KR100194574B1 - Network Interworking Device and Application Method for Native ATM Application Program Interface Application - Google Patents

Abstract

The present invention relates to a network interworking device and a method of interworking for a native ATM application program interface (API) application, in order to solve the problem that the conventional ATM API technology in the prior art was limited and used only in a pure ATM network In the present invention, the cell-type data of the ATM network generated by the native ATM API can be communicated using the native ATM API not only in the ATM network but also through the Internet (Internet Protocol) network. By interlocking routers between two networks so that they can be transmitted through an IP network in a packet form of data used in an IP network, a wide spread of applications using native ATM APIs is possible.

Description

Interworking Device and Method for Native ATM API Appications

The present invention relates to the field of interworking between networks in relation to the use of a communication service of an ATM network, and in particular, to allow data transmission between applications using a native ATM API not only over an ATM network but also over an IP network. The present invention relates to a network interworking device for a native ATM application program interface application and an interworking method thereof.

In the prior art, there are several ways in which an application uses ATM services, such as IP over ATM (LAN) or LAN Emulation over ATM (ATM). These methods raise the existing transport and network layer protocols such as TCP / IP or SPX / IPX on the ATM layer, and the application delays the processing delays caused by these protocol stacks. exist. On the other hand, using native ATM API directly accesses the ATM layer service, which has the advantage of supporting faster transmission processing and guaranteed quality of service. Therefore, as the spread of ATM networks increases, the use of native ATM APIs is expected to spread.

However, the native ATM API technology to date has a limitation that its use is limited to the ATM network.

The reason why the native ATM API technology, which can provide the best performance and function among ATM communication services, is not widely used is that data cannot be transmitted through widespread IP networks. will be.

Therefore, in order to solve the above problem, the present invention provides data transmission between applications using a native ATM API not only through an ATM network but also through an IP network.

FIG. 1 is a diagram illustrating an interworking router device for transmitting data in an Internet Protocol (IP) network for native ATM API application and an interworking method thereof for explaining the interworking method thereof.

2 is a diagram illustrating a type of an interworking routing table required for transmitting ATM data received in an interworking router device to an appropriate destination interworking router in an IP network by referring to an ATM address and a VPI / VCI value.

3 is a linkage relationship diagram using a linkage routing table and a linkage router device according to an embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

1,2,3: application A, B, C 7, 8: first, second interlocking router

9: native ATM API

Network interworking apparatus of the present invention for achieving the above object, IP (Internet Protocol) between the different ATM networks to transfer data between the applications connected to each of the different ATM networks using a native ATM application program interface (API) One feature is installed between the ATM network and the IP network to transmit data through the network, so that the data type can be changed between the ATM network and the IP network according to the data transmission direction, and addressing is possible in each network. There is this.

When the data transmission direction is transmitted from one ATM network to the other ATM network, the network interworking device converts ATM cell data input to one ATM network into IP packet data and converts the data into an IP packet type according to the converted ATM address. A first interworking router configured to route to a desired destination in the network; The second interworking router is configured to restore the ATM cell data included in the IP packet routed by the first interworking router and deliver the data to the other ATM network.

In addition, when the data transmission direction is transmitted from the other ATM network to the one ATM network, data of the first interworking router and the second interworking router are interchanged.

In addition, the network interworking method of the present invention comprises the first step of converting the data form transmitted between the ATM network and the IP network to the form of the network according to the data transmission direction provided with the network interworking device as described above; A second step of viewing the ATM address included in the data transmitted to the network interworking device and routing to the desired destination in the IP network; In addition, there is another feature possible by performing a third process of restoring ATM cell data included in the routed IP packet.

In addition, in the three networks, the flow of 2 consists of cell units, and the data flow of IP networks consists of packet units.

Therefore, in order to transfer data from the ATM network to the IP network, the switching between the ATM data type of the cell unit and the IP data type of the packet unit must be performed. This data / IPRKS data conversion is used in IP technology over ATM. However, IP over ATM converts IP packets into ATM cells and transmits them to the ATM network from the IP perspective, which is different from converting ATM-oriented cell data created by the native ATM API to be implemented in the present invention into IP packets. .

The present invention can be seen as a reverse use of a method of converting data of IP into data of ATM so that it can be transmitted in an ATM network. That is, a method of converting ATM data into IP data so that it can be transmitted in an IP network using Ethernet or a token ring. At this time, the data is ATM-oriented cell data generated by the native ATM API, and cell-to-packet switching is a different technique from packet-to-cell switching in IP over ATM. That is, in IP over ATM, all IP data must be included in ATM cell data and transmitted. However, in the present invention, all ATM cell data must be included in IP packet data and transmitted.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. Prior to the description, the applications A, B, and C will be described as the applications A, B, and C below.

FIG. 1 illustrates data exchange 14 between Application A (1) and Application C (3) as an example for explaining the interworking between the ATM network and the IP network.

In FIG. 1, a data exchange form 13 between Application A 1 and Application B 2 is also shown to compare and explain the communication environment of an application using the existing native ATM API 9 technology. It was. Since the data exchange form 13 between the application A (1) and the application B (2) is performed only in the ATM network 4, the native ATM API technology may be used as it is. However, current native ATM API technology does not allow data exchange 14 between applications C (3). In order to enable this in the present invention, the first interworking router 7 in which the data of the application A 1 using the native ATM API is transferred from the ATM network 4 to the IP network 5 in this manner, and again, The second interworking router 8 transfers data from the transferred IP network 5 to another ATM network 6.

The first interworking router 7 should have the following three functions.

First, it transfers ATM cell data into IP packet form when moving from ATM network 4 to IP network 5, and second, it checks ATM address contained in ATM cell and finds the desired destination in IP network. Routing function that allows access, and third, the ability to restore ATM cell data contained in IP packets (this is the case when data is sent backwards from application C (3) to applications (1) and (2)). Have

The second interworking router 8 has the same function as the first interworking router 7 and the data transfer direction is transmitted from the application A, B (1, 2) to the application C (3) of the other ATM network 6. In this case, the data is transferred from the IP network 5 to another ATM network 6, and has only a function of restoring ATM cell data contained in an IP packet, and in the reverse direction, a restoration function of the first interworking router 7 described above. Has the first and second functions except That is, in an actual situation, the application A 1 and the application C 3 exchange data with each other, and the first interworking router 7 and the second interworking router should all have the same three functions.

Accordingly, when data is sent in both directions, when the ATM cell data contained in the IP packet data is restored, the application C (3) (or application A, B, (1), which is the desired destination, is made using the ATM address contained therein. 2)) is a basic function that can be achieved in the ATM network through the native ATM API (9).

When all three functions described above are included in the first and second interworking routers 7 and 8, data exchange between the application A 1 and the application C 3 is possible as shown in FIG.

That is, the entire cell data is contained in the data portion of the IP packet excluding the header information, and then restored to its original state after moving in the IP network.

In order to perform the second function, that is, the data restoration function, an interworking routing table as shown in FIG. 2 must be built in the first and second interworking routers 7 and 8. The function of using the interworking routing table of FIG. 2 will be described with reference to FIG. 3 and FIG. 1 as follows.

In the example of FIG. 3, the application A (1) using the native ATM API must first establish a connection with the application C (3) in order to exchange data with the application C (3).

To this end, application A (1) sends a connection establishment primitive containing the ATM address of application C (3). By this ATM address, the connection establishment primitive of the application A 1 first arrives at the first interworking router 7. The first interworking router 7 then interworks with the form of FIG. 2 therein, i.e., the VPI / VCI 15 from the application, the destination ATM address 16, and the interworking router IP address 17 to the destination. In the routing tables 18 and 19, the IP address 18c mapped with the ATM address 18a of the application C 3 is retrieved. At the same time, the first interworking router 7 has a corresponding column 18a of the row 18 mapped to the VPI / VCI number which has been connected to the first interworking router 7 to go to the application C 3 in this interworking routing table. Record it in The VPI / VCI 18a is a connection line VPI / VCI for data to be transmitted from the application A 1 to be delivered to the first interworking router 7 after connection establishment. The retrieved IP address is an IP address for going to application C (3), which is a desired destination, and is an IP address of the second interworking router 8 connected to the ATM network to which the application C (3) belongs. Therefore, the connection establishment primitive intended to go to this application C (3) is directly forwarded to the second interworking router 8 using this IP address (20), and the second interworking router (8) forwards the IP packet form. After receiving the data of A, it recovers the connection establishment primitive in the form of ATM cell from Application A (1) contained in this packet. The recovered ATM connection establishment primitive arrives at application C (3) by finally establishing a connection to application C (3) by its ATM address.

If the application C (3) allows the connection, the connection accept primitive of the application C (3) is applied in the reverse direction by using the forward connection between the application A (1) and the application C (C) thus established. The connection setup between the two applications A (1) and C (3) is completed. In this case, in the reverse direction, the functions of the above-described first interlocking router 7 in the forward linkage should be performed in the same way as in the forward direction. The function of the second interworking router 8 should be performed.

Once the connection is established in the above manner, data exchange between the two applications then uses the VPI / VCI of the established connection, and the first interworking router 7 and the second interworking router 8 When the connection is established, mapping the information 15 and the IP address 17 of the VPI / VCI recorded in the interworking routing table enables the search for the desired destination interworking router.

The creation of the interworking routing table used in the above method requires that the network manager establishes the interworking router and simultaneously transmits the ATM addresses of the applications in the ATM network to which the interworking router connects to the interworking routers. Exchange to set up interworking routing table.

As described above, the present invention broadens the use of the native ATM API application by enabling the use of the native ATM API application that can be used only in the ATM network through the IP network. In other words, it can be expected to spread the application and use of the native ATM API that provides excellent ATM communication service.

It is an object of the present invention to use native ATM APIs more widely by enabling data transfer of native ATM API applications over IP networks in addition to ATM networks.

Claims (8)

A network interworking apparatus for transmitting data between applications connected to each of different ATM networks using a native ATM application program interface (API), wherein the data is transmitted between the different ATM networks through an IP (Internet Protocol) network. In order to establish a native ATM application program interface application, it is installed between the ATM network and the IP network to switch the data type between the ATM network and the IP network according to the data transmission direction and to enable addressing in each network. Network interlock for According to claim 1, When the data transmission direction is transmitted from one ATM network to the other ATM network, ATM cell data input to one ATM network is converted into IP packet data and in the IP network according to the converted ATM address A first interworking router configured to route to a desired destination; And a second interworking router configured to restore ATM cell data contained in the IP packet routed by the first interworking router and transmit the data to the other ATM network. The method of claim 1 or 2, wherein when the data transmission direction is transmitted from the other ATM network to the one ATM network, the data is transmitted by changing the functions of the first interworking router and the second interworking router. Network interworking device for ATM application program interface application. 3. The network interworking apparatus of claim 2, wherein the first interworking router uses an interworking routing table for data routing. 4. The network interworking apparatus of claim 3, wherein the second interworking router uses an interworking routing table for data routing. Data is transmitted between the ATM network and the IP network by having a different network interworking router for transmitting data through the IP network between applications connected to each of different ATM networks using a native ATM application program interface (API). A first step of converting a form into a form of a corresponding network according to a data transmission direction; A second process of looking at an ATM address included in the transmitted data and routing it to a desired destination in an IP network; And a third process of restoring ATM cell data contained in the routed IP packet. 7. The method of claim 6, wherein the second process comprises: a first step of sending a connection establishment primitive containing an ATM address of another application, which is a destination, from an application of one ATM network to one network interworking router; In the interworking routing table, the IP address mapped to the ATM address of the other application by the one network interworking router is searched, and the corresponding column of the row where the VPI / VCI number for the other application is mapped to the table. Writing in the second step; Transmitting the connection establishment primitive to the other network interworking router by using the retrieved IP address of the other application program; Restoring a connection establishment primitive in the form of an ATM cell included in the packet by the other network interworking router receiving the forwarded IP packet data; After the restoration, the other application is transferred to the other application by the ATM address of the other application, and then the other application accepts the connection and forwards the connection acceptance primitive of the application to the one application in the reverse direction. Performing a fifth step of completing data exchange using the VPI / VCI and mapping the VPI / VCI information and the IP address recorded in the interworking routing table to establish a connection to the destination network interworking router. Interworking method for native ATM application program interface application. 8. The network interworking method of claim 7, wherein the interworking routing table comprises a VPI / VCI from an application, a destination ATM address, and a interworking router IP address to a destination.