JPH0457544A - Transmission control system - Google Patents

Abstract

PURPOSE:To allow a data communication processing section to detect the end of data transmission by recognizing it that the data transmission is finished when an actual transmission time is a calculated transmission time or over, transmitting and receiving a succeeding data to a data transmission circuit section. CONSTITUTION:A data transmission request reception command means 11a sends a data to a destination via a data transmission circuit section 13 when the data is not sent on the occurrence of a data transmission request and a data transmission time arithmetic means 11b calculates a data transmission time Tc based on a transmission data length and a data transmission speed. Then a data transmission end monitor means 11c calculates an actual transmission time (t) to monitor whether or not the time reaches the data transmission time Tc or over and in the case of t>=Tc, it is taken that the data transmission is finished. Thus, even when no data transmission end notice comes from a data transmission circuit block 13, the data communication processing section 11 detects the end of data transmission internally.

Description

[Detailed description of the invention] [Table of contents] Overview Industrial field of application Prior art (Figure 5) Means for solving the problem to be solved by the invention (Figure 1) Effect (Figure 1) Implementation Example (a) Description of one embodiment (Figure 2) When not transmitting When transmitting (b) Other embodiments (Figures 3 and 4) Effects of the invention [Summary] Sending data to the destination Communication control unit (CCU)
Transmission of a data communication device comprising a data transmission circuit unit such as a line controller or a line control device, and a data communication processing unit such as a digital exchange that accepts data transmission requests and instructs the data transmission circuit unit to transmit predetermined data. Regarding the control method, even if there is no data transmission completion notification from the data transmission circuit,
To provide a transmission control method in which a data communication processing section can detect the completion of data transmission, and can also detect the completion of data transmission only by internal processing of the data communication processing section even if there is no data transmission completion notification from the data transmission circuit section. The data communication processing unit calculates the transmission time of the data based on the data length attached to the data to be transmitted, and when the actual transmission time exceeds the calculated transmission time, the data communication processing section The configuration is configured to recognize that the data has been completed and instruct the data transmission circuit unit to transmit the next data.

[Industrial Field of Application] The present invention relates to a transmission control system for a data communication device, and particularly to a communication control unit (CCU) that transmits data to a destination.
Transmission of a data communication device comprising a data transmission circuit unit such as a line controller or a line control device, and a data communication processing unit such as a digital exchange that accepts data transmission requests and instructs the data transmission circuit unit to transmit predetermined data. Regarding control method.

Storage-type digital switching equipment is equipped with a processing unit and a memory, and stores transmitted data such as input messages and packets in the memory, and also reads predetermined data from the memory as appropriate and sends it to the communication control unit (CCU) or line control device. The data is transmitted to the other party via a data transmitting circuit such as, and each time data transmission is completed, the next data is read from the memory and similarly transmitted via the data transmitting circuit. For this reason, in a data communication processing unit such as a digital exchange, it is necessary to detect by some method that data transmission has been completed for each data transmitted to a partner data communication device.

[Prior Art] Conventionally, a transmitting circuit unit is provided with means for identifying the completion of data transmission, and when the completion of data transmission is identified, a digital exchange or the like is notified of this fact.

FIG. 5 is a block diagram of a data communication device for explaining a conventional transmission control method, in which 1 is a data reception circuit section, 2
is a data communication processing unit that performs data communication processing according to a program; 3 is a memory that stores data requested to be transmitted; 4 is a data transmission circuit unit such as a line control unit; and 5 is a communication line, which is connected to the data communication processing unit 2. The memory 3 constitutes, for example, a digital exchange.

When a data transmission request is received from a terminal (not shown), the data reception circuit section 1 issues a data transmission request to the data communication processing section 2. If the data communication processing unit 2 is not transmitting data,
It immediately instructs the data transmission circuit section 4 to transmit data and sends the transmission data, causing the data transmission circuit section 4 to transmit the data to the other party via the communication line 5.

On the other hand, if data transmission is in progress when a data transmission request is made, the data communication processing section 2 stores the data requested to be transmitted in the memory 3. Thereafter, when the data transmission is completed and detected by the data transmission completion identification section 4a, the data transmission circuit section 4 notifies the data communication processing section 2 of data indicating the completion of data transmission via the interface 4b. As a result, the data communication processing unit 2 takes in the notification data and performs analysis processing to determine the source of the data, the content of the data, etc. When the completion of transmission is detected by the analysis process, it is checked whether transmission data exists in the memory 3, and if it exists, it instructs the data transmission circuit section 4 to transmit the data, reads the transmission data from the memory 3 and sends it, and communicates. Data is sent to the other party via line 5. Thereafter, similar operations are repeated and all data stored in the memory is transmitted to the other party.

[Problems to be Solved by the Invention] As described above, in the conventional method, the transmission circuit section detects the completion of data transmission and notifies the data communication processing section, and the data communication processing section analyzes the notification data and determines the source and This is to detect the completion of data transmission. Therefore, the data transmission completion notification processing and the data transmission completion detection processing place a load on the transmission circuit section and the data communication processing section, causing a reduction in the transfer capacity of the entire data communication device. In addition, the above communication line is 1
In this case, there is only one data transmission circuit, but if a data transmission circuit is provided for each of a plurality of communication lines, and data transmission completion is notified from each data transmission circuit, data transmission is completed. The time required for detection processing increases,
This further reduces the transfer ability of data communication equipment.

From the above, it is an object of the present invention to provide a transmission control system in which a data communication processing section can detect completion of data transmission even if there is no data transmission completion notification from the data transmission circuit section.

Another object of the present invention is to provide a transmission control method that can detect the completion of data transmission only by internal processing of the data communication processing section, even if there is no data transmission completion notification from the data transmission circuit section.

Still another object of the present invention is to provide a transmission control method suitable for use when data having different priorities are transferred in order of priority.

[Means to solve the problem] FIG. 1 is a diagram explaining the principle of the present invention.

11 is a data communication processing unit that performs data communication processing; 12 is a memory that stores transmission data; and 13 is a data transmission circuit unit. The data communication processing section 11 includes a data transmission request reception/instruction means 11a that instructs the data transmission circuit section 13 to transmit data in response to a data transmission request, and a data transmission request reception/instruction means 11a that instructs the data transmission circuit section 13 to transmit data based on the data length attached to the data to be transmitted. The data transmission time calculation means 11b calculates the time, the data transmission completion monitoring means 11c monitors whether the actual transmission time t is equal to or longer than the calculated data transmission time Tc, and the data transmission completion monitoring means 11c monitors whether a new data transmission request occurs during data transmission. At the time, the transmission queue creation means 11d creates a transmission queue based on the priority assigned to the transmission data.

[Operation] According to the present invention, when a data transmission request is generated, if data transmission is not in progress, the data transmission request is accepted and instructed.

The means 11a transmits data to the other party via the data transmission circuit section 13, and the data transmission time calculation means 11b
calculates the data transmission time Tc based on the transmission data length and data transmission speed, and the data transmission completion monitoring means 11c monitors whether the actual transmission time t exceeds the calculated data transmission time Tc, and if t≧Tc. It is assumed that the data transmission is completed when the data is sent. As a result, even if there is no data transmission completion notification from the data transmission circuit section 13, the data communication processing section 11 can internally detect the completion of data transmission, and there is no need to exchange data with the outside to detect the completion of data transmission. , the burden on the data transmission circuit section and data communication processing section can be reduced,
The transfer capacity of the entire data communication device can be increased.

Further, according to the present invention, when a data transmission request is generated and data transmission is in progress, the data transmission request reception/instruction means 11a stores the requested transmission data in the memory 12, and the transmission waiting queue creation means lid A transmission waiting queue QUE is created based on the priority assigned to the transmission data. When the data transmission is completed, the data transmission request reception/instruction means 11a reads the transmission data with the highest priority in the transmission waiting queue QUE from the memory 12, and instructs the data transmission circuit section 13 to transmit the data.

As a result, when a mixture of data having different transfer priorities is transferred to the other party's data communication device, the data can be reliably transmitted in the order of the highest priority.

[Embodiment] (a) Description of one embodiment FIG. 2 is a block diagram of one embodiment of the present invention, and the same parts as in FIG. 1 are given the same reference numerals.

In the figure, 11 is a data communication processing unit that performs data communication processing;
12 is a memory for storing transmission data; 13 is a data transmission circuit; 14 is a communication line; 15 is a data reception circuit;
6a, 16b, 16c... are data terminals.

The data communication processing unit 11 includes a data transmission request reception/instruction unit 11a that instructs the data transmission circuit unit 13 to transmit data in response to a transmission request, reads/writes transmission data into the memory 12, and a data transmission request reception/instruction unit 11a that instructs the data transmission circuit unit 13 to transmit data in response to a transmission request, and a data transmission request reception/instruction unit 11a that Data transmission time calculation means 11b that calculates the data transmission time based on the length and known data transmission speed, and data transmission completion monitoring means 11c that monitors whether the actual transmission time t is equal to or longer than the calculated data transmission time Tc. , has a transmission queue creation means lid which creates a transmission queue QUE based on the priority of the requested transmission data when a new data transmission request occurs during data transmission.

The overall operation of FIG. 2 will be described below, but the explanation will be made separately for cases in which data is not being transmitted and cases in which data is being transmitted when a data transmission request is issued.

When data is not being transmitted, when there is a data transmission request from the data terminals 16a, 16b, etc., the data receiving circuit section 15 sends the pig communication processing section 1
Send a data transmission request to 1.

When this data transmission request occurs, if data is not being transmitted,
The data transmission request reception/instruction means 11a instructs the data transmission circuit section 13 to transmit data, and also sends the input transmission data to transmit the data to the other party via the communication line 14.

In addition, in parallel with the above, the data transmission time calculation means 11b calculates the data length attached to the transmission data and the data transmission circuit section 1.
Based on the data transmission speed V (known) according to 3, the data transmission time Tc is calculated by the following formula % formula % (1), and the data transmission completion monitoring means 11C calculates the actual transmission time t after the start of data transmission.
It is monitored whether the time exceeds the calculated data transmission time Tc, and when t≧Tc, it is determined that the data transmission has been completed.

When the data transmission is completed, the data transmission request reception/instruction means 11a refers to a separately created transmission waiting queue QUE to check whether the data to be transmitted exists in the memory 12, and if it exists, the data transmission request reception/instruction means 11a determines whether the data to be transmitted exists in the memory 12 or not. Ask for sending data,
Remove the transmission data from the transmission queue. Then,
The data transmission request reception/instruction means 11a instructs the data transmission circuit unit 13 to transmit data, reads the transmission data with the highest transmission priority from the memory 12, transmits it, and transmits it to the other party via the communication line 14. .

Further, the data transmission time calculation means 11b calculates the data transmission time Tc based on the transmission data length in the same manner as described above, and the data transmission completion monitoring means 11c monitors the completion of data transmission based on the data transmission time. Similar operations are performed until all data stored in memory is transmitted.

To the place of data transmission The above is a case where data transmission is not in progress when a data transmission request is issued, but if data transmission is in progress, the data transmission request reception/instruction means 11a stores the requested data in the memory 12. do. Further, the transmission waiting queue creation means 11d extracts the priority P attached to the transmission data, connects the requested transmission data to the end of the waiting queue with the priority P, and updates the transmission waiting queue QUE. . Note that the transmission queue QUE has a priority of 1. ．． The data having the highest transmission priority is the one stored in the memory 12 first among the transmission data having the highest priority.

When data transmission is completed in such a state, as described above, the data transmission request reception/instruction means 11a refers to the transmission waiting queue QUE, reads the transmission data with the highest transmission priority from the memory 12, and sends it to the transmission circuit section 13. sending,
Further, the data transmission completion monitoring means 11c monitors the completion of data transmission based on the data transmission time Tc calculated by the data transmission time calculation means 11b, and performs the same operation thereafter.

(b) Other Embodiments The above embodiment is a case in which the data communication processing unit 11 is configured by dividing it into blocks for each function, but it can also be configured to be configured as a computer and perform data communication processing by a program. .

Figure 3 is a diagram of the data communication device in such a case.
The same parts as in FIG. 2 are given the same reference numerals. Reference numeral 11 denotes a data communication processing section having a computer configuration that performs transmission control processing according to the flowchart shown in FIG.
1. A data memory section 11-2 for storing data transmission time Tc, a transmission waiting queue QUE, etc., a program memory section 11-3 for storing communication control programs, etc. are provided.

12 is a memory for storing transmission data; 13 is a data transmission circuit; 14 is a communication line; 15 is a data reception circuit;
6a, 16b, . . . are data terminals.

The transmission control process will be explained below according to the flowchart in FIG.

When a data transmission request is received from the data terminals 16a, 16b, . . . , the data reception circuit section 15 issues a data transmission request to the data communication processing section 11.

When there is a data transmission request, the data communication processing unit 11 checks whether data is currently being transmitted (step 101), and if data is not being transmitted, it instructs the data transmission circuit unit 13 to transmit data.

The requested transmission data is sent to a predetermined destination via the communication line 14 (steps 1-2).

Further, the data communication processing unit 11 calculates the data transmission time Tc by equation (1) using the data length attached to the transmission data and the data transmission speed (known) (step 103).
, it is monitored whether the actual transmission time t after the start of data transmission is equal to or longer than the calculated data transmission time Tc (step 104).

If the actual transmission time t is less than or equal to Tc, check whether a new data transmission request has occurred (step 105); if not, continue time monitoring; if it has occurred, return to step 101 for subsequent processing. Execute.

Data transmission continues and in step 104 t≧Tc
When the time is up (time up), the data communication processing unit 11 determines that the data transmission has been completed, refers to the transmission waiting queue QTJE that is separately created and stored in the data memory 11-2, and stores the transmission data in the memory 12. It is determined whether it has been performed (step 106). If the transmission data does not exist in the memory 12, the process ends, and after that, the process from step 101 onward is performed after waiting for a new data transmission request.

However, if there is transmission data in the memory 12, the transmission data with the highest transmission priority is determined by referring to the transmission waiting queue QUE (step 107), and the transmission data is removed from the transmission waiting queue (step 108).

Thereafter, the process jumps to step 102, instructs the data transmission circuit unit 13 to transmit data, reads the transmission data with the highest transmission priority from the memory 12, and transmits the data to the transmission circuit unit 1.
3, transmit it to the other party via the communication line 14, and repeat the subsequent processing.

On the other hand, if data transmission is in progress when a data transmission request occurs,
rYESJ in step 101, the data communication processing unit 11 extracts the priority P attached to the transmission data (step 109), and connects the requested transmission data to the end of the waiting queue with the priority P. The transmission waiting queue QUE is updated (step 110), and the process jumps to step 104.

Then, in step 104, if t≧Tc and the data transmission is completed, as described above, the transmission waiting queue QU
E, it is determined whether the transmission data is stored in the memory 12, and if there is transmission data in the memory 12, the transmission data with the highest transmission priority is determined, and the transmission data is removed from the transmission waiting queue; The transmission data with the highest transmission priority is read from the memory 12 and sent to the transmission circuit section 1.
Send to 3.

In the above description, the data receiving circuit section and the data transmitting circuit section are configured separately, but they can also be configured integrally.

Moreover, although the above example is a case where data with different priorities are mixed and transmitted on one communication line 14, it is possible to provide a plurality of communication lines and transmit data with different priorities on each communication line. It can also be configured.

Although the present invention has been described above with reference to examples, the present invention can be modified in various ways according to the spirit described in the claims, and the present invention does not exclude these modifications.

[Effects of the Invention] According to the present invention, the transmission time of data to be transmitted is calculated based on the data length attached to the data, and when the actual transmission time exceeds the calculated transmission time, the data is transmitted. Since the configuration is configured to recognize that transmission has been completed and instruct the transmission of the next data, the data communication processing section can internally detect the completion of data transmission even if there is no data transmission completion notification from the data transmission circuit section. This eliminates the need for exchanging data with the outside, reduces the burden on the data transmission circuit section and the data communication processing section, and increases the transfer capacity of the entire data communication device.

Further, according to the present invention, when a new data transmission request occurs during data transmission, a transmission waiting queue is created based on the priority assigned to the transmission data, and when the data transmission is completed, the most recent data transmission request is created from the transmission waiting queue. Since the configuration is configured to seek transmission data with a high priority and instruct the data transmission circuit to transmit that data, when a mixture of data with different transmission priorities is transferred to the other party's data communication device, priority can be ensured. Data can be sent in descending order of degree.

[Brief explanation of the drawing]

Fig. 1 is a diagram explaining the principle of the present invention, Fig. 2 is a block diagram of one embodiment of the present invention, Fig. 3 is a block diagram of another embodiment of the present invention, and Fig. 4 is the data communication processing section of Fig. 3. FIG. 5 is a block diagram of a data communication device for explaining a conventional transmission control method. 1 ・ ・ 1a 1b 1c id 12 ・ 13 ・Data communication processing unit...data transmission request reception/instruction means...data transmission time calculation means...data transmission completion monitoring means...transmission queue creation means/memory/data transmission Circuit section 14 ・・Outside the communication line>, person - Configuration diagram of another embodiment of the present invention FIG. 3 Flowchart of transmission control processing FIG. 4

Claims (2)

[Claims] (1) Data transmission circuit unit (1) that transmits data to the other party
3), and a data communication processing unit (11) that instructs the data transmission circuit unit to transmit the data in response to a data transmission request, the data communication processing unit (11) Calculate the transmission time of the data based on the data length attached to the data,
A transmission control system characterized in that when the actual transmission time exceeds the calculated transmission time, it is recognized that the data transmission is completed and the data transmission circuit unit (13) is instructed to transmit the next data. (2) When a new data transmission request occurs during data transmission, the data communication processing unit (11) creates a transmission waiting queue based on the priority assigned to the transmission data, and transmits the data upon completion of data transmission. 2. The transmission control system according to claim 1, wherein the transmission data having the highest priority is obtained from the waiting queue and the data transmission circuit section (13) is instructed to transmit the data.