JP2005268988A - Heterogeneous network gateway system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize a heterogeneous network gateway system that does not require a function for intercommunication at a client side, and can perform the interconnection by the protocol of the same network. <P>SOLUTION: The heterogeneous network gateway system comprises a first network; a second network differing from the first one; first equipment that can be connected to the first network and sets the virtual address of the first network as a destination address, when communicating with equipment connected to the second network; second equipment that can be connected to the second network and sets the virtual address of the second network as the destination address, when communicating with equipment connected to the first network; and an address conversion table that allows the virtual address of the first network to correspond to an address actually existing in the second network, and allows the virtual address of the second network to correspond to an address actually existing in the first network. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a heterogeneous network gateway system that interconnects different types of networks, and more particularly to a heterogeneous network gateway system that does not require a function for mutual communication on the client side and can be interconnected using the same network protocol.

  Prior art documents related to a heterogeneous network gateway system for interconnecting different types of conventional networks include the following.

Japanese Patent Laid-Open No. 06-216913 Japanese Patent Laid-Open No. 10-094038 JP 2002-175222 A JP 2003-087337 A

  FIG. 11 is a configuration block diagram showing an example of a conventional heterogeneous network gateway system. In FIG. 11, 1 is a computer that is a device connectable to an IP (Internet Protocol) network, 2 is a gateway that interconnects an IP network and a wireless network, and 3 is a PDA that is a device connectable to a wireless network that is a non-IP network. (Personal Digital Assistant) or a wireless terminal that is a device having functions such as a controller, an actuator, or a sensor and that can be connected to a wireless network, 100 is an IP network, and 200 is a wireless network.

  The computer 1 is connected to the IP network 100 and the wireless terminal 3 is connected to the wireless network 200. The gateway 2 is connected to the IP network 100 and the wireless network 200, respectively.

  FIGS. 12, 13, and 14 are block diagrams illustrating specific examples of the computer 1, the gateway 2, and the wireless terminal 3. In FIG. 12, reference numeral 4 denotes a communication unit that connects to the IP network 100 to perform communication. Reference numeral 5 denotes arithmetic control means such as an MPU (Micro Processing Unit) or CPU (Central Processing Unit), and reference numeral 6 denotes a storage means such as a hard disk in which application programs are stored or a RAM (Random Access Memory) used for temporary storage.

  The communication means 4 is mutually connected to the IP network 100, and the input / output of the communication means 4 is connected to the arithmetic control means 5. The input / output of the arithmetic control means 5 is connected to the storage means 6.

  The arithmetic control unit 5 reads and executes an application program for monitoring and controlling the network device via the communication unit 4 stored in the storage unit 6, thereby executing the network device connected to the IP network 100. Monitor and control.

  In FIG. 13, 7 is a communication means for communicating with the IP network 100, 8 is an arithmetic control means such as an MPU or CPU, 9 is a wireless communication means for communicating with the wireless network 200, and 10 is an application. Storage means such as a hard disk for storing programs and the like and RAM used for temporary storage.

  The communication means 7 is connected to the IP network 100 and the wireless communication means 9 is connected to the wireless network 200. The input / output of the communication means 7 and the wireless communication means 9 is connected to the calculation control means 8 respectively. The input / output of the arithmetic control means 8 is connected to the storage means 10.

  The arithmetic control means 8 reads and executes an application program for performing interconnection between the IP network 100 and the wireless network 200 using the communication means 7 and the wireless communication means 9 stored in the storage means 10. By connecting different networks seamlessly.

  Furthermore, in FIG. 14, 11 is a wireless communication means for communicating by connecting to the wireless network 200, 12 is an arithmetic control means such as an MPU or CPU, 13 is a hard disk in which application programs are stored, a RAM used for temporary storage, etc. Storage means.

  The wireless communication unit 11 is connected to the wireless network 200, and the input / output of the wireless communication unit 11 is connected to the calculation control unit 12. The input / output of the arithmetic control unit 12 is connected to the storage unit 13.

  The arithmetic control unit 12 reads out and executes an application program for outputting information to the outside via the wireless communication unit 11 stored in the storage unit 13, thereby transferring the stored information to the outside via the wireless network. Send to computer 1 etc.

  Here, the operation of the conventional example shown in FIG. 11 will be described with reference to FIGS. 15, 16, 17, 18, 19, 20, 21, and 22. FIG. FIG. 15 is a flowchart for explaining the operation of the computer 1, FIGS. 16 and 20 are diagrams for explaining protocol conversion and the like in the gateway, FIGS. 17 and 21 are diagrams for explaining the flow of information, and FIGS. FIG. 19 is a flowchart for explaining the operation of the gateway 2, and FIG. 19 is a flowchart for explaining the operation of the wireless terminal 3.

  Further, the IP address of the computer 1 is “IP # 1”, the IP address of the gateway 2 and the wireless network address (hereinafter simply referred to as WN (Wireless Network) address) are “IP # 0” and “WN # 0”, It is assumed that the WN address of the wireless terminal 3 is “WN # 1”.

  In “S001” in FIG. 15, the computer 1 (specifically, the arithmetic control means 5: hereinafter simply referred to as a computer) determines whether to transmit data or the like to the wireless terminal 3, and if so, the data or the like is transmitted. When it is determined that transmission is to be performed, the computer 1 sets the IP address of the gateway 2 as a transmission destination address in the IP header in “S002” in FIG.

  For example, “IP # 1” that is the IP address of the computer 1 is set as the source address of the IP header indicated by “IH01” in FIG. 16, and “IP # 0” that is the IP address of the gateway 2 as the destination address. "Is set.

  In “S003” in FIG. 15, the computer 1 sets the WN address of the wireless terminal 3 and data to be transmitted together in the payload, and transmits the IP packet generated in “S004” in FIG. 15 via the IP network 100.

  For example, the payload of the IP packet is composed of “WN # 1” which is the WN address of the wireless terminal 3 indicated by “WA01” in FIG. 16 and data to be transmitted indicated by “AD01” in FIG.

  For example, the computer 1 transmits the generated IP packet via the IP network 100 as indicated by “SI11” in FIG. In this case, since the transmission destination address set in the IP header is the IP address of the gateway 2, the transmitted IP packet reaches the gateway 2.

  On the other hand, in “S101” in FIG. 18, the gateway 2 (specifically, the arithmetic control means 8: hereinafter simply referred to as a gateway) determines whether or not an IP packet has been received via the IP network 100. If it is determined that the IP packet has been received, the gateway 2 extracts the WN address of the wireless terminal 3 from the IP packet in “S102” in FIG.

  Then, in “S103” in FIG. 18, the gateway 2 converts the IP packet into a WN packet based on a WN (Wireless Network: simply referred to as WN) protocol and extracts the WN address of the wireless terminal 3 extracted in the WN header. Set.

  For example, “WN # 0” that is the WN address of the gateway 2 is set in the transmission source address of the WN header indicated by “WH01” in FIG. 16, and “WN #” that is the WN address of the wireless terminal 3 is set as the transmission destination address. 1 "is set.

  Finally, in “S104” in FIG. 18, the gateway 2 transmits the converted WN packet via the wireless network 200.

  For example, as indicated by “SW01” in FIG. 17, the gateway 2 transmits the converted WN packet via the wireless network 200. In this case, since the transmission destination address set in the WN header is the WN address of the wireless terminal 3, the transmitted WN packet reaches the wireless terminal 3.

  Further, in “S201” in FIG. 19, the wireless terminal 3 (specifically, the calculation control means 12: hereinafter simply referred to as a wireless terminal) determines whether or not to transmit data or the like to the computer 1, and if so, If it is determined that data or the like is to be transmitted, the wireless terminal 3 sets the WN address of the gateway 2 as a transmission destination address in the WN header in “S202” in FIG.

  For example, “WN # 1” that is the WN address of the wireless terminal 3 is set in the source address of the WN header shown in “WH21” in FIG. 20, and “WN #” that is the WN address of the gateway 2 in the destination address 0 "is set.

  In “S203” in FIG. 19, the wireless terminal 3 sets the IP address of the computer 1 and data to be transmitted together in the payload, and transmits the WN packet generated in “S204” in FIG.

  For example, the payload of the WN packet is composed of “IP # 1”, which is the IP address of the computer 1 indicated by “IA21” in FIG. 20, and data to be transmitted indicated by “AD21” in FIG.

  Further, for example, as indicated by “SW 31” in FIG. 21, the wireless terminal 3 transmits the generated WN packet via the wireless network 200. In this case, since the transmission destination address set in the WN header is the WN address of the gateway 2, the transmitted WN packet reaches the gateway 2.

  On the other hand, in “S301” in FIG. 22, the gateway 2 determines whether or not the WN packet is received via the wireless network 200. If it is determined that the WN packet is received, “S302” in FIG. The gateway 2 extracts the IP address of the computer 1 from the WN packet.

  Then, in “S303” in FIG. 22, the gateway 2 converts the WN packet into an IP packet based on the IP protocol and sets the extracted IP address of the computer 1 in the IP header.

  For example, “IP # 0” that is the IP address of the gateway 2 is set in the source address of the IP header indicated by “IH21” in FIG. 20, and “IP # 1” that is the IP address of the computer 1 is set as the destination address. "Is set.

  Finally, in “S304” in FIG. 22, the gateway 2 transmits the converted IP packet via the IP network 100.

  For example, the gateway 2 transmits the converted IP packet via the IP network 100 as indicated by “SI31” in FIG. In this case, since the transmission destination address set in the IP header is the IP address of the computer 1, the transmitted IP packet reaches the computer 1.

  As a result, the source device generates a packet in which an address corresponding to the protocol of the network to which the destination device is connected is attached to the payload, and the gateway 2 extracts the attached address from the payload of the received packet. By setting the extracted address as the transmission destination address of the header of the converted packet, it becomes possible to interconnect different types of networks.

  However, in the conventional example shown in FIG. 11, devices (clients) such as the computer 1 and the wireless terminal 3 attach an address corresponding to the protocol of the network to which the destination device is connected to the payload in order to enable mutual communication. There was a problem that there was a need to install a separate function to generate packets.

  In the conventional example shown in FIG. 11, it is necessary for a device (client) such as the computer 1 or the wireless terminal 3 to specify an address corresponding to the protocol of the network to which the transmission destination device is connected. There is a problem that (address) must be managed in a device (client) such as the computer 1 or the wireless terminal 3.

In other words, the development of application programs for devices (clients) such as the computer 1 and the wireless terminal 3 becomes complicated, and the versatility is lowered. Also, it is difficult to cope with the addition of a gateway or an address change, so the expandability of the system is also lowered. End up.
Therefore, the problem to be solved by the present invention is to realize a heterogeneous network gateway system that does not require a function for mutual communication on the client side and can be interconnected by the same network protocol.

In order to achieve such a problem, the invention according to claim 1 of the present invention is:
In heterogeneous network gateway systems that interconnect different types of networks,
When communicating with a first network, a second network that is different from the first network, and a device that is connectable to the first network and connected to the second network, When the first device that sets the virtual address of the first network communicates with the device that is connectable to the second network and is connected to the first network, the second network is used as a destination address. A second device that sets a virtual address of the first network, a virtual address of the first network, and an address existing in the second network, and a virtual address of the second network and the first network An address conversion table for associating addresses existing in the network, and the first address as the destination address Or a gateway that receives a packet in which the virtual address of the second network is set, converts the address based on the address conversion table, and converts the protocol, so that the client side can communicate with each other. No function is required and interconnection is possible using the same network protocol. Further, by extending the address conversion table, it is possible to connect various types of networks, and by changing the address conversion table, it is possible to easily cope with address changes.

The invention according to claim 2
In the heterogeneous network gateway system according to claim 1,
The first device is
Communication means for communicating by connecting to the first network, storage means for storing an application program, and reading and executing the application program from the storage means, and the second device via the communication means Since the communication control unit is configured to communicate with each other, a function for mutual communication is unnecessary on the client side, and mutual connection is possible using the same network protocol. Further, by extending the address conversion table, it is possible to connect various types of networks, and by changing the address conversion table, it is possible to easily cope with address changes.

The invention described in claim 3
In the heterogeneous network gateway system according to claim 1,
The second device is
A communication unit that communicates by connecting to the second network; a storage unit that stores an application program; and the application program is read from the storage unit, executed, and the first device via the communication unit. Since the communication control unit is configured to communicate with each other, a function for mutual communication is unnecessary on the client side, and mutual connection is possible using the same network protocol. Further, by extending the address conversion table, it is possible to connect various types of networks, and by changing the address conversion table, it is possible to easily cope with address changes.

The invention according to claim 4
In the heterogeneous network gateway system according to claim 1,
The gateway is
A first communication unit that communicates by connecting to the first network; a second communication unit that communicates by connecting to the second network; a storage unit that stores an application program; By comprising the arithmetic control means for reading out and executing the application program from the means and connecting the heterogeneous networks, the client side does not need a function for mutual communication and can be interconnected using the same network protocol. Further, by extending the address conversion table, it is possible to connect various types of networks, and by changing the address conversion table, it is possible to easily cope with address changes.

The invention according to claim 5
In the heterogeneous network gateway system according to claim 1,
Since the first network is an IP network and the second network is a wireless network, the client side does not need a function for mutual communication and can be interconnected using the same network protocol. Further, by extending the address conversion table, it is possible to connect various types of networks, and by changing the address conversion table, it is possible to easily cope with address changes.

The invention described in claim 6
In the heterogeneous network gateway system according to claim 1,
Since the first network is an IPv4 network and the second network is an IPv6 network, a function for mutual communication is unnecessary on the client side, and interconnection is possible using the same network protocol. Further, by extending the address conversion table, it is possible to connect various types of networks, and by changing the address conversion table, it is possible to easily cope with address changes.

The invention described in claim 7
In the heterogeneous network gateway system according to any one of claims 1 to 6,
By applying to the plant control system, the client side does not need a function for mutual communication and can be interconnected using the same network protocol. Further, by extending the address conversion table, it is possible to connect various types of networks, and by changing the address conversion table, it is possible to easily cope with address changes.

The invention described in claim 8
In the heterogeneous network gateway system according to any one of claims 1 to 6,
Application to the wide-area field monitoring system eliminates the need for a function for mutual communication on the client side and enables mutual connection using the same network protocol. Further, by extending the address conversion table, it is possible to connect various types of networks, and by changing the address conversion table, it is possible to easily cope with address changes.

The invention according to claim 9
In the heterogeneous network gateway system according to any one of claims 1 to 6,
Application to the home automation system eliminates the need for mutual communication functions on the client side, and enables mutual connection using the same network protocol. Further, by extending the address conversion table, it is possible to connect various types of networks, and by changing the address conversion table, it is possible to easily cope with address changes.

The invention according to claim 10 is:
In the heterogeneous network gateway system according to any one of claims 1 to 6,
By applying it to a building automation system, the client side does not need a function for mutual communication and can be interconnected using the same network protocol. Further, by extending the address conversion table, it is possible to connect various types of networks, and by changing the address conversion table, it is possible to easily cope with address changes.

The present invention has the following effects.
According to the first, second, third, fourth, fifth, sixth, seventh, eighth, and ninth aspects of the invention, the gateway associates the virtual IP address with the existing WN address, and the virtual WN address. A packet having a virtual IP address and a virtual WN address set as a destination address, and converting the address and converting the protocol based on the address conversion table As a result, the client side does not need a function for mutual communication and can be interconnected using the same network protocol.

  Further, by extending the address conversion table, it is possible to connect various types of networks, and by changing the address conversion table, it is possible to easily cope with address changes.

  Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an embodiment of a heterogeneous network gateway system according to the present invention. In FIG. 1, 14 is a computer that is a device connectable to an IP network, 15 is a gateway that interconnects the IP network and the wireless network, 16 is a PDA that is connectable to a wireless network that is a non-IP network, or a controller , A wireless terminal which is a device having a function such as an actuator or a sensor and connectable to a wireless network, 101 is an IP network, and 201 is a wireless network.

  The computer 14 is connected to the IP network 101, and the wireless terminal 16 is connected to the wireless network 201. The gateway 15 is connected to the IP network 101 and the wireless network 201, respectively.

  2, 3, and 4 are configuration block diagrams illustrating specific examples of the computer 14, the gateway 15, and the wireless terminal 16. In FIG. 2, reference numeral 17 denotes a communication unit that communicates by connecting to the IP network 101. Reference numeral 18 denotes arithmetic control means such as an MPU or CPU, and 19 denotes a storage means such as a hard disk for storing application programs or the like, or a RAM used for temporary storage.

  The communication means 17 is mutually connected to the IP network 101, and the input / output of the communication means 17 is connected to the calculation control means 18. The input / output of the arithmetic control means 18 is connected to the storage means 19.

  The arithmetic control unit 18 reads and executes an application program or the like for monitoring and controlling the network device via the communication unit 17 stored in the storage unit 19, thereby executing a network connected to the IP network 101. Monitor and control equipment.

  Also, in FIG. 3, 20 is a communication means for communicating with the IP network 101, 21 is an arithmetic control means such as an MPU or CPU, 22 is a wireless communication means for communicating with the wireless network 201, and 23 is an application. Storage means such as a hard disk for storing programs and the like and RAM used for temporary storage.

  The communication means 20 is connected to the IP network 101 and the wireless communication means 22 is connected to the wireless network 201. The input / output of the communication unit 20 and the wireless communication unit 22 is connected to the calculation control unit 21. The input / output of the arithmetic control means 21 is connected to the storage means 23.

  The arithmetic and control unit 21 reads and executes an application program or the like for performing interconnection between the IP network 101 and the wireless network 201 using the communication unit 20 and the wireless communication unit 22 stored in the storage unit 23. Thus, different networks can be seamlessly connected.

  Further, in FIG. 4, 24 is a wireless communication means for communicating by connecting to the wireless network 201, 25 is an arithmetic control means such as an MPU or CPU, 26 is a hard disk for storing application programs or the like, a RAM for temporary storage, etc. Storage means.

  The wireless communication unit 24 is connected to the wireless network 201, and the input / output of the wireless communication unit 24 is connected to the calculation control unit 25. The input / output of the arithmetic control means 25 is connected to the storage means 26.

  The arithmetic control unit 25 reads out and executes an application program or the like for outputting information to the outside via the wireless communication unit 24 stored in the storage unit 26, and thereby stores the information to be held via the wireless network 201. Transmit to an external computer 14 or the like.

  Here, the operation of the embodiment shown in FIG. 1 will be described with reference to FIGS. 5, 6, 7, 8, 9 and 10. FIG. 5 is a flowchart illustrating the operation of the computer 14, FIGS. 6 and 9 are explanatory diagrams illustrating protocol conversion in the gateway, FIGS. 7 and 10 are flowcharts illustrating the operation of the gateway 15, and FIG. FIG. 6 is a flowchart for explaining the operation of the terminal 16.

  Further, the IP address of the computer 14 is “IP # 1”, the IP address and WN address of the gateway 15 are “IP # 0” and “WN # 0”, and the WN address of the wireless terminal 16 is “WN # 1”. Assume that

  Further, the gateway 15 associates the virtual IP address “IP # 2” with the WN address “WN # 1” of the wireless terminal 16, and the virtual WN address “WN # 2” and the IP address “IP #” of the computer 14. Assume that a packet having an address conversion table that associates 1 ”with a virtual IP address“ IP # 2 ”and a virtual WN address“ WN # 2 ”as a destination address is received.

  In “S401” in FIG. 5, the computer 14 (specifically, the arithmetic control means 18: hereinafter simply referred to as a computer) determines whether or not to transmit data or the like to the wireless terminal 16, and if so, the data or the like is transmitted. If it is determined to transmit, the computer 14 sets a virtual IP address associated with the wireless terminal 16 as a destination address in the IP header in “S402” in FIG. 5 and generates it in “S403” in FIG. The transmitted IP packet is transmitted via the IP network 101.

  For example, “IP # 1” that is the IP address of the computer 14 is set in the source address of the IP header indicated by “IH41” in FIG. 6, and the virtual IP associated with the wireless terminal 16 is set in the destination address. The address “IP # 2” is set.

  For example, the computer 14 transmits the generated IP packet via the IP network 101. In this case, since the virtual IP address “IP # 2” is set as the transmission destination address set in the IP header, the gateway 15 receives the IP packet.

  On the other hand, in “S501” in FIG. 7, the gateway 15 (specifically, the calculation control means 21: hereinafter simply referred to as a gateway) determines whether or not an IP packet is received via the IP network 101, and If it is determined that the IP packet has been received, the gateway 15 converts the IP address and virtual IP address set in the IP header into a WN address based on the address conversion table in “S502” in FIG.

  For example, the IP address “IP # 1” set in the IP header indicated by “IH41” in FIG. 6 is converted into a virtual WN address “WN # 2” based on the address conversion table. Similarly, “IH41” in FIG. The virtual IP address “IP # 2” set in the IP header indicated by “” is converted to the WN address “WN # 1” based on the address conversion table.

  Then, in “S503” in FIG. 7, the gateway 15 converts the IP packet into a WN packet based on the WN protocol, and in “S504” in FIG. 7, the gateway 15 transmits the converted WN packet via the wireless network 201. .

  For example, among the WN packets generated in this way, “WN # 2” which is a virtual WN address corresponding to the IP address of the computer 1 is set in the source address of the WN header indicated by “WH41” in FIG. In the transmission destination address, “WN # 1”, which is the WN address of the wireless terminal 16, is set.

  For example, the gateway 15 transmits the converted WN packet via the wireless network 201. In this case, since the transmission destination address set in the WN header is the WN address of the wireless terminal 16, the transmitted WN packet reaches the wireless terminal 16.

  Further, in “S601” in FIG. 8, the wireless terminal 16 (specifically, the arithmetic control means 25: hereinafter simply referred to as a computer) determines whether or not to transmit data or the like to the computer 14, and When “S602” in FIG. 8 is determined, the wireless terminal 16 sets a virtual WN address associated with the computer 14 as a transmission destination address in the WN header and “S603” in FIG. The WN packet generated in step 1 is transmitted via the wireless network 201.

  For example, “WN # 1” that is the WN address of the wireless terminal 16 is set as the source address of the WN header shown as “WH51” in FIG. 9, and the virtual address associated with the computer 14 is set as the destination address. The WN address “WN # 2” is set.

  For example, the wireless terminal 16 transmits the generated WN packet via the wireless network 201. In this case, since the virtual WN address “WN # 2” is set as the transmission destination address set in the WN header, the gateway 15 receives the WN packet.

  On the other hand, in “S701” in FIG. 10, the gateway 15 determines whether or not the WN packet has been received via the wireless network 201. If it is determined that the WN packet has been received, “S702” in FIG. The gateway 15 converts the WN address and virtual WN address set in the WN header into an IP address based on the address conversion table.

  For example, the WN address “WN # 1” set in the WN header indicated by “WH51” in FIG. 9 is converted to the virtual IP address “IP # 2” based on the address conversion table. Similarly, “WH51” in FIG. The virtual WN address “WN # 2” set in the WN header indicated by “” is converted into the IP address “IP # 1” based on the address conversion table.

  Then, in “S703” in FIG. 10, the gateway 15 converts the WN packet into an IP packet based on the IP protocol, and in “S704” in FIG. 10, the gateway 15 transmits the converted IP packet via the IP network 101. .

  For example, among the IP packets generated in this way, “IP # 2” which is a virtual IP address corresponding to the WN address of the wireless terminal 16 is set in the source address of the IP header indicated by “IH51” in FIG. Then, “IP # 1” which is the IP address of the computer 14 is set as the transmission destination address.

  For example, the gateway 15 transmits the converted IP packet via the IP network 101. In this case, since the transmission destination address set in the IP header is the IP address of the computer 14, the transmitted IP packet reaches the computer 14.

  As a result, the gateway 15 has an address conversion table for associating the virtual IP address with the actual WN address, and associating the virtual WN address with the existing IP address, and the virtual IP address and the virtual WN are used as transmission destination addresses. By receiving a packet in which an address is set, converting the address based on the address conversion table, and converting the protocol, the client side does not need a function for mutual communication and can be interconnected using the same network protocol. .

  Further, by extending the address conversion table, it is possible to connect various types of networks, and by changing the address conversion table, it is possible to easily cope with address changes.

  In the embodiment shown in FIG. 1, the interconnection between the IP network and the wireless network is illustrated, but it is needless to say that the present invention is not limited to this combination, and IEEE 1394, Bluetooth (registered trademark), ZigBee (registered trademark). Any combination of various communication methods may be used. Further, even an IP network may be an interconnection between “IPv4 (Internet Protocol version 4)” and “IPv6 (Internet Protocol version 6)”.

Further, it is effective to apply the embodiment shown in FIG. 1 to a system as shown below.
(1) Plant control system (2) Wide-area field monitoring system (3) Home network system (4) Building automation system

  (1) In a plant control system, operation costs and installation costs can be reduced by using a wireless network for plant control. In addition, when an existing monitoring system is constructed with an IP network, a wireless network can be easily constructed by using the gateway according to the present invention.

  (2) In a wide-area field monitoring system, in a configuration in which a device that collects information such as measurement values, images, and sounds is arranged in a monitoring target field, a wireless LAN, wireless 1394, or the like is used in an image collection terminal that requires large-capacity communication. However, the communication network such as Bluetooth (registered trademark) is suitable for the voice collection node that handles the voice data. However, by using the gateway according to the present invention, the network of the different communication system can be easily changed. It becomes possible to interconnect.

  (3) In the home network system, even in the case where “IPv4” and “IPv6” coexist or coexist with other home networks, the network of the different communication system can be easily used by using the gateway according to the present invention. Can be interconnected.

  (4) In a building automation system, even in an environment where “IPv4”, “IPv6”, “BACnet (registered trademark)” and wireless communication are mixed, it is easily different by using the gateway according to the present invention. Communication networks can be interconnected.

1 is a configuration block diagram showing an embodiment of a heterogeneous network gateway system according to the present invention. And FIG. 18 is a block diagram illustrating a specific example of a computer. It is a block diagram explaining a specific example of a gateway. It is a block diagram illustrating a specific example of a wireless terminal. It is a flowchart explaining operation | movement of a computer. It is explanatory drawing explaining the protocol conversion etc. in a gateway. It is a flowchart explaining operation | movement of a gateway. It is a flowchart explaining operation | movement of a radio | wireless terminal. It is explanatory drawing explaining the protocol conversion etc. in a gateway. It is a flowchart explaining operation | movement of a gateway. It is a configuration block diagram showing an example of a conventional heterogeneous network gateway system. And FIG. 18 is a block diagram illustrating a specific example of a computer. It is a block diagram explaining a specific example of a gateway. It is a block diagram illustrating a specific example of a wireless terminal. It is a flowchart explaining operation | movement of a computer. It is explanatory drawing explaining the protocol conversion etc. in a gateway. It is explanatory drawing explaining the flow of information. It is a flowchart explaining operation | movement of a gateway. It is a flowchart explaining operation | movement of a radio | wireless terminal. It is explanatory drawing explaining the protocol conversion etc. in a gateway. It is explanatory drawing explaining the flow of information. It is a flowchart explaining operation | movement of a gateway.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,14 Computer 2,15 Gateway 3,16 Wireless terminal 4,7,17,20 Communication means 5,8,12,18,21,25 Operation control means 6,10,13,19,23,26 Storage means 9 , 11, 22, 24 Wireless communication means 100, 101 IP network 200, 201 Wireless network

Claims (10)

In heterogeneous network gateway systems that interconnect different types of networks,
A first network;
A second network of a different type from the first network;
A first device that sets a virtual address of the first network as a destination address when communicating with a device that is connectable to the first network and connected to the second network;
A second device that sets a virtual address of the second network as a destination address when communicating with a device that is connectable to the second network and connected to the first network;
An address conversion table for associating a virtual address of the first network with an address existing in the second network, and associating a virtual address of the second network with an address existing in the first network; And a gateway that receives a packet in which the virtual address of the first or second network is set as a destination address, converts the address based on the address conversion table, and converts the protocol. Characteristic heterogeneous network gateway system. The first device is
Communication means for communicating by connecting to the first network;
Storage means for storing application programs;
2. The heterogeneous network gateway according to claim 1, further comprising: an arithmetic control unit that reads and executes the application program from the storage unit and performs communication with the second device via the communication unit. system. The second device is
Communication means for communicating by connecting to the second network;
Storage means for storing application programs;
2. The heterogeneous network gateway according to claim 1, further comprising: an arithmetic control unit that reads and executes the application program from the storage unit and communicates with the first device via the communication unit. system. The gateway is
First communication means for communicating by connecting to the first network;
Second communication means for communicating by connecting to the second network;
Storage means for storing application programs;
2. The heterogeneous network gateway system according to claim 1, wherein the heterogeneous network gateway system comprises an arithmetic control unit that reads and executes the application program from the storage unit and connects the heterogeneous network. 2. The heterogeneous network gateway system according to claim 1, wherein the first network is an IP network, and the second network is a wireless network. 2. The heterogeneous network gateway system according to claim 1, wherein the first network is an IPv4 network and the second network is an IPv6 network. The heterogeneous network gateway system according to claim 1, wherein the heterogeneous network gateway system is applied to a plant control system. The heterogeneous network gateway system according to any one of claims 1 to 6, wherein the heterogeneous network gateway system is applied to a wide area field monitoring system. The heterogeneous network gateway system according to any one of claims 1 to 6, wherein the heterogeneous network gateway system is applied to a home automation system. The heterogeneous network gateway system according to claim 1, wherein the heterogeneous network gateway system is applied to a building automation system.

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