JPS61288538A - Dynamic protocol load system - Google Patents

Abstract

PURPOSE:To load dynamically a communication protocol even when a real memory for communication is small in capacity and to attain communication by using an identification means so as to identify a high-order protocol used by an opposite terminal device, storing the high-order protocol from an external storage device into the memory and applying processing based on it. CONSTITUTION:When an incoming call exists from a terminal device via a public network, a communication control section 12 receives it, an identification section 20 of a processing section decodes a protocol ID signal described in the incoming signal to discriminate that the high-order protocol in use is B.A processing section 13 reads the protocol B from an external storage device 18 to an external storage control section 17 to give a command to be sent to a memory control section 15, the external storage control section 17 reads the high-order protocol B from the external storage device 18 to send it to a memory control section 15, which loads the high-order protocol B to a prescribed location of the memory 14, the processing section 13 returns an incoming reception signal to an opposite terminal device according to the said incoming call. Thus, it is possible to attain data communication by the high-order protocol B.

Description

[Detailed Description of the Invention] [Table of Contents] Overview Industrial Field of Application Conventional Technology Problems to be Solved by the Invention Means for Solving the Problems (Fig. 1) Working Examples (1) Examples of Examples Configuration (Fig. 2) (2) Operation of the embodiment (Fig. 3) Effects of the invention [Summary] The present invention provides link-level and packet-level communication in the communication channel of a terminal device in data communication via a public network. The lower level protocols are resident and the higher level protocols such as application level protocols and the like that control two functions are dynamically loaded and communicated when a call is received from the other party's terminal.

[Industrial application field]

The present invention relates to a dynamic protocol loading method.

In particular, when connecting data processing devices via a public network, the present invention relates to a device that can support multiple types of communication protocols depending on the partner terminal without making the upper level protocol resident in memory.

[Conventional technology]

As shown in FIG. 4, a case where terminal device I and terminal device I are connected via a public network to perform data communication.

Physically connect the terminal device I and the public network exchange.

Physically connect the terminal device■ and the exchange. When performing data communication between terminal device ■ and terminal device I,
The terminal devices (2) and (1) will be connected to this exchange. Terminal device I like this.

A link-level protocol is required to connect the terminal device I and the exchange, and a packet-level protocol is required to call the other party when connecting the terminal devices I and I via the exchange.

Depending on what kind of application program is used to operate this terminal device, a protocol at the application program level is required.

By the way, so-called lower-level protocols such as the link-level protocols and packet-level protocols have been standardized by CCITT, but standardization of higher-level protocols such as application program level protocols is currently not progressing. Manufacturer (
User) Each company has its own unique protocol. This higher level protocol defines the format of the data.

[Problem to be solved by the invention] Conventionally, a terminal device communicates 9, for example, upper protocols A, B, etc., which is essential data for data communication.
The communication channel portion of the terminal device becomes available memory when controlled by either C.

These upper protocols A, B, and C were resident. Therefore, these higher-level communication protocols are fixedly placed in the real memory for communication, which poses a problem in terms of efficiency.

The purpose of the present invention is to solve these problems by developing a dynamic protocol that allows communication with the other party using the same protocol without having these multiple upper-level protocols resident in the memory of the terminal device. The purpose is to provide a loading method.

[Means for solving problems]

In order to achieve the above object, in the dynamic protocol loading method of the present invention, as shown in FIG. 1, lower protocols such as link level and packet level are made to reside in the main memory of the terminal device.

The upper level protocols (A, B...N) are stored in an external storage device such as a direct access storage device (DASD),
When there is an incoming call from the other party's terminal device 9, for example, the terminal device I, a protocol identification signal for identifying the protocol to be used is written in the incoming call signal.

[For production]

Terminal I decodes the protocol identification signal written in the incoming call signal, reads the corresponding upper protocol from the direct access storage device (DASD), stores it in memory, and calls the other terminal based on this. It is possible to perform data communication with device ■.

〔Example〕

An embodiment of the present invention will be described based on FIGS. 2 and 3.

FIG. 2 is a configuration diagram of an embodiment of the present invention, and FIG. 3 is an explanatory diagram of its operation.

(1) Configuration of the embodiment In FIG. 2, 10 indicates a terminal device, 11 an application program operated on the terminal device 10, 12 a communication control section, 13 a processing section, 14 a memory, and 15 a memory. A control section 16 is a protocol identification code output section, 17 is an external storage control section, 18 is an external storage device, and 20 is an identification section.

The communication control unit 12 connects the terminal device 10 and the public network NT, and is used to send data to other terminal devices, etc. via the public network NT, and to receive data sent from other terminal devices, etc. It's a good thing to do.

It has a modem etc.

The processing unit 13 performs various processing controls in the terminal device 10. For example, when calling a partner terminal device, it adds identification data of the upper protocol, or decodes an incoming call from another terminal device and processes it. It identifies the upper layer protocol to be used. An identification section 20 is provided for this identification.

The memory 14 stores lower-level protocols at the link level and packet level, as well as upper-level protocols used when communicating data with other terminal devices.

The memory control unit 15 performs control to read and write data to the memory 14. For example, the memory control unit 15 stores upper protocols used for data communication, and reads necessary protocols stored in this memory. It is something to put out.

The protocol identification code output unit 16 outputs a protocol identification code for informing the terminal device of the higher level protocol used when calling the other terminal device.

The external storage control unit 17 controls access to the external storage device 18, and reads out, for example, higher-level protocols necessary for data communication.

The external storage device 18 stores a plurality of upper protocols A, B, . . . , N used in this network.

Note that when calling the other party from one's own terminal device, one of a plurality of upper level protocols is basically selected for each logical access unit. The protocol to which this upper layer protocol belongs is determined in advance for each logical access unit when the system is created.

(2) Operation of the embodiment Next, the operation of the embodiment will be explained based on FIG. 3 with reference to other countries.

■ When a call is received from the terminal device I via the public network, the communication control unit 2 receives the call.

The identification unit 20 of the processing unit decodes the protocol ID signal written in the incoming call signal and determines that the upper protocol used is B.

(2) The processing section 13 then instructs the external storage control section 17 to read protocol B from the external storage device 18 and send it to the memory control section 15. Based on this, the external storage control unit 17 reads the upper protocol B from the external storage device 18 and sends it to the memory control unit 15. At this time, the memory control unit 15 has received an instruction from the processing unit 13 to load the upper protocol B into the upper protocol storage location of the memory 14. Load into place.

■ The processing unit 13 uses the memory 14 of the upper protocol B.
Then, in response to the incoming call (2), an incoming call acceptance signal is sent back to the other party's terminal device (2).

This makes it possible to perform data communication using the upper protocol B, and subsequent data communication will be performed.

Note that even if a call is received from another terminal device using another upper protocol, such as upper protocol M, a similar response is made, and data communication using upper protocol MK is performed this time.

By the way, when the terminal device 10 in FIG. 2 performs data communication using the upper protocol A, the processing section 13 reads out the upper protocol information (from the external storage device 18) to the external storage control section 17, and stores it in the memory control section. 15, it is loaded into the memory 14. After this loading is completed, the protocol identification code output section 16 sends the upper protocol name to the processing section 13 as a protocol ID signal. The processing unit 13 adds a protocol ID signal indicating this upper protocol A to create an incoming call signal, and transmits the signal from the communication control unit 12 to the public network NT.
The data is sent to the other party's terminal device 9, for example, the terminal device l. As a result, the same control as described in (1) to (2) above is performed in the terminal device I, and data communication by the upper protocol person is performed this time.

〔Effect of the invention〕

According to the present invention, the lower protocol resides in the memory of the terminal device connected to the computer network, and the upper protocol used during actual data communication is loaded. Even if the real memory for communication has a small capacity, it becomes possible to dynamically load communication protocols and perform communication.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the principle of the present invention. FIG. 2 is a configuration diagram of an embodiment of the present invention. FIG. 3 is an explanatory diagram of the operation of the embodiment. FIG. 4 shows a conventional example. In the figure, 10...terminal device. 11...Application program. 12...Communication control unit. 13... Processing section. 14...Memory. 15...Memory control unit. 16...Protocol identification code output section. 17...External storage control unit. 18...External storage device.

Claims (1)

[Claims] In a terminal device connected to a computer network and capable of operating on multiple upper-level protocols, an external storage device (where multiple upper-level protocols are stored)
18), a memory (14) in which an upper level protocol necessary for data communication is stored, and an identification means (20) for identifying the upper level protocol used by the other party's terminal device; A dynamic protocol loading method, characterized in that the upper protocol is identified by an identifying means, stored in the memory from the external storage device, and processing is performed based on this.