JP2716028B2 - Protocol converter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gateway device for executing a protocol conversion between an OSI protocol and a protocol other than the OSI in order to enable interconnection between the two protocols, and in particular, to transfer user binary data at high speed. Regarding protocol conversion method. OSI: Open Systems Interconnection An international standard communication protocol specified by the ISO (International Organization for Standardization).

2. Description of the Related Art An example of a conventional protocol conversion method between different protocols will be described with reference to an example of a published patent publication "Protocol Conversion Method" (Hei 1-297936).

FIG. 5 is a diagram showing a configuration of a protocol conversion device in the above-mentioned publication. In the invention of the publication,
In the conversion between the A protocol and the B protocol for interconnecting, a protocol conversion method called a direct conversion method for converting and relaying control information / transfer data at each layer, and once converting to a standard intermediate protocol, -Intermediate protocol-Combined with a protocol conversion method called an indirect conversion method that executes conversion and relay in the form of the B protocol. Specifically, the third model of the reference model
The indirect conversion method is used below the layer and the direct conversion method is used above the fourth layer. A in lower layer protocol conversion function (33A)
Protocol and the intermediate protocol X. 25 packet level protocol and the other lower layer protocol conversion capability (33B), which is the B protocol and the X.25 intermediate protocol. The protocol conversion of the third and lower layers is performed by converting to the 25-packet level protocol, and the upper layer protocol conversion function (32) directly converts the A and B protocols in the fourth and higher layers.

[0003]

In the conventional protocol converter described above, when applied to a protocol converter between the OSI protocol and a protocol other than OSI,
There is a disadvantage that the throughput is slow in transferring user data of an application, particularly user data in a binary format.

The reason will be described with reference to FIG. FIG.
FIG. 1 is an explanatory diagram of an operation of a conventional protocol conversion device. A conventional general protocol conversion for transferring user data in a binary format is as follows. After receiving notification from the transport layer to the session layer, perform header analysis of the session layer and conversion to a different (counterpart) protocol, perform reception notification of the SSDU (see note) to the presentation layer, and analyze the header of the presentation layer. Conversion to a different protocol from ANS. 1 (see note) and PSDU
(Refer to the note.) Notification of reception to the application layer, extraction of user data after processing of header analysis of the application layer and conversion to a different protocol, and notification of reception from the application layer to the application (AP). The correspondence between the OSI protocol path at the level and the different protocol path is obtained, and a request for transmitting user data is made to the corresponding different protocol path.

[0005] As described above, the user data goes through the above-described steps (processing from several kilo steps to several hundred kilo steps) despite the fact that the protocol conversion in the layer higher than the transport layer is not necessary. ), So the throughput was slow.

[0006] In the case where the protocol conversion between the OSI protocol and a different protocol is actually required, the old center using the existing proprietary protocol and the WAN are used.
In many cases, a new center / new terminal that supports only OSI as a system protocol is connected. In this case, the greatest purpose of the protocol conversion device is to transfer binary user data between different protocols. (Note) ANS. 1: Abstruct Syntax Notation one (ISO abstract syntax notation) TSDU: Transport Service Data Unit (Upper layer data unit handled by T layer) SSDU: Session Service Data Unit (Upper layer data unit handled by S layer) PSDU: Presentation Service Data Unit (upper layer data unit handled by P layer) TP: Transaction Proccesing (Distributed transaction processing (
One of the OSI application layer protocols)) TP-BEGIN-DIALOGUE: Dialog start primitive in TP protocol TP-END-DIALOGUE: Dialog end primitive in TP protocol TP-DATA: Data transfer primitive in TP protocol Object of the present invention Is an improvement in performance due to faster processing. Specifically, in the protocol conversion between the OSI protocol and a different protocol other than the OSI, user binary data received from the OSI side is extracted at an early stage and transferred to the different protocol side. It is to speed up data transfer.

[0007]

According to a first aspect of the present invention, there is provided an OSI side communication device which executes an OSI protocol and a different protocol side communication device which executes a different protocol different from the OSI. A protocol conversion device for performing a protocol conversion between the OSI communication device and an application of the OSI communication device (hereinafter referred to as an AP) and an AP of the different protocol communication device; The identification information (SO 1) of the OSI path which is the application path generated between the communication path and the identification information (S-1) of the different protocol path which is the application path generated between the different communication apparatus and the communication path. The transport path is uniquely identified between the transport layer and the session layer from the OSI path identification information (SO). Combined transport path identification information (S-TR) that can be distinguished is stored in the storage unit, and when data is transmitted from the AP of the OSI communication device to the AP of the different protocol communication device, the data is transmitted during the transport layer processing. If the transfer data is user data, the identification information (S-1) of the different protocol path is extracted from the transport path identification information (S-TR) by referring to the combination stored in the storage unit. The user data is transmitted to the AP of the different-protocol-side communication device according to the protocol path identification information (S-1).

[0008] A second aspect of the present invention resides in that an OSI-side communication device that executes an OSI protocol and a different-protocol communication device that executes a different protocol different from the OSI. An OSI protocol processing execution unit for performing the OSI protocol processing, a different protocol processing execution unit for performing the different protocol processing, and an OSI interface for controlling an interface with the OSI protocol processing execution unit Unit, a different protocol interface unit for controlling an interface with the different protocol processing execution unit, and a path generation between an application (hereinafter referred to as an AP) of the OSI communication device and an AP of the different protocol communication device. Sometimes, the OSI interface Scan section and the OSI path identification information is an application path that is generated between the OSI-side communication apparatus via the OSI protocol processing execution unit (S-
O), identification information (S-1) of a different protocol path, which is an application path generated between the different protocol side communication device via the different protocol interface unit and the different protocol processing execution unit, and the OSI path An AP level path correspondence management unit that combines transport path identification information (S-TR) that can uniquely identify a transport path between the transport layer and the session layer based on the identification information (SO 2) and stores the combined information in the storage unit; At the time of data communication from the AP of the OSI-side communication device to the AP of the different-protocol-side communication device, the transport path processing intervenes and if the transfer data is AP-level user data, the transport path identification information (S-TR ), The identification information (S-1) of the different protocol path is extracted with reference to the combination stored in the storage unit, and Korupasu of identification information (S-1
And a user data extraction processing unit for requesting the different protocol interface unit to transmit the AP level user data to the AP of the different protocol communication device.

[0009]

Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes an OSI protocol and an OS.
A protocol conversion device for performing protocol conversion of a different protocol other than I, 2 a protocol conversion execution unit according to the present invention, 3 an OSI protocol processing execution unit, 4 a different protocol processing execution unit, and 5 an OSI protocol processing execution unit OS that controls the interface between applications
An I interface unit, 6 an AP level path correspondence management unit for managing the correspondence between an OSI protocol application path and a different protocol application path, 7 a different protocol interface unit for controlling an interface between the different protocol processing execution unit and the application, 8 is O
An AP-transport path correspondence information storage unit 9 having correspondence information between an SI transport path and a different protocol application path, intervenes in a reception interface between an OSI upper layer and a lower layer, extracts AP level user data, and extracts a different protocol. This is a user data extraction processing unit that makes a transmission request to the side.

FIG. 2 is a diagram showing a flow of processing of user binary data transfer between the OSI protocol and a different protocol in FIG.

FIG. 3 shows the relationship between the protocol converter 1 and the OSI side communication partner (T), the different protocol side communication partner (S), and each address (meaning point for identifying an AP unique to the network) and dynamically. FIG. 9 is a diagram illustrating a relationship between obtained path information (path identifiers).

In FIG. 3, the AP through the protocol conversion device
In the communication between the APs, each AP performs a process by regarding the other party as communicating using the same protocol as the AP. Hereinafter, for the sake of simplicity, when describing the direction of communication, the OSI side is described as T side and the different protocol side is described as S side. (For example, T: terminal, S: center) That is, the OSI-side AP (AP (T)) has a T-side address (ADDR).
It is assumed that an OSI path is generated between -O (T), (a) in the figure and the S-side address (ADDR-O (S), (b) in the figure) to perform communication. The AP on the different protocol side (AP (S)) has an S-side address (ADDR-I (S), (d) in the figure) and a T-side address (ADDR-I
(T), a path using a different protocol is generated between (c) in the figure and communication is to be performed. The protocol conversion device 1 via both the devices converts the other party's address (ADDR-O
(S), ADDR-I (T)) on its own side, and the corresponding information on the T and S addresses (corresponding information between ADDR-O (S) and ADDR-I (S), ADDR-I (Corresponding information between O (T) and ADDR-I (T)) is held in advance by means such as SG.

FIG. 4 is a diagram showing an example of an O in a protocol converter.
FIG. 9 is an explanatory diagram of an operation in a generation phase of an application path between SI and different protocols. Path identification information of the OSI side transport path (information uniquely identifying the transport path between the transport layer and the session layer of the OSI protocol processing execution unit) and different protocol side path identification information (different protocol processing execution unit) Is stored in the AP-transport path correspondence information storage unit 8. At the time of generating an AP path from the T side (the following "-" corresponds to "-" in the figure): The AP level path correspondence management unit 6 passes through the OSI interface unit 5 between ADDR-O (T) and ADDR-O (S), (A)-
The path generation response between the steps (b) and (b) is performed, and the path identification information (S-O, (e) in the figure) notified from the OSI protocol processing execution unit 3 when the generation is completed is held.

Further, through the different protocol interface unit 7, from ADDR-I (T) (corresponding to ADDR-O (T)) to ADDR-I (S) (corresponding to ADDR-O (S)), A different protocol path is generated from the point (c) to the point (d), and the path identification information (SI, (f) in the figure) notified from the different protocol processing execution unit upon completion of generation is associated with the previous SO. Hold.

Similarly, when the AP path is generated from the S side, the AP
The level path correspondence management unit 6 responds to the path generation between ADDR-I (T) and ADDR-I (S) through the different protocol interface unit 7, and the path identification information notified from the different protocol processing execution unit when the generation is completed. Hold (SI). Further OSI
ADDR-O (corresponding to ADDR-I (S)) to ADDR-O (corresponding to ADDR-O (T)) through the interface unit 5
An OSI protocol path is generated toward (T), and the path identification information (SO) notified from the OSI protocol processing execution unit at the time of completion of generation is associated with the previous SI and held.

Up to this point, the generation of the AP path for each of the OSI and the different protocol and the combination of the path identification information are performed.
When a logical AP path through (S) to AP (T) is generated, then: the AP-transport path correspondence information storage unit 8 stores
With the SI network management function or the local interface function of the OSI protocol processing execution unit 3, the OS
The transport path identification information (S-TR), which is the information uniquely identifying the transport path between the transport layer and the session layer, is queried from the identification information (SO) of the I application path, and the different protocol path It is stored together with the identification information (SI) as a combination of S-TR = SO = SI.

Next, the data transfer phase will be described with reference to FIG. The following-corresponds to-in the figure. : When receiving data from OSI, the TSDU reception notification from the transport layer (the fourth layer) is not directly notified to the session layer but is once notified to the user data extraction processing unit 9 ((g) in the figure).

The user data extraction processing unit 9 determines whether the received TSDU includes application user data. If it does not include the user data, the reception of the TSDU is notified to the session layer as in the conventional case.

When user data is included, only the user data portion is extracted, and S-TR = SO = SI held in the AP-transport path correspondence information storage unit 8 from the notified transport path identification information (g). The corresponding different-protocol-side application path identification information ((f) in the figure) is obtained from the combination information of.

On the other hand, the received TSD is sent to the session layer.
Check the type of the protocol data unit in the U or higher than the session layer, judge whether post-processing of the protocol operation is necessary, and discard the protocol data unit if it can be determined that the protocol operation is unnecessary. Notify the layer of receipt.

[0023]

As described above, in the protocol conversion apparatus of the present invention, in the reception processing from the OSI side, the extraction of user data and the transfer processing to a different protocol side are executed at the time of notification of reception from the transport layer. Therefore, there is an effect that the throughput of the user data communication can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is a diagram showing a flow of processing of user binary data transfer between an OSI protocol and a different protocol in FIG. 1;

FIG. 3 is a diagram showing a relationship between a protocol conversion apparatus 1 and a communication partner (T) on the OSI side, a communication partner (S) on a different protocol, and a relationship between each address and path information (path identifier) obtained dynamically. is there.

FIG. 4 is an operation explanatory diagram of a phase of generating an application path between an OSI and a different protocol in the protocol conversion device.

FIG. 5 is a diagram illustrating a configuration example of a conventional protocol conversion device.

FIG. 6 is a diagram illustrating the operation of a conventional protocol converter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Protocol conversion device 2 Protocol conversion execution part 3 OSI protocol processing execution part 4 Different protocol processing execution part 5 OSI interface part 6 AP level path correspondence management part 7 Different protocol interface part 8 AP-transport path correspondence information storage part 9 User data Extraction processing unit 31 Protocol conversion device 32 Upper layer protocol conversion function 33A Lower layer protocol conversion function 33B Lower layer protocol conversion function

Claims (2)

(57) [Claims] A protocol for converting a protocol between the OSI protocol and the different protocol between an OSI communication device that executes an OSI protocol and a different protocol communication device that executes a different protocol different from the OSI. In the conversion device, when a path is generated between an application (hereinafter, referred to as an AP) of the OSI communication device and an AP of the different protocol communication device, an application path generated between the application and the OSI communication device is used. Transformation is performed based on the identification information (SO 1) of a certain OSI path, the identification information (S-1) of a different protocol path which is an application path generated between the different-protocol communication device, and the identification information (SO 2) of the OSI path. Transport path identification that can uniquely identify the transport path between the port layer and the session layer The information (S-TR) is combined and stored in a storage unit. When data is transmitted from the AP of the OSI communication device to the AP of the different protocol communication device, the transfer data is user data during the transport layer processing. If so, the identification information (S-1) of the different protocol path is extracted from the transport path identification information (S-TR) with reference to the combination stored in the storage unit, and the identification information of the different protocol path (S-1) is extracted. A protocol conversion device for transmitting the user data to the AP of the different-protocol communication device according to S-1). 2. A protocol for performing protocol conversion between the OSI protocol and the different protocol between an OSI communication device that executes an OSI protocol and a different protocol communication device that executes a different protocol different from the OSI. An OSI protocol processing execution unit for performing the OSI protocol processing; a different protocol processing execution unit for performing the different protocol processing;
An OSI interface unit for controlling an interface with the I-protocol processing execution unit; a different-protocol interface unit for controlling an interface with the different-protocol processing execution unit; an application of the OSI-side communication device (hereinafter referred to as an AP); A of the communication device on the protocol side
When a path is generated between the OSI interface and the OSI interface unit and the OSI protocol processing execution unit,
OSI path identification information (SO), which is an application path generated with the SI-side communication device, and generated between the different-protocol-side communication device via the different-protocol interface unit and the different-protocol processing execution unit. Transport path identification information for uniquely identifying the transport path between the transport layer and the session layer from the identification information (S-1) of the different protocol path which is the application path obtained and the identification information (SO) of the OSI path. (ST
R) in combination with the AP level path correspondence management unit, which is stored in the storage unit, and during the data communication from the AP of the OSI communication device to the AP of the different protocol communication device, intervenes in the transport layer processing and transfers the data. Is the AP level user data, the identification information (S-1) of the different protocol path is extracted from the transport path identification information (S-TR) by referring to the combination stored in the storage unit, and A user data extraction processing unit for requesting the different protocol interface unit to transmit the AP level user data to the AP of the different protocol communication device based on protocol path identification information (S-1). Protocol conversion device.