JP6334207B2 - Communication method - Google Patents

Description

  The present invention relates to a mobile communication system, a mobile communication device, a communication method, and a program.

  Various technical developments related to wireless networks have been conducted. For example, Patent Document 1 discloses a method of assigning an Internet protocol (IP) address to a wireless client in a wireless network. Patent Document 1 also discloses communication via an IP tunnel in a wireless network.

  In recent years, broadbandization of mobile lines has progressed, and large-capacity communication has become possible. In addition, a mobile router that can use a plurality of wireless links can realize a wide band by bundling a plurality of wireless links.

Special table 2009-500918

However, there is a problem that securing of communication quality and confidentiality is insufficient.
The present invention has been made to solve such problems, and an object of the present invention is to provide a mobile communication system, a mobile communication device, a communication method, and a program that improve communication quality and confidentiality. And

  The mobile communication system according to the present invention includes a first mobile communication device and a second mobile communication device. The first mobile communication device includes a plurality of wireless communication modules including a first wireless communication module to which a first fixed IP address is assigned. The second mobile communication device includes a plurality of wireless communication modules including a second wireless communication module to which a second fixed IP address is assigned. The plurality of wireless communication modules provided in the first mobile communication device and the plurality of wireless communication modules provided in the second mobile communication device are respectively connected by a plurality of IP tunnels. The first wireless communication module and the second wireless communication module are connected by a first IP tunnel.

  The mobile communication device according to the present invention includes a plurality of wireless communication modules including a first wireless communication module to which a first fixed IP address is assigned. The plurality of wireless communication modules are connected to a plurality of wireless communication modules included in the counterpart mobile communication device through a plurality of IP tunnels, respectively. The plurality of wireless communication modules included in the counterpart mobile communication device include a second wireless communication module to which a second fixed IP address is assigned. The first wireless communication module and the second wireless communication module are connected by a first IP tunnel.

  In the communication method according to the present invention, a plurality of wireless communication modules provided in the first mobile communication device and a plurality of wireless communication modules provided in the second mobile communication device are respectively connected by a plurality of IP tunnels. The plurality of wireless communication modules included in the first mobile communication device include a first wireless communication module to which a first fixed IP address is allocated. The plurality of wireless communication modules included in the second mobile communication device include a second wireless communication module to which a second fixed IP address is allocated. The plurality of wireless communication modules included in the first mobile communication device and the plurality of wireless communication modules included in the second mobile communication device are connected to each other through the plurality of IP tunnels. And connecting the second wireless communication module with a first IP tunnel.

  In the communication method according to the present invention, a first wireless communication module to which a first fixed IP address is allocated transmits a first tunnel connection request to a second wireless communication module to which a second fixed IP address is allocated, and the first wireless communication module A communication module transmits an IP address acquisition request to the second wireless communication module through a first IP tunnel connecting the first wireless communication module and the second wireless communication module, and a third wireless communication module transmits the IP The second tunnel connection request is transmitted to the fourth wireless communication module to which the IP address acquired based on the address acquisition request is allocated. A first mobile communication device includes the first wireless communication module and the third wireless communication module. A second mobile communication device includes the second wireless communication module and the fourth wireless communication module.

  According to the communication method of the present invention, the first wireless communication module to which the first fixed IP address is assigned receives the first tunnel connection request received from the second wireless communication module to which the second fixed IP address is assigned. A connection response is transmitted to the second wireless communication module, and the first wireless communication module is connected from the second wireless communication module via a first IP tunnel connecting the first wireless communication module and the second wireless communication module. In response to the received IP address acquisition request, the IP address allocated to the third wireless communication module is transmitted to the second wireless communication module via the first IP tunnel, and the third wireless communication module transmits the fourth wireless communication. In response to the second tunnel connection request received from the module, a second tunnel connection response is sent to the fourth radio. To send to the signal module. A first mobile communication device includes the first wireless communication module and the third wireless communication module. A second mobile communication device includes the second wireless communication module and the fourth wireless communication module.

  In the program according to the present invention, a first wireless communication module to which a first fixed IP address is assigned transmits a first tunnel connection request to a second wireless communication module to which a second fixed IP address is assigned, and the first wireless communication The module transmits an IP address acquisition request to the second wireless communication module via a first IP tunnel connecting the first wireless communication module and the second wireless communication module, and the third wireless communication module transmits the IP address. A computer is caused to execute a communication method for transmitting a second tunnel connection request to a fourth wireless communication module to which an IP address acquired based on the acquisition request is allocated. A first mobile communication device includes the first wireless communication module and the third wireless communication module. A second mobile communication device includes the second wireless communication module and the fourth wireless communication module.

  According to the program of the present invention, the first wireless communication module to which the first fixed IP address is allocated responds to the first tunnel connection request received from the second wireless communication module to which the second fixed IP address is allocated. A response is transmitted to the second wireless communication module, and the first wireless communication module is received from the second wireless communication module via a first IP tunnel connecting the first wireless communication module and the second wireless communication module. In response to the received IP address acquisition request, an IP address assigned to the third wireless communication module is transmitted to the second wireless communication module via the first IP tunnel, and the third wireless communication module is connected to the fourth wireless communication module. In response to the second tunnel connection request received from the second tunnel connection response. To execute the communication method to be transmitted to the communication module to the computer. A first mobile communication device includes the first wireless communication module and the third wireless communication module. A second mobile communication device includes the second wireless communication module and the fourth wireless communication module.

  According to the present invention, it is possible to provide a mobile communication system, a mobile communication device, a communication method, and a program that improve communication quality and confidentiality.

1 is a schematic diagram of a mobile communication system according to a first exemplary embodiment. FIG. 3 is a flowchart of a communication method according to the first exemplary embodiment. FIG. 3 is a schematic diagram of a mobile communication system according to a second exemplary embodiment. It is a figure of the management table with which a client is provided. It is a figure of the management table with which a server is provided. FIG. 6 is a connection sequence diagram of a communication method according to a second exemplary embodiment. It is a conceptual diagram of the communication path switching which the mobile communication system concerning Embodiment 2 performs. It is a conceptual diagram which shows an example of the connection pattern of a radio link. It is a conceptual diagram which shows the other example of the connection pattern of a radio link. It is a figure which shows the content after the connection priority order change of the management table with which the client concerning Embodiment 3 is provided.

(Embodiment 1)
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic diagram of a mobile communication system according to the first embodiment. The mobile communication system according to the first embodiment includes mobile communication devices 10 and 20. Each of the mobile communication devices 10 and 20 is, for example, a mobile router having a plurality of wireless links, but is not limited to this. The mobile communication device 10 includes a plurality of communication modules 11 and 12. The mobile communication device 20 includes a plurality of communication modules 21 and 22. The communication modules 11, 12, 21, and 22 are wireless communication modules.

  Each of the communication modules 11 and 21 is assigned a fixed IP address. A plurality of communication modules 11 and 12 included in the mobile communication device 10 and a plurality of communication modules 21 and 22 included in the mobile communication device 20 are connected by a plurality of IP tunnels 31 and 32, respectively. Communication modules 11 and 21 to which a fixed IP address is allocated are connected to each other through an IP tunnel 31, and communication modules 12 and 22 are connected to each other through an IP tunnel 32.

  According to the present embodiment, since the mobile communication devices 10 and 20 are connected to each other by the plurality of IP tunnels 31 and 32, the communication quality can be improved by utilizing the line redundancy function. Furthermore, since the communication modules 11 and 21 to which a fixed IP address is allocated are connected by the IP tunnel 31, end-to-end tunnel communication is possible without a DNS (Domain Name System) server. Therefore, the confidentiality of communication is improved.

  Furthermore, according to the present embodiment, multi-connection of communication lines using a plurality of radio carriers is possible. The mobile communication devices 10 and 20 can be mounted on a mobile terminal.

  Next, the reason why End-to-End tunnel communication is possible without a DNS server will be described in detail with reference to FIG. FIG. 2 is a flowchart of the communication method according to the first embodiment. First, the communication modules 11 and 21 are connected to each other through the IP tunnel 31 (step S11). Since fixed IP addresses are allocated to the communication modules 11 and 21, it is possible to connect the communication modules 11 and 21 to each other via the IP tunnel 31 without using a DNS server. The communication module 11 acquires an IP address allocated to the communication module 22 from the communication module 21 via the IP tunnel 31 (step S12).

  The communication module 12 transmits a tunnel connection request to the communication module 22 using the IP address acquired in step S12, thereby connecting the communication modules 12 and 22 to each other through the IP tunnel 32 (step S13). Therefore, the communication modules 12 and 22 can be connected to each other through the IP tunnel 32 without using a DNS server. The mobile communication devices 10 and 20 perform communication via the IP tunnels 31 and 32, so that end-to-end tunnel communication is possible without a DNS server. Note that the IP address assigned to the communication modules 12 and 22 may be either a fixed IP address or a variable IP address.

  For example, the mobile communication devices 10 and 20 can operate as follows. In step S <b> 11, the communication module 11 transmits a tunnel connection request to the communication module 21. The communication module 21 receives the tunnel connection request from the communication module 11 and transmits a tunnel connection response to the communication module 11 in response to the received tunnel connection request. As a result, the communication modules 11 and 21 are connected to each other by the IP tunnel 31.

  In step S <b> 12, the communication module 11 transmits an IP address acquisition request to the communication module 21 via the IP tunnel 31. The communication module 21 receives an IP address acquisition request from the communication module 11 via the IP tunnel 31, and assigns an IP address allocated to the communication module 22 via the IP tunnel 31 in accordance with the received IP address acquisition request. 11 to send. As a result, the communication module 11 acquires an IP address assigned to the communication module 22 from the communication module 21 via the IP tunnel 31.

  In step S13, the communication module 12 transmits a tunnel connection request to the communication module 22 using the IP address acquired in step S12. The communication module 22 receives the tunnel connection request from the communication module 12 and transmits a tunnel connection response to the communication module 12 in response to the received tunnel connection request. As a result, the communication modules 12 and 22 are connected to each other by the IP tunnel 32.

(Embodiment 2)
Next, a mobile communication system, a mobile communication device, and a communication method according to the second embodiment will be described. In the following description, descriptions overlapping with those of the first embodiment may be omitted.

  FIG. 3 is a schematic diagram of the mobile communication system according to the second embodiment. The mobile communication system according to the second embodiment includes mobile communication devices 50 and 60. The mobile communication device 50 corresponds to the mobile communication device 10 according to the first embodiment, and the mobile communication device 60 corresponds to the mobile communication device 20 according to the first embodiment. The mobile communication device 50 is mounted on a terminal that has a plurality of wireless links. The mobile communication device 60 is mounted on a terminal having a plurality of radio links. Hereinafter, a case where a terminal on which the mobile communication device 50 is mounted functions as a client and a terminal on which the mobile communication device 60 is mounted functions as a server will be described. Therefore, the mobile communication device 50 is referred to as a client 50, The mobile communication device 60 is referred to as a server 60.

  The client 50 includes a plurality of communication modules 50-1 to 50 -N, a session management unit 51, a module control / information acquisition unit 52, a packet transfer control unit 53, and a management table 54. The server 60 includes a plurality of communication modules 60-1 to 60 -N, a session management unit 61, a module control / information acquisition unit 62, a packet transfer control unit 63, and a management table 64. The communication modules 50-1 to 50-N and 60-1 to 60-N are wireless communication modules.

  The client 50 and the server 60 communicate with each other via at least one communication carrier 70. More specifically, a plurality of communication modules 50-1 to 50-N included in the client 50 and a plurality of communication modules 60-1 to 60-N included in the server 60 are a plurality of IP tunnels 70-1 to 70-N. Each is connected. The connection through the plurality of IP tunnels 70-1 to 70-N is based on, for example, virtual private network (VPN) technology.

  The session management unit 51 acquires information from the module control / information acquisition unit 52. In addition, the session management unit 51 uses the management table 54 to manage the connection destination IP address, communication carrier, and connection priority.

  The module control / information acquisition unit 52 executes a communication carrier connection instruction and a session connection instruction to the communication modules 50-1 to 50-N. The module control / information acquisition unit 52 acquires the electric field strength of the radio wave received by the communication modules 50-1 to 50-N. The module control / information acquisition unit 52 acquires a communication state of a session executed by the communication modules 50-1 to 50-N and a communication state between the communication modules 50-1 to 50-N and the communication carrier 70. The packet transfer control unit 53 determines a packet transfer interface from among the communication modules 50-1 to 50 -N based on information from the session management unit 51. The packet transfer control unit 53 transfers the packet to the packet transfer interface.

  The session management unit 61 acquires information from the module control / information acquisition unit 62. In addition, the session management unit 61 uses the management table 64 to manage IP address acquisition and communication carrier identification. The session management unit 61 executes load distribution processing.

  The functions of the module control / information acquisition unit 62 and the packet transfer control unit 63 are the same as the functions of the module control / information acquisition unit 52 and the packet transfer control unit 53. Specifically, the module control / information acquisition unit 62 executes a communication carrier connection instruction and a session connection instruction to the communication modules 60-1 to 60-N. The module control / information acquisition unit 62 acquires the electric field strength of the radio wave received by the communication modules 60-1 to 60-N. The module control / information acquisition unit 62 acquires a communication state of a session executed by the communication modules 60-1 to 60-N and a communication state between the communication modules 60-1 to 60-N and the communication carrier 70. The packet transfer control unit 63 determines a packet transfer interface from among the communication modules 60-1 to 60-N based on the information from the session management unit 61. The packet transfer control unit 63 transfers the packet to the packet transfer interface.

  The management table 54 provided in the client 50 will be described with reference to FIG. The management table 54 registers the corresponding connection priority and communication carrier for a plurality of IP addresses. For example, the communication carrier “A” and the connection priority “high” are registered in correspondence with the IP address “xxx.xxx.xxx.xxx”. Corresponding to the IP address “yyy.yyy.yyy.yyy”, the communication carrier “B” and the connection priority “low” are registered. Here, “A” and “B” are names of communication carriers included in the communication carrier 70 and other identifiers.

  The management table 64 provided in the server 60 will be described with reference to FIG. The management table 64 registers corresponding communication carriers for a plurality of IP addresses. For example, the communication carrier “A” is registered corresponding to the IP address “xxx.xxx.xxx.xxx”. Corresponding to the IP address “yyy.yyy.yyy.yyy”, the communication carrier “B” and the like are registered.

  Referring to FIG. 6, a plurality of communication modules 50-1 to 50-N included in client 50 and a plurality of communication modules 60-1 to 60-N included in server 60 are connected to a plurality of IP tunnels 70-1 to 70-N. How to connect each will be explained. A fixed IP address is allocated in advance to the communication modules 50-1 and 60-1.

  Hereinafter, the fixed IP address assigned to the communication module 60-1 is the IP address “xxx.xxx.xxx.xxx”, and the variable IP address assigned to the communication module 60-2 is the IP address “yyy.yyy.yyy.yyy”. Will be described. The client 50 stores the fixed IP address “xxx.xxx.xxx.xxx” allocated to the communication module 60-1 and the corresponding communication carrier “A” in the management table 54 in advance. The server 60 stores the fixed IP address “xxx.xxx.xxx.xxx” assigned to the communication module 60-1 and the corresponding communication carrier “A” in the management table 64 in advance, and further includes the communication module 50- 1 is stored in advance in a storage unit (not shown).

  When the client 50 is activated, the communication module 50-1 executes a dial-up connection to the communication carrier 70. (Step S21). The communication modules 50-2 to 50-N execute dial-up connection with the carrier 70 (step S23). At this time, the carrier 70 allocates a variable IP address to the communication modules 50-2 to 50-N. When the client 60 is activated, the communication module 60-1 performs a dial-up connection to the communication carrier 70 (step S22). The communication modules 60-2 to 60-N execute dial-up connection with the carrier 70 (step S24). At this time, the carrier 70 allocates variable IP addresses to the communication modules 60-2 to 60-N. Here, the variable IP address “yyy.yyy.yyy.yyy” is allocated to the communication module 60-2. The session management unit 61 stores the communication carrier corresponding to the variable IP address allocated to the communication modules 60-2 to 60-N in the management table 64.

  The communication module 50-1 to which the fixed IP address is allocated transmits a tunnel connection request to the communication module 60-1 using the fixed IP address “xxx.xxx.xxx.xxx” (step S25). The communication module 60-1 transmits a tunnel connection response to the communication module 50-1 in response to the tunnel connection request (step S26). Thereby, the communication module 50-1 and the communication module 60-1 are connected by the IP tunnel 70-1 (step S27).

  The communication module 50-1 transmits an IP address acquisition request to the communication module 60-1 via the IP tunnel 70-1 (step S28). In response to the IP address acquisition request, the communication module 60-1 transmits an IP address acquisition response to the communication module 50-1 via the IP tunnel 70-1 (step S29). Here, the IP address acquisition response includes a variable IP address “yyy.yyy.yyy.yyy” allocated to the communication module 60-2 and a communication carrier “B” corresponding to the variable IP address. Accordingly, the communication module 50-1 acquires the variable IP address “yyy.yyy.yyy.yyy” from the communication module 60-1 via the IP tunnel 70-1. The session management unit 51 stores the variable IP address “yyy.yyy.yyy.yyy” assigned to the communication module 60-2 and the corresponding communication carrier “B” in the management table 54.

  The communication module 50-2 transmits a tunnel connection request to the communication module 60-2 using the variable IP address “yyy.yyy.yyy.yyy” (step S30). The communication module 60-2 transmits a tunnel connection response to the communication module 50-2 in response to the tunnel connection request (step S31). Thereby, the communication module 50-2 and the communication module 60-2 are connected by the IP tunnel 70-2 (step S32).

  By repeating the same operations as in steps S28 to S32, the communication modules 50-3 to 50-N and the communication modules 60-3 to 60-N are connected through the IP tunnels 70-3 to 70-N, respectively. The variable IP address assigned to −3 to 60-N and the corresponding communication carrier are stored in the management table 54. Note that the variable IP address allocated to the communication modules 60-3 to 60-N may be acquired via the IP tunnel 70-1, and the installed IP tunnel among the IP tunnels 70-2 to 70-N. May be obtained via

  After the IP addresses assigned to the communication modules 60-1 to 60 -N and the corresponding communication carriers are stored in the management table 54, for example, the user of the terminal provided with the client 50 can store a plurality of items stored in the management table 54. Set the connection priority of the IP address.

  According to the present embodiment, the client 50 and the server 60 are connected to each other by the plurality of IP tunnels 70-1 to 70-N. Therefore, the communication quality can be improved by utilizing the line redundancy function. Furthermore, end-to-end tunnel communication is possible without a DNS server. Therefore, the confidentiality of communication is improved. The communication carriers that provide a plurality of lines each including a plurality of IP tunnels 70-1 to 70-N may have different communication carriers for each line, and some or all of the communication carriers are common. It may be.

  Hereinafter, the improvement of communication quality using the line redundancy function will be described in detail.

  Referring to FIG. 7, client 50 and server 60 communicate using one of a plurality of lines including a plurality of IP tunnels 70-1 to 70 -N, and use the other lines as protection lines. Used as Here, the client 50 refers to the management table 54 and selects a line corresponding to the IP address “xxx.xxx.xxx.xxx” for which the highest connection priority is set. That is, the client 50 and the server 60 communicate using the communication path 81 including the IP tunnel 70-1.

  When the line failure 82 occurs in the communication path 81, the client 50 and the server 60 switch to one of the protection lines and continue communication. Here, the client 50 refers to the management table 54 and selects the line corresponding to the IP address with the highest connection priority set among the IP addresses other than the IP address “xxx.xxx.xxx.xxx”. To do. For example, the client 50 and the server 60 continue communication by switching from the communication path 81 including the IP tunnel 70-1 to the communication path 84 including the IP tunnel 70-N.

  As described above, communication is performed using one of the plurality of lines including the plurality of IP tunnels 70-1 to 70-N, and when a failure occurs in the one line, By switching to this line and continuing communication, communication quality can be improved. Here, when a failure occurs in one line provided by a certain communication carrier, there is a possibility that the communication quality of the other line provided by that communication carrier is also degraded. Therefore, it is preferable that the communication carrier that provides the line before switching is different from the communication carrier that provides the line after switching.

  Further, the client 50 selects the line before switching and the line after switching based on the connection priority in the management table 54. Therefore, it is possible to preferentially select a line considered to have high communication quality. It should be noted that if a plurality of wireless links are simply bundled, an expected communication speed may not be ensured if there are low-speed lines or poor-quality lines among the bundled lines.

  The client 50 and the server 60 communicate using one line among a plurality of lines each including a plurality of IP tunnels 70-1 to 70-N, and use a plurality of lines instead of using other lines as protection lines. Communication may be performed simultaneously using a plurality of lines including IP tunnels 70-1 to 70-N. As a result, load distribution between lines can be achieved, and communication quality can be improved. Furthermore, when a plurality of lines are provided by a plurality of carriers, load distribution among communication carriers can be achieved.

The following patterns (1) to (4) are conceivable as the wireless link connection pattern according to the present embodiment.
(1) Communication of client: server = 1: 1 (2) Communication of client: server = n: 1 (3) Communication of client: server = 1: n (4) Communication of client: server = n: n In the example shown, the client 57 communicates with the servers 67 and 68 via the communication carrier Y. In the example illustrated in FIG. 9, the client 57 communicates with the server 67 via the communication carrier X and communicates with the server 67 via the communication carrier Y. Here, the device configuration of the client 57 is the same as that of the client 50, and the device configuration of the servers 67 and 68 is the same as that of the server 60.

  Since the server is connected to a plurality of clients, the load is expected to increase as the number of connections increases. Therefore, load sharing can be performed by effectively using a plurality of wireless links. The minimum bandwidth can be guaranteed by shaping or rejecting the connection according to the number of lines connected.

(Embodiment 3)
Next, a mobile communication system, a mobile communication device, and a communication method according to the third embodiment will be described. The mobile communication system, the mobile communication device, and the communication method according to the third embodiment are basically the same as the mobile communication system, the mobile communication device, and the communication method according to the second embodiment. In the third form, the connection priority of the management table 54 can be changed. In the following description, descriptions overlapping with those of the second embodiment may be omitted.

  The session management unit 51 of the client 50 according to the third embodiment changes the connection priority of the management table 54 based on the field strength of radio waves received by the communication modules 50-1 to 50-N. For example, the session management unit 51 determines the average value of the electric field intensity of the radio wave received by the communication module 50-1 for a certain period, the average value of the electric field intensity of the radio wave received by the communication module 50-2, The connection priority of the management table 54 is changed based on the average value of the electric field strength of the radio wave received by the communication module 50-N over a certain period.

  When the average value of the electric field intensity of the radio wave received by the communication module 50-1 is decreased and the average value of the electric field intensity of the radio wave received by the communication module 50-2 is increased, FIG. As illustrated, the session management unit 51 changes the connection priority corresponding to the IP address “xxx.xxx.xxx.xxx” from “high” to “low”, and the IP address “yyy.yyy.yyy.yyy”. The connection priority corresponding to is changed from “low” to “high”.

  As a result, the current radio wave reception status of the communication modules 50-1 to 50-N can be reflected on the selection of the line used for communication and the line used when a failure occurs in the line. . The session management unit 51 may periodically change the connection priority of the management table 54 based on the electric field strength of the radio wave, and the initial setting of the connection priority of the management table 54 is set to the electric field strength of the radio wave. May be executed based on

  As another method of changing the connection priority of the management table 54, a method of changing the connection priority of the management table 54 based on the area where the client 50 is currently arranged may be used. This is because the ease of connection with a communication carrier varies depending on the area. In this case, the client 50 includes a connection priority table (not shown) in which connection priorities of a plurality of communication carriers are registered for each area.

  The session management unit 51 of the client 50 receives position information output from a GPS (Global Positioning System) receiver (not shown) included in a terminal provided with the client 50 and the communication modules 50-1 to 50-N from the base station. Based on the signal, the area where the client 50 is currently located is determined. The session management unit 51 changes the connection priority of the management table 54 based on the area where the client 50 is currently arranged and the connection priority table.

  Thereby, the area where the client 50 is currently arranged can be reflected on the selection of the line used for communication and the line used when a failure occurs in the line. The session management unit 51 may periodically change the connection priority of the management table 54 based on the area where the client 50 is currently arranged and the connection priority table, and the connection priority of the management table 54 may be changed. May be executed based on the area where the client 50 is currently arranged and the connection priority table.

  The case where the terminal on which the mobile communication device 50 is mounted functions as a client and the terminal on which the mobile communication device 60 is mounted functions as a server has been described above. The terminal on which the mobile communication device 60 is mounted may function as a client. That is, the device configurations of the mobile communication device 50 and the mobile communication device 60 may be the same.

  Note that the present invention is not limited to the above-described embodiment, and can be changed as appropriate without departing from the spirit of the present invention. For example, the operations of the mobile communication devices 10, 20, 50, 57, 60, 67, and 68 may be realized by a computer executing processing based on a program.

  In the above example, the program can be stored and provided to a computer using various types of non-transitory computer readable media. Non-transitory computer readable media include various types of tangible storage media. Examples of non-transitory computer-readable media include magnetic recording media (for example, flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (for example, magneto-optical disks), CD-ROMs (Read Only Memory), CD-Rs, CD-R / W, semiconductor memory (for example, mask ROM, PROM (Programmable ROM), EPROM (Erasable PROM), flash ROM, RAM (Random Access Memory)). The program may also be supplied to the computer by various types of transitory computer readable media. Examples of transitory computer readable media include electrical signals, optical signals, and electromagnetic waves. The temporary computer-readable medium can supply the program to the computer via a wired communication path such as an electric wire and an optical fiber, or a wireless communication path.

10, 20, 50, 57, 60, 67, 68 Mobile communication devices 11, 12, 21, 22, 50-1 to 50-N, 60-1 to 60-N Communication modules 31, 32, 70-1 70-N IP tunnel 51, 61 Session management unit 52, 62 Module control / information acquisition unit 53, 63 Packet transfer control unit 54, 64 Management table 70 Communication carrier 81, 84 Communication path 82 Line failure

Claims (1)

A plurality of wireless communication modules provided in the first mobile communication device and a plurality of wireless communication modules provided in the second mobile communication device are respectively connected by a plurality of IP tunnels,
The plurality of wireless communication modules included in the first mobile communication device include a first wireless communication module to which a first fixed IP address is allocated,
The plurality of wireless communication modules included in the second mobile communication device include a second wireless communication module to which a second fixed IP address is allocated,
The plurality of wireless communication modules included in the first mobile communication device and the plurality of wireless communication modules included in the second mobile communication device are connected to each other through the plurality of IP tunnels. And connecting the second wireless communication module with a first IP tunnel,
The plurality of wireless communication modules included in the first mobile communication device include a third wireless communication module to which a first variable IP address is allocated,
The plurality of wireless communication modules included in the second mobile communication device includes a fourth wireless communication module to which a second variable IP address is allocated,
Connecting the plurality of wireless communication modules included in the first mobile communication device and the plurality of wireless communication modules included in the second mobile communication device through the plurality of IP tunnels,
The first wireless communication module transmits a first tunnel connection request to the second wireless communication module using the second fixed IP address;
Connecting the first wireless communication module and the second wireless communication module through the first IP tunnel based on the first tunnel connection request;
The first wireless communication module obtains the second variable IP address from the second wireless communication module via the first IP tunnel;
The third wireless communication module transmits a second tunnel connection request to the fourth wireless communication module using the second variable IP address;
The second tunnel connection based on said request third wireless communication module and the fourth including that connects the wireless communication module at the 2IP tunnel
Communication method.

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