processor that performs packet encapsulation;
A decapsulation processing unit for decapsulating the packet;
Refers to the encapsulated address list when transmitting to the server, sets the address of the front end processing device described in correspondence with the address of the server as an external destination address, and sets its own CoA as an external source Decapsulation that causes the encapsulation processing unit to perform the process of encapsulating as an address, transfers it to the front-end processing device, and receives the encapsulated packet addressed to its own CoA, and then decapsulates the decapsulation processing unit. And a judgment control unit that performs processing.

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 an encapsulated 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 managing RCoA, which is a CoA created in a subnet held by the MAP, and LCoA, which is a CoA created in a subnet in the area, corresponding to the home address and transmitting to the server, Referring to the encapsulated address list, the front end processing device address described in correspondence with the server address is used as an external destination address, and the RCoA of the mobile terminal is encapsulated as an external transmission source address to generate the front end. Transfer to processor and address to RCoA or Remove the encapsulation receives the encapsulated packet addressed to CoA,
When receiving the encapsulated packet addressed to itself, the front-end processing device removes the encapsulation 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. Generating a binding list in which addresses are associated, and upon receiving a packet whose destination address is the address of the mobile terminal, refer to the binding list and described as an external destination address corresponding to the address of the mobile terminal Encapsulating the mobile terminal's RCoA as an external destination address, encapsulating 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, and 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 an external destination address, Is transferred to the edge router as a packet encapsulated as an external source address.

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,
Created with an encapsulated 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 a subnet held by the MAP about itself An information storage unit that stores a binding cache that manages an RCoA that is a registered CoA and an LCoA that is a CoA created in a subnet that is located in correspondence with a home address;
An encapsulation processor that performs packet encapsulation;
A decapsulation processing unit for decapsulating the packet;
When transmitting to the server, the encapsulated address list is referred to, 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 in the decapsulation processing unit when the encapsulated packet addressed to RCoA or LCoA is received. And a determination control unit that performs decapsulation processing for removing the data.

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.
An edge router and a MAP that exist between communication paths between the mobile terminal and the server;
The edge router includes an encapsulated 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. RCoA, which is a CoA created in the subnet held by the network, and an LCoA, which is a CoA created in the subnet held by the edge router, are managed in correspondence with the home address, and transmitted from the mobile terminal to the server When the received packet is received, the encapsulated address list is referred to, the MAP address described corresponding to the server address is used as an external destination address, and the RCoA of the mobile terminal is encapsulated as an external source address. Forward to the MAP, RC Remove the encapsulation receives the encapsulated packet addressed to A addressed or LCoA, 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 an encapsulated packet addressed to itself, the MAP removes the encapsulation and sends the packet based on the internal source address and the internal destination address to the internal destination address. A binding list in which an internal source address and an 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 the address of the mobile terminal When the RCoA of the mobile terminal described as the external destination address corresponding to is used as an external destination address, the packet is transferred as a packet encapsulated with its own address as the external source address, and a packet with the destination address of RCoA is received. Destination address of received packet There RCoA corresponding LCoA to the external destination address, characterized in that it transferred to the edge router as encapsulated packet its own address as the external source address.

An edge router according to still another embodiment of the present invention configures 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 the internal destination address, the encapsulated address list in which the address of the MAP corresponding to the address of the server is described as the external destination address, and the subnet held by the MAP for the mobile terminal An information storage unit that stores an RCoA that is a CoA and an LCoA that is a CoA created in a subnet held by the edge router in correspondence with a home address;
An encapsulation processor that performs packet encapsulation;
A decapsulation processing unit for decapsulating the packet;
When a packet transmitted from the mobile terminal to the server is received, the encapsulation address list is referred to, the MAP address described corresponding to the server address is set as an external destination address, and the mobile terminal Encapsulating the RCoA as an external source address in the encapsulation processing unit, transferring it to the MAP, and receiving the encapsulated packet destined for RCoA or LCoA, encapsulating in the decapsulation processing unit And a determination control unit that performs decapsulation processing for removing the packet and transfers a packet based on the internal source address and the internal destination address to the internal destination address.

A MAP according to another aspect of the present invention is configured to configure a packet transfer system that forwards a packet transmitted from a mobile terminal to a server and returns the packet together with an edge router existing between communication paths between the mobile terminal and the server. Because
A binding cache that manages RCoA and LCoA of the mobile terminal in association with each other, a binding list that associates an internal source address and an external source address, 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 an encapsulated packet addressed to itself is received, the decapsulation processing unit performs decapsulation processing for decapsulation, and forwards a packet based on the internal source address and the internal destination address to the internal destination address, and at the internal source An 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 described as an external destination address corresponding to the address of the mobile terminal When the RCoA of the mobile terminal being used as an external destination address and encapsulating with its own address as an external source address is transferred to the encapsulation processing unit and received, a packet having a destination address of RCoA is received. Packet destination address A determination control unit that encapsulates the LCoA corresponding to a certain RCoA as an external destination address and encapsulates the address as an external transmission source address and causes the encapsulation processing unit to transfer the result to the edge router. Characteristic MAP.

A packet transfer system according to still another aspect of the present invention is a packet transfer system including a mobile terminal and a MAP,
The mobile terminal has an encapsulated 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, and the MAP holds the self about the self When the RCoA, which is a CoA created in a subnet, and the LCoA, which is a CoA created in the existing subnet, are managed in correspondence with the home address and transmitted to the server, the encapsulated address list The MAP address described in correspondence with the server address is used as an external destination address, the RCoA of the mobile terminal is encapsulated as an external source address, transferred to the MAP, and sent to the RCoA or LCoA. When receiving an encapsulated packet addressed to Remove the cell of,
When the MAP manages the RCoA and LCoA of the mobile terminal in correspondence with each other and receives an encapsulated packet addressed to itself, the MAP removes the encapsulation and sends the packet based on the internal source address and the internal destination address to the internal destination address. A binding list in which an internal source address and an 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 the address of the mobile terminal When the RCoA of the mobile terminal described as the external destination address corresponding to is used as an external destination address, the packet is transferred as a packet encapsulated with its own address as the external source address, and a packet with the destination address of RCoA is received. Destination address of received packet There RCoA corresponding LCoA to the external destination address, characterized in that it transferred to the edge router as encapsulated packet its own address as the external source address.

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.
The encapsulated address list in which the address of the server is described as the internal destination address, the address of the MAP corresponding to the address of the server is described as the external destination address, and the CoA created in the subnet held by the MAP about itself An information storage unit that stores a binding cache that manages an RCoA corresponding to a home address and an RCoA that is a CoA created in a subnet that is in the area;
An encapsulation processor that performs packet encapsulation;
A decapsulation processing unit for decapsulating the packet;
When transmitting to the server, the encapsulated 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 externally transmitted. Decapsulation processing for decapsulating the decapsulation processing unit when encapsulating the original address is performed by the encapsulation processing unit, transferred to the MAP, and receiving the encapsulated packet addressed to RCoA or LCoA And a judgment control unit for performing the above.

  The program according to the present invention is a program for realizing each of the above-described constituent elements by a computer system, and the recording medium according to the present invention stores the above-described program.

  In the present invention configured as described above, the encapsulated address list is referred to, and the registered server is encapsulated and transferred. This encapsulation is released before processing by the server, but 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 sender registered in the binding list.

  Since transmission to the mobile terminal is performed without going through the home network from the visited network in communication in the downlink direction, there is an effect that the communication path can be shortened.

It is a figure which shows the structure of the mobile communication network by Mobile IPv6. (A)-(c) is a figure which shows the structure of an IP packet. It is a figure which shows the communication operation | movement for receiving IMS service. It is a block diagram which shows the structure of the 1st Example of the packet transfer system comprised by this invention. It is a figure which shows the structure of the edge router 140 in FIG. It is a figure which shows the registration content of the encapsulation address list 401 in FIG. It is a flowchart which shows operation | movement of the edge router 140 in FIG. It is a figure which shows the structure of the front end processing apparatus 190 in FIG. It is a figure which shows the registration content of the binding list in FIG. It is a flowchart which shows operation | movement of the front end processing apparatus 190 in FIG. It is a figure which shows operation | movement of a 1st Example with header information. It is a block diagram which shows the structure of the 2nd Example of the packet transfer system comprised by this invention. It is a figure which shows the structure of the edge router 240 in FIG. It is a flowchart which shows operation | movement of the edge router 240 in FIG. It is a flowchart which shows operation | movement of the front end processing apparatus 290 in FIG. It is a figure which shows operation | movement of a 2nd Example with header information. It is a block diagram which shows the structure of the 3rd Example of the packet transfer system comprised by this invention. It is a block diagram which shows the structure of the P-CSCF server 1160 in FIG. It is a figure which shows operation | movement of a 3rd Example with header information. It is a block diagram which shows the structure of the 4th Example of the packet transfer system comprised by this invention. It is a figure which shows operation | movement of a 4th Example with header information. It is a block diagram which shows the structure of the 5th Example of the packet transfer system comprised by this invention. It is a block diagram which shows the structure of the mobile terminal 1130 in FIG. It is a figure which shows operation | movement of a 5th Example with header information. It is a block diagram which shows the structure of the 6th Example of the packet transfer system comprised by this invention. It is a block diagram which shows the structure of the mobile terminal 1230 in FIG. It is a figure which shows operation | movement of a 6th Example with header information. It is a block diagram which shows the structure of the 7th Example of the packet transfer system comprised by this invention. It is a block diagram which shows the structure of MAP1200 in FIG. It is a figure which shows operation | movement of a 7th Example with header information. It is a block diagram which shows the structure of the 8th Example of the packet transfer system comprised by this invention. It is a figure which shows operation | movement of an 8th Example with header information.

Explanation of symbols

110, 210 Home network 120, 220 Visited network 130, 230 Mobile terminal 140, 240 Edge router 150, 250 Home agent 160, 260 P-CSCF
170,270 S-CSCF
180 HSS
200 MAP

  Next, embodiments of the present invention will be described with reference to the drawings.

First Embodiment FIG. 4 is a block diagram showing the configuration of a first embodiment of a 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-CSCF 160, the S-CSCF 170, and the HSS 180 are the home network 10, the visited network 20, and the mobile terminal 30 shown in FIG. The home agent 50, the P-CSCF 60, the S-CSCF 70, and the HSS 80 perform the same operation. In the present 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 a network in which a plurality of edge routers are integrated, and only one mobile terminal 130, edge router 140, P-CSCF 160, and front-end processing device 190 are shown in FIG. However, there are actually a plurality of them.

  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 the P-registered in the encapsulated address list. A packet addressed to the address of the CSCF 160 has a function of encapsulating and forwarding the destination address as the address of the associated front-end processing device 190 and the 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 encapsulation address list 401 and an ER address 402 that is its own address, a determination control unit 403, an interface unit 404, and an encapsulation processing unit. 405, a decapsulation processing unit 406, and a routing processing unit 407.

  The judgment control unit 403 refers to the contents stored in the information storage unit 400 for packets transmitted and received via the interface unit 404, and controls the processing contents performed by each of the above units according to the result. The encapsulation processing unit 405 and the decapsulation processing unit 406 perform the encapsulation process and the decapsulation process in accordance with the control of the determination control unit 403, respectively, and send out the processed packets and the like to the outside in the routing processing unit 407 and This is performed via the interface unit 404.

FIG. 6 is a diagram showing registration contents of the encapsulated address list 401. Actually, specific addresses of the P-CSCF 160 and the front-end processing device 190 are registered, but for the sake of easy understanding, the names of the P-CSCF 160 and the front-end processing device 190 are changed to their respective addresses. Show. As shown in FIG. 6, the addresses of the front-end processing devices 190 _{1 to} 190 ₂ are registered in the addresses of the P-CSCFs 160 _{1 to} 160 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 checks 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. When 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. (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 not registered in the encapsulated address list 401, 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 A unit 505, an encapsulation processing unit 506, a decapsulation processing unit 507, and a routing processing unit 508.

  The judgment control unit 504 refers to the contents stored in the information storage unit 500 for packets transmitted and 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 under the control of the determination control unit 504, and the encapsulation processing unit 506 and the decapsulation processing unit 507 perform encapsulation processing according to the control of the determination control unit 504. In addition, the decapsulation process is performed, and the processed packet is transmitted to the outside via the routing processing unit 508 and the interface unit 505.

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 associates the internal source address with the external source address. The generated binding list 501 is generated. FIG. 9 is a diagram showing registration contents of the binding list. Actually, specific addresses of the mobile terminal 130 and the edge router 140 are registered, but in order to facilitate understanding, here, the names of the mobile terminal 130 and the edge router 140 are changed to the respective addresses. As shown in FIG. 9, the addresses of the edge routers 140 _{1 to} 140 ₂ are registered in the addresses of the mobile terminals 130 _{1 to} 130 ₂ .

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

  When receiving the packet (step S501), the determination 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 the binding list 501 in which the internal source address and the external source address shown in FIG. 9 are associated with each other is generated (step S504). It transfers as a destination address (step S505) and ends. When 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 S507). ). If the destination address is registered in the binding list 501 as a source address, the corresponding external source address is set as the external destination address, and its own address is encapsulated as the external source address (step S508) and transferred. (Step S509) The process ends. If it is confirmed in step S507 that the destination address is not registered in the binding list 501 as the internal source address, the destination address is transferred to the destination address as it is (step S510), and the process ends.

  Note that 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, and the encapsulated address list and the binding list are stored in the storage device. Stored in

  FIG. 11 is a diagram showing the operation when the user of the mobile terminal 130 performs registration with the IMS together with the header information centering on the edge router 140 and the front-end processing device 190. The following is a specific example of this embodiment. A typical operation will be described with reference to FIGS.

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

  (1) When the mobile terminal 130 moves to the visited network 120, the mobile terminal 130 registers with the IMS in order to receive the multimedia service in the visited network 120.

  When the mobile terminal 130 transmits the Register message of the mobile terminal 130 including the subscriber information and home address of the mobile terminal 130, the source address is the mobile terminal 130, and the destination address is the P-CSCF server 160, the Register message is transmitted to the mobile terminal 130. Is received by the edge router 140. 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 the 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 transferred 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) and the external transmission source address (edge router 140) are associated with each other is generated.

  (3) Upon receiving the packet transferred from the front-end processing device 190, the P-CSCF server 160 registers the subscriber information and home address of the mobile terminal 30, reconstructs the Register message, and sets the source address as its own ( A packet having the destination address as the S-CSCF server 170 is generated and transferred to the S-CSCF server 170.

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

  (5) The P-CSCF server 160 sets the destination address of the received packet as the home address of the mobile terminal 130 included in the Register message, and sets the source address as self (P-CSCF server 160) to the front-end processing device 190. Forward. The transfer operation to the front-end processing device 190 here is uniquely performed regardless of the destination address.

  (6) Upon reception of the packet transferred from the P-CSCF server 160, the front-end processing device 190 confirms the destination address. In this case, since the destination address is not addressed to itself but addressed to the mobile terminal 130, the edge router 140 registered as the external source address corresponding to the mobile terminal 130 of the internal source address is referred to the binding list. The external destination address is encapsulated as the external source address of itself (front-end processing device 190) and transmitted to the edge router 140.

  (7) Upon receiving the packet transferred from the front-end processing device 190, the edge router 140 confirms the destination address. In this case, since the destination address is addressed to itself, it is decapsulated to remove the encapsulation and transferred to the mobile terminal 130.

  In the present embodiment configured as described above, transmission to the mobile terminal is performed without going through the home network from the visited network in communication in the downlink direction, and the communication path can be shortened. It was.

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

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

  10, home network 210, visited network 220, P-CSCF 260, S-CSCF 270, and HSS 280 are the same as home network 110, visited network 120, P-CSCF 160, S-CSCF 170, and HSS 180 shown in FIG. Perform the operation.

  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, HoA that is an IP address created in the subnet held by the home agent 250 as an address, RCoA (Regional Care-of Address) that is a 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 to be used.

  The edge router 240 manages the address of the MAP 200 and advertises it to the subordinate mobile terminal together with its own address. The mobile terminal 230 receives the advertisement of the edge router 240 to generate RCoA and LCoA, and the home agent 250 Is notified of the correspondence between HoA and RCoA, and MAP 200 is notified of the correspondence between RCoA and LCoA. Based on this notification, the home agent 250 manages the correspondence between the HoA and RCoA of the mobile terminal 230, and the MAP 200 manages the correspondence between the RCoA and LCoA of the mobile terminal 230. The edge router 240 manages all of the HoA, RCoA, and LCoA of the mobile terminal 230.

  Similarly to the edge router 140 shown in FIG. 4, the edge router 240 in the present embodiment also includes an encapsulated address list in which the address of the front-end processing device 290 is registered in association with the address of the P-CSCF 260. A packet addressed to the P-CSCF 260 address registered in the encapsulated address list has the function of encapsulating and transferring the destination address as the address of the associated front-end processing device 290. Here, the difference from the embodiment shown in FIG. 4 is that, in the embodiment shown in FIG. 4, the source address is the self address, but in this embodiment, it is encapsulated as the RCoA of the mobile terminal 230. It is.

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

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

  The judgment control unit 604 refers to the contents stored in the information storage unit 600 for packets transmitted and received via the interface unit 605, and controls the processing contents performed by each of the above units according to the result. The encapsulation processing unit 606 and the decapsulation processing unit 607 perform the encapsulation process and the decapsulation process according to the control of the determination control unit 604, respectively, and send out the processed packets and the like to the outside in the routing processing unit 608 and This is performed via 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.

  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 transmission source address is encapsulated by the RCoA of the mobile terminal 230, the internal transmission source address (mobile terminal) and external transmission are received. A binding list associated with the original address (RCoA) is 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.

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

  14 and 15 are flowcharts showing the operations of the edge router 240 and the front-end processing device 290, respectively.

  Regarding the operation of this 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). If the destination address is a packet addressed to RCoA or LCoA managed by the destination address, it is decapsulated (step S903), transferred to the internal destination address (step S604), and the process ends. When it is confirmed in step S902 that the destination address is not the RCoA or LCoA managed by itself, the encapsulated address list 601 is searched (step S905), and the destination address is registered in the encapsulated address list 601. (Step S906). When the destination address is registered in the encapsulated address list 601, the address of the corresponding front-end processing device 290 registered as the external destination address is used, and the RCoA corresponding to the internal source address is the external source address. (Step S907), transfer to the external destination address (step S908), and end. When it is confirmed in step S906 that the destination address is not registered in the encapsulated address list 601, it 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 the front-end processing device 190 receives the packet (step S1001), it 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 S1003), and a binding list 501 in which the internal source address (mobile terminal) and the external source address (RCoA) are associated with each other is generated (step S1004) and transferred. (Step S1005), and the process ends. If it is confirmed in step S1002 that the destination address is not its own address, the binding list 501 is searched to check whether the destination address is registered as an internal source address (step S1007). When 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 S 1008), to the MAP 200. Transfer (step S1009) to finish. If it is confirmed in step S1007 that the destination address is not registered as a source address in the binding list 501, the destination address is transferred to the destination address as it is (step S1010), and the process ends.

  FIG. 16 is a diagram showing the operation when the user of the mobile terminal 230 performs registration with the IMS together with the header information with the edge router 240 and the front-end processing device 290 as the center. A typical operation will be described with reference to FIGS.

  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 from the HSS 280 to the mobile terminal 230.

  (1) When the mobile terminal 230 moves to the visited network 220, the mobile terminal 230 registers with the IMS in order to receive the multimedia service in the visited network 220. When the mobile terminal 230 includes the subscriber information of the mobile terminal 230 and the home address, the source address is the mobile terminal 230 and the destination address is a Register message of the P-CSCF server 260, the Register message is transmitted to the mobile terminal 230. Is received by the edge router 240. 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. The RCoA of the mobile terminal 230 is encapsulated as an external source address and 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 set as the source address, and the internal destination address (P-CSCF server 260) is set as the destination address. The transferred packet is transferred to the P-CSCF server 260. When decapsulation is performed, a binding list in which the internal source address (mobile terminal 130) is associated with the external source address (RCoA) is generated.

  (3) Upon receiving the packet transferred from the front-end processing device 290, the P-CSCF server 260 registers the subscriber information and home address of the mobile terminal 30, reconstructs the Register message, and sets the source address as its own ( A packet having the destination address as the S-CSCF server 270 is generated and transferred to the S-CSCF server 270.

  (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 the information on the mobile terminal 130 and the P- The address of the CSCF server 260 is registered, and an OK message is transmitted to the P-CSCF server 260 with the source address as the S-CSCF server 270 and the destination address as the P-CSCF server 260.

  (5) The P-CSCF server 260 sets the destination address of the received packet as the home address of the mobile terminal 230 included in the Register message, and sets the source address as self (P-CSCF server 260) to the front-end processing device 290. Forward. The transfer operation to the front-end processing device 290 here is uniquely performed regardless of the destination address.

  (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 not addressed to itself but to the mobile terminal 230, the RCoA registered as the external source address corresponding to the mobile terminal 230 of the internal source address with reference to the binding list is referred to as the external destination. The address is encapsulated as an external source address of itself (front end processing device 290) and transferred to the MAP 200. The transfer operation to the MAP 200 here is performed by the RCoA that is the destination address.

  (7) Upon receiving the packet transferred from the front-end processing device 290, the MAP 200 transfers the packet to the edge router 240. In this transfer 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 transfer packet and the self (MAP) address as the external source address of the transfer packet. Transfer as a packet. The transfer operation to the edge router 240 here is performed by the destination address LCoA.

  (8) Upon receiving the packet transferred from the MAP 200, the edge router 240 confirms the destination address. In this case, since the destination addresses are LCoA and RCoA, decapsulation for removing the encapsulation is performed twice, and the packet is transferred to the mobile terminal 230.

  In the present embodiment configured as described above, since the downlink communication transferred by the MAP 200 uses LCoA, the edge router that moves and moves the mobile terminal is changed. Is sent to the edge router under the control of the mobile terminal.

Third Embodiment 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 constructed 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 incorporated in the P-CSCF server 160 as a P-CSCF server 1160. Since the other configuration is the same as that of the embodiment shown in FIG. 4, the same numbers as those in FIG.

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

  The judgment control unit 704 refers to the contents stored in the information storage unit 700 for the packets transmitted / received via the interface unit 705, and controls the processing contents performed by each of the above units according to the result. The list registration processing unit 703 performs registration processing in the information storage unit 700 according to the control of the determination control unit 704, and the encapsulation processing unit 706 and the decapsulation processing unit 707 perform encapsulation processing according to the control of the determination control unit 704. The decapsulation process is performed, and the processed packet is transmitted to the outside via the routing processing unit 709 and the interface unit 705. Further, processing as a P-CSCF server is performed by the P-CSCF processing unit 706.

  FIG. 19 is a diagram illustrating an operation when the user of the mobile terminal 130 performs registration in the IMS together with the header information with the edge router 140 as a center. In the case of this embodiment, the edge router 140 does not need to manage the external destination address of the encapsulated address list. For the packet from the mobile terminal 130 to the P-CSCF server 1160, as shown in FIG. 19, the external source address is the address of itself (edge router), and the address of the P-CSCF server is used for the external destination address. Encapsulation will be performed.

Fourth Embodiment Next, a fourth embodiment of the present invention will be described.

  FIG. 20 is a block diagram showing the configuration of a fourth embodiment of the packet transfer system according to the present invention. FIG. 21 shows the operation when the user of the mobile terminal 230 performs registration in the IMS, and the edge router 240 The following is a description of the specific operation of this embodiment with reference to FIGS. 20 and 21. FIG.

  In this embodiment, the function of the front-end processing device 290 in the second embodiment shown in FIG. 12 is incorporated into the P-CSCF server 260 to form a P-CSCF server 1260. Since other configurations are the same as those of the embodiment shown in FIG. 12, the same reference numerals 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 the case of the present embodiment, the edge router 240 does not need to manage the external destination address of the encapsulated address list as in the third embodiment. As shown in FIG. 21, the packet from the mobile terminal 230 to the P-CSCF server 1260 is encapsulated using the external source address as RCoA and the external destination address using the address of the P-CSCF server 1260. It will be.

Fifth Embodiment 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 constructed according to the present invention.

  In the present embodiment, the function of the edge router 140 in the first embodiment shown in FIG. Since the other configuration is the same as that of the embodiment shown in FIG. 4, the same numbers as those in FIG.

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

  As shown in FIG. 23, the mobile terminal 1130 includes an information storage unit 800 that stores an encapsulated address list 801, a binding cache 802 that manages its own HoA and CoA, an MIP control processing unit 803, a determination control unit 804, The 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 configured.

  The judgment control unit 804 refers to the contents stored in the information storage unit 800 for packets transmitted and received via the interface unit 805, and controls the processing contents performed by each of the above units according to the result. The encapsulation processing unit 807 and the decapsulation processing unit 808 perform the encapsulation processing and the decapsulation processing according to the control of the determination control unit 804, respectively, and send the processed packets and the like to the outside in the routing processing unit 809 and This is performed via 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 an application display under the control of the determination control unit 804.

  FIG. 24 is a diagram showing an operation when the user of the mobile terminal 1130 performs registration in the IMS together with header information centering on the mobile terminal 1130. In the case of this embodiment, the mobile terminal 1130 is a front end. When transmitting a packet to the 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 encapsulated using the address of the front-end processing device 190. It becomes.

Sixth Embodiment 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 constructed according to the present invention.

  In the present embodiment, the function of the edge router 240 in the second embodiment shown in FIG. Since other configurations are the same as those of the embodiment shown in FIG. 12, the same reference numerals as those in FIG.

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

  As shown in FIG. 23, the mobile terminal 1230 includes an information storage unit 1400 that stores an encapsulated address list 1401, a binding cache 1402 that manages all of its own HoA, RCoA, and LCoA, an HMIP control processing unit 1403, and judgment control. A 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.

  The judgment control unit 1404 refers to the contents stored in the information storage unit 1400 for the packet transmitted / received via the interface unit 1405, and controls the processing contents performed by each of the above units according to the result. The encapsulation processing unit 1407 and the decapsulation processing unit 1408 perform the encapsulation processing and the decapsulation processing according to the control of the determination control unit 1404, respectively, and send out the processed packets and the like to the outside in the routing processing unit 1409 and This is performed via the interface unit 1405. The HMIP control processing unit 1403 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 an application display under the control of the determination control unit 1404.

  FIG. 27 is a diagram illustrating an operation when the user of the mobile terminal 1230 performs registration in the IMS, with the header information centered on the mobile terminal 1230.

  In 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 is the front Encapsulation using the address of the end processing device 190 is performed.

Seventh Embodiment 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 constructed according to the present invention.

  In this embodiment, the function of the front-end processing device 290 in the second embodiment shown in FIG. Since other configurations are the same as those of the embodiment shown in FIG. 12, the same reference numerals as those in FIG.

  FIG. 29 is a block diagram showing a main configuration of the MAP 1200 in this embodiment.

  As shown in FIG. 29, the MAP 1200 includes an information storage unit 1500 that stores a binding list 1501, a MAP address 1502 that is its own address, a binding cache 1503 that manages the RCoA and LCoA of the mobile terminal 230, and an HMIP control processing unit. 1504, a determination control unit 1505, an interface unit 1506, an encapsulation processing unit 1507, a decapsulation processing unit 1508, and a routing processing unit 1509.

  The judgment control unit 1505 refers to the contents stored in the information storage unit 1500 for the packets transmitted / received via the interface unit 1506, and controls the processing contents performed by each of the above units according to the result. An encapsulation processing unit 1507 and a decapsulation processing unit 1508 perform an encapsulation process and a decapsulation process in accordance with the control of the determination control unit 1505, respectively, and send out the processed packets and the like to a routing processing unit 1509 and This is performed via the interface unit 1506. The HMIP control processing unit 1504 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 the user of the mobile terminal 230 performs registration in the IMS together with the header information with the edge router 240 as a center.

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

Eighth Embodiment 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 according to the present invention, and FIG. 32 shows the operation when the user of the mobile terminal 2230 performs registration in the IMS. The MAP 2200 is shown together with the header information, and the specific operation of this embodiment will be described below with reference to FIGS. 31 and 32. FIG.

  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 be the mobile terminal 2230, and the function of the front-end processing device 290 is incorporated in the MAP 200 to form the MAP 2200. is there. Since other configurations are the same as those of the embodiment shown in FIG. 12, the same reference numerals as those in FIG. The configuration of the mobile terminal 2230 is the same as that of the mobile terminal 1230 shown in FIG. 26, and the configuration of the MAP 2200 is the same as that of the 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 in the internal destination address of the encapsulated address list, the external source address is set to RCoA as shown in FIG. The external destination address is encapsulated using the MAP 2200 address.

  By performing packet transfer as described in the above embodiments, the communication path can be shortened. In addition, although it demonstrated as a system for receiving IMS service in any of the Example mentioned above, you may apply to the access system to the server which exists in a visited network. In this case as well, all the above embodiments can be applied.

  Further, the MAP, the edge router, the front-end processing device, and the P-CSCF server are configured by a general computer system including an input device, an output device, a storage device, and a control device. 4 includes a program for causing the computer system to execute the operations performed by the MAP, the edge router, the front-end processing device, and the P-CSCF server described in the above, and a recording medium for storing the program.

Claims (46)

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 front-end processing device that exist between communication paths between the mobile terminal and the server,
The edge router includes an encapsulated 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 a packet transmitted to the server is received, the encapsulated address list is referred to, the address of the front end processing device described corresponding to the address of the server is set as an external destination address, and its own address is set. Encapsulated as an external source address and transferred to the front-end processing unit. When an encapsulated packet addressed to itself is received, the encapsulation is removed, and the packet with the internal source address and the internal destination address is transferred to the internal destination address. ,
When receiving the encapsulated packet addressed to itself, the front-end processing device removes the encapsulation 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. Generating a binding list in which addresses are associated, and upon receiving a packet whose destination address is the address of the mobile terminal, refer to the binding list and described as an external destination address corresponding to the address of the mobile terminal A packet transfer system which encapsulates an address of an edge router as an external destination address and encapsulates an external source address as its own address and transfers the packet to the edge router. A packet transfer system for transferring a packet transmitted from a mobile terminal to a server and returning the packet is an edge router configured with a front-end processing device existing between communication paths between the mobile terminal and the server,
An information storage unit for storing an encapsulated 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; ,
An encapsulation processor that performs packet encapsulation;
A decapsulation processing unit for decapsulating the packet;
When the packet transmitted from the mobile terminal to the server is accepted, the encapsulated address list is referred to, and the address of the front end processing device described corresponding to the address of the server is an external destination address. Encapsulation processing with its own address as an external source address is performed by the encapsulation processing unit and transferred to the front-end processing unit. When an encapsulated packet addressed to itself is received, the decapsulation processing unit decapsulates An edge router, comprising: a determination control unit configured to transfer the packet based on the internal source address and the internal destination address to the internal destination address. A front-end processing device configured to transfer a packet transmitted from a mobile terminal to a server and to return a packet transfer system together with an edge router existing between communication paths between the mobile terminal and the server,
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 its own address;
An encapsulation processor that performs packet encapsulation;
A decapsulation processing unit for decapsulating the packet;
When an encapsulated packet addressed to itself is received, the decapsulation processing unit performs decapsulation processing for decapsulation, and forwards a packet based on an internal source address and an internal destination address to the internal destination address, and the binding list The internal source address and the external source address are registered in association 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 the external destination address corresponding to the address of the mobile terminal A determination control unit that performs the process of encapsulating the address of the edge router described as the external destination address, and encapsulating the external source address as its own address, and transferring it to the edge router, CFC characterized by having End processing apparatus. 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 includes an encapsulated 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 encapsulated address list, and Encapsulate server address as external destination address, self address as external source address, transfer to the server, and when encapsulated packet addressed to self is received, decapsulate, internal source address and internal destination Forward packets by address to the internal destination address,
When the server receives the encapsulated packet addressed to itself, it decapsulates and forwards the packet with the internal source address and the internal destination address to the internal destination address, and sets the internal source address and the external source address. When the associated binding list is generated and a packet whose destination address is the address of the mobile terminal is transmitted, the binding list is referred to, and the external destination address corresponding to the address of the mobile terminal is described. A packet transfer system which encapsulates an address of an edge router as an external destination address and encapsulates an external source address as its own address and transfers the packet to the edge router. 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 from a mobile terminal to a server,
An information storage unit for storing an encapsulated 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;
When receiving a packet transmitted from the mobile terminal to the server, the encapsulation address list is referred to, and the process of encapsulating the server address as an external destination address and the self address as an external source address When the encapsulated packet is forwarded to the server and the encapsulated packet addressed to itself is received, the decapsulation processor decapsulates the packet by the internal source address and the internal destination address. An edge router comprising: a determination control unit configured to transfer to a destination address. A server that receives a packet transmitted from a mobile terminal via 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 its own address;
An encapsulation processor that performs packet encapsulation;
A decapsulation processing unit for decapsulating the packet;
When an encapsulated packet addressed to itself is received, the decapsulation processing unit performs decapsulation processing for decapsulation, and forwards a packet with an internal source address and an internal destination address to the internal destination address, and the binding list The internal source address and the external source address are registered in association with each other, and the external address corresponding to the address of the mobile terminal is referred to when the packet whose destination address is the address of the mobile terminal is transmitted. Judgment control unit for causing the encapsulation processing unit to perform the process of encapsulating the address of the edge router described as the destination address as the external destination address and the external source address as its own address, and transferring it to the edge router And a server characterized by that. A packet transfer system for transferring a packet transmitted from 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 an encapsulated 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, and the mobile terminal 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, are managed in correspondence with the home address, and the mobile terminal sends the server to the server. When the packet transmitted to the server is received, the encapsulated address list is referred to, 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 set as the external address Capse as the source address The transferred to the front-end processor, remove the encapsulation receives the encapsulated packet addressed to RCoA addressed or LCoA, forwards the packet by the internal source address and the internal destination address to an internal destination address turned into by,
When receiving the encapsulated packet addressed to itself, the front-end processing device removes the encapsulation 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. Generating a binding list in which addresses are associated, and upon receiving a packet whose destination address is the address of the mobile terminal, refer to the binding list and described as an external destination address corresponding to the address of the mobile terminal Encapsulating the mobile terminal's RCoA as an external destination address, encapsulating 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, and 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 an 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 configured to transfer a packet transmitted from a mobile terminal to a server and to 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,
An encapsulated address list in which an address of the server is described as an internal destination address, an address of the front-end processing device corresponding to the address of the server is described as an external destination address, and a subnet held by the MAP for the mobile terminal A binding cache that manages the RCoA that is the CoA created in step 1 and the LCoA that is the CoA created in the subnet held by the edge router in correspondence with the home address, 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 a packet transmitted from the mobile terminal to the server is received, the encapsulation address list and the binding cache are referred to, and the address of the front-end processing device described corresponding to the server address is set as an external destination. And encapsulating the RCoA of the mobile terminal as an external source address, causing the encapsulation processing unit to transfer the packet to the front-end processing device, and receiving the encapsulated packet addressed to RCoA or LCoA Then, an edge router comprising: a determination control unit that causes the decapsulation processing unit to perform decapsulation processing for decapsulation and forwards a packet based on an internal transmission source address and an internal destination address to the internal destination address. A front-end processing device configured to transfer a packet transmitted from a mobile terminal to a server and to construct a packet transfer system for returning the packet together with an edge router and a MAP existing between communication paths between the mobile terminal and the server,
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 its own address;
An encapsulation processor that performs packet encapsulation;
A decapsulation processing unit for decapsulating the packet;
When an encapsulated packet addressed to itself is received, the decapsulation processing unit performs decapsulation processing for decapsulation, and forwards a packet based on an internal source address and an internal destination address to the internal destination address, and the binding list The internal source address and the external source address are registered in association 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 the external destination address corresponding to the address of the mobile terminal A determination control unit that encapsulates the RCoA of the mobile terminal described in the above as an external destination address and encapsulates the external source address as its own address, and transfers it to the MAP. Front-end processing characterized by having Apparatus. A packet transfer system 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;
An information storage unit for storing a binding cache for managing 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, an LCoA corresponding to the RCoA that is the destination address of the received packet is set as an external destination address, and its own address is encapsulated as an 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 for transferring a packet transmitted from a mobile terminal to a server and returning the packet,
An edge router and a MAP that exist between communication paths between the mobile terminal and the server;
The edge router has an encapsulated address list in which the address of the server is described as an internal destination address, and the RCoA that is a CoA created in the subnet held by the MAP for the mobile terminal and the edge router holds LCoA, which is a CoA created in the subnet, is managed in correspondence with a home address, and when a packet transmitted from the mobile terminal to the server is received, the encapsulated address list is referred to, and the address of the server is determined. The external destination address is encapsulated, and the RCoA of the mobile terminal is encapsulated as an external source address and transferred to the server. When an encapsulated packet destined for RCoA or LCoA is received, the encapsulation is removed, and the internal source address and internal address Internal packet with destination address Transfer to the previous address,
When the server receives the encapsulated packet addressed to itself, it decapsulates and forwards the packet with the internal source address and the internal destination address to the internal destination address, and sets the internal source address and the external source address. The mobile terminal described as an external destination address corresponding to the address of the mobile terminal by generating an associated binding list and referring to the binding list when transmitting a packet whose destination address is the address of the mobile terminal Encapsulate the terminal RCoA as an external destination address, encapsulate 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, and 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 an 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 that exists between communication paths between the mobile terminal and the server constituting a packet transfer system for transferring a packet transmitted from a mobile terminal to a server,
An encapsulated address list in which the address of the server is described as an internal destination address, an RCoA that is a CoA created in the subnet held by the MAP for the mobile terminal, and a CoA created in a subnet held by the edge router A binding cache that manages a certain LCoA 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;
When a packet transmitted from the mobile terminal to the server is received, the encapsulated address list and binding cache are referred to, the server address is set as an external destination address, and the mobile terminal RCoA is set as an external source address. The encapsulating process unit performs the process to be transferred to the server, and when the encapsulated packet addressed to the RCoA or the LCoA is received, the decapsulation process unit performs the decapsulation process, and the internal source address and An edge router comprising: a determination control unit configured to transfer a packet based on the internal destination address to the internal destination address. A server that receives a packet transmitted from a mobile terminal via 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 its own address;
An encapsulation processor that performs packet encapsulation;
A decapsulation processing unit for decapsulating the packet;
When an encapsulated packet addressed to itself is received, the decapsulation processing unit performs decapsulation processing to transfer a packet based on the internal source address and the internal destination address to the internal destination address, and in the binding list Register an address and an external source address in association with each other, refer to the binding list when transmitting a packet whose destination address is the address of the mobile terminal, and describe it as an external destination address corresponding to the address of the mobile terminal A determination control unit that causes the encapsulation processing unit to perform the process of encapsulating the mobile terminal RCoA as an external destination address and the external source address as its own address, and transferring the result to the MAP. A server characterized by 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 existing between communication paths between the mobile terminal and the server;
The mobile terminal includes an encapsulated 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 encapsulated address list, the address of the front-end processing device described corresponding to the address of the server is used as an external destination address, and its own CoA is encapsulated as an external source address. Forward to the front-end processing device, and when receiving the encapsulated packet addressed to its own CoA, the encapsulation is removed.
When receiving the encapsulated packet addressed to itself, the front-end processing device removes the encapsulation 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. Generating a binding list in which addresses are associated, and upon receiving a packet whose destination address is the address of the mobile terminal, refer to the binding list and described as an external destination address corresponding to the address of the mobile terminal A packet transfer system, wherein a CoA of a mobile terminal is used as an external destination address, and an external source address is encapsulated as its own address and transferred to the mobile terminal. 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,
An information storage unit storing an encapsulated 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 ,
An encapsulation processor that performs packet encapsulation;
A decapsulation processing unit for decapsulating the packet;
Refers to the encapsulated address list when transmitting to the server, sets the address of the front end processing device described in correspondence with the address of the server as an external destination address, and sets its own CoA as an external source Decapsulation that causes the encapsulation processing unit to perform the process of encapsulating as an address, transfers it to the front-end processing device, and receives the encapsulated packet addressed to its own CoA, and then decapsulates the decapsulation processing unit. A mobile terminal comprising: a determination control unit that performs processing. 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 an encapsulated 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 managing RCoA, which is a CoA created in a subnet held by the MAP, and LCoA, which is a CoA created in a subnet in the area, corresponding to the home address and transmitting to the server, Referring to the encapsulated address list, the front end processing device address described in correspondence with the server address is used as an external destination address, and the RCoA of the mobile terminal is encapsulated as an external transmission source address to generate the front end. Transfer to processor and address to RCoA or Remove the encapsulation receives the encapsulated packet addressed to CoA,
When receiving the encapsulated packet addressed to itself, the front-end processing device removes the encapsulation 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. Generating a binding list in which addresses are associated, and upon receiving a packet whose destination address is the address of the mobile terminal, refer to the binding list and described as an external destination address corresponding to the address of the mobile terminal Encapsulating the mobile terminal's RCoA as an external destination address, encapsulating 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, and 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 an external destination address, and its own address Is transferred to the edge router as a packet encapsulated as an external source address. 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,
Created with an encapsulated 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 a subnet held by the MAP about itself An information storage unit that stores a binding cache that manages an RCoA that is a registered CoA and an LCoA that is a CoA created in a subnet that is located in correspondence with a home address;
An encapsulation processor that performs packet encapsulation;
A decapsulation processing unit for decapsulating the packet;
When transmitting to the server, the encapsulated address list is referred to, 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 in the decapsulation processing unit when the encapsulated packet addressed to RCoA or LCoA is received. And a determination control unit that performs decapsulation processing for removing the data. 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 that exist between communication paths between the mobile terminal and the server;
The edge router includes an encapsulated 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. RCoA, which is a CoA created in the subnet held by the network, and an LCoA, which is a CoA created in the subnet held by the edge router, are managed in correspondence with the home address, and transmitted from the mobile terminal to the server When the received packet is received, the encapsulated address list is referred to, the MAP address described corresponding to the server address is used as an external destination address, and the RCoA of the mobile terminal is encapsulated as an external source address. Forward to the MAP, RC Remove the encapsulation receives the encapsulated packet addressed to A addressed or LCoA, 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 an encapsulated packet addressed to itself, the MAP removes the encapsulation and sends the packet based on the internal source address and the internal destination address to the internal destination address. A binding list in which an internal source address and an 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 the address of the mobile terminal When the RCoA of the mobile terminal described as the external destination address corresponding to is used as an external destination address, the packet is transferred as a packet encapsulated with its own address as the external source address, and a packet with the destination address of RCoA is received. Destination address of received packet Packet forwarding system characterized by transferring the LCoA corresponding to a RCoA and an external destination address, to the edge router as encapsulated packet its own address as the external source 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 MAP existing between communication paths between the mobile terminal and the server;
The address of the server is described as the internal destination address, the encapsulated address list in which the address of the MAP corresponding to the address of the server is described as the external destination address, and the subnet held by the MAP for the mobile terminal An information storage unit that stores an RCoA that is a CoA and an LCoA that is a CoA created in a subnet held by the edge router in correspondence with a home address;
An encapsulation processor that performs packet encapsulation;
A decapsulation processing unit for decapsulating the packet;
When a packet transmitted from the mobile terminal to the server is received, the encapsulation address list is referred to, the MAP address described corresponding to the server address is set as an external destination address, and the mobile terminal Encapsulating the RCoA as an external source address in the encapsulation processing unit, transferring it to the MAP, and receiving the encapsulated packet destined for RCoA or LCoA, encapsulating in the decapsulation processing unit An edge router comprising: a determination control unit that performs decapsulation processing to remove the packet and transfers a packet based on the internal source address and the internal destination address to the internal destination address. A MAP configured to transfer a packet transmitted from a mobile terminal to a server and to return a packet transfer system together with an edge router existing between communication paths between the mobile terminal and the server;
A binding cache that manages RCoA and LCoA of the mobile terminal in association with each other, a binding list that associates an internal source address and an external source address, 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 an encapsulated packet addressed to itself is received, the decapsulation processing unit performs decapsulation processing for decapsulation, and forwards a packet based on the internal source address and the internal destination address to the internal destination address, and at the internal source An 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 described as an external destination address corresponding to the address of the mobile terminal When the RCoA of the mobile terminal being used as an external destination address and encapsulating with its own address as an external source address is transferred to the encapsulation processing unit and received, a packet having a destination address of RCoA is received. Packet destination address A determination control unit that encapsulates the LCoA corresponding to a certain RCoA as an external destination address and encapsulates the address as an external transmission source address and causes the encapsulation processing unit to transfer the result to the edge router. Characteristic MAP. A packet transfer system composed of a mobile terminal and a MAP,
The mobile terminal has an encapsulated 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, and the MAP holds the self about the self When the RCoA, which is a CoA created in a subnet, and the LCoA, which is a CoA created in the existing subnet, are managed in correspondence with the home address and transmitted to the server, the encapsulated address list The MAP address described in correspondence with the server address is used as an external destination address, the RCoA of the mobile terminal is encapsulated as an external source address, transferred to the MAP, and sent to the RCoA or LCoA. When receiving an encapsulated packet addressed to Remove the cell of,
When the MAP manages the RCoA and LCoA of the mobile terminal in correspondence with each other and receives an encapsulated packet addressed to itself, the MAP removes the encapsulation and sends the packet based on the internal source address and the internal destination address to the internal destination address. A binding list in which an internal source address and an 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 the address of the mobile terminal When the RCoA of the mobile terminal described as the external destination address corresponding to is used as an external destination address, the packet is transferred as a packet encapsulated with its own address as the external source address, and a packet with the destination address of RCoA is received. Destination address of received packet Packet forwarding system characterized by transferring the LCoA corresponding to a RCoA and an external destination address, to the edge router as encapsulated packet its own address as the external source address. A mobile terminal that performs packet transmission to a server and a reply from the server via a MAP existing between communication paths with the server,
The encapsulated address list in which the address of the server is described as the internal destination address, the address of the MAP corresponding to the address of the server is described as the external destination address, and the CoA created in the subnet held by the MAP about itself An information storage unit that stores a binding cache that manages an RCoA corresponding to a home address and an RCoA that is a CoA created in a subnet that is in the area;
An encapsulation processor that performs packet encapsulation;
A decapsulation processing unit for decapsulating the packet;
When transmitting to the server, the encapsulated address list is referred to, the MAP address described in correspondence with the server address is used as the external destination address, and the RCoA of the mobile terminal is externally transmitted. Decapsulation processing for encapsulating as an original address, causing the encapsulation processing unit to transfer to the MAP and receiving an encapsulated packet destined for RCoA or LCoA. A mobile terminal, comprising: 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 an encapsulated 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 a packet transmitted to the server is received, the encapsulated address list is referred to, the address of the front end processing device described corresponding to the address of the server is set as an external destination address, and its own address is set. Encapsulated as an external source address and transferred to the front-end processing device. When an encapsulated packet addressed to itself is received, the encapsulation is removed, and a packet based on the internal source address and the internal destination address is transferred to the internal destination address. Process,
When receiving the encapsulated packet addressed to itself, the front-end processing device removes the encapsulation 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. Generating a binding list in which addresses are associated, and upon receiving a packet whose destination address is the address of the mobile terminal, refer to the binding list and described as an external destination address corresponding to the address of the mobile terminal A packet transfer method characterized by encapsulating an address of an edge router as an external destination address and an external source address as its own address and transferring it to the edge router. A packet transfer method performed by an edge router configured to transfer a packet transmitted from a mobile terminal to a server and return the packet transfer system together with a front-end processing device existing between communication paths between the mobile terminal and the server Because
An address of the server is described as an internal destination address, and an encapsulated address list in which an address of the front-end processing device corresponding to the address of the server is described as an external destination address is provided from the mobile terminal to the server. When the transmitted packet is received, the encapsulated address list is referred to, the address of the front-end processing device described corresponding to the address of the server is set as an external destination address, and its own address is set as an external source address Encapsulating and transferring to the front-end processing device, receiving an encapsulated packet addressed to itself, removing the encapsulation, and transferring a packet based on an internal source address and an internal destination address to the internal destination address Packet transfer method. A packet transfer method performed by 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 existing between communication paths between the mobile terminal and the server Because
When an encapsulated packet addressed to itself is received, the encapsulation is removed and the packet with the internal source address and the internal destination address is transferred to the internal destination address, and the internal source address and the external source address are associated with each other. A list is generated, and when the packet whose destination address is the address of the mobile terminal is received, the binding list is referred to, and 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. A packet transfer method characterized by encapsulating an external source address as its own address and transferring it to the edge router. 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 an encapsulated 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 encapsulated address list, and Encapsulate server address as external destination address, self address as external source address, transfer to the server, and when encapsulated packet addressed to self is received, decapsulate, internal source address and internal destination Performs processing to forward packets by address to the internal destination address,
When the server receives the encapsulated packet addressed to itself, it decapsulates and forwards the packet with the internal source address and the internal destination address to the internal destination address, and sets the internal source address and the external source address. When the associated binding list is generated and a packet whose destination address is the address of the mobile terminal is transmitted, the binding list is referred to, and the external destination address corresponding to the address of the mobile terminal is described. A packet transfer method comprising: encapsulating an address of an 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. A packet transfer method performed in 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,
An encapsulated address list in which the address of the server is described as an internal destination address is provided. When a packet transmitted from the mobile terminal to the server is received, the encapsulated address list is referred to, and the server address is The destination address is encapsulated as the external source address and transferred to the server. When the encapsulated packet is received, the encapsulation is removed, and the packet with the internal source address and the internal destination address is internal. A packet transfer method comprising transferring to a destination address. A packet transfer method performed by a server that receives a packet transmitted from a mobile terminal via an edge router,
When an encapsulated packet addressed to itself is received, the encapsulation is removed and the packet with the internal source address and the internal destination address is transferred to the internal destination address, and the internal source address and the external source address are associated with each other. A list is generated, and the address of the edge router described as an external destination address corresponding to the address of the mobile terminal is referred to the binding list when a packet whose destination address is the address of the mobile terminal is transmitted. A packet transfer method characterized by encapsulating an external source address as its own address as an external destination address and transferring it to the edge router. 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,
The edge router includes an encapsulated 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, and the mobile terminal 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, are managed in correspondence with the home address, and the mobile terminal sends the server to the server. When the packet transmitted to the server is received, the encapsulated address list is referred to, 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 set as the external address Capse as the source address Is transferred to the front-end processing apparatus, and when an encapsulated packet addressed to RCoA or LCoA is received, decapsulation is performed, and a packet based on the internal source address and internal destination address is transferred to the internal destination address. ,
When receiving the encapsulated packet addressed to itself, the front-end processing device removes the encapsulation 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. Generating a binding list in which addresses are associated, and upon receiving a packet whose destination address is the address of the mobile terminal, refer to the binding list and described as an external destination address corresponding to the address of the mobile terminal Perform processing to encapsulate the RCoA of the mobile terminal as an external destination address, encapsulate 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, and 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 an external destination address, and its own address A packet transfer method, wherein a packet encapsulated as an external source address is transferred to the edge router. Packets performed by an edge router configured to transfer a packet transmitted from a mobile terminal to a server and send back 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 A transfer method,
An address of the server is described as an internal destination address, and an encapsulated 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 is provided. RCoA, which is a CoA created in the subnet to be managed, and LCoA, which is a CoA created in the subnet held by the edge router, are managed in correspondence with the home address and transmitted from the mobile terminal to the server When a packet is received, the encapsulated address list is referred to, the address of the front-end processing device described corresponding to 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 Turn the front Packet transfer, wherein the packet is decapsulated when an encapsulated packet addressed to RCoA or LCoA is received, and the packet based on the internal source address and internal destination address is transferred to the internal destination address. Method. It is performed by a front-end processing device that constitutes a packet transfer system for transferring and returning a packet transmitted from a mobile terminal to a server together with an edge router and a MAP existing between communication paths between the mobile terminal and the server. A packet forwarding method,
When an encapsulated packet addressed to itself is received, the encapsulation is removed and the packet with the internal source address and the internal destination address is transferred to the internal destination address, and the internal source address and the external source address are associated with each other. When the list is generated and a packet whose destination address is the address of the mobile terminal is received, the binding list is referred to, and 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. A packet transfer method characterized by encapsulating an external source address as its own address and transferring it to the MAP. Packets performed by a MAP 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 front-end processing device existing between communication paths between the mobile terminal and the server A transfer method,
When the RCoA and LCoA of the mobile terminal are managed in correspondence and 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 externally transmitted. A packet transfer method, wherein the packet is transferred to the edge router as a packet encapsulated as an original address. 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 has an encapsulated address list in which the address of the server is described as an internal destination address, and the RCoA that is a CoA created in the subnet held by the MAP for the mobile terminal and the edge router holds LCoA, which is a CoA created in the subnet, is managed in correspondence with a home address, and when a packet transmitted from the mobile terminal to the server is received, the encapsulated address list is referred to, and the address of the server is determined. The external destination address is encapsulated, and the RCoA of the mobile terminal is encapsulated as an external source address and transferred to the server. When an encapsulated packet destined for RCoA or LCoA is received, the encapsulation is removed, and the internal source address and internal address Internal packet with destination address It performs the processing to be transferred to the destination address,
When the server receives the encapsulated packet addressed to itself, it decapsulates and forwards the packet with the internal source address and the internal destination address to the internal destination address, and sets the internal source address and the external source address. The mobile terminal described as an external destination address corresponding to the address of the mobile terminal by generating an associated binding list and referring to the binding list when transmitting a packet whose destination address is the address of the mobile terminal The terminal RCoA 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 in association with each other, and 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 an external destination address, and its own address A packet transfer method, wherein a packet encapsulated as an external source address is transferred to the edge router. A packet transfer method performed in 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,
An encapsulated address list in which the address of the server is described as an internal destination address is provided, and the RCoA, which is a CoA created in the subnet held by the MAP for the mobile terminal, and the subnet held by the edge router LCoA that is a CoA is managed in correspondence with a home address, and when a packet transmitted from the mobile terminal to the server is received, the encapsulated address list is referred to, and the server address is set as an external destination address. The RCoA of the mobile terminal is encapsulated as an external source address and transferred to the server. When an encapsulated packet destined for RCoA or LCoA is received, the encapsulation is removed, and a packet with an internal source address and an internal destination address is received. Forward to internal destination address Packet transfer method, characterized in that. A packet transfer method performed by a server that receives a packet transmitted from a mobile terminal via an edge router,
When an encapsulated packet addressed to itself is received, the encapsulation is removed and the packet with the internal source address and the internal destination address is transferred to the internal destination address, and the internal source address is associated with the external source address. A list is generated and the RCoA of the mobile terminal described as the external destination address corresponding to the address of the mobile terminal is referred to the binding list when transmitting a packet whose destination address is the address of the mobile terminal. A packet transfer method characterized by encapsulating an external source address as its own address and transferring it to the MAP as an external destination address. 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 an encapsulated 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 encapsulated address list, the address of the front-end processing device described corresponding to the address of the server is used as an external destination address, and its own CoA is encapsulated as an external source address. Forward to the front-end processing device, and when receiving the encapsulated packet addressed to its own CoA, perform the process of removing the encapsulation
When receiving the encapsulated packet addressed to itself, the front-end processing device removes the encapsulation 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. Generating a binding list in which addresses are associated, and upon receiving a packet whose destination address is the address of the mobile terminal, refer to the binding list and described as an external destination address corresponding to the address of the mobile terminal A packet transfer method comprising: encapsulating a mobile terminal's CoA as an external destination address and an external source address as its own address and transferring the result to the mobile terminal. A packet transfer method performed by 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,
When an address of the server is described as an internal destination address and an encapsulated 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 is transmitted to the server Referring to the encapsulated address list, the front-end processing is performed by encapsulating the address of the front-end processing device described corresponding to the address of the server as an external destination address and the own CoA as an external source address. A packet transfer method, wherein transfer is performed to a device and decapsulation is removed when an encapsulated packet addressed to its own CoA is received. A packet transfer method performed in a packet transfer system in which a front-end processing device and a MAP exist between communication paths between a mobile terminal and a server,
The mobile terminal includes an encapsulated 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 managing RCoA, which is a CoA created in a subnet held by the MAP, and LCoA, which is a CoA created in a subnet in the area, corresponding to the home address and transmitting to the server, Referring to the encapsulated address list, the front end processing device address described in correspondence with the server address is used as an external destination address, and the RCoA of the mobile terminal is encapsulated as an external transmission source address to generate the front end. Transfer to processor and address to RCoA or It performs processing for removing the encapsulation receives the encapsulated packet addressed to CoA,
When receiving the encapsulated packet addressed to itself, the front-end processing device removes the encapsulation 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. Generating a binding list in which addresses are associated, and upon receiving a packet whose destination address is the address of the mobile terminal, refer to the binding list and described as an external destination address corresponding to the address of the mobile terminal Perform processing to encapsulate the RCoA of the mobile terminal as an external destination address, encapsulate 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, and 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 an external destination address, and its own address A packet transfer method, wherein a packet encapsulated as an external source address is transferred to the edge router. A packet transfer method performed by 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 in a communication path with the server,
An address of the server is described as an internal destination address, and an encapsulated 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 is provided. When the RCoA, which is the CoA created in step 1, and the LCoA, which is the CoA created in the existing subnet, are managed corresponding to the home address and transmitted to the server, the encapsulated address list is The address of the front-end processing device described corresponding to the address of the server 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. , RCoA or LCoA Packet transfer method characterized by removing the encapsulation receives the Le packets. 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 an encapsulated 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. RCoA, which is a CoA created in the subnet held by the network, and an LCoA, which is a CoA created in the subnet held by the edge router, are managed in correspondence with the home address, and transmitted from the mobile terminal to the server When the received packet is received, the encapsulated address list is referred to, the MAP address described corresponding to the server address is used as an external destination address, and the RCoA of the mobile terminal is encapsulated as an external source address. Forward to the MAP, RC Remove the encapsulation receives the encapsulated packet addressed to A addressed or LCoA, performs processing of transferring 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 an encapsulated packet addressed to itself, the MAP removes the encapsulation and sends the packet based on the internal source address and the internal destination address to the internal destination address. A binding list in which an internal source address and an 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 the address of the mobile terminal When the RCoA of the mobile terminal described as the external destination address corresponding to is used as an external destination address, the packet is transferred as a packet encapsulated with its own address as the external source address, and a packet with the destination address of RCoA is received. Destination address of received packet The LCoA corresponding to a RCoA and an external destination address, the packet transfer method characterized by performing the process of transferring its own address to the edge router as the encapsulated packet as the external source address. A packet transfer method performed by an edge router configured to transfer a packet transmitted from a mobile terminal to a server and return the packet transfer system together with a MAP existing between communication paths between the mobile terminal and the server. ,
The edge router includes an encapsulated 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. RCoA, which is a CoA created in the subnet held by the network, and an LCoA, which is a CoA created in the subnet held by the edge router, are managed in correspondence with the home address, and transmitted from the mobile terminal to the server When the received packet is received, the encapsulated address list is referred to, the MAP address described corresponding to the server address is used as an external destination address, and the RCoA of the mobile terminal is encapsulated as an external source address. Forward to the MAP, RC Remove the encapsulation receives the encapsulated packet addressed to A addressed or LCoA, packet transfer method characterized by transferring the packet according to the internal source address and the internal destination address to an internal destination address. A packet transfer method performed by 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 existing between communication paths between the mobile terminal and the server. ,
When the RCoA and the LCoA of the mobile terminal are managed correspondingly and an encapsulated packet addressed to the mobile terminal is received, the encapsulation is removed and the packet based on the internal source address and the 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 with each other 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 an external corresponding to the address of the mobile terminal When the RCoA of the mobile terminal described as the destination address is set as the external destination address, the packet is transferred as the packet encapsulated with the self address as the external source address, and when the packet having the destination address of RCoA is received, RCoA that is the destination address Corresponding to an external destination address LCoA, packet transfer method characterized by transferring to the edge router as encapsulated packet its own address as the external source address. A packet transfer method performed in a packet transfer system including a mobile terminal and a MAP,
The mobile terminal has an encapsulated 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, and the MAP holds the self about the self When the RCoA, which is a CoA created in a subnet, and the LCoA, which is a CoA created in the existing subnet, are managed in correspondence with the home address and transmitted to the server, the encapsulated address list The MAP address described in correspondence with the server address is used as an external destination address, the RCoA of the mobile terminal is encapsulated as an external source address, transferred to the MAP, and sent to the RCoA or LCoA. When receiving an encapsulated packet addressed to It performs a process of removing the cell of,
When the MAP manages the RCoA and LCoA of the mobile terminal in correspondence with each other and receives an encapsulated packet addressed to itself, the MAP removes the encapsulation and sends the packet based on the internal source address and the internal destination address to the internal destination address. A binding list in which an internal source address and an 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 the address of the mobile terminal When the RCoA of the mobile terminal described as the external destination address corresponding to is used as an external destination address, the packet is transferred as a packet encapsulated with its own address as the external source address, and a packet with the destination address of RCoA is received. Destination address of received packet The LCoA corresponding to a RCoA and an external destination address, the packet transfer method characterized by performing the process of transferring its own address to the edge router as the encapsulated packet as the external source address. A packet transfer method performed by a mobile terminal that performs packet transmission to a server and a reply from the server via a MAP existing between communication paths with the server,
The address of the server is described as an internal destination address, and the MAP address corresponding to the address of the server has an encapsulated address list described as an external destination address, and is created in a subnet held by the MAP about itself RCoA, which is a CoA, and LCoA, which is a CoA created in a subnet that is located, are managed in correspondence with home addresses, and when transmitting to the server, refer to the encapsulated address list, The MAP address described in correspondence with the server address is used as an external destination address, the RCoA of the mobile terminal is encapsulated as an external source address, transferred to the MAP, and encapsulated for RCoA or LCoA When the received packet is received Packet transfer method, characterized in that. 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. A recording medium in which the program according to claim 45 is stored.

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