JP5655018B2 - Handover processing system and gateway router - Google Patents

Description

  The present invention relates to a technique in which a user terminal performs handover while maintaining communication between different ISPs and networks.

  In considering a future network, it is important to realize a seamless handover in which communication continues even if a user connects a terminal to any network. This is because the future network is expected to become a heterogeneous environment in which different types of networks are switched over due to the tight resource of wireless communication. In this case, seamless handover is desirable beyond the framework of ISP (Internet service provider) and carrier. For example, hand over to WiMAX while using 3G of a mobile communication carrier, and hand over to free WiFi provided by a hotel.

  In order to realize seamless handover across ISPs, it is necessary to provide mobility across ISPs using Mobile IP or the like. As typical mobility technologies, Mobile IPv6 (Non-Patent Document 1) and PMIPv6 (Non-Patent Document 2) are representative of conventional technologies. Mobile IPv6 realizes mobility by converting a home address and a care-of address using Home Agent (HA) as an anchor point. The care-of address update process for the HA is based on the concept of terminal initiative. PMIPv6 has a mobility function on the network side, whereas Mobile IPv6 performs terminal-led control. LMA is defined as an anchor point, and a tunnel is established with MAG. Although the MAG changes with the movement of the terminal, the mobility management in the NW is realized by replacing the tunnel to the LMA. In PMIPv6, since it is necessary to establish a tunnel to the LMA serving as an anchor point, traffic is concentrated, and in order to accommodate a large number of users, management of the tunnel is necessary, and there is a problem in scalability.

  Under such circumstances, recently, LISP (Locator / ID Separation Protocol) (Non-patent Document 3) in which Locator / ID is separated has attracted attention. In the routing by the current IP address, one IP address indicates two meanings of the terminal ID and the location where the terminal exists, but the LISP indicates the ID assigned to the terminal and the location (site) where the terminal exists. This is a technology that realizes seamless communication between a terminal and a site by separating a Locator and appropriately setting the correspondence between the two. LISP was originally devised as a method for dealing with an increase in the routing table in the current network. However, attention is focused on the possibility of LISP, and its use for mobility is being studied. In IETF, a draft is being created in a LISP-MN (Mobile Node) (Non-Patent Document 4), and regulations regarding handover using LISP are being advanced. Considering the use of this LISP for handover between ISPs, there is a possibility that a mobility function can be provided without traffic being concentrated on anchor points in a stateless manner as compared with a method of establishing a tunnel.

  As described above, the LISP-MN has been studied to use the LISP for mobility. However, as a problem of the LISP-MN, updating the Locator may be performed from the terminal side to the map server. The terminal needs to know the destination of the map server in the LISP network in advance, and it is necessary to implement a mobility function on the terminal side, such as registration and deletion procedures in the map server. When the mobility function is controlled on the terminal side, it is inconvenient because it is necessary to change the terminal side when the implementation on the network side is expanded or a specification change occurs. Even when an NW is accommodated, it is necessary to implement all controls on the existing terminals of the NW. For this reason, it is a challenge to provide the mobility function on the network side as much as possible.

  For network-based mobility management using LIPS, it has been proposed to manage mobility by defining a unique ID called Mobile ID. (Non-Patent Document 5)

"Mobility Support in IPv6," RFC 3775, http://tools.ietf.org/html/rfc3775 (searched November 30, 2011) "Proxy Mobile IP v6," RFC 5213, http://tools.ietf.org/html/rfc5213 (searched November 30, 2011) "Locator / ID Separation Protocol (LISP)," IETF draft, http://tools.ietf.org/html/draft-ietf-lisp-16 (searched November 30, 2011) "LISP Mobile Node," IETF draft, http://tools.ietf.org/html/draft-meyer-lisp-mn-06 (searched November 30, 2011) Ping Dong, Jia Chen, and Hongke Zhang, "A network-based localized mobility approach for Locator / ID separation protocol", IEICE TANS. COMMUN., Vol.E94-B, No.6, June 2011

  Although the concept of controlling the LISP on the network side is shown by Non-Patent Document 5, there is no clear method for implementing a handover between ISPs in the actual Internet, which is a problem.

  In particular, the method of Non-Patent Document 5 has a problem that it is necessary to mount it on a terminal having a unique Mobile ID. In addition, when applied to handover between ISPs, in an actual ISP, terminals that use mobility are mixed with terminals that are not used, and coexistence is a problem. When Mobile ID is used, coexistence with the terminal of the connection method by the conventional IP becomes a problem. Also from the viewpoint of the terminal, there are ISPs of both the connection method using Mobile ID and the conventional connection method, and it is necessary to switch the connection in consideration of the system, which is a problem.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a technique for realizing a handover in which a user terminal crosses between different types of NWs or ISPs using LISP.

In order to solve the above problems, the present invention provides a plurality of gateways including first and second gateway routers having a data transfer function for separating terminal ID and site information and performing routing based on the site information. A router,
A handover processing system comprising: a map server that stores mapping information in which terminal IDs and site information are associated with each other;
When the user terminal is connected to the first network connected to the first gateway router by the first communication interface, the first gateway router acquires the terminal ID of the user terminal, and An inquiry is made by sending the terminal ID to the map server,
The map server notifies the first gateway router of the IP address corresponding to the terminal ID, and mapping information in which the terminal ID is associated with the first gateway router as first transfer destination site information To the plurality of gateway routers,
The first gateway router enables IP communication by the first communication interface of the user terminal by notifying the user terminal of the IP address,
When the user terminal is connected to the second network connected to the second gateway router by the second communication interface, the second gateway router acquires the terminal ID of the user terminal, An inquiry is made by sending the terminal ID to the map server,
The map server notifies the second gateway router of the IP address, and updates mapping information in which the terminal ID is associated with the second gateway router as second transfer destination site information. Notify multiple gateway routers,
The second gateway router enables IP communication by the second communication interface of the user terminal by notifying the user terminal of the IP address ,
When the first gateway router receives data addressed to the IP address of the user terminal from the Internet, the data is transferred to the second gateway router based on the second transfer destination site information in the update mapping information. It is forwarded to the configured as a handover processing system according to claim.

  The mapping information stored in the map server includes contract information for each site for each terminal ID, and when the user terminal is connected, the first gateway router refers to the mapping information already held. To determine whether or not the user terminal uses the mobility function. When it is determined that the user terminal is to be used, an inquiry is made to the map server. Internet connection without using the transfer function may be performed.

  When the map server receives an inquiry from the second gateway router, the map server determines whether or not to use the second gateway router as a transfer destination based on a predetermined priority between the communication interfaces of the user terminals. It may be determined.

The present invention also provides a gateway router having a data transfer function for separating terminal ID and site information and performing routing based on site information, and a map storing mapping information in which terminal ID and site information are associated with each other A gateway router in a handover processing system comprising a server,
When a user terminal connects to a network connected to the gateway router, the terminal obtains the terminal ID of the user terminal, sends an inquiry by sending the terminal ID to the map server, and receives an IP address from the map server Means for notifying the user terminal of the IP address;
When the user terminal connects to a network connected to another gateway router , mapping information is updated in the map server, and the terminal ID corresponds to the other gateway router as transfer destination site information. Means for receiving the update mapping information from the map server when the attached update mapping information is transmitted from the map server to the gateway router and the other gateway router ;
When receiving the data of the IP address of the user terminal from the Internet, based on the transfer destination site information in the update mapping information, and characterized in that it comprises means for transferring the data to the other gateway routers It may be configured as a gateway router.

  Advantageous Effects of Invention According to the present invention, it is possible to provide a technique for realizing a handover in which a user terminal straddles between different types of NWs or ISPs using LISP.

  That is, according to the present invention, it is possible to process the mobility update accompanying the movement of the terminal by the network side device while taking advantage of the advantage that is not the intensive routing management at a specific anchor point that is a feature of the LISP, It is possible to realize a mechanism that allows user communication to continue seamlessly across different NWs and ISPs. Further, the terminal can be realized on the basis of an IP address without using a special Mobile ID.

It is a system configuration figure in an embodiment of the invention. It is a functional block diagram of a gateway router. It is a functional block diagram of a map server. It is a figure which shows the management table in a map server. It is a sequence diagram which shows operation | movement of the system at the time of a hand-over. It is a flowchart which shows the operation | movement at the time of connection of a gateway router. It is a flowchart which shows operation | movement at the time of the cutting | disconnection of a gateway router. It is a figure which shows the example of the flow of the traffic at the time of a hand-over. It is a figure which shows the example of application to a single ISP.

  Embodiments of the present invention will be described below with reference to the drawings. The embodiment described below is only an example, and the embodiment to which the present invention is applied is not limited to the following embodiment.

<Outline of the embodiment>
The technique according to the present embodiment is a specific method for realizing inter-ISP handover from the network side in LISP.

  That is, a device such as a gateway router installed in each ISP has the following functions in addition to a normal LISP TR (Tunnel Router) function: (1) Determination of whether a terminal uses a mobility function; (2) Registration / deletion in map server; (3) Notification of IP address to terminal.

  For example, the terminal is assumed to perform authentication when connecting to each ISP. At the time of the authentication, the gateway router specifies the terminal (or user contract) ID. The gateway router determines whether or not the corresponding terminal uses the mobility function from the previously stored terminal ID and contract information database. If the terminal does not use the mobility function, the Internet connection is provided as it is. If the terminal uses a mobility function, an IP address is assigned if necessary, and transmission / reception packets related to this terminal are routed using TR.

  When assigning an IP address to a terminal, the gateway router takes a correspondence between the terminal ID and the IP address of the terminal with the map server in the network of the Locator / ID separation system configured by LISP, The IP address is notified to the terminal. This IP address is an address associated with a terminal ID, and the same IP address is used even for different interfaces with the same terminal ID. The map server manages the correspondence between the terminal ID and the IP address, issues an IP address, determines which of the connections with a plurality of active gateway routers is used preferentially, and each gateway router Notify the mapping information. The IP address to be paid out to the terminal is determined in advance by discussion with the ISP from the IP address space managed by each ISP, and stored and managed.

  When the terminal is connected to the network through each interface, the same IP address is automatically assigned, and the network side transfers the communication data to the IP address after the handover, so that the handover can be realized while continuing the communication. In addition, the IP address changes when the connected ISP cannot provide mobility, but the terminal is realized by a normal connection procedure and does not need to be aware of the switching of the operation.

<System configuration>
Hereinafter, this embodiment will be described in more detail. First, FIG. 1 shows a system configuration example of the present embodiment.

  As shown in FIG. 1, in the system according to the present embodiment, ISP1 (114) and ISP2 (115) that provide a connection to the Internet 117 are respectively referred to as gateway routers 101 (also referred to as GW1) and 118 (also referred to as GW2). ) Is installed. Each of the gateway routers 101 and 118 has a normal LISP TR (Tunnel Router) function. The gateway routers 101 and 118 have functions according to the present invention described later.

  ISP1 (114) and ISP2 (115) are connected to network 104 (NW1) and network (NW2), respectively, and user terminal 106 (denoted as “UE” in the figure) has a plurality of interfaces 105 corresponding to each ISP / NW. (IF1) and 107 (IF2). Here, two cases will be described as an example, but this number is not limited. The user terminal 106 communicates with the ISPs 1 and 2 through the gateways 108 and 112 of the NW 1 and 2 from the corresponding interface.

  As connection between ISP1 (114) and ISP2 (115), IX116 (Internet eXchange) is used, LISP network 103 is constructed between gateway router 101 and gateway router 118, and map server 102 is installed in the network. To do. In the present embodiment, in such a network configuration, a situation is assumed in which the user terminal 106 is handed over from, for example, ISP1 (114) to ISP2 (115) using the respective communication IF1, IF2 (105, 107). To do.

  The devices having the functions according to the present invention are the gateway routers 101 and 118 and the map server 102 placed in each ISP. Hereinafter, functional configurations of these apparatuses will be described.

  FIG. 2 shows a functional configuration of the gateway router 101. Since the gateway router 118 has the same configuration, the gateway router 101 will be described here as a representative.

  As shown in FIG. 2, the gateway router 101 includes a terminal ID determination function unit 201, a mapping information storage function unit 203, an IP address acquisition function unit 204, an IP address notification function unit 205, a LISP-TR function unit 206, an Internet connection function. The unit 202 is provided. The functional configuration shown in FIG. 2 shows the main functions related to the present embodiment, and actually includes an existing function (not shown) for realizing an operation as a router. The mapping information storage function unit 203 includes storage means for storing a mapping table transmitted from the map server 102. The operation of each functional unit will be described later in the explanation of the operation.

  The gateway router 101 can be realized by causing a router including a computer including a CPU, a memory, and the like to execute a program corresponding to the processing described in this embodiment. That is, the function of each unit of the gateway router 101 executes a program corresponding to the processing executed in each unit using hardware resources such as a CPU and a memory built in the computer constituting the gateway router 101. Can be realized. In addition, the program can be recorded on a computer-readable recording medium and stored or distributed. It is also possible to provide the program through a network such as the Internet or electronic mail. The processing described in this embodiment can also be realized by a hardware circuit.

  FIG. 3 shows a functional configuration of the map server 102. The map server 102 includes a terminal ID determination function unit 301, a mapping information storage function unit 303, a priority order calculation function unit 304, an IP address notification function unit 302, and a mapping information notification function unit 305. The functional configuration shown in FIG. 3 shows the main functions related to the present embodiment, and actually includes existing functions (not shown) for realizing the operation as a server.

  The mapping information storage function unit 303 includes storage means for storing a mapping table. An example of the mapping table is shown in FIG. The operation of each functional unit and the contents of the mapping table will be described in the following operation description.

  The map server 102 can be realized by causing a computer including a CPU, a memory, a communication interface, and the like to execute a program corresponding to the processing described in the present embodiment. That is, the function of each unit of the map server 102 executes a program corresponding to the process executed by each unit using hardware resources such as a CPU and a memory built in the computer constituting the map server 102. Can be realized. In addition, the program can be recorded on a computer-readable recording medium and stored or distributed. It is also possible to provide the program through a network such as the Internet or electronic mail.

<System operation>
Next, a handover operation procedure according to the present embodiment will be described with reference to the sequence diagram of FIG.

  It is assumed that the user terminal 106 has two different communication interfaces (IF1, IF2) and has contracted communication for Internet connection with each ISP through the respective communication interfaces.

  First, the user terminal 106 connects to NW1 (104) using IF1 (105) (step S11). After establishing a physical route with NW1, it connects to ISP1 (114) to communicate with the Internet, and receives authentication and IP address payout (steps S12 to S15). Below, operation | movement of step S12-step S15 is demonstrated in detail. Here, FIG. 6 is a flowchart showing the processing operation at the time of terminal connection in the gateway router 101. For the operation of the gateway router 101 in the following processing operations, the step numbers in the flowchart of FIG. 6 are referred to as appropriate.

  The gateway router 101 receives a connection from the user terminal 106 (step S501 in FIG. 6). At this time, the terminal ID of the user terminal 106 is notified from the user terminal 106 via the GW 108 of NW1 (104) (step S12 in FIG. 5), and the gateway router 101 performs authentication (step S502 in FIG. 6). .

  In step S502, the terminal ID determination function unit 201 acquires the terminal ID of the user terminal 106, refers to the mapping table already held in the mapping information storage function unit 203, and registers the acquired terminal ID and the mapping table. The terminal ID being checked is checked. This mapping table is received from the map server 102 and includes contract information.

  The terminal ID is an ID that can uniquely identify the terminal. For example, an IMSI in a SIM card used in a 3G mobile phone, a hardware IMEI, a serial number, or a MAC address can be used. Alternatively, a fixedly assigned IP address may be used. As a means for notifying the terminal ID, for example, there is a means for extending a DHCP frame for obtaining an IP address.

  When the terminal ID determination function unit 201 determines that there is no entry of the terminal ID on the mapping table or that the mobility is not necessary based on the contract information (No in step S503 in FIG. 6), the Internet connection function unit 202 As is, the IP address for Internet connection is notified based on the procedure of the relevant ISP, and the user terminal 106 is permitted to access the Internet (step S506 in FIG. 6).

  If it is determined that the user terminal 106 is a terminal that needs mobility by checking the terminal ID and the entry on the mapping table (Yes in step S503), the IP address acquisition function unit 204 knows in advance The map server 102 is notified of the terminal ID and inquired and registered (step S504 in FIG. 6 and step S13 in FIG. 5).

  In the map server 102 that has received the inquiry including the terminal ID, the terminal ID determination function unit 301 refers to the mapping table stored in the mapping information storage function unit 303 and determines the IP address for the terminal ID.

  An example of the mapping table according to the present embodiment is shown in FIG. As shown in FIG. 4, the mapping table stores the terminal ID 401, the IP address 402, the current GW 403 indicating the ISP of the current routing destination, and the status 404 of each ISP of the terminal.

  In the present embodiment, there are three types of values of ISP status 404: active, disable, and N / A. active indicates that there is a contract to use the mobility function in the corresponding ISP and communication is possible at this time, disable indicates that there is a contract but communication is not possible at this time, and N / A has no contract It shows that. For example, when a user terminal makes a mobility contract with an ISP, disable is recorded in the value of the ISP column for the user terminal, and active is recorded when the IP address is issued. The GW 403 that is the current routing destination can be determined from the inquiry source and is recorded.

  The above IP address uniquely corresponds to the terminal ID. The IP address assignment in the map server 102 is performed by selecting one of the IP address stocks prepared in advance and stored in the storage means when the terminal is connected through the first IF. The same IP address is assigned when the terminal is handed over. However, if there is no connection in any IF for a certain period, another IP address may be selected again at the time of connection. Further, the same IP address may always be selected for terminals having the same terminal ID.

  The IP address notification function unit 302 of the map server 102 returns the determined IP address to the gateway router 101 (step S14 in FIG. 5) and updates the mapping table of the mapping information storage function unit 303. The information updated here is, for example, the IP address for the corresponding terminal ID, the current GW, and the state (disable → able). The updated mapping table is notified from the mapping information notification function unit 305 to all gateway routers of each ISP (steps S16 and S17 in FIG. 5).

  In the gateway router 101 that has received the notification, the mapping information storage function unit 203 updates the mapping table. Here, the information notified to the gateway router of each ISP includes at least the terminal ID 401, the IP address 402, and the current GW 403 as the transfer destination shown in FIG.

Further, the gateway router 101 notifies the acquired IP address through the IF1 of the corresponding user terminal 106 by the IP address notification function unit 205 (step S15).
Through the above processing, the gateway router 101 starts routing by the TR function by the LISP TR function unit 206 (step S505 in FIG. 6), and the user terminal 106 can access the Internet through the corresponding ISP 1 (step in FIG. 5). S18, S19, S20, S21).

  Next, it is assumed that the user terminal 106 performs connection by IF2 (107) in addition to communication by IF1 (105) due to movement, environment change, and the like. That is, similarly to the connection using IF1 (105), the user terminal 106 connects to ISP2 (107) using IF2 (107) (steps S22 and S23).

  The gateway router 118 makes an inquiry by notifying the map server 102 of the terminal ID (step S24) and receives an IP address (step S25). The map server 102 updates the mapping table (FIG. 4) for the IF2 (107) of the user terminal 106 being connected and activated. The IP address is notified from the gateway router 118 to the user terminal 106 (step S26). Thereby, the user terminal 106 can perform communication using the IP address by IF2.

  The priority calculation function unit 304 of the map server 102 determines whether the GW 403 indicating the current transfer destination is changed from the GW 1 (101) to the GW 2 (118). As a method of assigning priorities, for example, priorities can be assigned based on the communication speed of a terminal or a charge. However, it is not limited.

  For example, the priority calculation function unit 304 recognizes the maximum speed according to the standard of the interface of the terminal as the function for prioritizing the interface to be used among a plurality of active interfaces of the terminal. (2) A function that prioritizes the cheapest interface / interface group, (3) A function that prioritizes the cheapest interface / interface group, and (3) A function that prioritizes the least expensive interface / interface group. One or more of a function for selecting a power interface / interface group and (4) a function for comparing the effective speeds of the interfaces of the terminal and selecting the fastest interface / interface group are provided.

  In addition, each gateway router measures the current load status (CPU load) of the gateway router, notifies the map server 102, and the map server 102 makes a transfer destination switching determination based on the notified load status. May be provided. Further, each gateway router may measure or collect the load status of the lower network, and notify the map server 102, and the map server 102 may have a function of making a transfer destination switching determination based on the load status.

  When switching the forwarding destination to GW2 as the determination by the priority calculation function unit 304, the current GW403 in the mapping table is updated to GW2, and the updated mapping table is notified to each gateway router (steps S27 and S28).

  Thereafter, when the gateway router 101 (GW1) of the ISP 1 receives a packet addressed to the IP address of the corresponding user terminal 106 from the Internet 117 (step S29 in FIG. 5), the updated transfer destination information (current GW: GW2) ) To the TR (GW2) of the destination ISP2 using the normal LISP TR function (step S30). The gateway router 118 of the destination ISP 2 delivers the packet to the IF 2 of the corresponding user terminal 106 through the NW 2 (Step S31). Further, the packet for the Internet 117 transmitted from the IF2 of the user terminal 106 is transmitted to the Internet 117 by the gateway router 118 of the ISP2 (Steps S32 and S33).

  With the above procedure, handover is realized between different ISPs from NW1 (104) to NW2 (111).

  FIG. 7 shows the operation of the gateway router when the user terminal 106 is disconnected from the network. As shown in FIG. 7, when the gateway router serving as the transfer destination of the user terminal 106 detects terminal disconnection (step S601), it requests the map server 102 to delete registration (step S602). Thereby, in the map server 102, the IP address assigned to the user terminal 106 is deleted from the map server and active is disabled.

<Traffic flow>
FIG. 8 shows the traffic flow before and after the handover. As shown in FIG. 8, before the handover, the user terminal 106 transmits / receives to / from the Internet 117 through the IF 1 through the NW 1 as in the flow shown in F11. After the handover to NW2, NW2 is used to transmit / receive to / from the Internet 117 as shown in F13. Since the ISP 1 was used before the handover, the packet that arrives there is transferred to the NW 2 side based on the LISP procedure. That is, the transfer is performed based on GW2, which is transfer destination information described in the mapping table of the gateway router 101. This transfer destination information is a locator, which is information indicating a site that is a place on the IP network, and can be referred to as site information.

  The above transfer path is indicated by F12. Thus, it is possible to deliver a packet received by each ISP to the same user terminal, which is an advantage of network construction by LISP.

  Further, the technique according to the present embodiment can be used in the same manner when there are a plurality of communication points within the single ISP, in addition to the case where the ISP spans a plurality of ISPs as in the above example. FIG. 9 shows a configuration diagram in that case. 114 indicates the ISP, and the gateway router 101 and the map server 102 according to the present embodiment are arranged therein and the same processing is performed, so that seamless handover across different NWs can be realized within the same ISP. It is.

<Summary of Embodiments and Effects>
In the present embodiment, the gateway router of each ISP recognizes the terminal ID and registers and deletes it in the map server in the LISP NW. It is possible to realize mobility control on the network side by managing the network and updating the mapping table.

  Conventionally, in LISP, if a handover between ISPs is to be realized while continuing communication, the mapping of the map server is updated from the LISP terminal. However, the implementation is a terminal-initiated handover and a switching process is performed on the terminal side. However, according to the technique of the present embodiment, it is possible to provide a mobility control function on the network side and reduce terminal implementation.

  That is, according to the present embodiment, it is possible to process the mobility update accompanying the movement of the terminal by the network side device while taking advantage of the advantage that is not the centralized routing management at the specific anchor point that is the feature of the LISP. In addition, it is possible to realize a mechanism that allows user communication to continue seamlessly across different NWs and ISPs. Further, the terminal can be realized on the basis of an IP address without using a special Mobile ID.

  The present invention is not limited to the above-described embodiments, and various modifications and applications are possible within the scope of the claims.

101, 118 Gateway router 102 Map server 103 LISP network 104, 111 Network 105, 107 Interface 106 User terminal 117 Internet

Claims (4)

A plurality of gateway routers including first and second gateway routers having a data transfer function for separating terminal ID and site information and performing routing based on the site information;
A handover processing system comprising: a map server that stores mapping information in which terminal IDs and site information are associated with each other;
When the user terminal is connected to the first network connected to the first gateway router by the first communication interface, the first gateway router acquires the terminal ID of the user terminal, and An inquiry is made by sending the terminal ID to the map server,
The map server notifies the first gateway router of the IP address corresponding to the terminal ID, and mapping information in which the terminal ID is associated with the first gateway router as first transfer destination site information To the plurality of gateway routers,
The first gateway router enables IP communication by the first communication interface of the user terminal by notifying the user terminal of the IP address,
When the user terminal is connected to the second network connected to the second gateway router by the second communication interface, the second gateway router acquires the terminal ID of the user terminal, An inquiry is made by sending the terminal ID to the map server,
The map server notifies the second gateway router of the IP address, and updates mapping information in which the terminal ID is associated with the second gateway router as second transfer destination site information. Notify multiple gateway routers,
The second gateway router enables IP communication by the second communication interface of the user terminal by notifying the user terminal of the IP address ,
When the first gateway router receives data addressed to the IP address of the user terminal from the Internet, the data is transferred to the second gateway router based on the second transfer destination site information in the update mapping information. handover processing system, characterized in that the transfer. The mapping information stored in the map server includes contract information for each site for each terminal ID,
When the user terminal is connected, the first gateway router determines whether or not the user terminal uses the mobility function by referring to the mapping information already held. 2. The handover processing system according to claim 1, wherein when the inquiry to the map server is made and it is determined not to be used, the user terminal is connected to the Internet without using the data transfer function. . When the map server receives an inquiry from the second gateway router, the map server determines whether or not to use the second gateway router as a transfer destination based on a predetermined priority between the communication interfaces of the user terminals. The handover processing system according to claim 1, wherein the handover processing system is determined. Handover processing comprising a gateway router having a data transfer function for separating terminal ID and site information and performing routing based on site information, and a map server storing mapping information in which terminal ID and site information are associated with each other Said gateway router in the system,
When a user terminal connects to a network connected to the gateway router, the terminal obtains the terminal ID of the user terminal, sends an inquiry to the map server, and sends an IP address from the map server. Means for notifying the user terminal of the IP address;
When the user terminal connects to a network connected to another gateway router , mapping information is updated in the map server, and the terminal ID corresponds to the other gateway router as transfer destination site information. Means for receiving the update mapping information from the map server when the attached update mapping information is transmitted from the map server to the gateway router and the other gateway router ;
When receiving the data of the IP address of the user terminal from the Internet, based on the transfer destination site information in the update mapping information, and characterized in that it comprises means for transferring the data to the other gateway routers Gateway router to do.

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