JP2007159157A - Mobile communication control system, mobile communication control method, and router device, server device and data structure appropriate to be used therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mobile communication control method and the like with which current location information of a transmission source mobile terminal and an IP address of a location information management server can be prevented from being leaked while preventing a communication path from becoming redundant. <P>SOLUTION: A mobile communication control method includes the steps of: at a transmission source router device AR2, translating a first address of a destination mobile communication terminal 2 contained in a packet as a destination address into a second address of the destination mobile communication terminal 2 stored in association with the first address of the mobile destination communication terminal 2; and at a destination router device AR3, translating the second address of the destination mobile communication terminal 2 contained in the packet as a destination address into the first address of the destination mobile communication terminal stored in association with the second address of the destination mobile communication terminal 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a mobile communication control system, a mobile communication control method, a router device, a server device, and a data structure suitable for use in these.

  In the conventional IP (Internet Protocol) network, in order to provide “mobility” of a mobile terminal (MN: Mobility Node), up to “home agent (HA)” that manages location information of the MN “Mobile IP” that provides mobility by transferring IP packets addressed to the MN and encapsulating and transferring IP packets addressed to the MN from the HA to the MN has been proposed (for example, see Non-Patent Documents 1 to 4). ).

  In Mobile IP, when the MN moves from the home network to the external network, it notifies the HA of an “IP address (CoA: Care of Address)” used in the external network. The HA holds the correspondence relationship of the CoA with respect to the “IP address (HoA)” fixedly assigned to the MN as binding cache information.

  “CN (Correspondent Node), which is a communication partner of MN, transmits an IP packet addressed to MN using HoA fixedly assigned to MN. An IP packet having HoA as a destination address is The packet is forwarded to the HA deployed in the home network of the MN, which encapsulates the IP packet sent from the CN and forwards it to the CoA, which is the current IP address of the MN.

In Mobile IP, the above-described communication via HA is called a “triangular route”. In addition, in order to perform “route optimization” in which packet transfer is performed directly from the CN to the MN without going through the HA, the MN directly notifies the CN that is the communication partner terminal of the CoA. It is also possible to transfer IP packets directly to
James D. Solomon, Fumio Teraoka, translation by Kei Inoue “Details Mobile IP”, Pearson Education Publishing Co., Ltd. "RFC2002 IP Mobility support" "RFC3220 IP Mobility Support for IPv4" "Draft-ietf-mobileip-ipv6-18.txt Mobility Support in IPv6"

  However, in the conventional “Mobile IP”, the communication from the CN to the MN (downlink communication) is via the HA installed in the home network of the MN, so that the communication path becomes redundant (triangular path). there were.

  In addition, in the conventional “Mobile IP”, when the MN uses a mechanism in which the CoA including the current location information is directly notified to the CN (that is, a mechanism for performing the route optimization described above), the CN has CoA including the location information of the MN is received, and there is a problem of location privacy in which the current location information of the MN leaks to the CN as the communication partner.

  In addition, in the conventional “Mobile IP”, CoA is used as the source address of the transmission packet from the MN in the communication (uplink communication) from the MN to the CN, and thus the above route optimization is not performed. However, there is a problem that the location information of the MN leaks to the CN.

  In addition, the conventional “Mobile IP” has a problem in that packet encapsulation is increased in the HA because packet encapsulation is performed.

  Further, in the conventional “Mobile IP”, when packet encapsulation for downlink communication or the like for performing uplink communication or route optimization is not performed, an IPv6 extension header is used, so that the overhead of the packet increases. there were.

  In addition, in the conventional “Mobile IP”, the IP address of the HA that manages the current location information of the MN is notified to the MN in advance, and the MN directly registers the location with the HA of the home network. Because of this, there is a problem that the IP address of the HA that manages and controls the mobility itself may be leaked to a third party, and is likely to be a target for an unauthorized attack.

  Therefore, the present invention has been made in view of the above points, and makes it possible to prevent leakage of the current location information of the MN and the IP address of the HA while preventing the communication path from becoming redundant. It is an object of the present invention to provide a mobile communication control system, a mobile communication control method, a router device, a server device, and a data structure suitable for use in these.

  A first feature of the present invention is a mobile communication control system comprising a server device and a plurality of router devices, wherein the server device associates a first address and a second address of a destination mobile communication terminal. An address management unit to be managed and a source router device wirelessly connected to the source mobile communication terminal are instructed to store the first address and the second address of the destination mobile communication terminal in association with each other. A first address storage unit that stores the first address and the second address of the destination mobile communication terminal in association with each other in response to an instruction from the server device. And the first address of the destination mobile communication terminal included as a destination address in the packet received from the source mobile communication terminal is the first address of the destination mobile communication terminal An address conversion unit that converts the address into a second address of the destination mobile communication terminal that is stored in association with a dress; and a destination router that is wirelessly connected to the destination mobile communication terminal based on the converted destination address A second address storage unit that stores the first address and the second address of the destination mobile communication terminal in association with each other, and a routing unit that routes the packet; The first address of the destination mobile communication terminal that stores the second address of the destination mobile communication terminal included as the destination address in the received packet in association with the second address of the destination mobile communication terminal. An address conversion unit that converts the packet to a destination address, and forwards the packet to the destination communication terminal based on the converted destination address. And summarized in that comprises a packet transfer unit.

  According to this invention, the source router device routes the packet to the destination router device based on the converted second address, and the destination router device addresses the packet based on the converted first address. Since the data is transferred to the mobile communication terminal (CN), it is possible to prevent the communication path from becoming redundant (triangular path) in downlink communication.

  Further, according to this invention, since the destination mobile communication terminal (CN) does not need to receive the CoA including the current location information of the source mobile communication terminal (MN), the source mobile communication terminal (MN) It is possible to avoid a location privacy problem in which the current position information leaks to the destination mobile communication terminal (CN) N.

  In addition, according to the invention, in the uplink communication, the first address (HoA) is used as the source address of the transmission packet from the source mobile communication terminal (MN), so that the source mobile communication terminal (MN) Can be prevented from leaking to the destination mobile communication terminal (CN).

  Further, according to this invention, the source router device does not perform packet encapsulation, and therefore, it is possible to avoid an increase in packet overhead.

  According to the invention, the instruction unit of the server device instructs the source router device to store the first address and the second address of the destination mobile communication terminal (CN) in association with each other. The IP address of the HA that manages the current location information of the source mobile communication terminal (MN) does not need to be notified in advance to the source mobile communication terminal (MN). There is a possibility that the communication terminal (MN) does not need to perform location registration directly with respect to the HA of the home network, and the IP address of the HA that manages and controls the mobility itself may be leaked to a third party. Can be avoided, making it difficult to become a target for unauthorized attacks.

  According to the invention, the instruction unit of the server device instructs the source router device to store the first address and the second address of the destination mobile communication terminal in association with each other. The accuracy of the second address (IP routing address) to be notified to can be made coarse. Moreover, according to this invention, the control range of the mobile communication terminal by the router device can be reduced, and higher-speed handover is possible.

  Further, in the first feature of the present invention, the destination router apparatus is configured such that when the destination mobile communication terminal has moved into a predetermined area or becomes active, the destination mobile communication terminal A selection notification unit that selects and notifies the server device of a second address of the destination mobile communication terminal that is stored in association with one address, and the address management unit of the server device receives the notified destination movement It is preferable to manage the second address of the communication terminal and the first address of the destination mobile communication terminal in association with each other.

  Moreover, in the first feature of the present invention, the source router apparatus includes the destination mobile communication included in the first address storage unit as a destination address in a packet received from the source mobile communication terminal. If the second address of the destination mobile communication terminal associated with the first address of the terminal is not stored, an inquiry unit that inquires the server device about the second address of the destination mobile communication terminal; The instruction unit of the server device preferably instructs to store the first address and the second address of the destination mobile communication terminal in association with each other in response to the inquiry from the source router device.

  Moreover, in the first feature of the present invention, the address management unit of the server device associates and manages the first address of the destination mobile communication terminal according to the movement status or state change of the destination mobile communication terminal, and It is preferable to change the second address.

  Further, in the first feature of the present invention, the instruction unit of the server device stores a router device that is not routed when the packet is transferred from the source mobile communication terminal to the destination mobile communication terminal. It is preferable to instruct to delete the first address and the second address of the destination mobile communication terminal.

  Also, in the first feature of the present invention, the address conversion unit of the source router device or the destination router device uses the determination bit in the packet to determine the first address of the destination mobile communication terminal and the destination mobile communication. It is preferable to distinguish from the second address of the terminal.

  In the first feature of the present invention, the source mobile communication terminal of the source mobile communication terminal includes an address conversion unit of the source router apparatus included as a source address in a packet received from the source mobile communication terminal. 1 address is converted to the second address of the source mobile communication terminal stored in association with the first address of the source mobile communication terminal, and the address conversion unit of the destination router device receives the address The source mobile communication terminal storing the second address of the source mobile communication terminal included in the packet as the source address in association with the second address of the source mobile communication terminal Conversion to the first address is preferred.

  A second feature of the present invention is that the source mobile communication terminal transmits the packet including the first address of the destination mobile communication terminal as a destination address, and the server device transmits the packet to the source mobile communication terminal. Instructing the wirelessly connected source router device to store the first address and the second address of the destination mobile communication terminal in association with each other, and the source router device includes the server In response to an instruction from the device, the process C for storing the first address and the second address of the destination mobile communication terminal in association with each other, and the source router device is included as a destination address in the received packet. A second address of the destination mobile communication terminal that stores a first address of the destination mobile communication terminal associated with the first address of the destination mobile communication terminal A step D of converting, and a step E in which the source router device routes the packet to a destination router device wirelessly connected to the destination mobile communication terminal based on the converted destination address; The destination stored in the destination router device in association with the second address of the destination mobile communication terminal, the second address of the destination mobile communication terminal included as a destination address in the received packet Summary of the invention includes a step F of converting to a first address of a mobile communication terminal, and a step G of transferring the packet to the destination communication terminal based on the converted destination address by the destination router device. To do.

  Further, in the second feature of the present invention, when the destination mobile communication terminal has moved into a predetermined area or has become active, the destination router apparatus is configured to Preferably, the method includes a step of selecting and notifying the server device of a second address of the destination mobile communication terminal stored in association with one address.

  Further, in the second feature of the present invention, the source router communication device includes the destination mobile communication included in the first address storage unit as a destination address in a packet received from the source mobile communication terminal. If the second address of the destination mobile communication terminal associated with the first address of the terminal is not stored, the server device is inquired about the second address of the destination mobile communication terminal, In step A, it is preferable that the server device instructs to store the first address and the second address of the destination mobile communication terminal in association with each other in response to the inquiry from the source router device.

  Further, in the second feature of the present invention, the server device associates and manages the first address and the second address of the destination mobile communication terminal according to the movement status or state change of the destination mobile communication terminal. Is preferably changed.

  In the second aspect of the present invention, the server device stores the router device that is not routed when the packet is transferred from the source mobile communication terminal to the destination mobile communication terminal. It is preferable to include a step of instructing to delete the first address and the second address of the destination mobile communication terminal.

  Also, in the second feature of the present invention, in the step C or the step E, the source router device or the destination router device uses a determination bit in the packet to determine a first address of the destination mobile communication terminal. And the second address of the destination mobile communication terminal.

  A third feature of the present invention is a server device installed in a mobile communication network that transfers packets from a source mobile communication terminal to a destination mobile communication terminal via a plurality of router devices, An address management unit that associates and manages a first address and a second address, and a source router device that is wirelessly connected to the source mobile communication terminal, a first address of the destination mobile communication terminal and And an instruction unit that instructs to store the second address in association with each other.

  Further, in the third feature of the present invention, the address management unit associates and manages the first address and the second address of the destination mobile communication terminal according to the movement status or state change of the destination mobile communication terminal. It is preferable to change the address.

  Further, in the third feature of the present invention, the instruction unit stores the router unit that is not routed when the packet is transferred from the source mobile communication terminal to the destination mobile communication terminal. It is preferable to instruct to delete the first address and the second address of the destination mobile communication terminal.

  A fourth feature of the present invention is a router apparatus that is wirelessly connected to a source mobile communication terminal, and is a first destination mobile communication terminal that is included as a destination address in a packet received from the source mobile communication terminal. An inquiry unit that inquires the server device about the second address of the destination mobile communication terminal when the second address of the destination mobile communication terminal associated with the address of the destination mobile communication terminal is not stored in the first address storage unit; In response to an instruction from the server device, a first address storage unit that stores a first address and a second address of the destination mobile communication terminal in association with each other, and is included as a destination address in the received packet The first address of the destination mobile communication terminal is stored in association with the first address of the destination mobile communication terminal. An address conversion unit that converts the packet into a destination address, and a routing unit that routes the packet to a destination router device that is wirelessly connected to the destination mobile communication terminal based on the converted destination address. Is the gist.

  4th characteristic of this invention WHEREIN: The said address conversion part uses the 1st address of the said transmission origin mobile communication terminal contained as a transmission origin address in the received said packet in the said transmission origin mobile communication terminal. It is preferable to convert to the second address of the source mobile communication terminal stored in association with the first address.

  A fifth feature of the present invention is a router apparatus that is wirelessly connected to a destination mobile communication terminal, and when the destination mobile communication terminal has moved into a predetermined area, or has entered an active state, A selection notification unit for selecting and notifying a server device of a second address of the destination mobile communication terminal to be stored in association with the first address of the destination mobile communication terminal; a first address of the destination mobile communication terminal; A second address storage unit for associating and storing a second address; and a second address of the destination mobile communication terminal included as a destination address in the received packet, and a second address of the destination mobile communication terminal An address conversion unit for converting to the first address of the destination mobile communication terminal stored in association with the address of the destination, and based on the converted destination address, the destination communication And summarized in that comprises a packet transfer unit that transfers the packet to the terminal.

  In the fifth aspect of the present invention, the address conversion unit converts the second address of the source mobile communication terminal included in the received packet as the source address to the second address of the source mobile communication terminal. It is preferable to convert to the first address of the source mobile communication terminal stored in association with the second address.

  In the fourth or fifth aspect of the present invention, the first address of the destination mobile communication terminal and the second address of the destination mobile communication terminal are preferably distinguished by a determination bit in the packet.

  In the fourth or fifth aspect of the present invention, it is preferable that the determination bit includes at least the most significant bit of the IPv6 address.

  In the fourth or fifth aspect of the present invention, it is preferable that the determination bit is composed of any one of bits 33 to 64 of the IPv6 address.

  A sixth feature of the present invention is a data structure of a packet transferred from a source mobile communication terminal to a destination mobile communication terminal via a plurality of routers, and is a source router wirelessly connected to the source mobile communication terminal A device stores a first address of the destination mobile communication terminal included as a destination address in the packet received from the source mobile communication terminal in association with the first address of the destination mobile communication terminal. Converting the second address of the destination mobile communication terminal to a second address of the destination mobile communication terminal, routing the packet to a destination router device wirelessly connected to the destination mobile communication terminal based on the converted destination address, The destination router apparatus uses the second address of the destination mobile communication terminal included as a destination address in the received packet as the destination mobile communication terminal. The destination is converted into the first address of the destination mobile communication terminal stored in association with the second address, and the packet is transferred to the destination communication terminal based on the converted destination address. The gist is that the determination bit for distinguishing between the first address of the mobile communication terminal and the second address of the destination mobile communication terminal includes at least the most significant bit of the IPv6 address.

  A seventh feature of the present invention is a data structure of a packet transferred from a source mobile communication terminal to a destination mobile communication terminal via a plurality of routers, and is a source router wirelessly connected to the source mobile communication terminal A device stores a first address of the destination mobile communication terminal included as a destination address in the packet received from the source mobile communication terminal in association with the first address of the destination mobile communication terminal. Converting the second address of the destination mobile communication terminal to a second address of the destination mobile communication terminal, routing the packet to a destination router device wirelessly connected to the destination mobile communication terminal based on the converted destination address, The destination router apparatus uses the second address of the destination mobile communication terminal included as a destination address in the received packet as the destination mobile communication terminal. The destination is converted into the first address of the destination mobile communication terminal stored in association with the second address, and the packet is transferred to the destination communication terminal based on the converted destination address. The gist is that the determination bit for distinguishing between the first address of the mobile communication terminal and the second address of the destination mobile communication terminal is composed of any one of bits 33 to 64 of the IPv6 address. To do.

  As described above, according to the present invention, it is possible to prevent leakage of the current location information of the source mobile terminal and the IP address of the location information management server while preventing the communication path from becoming redundant. It is possible to provide a mobile communication control system, a mobile communication control method, a router device, a server device, and a data structure suitable for these.

(Configuration of mobile communication control system according to one embodiment of the present invention)
Hereinafter, the configuration of a mobile communication control system according to an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the mobile communication control system according to this embodiment includes location information management servers a and b, router devices AR (Access Router) 1 to AR4, router devices ANC (Anchor Router) 1 and ANC2, Router devices BR (Border Router) 1 and BR2.

  In FIG. 1, a mobile packet communication network composed of a domain A and a domain B is shown. Here, the domain A and the domain B may be operated by the same business operator or may be operated by different business operators.

  The domain A and the domain B are connected by the router device BR1 and the router device BR2. Each domain A or B is composed of a plurality of router devices.

  Here, among the plurality of router devices, ANC1 and ANC2 are deployed as router devices having an address translation function, and AR1 to AR4 are deployed as first hop points for IP routing to mobile terminals.

  In addition to AR, BR, and ANC, router devices that perform normal IP routing may be connected between the router devices AR, ANC, and BR.

  Further, as a configuration under AR1 to AR4, a configuration in which an AP (Access Point) that terminates a plurality of wireless I / Fs or a configuration in which AR1 to 4 themselves support the wireless I / F can be employed.

  Further, in FIG. 1, as the access network, the mobile terminal 1 or 2 performs “location registration areas LA (Location Area) # 1 and LA # 2” for performing location registration with respect to the mobile packet communication network, and an IP packet. "Routing Area RA (Routing Area) # 1 to RA # 4", which is the smallest unit that can route the network, is shown.

  Here, LA is managed by one or more router devices AR, and RA is managed by one router device AR.

  In FIG. 1, the mobile terminal 1a in the active state moves from the routing area RA # 1 to the routing area RA # 2 within the location registration area LA # 2. Also, the Dormant state mobile terminal 1b has moved from the routing area RA # 4 in the location registration area LA # 1 to the routing area RA # 1 in the location registration area LA # 2. The mobile terminal 2 in the active state is located in the routing area RA # 3.

  Here, the Active state is a state in which an IP packet can be transmitted and received at any time, and the Dormant state is a state in which a packet is received as long as it does not move between LAs even if a packet is received in order to suppress transmission power and power consumption. This is a state where no transmission is performed.

  With reference to FIG. 2, the structure of the mobile terminals 1a, 1b, and 2 according to the present invention will be described. Since the configuration of the mobile terminals 1a and 1b and the configuration of the mobile terminal 2 are basically the same, only the configuration of the mobile terminal 1a will be described below.

  As shown in FIG. 2, the mobile terminal 1 a includes a communication I / F unit 10, a location registration unit 11, a notification information reception unit 12, a state transition notification unit 13, and a communication unit 14. It is.

  The communication I / F unit 10 transmits and receives packets to and from the router device AR2 that manages the routing area RA # 1 in which the mobile terminal 1a is located via a wireless connection.

  The location registration unit 11 sends the location information of the mobile terminal 1a to the location information management server b located in the domain B where the mobile terminal 1a is located via the router device AR2 to which the mobile terminal 1a is wirelessly connected. To register. The location registration unit 11 transmits a location registration packet to the location information management server b via the router device AR2 when the location registration area LA in which the mobile terminal 1a moves changes when the mobile terminal 1a moves.

  In the example of FIG. 1, the mobile terminal 1b in the Dormant state transmits a location registration packet to the router device AR1 when straddling the LA (movement from LA # 1 to LA # 2). Also, the mobile terminal 1a in the active state does not transmit a location registration packet when moving between RAs in the same LA # 2 (when moving from RA # 1 to RA # 2).

  The broadcast information receiving unit 12 receives left information such as paging from the router device AR2.

  The state transition notification unit 13 notifies the AR of the state transition of the Active state or Dormant state. The state transition notification unit 13 notifies at least two state transitions (Active state and Dormant state).

  For example, when the mobile terminal 1a shifts from the Dormant state to the Active state due to a trigger such as activation of an application or reception of paging from the router device AR, the state transition notification unit 13 shifts to the Active state with respect to the router device AR. Notify you.

  The communication unit 14 generates and transmits an IP packet to the destination mobile terminal 2 via the communication I / F unit 10. The communication unit 14 designates a packet that designates the IP host address (first address) of the destination mobile terminal 2 as the destination address and designates the IP host address (first address) of the source mobile terminal 1a as the source address. Generate.

  Here, the IP host address (first address) is an address that does not change depending on the current position or movement status of the mobile terminal, that is, an address for uniquely identifying the mobile terminal globally.

  On the other hand, an IP routing address, which will be described later, is an address that changes depending on the current position of the mobile terminal, movement status, and the like, and is an address for routing packets in an optimized route within the mobile packet communication network.

  The format of the packet includes a determination bit that can determine an IP host address and an IP routing address in a router device such as AR, BR, or ANC. As a result, existing fixed terminals and HoA of Mobile IP terminals are treated as IP routing addresses as before.

  The location information management servers a and b will be described with reference to FIG. Since the configuration of the location information management servers a and b is basically the same, only the configuration of the location information management server b will be described below.

  As shown in FIG. 3, the location information management server b includes a location information management unit 21, an IP routing address management unit 22, a mobile terminal state management unit 23, and a router device control unit 24.

  The location information management unit 21 manages LA information where a plurality of mobile terminals (for example, the mobile terminal 1a) having the domain B to which the location information management server b is connected as a home network are currently located.

  For example, as shown in FIG. 3, the location information management unit 21 responds to the location registration packet received from the mobile terminal 1a via the router device AR2, and the mobile terminal identification information (mobile terminal 1a) and the mobile terminal A table for associating the identification information (LA # 2) of the LA currently located is stored.

  The IP routing address management unit 22 is an address management unit that manages IP routing address information that associates an IP host address (first address) and an IP routing address (second address) of a destination mobile terminal.

  For example, as shown in FIG. 3, the IP routing address management unit 22 stores the IP host address #A and the IP routing address # X0 in association with each other, and associates the IP host address #B with the IP routing address # X1. Remember.

  In addition, the IP routing address management unit 22 has a function of notifying the router device of the IP routing address or IP host address of the corresponding mobile terminal when inquiring from the router device such as AR, BR, or ANC. .

  For example, the IP routing address management unit 22 transmits the IP host address (first address) and IP routing address (first address) of the destination mobile terminal 2 to the source router AR2 wirelessly connected to the source mobile terminal 1a. 2) is instructed to store in association with each other.

  In addition, the IP routing address management unit 22 determines whether or not the above-described IP routing address depends on the movement status of the mobile terminal (change in the LA information in the area) or the status change (the status transition between the Active status and the Dormant status). It has a function to change information.

  For example, when the router device AR is notified that the mobile terminal has transitioned from the Active state to the Dormant state, the IP routing address management unit 22 deletes the corresponding IP routing address information, and other router devices AR, It is possible to instruct the BR and ANC to delete the transmission cache table and the reception cache table.

  The IP routing address management unit 22 has a function of issuing an instruction to rewrite the IP routing address to router devices such as AR, BR, and ANC in response to the change of the IP routing address information.

  For example, the IP routing address management unit 22 stores the IP host address (first address) of the destination mobile terminal stored in the router device AR1 that is not routed when the packet is transferred from the source mobile terminal 1a to the destination mobile terminal 2. 1 address) and IP routing address (second address) can be instructed to be deleted.

  Further, when the IP host address (first address) and the IP routing address (second address) of the destination mobile terminal are notified from the router device (for example, AR2), the IP routing address management unit 22 receives these addresses. Whether or not to permit the use of the device is notified, and the determination result is notified to the router device. If the determination result is affirmative, the IP routing address management unit 22 manages the IP host address (first address) and IP routing address (second address) of the destination mobile terminal in association with each other.

  Further, the IP routing address management unit 22 may be configured to manage only the IP routing address information of the mobile terminal in the Active state and not manage the IP routing address information of the mobile terminal in the Dormant state.

  The mobile terminal state management unit 23 manages the state of the mobile terminal (Active state or Dormant state). For example, the mobile terminal state management unit 23 manages a mobile terminal whose IP routing address information is managed in the IP routing address management unit 22 as an “Active state”, and manages the IP routing address information in the IP routing address management unit 22. A mobile terminal that is not connected may be managed as a “Dormant state”.

  The router device control unit 24 transmits and receives control packets and the like using a predetermined communication protocol with the router devices AR, BR, and ANC in the domain B to which the location management server device b is connected. .

  For example, when receiving a location registration packet from the mobile terminal 1a via the router device AR2, the router device control unit 24 transfers the received location registration packet to the location information management unit 21.

  Further, the router device control unit 24 transmits the above-mentioned instruction from the IP routing address management unit 22 to the router device AR2.

  A plurality of router devices AR1 to AR4, BR1 and BR2, ANC1 and ANC2 will be described with reference to FIG. Since the configurations of the plurality of router devices AR1 to AR4, BR1 and BR2, ANC1 and ANC2 are almost the same, the configuration of the router device AR2 will be described below, and the configuration unique to each router device will be described as appropriate. .

  As shown in FIG. 4, the router device AR2 includes a mobile terminal I / F unit 31, a location information management server I / F unit 32, a network I / F unit 33, a routing table storage unit 34, a transmission cache, A table storage unit 35, a reception cache table storage unit 36, an address determination unit 37, a buffer unit 38,... A routing unit 39, and a table update unit 40 are provided.

  The router devices ANC and BR have the same configuration as that of the router device AR2 except that the router devices ANC and BR do not include the mobile terminal I / F unit 31.

  The mobile terminal I / F unit 31 transmits and receives packets (including IP packets and location registration packets) via a wireless connection with the mobile terminal 1a located in RA # 2 managed by the AR2. .

  When the mobile terminal 1a has moved into the predetermined area (RA # 2) or has entered the Active state, the mobile terminal I / F unit 31 receives the IP host address (first address) of the mobile terminal 1a. ) To select and store the IP routing address (second address) of the mobile terminal 1a and store it to the location information management server b via the location information management server I / F unit 32. .

Also, the mobile terminal I / F unit 31 receives various control packets from the mobile terminal 1a, and resolves the address of the corresponding location information management server b from the IP host address that is the source address in the received control packet. Then, the control packet is transferred to the position information management server b via the position information management server I / F unit 32.

  When the mobile terminal I / F unit 31 receives a paging packet from the location information management server b via the location information management server I / F unit 32, the mobile terminal I / F unit 31 interprets the message content in the paging packet and A paging process can be performed.

  The location information management server I / F unit 32 creates a transmission cache table or a reception cache table using a predetermined communication protocol with the location information management server b arranged in the domain B to which the AR 2 belongs. Control packets such as change and deletion instructions and paging signals are transmitted and received.

  For example, when the mobile terminal in the active state moves from RA # 1 to RA # 2, the location information management server I / F unit 32 of the router apparatus AR2 that manages RA # 2 uses the mobile terminal I / F unit 31 to With the reception of the control packet from the terminal as a trigger, an IP routing address is assigned to the mobile terminal, and this is notified to the location information management server b. Then, when the location information management server I / F unit 32 obtains the allocation permission from the location information management server b, the location information management server I / F unit 32 notifies the table updating unit of the fact.

In addition, the location information management server I / F unit 32 receives the Active state received from the mobile terminal by the mobile terminal I / F unit 31 when the mobile terminal transitions from the Dormant state to the Active state due to a trigger such as application activation or paging. In response to the notification of the transition to (1), one IP routing address is assigned to the mobile terminal from the pooled IP routing address band, and the fact is notified to the location information management server b. When the location information management server b obtains the allocation permission from the location information management server b, the location information management server I / F unit 32 registers it as an official IP routing address and notifies the table update unit accordingly.

  In addition, when the mobile terminal I / F unit 31 receives, as a control packet, a location registration message that is transmitted when a mobile terminal in the Dormant state straddles LA, the location information management server I / F unit 32 The location registration message is transferred to the location information management server b using the IP host address as a key. That is, the location information management server I / F unit 32 functions as a proxy for the mobile terminal.

  The network I / F unit 33 transmits and receives IP packets to and from other router devices (for example, ANC1) in the domain B to which the AR2 belongs.

  The routing table storage unit 34 stores a routing table based on the IP routing address. For example, in the routing table in AR2, the IP packet having the IP routing address # X1 is stored as routing information so as to be routed to the router device ANC1.

  The transmission cache table storage unit 35 stores the IP host address (first address) and IP routing address (second address) of the destination mobile terminal in association with each other in accordance with an instruction from the location information management server b. 1 address storage unit is configured.

  For example, the transmission cache table storage unit 35 stores a table associating the IP host address #B and the IP routing address # X1 for the mobile terminal managed by the router device AR2, as shown in FIG.

  The reception cache table storage unit 36 stores the IP host address (first address) and IP routing address (second address) of the destination mobile terminal in association with each other in accordance with an instruction from the location information management server b. 2 address storage units.

  For example, the reception cache table storage unit 36 stores a table associating the IP routing address # X0 and the IP host address #B for the mobile terminal managed by the router device AR2, as shown in FIG.

  The address determination unit 37 determines whether the destination address of the IP packet received from the source mobile terminal 1a is an IP host address (first address) or an IP routing address (second address). .

  Specifically, the address determination unit 37 determines whether it is an IP host address (first address) or an IP routing address (second address) by referring to a determination bit in the IP packet. .

  Here, the format of the IP packet used in this embodiment will be described with reference to FIG. In the present embodiment, the IP host address and the IP routing address can be realized by defining “determination bits” in the address system of the (existing) IPv6 address shown in FIG.

  As a first method, as shown in FIG. 2B, a method of setting a “determination bit” in an “FP (Format Prefix) area” defined in 3 bits including the most significant bit of the IPv6 address is conceivable. . Currently, it is defined that “001” is set as a global unicast address in the FP area.

  In this method, for example, as shown in FIG. 5B, in the case of an IP routing address including “HoA” and “CoA” used in an existing IPv6 fixed terminal, Mobile IP terminal, etc., “001” is set in the “FP area”. (The value currently defined as a global unicast address) "is set, and on the other hand, in the case of an IP host address," 010 "is set in the" FP area "to define the" determination bit ".

  However, in this embodiment, in the case of an IP host address, “010” is set as the value of “FP area”. However, the present invention is not limited to this, and the value of “FP area”. Other values can be set as

  As a second method, a method of setting a “determination bit” in a bit next to “ISP ID” in the network prefix as shown in FIG. Here, the “ISP ID” is assigned to a communication carrier (communication carrier) or ISP based on an existing assignment rule.

  In this method, for example, as shown in FIG. 3C, in the case of an IP routing address, “1” is set to the next bit of “ISP ID”, and in the case of an IP host address, the next bit of “ISP ID” is set. By setting “0”, a “determination bit” is defined.

  However, in this embodiment, the “judgment bit” is defined for the next bit of “ISP ID”. However, the present invention is not limited to this, and any of the 33 bits to 64 bits of the IPv6 address can be used. The “determination bit” can be defined by any one of these bits, or any of the 65 to 128 bits.

  By using the first method or the second method described above, it is possible to define a determination bit for determining an IP host address and an IP routing address without specifying a new address format for the IP packet. become.

  Further, according to the present invention, an IP host address and an IP routing address can be determined by defining a “determination bit” in the address system in the same manner for an IPv4 address other than an IPv6 address.

  Also, if the address determination unit 37 determines that the destination address in the IP packet is “IP host address”, whether or not the data related to the IP host address exists in the transmission cache table storage unit 35. Judge about.

  If the address determination unit 37 determines that the data related to the IP host address exists in the transmission cache table storage unit 35, the address determination unit 37 sets the IP host address (first address) to the IP routing address (second address). An address conversion unit for converting to (address) is configured. In such a case, the address determination unit 37 transmits the IP packet obtained by converting the destination address to the routing unit 39.

  On the other hand, if the address determination unit 37 determines that the data related to the IP host address does not exist in the transmission cache table storage unit 35, the address determination unit 37 temporarily buffers the IP packet in the buffer unit 38.

  In this case, the address determination unit 37 uses an IP host address as a destination address as a key, and an inquiry unit that inquires the location information management server b (or the location information management server a) about the IP routing address of the destination mobile terminal 2. Constitute.

  Further, the address determination unit 37 determines the destination address of the IP packet buffered in the buffer unit 38 from the IP host address according to the response result from the location information management server b (or the location information management server a). The IP packet is converted into an IP routing address, and the IP packet is transferred to the routing unit 39.

  If the address determination unit 37 determines that the destination address in the IP packet is an “IP routing address”, the address determination unit 37 transfers the IP packet to the routing unit 39 without converting the destination address of the IP packet.

  In addition, the address determination unit 37 receives the IP packet when the destination address of the IP packet is an IP routing address and the data related to the IP routing address exists in the reception cache table storage unit 36. Referring to 36, the destination address of the IP address is converted from the IP routing address to the IP host address, and the IP packet is transferred to the routing unit 39.

  The routing unit 39 refers to the routing table storage unit 34 and determines the destination router AR3 wirelessly connected to the destination mobile terminal 2 based on the converted destination address (IP routing address or IP host address). IP packets are routed.

  In the present embodiment, the routing unit 39 transfers an IP packet whose destination address is an IP routing address to the router device ANC1 via the network I / F unit 33.

  The routing unit 39 constitutes a packet transfer unit that transfers an IP packet whose destination address is an IP host address to the mobile terminal 1 a via the mobile terminal I / F unit 31.

  The routing unit 39 performs IP packet routing processing based on a routing protocol such as OSPF.

  In response to the instruction from the location information management server b received via the location information management server I / F unit 32, the table update unit 40 receives the routing table storage unit 34, the transmission cache table storage unit 35, and the reception cache table. The storage unit 36 is updated.

  For example, the table updating unit 40 sends the IP routing of the mobile terminal 2 to the transmission cache table storage unit 35 according to the inquiry result to the location information management server b (or the location information management server a) by the address determination unit 37. Add new data related to the address.

(Operation of Mobile Communication Control System According to One Embodiment of the Present Invention)
FIG. 6 shows a sequence diagram when an IP packet is transferred from the mobile terminal 1a to the mobile terminal 2 in the mobile communication control system according to the embodiment of the present invention. Here, it is assumed that the IP host address (first address) of the mobile terminal 1a is “A” and the IP host address (first address) of the mobile terminal 2 is “B” as shown in FIG. In step 601, the mobile terminal 1 a transmits an IP packet in which the IP host address (first address) “B” of the mobile terminal 2 is set as the destination address to the router apparatus AR 2 via the wireless line.

  In step 602, the address determination unit 37 of the router device AR 2 refers to the transmission cache table storage unit 35 and sets the destination address of the received IP packet as the IP host address (first address) “B” of the mobile terminal 2. To the IP routing address (second address) “X1” of the mobile terminal 2.

  In step 603, the routing unit 39 of the router device AR2 refers to the routing table storage unit 34 and transfers the IP packet (destination address “X1”) subjected to address translation to the router device ANC1.

  In step 604, the address determination unit 37 of the router apparatus ANC1 sets the IP routing address (second address) “X1” of the mobile terminal 2 in the IP packet according to the determination bit in the received IP packet. Is determined.

  In step 605, the routing unit 39 of the router device ANC1 refers to the routing table storage unit 34 and transfers the IP packet (destination address “X1”) to the router device BR1 without performing address conversion.

  Thereafter, by repeating Steps 604 and 605 from Step 606 to Step 611, the IP packet in which the IP routing address (second address) “X1” of the mobile terminal 2 is set as the destination address becomes the destination mobile terminal 2. To the router AR3 that is wirelessly connected.

  In step 612, the address determination unit 37 of the router device AR3 refers to the reception cache table storage unit 35, and determines the destination address of the received IP packet as the IP routing address (second address) “X1” of the mobile terminal 2. To the IP host address (first address) “B” of the mobile terminal 2.

  In step 613, the routing unit 39 of the router device AR3 refers to the routing table storage unit 34 and transfers the IP packet (destination address “B”) subjected to address translation to the mobile terminal 2 via the wireless line. .

(Operation / Effect of Mobile Communication Control System According to One Embodiment of the Present Invention)
According to the mobile communication control system according to the present embodiment, the source router device AR2 routes the IP packet to the destination router device AR3 based on the converted IP routing address (second address), and the destination router Since the device AR3 transfers the IP packet to the destination mobile terminal 2 based on the converted IP host address (first address), it is possible to avoid a redundant communication path (triangular path) in downlink communication. .

  Further, according to the mobile communication control system according to the present embodiment, since the destination mobile terminal 2 does not need to receive the CoA including the current location information of the source mobile terminal 1a, It is possible to avoid the location privacy problem in which the location information LA # 2 leaks to the destination mobile terminal 2.

  Further, according to the mobile communication control system according to the present embodiment, since the IP host address (first address) is used as the source address of the transmission packet from the source mobile terminal 1a in uplink communication, Leakage of the location information LA # 2 of the mobile terminal 1a to the destination mobile terminal 1a can be prevented.

  Further, according to the mobile communication control system according to the present embodiment, the source router AR2 does not encapsulate the IP packet, so that an increase in packet overhead can be avoided.

  Also, according to the mobile communication control system according to the present embodiment, the router device control unit 24 of the location information management server b sends the IP host address (first address) of the destination mobile terminal 2 to the source router device AR2. ) And the IP routing address (second address) in association with each other, the IP address of the HA that manages the current location information LA # 2 of the source mobile terminal 1a is sent to the source mobile terminal 1a. It is not necessary to be notified in advance, and the source mobile terminal 1a does not need to directly perform location registration to the HA of the home network, and manages and controls mobility. It is possible to avoid the possibility that the HA IP address itself is leaked to a third party, and it becomes difficult to be subject to unauthorized attacks.

  Also, according to the mobile communication control system according to the present embodiment, the router device control unit 24 of the location information management server b sends the IP host address (first address) of the destination mobile terminal 2 to the source router device AR2. ) And the IP routing address (second address) are stored in association with each other, the accuracy of the IP routing address (second address) notified to the other domain can be made coarse. Moreover, according to this invention, the control range of the mobile terminal by a router apparatus can be made small, and a faster handover is attained.

(Example of change)
The present invention is not limited to the above-described embodiment. For example, all router apparatuses ANC1 and BR1 in a specific domain (for example, domain B) may be configured to translate IP routing addresses. . For example, the router device ANC1 converts the IP routing address from “X1” to “X2”, and the router device BR1 converts the IP routing address from “X2” to “X3”. Also, the present invention can be applied.

  Further, the present invention may be configured to convert the IP routing address, for example, in some router apparatuses ANC1 in a specific domain (for example, domain A).

  In the present invention, the router device that performs IP routing address conversion is different in the upstream direction (the direction from the mobile terminal 1a to the mobile terminal 2) and in the downstream direction (the direction from the mobile terminal 2 to the mobile terminal 1a). Also good.

  Further, the present invention is applied not only when address conversion is performed on a destination address but also when address conversion is performed on a source address.

1 is an overall configuration diagram of a mobile communication control system in the present invention. It is a functional block diagram of the mobile communication terminal (mobile terminal) in the mobile communication control system in this invention. It is a functional block diagram of the location information management server in the mobile communication control system in the present invention. It is a functional block diagram of the router apparatus in the mobile communication control system in this invention. It is a figure which shows the format of the IP host address and IP routing address used with the mobile communication control system in this invention. It is a sequence diagram which shows the operation | movement in the mobile communication control system in this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a, 1b, 2 ... Mobile terminal 10 ... Communication I / F part 11 ... Location registration part 12 ... Notification information receiving part 13 ... State transition notification part 14 ... Communication part 21 ... Position information management part 22 ... IP routing address management part 23 ... mobile terminal state management unit 24 ... router device control unit 31 ... mobile terminal I / F unit 32 ... location information management server I / F unit 33 ... network I / F unit 34 ... routing table storage unit 35 ... transmission cache table storage Unit 36 ... reception cache table storage unit 37 ... address determination unit 38 ... buffer unit 39 ... routing unit 40 ... table update unit a, b ... location information management server AR, ANC, BR ... router device LA ... location registration area RA ... Routing area

Claims (25)

A mobile communication control system comprising a server device and a plurality of router devices,
The server device
An address management unit for managing the first address and the second address of the destination mobile communication terminal in association with each other;
An instruction unit that instructs a source router device wirelessly connected to a source mobile communication terminal to store the first address and the second address of the destination mobile communication terminal in association with each other;
The source router device is
A first address storage unit that stores a first address and a second address of the destination mobile communication terminal in association with each other according to an instruction from the server device;
The destination stored in association with the first address of the destination mobile communication terminal, the first address of the destination mobile communication terminal included as a destination address in a packet received from the source mobile communication terminal An address conversion unit for converting the second address of the mobile communication terminal;
A routing unit that routes the packet to a destination router device that is wirelessly connected to the destination mobile communication terminal based on the converted destination address;
The destination router device is
A second address storage unit for storing the first address and the second address of the destination mobile communication terminal in association with each other;
The first address of the destination mobile communication terminal that stores the second address of the destination mobile communication terminal included as the destination address in the received packet in association with the second address of the destination mobile communication terminal. An address conversion unit for converting the address to
A mobile communication control system comprising: a packet transfer unit that transfers the packet to the destination communication terminal based on the converted destination address. The destination router apparatus stores the destination mobile communication terminal in association with the first address of the destination mobile communication terminal when the destination mobile communication terminal has moved into a predetermined area or becomes active. A selection notification unit that selects a second address of the communication terminal and notifies the server device;
The address management unit of the server device manages the notified second address of the destination mobile communication terminal and the first address of the destination mobile communication terminal in association with each other. Mobile communication control system. The source router device is associated with the first address of the destination mobile communication terminal included as a destination address in a packet received from the source mobile communication terminal in the first address storage unit. If the second address of the destination mobile communication terminal is not stored, an inquiry unit for inquiring the server device for the second address of the destination mobile communication terminal;
The instruction unit of the server device instructs to store the first address and the second address of the destination mobile communication terminal in association with each other in response to the inquiry from the source router device. The mobile communication control system according to claim 1.   The address management unit of the server device changes a first address and a second address of the destination mobile communication terminal to be managed in association with each other according to a movement state or state change of the destination mobile communication terminal. The mobile communication control system according to claim 1.   The instruction unit of the server device stores the first destination mobile communication terminal stored in the router device that is not routed when the packet is transferred from the source mobile communication terminal to the destination mobile communication terminal. The mobile communication control system according to claim 1, wherein an instruction is given to delete the address and the second address.   The address conversion unit of the source router device or the destination router device distinguishes between the first address of the destination mobile communication terminal and the second address of the destination mobile communication terminal based on a determination bit in the packet The mobile communication control system according to claim 1. A step A in which the source mobile communication terminal transmits a packet including the first address of the destination mobile communication terminal as a destination address;
Step B in which the server apparatus instructs the source router apparatus wirelessly connected to the source mobile communication terminal to store the first address and the second address of the destination mobile communication terminal in association with each other. When,
A step C in which the source router device stores the first address and the second address of the destination mobile communication terminal in association with each other in accordance with an instruction from the server device;
The source router device stores the first address of the destination mobile communication terminal included as a destination address in the received packet in association with the first address of the destination mobile communication terminal Step D for converting to the second address of the destination mobile communication terminal;
The source router device routing the packet to a destination router device wirelessly connected to the destination mobile communication terminal based on the converted destination address; and
The destination stored in the destination router device in association with the second address of the destination mobile communication terminal, the second address of the destination mobile communication terminal included as a destination address in the received packet Step F for converting to the first address of the mobile communication terminal;
The destination router apparatus has a step G of transferring the packet to the destination communication terminal based on the converted destination address.   When the destination mobile communication terminal has moved into a predetermined area or becomes active, the destination router device stores the destination mobile in association with the first address of the destination mobile communication terminal The mobile communication control method according to claim 7, further comprising a step of selecting a second address of a communication terminal and notifying the server device. The source router device is associated with the first address of the destination mobile communication terminal included in the first address storage unit as a destination address in a packet received from the source mobile communication terminal If the second address of the destination mobile communication terminal is not stored, the server device is inquired about the second address of the destination mobile communication terminal;
In the step B, the server device instructs to store the first address and the second address of the destination mobile communication terminal in association with each other in response to the inquiry from the source router device. The mobile communication control method according to claim 7.   The server device changes a first address and a second address of the destination mobile communication terminal managed in association with each other according to a movement state or a state change of the destination mobile communication terminal. The mobile communication control method described in 1.   The server device stores the first address and the first address of the destination mobile communication terminal stored in the router device that is not routed when the packet is transferred from the source mobile communication terminal to the destination mobile communication terminal. The mobile communication control method according to claim 7, further comprising a step of instructing to delete the second address.   In the step D or the step F, the source router device or the destination router device determines the first address of the destination mobile communication terminal and the second address of the destination mobile communication terminal according to the determination bit in the packet. The mobile communication control method according to claim 7, wherein: A server device installed in a mobile communication network for transferring packets from a source mobile communication terminal to a destination mobile communication terminal via a plurality of router devices,
An address management unit that associates and manages the first address and the second address of the destination mobile communication terminal;
An instruction unit that instructs the source router apparatus wirelessly connected to the source mobile communication terminal to store the first address and the second address of the destination mobile communication terminal in association with each other. The server apparatus characterized by the above-mentioned.   The said address management part changes the 1st address and 2nd address of the said destination mobile communication terminal managed in association according to the movement condition or state change of the said destination mobile communication terminal. 14. The server device according to 13.   The instructing unit stores the first address and the first address of the destination mobile communication terminal stored in the router device that is not routed when the packet is transferred from the source mobile communication terminal to the destination mobile communication terminal. The server apparatus according to claim 13, wherein the server apparatus instructs to delete the second address. A router device wirelessly connected to a source mobile communication terminal,
The second address of the destination mobile communication terminal associated with the first address of the destination mobile communication terminal included as the destination address in the packet received from the source mobile communication terminal is stored in the first address storage unit. An inquiry unit that inquires the server device about the second address of the destination mobile communication terminal, if not stored;
A first address storage unit that stores a first address and a second address of the destination mobile communication terminal in association with each other according to an instruction from the server device;
The second address of the destination mobile communication terminal that stores the first address of the destination mobile communication terminal included in the received packet as the destination address in association with the first address of the destination mobile communication terminal. An address conversion unit for converting the address to
A router device comprising: a routing unit that routes the packet to a destination router device that is wirelessly connected to the destination mobile communication terminal based on the converted destination address. A router device wirelessly connected to a destination mobile communication terminal, wherein when the destination mobile communication terminal has moved into a predetermined area or becomes active, the first mobile communication terminal of the destination mobile communication terminal A selection notification unit that selects a second address of the destination mobile communication terminal to be stored in association with an address and notifies the server device of the second address;
A second address storage unit for storing the first address and the second address of the destination mobile communication terminal in association with each other;
The second address of the destination mobile communication terminal stored in association with the second address of the destination mobile communication terminal is stored in association with the second address of the destination mobile communication terminal included in the received packet as the destination address. An address conversion unit for converting the address into one address;
A router apparatus comprising: a packet transfer unit that transfers the packet to the destination communication terminal based on the converted destination address.   The router device according to claim 16 or 17, wherein the first address of the destination mobile communication terminal and the second address of the destination mobile communication terminal are distinguished by a determination bit in the packet.   The router apparatus according to claim 18, wherein the determination bit includes at least the most significant bit of an IPv6 address.   19. The router device according to claim 18, wherein the determination bit is configured by any one of bits 33 to 64 of an IPv6 address. A data structure of a packet transferred from a source mobile communication terminal to a destination mobile communication terminal via a plurality of routers,
A source router apparatus wirelessly connected to the source mobile communication terminal receives the first address of the destination mobile communication terminal included as a destination address in the packet received from the source mobile communication terminal, The second address of the destination mobile communication terminal stored in association with the first address of the destination mobile communication terminal is converted and wirelessly connected to the destination mobile communication terminal based on the converted destination address. Routing the packet to a destination router device,
The destination stored in the destination router device in association with the second address of the destination mobile communication terminal, the second address of the destination mobile communication terminal included as a destination address in the received packet When converting the first address of the mobile communication terminal and transferring the packet to the destination communication terminal based on the converted destination address,
A packet in which the determination bit for distinguishing between the first address of the destination mobile communication terminal and the second address of the destination mobile communication terminal includes at least the most significant bit of the IPv6 address Data structure. A data structure of a packet transferred from a source mobile communication terminal to a destination mobile communication terminal via a plurality of routers,
A source router apparatus wirelessly connected to the source mobile communication terminal receives the first address of the destination mobile communication terminal included as a destination address in the packet received from the source mobile communication terminal, The second address of the destination mobile communication terminal stored in association with the first address of the destination mobile communication terminal is converted and wirelessly connected to the destination mobile communication terminal based on the converted destination address. Routing the packet to a destination router device,
The destination stored in the destination router device in association with the second address of the destination mobile communication terminal, the second address of the destination mobile communication terminal included as a destination address in the received packet When converting the first address of the mobile communication terminal and transferring the packet to the destination communication terminal based on the converted destination address,
The determination bit for distinguishing between the first address of the destination mobile communication terminal and the second address of the destination mobile communication terminal is composed of any one of bits 33 to 64 of the IPv6 address. Feature packet data structure.   The address conversion unit of the source router device uses the first address of the source mobile communication terminal included as a source address in the packet received from the source mobile communication terminal, as the source mobile communication terminal Is converted to a second address of the source mobile communication terminal stored in association with the first address, and the address conversion unit of the destination router device is included as a source address in the received packet Converting the second address of the source mobile communication terminal to the first address of the source mobile communication terminal stored in association with the second address of the source mobile communication terminal The mobile communication control system according to claim 1.   The address conversion unit stores a first address of the source mobile communication terminal included as a source address in the received packet in association with the first address of the source mobile communication terminal. The router device according to claim 16, wherein the router device converts to a second address of the source mobile communication terminal.   The address conversion unit stores a second address of the source mobile communication terminal included in the received packet as a source address in association with the second address of the source mobile communication terminal. The router device according to claim 17, wherein the router device converts the first address of the source mobile communication terminal.

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