JP2009088721A - Inter-network communicating method, notification device, program, and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform such inter-network communication as first communication apparatus in a first network accesses a second communication apparatus in a second network, and the second communication apparatus makes the first communication apparatus access a third communication apparatus in the first network determined by the second communication apparatus without notifying the first communication apparatus of an address assigned individually to the third communication apparatus. <P>SOLUTION: An address mapping table for associating a first address assigned every communication apparatus in a first network with a second address, i.e., the address information in a second network, is stored in a communication apparatus. The communication apparatus searches the address mapping table by using a second address that is input, and extracts a first address associated with the second address. Subsequently, a second communication apparatus in the second network transmits second information including the first address thus extracted through the second network. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a communication technology through a network, and more particularly, to an inter-network communication technology performed between communication devices connected to different networks.

  As a technology for multiple communication devices connected to a private network such as an in-house LAN to share a global address (IP address) and communicate with a communication device connected to the Internet, NAT (Network Address Translation) or NAPT (Network Address Port Translation) (see Non-Patent Document 1, for example). In NAT and NAPT, a private network and the Internet are connected via a NAT device such as a broadband router or a NAPT device, and the NAT device or NAPT device performs address conversion between the private address and the global address, thereby enabling the private network. Communication between the Internet and the Internet.

Further, there is IPv6 (Internet Protocol Version 6) as a next-generation Internet protocol (see, for example, Non-Patent Document 2). In IPv6, the global address has a bit length of 128 bits, and a remarkably large address space can be secured as compared with the conventional IPv4 in which the bit length is only 32 bits. Therefore, in IPv6, addresses in the private network and addresses in the Internet can be managed in an integrated manner. For example, it is possible to manage the allocation of the first 64-bit address information (prefix) of the IPv6 global address to each private network and the second-half 64-bit address information (interface ID) to each communication device in the private network. In this case, inter-network communication between the private network and the Internet can be performed without performing address conversion.
P. Srisuresh, K. Egevang, “RFC3022: Traditional IP Network Address Translator (Traditional NAT)”, [online], January 2001, [searched August 29, 2007], Internet <http: // rfc .net / rfc3022.html> S. Deering, R. Hinden, “RFC2460: Internet Protocol, Version 6 (IPv6) Specification”, [online], December 1998, [searched on August 29, 2007], Internet <http: // rfc .net / rfc2460.html>

  Conventionally, a first communication device in a specific private network accesses a second communication device outside the specific private network, and the second communication device defines the second communication device with respect to the first communication device. When the third communication device in the specific private network is accessed, the second communication device is shared when all communication devices in the specific private network communicate with communication devices outside the specific private network. Both the address and the address individually assigned to the third communication device must be known.

Here, since the address shared by the specific private network is an address used also by the first communication device, it is easy for the first communication device to notify the second communication device of this address. On the other hand, the first communication device may not know the address individually assigned to the third communication device. In this case, the first communication device uses the address individually assigned to the third communication device, It cannot be transmitted to the second communication device.
Such a situation is not only the case where the first communication device and the third communication device exist in the private network and the second communication device exists in a wide area network such as the Internet, but also the first communication device and the third communication device. The communication device exists in the first network, the second communication device exists in the second network, and addresses are individually assigned to the first communication device and the third communication device in the first network. This can occur in an environment where the first communication device and the third communication device are recognized as sharing addresses from the two communication devices.

  The present invention has been made in view of such a point, and the first communication device in the first network accesses the second communication device in the second network, and the second communication device further includes the first communication device. For the communication device, the first communication device knows the address assigned to the third communication device for inter-network communication such as allowing the communication device to access the third communication device in the specific private network determined by the second communication device. An object is to provide a technique that can be executed without any problems.

  In the present invention, in order to solve the above problems, first, the first address assigned to each communication device in the first network and the address information in the second network shared by the communication devices in the first network are provided. An address association table in which the second address is associated with each communication device is stored in the storage unit of the notification device connected in the second network outside the first network (address association table storage process). Next, the second address of the transmission source of the first information transmitted from the first communication device in the first network through the second network is input to the search unit of the notification device. The address association table is searched using the two addresses, and the first address associated with the second address is extracted (search process). Then, the transmission unit of the second communication device in the second network transmits the second information including the first address extracted in the search process through the second network (second information transmission process). This enables access to the third communication device whose destination is specified by the first address.

  As described above, in the present invention, the first communication device in the first network accesses the second communication device existing in the second network, and the second communication device further The communication between networks, which is determined by the two communication devices and allows the third communication device in the specific private network to be accessed, can be executed without knowing the address individually assigned to the third communication device by the first communication device.

The best mode for carrying out the present invention will be described below with reference to the drawings.
[First Embodiment]
First, a first embodiment in the present invention will be described.
This embodiment is an example in which the present invention is applied to communication between networks using NAPT. In this embodiment, a private network such as a LAN is used as the first network, and a wide area network such as the Internet is used as the second network. A global address in the wide area network is used as the first address, and a private address in the private network is used as the second address. For the global address and private address, for example, an IP address conforming to IPv4 is used. In addition, unique information such as a MAC (Media Access Control) address may be used as a private address. Also, a personal computer (hereinafter referred to as “PC”) having a communication function is used as the first communication device, a server device that also serves as the second communication device and the notification device is used, and a mobile phone is used as the third communication device. .

<Configuration>
FIG. 1 is a block diagram illustrating an overall configuration of a communication system 1 according to the first embodiment. 2A is a block diagram showing a functional configuration of the PC 10 in FIG. 1, and FIG. 2B is a diagram showing a functional configuration of the server device 20 in FIG. c) is a diagram showing a functional configuration of the mobile phone 30 of FIG. 1. FIG. 3 is a diagram showing a functional configuration of the NAPT device 40 of FIG. In the following, common parts are denoted by the same reference numerals, and redundant description is omitted.

  As illustrated in FIG. 1, the communication system 1 of the present embodiment includes a PC 10 (first communication device), a server device 20 (second communication device / notification device), a mobile phone 30 (third communication device), NAPT device 40 (connection device). Here, the PC 10 and the mobile phone 30 exist in the private network 2 (first network), and the server device 20 exists in the wide area network 3 (second network). The PC 10 and the mobile phone 30 are configured to be connectable to the server device 20 via the NAPT device 40. In FIG. 1, only one private network 2 connected to the wide area network 3 by the NAPT device 40 is shown for simplification of explanation, but there are a plurality of similar private networks 2 and each private network 2 2 may include a PC 10 and a mobile phone 30.

  Further, as illustrated in FIG. 2A, the PC 10 of this embodiment includes a transmission unit 11, a reception unit 12, a communication processing unit 14, a storage unit 15, and a control unit 17 that controls the PC 10. . The PC 10 is constructed by reading a program such as a predetermined Web browser into a known computer having a communication device such as a LAN card, a CPU (Central Processing Unit), and a RAM (Random Access Memory), and the private network 2 And communication with the wide area network 3 through the NAPT device 40 is possible.

  Further, as illustrated in FIG. 2B, the server device 20 of the present embodiment includes a transmission unit 21, a reception unit 22, a registration processing unit 23, a communication processing unit 24, a storage unit 25, and a search unit. 26 and a control unit 27 that controls the server device 20. The server device 20 is constructed by reading a predetermined program into a communication device capable of communicating with the wide area network 3 or a known computer having a CPU and RAM.

  As illustrated in FIG. 2C, the mobile phone 30 of this embodiment includes a transmission unit 31, a reception unit 32, a registration processing unit 33, a communication processing unit 34, a storage unit 35, and a mobile phone. And a control unit 37 for controlling 30. Note that the mobile phone 30 according to this embodiment has a function of performing communication within the private network 2 and communication with the wide area network 3 through the NAPT device 40, and transmitting from other communication devices within the private network 2. A server function for responding to the received request (for example, HTTP request). As a mobile phone having such a function, for example, “FOMA (registered trademark) M1000 | product | NTT DOCOMO” (reference 1: http://www.nttdocomo.co.jp/product/related/archive/business_model / m1000 /). The mobile phone 30 includes a CPU, a RAM, and the like, and a functional configuration shown in FIG. 2C is constructed by reading a predetermined program into the CPU. The transmission unit 31 and the reception unit 32 are not means for connecting to a mobile network (mobile communication network), but are means for connecting to a private network. Actually, there are means for connecting to a mobile network (mobile communication network), but the description is omitted in the drawing.

  The NAPT device 40 of this embodiment is a broadband router or the like that connects the private network 2 and the wide area network 3. As illustrated in FIG. 3, the NAPT device 40 of this embodiment includes a transmission unit 41 and a reception unit 42 connected to the private network 2, a transmission unit 43 and a reception unit 44 connected to the wide area network 3, and communication. A processing unit 45, a storage unit 46, and a control unit 47 are included.

<Processing>
Next, the inter-network communication method of this embodiment will be described. As a premise of the following processing, the private address (first address) of the PC 10 individually assigned to the PC 10 in the private network 2 is stored in the storage unit 15 of the PC 10 (FIG. 2A), and the private network 2 It is assumed that the private address (first address) of the mobile phone 30 individually assigned to the mobile phone 30 is stored in the storage unit 35 of the mobile phone 30 (FIG. 2C). Further, it is assumed that a global address (second address) individually assigned to the NAPT device 40 in the wide area network 3 is stored in the storage unit 46 of the NAPT device 40 (FIG. 3). Note that the NAPT device 40 originally performs address conversion and port number conversion, but the description of port number conversion will be omitted below.

[registration process]
First, registration processing necessary as preparation for inter-network communication according to this embodiment will be described.
FIG. 5 is a sequence diagram for explaining the registration processing of the first embodiment. Hereinafter, the registration processing of this embodiment will be described with reference to FIG.
First, the registration processing unit 33 of the mobile phone 30 reads the private address of the mobile phone 30 from the storage unit 35, and generates registration request information including the private address of the mobile phone 30 in the header information and the registration request in the payload information. And sent to the communication processing unit 34. The communication processing unit 34 transmits this registration request information from the transmission unit 31 to the NAPT device 40 through the private network 2 (step S1). Note that the header information of the registration request information includes the global address and port number of the server device 20, but the description thereof is omitted here. The registration request information is transmitted as an HTTP request, for example.

  The registration request information is received by the receiving unit 42 of the NAPT device 40 (FIG. 3) and sent to the communication processing unit 45. The communication processing unit 45 performs address conversion of the registration request information, includes the global address (second address) read from the storage unit 46 in the header information as the transmission source address, and the private address (first address of the mobile phone 30 in the payload information). Registration request information including an address) and a registration request. In this process, the storage unit 46 stores the private address (first address) of the mobile phone 30 included in the header information of the registration request information and the global address (second address) newly set as the header information of the registration request information. Address). The address-converted registration request information is transmitted from the transmission unit 43 of the NAPT device 40 to the server device 20 through the wide area network 3 (registration request transmission process / step S2), and received by the server device 20 (FIG. 2B). Received by the unit 22 (registration request receiving process / step S3).

The received registration request information is sent to the registration processing unit 23 via the communication processing unit 24, and the registration processing unit 23 includes the private address (first address) of the mobile phone 30 included in the payload information of the registration request information, The address association table 25a in which the global address (second address) of the transmission source included in the header information is associated is stored in the storage unit 25 of the server device 20 (address association table storage process / step S4).
FIG. 4A is a diagram showing a specific example of the address association table 25a in which the global address (second address) of the transmission source and the private address (first address) of the mobile phone 30 are associated with each other. is there. In the example of FIG. 4A, for the global addresses “129.60.2.1”, “129.60.2.2”, “129.60.2.3” of the source, the private addresses “192.168.1.3”, “192.168.0.1”, “ “192.168.1.1” is associated.

Thereafter, the communication processing unit 24 transmits response information with the destination global address of the transmission source included in the header information of the registration request information as a destination address from the transmission unit 21 to the NAPT device 40 (step S5). This response information is transmitted as an HTTP response, for example.
The transmitted response information is received by the receiving unit 44 of the NAPT device 40 and sent to the communication processing unit 45. The communication processing unit 45 performs address conversion of the response information using the address correspondence stored in the storage unit 46 (step S6), and transmits the response information subjected to the address conversion from the transmission unit 41 to the mobile phone 30. And the receiving part 32 of the mobile telephone 30 receives this response information, and a registration process is complete | finished (step S7).

  The above registration process may be executed at an arbitrary frequency and at an arbitrary timing. However, when the mobile phone 30 (third communication device) is connected to the private network 2 (first network) for the first time, or Whenever the mobile phone 30 (third communication device) is connected to the private network 2 (first network) or when a new private address (first address) is assigned to the mobile phone 30 (third communication device). It is desirable to be executed. This is because the latest address association table 25 a can be registered in the server device 20. Such a procedure is particularly effective when a private address is dynamically assigned to the mobile phone 30.

[Service Usage Processing]
The PC 10 (first communication device) in the private network 2 accesses the server device 20 (second communication device) outside the specific private network 2, and the server device 20 (second communication device) is further connected to the PC 10 (second communication device). A service usage process for allowing the first communication device) to access the mobile phone 30 (third communication device) in the specific private network 2 defined by the server device 20 (second communication device) will be described.
FIG. 6 is a sequence diagram for explaining service use processing according to the first embodiment. Hereinafter, the service use processing of this embodiment will be described with reference to FIG.

  First, the communication processing unit 14 of the PC 10 (first communication device) (FIG. 2A) reads the private address (first address) of the PC 10 from the storage unit 15, includes the private address of the PC 10 in the header information, and the payload Service request information including a service request in the information is generated. The generated service request information is transmitted from the transmission unit 11 to the NAPT device 40 (step S11). The header information of the service request information includes the port number, the global address of the server device 20, and the like, but the description thereof is omitted here. The service request information is transmitted as an HTTP request, for example.

  The transmitted service request information is received by the receiving unit 42 of the NAPT device 40 (FIG. 3) and sent to the communication processing unit 45. The communication processing unit 45 performs address conversion of the transmitted service request information, includes the global address (second address) stored in the storage unit 46 in the header information as the transmission source address, and includes the service request in the payload information. Generate service request information. In this process, the storage unit 46 stores the private address (first address) of the PC 10 included in the header information of the service request information and the global address (second address) newly set as the header information of the service request information. Are associated with each other. The address-converted service request information (first information) is transmitted from the transmission unit 43 to the server device 20 through the wide area network 3 (second network) (step S12), and the server device 20 (FIG. 2B) Received by the receiving unit 22 (step S13).

The service request information (first information) received by the receiving unit 22 is sent to the communication processing unit 24, and the communication processing unit 24 uses the global address (second address) of the transmission source included in the header information of the service request information. The data is sent to the search unit 26. The search unit 26 searches the address association table 25a stored in the storage unit 25 using the input global address (second address), and the mobile phone 30 associated with the global address (second address). The private address (first address) is extracted (search process / step S14).
The extracted private address (first address) of the mobile phone 30 is sent to the communication processing unit 24 together with the global address (second address) of the NAPT device 40 used for the search. The communication processing unit 24 generates response information (second information) including the private address (first address) of the sent mobile phone 30 and including the global address (second address) as the destination address in the header information.

  FIGS. 4B to 4E are diagrams illustrating a method of storing the private address (first address) of the mobile phone 30 in the response information (second information). Hereinafter, these storage methods will be described.

<< Address Storage Method 1 >> The private address (first address) is included in the HTTP header information (Location: header) of the response information (second information) (FIG. 4B).
<< Address Storage Method 2 >> A private address (first address) is included in a <HEAD> tag of an HTML document or the like which is payload information of response information (second information) (FIG. 4C).

<< Address Storage Method 3 >> An anchor tag including a private address (first address) is described in the body of an HTML document or the like which is payload information of response information (second information) (FIG. 4 (d)).
<< Address Storage Method 4 >> A Java (registered trademark) Script including a private address (first address) in the <body> portion of the body of an HTML document or the like which is payload information of response information (second information) is described (FIG. 4). (E)).

  The response information (second information) generated by the communication processing unit 24 is sent to the transmission unit 21. The transmission unit 21 transmits the response information (second information) to the NAPT device through the wide area network 3 (second network). 40 (second information transmission process / step S15). The response information (second information) is transmitted as, for example, an HTTP response.

  The transmitted response information is received by the receiving unit 44 of the NAPT device 40 (FIG. 3) and sent to the communication processing unit 45. The communication processing unit 45 converts the address of the response information, and replaces the global address, which is the destination address included in the header information of the response information, with the private address of the PC 10 associated with the storage unit 46 (step S16). The response information (second information) converted in this way is transmitted from the transmission unit 41 and received by the reception unit 12 of the PC 10 (first communication device) through the private network 2 (second information reception process / step). S17).

  This response information (second information) is sent to the communication processing unit 14 of the PC 10 (FIG. 2A). The communication processing unit 14 sends the private network 2 (first communication device) from the transmission unit 11 to the mobile phone 30 (third communication device) specified by the private address (first address) of the mobile phone included in the response information (second information). Service request information (third information) is transmitted through (1 network) (third information transmission process / step S18). Hereinafter, a specific example of the third information transmission process (step S18) according to the address storage methods 1 to 4 will be described.

<< In the Case of Address Storage Method 1 (FIG. 4B) >> The transmission unit 11 transmits service request information (third information) by an HTTP redirect response with a private address (first address) as a redirect destination.
<< In the case of the address storage method 2 (FIG. 4C) >> The transmission unit 11 transmits service request information (third information) to the <HEAD> tag toward the private address (first address).
<< In the case of the address storage method 3 (FIG. 4 (d)) >> When the link displayed on the PC 10 is clicked, the transmission unit 11 sends service request information (third information) toward the private address (first address). Send.
<< In the case of the address storage method 4 (FIG. 4 (e)) >> When the Java (registered trademark) script is driven, the transmission unit 11 sends service request information (third information) to the private address (first address). Send.

  The transmitted service request information (third information) is received by the receiving unit 32 of the mobile phone 30 (FIG. 2C) and sent to the communication processing unit 34 (step S19). The communication process part 34 produces | generates the response information, and transmits from the transmission part 31 (step S20). This response information is received by the receiving unit 12 of the PC 10 (FIG. 2A) through the private network 2 (step S21). Note that a Java (registered trademark) application functioning as an HTTP server can be mounted on the mobile phone described in the above-mentioned reference document. When the mobile phone 30 is constructed using this mobile phone, the PC 10 can use the service of the HTTP server operating on the mobile phone 30 after connecting to the mobile phone 30.

<Features of this embodiment>
As described above, in this embodiment, the private address (first address) assigned to each mobile phone 30 (communication device) in the private network 2 (first network) and the private network 2 (first network) Address correspondence table in which a global address (second address) in the wide area network 3 (second network) shared by the PC 10 and the mobile phone 30 (communication device) is associated with each mobile phone 30 (communication device). 25a is stored in the storage unit 25 of the server device 20 (notification device) connected in the wide area network 3 (second network) outside the private network 2 (first network) (step S4), and the server device 20 ( The search unit 26 of the notification device is connected to the private network 2 (first network). Address) using the global address (second address) of the transmission source of the service request information (first information) transmitted from the PC 10 (first communication device) in the network) through the wide area network 3 (second network). The table 25a is searched, the private address (first address) of the mobile phone 30 associated with the global address (second address) is extracted (step S14), and the server in the wide area network 3 (second network) is extracted. The transmission unit 21 of the device 20 (second communication device) sends the response information (second information) including the private address (first address) of the mobile phone 30 extracted in step S14 to the wide area network 3 (second network). ) (Step S15). Thereby, the PC 10 can access the mobile phone 30 without knowing the private address of the mobile phone 30 in advance.

  In the present embodiment, the response information (second information) transmitted from the server device 20 (second communication device) in step S15 is received by the receiving unit 12 of the PC 10 (first communication device) (step S17). Service request information is sent from the transmitting unit 11 to the mobile phone 30 (third communication device) specified by the private address (first address) included in the response information (second information) through the private network 2 (first network). (Third information) is transmitted (step S19). As a result, the NAPT can be passed from the server device 20 side in the global address (second address) to the mobile phone 30 (third communication device) in the private network 2 (first network) where no connection is established. Become.

  In addition, the registration processing (steps S1 to S7) of the present embodiment is such that the mobile phone 30 (third communication device) itself sends the private address (first address) to the server device 20 via the NAPT device 40 without the PC 10 intervening. Done by sending. Therefore, the PC 10 can access the mobile phone 30 without being involved in the private address of the mobile phone 30 in advance.

<Modification of First Embodiment>
Note that the present invention is not limited to the first embodiment.
For example, in the first embodiment, the server device 20 is configured to serve as both the second communication device and the notification device. However, the second communication device and the notification device may be configured separately. Moreover, the structure which a some 2nd communication apparatus shares a notification apparatus may be sufficient. This eliminates the need to create and manage duplicate address association tables, improving the efficiency of the entire system.
FIG. 7 is an illustration of the communication system 101 in which two server devices 150-1 and 150-2 that are second communication devices share one notification device 120.

  In this example, a wide area network 103 in which two server devices 150-1 and 150-2 and one notification device 120 exist is connected to the NAPT device 40. Then, instead of step S14 described above, the global address (second address) of the transmission source included in the service request information (first information) received by the server device 150-1 or 150-2 is sent to the notification device 120. The notification device 120 searches the address association table 25a stored in the storage unit 25 using the sent global address (second address), and the cellular phone associated with the global address (second address). 30 private addresses (first addresses) are extracted and returned to the server apparatus 150-1 or 150-2.

In the first embodiment, an example in which the PC 10 (first communication device) and the mobile phone 30 (third communication device) communicate with the wide area network 3 via the NAPT device 40 has been described. The communication device may be configured to also serve as a NAPT device.
FIG. 8 is an illustration of the communication system 201 when a PC (first communication device) also serves as a NAPT device. In this case, the PC 210 (first communication device) directly performs communication with the server device 20 in the wide area network 3 and communication with the mobile phone 30 in the private network 202. Other processes are the same as those in the first embodiment.

Further, the PC (first communication device) may have the function of a NAPT device, and the second communication device and the notification device may be separately configured to configure a communication system. FIG. 9 is an illustration of a communication system 301 in which a PC (first communication device) also serves as a NAPT device, and two server devices 150-1 and 150-2 that are second communication devices share one notification device 120. is there.
In the first embodiment, communication between the private network and the global network is performed using NAPT. However, a configuration using NAT may be used. In that case, a NAT device is used instead of the NAPT device. In the first embodiment, an example is shown in which a PC is used as the first communication device and a mobile phone is used as the third communication device. However, a mobile phone, a PDA, or the like may be used as the first communication device, and a PC, a PDA, or the like may be used as the third communication device. The same applies to these points and the modified examples of FIGS.

[Second Embodiment]
In this embodiment, a plurality of third communication devices exist in one private network, and the third communication device accessed by the first communication device can be selected. Below, it demonstrates centering around difference with 1st Embodiment, and abbreviate | omits description about the matter which is common in 1st Embodiment.

<Configuration>
FIG. 10 is a block diagram illustrating an overall configuration of a communication system 401 according to the second embodiment. FIG. 11A is a block diagram showing the functional configuration of the PC 410 in FIG. 10, and FIG. 11B is a diagram showing the functional configuration of the server device 420 in FIG. c) is a diagram showing a functional configuration of the mobile phone 430 of FIG.

  As illustrated in FIG. 10, the communication system 401 of this embodiment includes a PC 410 (first communication device), a server device 420 (second communication device / notification device), and mobile phones 430-1 and 430-2 (first communication device). 3 communication devices) and a NAPT device 40 (connection device). Here, the PC 410 and the cellular phones 430-1 and 430-2 exist in the private network 402 (first network), and the server apparatus 420 exists in the wide area network 403 (second network). The PC 410 and the mobile phones 430-1 and 430-2 are configured to be connectable to the server device 420 via the NAPT device 40.

In FIG. 10, only one private network 402 connected to the wide area network 403 by the NAPT device 40 is shown for simplification of explanation, but there are a plurality of similar private networks 402, and each private network A configuration in which a PC and a mobile phone exist in 402 may be used. In addition, a configuration in which three or more mobile phones exist in the private network 402 may be used.
In addition, hereinafter, when the matters common to the mobile phones 430-1 and 430-2 are described, the description will be made as the mobile phone 430.

Moreover, as illustrated in FIG. 11A, the PC 410 of this embodiment includes a transmission unit 11, a reception unit 12, a communication processing unit 14, a storage unit 15, a control unit 17, an input unit 418, And an output unit 419. The only difference in configuration from the PC 10 of the first embodiment is that it has an input unit 418 and an output unit 419.
Further, as illustrated in FIG. 11B, the server apparatus 420 of the present embodiment includes a transmission unit 21, a reception unit 22, a registration processing unit 23, a communication processing unit 24, a storage unit 25, and a search unit. 426 and a control unit 27 that controls the server device 20. The difference in configuration from the server device 20 of the first embodiment is only the configuration of the address association table 425a stored in the storage unit 25 and the search unit 426.

  Further, as illustrated in FIG. 11C, the mobile phone 430 of this embodiment includes a transmission unit 31, a reception unit 32, a registration processing unit 33, a communication processing unit 34, a storage unit 35, and a mobile phone. And a control unit 37 for controlling 30. The only difference in configuration from the mobile phone 30 of the first embodiment is that each account name (identification information) is stored in the storage unit 35.

<Processing>
Next, the inter-network communication method of this embodiment will be described. As a premise of the following processing, the private address (first address) of the PC 410 individually assigned to the PC 410 in the private network 402 is stored in the storage unit 15 of the PC 410 (FIG. 11A), and the private network 402 The private addresses (first addresses) and account names (identification information) of the mobile phones 430-1 and 430-2 individually assigned to the mobile phones 430-1 and 430-2 are mobile phones 430-1 and 430, respectively. -2 storage unit 35 (FIG. 11C).

[registration process]
First, registration processing necessary as preparation for inter-network communication according to this embodiment will be described.
FIG. 13 is a sequence diagram for explaining the registration processing of the second embodiment. Hereinafter, the registration processing of this embodiment will be described with reference to FIG.
First, the registration processing unit 33 of each mobile phone 430 (FIG. 11C) reads the private address and account name of the mobile phone 430 from the storage unit 35, includes the private address of the mobile phone 430 in the header information, and payload information Registration request information including an account name and a registration request is generated and sent to the communication processing unit 34. The communication processing unit 34 transmits this registration request information from the transmission unit 31 to the NAPT device 40 through the private network 402 (step S51).

  The registration request information is received by the NAPT device 40. The NAPT device 40 converts the registration request information in the same manner as in the first embodiment, includes the global address (second address) in the header information as the transmission source address, and the private address (first address) of the mobile phone 430 in the payload information. ), An account name (identification information), and a registration request information are generated. The address-converted registration request information is transmitted to the server apparatus 420 through the wide area network 403 (registration request transmission process / step S52) and received by the receiving unit 22 of the server apparatus 420 (FIG. 11B) (registration). Request reception process / step S53).

The received registration request information is sent to the registration processing unit 23 via the communication processing unit 24, and the registration processing unit 23 includes the private address (first address) of the mobile phone 430 included in the payload information of the registration request information, An address association table 425a in which the account name (identification information) is associated with the global address (second address) of the transmission source included in the header information is stored in the storage unit 25 of the server device 420 (address association table storage). Process / step S54).
FIG. 12A shows an address correspondence table 125a in which a global address (second address) of a transmission source, a private address (first address) of a mobile phone 430, and an account name (identification information) are associated with each other. It is the figure which showed the specific example. In the example of FIG. 12A, two account names “taro” and “hanako” are associated with the global address “129.60.2.1” of the source, and the global address “129.60.2.2” of the source is One account name “ichiro” is associated, and the account names “taro” and “hanako” are associated with the mobile phone private addresses “192.168.1.3” and “192.168.1.4” respectively. On the other hand, the mobile phone private address “192.168.0.1” is associated.

Thereafter, the same processing as steps S5 to S7 of the first embodiment is performed (steps S55 to 57), and the registration processing is completed.
The registration process of this embodiment may be executed at an arbitrary frequency and at an arbitrary timing. However, when the mobile phone 430 (third communication device) is connected to the private network 402 (first network) for the first time, Alternatively, whenever the mobile phone 430 (third communication device) is connected to the private network 402 (first network), or a new private address (first address) is assigned to the mobile phone 430 (third communication device). It is desirable to be executed every time. This is because the latest address association table 425a can be registered in the server device 420. Such a procedure is particularly effective when a private address is dynamically assigned to the mobile phone 430.

[Service Usage Processing]
14 and 15 are sequence diagrams for explaining service use processing according to the second embodiment. Hereinafter, the service use processing of this embodiment will be described with reference to FIGS.
First, the communication processing unit 14 of the PC 410 (first communication device) (FIG. 11A) reads the private address (first address) of the PC 410 from the storage unit 15, includes the private address of the PC 410 in the header information, and the payload Service request information including a service request in the information is generated. The generated service request information is transmitted (for example, an HTTP request) from the transmission unit 11 to the NAPT device 40 (step S61).

  The transmitted service request information is received by the NAPT device 40, and address conversion is performed as in the first embodiment. Thereby, service request information including the global address (second address) as the transmission source address in the header information and the service request in the payload information is generated. The address-converted service request information (first information) is transmitted to the server device 420 through the wide area network 403 (second network) (step S62), and is received by the receiving unit 22 of the server device 420 (FIG. 11B). Received (step S63).

The service request information (first information) received by the reception unit 22 is sent to the communication processing unit 24, and the communication processing unit 24 sends the global address of the transmission source included in the header information of the service request information to the search unit 426. . The search unit 426 searches the address association table 425a stored in the storage unit 25 using the input global address, and extracts the account name of the mobile phone 430 associated with the global address (step S64). . At this time, a plurality of account names may be extracted.
The extracted account name is sent to the communication processing unit 24, and the communication processing unit 24 generates selection instruction information including list information of mobile phones corresponding to the extracted account name. The generated selection instruction information is sent to the transmission unit 21, and is transmitted from there as response information (for example, HTTP response) of the service request information received in step S63 (step S65).

The transmitted selection instruction information is address-converted by the NAPT device 40 (step S 66), then transmitted to the PC 410 (FIG. 11A) (first communication device) through the private network 402 and received by the receiving unit 12. (Step S67). The received selection instruction information is sent to the communication processing unit 14, and the communication processing unit 14 sends the mobile phone list information included in the selection instruction information to the output unit 419, and the output unit 419 outputs it (step S68). .
FIG. 12B is a diagram exemplifying the mobile phone list information output in this way. In this example, a message “Please select a mobile phone you want to use” and click buttons 419aa and 419ab of the account name “taro” [hanako] corresponding to each mobile phone are displayed.

  The user who has viewed the mobile phone list information inputs the mobile phone selection information to the input unit 418 (step S69). In the example of FIG. 12B, the user clicks on the click button 419aa or 419ab of the account name “taro” [hanako] and selects the selection information for specifying the account name (identification information) corresponding to one of the mobile phones. input. This selection information is sent to the communication processing unit 14. The communication processing unit 14 reads the private address (first address) of the PC 410 from the storage unit 15, includes the private address of the PC 410 in the header information, and the account name (identification information) and service request indicated in the selection information in the payload information. Generate selection information including. The generated selection information is transmitted (for example, an HTTP request) from the transmission unit 11 to the NAPT device 40 (step S70).

  The transmitted selection information is received by the NAPT device 40, and address conversion is performed in the same manner as the service request information of the first embodiment. Thereby, selection information including the global address (second address) as the transmission source address in the header information and the account name (identification information) in the payload information is generated. The address-converted selection information (first information) is transmitted to the server device 420 through the wide area network 403 (second network) (step S71) and received by the receiving unit 22 of the server device 420 (FIG. 11B). (Step S72).

The selection information (first information) received by the receiving unit 22 is sent to the communication processing unit 24, and the communication processing unit 24 includes the global address (second address) of the transmission source included in the header information of the service request information, The account name (identification information) included in the payload information is sent to the search unit 426. The search unit 426 uses the input global address (second address) and account name (identification information) to search the address association table 425a stored in the storage unit 25, and the global address (second address). And the private address (first address) of the mobile phone 430 associated with the account name (identification information) is extracted (search process / step S73).
Thereafter, the same processing as steps S15 to S20 of the first embodiment is executed (steps S74 to S80).

<Features of this embodiment>
As described above, in this embodiment, the private address (first address) and account name (identification information) assigned to each mobile phone 430 (communication device) in the private network 402 (first network), and the private network 402 For each mobile phone 430 (communication device), a global address (second address) in the wide area network 403 (second network) shared by the PC 410 and the mobile phone 430 (communication device) in the (first network). The associated address association table 425a is stored in the storage unit 25 of the server device 420 (notification device) connected in the wide area network 403 (second network) outside the private network 402 (first network) (step S40). S54), server device 42 The search unit 426 of the (notification device) transmits selection information (first information) transmitted from the PC 410 (first communication device) in the private network 402 (first network) through the wide area network 403 (second network). Using the account name (identification information) included in the original global address (second address) and selection information (first information), the address association table 425a is searched, and the global address (second address) and account name ( The private address (first address) of the mobile phone 430 associated with the identification information) is extracted (step S73), and the transmission unit of the server device 420 (second communication device) in the wide area network 403 (second network) 21 is the ply of the mobile phone 30 extracted in step S73. The over preparative address (first address) response information including the (second information), it was decided to transmit (step S74) through the wide area network 403 (second network). Thereby, the PC 410 can access the selected mobile phone 430 without knowing the private address of the mobile phone 430 in advance.

Further, in this embodiment, the NAPT can be exceeded by the processing in steps S74 to S80 similar to the first embodiment.
Further, in the registration processing (steps S51 to S57) of this embodiment, the mobile phone 430 (third communication device) itself sends a private address (first address) to the server device 420 via the NAPT device 40 without the PC 410 intervening. Done by sending. Therefore, the PC 410 can access the selected mobile phone 430 without being involved in the private address of the mobile phone 430 in advance.

<Modification of Second Embodiment>
The present invention is not limited to the second embodiment.
For example, when the user inputs selection information of the mobile phone (account name) to the input unit 418 of the PC 410 in step S69, the server apparatus 420 inputs a password or the like to the PC 410, and the user enters the mobile phone (account It may be configured to authenticate whether there is an authority to select (name).
In the second embodiment, the server device 420 serves as both the second communication device and the notification device. However, the second communication device and the notification device may be configured separately. Moreover, the structure which a some 2nd communication apparatus shares a notification apparatus may be sufficient. This eliminates the need to create and manage duplicate address association tables, improving the efficiency of the entire system.

In the second embodiment, the PC 410 (first communication device) and the mobile phone 430 (third communication device) communicate with the wide area network 403 via the NAPT device 40. However, the PC 410 (first communication device) The communication device may be configured to also serve as a NAPT device.
Further, the PC (first communication device) may have the function of a NAPT device, and the second communication device and the notification device may be separately configured to configure a communication system.
In the second embodiment, communication between the private network and the global network is performed using NAPT. However, a configuration using NAT may be used. In that case, a NAT device is used instead of the NAPT device.

In the second embodiment, the account name is used as the identification information of the mobile phone (third communication device). However, as the identification information of the mobile phone (third communication device), a telephone number, a mail address, or a MAC (Media Access) is used. Control) Address or other information that uniquely identifies the mobile phone may be used. In the second embodiment, an example in which a PC is used as the first communication device and a mobile phone is used as the third communication device has been described. However, a mobile phone, a PDA, or the like may be used as the first communication device, and a PC, a PDA, or the like may be used as the third communication device.
[Third Embodiment]
This embodiment is a modification of the second embodiment, and uses an IPv6 address compliant with IPv6 as an address. In this embodiment, a common IPv6 address prefix is assigned to each private network (for example, a private network using a single line contracted with a provider), and each communication device in the private network has the same prefix and has a different interface. An IPv6 address having an ID is assigned. For example, an IPv6 address from 2001: 1: 2: 4: 0: 0: 0: 0 to 2001: 1: 2: 4: ffff: ffff: ffff: ffff is assigned to one private network and another private network is assigned. IPv6 addresses 2001: 1: 2: 5: 0: 0: 0: 0 to 2001: 1: 2: 5: ffff: ffff: ffff: ffff are assigned to the network, and communication devices in each private network Uses the IPv6 address assigned to the private network. Then, the IPv6 address prefix is used as the first address, and the interface ID is used as the second address.

  Below, it demonstrates centering around difference with 1st, 2 embodiment, and abbreviate | omits description about the matter which is common in 1st, 2 embodiment.

<Configuration>
FIG. 16 is a block diagram illustrating an overall configuration of a communication system 701 according to the third embodiment. FIG. 17A is a block diagram showing the functional configuration of the PC 710 in FIG. 16, and FIG. 17B is a diagram showing the functional configuration of the server device 720 in FIG. c) is a diagram showing a functional configuration of the mobile phone 730 of FIG.

  As illustrated in FIG. 17, the communication system 701 of this embodiment includes PCs 710-1 and 710-2 (first communication device), a server device 720 (second communication device / notification device), and a mobile phone 730-1. To 3 (third communication device) and router devices 740-1 and 740-2 (connection device). Here, the PC 710-1 and the mobile phones 730-1 and 730-2 exist in the private network 702-1 (first network), and the PC 710-2 and the mobile phone 730-3 are in the private network 702-2 ( The server device 720 exists in the wide area network 703 (second network). The PC 710-1 and the mobile phones 730-1 and 730-2 are configured to be connectable to the server device 720 via the router device 740-1, and the PC 710-2 and the mobile phone 730-3 are connected to the router device 740-. 2 is configured to be connectable to the server device 720 via the network.

In FIG. 16, only two private networks are shown for the sake of simplification, but there are a plurality of similar private networks, and a configuration in which a PC and a mobile phone exist in each private network. Good.
In addition, hereinafter, when explaining matters common to the PCs 710-1 and 710-2, explanation will be given as the PC 710, and when explaining matters common to the mobile phones 730-1 and 730-2, When the description is given as the telephone 730 and the items common to the router devices 740-1 and 740-2 are described, the description is given as the router device 740.

Moreover, as illustrated in FIG. 17A, the PC 710 of this embodiment includes a transmission unit 11, a reception unit 12, a communication processing unit 14, a storage unit 15, a control unit 17, an input unit 418, And an output unit 419. The only difference in configuration from the PC 410 of the second embodiment is that the address stored in the storage unit 15 is an IPv6 address.
As illustrated in FIG. 17B, the server device 720 of this embodiment includes a transmission unit 21, a reception unit 22, a registration processing unit 23, a communication processing unit 24, a storage unit 25, and a search unit. 726 and a control unit 27 that controls the server device 20. The difference in configuration from the server device 420 of the second embodiment is only the configuration of the address association table 725 a stored in the storage unit 25 and the search unit 726.

  Further, as illustrated in FIG. 17C, the mobile phone 730 of this embodiment includes a transmission unit 31, a reception unit 32, a registration processing unit 33, a communication processing unit 34, a storage unit 35, and a mobile phone. And a control unit 37 for controlling 30. The only difference in configuration from the mobile phone 430 of the second embodiment is that the address stored in the storage unit 35 is an IPv6 address.

<Processing>
Next, the inter-network communication method of this embodiment will be described. As a premise of the following processing, the IPv6 address individually assigned to each PC 710 is stored in the storage unit 15 of the PC 710 (FIG. 17A), and the IPv6 address and account name individually assigned to the mobile phone 730 are stored. It is assumed that (identification information) is stored in the storage unit 35 of the mobile phone 730 (FIG. 17C). As described above, IPv6 addresses having the same prefix and different interface IDs are assigned to the mobile phones 730-1 and 730-2 and the PC 710-1 in the private network 702-1. Further, IPv6 addresses having the same prefix and different interface IDs are respectively assigned to the mobile phone 730-3 and the PC 710-2 in the private network 702-2. Also, the IPv6 address prefix of the mobile phones 730-1, 730-2 and PC 710-1 is different from the IPv6 address prefix of the mobile phones 730-3 and PC 710-2. Further, the prefix of each IPv6 address corresponds to the second address, and the interface ID corresponds to the first address.

[registration process]
First, registration processing necessary as preparation for inter-network communication according to this embodiment will be described.
FIG. 19 is a sequence diagram for explaining a registration process according to the second embodiment. Hereinafter, the registration processing of this embodiment will be described with reference to FIG.
First, the registration processing unit 33 of each mobile phone 730 (FIG. 17C) reads the IPv6 address and account name of the mobile phone 730 from the storage unit 35, includes the IPv6 address of the mobile phone 730 in the header information, and payload information Registration request information including an account name and a registration request is generated and sent to the communication processing unit 34. The communication processing unit 34 transmits this registration request information from the transmission unit 31 to the router device 740 through the private network 702 (step S101).

The router device 740 transmits the transmitted registration request information to the server device 720 through the wide area network 703 (step S102), and the transmitted registration request information is received by the receiving unit of the server device 720 (FIG. 17B). 22 (registration request reception process / step S103).
The received registration request information is sent to the registration processing unit 23 via the communication processing unit 24, and the registration processing unit 23 includes an IPv6 address (prefix (second address) + interface ID (included in the header information of the registration request information). 1st address)) and the account name (identification information) of the mobile phone 730 included in the payload information are stored in the storage unit 25 of the server device 720 (address association table storage). Process / step S104). That is, the address association table 725a is a table in which a prefix (second address), an interface ID (first address), and an account name (identification information) are associated with each other.

  FIG. 18 is a diagram illustrating a specific example of an address association table 725a in which an IPv6 address (prefix (second address) + interface ID (first address)) and an account name (identification information) are associated with each other. In the example of FIG. 18, two different prefixes (second addresses) “2001: 1: 2: 4:” and the same interface ID (first address) “...: 3” “...: 4” are different. IPv6 addresses “2001: 1: 2: 4:…: 3” “2001: 1: 2: 4:…: 4” and two account names “taro” and “hanako” are associated with each other, and the prefix (second address ) Is "2001: 1: 2: 5:" and interface ID (first address) is "...: 2" IPv6 address "2001: 1: 2: 5: ...: 2" and account name "ichiro" are supported It is attached.

Thereafter, the response information is transmitted from the server device 720 to the router device 740 and the mobile phone 730 and received by the mobile phone 730, and the registration process is completed.
The registration process of this embodiment may be executed at an arbitrary frequency and at an arbitrary timing. However, when the mobile phone 730 (third communication device) is connected to the private network 702 (first network) for the first time, Alternatively, each time the mobile phone 730 (third communication device) is connected to the private network 702 (first network), or a new private address (first address) is assigned to the mobile phone 730 (third communication device). Each time, it is desirable that each mobile phone 730 be executed. This is because the latest address association table 725a can be registered in the server device 720. Such a procedure is particularly effective when a private address is dynamically assigned to the mobile phone 730.

[Service Usage Processing]
20 and 21 are sequence diagrams for explaining the service use processing of the second embodiment. Hereinafter, the service use processing of this embodiment will be described with reference to FIGS.
First, the communication processing unit 14 of the PC 710 (first communication device) (FIG. 17A) reads the IPv6 address (second address + first address) of the PC 710 from the storage unit 15 and includes the IPv6 address in the header information. The service request information including the service request in the payload information is generated. The generated service request information is transmitted (for example, HTTP request) from the transmission unit 11 to the router device 740 (step S111).

The transmitted service request information is received by the router device 740, transmitted to the server device 720 through the wide area network 703 (second network) (step S112), and the receiving unit 22 of the server device 720 (FIG. 17B). (Step S113).
The service request information (first information) received by the receiving unit 22 is sent to the communication processing unit 24, and the communication processing unit 24 sends the IPv6 address (second address + second) of the transmission source included in the header information of the service request information. 1 address) to the search unit 726. The search unit 726 uses the prefix (second address) of the input IPv6 address (second address + first address) to search the address association table 725a stored in the storage unit 25 and corresponds to the prefix. The account name of the mobile phone 730 is extracted (step S114). At this time, a plurality of account names may be extracted.

Next, processing similar to steps S65 to S69 of the second embodiment is executed (steps S115 to S119).
Thereafter, the selection information input in step S119 is sent to the communication processing unit 14 of the PC 710 (FIG. 17A). The communication processing unit 14 reads the IPv6 address (second address + first address) of the PC 710 from the storage unit 15, includes the IPv6 address (second address + first address) of the PC 710 in the header information, and selection information in the payload information. The selection information including the account name (identification information) and the service request shown in FIG. The generated selection information (first information) is transmitted (for example, an HTTP request) from the transmission unit 11 to the router device 740 (step S120).

The transmitted selection information (first information) is received by the router device 740, transmitted to the server device 720 through the wide area network 703 (second network) (step S121), and the server device 720 (FIG. 17B). Is received by the receiver 22 (step S122).
The selection information (first information) received by the receiving unit 22 is sent to the communication processing unit 24, and the communication processing unit 24 sends the IPv6 address of the transmission source (second address + first) included in the header information of the service request information. Address) and the account name (identification information) included in the payload information are sent to the search unit 726. The search unit 726 uses the prefix (second address) of the input IPv6 address (second address + first address) and the account name (identification information) to search the address association table 725a stored in the storage unit 25. The search is performed and the IPv6 address (second address + first address) of the mobile phone 730 corresponding to the prefix (second address) and the account name (identification information) is extracted (search process / step S123).

  Thereafter, the extracted IPv6 address (second address + first address) of the mobile phone 730 is sent to the communication processing unit 24 together with the IPv6 address of the transmission source of the service request information used for the search. The communication processing unit 24 includes the IPv6 address (second address + first address) of the transmitted mobile phone 30 and response information (second information) including the IPv6 address of the transmission source of the service request information as the destination address of the header information. ) Is generated. The response information (second information) is sent to the transmission unit 21, and the transmission unit 21 transmits the response information (second information) to the router device 740 through the wide area network 703 (second network) (second information). Transmission process / step S124). The response information (second information) is transmitted as, for example, an HTTP response.

  The transmitted response information is received by the router device 740 (step S125), and is received by the receiving unit 12 of the same PC 710 (FIG. 17A) (first communication device) as that of step S111 through the private network 702 (first communication device). 2 Information reception process / step S126). This response information (second information) is sent to the communication processing unit 14. The communication processing unit 14 sends a private message from the transmission unit 11 to the mobile phone 730 (third communication device) specified by the IPv6 address (second address + first address) of the mobile phone included in the response information (second information). Service request information (third information) is transmitted through the network 702 (first network) (third information transmission process / step S127).

  The transmitted service request information (third information) is received by the receiving unit 32 of the mobile phone 730 (FIG. 17C) and sent to the communication processing unit 34 (step S128). The communication processing unit 34 generates the response information and transmits it from the transmission unit 31 (step S129). This response information is received by the receiving unit 12 of the same PC 710 (FIG. 17A) as that in step S127 through the private network 702 (step S130).

<Features of this embodiment>
As described above, in this embodiment, the interface ID (first address) and account name (identification information) of the IPv6 address assigned to each mobile phone 730 (communication device) in the private network 702 (first network), Address association in which the prefix (second address) of the IPv6 address shared by the PC 710 and the cellular phone 730 (communication device) in the private network 702 (first network) is associated with each cellular phone 730 (communication device). The table 725a is stored in the storage unit 25 of the server device 720 (notification device) connected in the wide area network 703 (second network) outside the private network 702 (first network) (step S104), and the server device 720 is stored. (Notification device) search part 26, a source IPv6 address prefix (first information) of selection information (first information) transmitted from the PC 710 (first communication apparatus) in the private network 702 (first network) through the wide area network 703 (second network). 2 address) and the account name (identification information) included in the selection information (first information), the address association table 725a is searched, and the IPv6 address (second address) of the mobile phone 730 associated therewith + First address) is extracted (step S123), and the transmission unit 21 of the server device 720 (second communication device) in the wide area network 703 (second network) IPv6 of the mobile phone 730 extracted in step S123. Response information including address (second address + first address) (Second information), it was decided to transmit (step S124) via the wide area network 703 (second network). Thereby, the PC 710 can access the selected mobile phone 730 without knowing the IPv6 address of the mobile phone 730 in advance.

  Further, the registration processing (steps S101 to S107) of this embodiment is such that the mobile phone 730 (third communication device) itself sends the IPv6 address (second address + first address) via the router device 740 without the PC 710 intervening. It is transmitted to the server device 720. Therefore, the PC 710 can access the selected mobile phone 730 without being involved in the IPv6 address of the mobile phone 730 in advance.

<Modification of Third Embodiment>
Note that the present invention is not limited to the third embodiment.
For example, when the user inputs selection information of the mobile phone (account name) to the input unit 718 of the PC 710 in step S119, the server device 720 inputs a password or the like to the PC 710, and the user enters the mobile phone (account). It may be configured to authenticate whether there is an authority to select (name).
In the third embodiment, the server device 720 is configured to serve as both the second communication device and the notification device. However, the second communication device and the notification device may be configured separately. Moreover, the structure which a some 2nd communication apparatus shares a notification apparatus may be sufficient. This eliminates the need to create and manage duplicate address association tables, improving the efficiency of the entire system.

In the third embodiment, the PC 710 (first communication device) and the mobile phone 730 (third communication device) communicate with the wide area network 703 via the router device 740. However, the PC 710 (first communication device) The communication device may be configured to also serve as a router device.
Further, the PC (first communication device) may have the function of a router device, and the second communication device and the notification device may be separately configured to configure a communication system.

In the third embodiment, the account name is used as identification information of the mobile phone (third communication device). However, as identification information of the mobile phone (third communication device), a telephone number, an e-mail address, a MAC address, and other information are used. Information that uniquely identifies the mobile phone may be used. Moreover, in 3rd Embodiment, PC was used as a 1st communication apparatus and the example which uses a mobile telephone as a 3rd communication apparatus was shown. However, a mobile phone, a PDA, or the like may be used as the first communication device, and a PC, a PDA, or the like may be used as the third communication device.
Further, the wide area network 703 may be a private network.

[Other variations, etc.]
The various processes described above are not only executed in time series according to the description, but may also be executed in parallel or individually as required by the processing capability of the apparatus that executes the processes. Needless to say, other modifications are possible without departing from the spirit of the present invention.
Further, when the above-described configuration is realized by a computer, processing contents of functions that each device should have are described by a program. The processing functions are realized on the computer by executing the program on the computer.

  The program describing the processing contents can be recorded on a computer-readable recording medium. The computer-readable recording medium may be any medium such as a magnetic recording device, an optical disk, a magneto-optical recording medium, or a semiconductor memory. Specifically, for example, the magnetic recording device may be a hard disk device or a flexible Discs, magnetic tapes, etc. as optical discs, DVD (Digital Versatile Disc), DVD-RAM (Random Access Memory), CD-ROM (Compact Disc Read Only Memory), CD-R (Recordable) / RW (ReWritable), etc. As the magneto-optical recording medium, MO (Magneto-Optical disc) or the like can be used, and as the semiconductor memory, EEP-ROM (Electronically Erasable and Programmable-Read Only Memory) or the like can be used.

  The program is distributed by selling, transferring, or lending a portable recording medium such as a DVD or CD-ROM in which the program is recorded. Furthermore, the program may be distributed by storing the program in a storage device of the server computer and transferring the program from the server computer to another computer via a network.

  A computer that executes such a program first stores, for example, a program recorded on a portable recording medium or a program transferred from a server computer in its storage device. When executing the process, the computer reads a program stored in its own recording medium and executes a process according to the read program. As another execution form of the program, the computer may directly read the program from a portable recording medium and execute processing according to the program, and the program is transferred from the server computer to the computer. Each time, the processing according to the received program may be executed sequentially. Also, the program is not transferred from the server computer to the computer, and the above-described processing is executed by a so-called ASP (Application Service Provider) type service that realizes the processing function only by the execution instruction and result acquisition. It is good. Note that the program in this embodiment includes information that is used for processing by an electronic computer and that conforms to the program (data that is not a direct command to the computer but has a property that defines the processing of the computer).

  In this embodiment, the present apparatus is configured by executing a predetermined program on a computer. However, at least a part of these processing contents may be realized by hardware.

  As an industrial application field of the present invention, for example, an authentication system using a mobile phone (third communication device) in a private network (first network) as an authentication device can be exemplified. By applying the present invention, for example, a server device (also used as a notification device) in which a PC (first communication device) in a private network (first network) is a service providing device on a wide area network (second network). The server device (also used as a notification device) can execute processing for requesting user authentication by a mobile phone (third communication device) as an authentication device to the PC (first communication device).

FIG. 1 is a block diagram showing the overall configuration of the communication system of the first embodiment. 2A is a block diagram showing a functional configuration of the PC of FIG. 1, FIG. 2B is a diagram showing a functional configuration of the server apparatus of FIG. 1, and FIG. FIG. 2 is a diagram illustrating a functional configuration of the mobile phone in FIG. 1. FIG. 3 is a diagram showing a functional configuration of the NAPT device of FIG. FIG. 4A is a diagram illustrating a specific example of an address association table in which a global address (second address) of a transmission source is associated with a private address (first address) of a mobile phone. FIGS. 4B to 4E are diagrams illustrating a method of storing the private address (first address) of the mobile phone in the response information (second information). FIG. 5 is a sequence diagram for explaining the registration processing of the first embodiment. FIG. 6 is a sequence diagram for explaining service use processing according to the first embodiment. FIG. 7 is an illustration of a communication system in which two server devices that are second communication devices share one notification device. FIG. 8 is an example of a communication system when a PC (first communication device) also serves as a NAPT device. FIG. 9 is an example of a communication system in which a PC (first communication device) also serves as a NAPT device, and two server devices that are second communication devices share one notification device. FIG. 10 is a block diagram illustrating an overall configuration of a communication system according to the second embodiment. FIG. 11A is a block diagram showing the functional configuration of the PC of FIG. 10, FIG. 11B is a diagram showing the functional configuration of the server device of FIG. 10, and FIG. FIG. 11 is a diagram illustrating a functional configuration of the mobile phone in FIG. 10. FIG. 12A shows a specific example of an address association table in which a global address (second address) of a transmission source, a private address (first address) of a mobile phone, and an account name (identification information) are associated with each other. FIG. FIG. 12B is a diagram exemplifying the output mobile phone list information. FIG. 13 is a sequence diagram for explaining the registration processing of the second embodiment. FIG. 14 is a sequence diagram for explaining service use processing according to the second embodiment. FIG. 15 is a sequence diagram for explaining service use processing according to the second embodiment. FIG. 16 is a block diagram illustrating an overall configuration of a communication system according to the third embodiment. 17A is a block diagram showing the functional configuration of the PC of FIG. 16, FIG. 17B is a diagram showing the functional configuration of the server device of FIG. 16, and FIG. FIG. 17 is a diagram showing a functional configuration of the mobile phone in FIG. 16. FIG. 18 is a diagram illustrating a specific example of an address association table in which an IPv6 address (prefix (second address) + interface ID (first address)) is associated with an account name (identification information). FIG. 19 is a sequence diagram for explaining a registration process according to the second embodiment. FIG. 20 is a sequence diagram for explaining service use processing according to the second embodiment. FIG. 21 is a sequence diagram for explaining service use processing according to the second embodiment.

Explanation of symbols

1, 101, 201, 301, 401, 701 Communication system

Claims (10)

An inter-network communication method performed between a communication device in a first network and a communication device in a second network,
The first address assigned to each communication device in the first network is associated with the second address, which is address information in the second network shared by the communication devices in the first network, for each communication device. An address association table storage process for storing the address association table in a storage unit of a notification device connected in the second network outside the first network;
The search unit of the notification device receives the second address of the transmission source of the first information transmitted from the first communication device in the first network through the second network, and the search unit receives the input second address. A search process for searching the address association table using the above and extracting a first address associated with the second address;
A second information transmission process in which the transmission unit of the second communication device in the second network transmits the second information including the first address extracted in the search process through the second network;
A communication method between networks, comprising: The inter-network communication method according to claim 1,
A second information receiving process in which the receiving unit of the first communication device receives the second information;
A third information transmission process in which the transmission unit of the first communication device transmits the third information to the third communication device specified by the first address included in the second information through the first network; Have
The second information transmission process includes:
The transmission unit of the second communication device is a process of transmitting the second information to the first communication device as response information of the first information.
An inter-network communication method characterized by the above. The inter-network communication method according to claim 1 or 2,
The transmission unit of the connection device that connects the first network and the second network, the first address assigned to the third communication device transmitted from the third communication device in the first network, and the first network The registration request information having the second address which is the address information in the second network shared by the communication device is transmitted to the notification device, or the transmission unit of the third communication device in the first network Registration request information having a first address assigned to the third communication device and a second address that is address information in the second network shared by the communication devices in the first network, A registration request transmission process to be transmitted to the notification device;
The receiving unit of the notification device further includes a registration request receiving process of receiving the registration request information;
The address mapping table storage process is as follows:
A process of storing an address association table in which the first address and the second address of the registration request information received in the registration request reception process are associated with each other in the storage unit of the notification device;
An inter-network communication method characterized by the above. The inter-network communication method according to claim 1 or 2,
The address mapping table is
A table in which identification information for identifying a communication device in the first network is further associated with a first address and a second address corresponding to the communication device;
The above search process is
Furthermore, using the input identification information, it is a process of extracting the first address associated with the input second address and identification information,
An inter-network communication method characterized by the above. The inter-network communication method according to claim 4,
The transmission unit of the connection device that connects the first network and the second network includes a first address and identification information assigned to the third communication device transmitted from the third communication device in the first network, and the first Registration request information having a second address which is address information in a second network shared by communication devices in one network is transmitted to the notification device, or a third communication device in the first network Has a first address and identification information assigned to the third communication device, and a second address that is address information in the second network shared by the communication devices in the first network. A registration request transmission process for transmitting registration request information to the notification device;
The receiving unit of the notification device further includes a registration request receiving process of receiving the registration request information;
The address mapping table storage process is as follows:
Storing the address association table in which the first address, identification information, and second address of the registration request information received in the registration request reception process are associated with each other in the storage unit of the notification device;
An inter-network communication method characterized by the above. The inter-network communication method according to claim 3 or 5,
The registration request transmission process, the registration request reception process, and the address association table storage process are performed when the third communication device is connected to the first network for the first time, or when the third communication device is connected to the first network. A process that is executed each time a connection is made or a new first address is assigned to the third communication device.
An inter-network communication method characterized by the above. A notification device used for inter-network communication between a communication device in a first network and a communication device in a second network,
The first address assigned to each communication device in the first network is associated with the second address, which is address information in the second network shared by the communication devices in the first network, for each communication device. A storage unit for storing an address correspondence table;
The second address of the transmission source of the first information transmitted from the first communication device in the first network through the second network is input, and the search unit uses the input second address to input the address association table. And a search unit for extracting the first address associated with the second address,
Connected in a second network outside the first network,
The notification apparatus characterized by the above-mentioned. The notification device according to claim 7,
The address mapping table is
A table in which identification information for identifying a communication device in the first network is further associated with a first address and a second address corresponding to the communication device;
The search part above
Further, using the input identification information, a first address associated with the input second address and the identification information is extracted.
The notification apparatus characterized by the above-mentioned. The program for functioning a computer as a notification apparatus of Claim 7 or 8. A computer-readable recording medium storing the program according to claim 9.

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