JPH0458219B2 - - Google Patents

Description

[Detailed Description of the Invention] [Summary] A path table representing the hierarchical order of a plurality of protocol processing units with each protocol layer as a unit is provided, and when a protocol processing unit that has completed processing issues a request instruction,
It connects to the lower layer protocol processing unit specified in the path table, and connects to the upper layer protocol processing unit when a response is instructed, providing a method for specifying the destination of requests and responses using the path table.

[Industrial application field]

The present invention relates to a communication control system, and particularly to an improvement in a connection control system between layered protocol processing units.

In recent years, with the diversification and complexity of data communications, a method has been adopted in which communication functions are hierarchically modularized and protocols (communication rules) are established for each corresponding hierarchical module to perform communication between devices.

Various network methods that have become popular in recent years are:
The above protocols were uniquely defined to systematize devices, but because they have different hierarchical structures, communication cannot be performed between different networks, so standardization is being promoted.

For this reason, each device prepares a protocol processing unit (processing program) for each hierarchical module, and combines these to deal with the network system to which it is connected, such as the network system to which it belongs, the standard network system, etc. .

However, in the past, connections between protocol processing units were specified by each protocol processing unit, so even if the same protocol processing unit can be used with different network systems, the connection destination must be changed if the upper and lower layers are different. First, there was a problem that it could not be shared.

Therefore, there is a need for a simple communication control system that can share a protocol processing section.

[Conventional technology]

FIG. 4 is an explanatory diagram of a conventional communication control system.

In Figure 4, a diagram showing an example of module configuration,
1 is an application program that requests transmission or reception;
Reference numeral 2 denotes a communication control unit, which includes a module A and a module B.

Here, the protocol processing units (processing programs) corresponding to the above-mentioned hierarchical modules are referred to as modules A and B, and module A is the upper layer,
Module B forms the lower layer, and its processing targets correspond to data A and header B, respectively, on the transmitting/receiving frame 50 (FIG. 4 1), and data A (upper layer) corresponds to header B. (lower layer) and is configured to be processed.

The above module is actually composed of multiple layers such as a session layer to a data link layer, and in the case of transmission, when a transmission request is output from the application program 1, conversion to a predetermined data format in each layer, Transmission/reception flow control, etc. are performed sequentially from the upper layer to the lower layer, and data is transmitted to the destination via the line.

The connection between modules in the above protocol processing will be explained based on the two sets of modules A and B shown in FIG. Requests and responses are exchanged between modules that are in contact with each other in the hierarchy. is performed and protocol processing in each module is performed,
Request/response destinations are specified within each module.

Therefore, if this module A is used in another network system and module D is used instead of module B in the lower layer [Figure 4] Diagram showing an example of correspondence to other NAs], the request module A' with the destination changed to module D must be used.

Therefore, in a communication control unit that supports two different sets of network systems, module A, module B, module A', module D, and is prepared in the communication control section 4.

[Problem that the invention seeks to solve]

As mentioned above, in a communication control unit that uses hierarchical modules, the destination is specified by each module, so there is a problem that modules cannot be shared between different systems.

SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide a simple communication control system that allows modules to be shared.

[Means for solving problems]

For the above purpose, the communication control system of the present invention, as shown in FIG.
A path table 8 representing the hierarchical order of B and C, and a request instruction 12 output by the protocol processing unit B.
a and the response instruction 12b and refer to the path table 8, and when the request instruction 12a is received, the protocol processing section C of the adjacent lower layer is sent, and when the response instruction 12b is sent, the protocol processing section A of the adjacent upper layer is sent. and a path table control section 13 that performs connection control, respectively.

[Effect]

Protocol processing units (hereinafter referred to as modules) A, B,
When C outputs the request instruction 12a and response instruction 12b together with the processing data to the path table control unit 13, the path table control unit 13 refers to the path table 8, and in the case of the request instruction 12a, the next instruction in the path table 8 is output. When the response instruction 12b is the module (lower layer), the previous module (upper layer) is selected and instructed.

By passing processing data to the specified module and starting it, it is possible to connect the module to the specified destination, eliminating the need for destinations previously entered in the module, and changing the path table 8 or connecting multiple destinations. By providing this, the module can be shared between different network systems.

〔Example〕

Embodiments of the present invention will be described with reference to FIGS. 1 to 3.

Fig. 2 is a block diagram of the communication control section of the embodiment;
The figure is an operation flowchart.

This embodiment shows a communication control section corresponding to two network systems (NA1, NA2), and also includes a path table control section 13 that selects and instructs the path table control section 13 shown in FIG.
The functions are divided into a main controller 10 and a main controller 10 that starts specified modules.

In FIG. 2, this communication control section includes main control section 1.
0, queue table 11, path table control unit 1
3. It is composed of a path table 8 and modules A to D that perform protocol processing corresponding to each hierarchical module. Here, the path table 8 is a table in which module names are arranged in hierarchical order corresponding to the type of network system (NA type), and the queue table 11 is a table in which module names are arranged in hierarchical order according to the type of network system (NA type).
3a is a table provided for the main control unit 10 to select a module to be started next from the module instructed by the module 3a based on the priority order. The path table control section 13a is composed of a program shared by each module.
Request instructions 12 sent from each module A to D
a. Refer to the path table 8 based on the response instruction 12b and transfer the selected module to the queue table 11.
In response to a transmission or reception request from the application program 6, the main control unit 10 selects the first module (module A in this case) and requests processing, and also returns from each module. When this happens, the modules A to D start the next module by referring to the queue table 11.Modules A to D execute predetermined processing by starting the main control unit 10, and instruct the request/response along with the processing data to complete the pass. This consists of a subprogram that requests processing to the table control section 13a and returns to the main control section 10 after the processing is completed. Furthermore, the data 9 is composed of transmission data 9a and NA type 9b prepared by the application program 6 at the time of transmission, and the main control unit 10 creates data 12 based on this transmission data 9a and requests processing to each module. The data 12 includes processing data 12d in each module as well as request instructions 12a,
Entries are provided for a response instruction 12b, NA type 9a, and request source module 12c.

Note that NA1 performs protocol processing from modules A, B, and C, and NA2 performs protocol processing from modules A and D.
It is assumed that the information is processed by

The operation at the time of transmission will be explained below with reference to FIG.

(1) The application program 6 prepares the transmission data 9a, specifies the NA type 9b (for example, NA1), and requests transmission. (2) In the communication control section, the main control section 10 sends the data for processing of each module A to C. 12 and requests processing to the first module (module A).The operation of module B will be explained below with a focus on module B.

(3) The requested module B executes a predetermined process, writes the request source module name (Mo name) 12c, request instruction 12a or response instruction 12b together with the processing data 12d, and sends it to the path table control unit 13a. Request processing.

(4) The path table control unit 13a determines the NA type (NA1), request source module name, and request/response from the received data, and also refers to the path table 8, and in the case of request instruction 12a, determines the NA type (NA1), request source module name, and request/response. C, and when the response instruction 12b is selected, the upper layer module A is selected, and the module instruction data (for example, module pointer, flag, etc.) 11a is entered corresponding to the corresponding module on the queue table 11, and the request is made. Return to original module B.

(5) Module B returned from the path table control section 13b returns to the main control section 10.

(6) The main control unit 10 refers to the queue table 11, selects a module with a high priority among the modules in which the module instruction data 11a has been entered, passes the data 12 to it, and activates it.

Note that when NA2 is specified, module A and module D are respectively selected by the above operation.

As described above, since the path table control unit 13a manages and controls the connection of each module, there is no need to specify the destination of requests and responses in each module, and different network systems can be handled by simply changing the path table 8. be able to.

Although the present invention focuses on modules corresponding to protocol layers, it can be similarly applied to programs that perform field processing within each protocol layer, for example.

〔Effect of the invention〕

Since the present invention provides a communication control method that controls connections between modules using a path table, there is no need to write a destination on each module, and the advantage is that modules can be shared between different network methods. It is extremely large.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the principle of the present invention, Fig. 2 is a block diagram of a communication control section of an embodiment, Fig. 3 is an operation flowchart, and Fig. 4 is a diagram illustrating a module configuration in a conventional communication control method explanatory diagram. , is a diagram showing an example of correspondence to other NAs, and is a diagram showing an example of correspondence to two sets of NAs. In the figure, 1 and 6 are application programs, 2 is a communication control unit, and 8
is a path table, 9 is data, 9a is transmission data, 9b is an NA type, 10 is a main control unit, 11 is a queue table, 11a is module instruction data,
12 is data, 12a is a request instruction, 12b is a response instruction, 12c is a request source module name, 12d is processing data, 13 and 13a are path table control units,
It is.

Claims (1)

[Claims] 1. A plurality of protocol processing units A, B, and C corresponding to hierarchical protocol layers, and
In a communication control method that connects the protocol processing units and performs a predetermined communication process based on the request instruction and response instruction output by each of the protocol processing units, this represents the hierarchical order of the protocol processing units A, B, and C. Path table 8 and request instruction 12 output by the protocol processing unit B
a and the response instruction 12b are received, and the path table 8 is referred to. When the request instruction 12a is received, the protocol processing section C in the adjacent lower layer is sent, and when the response instruction 12b is received, the protocol processing section A on the adjacent upper layer is sent. and a path table control unit 13 for controlling connection, respectively, to determine and connect the protocol processing unit to be processed next based on the request instruction, the response instruction, and the path table output by the protocol processing unit. A communication control method characterized by: