JP2006141051A - Integrated ip transfer network - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a communication method of an integrated IP transfer network, including in the inside a plurality of separated IP transfer networks having various characteristics, such as IP telephone networks, IP image networks, IP electronic text networks, and IP base TV broadcasting networks. <P>SOLUTION: The integrated IP transfer network includes a plurality of network node devices and a plurality of IP transfer networks, and the network node devices are respectively connected to a plurality of terminals installed at the outside of the integrated IP transfer network and respectively connected at least to one or more IP transfer networks. In the method for communication between a transmission-side terminal 1 and a destination terminal 2 via the integrated IP network, by transmitting an IP packet transmitted from the transmission side terminal 1 to the destination terminal 2 via any one of the IP transfer networks connected to the network node devices 1 via the destination-side network node device 2, the network node device 1 determines the IP transfer network via which the IP packet is transmitted, on the basis of a port number included in the IP packet. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an integrated IP transfer network of an IP (Internet Protocol) transfer network for performing computer communication based on TCP / IP (Transmission Control Protocol / Internet Protocol) technology.

  An IP transfer network (hereinafter referred to as an IP telephone network) that transmits and receives digitized voice data based on the TCP / IP technology has a communication line speed of about 64 Kbps, The arrival time is suppressed to 0.1 seconds or less, for example. An IP transfer network (hereinafter referred to as an IP image network) for compressing and transmitting TV moving images based on TCP / IP technology has a communication line speed of, for example, 1.5 Mbps, and the arrival time of image data is several minutes. The IP transfer network is allowed to some extent.

  In addition, an IP transfer network (hereinafter referred to as an IP electronic text network) that transfers text for electronic slips based on TCP / IP technology has a communication line speed of, for example, about 128 Kbps and a data arrival time of less than 1 second. ing. In this case, since reliability is more important than voice transmission and TV image transmission, the IP transfer network has a communication error occurrence rate of, for example, 1/100 or less of the IP telephone network or IP image network.

  As another IP transfer network, an “IP data multicast network” for transferring IP data such as an electronic book or an electronic newspaper from one delivery source to a plurality of destinations using a multicast technology which is one of IP technologies. There is an “IP-based TV broadcast network” that is an IP audio image network that transfers (broadcasts) both TV audio data and image data to a plurality of destinations. These multicast networks differ from the above-described IP transport network in that they are not 1: 1 communication.

  As shown in FIG. 29, in a conventional IP transfer network 20 typified by the Internet, an IP packet 26-1 including IP telephone data, IP image data, IP electronic slip text data, etc. 1 to the terminal 23-2 in the LAN 22 via the router 24-1 in the LAN 21 and further through the routers 22-1 to 22-4 in the IP transfer network 20 and the router 24-2 in the LAN 22. To reach. The Internet cannot guarantee the communication speed or the like in IP transfer, but is generally called “best effort network” in the sense of making the utmost effort. As in this example, IP telephone data, IP image data, IP electronic slip text data, and the like flow through a mixture of communication lines in the IP transfer network 20. In other words, in the conventional IP transfer network, an IP transfer network having various characteristics such as an IP telephone network, an IP image network, an IP electronic text network, a best effort network, an IP data multicast network, and an IP-based TV broadcast network, Is not included separately. For these reasons, the IP telephone network, the IP image network, the IP electronic text network, the best effort network, the IP data multicast network, and the IP-based TV broadcasting network have been created independently. There is a problem of increasing the total cost.

  Here, with reference to FIG. 30, a multicast type IP transfer network 27-1 for transferring from one delivery source to a plurality of destinations will be described. 27-2 to 27-9 are routers. In particular, the routers 27-2, 27-6, 27-7, 27-8, and 27-9 are connected to the user IP terminals 28-1 to 28-9 via communication lines. It is also called a network node. Routers 27-3, 27-4, 27-6, 27-7, and 27-8 indicate that the IP packet should be transferred to a plurality of communication lines for each multicast address included in the received IP packet. Another multicast table is maintained. In this embodiment, the multicast address designates “MA1”. When IP packet 29-1 having multicast address “MA1” is transmitted from IP terminal 28-1 and reaches router 27-3 via router 27-2, router 27-3 copies IP packet 29-2. Then, the IP packet 29-3 and the IP packet 29-4 are transferred to the communication line with reference to the router-specific multicast table held by the router 27-3. The router 27-4 copies the received IP packet 29-3 and transfers the IP packet 29-5 and the IP packet 29-6 to the communication line with reference to the multicast table for each router. Since the router 27-5 does not have a router-specific multicast table, the IP packet 29-4 passes through the router 27-5 as it is and is transferred to the router 27-8 as an IP packet 29-7. The router 27-6 copies the received IP packet 29-5, refers to the multicast table for each router, and sends the IP packet 29-8 to the IP terminal 28-2 and the IP packet 29-9 to the IP terminal 28-3. Transfer each one. The router 27-7 copies the received IP packet 29-6, refers to the multicast table for each router, and sends the IP packet 29-10 to the IP terminal 28-4 and the IP packet 29-11 to the IP terminal 28-5. Transfer each one. The router 27-8 copies the received IP packet 29-7, refers to the multicast table for each router, and sends the IP packet 29-12 to the IP terminal 28-6 and the IP packet 29-13 to the IP terminal 28-7. The IP packet 29-14 is transferred to the IP terminal 28-8. When the transmission source IP terminal 28-1 transfers an electronic book or electronic newspaper in a digital data format to the IP transfer network 27-1, the IP transfer network 27-1 uses an IP for delivering the electronic book or electronic newspaper. It is a data multicast network, and the IP terminals 28-2 to 28-8 are IP terminals of users who subscribe to electronic books and electronic newspapers. When the transmission source IP terminal 28-1 is replaced with an audio image transmission device for TV broadcasting and a TV program (that is, sound and image) is broadcast, the IP transfer network becomes an IP-based TV broadcasting network, and the IP terminal 28- 2 to 28-8 are IP terminals with a TV receiving function for TV viewers.

  The present invention has been made under the circumstances as described above. The object of the present invention is to provide an IP telephone network, an IP image network, an IP electronic text network, a best effort network, an IP data multicast network, an IP-based TV broadcasting network, and the like. It is an object of the present invention to provide a communication method for an integrated IP transfer network that includes a plurality of IP transfer networks having various characteristics.

The present invention relates to a communication method for an integrated IP transfer network, and the object of the present invention is to provide an integrated IP transfer network including a plurality of network node devices and a plurality of IP transfer networks, and each of the network node devices is the integrated IP transfer network. Are connected to at least one or more of the IP transfer networks, and IP packets transmitted from the originating terminal 1 are connected to the originating network node device 1 and the network node device 1. By being transmitted to the destination terminal 2 via the destination side network node device 2 via any one of the IP transfer networks, the terminal 1 and the terminal 2 pass through the integrated IP network. In the method of performing communication, the network node device 1 determines the IP transfer network through which the IP packet passes based on the port number in the IP packet, or the integrated IP transfer network includes a plurality of A node device and a plurality of IP transfer networks, wherein the network node device includes two or more network node terminals, and each of the network node devices is connected to a plurality of terminals outside the integrated IP transfer network, and each of the IP transfer An IP packet connected to at least one of the networks and transmitted from the originating side terminal 1 passes through either the originating side network node device 1 or the IP forwarding network connected to the network no IP device 1. In the method of communicating between the terminal 1 and the terminal 2 via the integrated IP network by being transmitted to the destination terminal 2 via the destination-side network node apparatus 2, the network node apparatus 1 Determines the IP forwarding network through which the IP packet passes based on the port number of the IP packet, and the IP address in the IP packet and the network node to which the IP packet is input. Based on the network node apparatus 1, it is accomplished by determining the network node of the network node apparatus 2.
Further, the above object of the present invention is to determine an IP forwarding network through which the IP packet passes based on an IP address instead of a port number, or at least one of the IP forwarding networks is an IP telephone network. Or at least one of the IP transport networks is an IP data network, or at least one of the IP transport networks is an IP-based TV broadcast network. The

  As described above, according to the present invention, it is not necessary to use a high-priced dedicated line, a high-speed communication line used for moving picture communication such as a TV is not provided, or a person in charge of a facility expansion plan for a communication line. A relatively inexpensive large-scale communication system can be constructed without using the Internet. Integrated IP including a plurality of IP transfer networks having various characteristics such as an IP telephone network, an IP image network, an IP electronic text network, a best effort network, an IP data multicast network, and an IP-based TV broadcasting network. Since the transfer network is used, the overall cost can be reduced.

  In the present invention, a plurality of IP transfer networks having different characteristics such as an IP telephone network, an IP image network, an IP electronic text network, a best effort network, an IP data multicast network, and an IP-based TV broadcast network are virtually installed and integrated. An address management table is set in the network node device installed at the input point to the integrated IP transfer network from the outside of the IP transfer network, and the terminal address and the application program (AP) in the terminal are distinguished in this address management table. The port number to be registered is registered in advance, and the address and port number written in the IP packet input to the integrated IP transfer network are compared with the address and port number registered in the address management table, thereby integrating Within the IP transfer network, the data is divided and transmitted to the IP transfer network. It is also possible to compare only addresses without using port numbers.

Embodiments of the present invention will be described below with reference to the drawings.

1. First embodiment for selecting an IP network by IP address and port number:
In FIG. 1, for example, a transmission source terminal 8-1 inside the LAN 1 transmits an IP packet PK01 to a destination terminal 8-2 inside the LAN 2 via the integrated IP transfer network 1. A junction point where the communication lines 6-X1 and 6-X2 input to the network node device 5-X is referred to as a “network node terminal”. The network node terminal (5-X) of the communication line 6-X1 is given a network node terminal address “G100” used inside the integrated IP transfer network 1, and the network node terminal (5 of the communication line 6-X2). -X) is assigned the network node terminal address "G110", and the network node terminal (5-Y) of the communication line 6-Y is assigned the network node terminal address "G200". The IP packet PK01 is a source for identifying the address “A100” of the source terminal 8-1, the address “A200” of the destination terminal 8-2, and the application program (AP) inside the source terminal 8-1. It includes a port number “4300” (SP), a destination port number “300” (DP) for identifying an application program in the destination terminal 8-2, and data used in the application program.

  Here, the application program is a voice telephone transmission / reception program, an image transmission / reception program, an electronic slip transmission / reception program, a WWW (World Wide Web) data transmission / reception program that operates by HTTP (Hyper Text Transfer Protocol), and the like. The voice telephone transmission / reception program refers to a telephone transmission / reception program for an IP telephone using digital technology. In this embodiment, the terminal address indicates an IP address, and the port number indicates a port number set in a TCP (Transmission Control Protocol) format data block or a UDP (User Datagram Protocol) format data block. In the present invention, the record of the address management table refers to a row of the table, and the record includes a plurality of data items.

  In FIG. 1, reference numeral 2 denotes an IP image network, in which an IP image network 2-X of a communication company X and an IP image network 2-Y of a communication company Y are connected by an IP packet switching point 2-1. Reference numeral 3 denotes an IP multipurpose network, in which the IP multipurpose network 3-X of the communication company X and the IP multipurpose network 3-Y of the communication company Y are connected by an IP packet switching point 3-1. Reference numeral 4 denotes an IP telephone network, in which an IP telephone network 4-X of a communication company X and an IP telephone network 4-Y of a communication company Y are connected by an IP packet switching point 4-1. As described above, the integrated IP transfer network 1 includes the IP image network 2, the IP versatile network 3, and the IP telephone network 4. Further, an address management table rewriting device 11-1 is connected to the network node device 5-X, and an address management table rewriting device 11-2 is connected to the network node device 5-Y. The address management table rewriting devices 11-1 and 11-2 can write addresses, port numbers, etc. in the address management table in the network node device 5-X or 5-Y, respectively.

  In such a configuration, the operation will be described with reference to the flowchart of FIG. FIG. 2 is a flowchart showing an operation example of the network node device 5-X. First, an IP packet PK01 is input from the communication line 6-X1 via the network node terminal to which the network node terminal address “G100” is assigned. The network node device 5-X receives the IP packet PK01 (step S100), and the network node terminal address “G100” is “source network node in the address management table shown in FIG. 3 inside the network node device 5-X. A search is made for a record registered in the “terminal address” field, and it is checked whether the request identification value of this record is “3” (step S101). In this embodiment, since the request identification value is not “3” and is not called a virtual leased line connection (case 1), the address “A100” (SA) of the source terminal 8-1 from the IP packet PK01 is next. The address “A200” (DA) of the destination terminal 8-2, the source port number “4300” (SP) for identifying the application program in the source terminal 8-1 and the destination terminal 8-2 The destination port number “300” (DP) for identifying the internal application program is read (step S102), the address management table set in the network node device 5-X is searched, and the transmission source A record in which the address “A100” (SA) of the terminal and the address “A200” (DA) of the destination terminal match both the addresses is detected (step S10). ). However, there are usually multiple records that satisfy this condition.

  Next, since there is one record that includes any one of the source port number “4300” (SP) and the destination port number “300” (DP) in the detected plurality of records, this record Is detected (step S104). In the present embodiment, the record in the first line from the top of the address management table of FIG. 3, that is, “SA = A100, DA = A200, P = 300, N-SA = G100, N-DA = G200”, network identifier Is a record of “NWa (Video-net)”. Here, the source network node terminal address “G100” and the destination network node terminal address “G200” are acquired, and the process proceeds to step S106. Here, the network node terminal address may be implemented as the above-described IP address, that is, an address required for the third layer of OSI (Open Systems Interconnection), or an address required for the second layer of OSI, for example, FR (Frame Relay). It is also possible to use an address used in the field of exchanges and ATM (Asynchronous Transfer Mode) exchanges (for example, telephone numbers defined in E.164).

  In step S100, if another IP packet PK05 is input from the communication line 6-X2 via the network node terminal to which the network node terminal address “G110” is assigned, the network node device 5-X receives the IP The packet PK05 is received, and the network node terminal address “G110” is searched for a record registered in the “source network node terminal address” column of the address management table in the network node device 5-X. It is checked whether or not the “request identification” value of the record is “3” (step S101). In this embodiment, since it can be detected as a record (record on the second row from the top of the address management table) whose value of “request identification” is “3”, it is an embodiment called virtual leased line connection (case) 2) Go to step S105. Then, the source network node terminal address “G110” and the destination network node terminal address “G210” registered in the specific record are acquired, and the process proceeds to step S106.

  Next, the integrated IP transfer network header shown in FIG. 4 is added to generate an integrated IP transfer network packet PK11 (step S106). Here, the source network node terminal address “G100” or “G110” (N-SA) acquired in step S104 or step S105 and the destination network node terminal address “G200” or “G210” (N-DA) are used. Use. Next, the integrated IP transfer network packet PK11 generated by the above procedures is sent to the communication line 7-1 according to the network identifier designated "NWa" (IP image network) (step S107). This communication line 7-1 is connected to an IP image network 2-X operated by a communication company X inside the IP image network 2.

  In step S105, depending on whether the network identifier designation of the received IP packet PK01 is “NWc” (IP telephone network) or “NWb” (IP versatile transfer network), Switched to a telephone network or an IP multipurpose transfer network.

  Next, the integrated IP transfer network packet PK11 is transferred through the IP image network 2-X, transferred through the IP packet switching point 2-1, and transferred through the IP image network 2-Y of the communication company Y to the network node. Device 5-Y is reached. As shown in the flowchart of FIG. 5, the network node device 5-Y first receives the integrated IP transfer network packet PK11 (step S120), and removes the IP transfer network header from the received integrated IP transfer network packet to generate an IP packet for LAN. (Step S121), and the restored IP packet is transmitted to the terminal 8-2 via the communication line 6-Y (step S122).

  On the other hand, when the terminal 8-2 in the LAN 2 transfers a new IP packet PK02 in the reverse direction to which the IP packet PK11 is transferred, the address and port number inside the IP packet are opposite to the IP packet. . That is, the address “A200” of the source terminal of the IP packet, the address “A100” of the destination terminal of the IP packet, the source port number “300” for identifying the application program inside the source terminal, and the application inside the destination terminal The destination port number for identifying the program is “4300”. In this case, the address management table shown in FIG. 6 is used, and the designation of port selection is reversed.

  Note that the IP packet switching point 2-1 measures the number of IP packets passing therethrough and the passage time of the IP packets, and manages the communication company X that manages the IP image network 2-X and the image network 2-Y. The communication company Y can count the number of passages and the passage time of the IP packet and use it as data for calculating a communication fee to the IP packet sender / receiver. Further, the present invention can be implemented even when the IP image network 2-Y of the communication company Y and the IP packet switching point 2-1 do not exist, that is, the IP image network 2 includes only the IP image network 2-X of the communication company X. . In this case, the communication company operating the IP image network 2 is one company “X”. Similarly, the present invention can be implemented even if the IP telephone network 4 includes only the IP telephone network 4-X of the communication company X.

  Next, the case where the terminal is an image transmission / reception device or an IP telephone and the communication line connected to the logical terminal of the network node device is connected to the IP image network 2-X or the IP telephone network 4-Y alone will be described. To do. In FIG. 1, reference numeral 9-1 denotes an image transmission / reception device, which is connected to the network node device 9-3 via the communication line 9-2 and further connected to the IP image network 2-X via the communication line 9-4. Connected. Reference numeral 10-1 denotes an IP telephone, which is connected to the network node device 10-3 via the communication line 10-2 and further connected to the IP telephone network 4-Y via the communication line 10-4. . Here, the communication company X operates the network node device 9-3, and the communication company Y operates the network node device 10-3. In each of the network node devices 9-3 and 10-3, an address management table created based on the same principle as in FIG. 3 or FIG. 6 is set.

  In such a configuration, for example, an IP packet including image information transmitted from the image transmission / reception device 9-1 as digital information includes a network node device 9-3, an IP image network 2-X, an IP packet switching point 2-1, An image transmission / reception program and image digital information in the terminal 8-2 can be exchanged via the IP image network 2-Y, the network node device 5-Y, and the communication line 6-Y. Similarly, for example, an IP packet including voice information transmitted from the IP telephone 10-1 as digital data includes a network node device 10-3, an IP telephone network 4-Y, an IP packet switching point 4-1, and an IP telephone network. Voice digital information can be exchanged with a telephone transmission / reception program in the terminal 8-1 via 4-X, network node device 5-X, and communication line 6-X1.

In the first embodiment, the IP transfer network is an IP telephone network and an IP image network. However, as other IP transfer networks, for example, an IP fax network dedicated to a fax, an IP electronic document switching network dedicated to an electronic slip exchange, for example. In addition, each IP transfer network can be used for each application, such as an IP exchange exchange network dedicated to exchange exchange.

2. Second embodiment for selecting an IP network only by IP address:
As shown in FIG. 7 corresponding to FIG. 1, the network node terminal address “G105” used inside the integrated IP transfer network is assigned to the network node terminal of the communication line 6-X1, and the communication line 6 The network node terminal address “G115” is assigned to the network node terminal of −X2. For example, the transmission source terminal 8-3 in the LAN 3 transmits the IP packet PK03 to the destination terminal 8-4 in the LAN 4. The IP packet PK03 includes an address “A105” of the transmission source terminal 8-3, an address “A205” of the destination terminal 8-4, and transmission data. Here, the transmission data is data handled by a voice telephone transmission / reception program, an image transmission / reception program, an electronic voucher transmission / reception program, a WWW data transmission / reception program operating according to a known HTTP protocol, and the like. The voice telephone transmission / reception program refers to a telephone transmission / reception program for an IP telephone using digital technology.

  In such a configuration, the operation will be described with reference to the flowchart of FIG. First, the IP packet PK03 is input from the communication line 6-X1 via the network node terminal to which the network node terminal address “G105” is assigned, and the network node device 5-X receives the IP packet PK03 (step S200). The network node terminal address “G105” is searched for a record described in the “source network node terminal address” column of the address management table in the network node device 5-X, and the “request identification” of this record is searched. It is checked whether or not the value of “3” is “3” (step S201). In the present embodiment, the request identification value is not “3”, and the virtual private line connection is not performed (case 1). Therefore, the address “A105” (SA) and the destination of the transmission source terminal 8-3 from the IP packet PK03 The address “A205” (DA) of the terminal 8-4 is read (step S202), the address management table shown in FIG. 9 set in the network node device 5-X is searched, and the address “of the transmission source terminal” A record is detected in which A105 "(SA) and the address" A205 "(DA) of the destination terminal coincide with both the addresses (step S203). In the present embodiment, the record in the first line from the top of the address management table of FIG. 9, that is, “SA = A105, DA = A205, N-SA = G105, N-DA = G205”, and the network identifier is “NWa ( Video-net) ”record. Here, the source network node terminal address “G105 and the destination network node terminal address” G205 are acquired, and the process proceeds to step S206. Here, the network node terminal address may be implemented as the above-mentioned IP address, that is, an address required for the third layer of the OSI, or an address required for the second layer of the OSI, such as an FR switch or an ATM switch. It is also possible to carry out using an address (such as a telephone number defined in E.164).

  In step S200, if another IP packet PK15 is input from the communication line 6-X2 via the network node terminal to which the network node terminal address “G115” is assigned, the network node device 5-X The packet PK15 is received. Then, the network node terminal address “G115” is searched for a record registered in the “source network node terminal address” column of the address management table in the network node device 5-X. It is checked whether or not the value of “request identification” is “3” (step S201). In this embodiment, since it can be detected as a record (record on the second row from the top of the address management table) whose value of “request identification” is “3”, that is, an embodiment of virtual leased line connection (case 2). In step S205, the source network node terminal address “G115” and destination network node terminal address “G215” registered in the specific record are acquired, and the process proceeds to step S206.

  Next, an integrated IP transfer network header as shown in FIG. 10 is added to generate an integrated IP transfer network packet PK13 (step S206). Here, the source network node terminal address “G105” or “G115” (N-SA) acquired in step S203 or step S205 and the destination network node terminal address “G205” or “G215” (N-DA) are used. Use. Then, the integrated IP transfer network IP packet PK13 generated by the above procedure is sent to the communication line 7-1 in accordance with the network identifier designated “NWa” (IP image network) (step S207). The communication line 7-1 is connected to the IP image network 2-X operated by the communication company X inside the IP image network 2. In step S205, depending on whether the network identifier designation of the received IP packet PK03 is “NWc” (IP telephone network) or “NWb” (IP versatile network), the IP image network Or switched to an IP multipurpose network.

  The integrated IP transfer network packet PK13 is transferred inside the IP image network 2-X, transferred inside the IP image network 2-Y of the communication company Y via the IP packet switching point 2-1, and the network node device 5- Y is reached. As shown in the flowchart of FIG. 11, the network node device 5-Y receives the integrated IP transfer network packet PK13 (step S220), and restores the IP packet for LAN by removing the IP header from the received integrated IP transfer network packet. (Step S221), the restored IP packet is transmitted to the terminal 8-4 via the communication line 6-Y (Step S222). The IP packet switching point 2-1 measures the number of IP packets passing through the IP packet passing point and the passage time of the IP packet, and measures the communication company X that manages the IP image network 2-X and the communication company that manages the image network 2-Y. Y measures the number of IP packets and the transit time, and can be used as ground data for calculating a communication fee to the IP packet sender / receiver.

In the second embodiment, the IP image network 2-Y of the communication company Y and the IP packet switching point 2-1 do not exist, that is, the IP image network 2 includes only the IP image network 2-X of the communication company X. You may make it. In this case, the communication company operating the IP image network 2 is one company “X”. Similarly, the present invention can be implemented even if the IP telephone network 4 includes only the IP telephone network 4-X of the communication company X.

3. Third embodiment using a separate domain name server:
As shown in FIG. 12, an IP voice image network 32, an IP data network 33, an IP telephone network 34, and a best effort network 35 are provided in an integrated IP transfer network 31. The IP audio image network 32 is an IP transfer network similar to the IP image network, but is an IP transfer network that can transfer both an image and sound corresponding to the image, for example, an image for movie or TV broadcasting and the sound. The IP data network 33 has a function similar to that of the IP electronic text network. In addition to electronic text data composed of characters, the IP data network 33 can transfer data other than electronic text, such as data obtained by compressing still images. It is a transfer network. The best effort network 35 has a function of performing IP telephone communication, IP voice image communication, and IP data communication. When communication traffic congestion occurs during IP transfer, communication delay occurs or IP packet discard increases. This is an IP transport network that the user knows to use, for example, the Internet is a typical IP best effort network.

  35-1, 35-2, 35-3, 35-4, 35-5, and 35-6 in the integrated IP transfer network 31 are network node devices, and these network node devices are communication lines 37-1 to 37. The network node terminal of the network node device is connected to any one of the IP transport networks 31 (IP voice image network 32, IP data network 33, IP telephone network 34, best effort network 35) via -20. Integrated IP transfer via any of communication lines 36-1, 36-2, 36-3, 36-4, 36-5, 36-6, 36-7, 36-8, 36-9, 36-10 Connected to external terminals 42-1, 43-1, 44-1, 42-2, 43-2, 44-2 of the network 31 and internal terminals of the LAN 31, LAN 32, LAN 33, and LAN 34, the network node Each device has its own address management table. The IP address of the terminal registered in advance and the port number for identifying the application of the terminal are written in this address management table.

  The IP transfer network 31 (IP voice image network 32, IP data network 33, IP telephone network 34, best effort network 35) includes domain name servers 45-1, 45-2, 45-3, dedicated for each network. 45-4, 45-5, 45-6, 45-7, and 45-8. These domain name servers are assigned host names and IP addresses assigned to the external terminals 42-1 to 44-2. 1 correspondence is held.

  A network node terminal address “G361” used in the integrated IP transfer network 31 is assigned to the network node terminal of the communication line 36-1. Here, the network node terminal is a logical boundary between the network node devices 35-1 to 35-6 and the communication line outside the integrated IP transfer network 31, and each network node terminal has a network node terminal address. Is granted. Further, the network node terminal address “G362” is assigned to the network node terminal of the communication line 36-2, the network node terminal address “G366” is assigned to the network node terminal of the communication line 36-6, and the network node of the communication line 36-7. The network node terminal address “G367” is assigned to the terminal, the network node terminal address “G368” is assigned to the network node terminal of the communication line 36-8, and the network node terminal address “G3610” is assigned to the network node terminal of the communication line 36-10. Are assigned to each.

  FIG. 13 shows a specific example of an address management table inside the network node device 35-1. The domain name server is given a network node terminal address and an IP address, and is used as an address when sending and receiving IP packets.

  Next, for example, a method for telephone communication from the IP telephone 38-1 in the LAN 31 to the IP telephone 40-1 in the LAN 33 will be described with reference to FIGS. The IP telephone 38-1 has an IP address “A381”, and the IP telephone 40-1 has a telephone number “T401” and an IP address “A401” corresponding to the host name of the terminal. The domain name server 45-3 is an example in which the IP address is “A453” and the network node terminal address is “G453”.

First, the IP telephone 38-1 transmits to the network node device 35-1 an IP packet PK30 storing the telephone number “T401” of the communication destination terminal, that is, the destination IP telephone 40-1 (step S401). From the received IP packet PK30, the network node device 35-1 receives the address “A381” (SA) of the source IP telephone 38-1 and the IP address “A453” (DA) of the destination domain name server 45-3. And the port number “25” is read out, the address management table (FIG. 13) set in the network node device 35-1 is searched, and the address “A381” ( (SA), the address “A453” (DA) of the destination domain name server 45-3, and the port number “25” are detected as a record in which both the addresses and the port number match (step S402). In the case of the present embodiment, the record in the first line from the top of the address management table of FIG. 13, ie, “SA = A381, DA = 453, N-SA = G361, N-DA = G453”. Here, the source network node terminal address “G361” and the destination network node terminal address “G453” are acquired, and the PK31 of the IP packet obtained by adding the integrated IP transfer network header is transferred to the domain name server 45-3. (Step S403).

  The domain name server 45-3 receives the IP packet PK31, searches the internal database for the IP address “A401” corresponding to the telephone number “T401” of the destination IP telephone 40-1, and returns it ( In step S404, the network node device 35-1 returns the IP packet PK32 to the IP telephone 38-1 (step S405). With the above procedure, IP telephone 38-1 obtains IP address “A401” corresponding to 1: 1 for communication destination telephone number “T401”.

  Next, the IP telephone 38-1 digitally represents the IP address “A381” of the source IP telephone 38-1, the IP address “A401” of the destination telephone, and the voice part of the IP packet (data part). ) Included in “), and transmits this packet to the communication line 36-1 (step S406), after which the network node device 35-1 receives the IP packet PK33, The address “A381” (SA) of the source IP telephone 38-1, the address “A401” (DA) of the destination IP telephone 40-1, and the port number “4000” are read out from the packet PK33 and stored therein. The set address management table (FIG. 13) is searched, and the address “A381” (SA) of the source IP telephone 38-1 and the destination And P phone 40-1 destination terminal address "A401" (DA), the port number "4000" and is, to detect the matching records each with the two address and port number (step S407). In the case of the present embodiment, the record in the second line from the top of the address management table of FIG. 13, that is, “SA = A381, DA = 401, port number = 4000, N-SA = G361, N-DA = G366”. . Here, the PK 34 of the integrated IP transfer network packet obtained by acquiring the source network node terminal address “G361” and the destination network node terminal address “G366 and adding the integrated IP transfer network header is the IP telephone network 34. -Transferred to X (step S408).

  The packet PK 34 passes through the IP telephone network 34-Y via the packet switching point 34-1 and the network node device 35-4 receives the IP packet PK 34 (step S421), and receives a header from the received packet PK 34. The IP packet PK33 is restored (step S422), and the IP packet PK33 is transmitted to the telephone set 40-1 (step S423). In step S407, the two types of IP addresses are compared with the port numbers. However, some records in the address management table do not include the port numbers. In such a case, the port numbers are compared. Instead, two types of IP addresses may be compared.

  As described above, the network node terminal address is implemented as the IP address required for the third layer of the OSI, as well as an address required for the second layer of the OSI, for example, an address (E used in the field of FR switch or ATM switch). .164 standard telephone number) and a two-layer protocol based on WDM technology. When the address required for the second layer is adopted, the “integrated IP transport network header” shown in FIG. 20 employs a header of a two-layer communication protocol such as ATM or WDM.

  Next, a description will be given with reference to the timing chart of FIG. In FIG. 22, 49-1 and 49-2 represent various terminals placed outside the integrated IP transfer network 31, and an IP packet is transmitted from the terminal 49-1 to the network node device 35-1 (step S401). Then, it is transferred to the domain name server 45-3 used exclusively for the IP telephone network 34 (step S403). Then, it is returned from the domain name server (steps S404 and S405), an IP packet is transmitted from the terminal 49-1 to the network node device 35-1 (step S406), and an integrated IP packet network is transmitted from the network node device 35-1. Then, the other network node device 35-4 receives the packet via the packet switching point 34-1 for the IP telephone network 34 (step S421), and the IP packet is received from the network node device 35-4 by the terminal 49-2. (Step S423). Further, the IP packet can be returned from the terminal 49-2 to the terminal 49-1 (step S425).

  Furthermore, the step of sending and receiving the IP packets in steps S431 to S455 shown in FIG. 22 uses the IP data transfer network 33, that is, the domain name server 45-2 and the IP data network 33 used exclusively for the IP data network 33. Data can be transmitted and received between the terminal 49-1 and the terminal 49-2 via the internal packet switching point 33-1. Further, the steps of sending and receiving the IP packets in steps S461 to S485 shown in FIG. 22 by using similar steps use the IP voice image network 32, that is, the domain name server 45-1 used exclusively for the IP voice image network 32. In addition, data can be transmitted and received between the terminal 49-1 and the terminal 49-2 via the packet switching point 32-1 for the IP voice image network 32.

  In the above description, the IP audio image network 32-Y of the communication company Y and the case where the IP packet switching point 32-1 does not exist, that is, the IP audio image network 32 is only the IP audio image network 32-X of the communication company X. Can be implemented. In this case, the communication company operating the IP audio image network 32 is one company “X”. Similarly, the IP data network 33 can be implemented to include only the IP data network 33-X of the communication company X, the IP telephone network 34 can be implemented to include only the IP telephone network 34-X of the communication company X, and The best effort network 35 may be implemented so as to include only the IP telephone network 35-X of the communication company X.

In FIG. 12, 46-1, 46-2, 46-3, 46-4 are ATM switching networks, 47-1 and 47-2 are FR communication networks, 48-1 and 48-2 are optical communication networks, This is an example used as a high-speed trunk network for transferring IP packets inside an IP transfer network. In these cases, for example, “IP transfer using FR network” (IP over FR), “ATM network using network” Techniques commonly called “IP transfer” (IP over ATM), “IP transfer using optical communication network” (IP over WDM), and the like are applied.

4). Fourth embodiment for selecting a domain name server:
As shown in FIG. 23, an IP voice image network 132, an IP data network 133, an IP telephone network 134, and a best effort network 135 are provided in the integrated IP transfer network 131. 136-1, 136-2, 136- Reference numerals 3, 136-4, 136-5, 136-6, 136-7, and 136-8 are network node devices. The network node devices 136-1 to 136-8 are connected to any one or more networks of the IP transfer network via communication lines, while the network node terminals of the network node devices are communication lines 140, 141, 142. , 143, 144, and 145, are connected to the external terminals 151, 152, 153, and 154 of the integrated IP transfer network 131, and the internal terminals of the LAN 160 and LAN 170, and the network node device is assigned to the external terminal therein. The IP address and the port number are held as an “address management table”.

  The integrated IP transfer network 131 includes domain name servers 112-1 and 112-2 used exclusively for the IP audio / video network 132, and further includes domain name servers 113-1 and 113-2 used exclusively for the IP data network 133. In addition, domain name servers 114-1 and 114-2 used exclusively for the IP telephone network 134 and domain name servers 115-1 and 115-2 used exclusively for the best effort network 135 are included. These domain name servers maintain a 1: 1 correspondence between the IP address of the external terminal and the host name of the terminal. Reference numeral 101-1 connected to the network node device 136-6 is a “DNS selection server having a function of selecting one of the domain name servers 112-1, 113-1, 114-1, and 115-1, 101-2 connected to the node device 136-2 is a “DNS selection server having a function of selecting any one of the domain name servers 112-2, 113-2, 114-2, and 115-2. 137-1 in the integrated IP transfer network 131 represents the range of the IP network managed by the communication company X, and 137-2 in the integrated IP transfer network 131 represents the range of the IP network managed by the communication company Y. The IP network 137-1 includes a DNS selection server 101-1, and domain name servers 112-1, 113-1, 114-1, 115-1, and 137-1 includes a DNS selection server 101-2. Domain name servers 112-2, 113-2, 114-2, and 115-2.

  Next, the operation will be described with reference to FIGS.

In FIG. 24, 160-T and 170-T represent terminals in the LAN 160 and LAN 170, respectively. First, the IP packet 181 is transmitted from the voice image terminal 161 to the network node device 136-6 (step S601), and the network node device 136-6 transfers the IP packet 181 to the DNS selection server 101-1 (step S602). Since the DNS selection server 101-1 finds a symbol for specifying an IP transfer network included in “aa.bb.cc.audio-vidual.jp” in the data portion of the IP packet, in this case “audio-vidual”, The IP packet 181 shown in FIG. 25 is transferred to the domain name server 112-1 targeted for the IP voice image network (step S603). The domain name server returns an IP packet including an IP address corresponding to 1: 1 from the host name “aa.bb.cc.audio-vidual.jp” to the terminal 161 (step S605). Next, the terminal 161 transmits an IP packet to the terminal 171 located at the IP address corresponding to 1: 1 “aa.bb.cc.audio-vidual.jp” acquired in the above step (steps S606 and S607). ) When receiving the IP packet, the terminal 171 generates a reply IP packet and sends it back to the terminal 161 (step S608).
The case where the IP data communication terminal 162 transmits the IP packet 182 to the network node device 136-6 (step S611) is the same as described above, except that the DNS selection server 101-1 is different from that shown in FIG. A symbol that designates an IP transport network included in “aa.bb.cc.data.jp” in the data portion of the IP packet 182, in this case “data” is found, so that the IP packet is a domain that targets the IP data network Transfer to the name server 113-1 (step S613). The domain name server returns an IP address corresponding to 1: 1 from the host name “aa.bb.cc.data.jp” to the terminal 162 (step S615). Next, the terminal 161 transmits an IP packet to the terminal 172 located at the IP address corresponding to 1: 1 “aa.bb.cc.data.jp” acquired in the above step (steps S616 and S617). Upon receiving the IP packet, terminal 172 generates an IP packet for reply and returns it to terminal 162 (step S618).

  When the IP packet 183 shown in FIG. 27 is transmitted from the IP telephone 163 to the network node device 136-6 (step S621), the DNS selection server 101-1 is different from the IP packet 183 in the data. Since the symbol for designating the IP transfer network included in the part “aa.bb.cc.telephone.jp”, in this case “telephone”, is found, the IP packet 183 is assigned to the domain name server 114- 1 (step S623). The domain name server returns an IP address corresponding to 1: 1 from the host name “aa.bb.cc.telephone.jp” to the IP telephone 163 (step S625). Next, IP phone 161 transmits an IP packet to IP phone 173 located at the IP address corresponding to 1: 1 “aa.bb.cc.telephone.jp” acquired in the above step (step S626, step S626). When the IP phone 173 receives the IP packet, the IP phone 173 generates a reply IP packet and sends it back to the IP phone 163 (step S628).

  In the case where there is no symbol specifying any of the IP voice image network, IP data network, and IP telephone network in the data portion of the IP packet 184 of FIG. 28 from the terminal 164, the DNS selection server 101-1 sets the best effort network 135. The target domain name server 115-1 is selected. Hereinafter, the terminal 164 performs IP communication with the terminal 174 using the best effort network 135. In this way, IP communication using the IP voice image network, IP communication using the IP data network, communication using the IP telephone network, and communication using the best effort network can be performed between the two terminals.

1 is a schematic block diagram showing a first embodiment of the present invention. It is a flowchart which shows the operation example of the network node apparatus of 1st Example of this invention. It is an example of the address management table handled in 1st Example of this invention. It is explanatory drawing of the packet transmitted / received in 1st Example of this invention. It is a flowchart which shows the other operation example of the network node apparatus of 1st Example of this invention. It is another example of the address management table handled in 1st Example of this invention. It is a typical block diagram which shows 2nd Example of this invention. It is a flowchart which shows the operation example of the network node apparatus of 2nd Example of this invention. It is an example of the address management table handled in 2nd Example of this invention. It is explanatory drawing of the packet transmitted / received handled in 2nd Example of this invention. It is a flowchart which shows the other operation example of the network node apparatus of 2nd Example of this invention. It is a typical block diagram which shows 3rd Example of this invention. It is a figure which shows the example of the address management table used in 3rd Example. It is a figure which shows the example of the "packet transmitted / received" used in 3rd Example. It is a figure which shows the example of the "packet transmitted / received" used in 3rd Example. It is a figure which shows the example of the "packet transmitted / received" used in 3rd Example. It is a figure which shows the example of the "packet transmitted / received" used in 3rd Example. It is a figure which shows the example of the "packet transmitted / received" used in 3rd Example. It is a flowchart which shows the operation example of the network node apparatus of 3rd Example. It is a figure which shows the example of the IP packet used in 3rd Example. It is a flowchart which shows the other operation example of the network node apparatus of 3rd Example. It is a timing chart which shows the other operation example of the network node apparatus of 3rd Example. It is a typical block diagram which shows 4th Example of this invention. It is a figure for demonstrating transmission / reception of the IP packet used in 4th Example. It is a timing chart for demonstrating transmission / reception of the IP packet used in 4th Example. It is a figure for demonstrating transmission / reception of the IP packet used in 4th Example. It is a figure for demonstrating transmission / reception of the IP packet used in 4th Example. It is a figure for demonstrating transmission / reception of the IP packet used in 4th Example. It is a conceptual diagram explaining the IP transfer by the conventional internet. It is a conceptual diagram explaining multicast type IP transfer.

Explanation of symbols

1, 31, 131 Integrated IP transport network 2 IP image network 2-X IP image network 2-Y of communication company X Y IP image network 3 of communication company Y IP multipurpose network 3-X IP multipurpose network 3 of communication company X -Y Communication company Y's IP versatile network 4 IP telephone network 4-X Communication company X's IP telephone network 4 -Y Communication company Y's IP telephone network 2-1, 3-1, 4-1 IP packet switching point 5 -X, 9-3 Network node device 5-Y of communication company X, 10-3 Network node device 11-1, 11-2 of communication company Y Address management table rewriting device 20 IP transfer networks 22-1 to 22-4 Router 23-1, 23-2 Terminal 24-1, 24-2 Router 27-1 Multicast IP transfer network 32, 132 IP voice image network 33, 133 IP data network 34, 134 IP telephone network 35, 135 Best effort network

Claims (15)

The integrated IP transfer network includes a plurality of network node devices and a plurality of IP transfer networks, and each of the network node devices is connected to a plurality of terminals outside the integrated IP transfer network, each of which is at least one of the IP transfer networks When the IP packet transmitted from the originating terminal 1 reaches the originating network node device 1, it becomes an IP packet 3, and the IP packet 3 is one of the IP transfer networks connected to the network node device 1. When the IP packet is transferred to one and reaches the destination side network node device 2, the IP packet is restored from the IP packet 3, and the restored IP packet is transmitted to the destination terminal 2, whereby the terminal 1 and the In the method of communicating between terminals 2 via the integrated IP network, the network node device 1 uses the IP packet based on the port number in the IP packet. Communication method 3 and determines the IP transfer network to be transferred. The integrated IP transfer network includes a plurality of network node devices and a plurality of IP transfer networks, the network node device includes two or more network node terminals, and each of the network node devices includes a plurality of network nodes outside the integrated IP transfer network. An IP packet connected to a terminal and connected to at least one or more of the IP forwarding networks and transmitted from the originating side terminal 1 becomes an IP packet 3 when reaching the originating side network node device 1, and the IP packet 3 is When the packet is transferred to any one of the IP transfer networks connected to the network node device 1 and reaches the destination-side network node device 2, the IP packet is restored from the IP packet 3, and the restored IP packet is sent to the destination In the method of performing communication between the terminal 1 and the terminal 2 via the integrated IP network by being transmitted to the terminal 2, the network node device 1 Based on the port number of the P packet, the IP transfer network to which the IP packet 3 is transferred is determined, and based on the IP address in the IP packet and the network node terminal of the network node device 1 to which the IP packet is input And determining a network node terminal of the network node device 2. The communication method according to claim 1 or 2, wherein an IP transfer network through which the IP packet passes is determined based on an IP address instead of a port number. The communication method according to claim 1, wherein at least one of the IP transfer networks is an IP telephone network. The communication method according to claim 1, wherein at least one of the IP transfer networks is an IP data network. The communication method according to claim 1 or 2, wherein at least one of the IP transfer networks is an IP-based TV broadcast network. The integrated IP transfer network includes a plurality of IP transfer networks and a plurality of network node devices, and the network node devices are connected to any one or more of the IP transfer networks via a communication line. The node terminal is connected to one of a plurality of terminals outside the integrated IP transfer network via a communication line, and the IP transfer network includes a domain name server used exclusively for each IP transfer network, The domain name server holds a correspondence relationship between the IP address of each terminal and the host name of each terminal, and the network node device 1 is addressed to any one of the domain name servers from the terminal 1 that is the transmission source. When the IP packet is received, the received IP packet is transferred to the destination domain name server, and the destination domain name server receives the destination included in the received IP packet. The IP address of the terminal 2 corresponding to the host name of the terminal 2 is indexed, and the obtained IP packet including the IP address of the terminal 2 is returned to the terminal 1, and the terminal 1 When a new IP packet in which the IP address of the terminal 2 acquired from the name server is set is generated and the generated IP packet is transmitted to the network node device 1, the network node device 1 stores the IP packet in its address management table. A record including an IP address of a registered source terminal, an IP address and a port number of a destination terminal, an IP address of the terminal 1 and an IP address and a port number of the terminal 2 included in the IP packet; By comparing these, a record indicating an IP transport network that is a transfer destination of a new integrated IP transport network packet including the IP packet is obtained. And the integrated IP transfer network packet is generated by using the terminal address of the network node device 1 and the network node terminal address of the network node device 2 included in the specified record, and the IP transfer as the transfer destination When transmitted to the network, the integrated IP transfer network packet is transferred through the IP transfer network as the transfer destination including the domain name server indexed by the IP address of the terminal 2 and reaches the network node device 2 on the destination side. The network node apparatus 2 restores the IP packet except for the integrated IP transfer network header and transmits the IP packet to the terminal 2.
The IP transfer network includes a domain name server, the domain name server indexes the IP address of the destination terminal corresponding to the host name of the destination terminal, and returns an IP packet including the obtained IP address to the source terminal, Since the transmission source terminal generates a new IP packet in which the acquired destination terminal IP address is set, communication between the transmission source terminal and the destination terminal is started. A communication method, wherein an IP transfer network including the domain name server is transferred from a network node device on a side to reach a network node device on a transmission side. 8. The communication method according to claim 7, wherein only the network terminal address is compared, and the port number is not compared. 8. At least one of the network node devices is connected to an IP voice image network inside the IP transfer network, and is connected to the IP voice image device via a network node terminal of the network node device outside the IP transfer network. The communication method described in 1. 8. The network node device according to claim 7, wherein at least one of the network node devices is connected to an IP telephone network inside the IP transfer network, and is connected to an IP voice image device via a network node terminal of the network node device outside the IP transfer network. Communication method. At least one of the network node devices is connected to a best effort network inside the IP transfer network, and is connected to an IP terminal, an IP telephone, or a voice image device via a network node terminal of the network node device outside the IP transfer network. The communication method according to claim 7. At least one of the network node devices is connected to an IP multicast network inside the IP transfer network, and is connected to an IP terminal, an IP telephone, or a voice image device via a network node terminal of the network node device outside the IP transfer network. The communication method according to claim 7. At least one of the network node devices is connected to an IP-based TV broadcasting network inside the IP transfer network, and is connected to an IP terminal, an IP telephone, or a voice image device via the network node terminal of the network node device outside the IP transfer network. The communication method according to claim 7. 8. The communication method according to claim 7, wherein a domain name server DNS selection server having a function of selecting a domain name server for individual use of the IP transfer network is included in the IP transfer network. Of the plurality of IP transfer networks included in the integrated IP transfer network, at least one IP transfer network does not include a domain name server, and at least one IP transfer network includes a domain name server. When an IP packet that is not addressed to any of the domain main servers is transmitted and the IP packet reaches the network node device 1, the IP packet becomes an integrated IP forwarding network packet and does not include the domain name server. The IP packet is restored from the IP transfer network packet and transferred to the terminal 4 from the network node device 2 when transferred to one of the transfer networks and reaches the network node device 2. 8. The communication method according to 7.

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