JP2002314627A - Method for transmitting data - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform data transmission by recognizing the line conditions of a communication line of a connected computer network only with an on-line system without using a common protocol and thereby effectively utilizing resources of the communication line and a computer system. SOLUTION: A timer 107 included in the computer system measures the transmission time of data transmission. The measured time is stored in a memory (buffer management table 103) included in the computer system and utilized as a transmission interval for data transmission. Since the measured transmission time changes every moment due to the line use situation of the computer network, the measured transmission time is updated so that the latest situation can be always utilized, and referred to each time data are transmitted to control variably the interval time of data transmission.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transmission method in an online system, and more particularly to a method of transmitting data in an online system connected to a computer network in which the performance changes moment by moment and a constant communication line performance cannot be maintained. The present invention relates to a data transmission method capable of keeping data transmission performance constant.

[0002]

2. Description of the Related Art As a prior art relating to data transmission of an online system connected to a computer network whose communication performance changes, for example, Japanese Patent Laid-Open Publication No. 2000-920
A technique described in Japanese Patent Publication No. 29 is known. In this conventional technique, the transmission interval of a unique word inserted at the beginning of a plurality of HDLC frames having data to be transmitted is controlled in accordance with the quality of a communication line constituting a network that changes from time to time.

[0003]

The prior art described above is
As a method of transmitting data to be transmitted to another terminal via a communication line in response to a data transmission request from a terminal,
It is assumed that a common protocol such as the HDLC protocol is used, and no consideration is given to transmission of data via a computer network that does not use the common protocol. For this reason, the above-described related art has a problem that data transmission via a computer network that does not use a common protocol cannot be controlled according to the quality of communication lines constituting the network.

An object of the present invention is to solve the above-mentioned problems of the prior art, and to know the line status of a communication line of a computer network connected only by an online system without using a common protocol, and In response to the,
It is an object of the present invention to provide a data transmission method in an online system, which enables to freely control an interval time (data transmission timing) for transmitting data from a transmission queue to a computer network during data transmission.

[0005]

According to the present invention, there is provided a data transmission method in a system for transmitting and receiving data between online systems using a computer network. By measuring and using this time to determine and use the interval time for transmitting the next data to be transmitted stored in the transmission queue to the computer network,
Further, the present invention is achieved by setting the interval time for transmitting the next data to be transmitted to the computer network to be an interval time that is not shorter than the time spent for transmitting the measured data immediately before.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a data transmission method in an online system according to the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a block diagram showing an example of the configuration of an online system to which the present invention is applied, and FIG. 2 is a diagram for explaining an example of the configuration of a buffer management table and buffers managed by the buffer management table. 1 and 2, 10
1 is an online system, 102 is a data accumulation processing unit,
103 is a buffer management table, 104 is a buffer, 1
05 is a buffer determination processing unit, 106 is a data transmission processing unit, 107 is a data transmission monitoring timer, 108 is a transmission queue control processing unit, 109 is a transmission queue, 110 is a terminal, 1
11 is a computer network.

As shown in FIG. 1, an online system 101 is built in a computer system and stores data to be transmitted for communication.
2. Buffer management table 103 for managing buffer 104 for storing data, buffer management table 1
03, which is managed by the buffer 03 and stores transmission data.
Buffer determination processing unit 10 that determines a buffer to be used
5. A data transmission processing unit 106 for transmitting the data stored in the buffer 104. The data transmission processing unit 106 has a transmission data timer 107 for transmitting data and monitoring the completion of the transmission, and a transmission queue timer for monitoring the transmission time of data from the transmission queue 109. A transmission queue control processing unit 108 for managing transmission of data to the computer network 111; a transmission queue 1 for managing transmission data in a queue
09. In the foregoing, the buffer 104
Can be secured in the online system 101. A terminal 110 that receives data communication is connected to the online system, and a computer network 111 to which another system to which data is to be transmitted is connected. Online system 10
1 has the above-described configuration, and realizes data communication with another online system via the computer network 111.

The buffer management table 103 includes a total number of buffers 21 for managing the number of buffers 104 held by the online system 101, a transmission time 22 for always managing the latest time from transmission of data to completion of transmission, and a buffer 104. And a buffer address 24 indicating the buffer location. The transmission buffer 104 is used for the online system 10.
In order to make it possible for a plurality to exist in one, the status flag 23 and the buffer address 24 are managed in an array as a set of information. In the above, the status flag 23 is
For example, if the buffer indicated by the buffer address is unused, it is set to "0", and if it is in use, it is set to "1". Is done. The buffer 104
Is a buffer length 26 for managing the size of the transmission buffer,
Unused buffer length 2 for managing the unused length of the transmission buffer
7, a transmission buffer 28 having a size indicated by the buffer length.

FIG. 3 is a flowchart for explaining a data transmission processing operation according to the embodiment of the present invention, which will be described below. In this flow, the online system 101 that has received data transmitted from the terminal 110 performs data communication via the computer network 111.

(1) It is checked whether or not there is a transmission request from the terminal 110. If there is no transmission request, the process is terminated without doing anything (step 30).

(2) If there is a transmission request in the check in step 30, it is determined which of a plurality of buffers in the online system is to be used. The details of this process will be described later with reference to FIG. 4 (step 31).

(3) After determining an available buffer in the process of step 31, the terminal 110 is added to the determined buffer.
(Step 32).

(4) The stored data is transmitted via the computer network, and the processing here ends.
The details of the data transmission process will be described later with reference to FIG. 5 (step 33).

FIG. 4 is a flow chart for explaining the processing operation for determining an available buffer among buffers in which a plurality of online systems exist in the above-mentioned step 31, which will be described below.

(1) To determine an available buffer among a plurality of existing buffers, in order to sequentially check whether or not the buffers managed in an array by the buffer management table 103 are available, a counter is first used. Initialize. As the counter, a register or the like of a computer system is used (step 40).

(2) In order to check all of the plurality of buffers, the total number of buffers is compared with the value of the counter. If the total number of buffers is smaller than the value of the counter, the process returns to step 40 (step 40). Step 41).

(3) It is checked whether or not the buffer indicated by the value of the counter can be used, based on whether or not the status flag is unused. The status flag manages two statuses, “0” indicating that the buffer is not in use and “1” indicating that the buffer is in use. In this processing, whether the buffer is unused is used. The determination is made based on whether the status flag is "0" (step 42).

(4) If it is determined in step 42 that the status flag is not unused, the value of the counter is incremented by +1.
Then, returning to the processing from step 41, the processing is repeated, and the state flag of the next buffer managed in the array is checked. By this processing, it is possible to prevent a plurality of transmission requests from being received simultaneously using the same buffer among a plurality of existing buffers (step 43).

(5) In the process of step 42, if a buffer having a status flag of "0" indicating unused is found, "1" indicating that the buffer is being used is set in the status flag, Exclusive control of the buffer management table.
Then, the buffer is determined as a buffer that can be specified (steps 44 and 45).

In the above-described processing, when the counter exceeds the total number of buffers, the processing from the initial setting of the processing counter in step 40 is performed again to check the use state of the buffer managed in the array. Indicates that a buffer in which the status flag is set to "1" cannot be used for another transmission request, but the status flag is set to "0" after the transmission is completed. This is to prevent a situation in which none of the buffers can be used permanently to enable the use.

FIG. 5 is a flowchart for explaining the process of transmitting the buffer-stored data from the transmission queue via the computer network in step 33 of FIG. 3, which will be described below.

(1) A buffer storing data to be transmitted is set in the transmission queue 108. Transmission of data to the computer network is performed via transmission queue 109 (step 50).

(2) The value of a monitoring timer for monitoring the elapsed time of transmission of data transmitted from the transmission queue is compared with the transmission time of the immediately preceding data transmission. In this process, the transmission time of the immediately preceding data transmission varies depending on the performance of the communication line at that time, but is the time at which the immediately preceding transmission data has been transmitted from the transmission queue, and the buffer management table 1
This is the transmission time 22 in 03. The value of the monitoring timer is the time during which the monitoring timer monitors the time during which the transmission data moved to the transmission queue in step 50 is held in the queue. Then, if the next data is transmitted sooner than the transmission time of the immediately preceding data, it is considered that the probability that the data transmitted on the computer network is delayed is high. Therefore, it is desirable to transmit the next data with a value (time) closer to the transmission time of the immediately preceding data (time) and a value (time) exceeding the value. The process here is
This is a process for determining a value (time) that is closer to the transmission time of the immediately preceding data (time) as described above (step 51).

(2) When the system has just been started, the monitoring timer starts counting from "0". Since the immediately preceding data transmission time is "0", the monitoring timer is compared in step 51. Is determined to be greater than the transmission time of the immediately preceding data, a transmission timer is started to measure the transmission time of the data transmission, and data transmission is started (steps 52 and 53).

(3) It is monitored whether or not all the transmission data in the transmission buffer has been transmitted, and if it is confirmed that all the transmission data in the transmission buffer has been transmitted, that is, if there is a notice of completion of data transmission. The transmission timer is stopped to know the transmission time of data transmission. The monitoring is continued while all the transmission data in the transmission buffer is not transmitted (steps 54 and 55).

(4) The transmission time of data transmission is set in the transmission time 22 of the buffer management table 103. The transmission buffer is the status flag 23 of the buffer management table 103.
Since the exclusion process has been performed, the status flag 23 is set to "0", exclusion release processing is performed, and the buffer can be reused (steps 56 and 57).

(5) Thereafter, the monitoring timer is initialized, and the monitoring timer is restarted for transmitting the next data (step 59).

The transmission of the next data is performed in step 5 described above.
In 1, the processing is started after it is determined that the value of the monitoring timer has become larger than the time required for transmitting the data transmitted this time.

According to the above-described embodiment of the present invention, data transmission from the data transmission to the computer network to the next data transmission is performed by utilizing the actual time of data communication using the actual communication line in the immediately preceding data transmission. The interval time can be variably changed and determined each time data transmission is performed, and the time for transmission of the next data can be determined. Resources of lines and computer systems can be used effectively.

[0031]

As described above, according to the present invention, the line status of a communication line of a computer network connected only by an online system without using a common protocol is known, and according to the line status, At the time of data transmission, the interval time (data transmission timing) for transmitting data from the transmission queue to the computer network can be freely controlled, and the resources of the communication line and the computer system can be used effectively.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration example of an online system to which the present invention is applied.

FIG. 2 is a diagram illustrating a configuration example of a buffer management table and a buffer managed by the buffer management table.

FIG. 3 is a flowchart illustrating a processing operation of data transmission according to the embodiment of the present invention.

FIG. 4 is a flowchart illustrating a processing operation of determining an available buffer among buffers in which a plurality of online systems exist in step 31 of FIG. 3;

FIG. 5 is a flowchart illustrating a process of transmitting data stored in a buffer from a transmission queue via a computer network in step 33 of FIG. 3;

[Explanation of symbols]

 Reference Signs List 101 Online system 102 Data accumulation processing unit 103 Buffer management table 104 Buffer 105 Buffer determination processing unit 106 Data transmission processing unit 107 Data transmission monitoring timer 108 Transmission queue control processing unit 109 Transmission queue 110 Terminal 111 Computer network

Continued on the front page F term (reference) 5B077 AA14 5K014 AA02 FA11 5K034 AA06 DD01 EE10 FF04 FF06 FF14 HH01 HH04 HH07 HH13 HH64 HH65 KK21 MM08 MM11 QQ01 QQ09

Claims (3)

[Claims] In a data transmission method in a system for exchanging data between online systems using a computer network, a time spent for immediately preceding data transmission is measured, and based on the time, a transmission queue is stored in a transmission queue. A data transmission method characterized by determining and using an interval time for transmitting stored next data to be transmitted to a computer network. 2. The time interval for transmitting the next data to be transmitted to the computer network is not shorter than the time spent for transmitting the immediately preceding data measured using a timer built in the computer system. 2. The data transmission method according to claim 1, wherein the time is an interval time. 3. The time spent for transmitting the measured immediately preceding data changes momentarily according to the line condition of the computer network, and the next data to be transmitted is transmitted to the computer network. 3. The data transmission method according to claim 1, wherein the interval time is dynamically changed in accordance with the time spent transmitting the data immediately before and after the momentarily changing data.