JP2002229886A - Data sending and receiving method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve sending and receiving efficiency of data by selecting a compression algorithm in accordance with each load of a sending source computer, a sending target computer, and a network. SOLUTION: A compression control part 20-N of the computer 1-N to be a sending source of the data retrieves a compression format of data to the sending target computer 1-N from a compression information data base 50-N and compresses the data. A communication control part 10-N sends the data to the network 2, and a communication control part 10-N of the sending target computer receives the data. After depression of the data, a depression control 20-N sends a response message to the sending source computer. In the sending source computer, the communication control part receives the response message and a load determination control 40-N determines loaded conditions of the sending source and target computers and the network from compression/ depression time and sending and receiving time of the data. It automatically lowers a compression ratio if a load of one of the sending source or target computer is high, and it raises the compression ratio if a load of the network is high.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transmission / reception method, and more particularly to a data transmission / reception method capable of reducing network load by compressing data for data transfer between computer systems. About.

[0002]

2. Description of the Related Art As a conventional technique capable of reducing a network load by compressing and transferring data, for example, a technique described in Japanese Patent Application Laid-Open No. 2000-83029 is known. In this prior art, data having different compression ratios is prepared in advance for the same data, and the data is selected and transferred according to the network load.

[0003]

However, in the above-mentioned conventional method, the compression rate of data to be transferred is controlled by monitoring only the network load, and the load of the decompression processing at the transmission destination is considered. If the load of decompression processing at the destination is higher than the network load, the total time of data compression time at the source, data transmission time on the network, and data decompression time at the destination is not However, there is a problem that communication efficiency may be reduced. Also, the prior art described above is
Since it is necessary to compress data in advance, there is a problem that useless compression work is generated when data is created and transmitted immediately.

An object of the present invention is to solve the above-mentioned problems of the prior art, and to change the data compression format (compression ratio) according to the load of a network, a source computer and a destination computer, thereby obtaining data. An object of the present invention is to provide a data transmission / reception method that enables efficient transmission / reception processing.

[0005]

According to the present invention, an object of the present invention is to provide a data transmission / reception method for compressing and transmitting data and decompressing received data at a partner device, wherein the transmitting device comprises:
While determining the data compression load in the own device, based on the response data from the other device and the arrival time thereof, determine the data decompression load in the other device and the network load for transmission and reception, This is achieved by changing the compression / decompression method based on the determined load.

According to the present invention, by providing the above-described means, it is possible to reduce the load of a high-load process and efficiently transmit and receive data.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a data transmission / reception method according to the present invention.

FIG. 1 is a block diagram showing a configuration of a network system including a computer for executing a method according to an embodiment of the present invention, FIG. 2 is a diagram for explaining the contents of a compression information database (DB), and FIG. FIG. 4 is a diagram for explaining the data format of a message transmitted in a divided manner, FIG. 4 is a diagram for explaining the data format of a response message to a message transmitted in a divided manner, FIG. 5 is a diagram for explaining a specific example of the contents of a compression information DB, FIG. 6 is a diagram illustrating a specific example of the data format of a message that is divided and transmitted, and FIG. 7 is a diagram illustrating a specific example of the data format of a response message to a message that is divided and transmitted. 1 to 7, 1-
1-N is a computer, 2 is a network, 10-1 to
10-N is a communication explanation unit, 20-1 to 20-N are compression control units, 30-1 to 30-N are decompression control units, 40-1 to 40
-N is a load determination control unit, 50-1 to 50-N are compression information DBs, 70, 70-1 to 70-3 are transmission messages, 8
0, 80-1, and 80-2 are response messages.

As shown in FIG. 1, in a network system including a computer for performing a method according to an embodiment of the present invention, a plurality of computers 1-1 to 1-N are connected to a network 2 and mutually transmit data messages. It is configured to be able to transmit and receive. Then, a plurality of computers 1-1 to 1-1
-N are communication control units 10-1 to 10-N having a function of transmitting and receiving data and compression control units 20-1 to 20-N having a function of dividing and compressing data.
Decompression control units 30-1 to 30-N having a function of decompressing and combining data, and load determination control units 40-1 to 40 having a function of determining load on a computer and a network
-N, and compression information DBs 50-1 to 50-N used by the load determination control units 40-1 to 40-N to determine the compression format.

The compression information DBs 50-1 to 50-N used by the load determination controls 40-1 to 40-N to determine the compression format include:
As shown in FIG. 2, it is configured by a table for registering compression information 60-1 to 60-X including a transmission destination 61, a specified compression format 62, and a final compression format 63. Compression information 60-1
60-X are set for each computer that transmits and receives data, and are registered in the compression databases 50-1 to 50-N.

The transmission destination 61 and the specified compression format 62 are registered by the user in advance, and the final compression format 63 is set by the load determination controls 40-1 to 40-N when data transmission is completed. The final compression format 63 is used at the start of the next data transmission to determine the compression format using the transmission destination as a key.

[0012] Final compression format 63 at the time of first data transmission, etc.
Is not set, the specified compression format 62 is adopted as the compression format. Compression information database 50-1 to 5
When the compression information 60-1 to 60-X of the transmission destination is not registered in 0-N, the registered standard compression information 62 has an average value of each of the standard compression formats 1 to X as the compression ratio. Register as a compression format.

The transmission message 70 is transmitted from the computers 1-1 to 1-1.
-N is data transmitted from the computer 1-1 to another computer 1-1 to 1-N. As shown in FIG. 3, a compression format 71, a division number 72 when a transmission message is divided and transmitted, and whether a response is required. Response request 73, data length 74,
It is composed of transmission data 75.

When the transmission data is large, the compression control units 20-1 to 20-N divide the data, and
The divided transmission data 75 compressed by the above is generated, a unique division number 72 is provided for each divided data, a response request 73 indicating whether or not a response message is requested from the transmission destination, and a transmission indicating the size of the divided transmission data 75 The data length 74 is collectively generated as a transmission message 70.

The response message 80 is the transmission message 7
0 which has received the transmission message 7
0, which is a message responding to the computers 1-1 to 1-N that have transmitted 0, as shown in FIG. 4, a division number 81 corresponding to the division number 72 of the received message, and a decompression time 82 of the received divided data. , Compression time 8 of response data 85
3. The data length 84 of the response data 85 and the response data 85 having the specific contents requested by the received message.

FIG. 5 shows a specific example of the compression information DB used for data compression / decompression described above with reference to FIG. The illustrated example is an example of a compression information DB in which compression information 60-1 to 60-2 storing specific information in the transmission destination HS, the specified compression format DD, and the final compression format FD are registered. . In the compression information 60-1, the transmission destination “HS1”, the specified compression format “3”, and the final compression format “2” are set. The transmission destination “HS2” and the specified compression format “1” are set in the compression information 60-2. Note that the compression format of the example shown in FIG. 5 indicates a compression ratio for convenience of explanation.

That is, the illustrated compression information DB is
Indicates that when transmitting a data to the computer "HS1", the first divided data is compressed and transmitted in the final compression format "2". In addition, the calculator "H
When transmitting data to "S2", since the final compression format is not set, compression is performed in the specified compression format "1".

When data is transmitted to the destination "HS3" which is not registered in the compression information database 50-N, new compression information 60-3 is stored in the compression information database 50-N as "HS3" in the transmission destination HS. , And new compression information in which the average value “2” is set in the specified compression format DD.

FIG. 6 shows an example of the transmission message described above with reference to FIG. In this figure, transmission messages 70-1 to 70-3 are generated by dividing and compressing one transmission data.

The transmission message 70-1 is configured by setting a compression format "1", a division number "3", a response request "Yes", a data length "10", and division transmission data "SD1". . The transmission message 70-2 is
Compression format "1", division number "2", response request "none",
The data length “8” and the divided transmission data “SD2” are set and configured. Further, the transmission message 70-3
Is composed of a compression format “2”, a division number “1”, a response request “present”, a data length “5”, and division transmission data “SD3”.

That is, the transmission message shown in FIG.
This is an example in which one transmission data is divided into three, and three transmission messages 70- having division numbers "3" to "1"
1 to 70-3. The division numbers are assigned in descending order to the plurality of divided messages. Therefore, the transmission message 70-1 compresses the data of the division number "3" in the compression format "1", and as a result, the data length becomes "10" and the division transmission data "SD1". Request. The transmission message 70-2 compresses the data of the division number “2” in the compression format “1”, and as a result,
The data length is "8" and the divided transmission data is "SD2", indicating that no response message is requested to the transmission destination. Also, the transmission message 70-3 changes the data of the division number "1" into the compression format "2" and compresses the data, resulting in the data length "5" and the divided transmission data "SD3". Indicates that a response message is being requested. Then, this transmission message 70-3
Indicates that the data is the last divided transmission data by the division number “1”.

FIG. 7 shows an example of the response message described above with reference to FIG. In this figure, the response message 80-1 is a response message to the transmission message 70-1 because the division number is "3", and the decompression time of the division transmission data SD1 is "DT1".
As a result of compressing the response data in the same compression format "1" as the divided transmission data SD1, the data length "3" and the response data "RD
"1", indicating that the compression time of the response data has taken "CT1". The response message 80-
2 is a response message to the transmission message 70-3 because the division number is "1", and indicates that the decompression time of the divided transmission data SD3 is "DT2" and there is no response data.

FIG. 8 is a flowchart for explaining the processing operation of data transmission according to the embodiment of the present invention, which will be described below. Here, the description will be given on the assumption that the computer 1-N issues a data transmission request.

(1) When a data transmission request is generated in the computer 1-N, the compression control unit 20-N sets the compression information DB 50-N
With reference to N, the compression information 60-1 to 60-X are searched, and it is checked whether there is compression information having the same transmission destination (step 801).

(2) If it is determined in step 801 that the corresponding compression information is not registered, the specified compression format 1
The compression format having the average value of the compression ratios of .about.X is registered as the destination compression information 62 and the final compression information 63, and this compression format is selected as the transmission data compression format (step 802).

(3) If there is matching compression information in the check at step 801, it is determined whether or not the retrieved compression information has the final compression format set. If the final compression format has not been set, The specified compression format is selected as the transmission data compression format, and if the final compression format is set, the final compression format is selected as the transmission data compression format (steps 803 to 805).

(4) Next, it is determined whether or not the size of the transmission data is larger than a predetermined value. If the size is larger, the data is divided and a division number 72 is assigned to each divided data. If the size of the transmission data is equal to or smaller than the predetermined value, "1" is set as the division number without dividing the data (steps 806 and 807).

(5) Of the divided transmission data, the largest one of the division numbers 72 is compressed in the compression format selected in step 802, 804 or 805 to generate divided transmission data 75 and data length 74. , The compression format 72 is set in the transmission message 70 (step 8).
08).

(6) Next, whether the divided transmission data 75 is the first divided data, or a response message 80 to a response request of the already transmitted transmission message 70
Is determined, if the divided transmission data 75 is the first divided data or if the response message 80 has been received, the response request 73 is set to “Yes”, and the response request “Yes” If the response message is not received after the transmission message is transmitted, the response request 73 is set to "none" (steps 809 to 811).

(7) Next, the communication control unit 10-N includes a compression format 71, a division number 72, a response request 73, and a data length of 7.
4. The transmission message 70 is generated from the divided transmission data 75 and transmitted to the transmission destination computer (step 812).

(8) It is checked whether or not the response message 80 has arrived from the transmission destination. If the response message has arrived, the communication control unit 10-N sets the response message
0 is received (steps 813 and 814).

(9) It is determined whether or not the response data 84 is included in the received response message. If the response data is not 0, that is, if the response data exists, the response data is decompressed in the compression format 81. (Steps 815 and 81
6).

(10) Next, the load judgment control unit 40-N
The time obtained by adding the decompression time 82 and the compression time 83 is determined as the CPU load of the transmission destination computer, and the time obtained by adding the compression time of the divided transmission data 75 and the decompression time of the response data 85 is calculated as the CPU load of the transmission source computer. The CPU with the larger load is selected as the CPU load (step 817).

(11) The required time between the transmission time of the transmission message 70 and the arrival time of the response message 80 is calculated, and the decompression time 82 of the divided transmission data 75 and the response data 85 at the destination are calculated from the required time. The value obtained by subtracting the compression time 83 is calculated as the network load (step 81).
8).

(12) It is determined whether or not the network load is greater than the CPU load. If the network load is greater, the compression format is changed to a format having a higher compression rate. If the network load is not greater than the CPU load, the network load is reduced. It is determined whether the load is smaller than the CPU load. If the load is smaller, the compression format is changed to a format having a lower compression ratio. If the network load is neither larger nor smaller than the CPU load, that is, if the network load is the same as the CPU load,
Leave the compression format as it is (steps 819-82)
2).

(13) After the processing of steps 819 to 822,
Alternatively, if there is no incoming response message in step 813, it is determined whether there is untransmitted divided data. If there is untransmitted divided data, the process returns to step 808 and repeats the processing up to step 822. (Step 823).

(14) If there is no untransmitted divided data in the determination in step 823, it is determined whether there is a response message that has not arrived. If there is a response message that has not arrived, the response message is received. After waiting, the process from step 814 is repeated (steps 824 and 825).

(15) If it is determined in step 824 that all response messages have been received, the compression format is registered in the final compression format of the compression information database, and it is determined whether or not there is untransmitted transmission data. If there is untransmitted transmission data, the flow returns to the processing from step 801 and repeats the processing. If all the transmission data has been transmitted, the processing ends (steps 826 and 827).

FIG. 9 is a flowchart for explaining the processing operation of data reception according to the embodiment of the present invention, which will be described below. Note that, also here, the description will be given on the assumption that the computer 1-N receives data.

(1) Waiting for a request to receive a transmission message from the transmission source computer, and when a transmission message is received, the communication control unit 10-N receives the transmitted message (steps 901 and 902). ).

(2) Next, the decompression control 20-N determines the decompression format according to the compression format 71 in the received message, and determines the divided transmission data 75 in the divided transmission message 70.
Is decompressed (steps 903 and 904).

(3) It is determined whether or not response data to the transmission source computer is necessary. If the response data is required, the compression control unit 30-N compresses the response information in the transmission message compression format 72. Then, response data 85 is generated (steps 905 and 906).

(4) If it is determined in step 905 that no response data is required, it is determined whether the arrival interval of the transmission message or the decompression time of the divided transmission data has changed.
When the arrival interval of the transmission message or the decompression time of the divided transmission data changes, the division number 81 is set to “none”, the compression time is set to “0”, the data length 84 is set to “0”, and the response data 85 is set to “none”. The communication control 10-N includes a division number 81, a decompression time 82, a compression time 83, a data length 8
4. combining the response data 85 or the response data 85 generated in step 906 to generate a response message 80;
Responds to the source computer (steps 907, 908).

(5) The division number 72 is checked to determine whether there is the next division data, and the military officer communication number is "1".
If so, the process returns to step 902 to repeat the process (step 909).

(6) If it is determined in step 909 that the division number 72 is “1” and that there is no next divided data, the decompressed divided transmission data 75 is combined, and the compression format 71 is changed to the compression information database. The value is set to 50-N, and the flow returns to the processing from step 901 to wait for the next reception request (steps 910 and 911).

According to the embodiment of the present invention as described above, it is possible to perform load distribution of transmission processing to a network, data compression processing at a transmission source, and decompression processing of data at a transmission destination. Data transfer can be performed, and two-way communication is possible between the transmission source and the transmission destination.

The above-described embodiment of the present invention is capable of processing even if the time (clock) is shifted between the transmission source and the transmission destination, and requires a special device for monitoring the load on the computer and the network. , And efficient data transfer can be performed.

[0048]

As described above, according to the present invention, data transmission / reception processing can be performed efficiently, and more efficient data transfer can be performed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a network system including a computer for performing a method according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating the contents of a compression information database (DB).

FIG. 3 is a diagram illustrating a data format of a message that is divided and transmitted.

FIG. 4 is a diagram illustrating the data format of a response message to a message that has been divided and transmitted.

FIG. 5 is a diagram illustrating a specific example of the contents of a compression information DB.

FIG. 6 is a diagram illustrating a specific example of a data format of a message that is divided and transmitted.

FIG. 7 is a diagram illustrating a specific example of a data format of a response message to a message that has been divided and transmitted.

FIG. 8 is a flowchart illustrating a data transmission processing operation according to the embodiment of the present invention.

FIG. 9 is a flowchart illustrating a data reception processing operation according to the embodiment of the present invention.

[Explanation of symbols]

 1-1 to 1-N Computer 2 Network 10-1 to 10-N Communication Explanation Unit 20-1 to 20-N Compression Control Unit 30-1 to 30-N Decompression Control Unit 40-1 to 40-N Load Judgment Control Part 50-1 to 50-N Compression information DB 70, 70-1 to 70-3 Transmission message 80, 80-1, 80-2 Response message

Claims (4)

[Claims] In a data transmission / reception method for compressing and transmitting data and decompressing received data at a partner device, a transmitter device determines a data compression load on its own device, and determines a load of data compression from the partner device. A load of data decompression on the partner device and a network load for transmission / reception are determined based on the response data and the arrival time thereof, and a compression / decompression method is changed based on the determined load. How to send and receive data. 2. The data transmission / reception method according to claim 1, wherein a load state of the own apparatus and a load state of the other apparatus are monitored by focusing on a data compression time and a decompression time. 3. The data transmission / reception method according to claim 1, wherein a load state of the network is monitored by paying attention to a time from transmission of data to arrival of response data. 4. The data according to claim 1, wherein data to be transmitted is divided, and a compression / decompression method is dynamically changed according to a load state during transmission of the divided data. Transmission / reception method.