JPH08161244A - Data transmission method - Google Patents

Abstract

PURPOSE: To transmit data with improved transmission efficiency while maintaining priority to a certain degree by delaying the data, rearranging them in the order of the priority, turning them to blocks and transmitting them. CONSTITUTION: The data are received and the data are analyzed by a data analysis part m20. Then, in a data kind judgement processing S31, a data base part m60 is retrieved based on the received data so as to judge a data kind. Then, in a priority decision processing S32, the data base part m60 is retrieved based on the data so as to decide the priority. Also, in a delay processing S34, whether or not activation is commanded from a timer monitoring part is judged. Further, in a rearrangement processing S35, the priority present in the column of the priority is compared and the data are rearranged in the descending order of the priority. The data rearranged in such a manner are turned to the blocks by a blocking processing S36. Then, the stored data are transmitted to a computer connected to an input/output device in a frame form by a transmission part m40.

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, and in particular, in the case of performing data communication between a plurality of computers, the data can be transmitted according to the priority of the data and the transmission efficiency is good. The present invention relates to a data transmission method.

[0002]

2. Description of the Related Art In the construction of a computer system, the conventional
A so-called function distribution system in which the processing performed by one computer is processed by a plurality of computers has become common. For example, a system may be configured by a computer 1 that monitors information from the outside and a computer 2 that performs display processing.

With such a system configuration, the conventional system 1
Since the processing performed by one computer can be distributed by the computers 1 and 2, there is an advantage that the processing load of each computer can be reduced and the throughput of the entire system can be increased.

Since high speed is required for data transmission between the computers 1 and 2, performance is secured by dense connection of a shared memory or a dedicated high speed communication line. Further, in recent years, the openness has made common the calculation functions such as OS and communication, and it is increasing the number of cases in which a system that can be easily connected to various computers is connected to each other by data communication.

On the other hand, in order to perform data transmission from the computer 1 to the computer 2, a technique is generally used in which data collected and edited by the computer 1 is converted into a communication unit called a frame and information is transmitted to the computer 2 by communication. Target.

An example of a method of transmitting such data will be described below with reference to FIGS. 15 and 16. FIG.
FIG. 5 is a block diagram showing a functional configuration of a computer that performs data transmission according to a conventional technique. FIG. 16 is a timing chart showing the transmission timing of data transmission according to the conventional technique.

The portion of the computer 1 that performs data communication is
Reception processing unit 100, data analysis unit 200, transmission unit 300
It is composed of Each of these functions is
It plays the roles of data analysis and data transmission.

Now, as shown in FIG. 16, data 1
Is transmitted to the computer 1 at the timing of t1. Then, the reception process 100 performs the reception process, and the data analysis unit 200 analyzes this data. By
The data is received and analyzed. The analyzed data is transmitted by the transmission unit 300 to the computer 2 at the timing of t11 in the format shown in the transmission format of FIG.

[0009]

The above-mentioned conventional technique relates to a general technique for performing data communication between computers. However, in the above-mentioned conventional technique, there is a problem that the transmission efficiency is poor because the data is processed by the computer 1 and transmitted to another computer 2 every time data to be transmitted by the computer 1 is generated.

[0010] In particular, some of the monitoring data are small data of about several bytes, and there is a characteristic that they frequently occur in a short time. In the conventional method, communication of small data is performed. However, there is a problem in that communication efficiency is lowered and throughput is lowered. In the worst case, there is a problem that it may cause a processing delay of the data receiving computer due to a transmission neck, and even affect the display response.

Further, a first-in first-out system (First
In First Out (often abbreviated as "FIFO"), data is generally transmitted from the computer 1 to the computer 2. Therefore, there is no mechanism for preferentially transmitting urgent data. However, there is a problem in that the transmission of the message is delayed and the response to the message is delayed accordingly.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and an object thereof is to comply with the priority of data to some extent when data communication is performed between computers, and It is to provide a data transmission method with high transmission efficiency. In particular, it is to provide a data transmission method capable of responding to an emergency by preferentially transmitting emergency data.

[0013]

In order to achieve the above-mentioned object, the structure of the invention relating to the data transmission method of the present invention is a data transmission method for communicating between a plurality of data processing systems. The data to be transmitted has a priority for data transmission,
(1) a procedure of delaying and storing the data, (2) a procedure of rearranging the stored data in the order of the priority,
(3) There is a procedure for dividing the rearranged data into blocks, and the steps (1) to (3) are performed in this order to transmit the blocked data.

More specifically, in the above data transmission method, the transmission side data processing system includes a database for determining a priority for data transmission of data to be transmitted, and (0a) the priority of data to be transmitted. Degree
The procedure for searching and determining the database is performed before the procedure (1).

In the above data transmission method, another structure has an urgent flag indicating that the data to be transmitted is urgent, and when this urgent flag is set, this data is a normal data which is not urgent flag. To
The data is divided into blocks in advance, and this data is transmitted in advance of normal data.

More specifically, the data processing system on the transmitting side includes a database for determining the urgent flag of data to be transmitted, and (0b) searches the database for ON / OFF of the urgent flag of data to be transmitted. The procedure to be determined in this way is performed before the procedure in (1) above.

More specifically, in the above data transmission method, the transmission side data processing system includes a timer monitoring unit, and the command of the timer monitoring unit terminates the procedure of (2) to complete the next procedure. It was made to proceed to.

[0018]

According to the present invention, since data is transmitted in blocks, the overhead for data transmission is significantly reduced as compared with the case where data is sent one by one.

Although the data in another block is not limited to this, since the data is arranged in the order of priority within the block, the higher priority data is transmitted to other computers earlier. .

Further, since the emergency data is transmitted in an emergency prior to the normal processing, there is an effect that it can be applied to a system which needs to be dealt with in an emergency.

[0021]

Embodiments of the present invention will be described below with reference to FIGS. First, a system configuration that assumes data transmission by the data transmission method according to the present invention will be described with reference to FIG. Figure 9
FIG. 3 is a schematic diagram of a system configuration that is supposed to perform data transmission by the data transmission method according to the present invention.

As shown in FIG. 9, in this system, the computers 1, 2a to 2n are connected by a line 5 and can communicate with each other. Further, an input / output device such as a display 4a and a printer 4b and an auxiliary storage device such as a magnetic disk 4c are connected to each computer. In this embodiment, a maintenance system for power distribution equipment is assumed as the data transmission system. Therefore, a device to be controlled corresponds to the controlled object, and specifically, a transformer, a distribution line, or the like. Ratings and failure information of these devices are the data exchanged in this system.

Next, the data format used in the data transmission method of this embodiment will be described with reference to FIG. FIG. 11 is a schematic diagram of each data format used in the data transmission method.

The database format shown in FIG. 11 (b) is one in which the data handled in this embodiment are grouped together into one unit. This is characterized in that, in addition to the original data, an urgent flag, a data type, and a priority item are provided as a header part. The urgent flag is a flag for indicating that the content of this data is highly urgent and needs to be transmitted as soon as possible. The data type is an identifier for categorizing the contents of data, and the priority is a number indicating the priority for transmitting the contents of the data. According to this priority, the data transmission method of the present invention Defines the order of data transmission. Below, let's decide that the smaller the number, the higher the priority.

The specific contents of the data will be clarified below in the explanation of the transmission method.

The buffer format shown in FIG. 11A is the format when it is retrieved from the database and is the same as the database format. FIG.
1 (c) is a format transmitted between computers and is a compilation of several database formats.

Now, the procedure of the data transmission method according to the present invention and the contents of the data will be described with reference to FIGS. 1 to 8 and 11 to 14.

FIG. 1 is a block diagram schematically showing the function of each part of the data transmission system according to the present invention.
In particular, it is a diagram in which the processing flow is written in the transmission processing unit m30. 2 to 7 are detail charts showing the processing of the transmission processing unit m30 in more detail. FIG.
[Fig. 6] is a detail chart showing the processing of the timer monitoring unit m70. 12 and 13 show specific data handled by the power distribution maintenance system of this embodiment.

FIG. 14 shows concrete data stored in the database of this embodiment.

Now, from the standpoint that the urgency of data and the priority are related to each other, let's decide that the data of priority 1 is urgent data. Therefore, the value of the emergency flag of the data having the priority of 1 becomes 1.

The data handled by this power distribution maintenance system is
It is assumed that it is as shown in FIG. As can be seen from the contents of the data, the controlled object 3 is a transformer, a substation, a distribution line, a switch, or the like.

The following description will be made with reference to FIG. It is assumed that the controlled object 3 is, for example, a transformer and the received data is “transformer abnormality”. After the reception processing unit m10 receives this, the data analysis unit m20 analyzes the data.

First, the transmission processing unit m30 is entered, and in the data type determination process S31, the database unit m60 is searched based on the data received for the data type determination (FIG. 2).

FIG. 14 shows the specific contents of the database. Looking at this, the "transformer abnormality" of the transformer
Belongs to the transformer accident information DB2, it can be seen that the data type here is 2. Therefore, 2 is entered in the data type column of da1 in FIG. 12A corresponding to this data.

Next, in the priority determination processing S32, the database section m60 is searched based on the data for priority determination (FIG. 3).

According to the flow chart shown in FIG. 3,
The data and DB2 in FIG. 14 are associated with each other, and it is determined that the priority of this data is 2 (B10). Then, in the data, the priority 2 is entered in the priority column of db1 in FIG. 12B (B20).

Since the urgency of data and the priority are related to each other, it is assumed that the urgent flag is also set in the priority determining process S32 (B30). However, in this case,
In DB2 of FIG. 14, the priority of data is 2,
Since the urgent flag is 0, the urgent flag of the data remains the book.

Here, the delay processing and transmission timing will be described. In the data transmission method according to the present invention, the received data is not immediately transferred, but is temporarily stored in the delay buffer and the data is delayed.
This is because the unit of data transmission is not one and one data, but is divided into blocks and data is transmitted in units of frames. Then, when to finish the delay process is closely related to the timing of data transmission.

The timing for terminating the delay process and proceeding to the next process is when the timer monitoring unit activates the buffer due to a time request, and when the buffer is full, no more data can be stored. It is time to go. The delay process S34 described below with reference to FIG. 4 is based on such a situation.

First, in the delay process S34, it is determined whether or not a start command is issued from the timer monitoring unit (C1).
0).

When a start command is given from the timer monitoring section,
It is determined whether or not the delay buffer bf12 is empty (C4
0). When the delay buffer bf12 is empty, there is no data to be sent, so the start command from the timer monitoring unit is only canceled (C50 in FIG. 4). If it is not empty, the sorting process S35 is activated to proceed to the next process.

When no data is sent from the priority determining process S32 when the start command from the timer monitoring unit is not issued,
It is determined whether the delay buffer bf12 is full (C2
0). If the delay buffer bf12 is full, data can no longer be stored, and the rearrangement process S35 is activated to proceed to the next process. When not full,
The data is pooled in the delay buffer bf12 (C3
0). In addition, the delay buffer bf12 has a configuration shown in FIG.
It is stored in the format shown in (c).

Next, the processing of the timer monitoring unit m70 will be described with reference to FIG. As described above, the timer monitoring unit m70 plays a role of a trigger that terminates the delay process at regular time intervals and advances the data to the next step (G20). However, when the data is being stored in the delay buffer bf12, the process waits until the end (G10, G30). Further, in the present embodiment, the method of terminating the delay process at regular time intervals is used.
End the delay processing at the time programmed in advance,
It is also possible to encourage the transmission of data.

When the delay process S34 ends, the next rearrangement process S35 is started.

As described above, the delay buffer bf12
The format stored in was the format shown in FIG.

In the rearrangement process S35, the priorities in this priority column are compared (D10 in FIG. 5), and the higher priority is given (that is, the numerical value representing the priority is lower).
Then, the data is exchanged (D20 in FIG. 5). In this way, the data in the format shown in FIG. 12 (c) is rearranged in order of priority and stored as shown in FIG. 12 (d).

Next, the data thus rearranged is divided into blocks by the block forming process S36. Hereinafter, the blocking process S36 will be described in detail with reference to FIG.

In the blocking process S36, the following process is required to distinguish the urgent data having the urgent flag from the normal data not having the urgent flag.

First, it is determined whether or not the blocking process S36 is started from the emergency process S37 (E1).
0). In case of emergency data, as shown in FIG.
If YES in 33, the emergency processing S37 to the blocking processing S36 are started. Then, from the rearrangement processing S35, which is the activation route for normal data, the activation is temporarily stopped (E20).

Next, the maximum number of user bytes that can be taken in a frame is compared with the length of the data of each item, and a pattern is determined as to how to form a block (E30). According to this, the emergency data is only the emergency data, and the normal data is collected only by the normal data and is divided into blocks (E40).

Next, when handling the urgent data, it is determined whether or not the normal data is already stored in the block buffer bf14 (E50).

When the normal data is stored, the address of the normal data stored in the block buffer bf14 is shifted to bring the emergency data to the head of the buffer (E60).

In the example of FIG. 12D, there is no urgent data, and as shown in FIG. 12E, it is divided into two blocks and three blocks.

Up to now, only the normal data without the urgent flag has been taken as an example, but the case of transmitting the urgent data with the urgent flag will now be described.

For example, "disconnection of distribution line" and "opening of switch"
Suppose the priority of was 1. These two are information on the accident of the distribution line. Therefore, when these data are received, in the data type determination processing S31, D
The data type is set to 1 from the item of B1 and the priority of 1 is obtained from the priority determination processing S32, and the data of FIG.
Store as shown in. At the same time, since the priority is 1 in this case, the emergency flag is set to 1 according to a predetermined rule (B30 in FIG. 3).

Then, these two data are judged to be emergency data (S33), and as described above, the blocking process m36 is activated by the emergency process S37.

Also, as described above, when the normal data already exists, the process of bringing the urgent data to the head of the buffer is performed (E60 in FIG. 6).
The format becomes as shown in (g), and the "distribution line disconnection" dg1 and the "switch open" dg2 come to the head of the buffer.

The stored data is transmitted from the computer 1 to the computer 2a connected to the input / output device in the frame format shown in FIGS. 12 (h) and 12 (i) by the transmission unit m40 and processed by the computer 2a. The display 4a of FIG.
Display and printing can be performed by the printer, the printer 4b, or the like.

Next, according to the data transmission method of the present invention,
How to specifically transmit data in terms of timing will be described with reference to FIG.
FIG. 10 is a timing chart showing an example of timing when data is transmitted by the data transmission method of the present invention.

The data from the controlled object 3 was received and analyzed by the reception processing section and the data analysis section of the computer that monitors information.

Further, as described above, the received data is discriminated by the data type discrimination S31 in FIG. 1, and the data is prioritized by the priority determining means m32. Then, the data transmitted by the delay processing means S34 is pooled in the delay buffer bf12. The pooled data is tt1, tt2,
When a transmission request is received by the timer monitoring unit m70 at every predetermined time as indicated by tt3, the rearrangement process m3 is performed.
5 are sorted in order of priority. The rearranged data is grouped into blocks by the block forming process m36, only being stored in the frame.

As shown in FIG. 10, the computer which performs the display processing of the blocked data by the transmission unit m40,
It is transmitted at the timing of st1, st3, and st4, respectively.

On the other hand, when the priority determination processing m32 determines that the data is urgent data (timing shown by ut1 in FIG. 10), the urgent processing m37 causes the blocking processing m3.
6 gives priority to the emergency information and gives priority to the transmission of the emergency information.

As shown in FIG. 10, the data 5 of the emergency data is transmitted at st2 although the data generation is nt5. This is the data 3 generated at the timing of nt3, nt4, which is transmitted in st3,
It is understood that the data is transmitted earlier than the data 4.

Further, as described above, even if the timer is activated, while data is being stored in the delay buffer by the delay processing, waiting for the next processing is performed until the storage of the buffer is completed. Become.

[0066]

As described above, according to the present invention, it is possible to provide a data transmission method having a high data transmission efficiency while observing the priority of data to some extent when performing data communication between computers. In particular, it is possible to provide a data transmission method that can respond to an emergency by preferentially transmitting data that requires an emergency.

[Brief description of drawings]

FIG. 1 is a block diagram schematically showing the function of each unit of a data transmission system according to the present invention, and particularly a diagram in which the processing flow is written in a transmission processing unit m30.

FIG. 2 is a detail chart of a data type determination process S31.

FIG. 3 is a detail chart of priority determination processing S32.

FIG. 4 is a detail chart of delay processing S34.

FIG. 5 is a detail chart of rearrangement processing S35.

FIG. 6 is a detail chart of blocking processing S36.

FIG. 7 is a detail chart of emergency processing S37.

FIG. 8 is a detail chart showing the processing of the timer monitoring unit m70.

FIG. 9 is a schematic diagram of a system configuration that is supposed to perform data transmission by the data transmission method according to the present invention.

FIG. 10 is a timing chart showing an example of timing when data is transmitted by the data transmission method of the present invention.

FIG. 11 is a schematic diagram of each data format used in the data transmission method.

FIG. 12 is specific data handled by the power distribution maintenance system of the present embodiment (part 1).

FIG. 13 is specific data handled by the power distribution maintenance system of the present embodiment (part 2).

FIG. 14 is specific data stored in the database of this embodiment.

FIG. 15 is a block diagram showing a functional configuration of a computer that performs data transmission according to a conventional technique.

FIG. 16 is a timing chart showing a transmission timing of data transmission according to a conventional technique.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Computer (especially performs information monitoring and data transmission) 2a-2n ... Computer (2a particularly performs display processing) 3 ... Control object 4a ... Display 4b ... Printer 4c ... Magnetic disk m10 ... Reception processing unit m20 ... Data analysis section m30 ... Transmission processing section S31 ... Data type determination processing S32 ... Priority determination processing S33 ... Urgent information determination processing S34 ... Delay processing S35 ... Rearrangement processing S36 ... Blocking processing S37 ... Emergency processing m40 ... Transmission section m60 ... Database unit m70 ... Timer monitoring unit bf10 ... Type buffer bf11 ... Priority buffer bf12 ... Delay buffer bf13 ... Sorting buffer bf14 ... Blocking buffer bf15 ... Transmission buffer 100 ... Reception processing unit 200 ... Data analysis unit 300 ... Transmission unit

Claims (5)

[Claims] 1. A data transmission method for performing communication between a plurality of data processing systems, wherein in a data processing system on a transmission side, data to be transmitted has a priority for data transmission, and (1) delays the data. And (2) a step of rearranging the stored data in the order of the priority, (3) a step of dividing the rearranged data into blocks, and the steps (1) to (3) above. The data transmission method is characterized in that the blocked data is transmitted in this order. 2. The data processing system on the transmitting side includes a database for determining a priority for data transmission of data to be transmitted, and (0a) searches the database for the priority of data to be transmitted. 2. The data transmission method according to claim 1, wherein the procedure for determining is performed before the procedure (1). 3. The data to be transmitted has an urgent flag indicating that it is urgent, and when this urgent flag is set, this data is blocked into normal data that does not have the urgent flag and is converted into normal data. 3. The data transmission method according to claim 1, wherein the data is transmitted in advance. 4. The data processing system on the transmitting side includes a database for determining the urgent flag of data to be transmitted, and (0b) searching the database for ON / OFF of the urgent flag of data to be transmitted. 4. The data transmission method according to claim 3, wherein the determining step is performed before the step (1). 5. The data processing system on the transmitting side includes a timer monitoring unit, and in accordance with a command from the timer monitoring unit, ends the procedure of (2) and proceeds to the next procedure. Item 1
5. The data transmission method according to claim 4.