JP4805786B2 - Data transfer system and data transmission apparatus - Google Patents

Description

The present invention relates to a data transfer system and a data transmitting device.

  The data transfer system includes a data transmission device and a data reception device connected to each other via a network line. The data transmitting apparatus divides data to be transmitted to the data receiving apparatus into a predetermined division size, and then transmits the divided data to the data receiving apparatus. When the data receiving apparatus receives all of the divided data, the data receiving apparatus combines and restores the divided data.

An example of such a data transfer system is shown in the conventional document (Patent Document 1). In this conventional data transfer system, it is described that the data division size is simply halved when attempting to retransmit the divided data after the transmission of the divided data from the data transmitting device to the data receiving device fails. Yes.
Japanese Patent Laid-Open No. 2004-349884

  In the data transfer technology according to the prior art, the divided data is transmitted after the data is divided into a predetermined division size regardless of the communication state of the network line. For this reason, when the network line is congested and the communication speed is slow, if the size of the divided data is too large, the communication session is cut off before the transmission of the divided data is completed, and the retry of the divided data transfer is retried. Will be repeated. On the other hand, if the data division size is always reduced in order to avoid such a problem, the time required for data division and combination increases.

The present invention has been made to solve the above problems, and an object thereof is to provide a data transfer system and data transmission equipment which can transfer data quickly and stably.

To achieve the above-described object, a data transfer system according to the present embodiment is a data transfer system including a data transmission device and a data reception device connected to each other via a network, and detects a communication load on the network. A load detection unit, a determination unit that determines a division size of transmission data based on a communication load detected by the load detection unit, and a time required for data transfer from a division start considering a retry to a completion of combination; Dividing means for dividing the transmission data into the sizes determined by the determining means.

In addition, the data transmission apparatus according to the present embodiment is a load detection unit that detects a communication load of a network, a communication load detected by the load detection unit, and data transfer from the start of division to the completion of combination considering retry. And determining means for determining a transmission data division size based on the time required, and dividing means for dividing the transmission data into the size determined by the determination means.

According to the present invention, it is possible to provide a data transfer system and data transmission equipment which can transfer data quickly and stably.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[First Embodiment]
FIG. 1 shows a block diagram of a data transfer system 1 in which the data acquisition method is a PUT type. The data transfer system 1 includes a data transmission device 10 and a data reception device 30 that are connected to each other via a network line. Here, the network line is the Internet, a local area network, or the like.

  The data transmission device 10 includes a data input / output device 12 and a data processing device 14. The data input / output device 12 includes a display, a keyboard, a mouse, and the like. As an operation related to data transfer, the operator registers transfer data in the data processing device 14 or the data receiving device 30 where the operator is a data transfer destination. Is used to specify the data to be transmitted to the data receiving device 30 by the operator.

The data processing device 14 includes a central processing unit (CPU), a random access memory (RAM), a read only memory (ROM), and the like as physical configurations. The data processing device 14 includes, as a functional configuration, a data capture processing unit 16, a transfer destination information acquisition processing unit 18, a network load status monitoring processing unit 20, a data division size setting processing unit 22, and a data division processing unit. 24 and a data transmission processing unit 26. These functional configurations are realized by the data processing device 14 executing a data transfer processing program. The network load status monitoring processing unit 20 corresponds to the load detection means that put the claims, the data division size setting processing unit 22, corresponds to the decision means that put the claims, the data a division processing section 24, but corresponds to the split means that put the claims.

  The data capture processing unit 16 accepts designation of a data transfer destination by the operator and designation of data to be transferred. When the operator designates a data transfer destination, the transfer destination information acquisition processing unit 18 requests network information (number of LAN ports, IP address of each LAN port, etc.) from the data receiving device 30 that is the transfer destination. A request signal is transmitted, and network information from the data receiving device 30 that is a transfer destination is received. The network load status monitoring processing unit 20 transmits a signal for detecting the network load to the data receiving device 30 that is the transfer destination, and the time required for the signal to travel between the data transmitting device 10 and the data receiving device 30 Is used to detect the communication load that is the degree of congestion of the network line. The data division size setting processing unit 22 determines an optimum data division size according to the communication load of the network line. The data division processing unit 24 divides the data to be transferred into data division sizes, and the data transmission processing unit 26 sequentially transmits the divided data.

  The data receiving device 30 includes a data input / output device 32 and a data processing device 34. The data input / output device 32 includes a display, a keyboard, a mouse, and the like. The data input / output device 32 is used by an operator to confirm data transfer from the data transmission device 10 and for an operator to take out data from the data transmission device 10.

  The data processing device 34 includes a CPU, RAM, ROM and the like as a physical configuration. The data processing device 34 includes a transfer destination information provision processing unit 36, a data reception processing unit 38, a data combination processing unit 40, and a data extraction processing unit 42 as functional configurations. These functional configurations are realized by the data processing device 34 executing a program for data transfer processing.

  When receiving a signal requesting network information from the data transmission device 10, the transfer destination information provision processing unit 36 transmits the network information of the data reception device 30 to the data transmission device 10. The data reception processing unit 38 receives the divided data that has arrived from the data transmission device 10 via the network. The data combination processing unit 40 combines the divided data and restores the original data before the division. The data extraction processing unit 42 passes the restored data to the data input / output device 32. The data input / output device 32 displays information on the data transferred from the data transmission device 10 on a display, or provides the operator with the data transferred from the data transmission device 10.

  Data transfer processing in the above-described data transfer system 1 will be described. FIG. 2 shows a flowchart of the data transfer process. The process shown in FIG. 2 is a process performed when the data transmission device 10 and the data reception device 30 execute a data transfer processing program.

First, when an operator designates a data receiving device 30 as a data transfer destination using the data input / output device 12 of the data transmitting device 10 and further designates data to be transferred to the transfer destination, The data processing device 14 of the transmission device 10 receives the designation of the data transfer destination and the data to be transferred (S201). The designation operation by the operator may be performed by dragging and dropping the data on the client side to the server side in the screen display shown in FIG.

  Next, the data transmitting apparatus 10 transmits a request signal for requesting network information to the data receiving apparatus 30 that is a data transfer destination (S202). In response to this request signal, the data receiving device 30 transmits network information to the data transmitting device 10 (S203). Through such exchange, the data transmission device 10 acquires network information of the data reception device 30 (S204).

  Next, the data transmitting apparatus 10 detects the load state of the network line between transmission and reception (S205). More specifically, the data transmission device 10 transmits a network load detection signal to the data reception device 30 that is a data transfer destination, and the data reception device 30 transmits the signal from the data transmission device 10. The time until reception by the data receiving device 30 is measured, and the data receiving device 30 transmits information on the measured time to the data transmitting device 10 to detect the communication load on the network line.

Next, the data transmitting apparatus 10 determines the optimum data division size D from the network load situation (S206). The data transmitting apparatus 10 uses the following formula (1) in order to determine the optimum data division size D. The following formula (1) will be described in detail later.

  Next, the data transmitting apparatus 10 divides the data to be transmitted to the data receiving apparatus 30 into the data division size calculated by the above equation (1), and transmits the divided data to the data receiving apparatus 30 ( S207). Thereby, the data receiving device 30 receives the divided data (S208).

  Next, the data transmitting apparatus 10 determines whether all the data has been transmitted (S209). If it is determined in step 209 that the data transmission has not been completed, the data transmitting apparatus 10 returns to the processing in step 205 and repeats the processing from step 205 to step 207. On the other hand, when it is determined in step 209 that the data transmission is completed, the data transmitting apparatus 10 proceeds to the process of step 210 and transmits a transmission completion notification to the data receiving apparatus 30.

  When receiving the transmission completion notification that arrives via the network, the data receiving device 30 combines the divided data and restores the original data before the division (S211 and S212).

  According to the data transfer process described above, data is divided into an optimal data division size and transmitted, so the time required for data transfer retry and the time required for data division / combination can be reduced. Can be performed quickly and stably. In particular, according to the data transfer process described above, the network load situation is repeatedly detected between the start of data transfer and the completion of data transfer, and the optimum data division size D is determined according to the network load situation. Therefore, the data division size can be adjusted to an optimum value in real time, and data transfer can be performed quickly and stably.

[Second Embodiment]
FIG. 3 shows a block diagram of the data transfer system 3 whose data acquisition method is the GET type. The data transfer system 3 includes a data transmitting device 50 and a data receiving device 70 connected to each other via a network line. Here, the network line is the Internet, a local area network, or the like.

  The data transmission device 50 includes a data input / output device 52 and a data processing device 54. The data input / output device 52 includes a display, a keyboard, a mouse, and the like, and is used by an operator to register transfer data in the data processing device 54.

  The data processing device 54 includes a CPU, RAM, ROM and the like as a physical configuration. The data processing device 54 includes a data fetch processing unit 56, a transfer destination information acquisition processing unit 58, a data division processing unit 64, and a data transmission processing unit 66 as functional configurations. These functional configurations are realized by the data processing device 54 executing a program for data transfer processing.

  The data capture processing unit 56 accepts registration of data to be transferred by the operator. The transfer destination information acquisition processing unit 58 receives network information (the number of LAN ports, the IP address of each LAN port, etc.) from the data receiving device 70 that is the transfer destination. The data division processing unit 64 divides the data to be transferred into data division sizes, and the data transmission processing unit 66 sequentially transmits the divided data.

  The data receiving device 70 includes a data input / output device 72 and a data processing device 74. The data input / output device 72 includes a display, a keyboard, a mouse, and the like. As an operation related to data transfer, the operator designates the data transmission device 50 that is the data transfer source, or the operator transmits from the data transmission device 50. Used to specify data to be used.

  The data processing device 74 includes a CPU, RAM, ROM, and the like as a physical configuration. The data processing device 74 includes a data acquisition request processing unit 76, a transfer source information processing unit 78, a data transmission request processing unit 80, a data division size setting processing unit 82, and a network load status monitoring process as functional configurations. Section 84, data reception processing section 86, data combination processing section 88, and data extraction processing section 90. These functional configurations are realized by the data processing device 74 executing a program for data transfer processing. The network load status monitoring processing unit 84 corresponds to the network load detecting means in the claims, the data division size setting processing unit 82 corresponds to the data division size determining means in the claims, and the data transmission request The processing unit 80 corresponds to the data transmission request unit in the claims.

The data acquisition request processing unit 76 accepts designation of the data transmission device 50 as a data transfer source by the operator and designation of data to be transmitted from the data transmission device 50. The transfer source information processing unit 78 acquires network information of the data transmission device 50 designated by the operator.

  The network load status monitoring processing unit 84 requests the data transmission device 50 as a transfer source to transmit a signal for detecting the network load, and the data reception device 70 receives the signal after the signal is transmitted from the data transmission device 50. By measuring the time until the communication load, the communication load that is the degree of congestion of the network line is detected. The data division size setting processing unit 82 determines an optimum data division size according to the communication load of the network line.

  The data transmission request processing unit 80 transmits the network information of the data receiving device 70 and the information of the optimum data division size to the data transmitting device 50 designated by the operator. In accordance with the information on the optimum data division size, the data transmission device 50 divides the data to be transmitted into the data division size and transmits the data. The data reception processing unit 86 receives the divided data that has arrived from the data transmission device 50 via the network. The data combination processing unit 88 combines the divided data and restores the original data before the division. The data extraction processing unit 90 passes the restored data to the data input / output device 72. The data input / output device 72 displays information on the data transferred from the data transmission device 50 on a display or provides the operator with the data transferred from the data transmission device 50.

  Data transfer processing in the above-described data transfer system 3 will be described. FIG. 4 shows a flowchart of data transfer processing. The process shown in FIG. 4 is a process performed when the data transmission device 50 and the data reception device 70 execute a data transfer processing program.

  First, when an operator registers data to be transferred to the data receiving device 70 in the data processing device 54 of the data transmitting device 50 using the data input / output device 52 of the data transmitting device 50, the data processing device 54 is registered by the operator. Is received (S401).

  Next, when the operator uses the data input / output device 72 of the data receiving device 70 to specify the data transmission device 50 that is the data transfer source and further specifies the data to be transferred to the transfer destination, The data processing device 74 of the data receiving device 70 receives designation of the data transfer source and the data to be transferred (S402). The designation operation by the operator may be performed by dragging and dropping the data on the client side to the server side in the screen display shown in FIG.

  Next, the data receiving device 70 confirms and acquires the network information of the transfer source designated by the operator (S403).

  Next, the data receiving device 70 detects the load state of the network line between transmission and reception (S404). More specifically, the data receiving device 70 requests the data transmitting device 50 to transmit a signal for detecting the network load, the data transmitting device 50 transmits a signal for detecting the network load to the data receiving device 70, and the data The receiving device 70 detects the communication load of the network line by measuring the time from when the signal is transmitted from the data transmitting device 50 until it is received by the data receiving device 70.

Next, the data receiving device 70 determines the optimum data division size D from the network load situation (S405). The data receiving device 70 uses the following formula (2) in order to determine the optimum data division size D. The following formula (2) will be described in detail later.

  Next, the data receiving device 70 transmits to the data transmitting device 50 a signal requesting that the data to be transferred be divided into the data division size calculated by the above mathematical expression (2) (S406). . Upon receiving this signal, the data transmission device 50 divides the data to be transferred into the data division size calculated by the above equation (5), and transmits the divided data to the data reception device 70 (S407). Thereby, the data receiving device 70 receives the divided data (S408). Note that, when all the data has been transmitted, the data transmission device 50 transmits a transmission completion notification to the data reception device 70 (S409).

  Next, the data receiving device 70 determines whether all data has been transmitted (S410). If it is determined in step 410 that the data transmission has not been completed, the data receiving device 70 returns to the process of step 404 and repeats the process from step 404 to step 408. On the other hand, if it is determined in step 410 that the data transmission has been completed, the data receiving device 70 proceeds to the process of step 411, combines the divided data, and restores the original data before the division. (S411).

  According to the data transfer process described above, data is divided into an optimal data division size and transmitted, so the time required for data transfer retry and the time required for data division / combination can be reduced. Can be performed quickly and stably. In particular, according to the data transfer process described above, the network load situation is repeatedly detected between the start of data transfer and the completion of data transfer, and the optimum data division size D is determined according to the network load situation. Therefore, the data division size can be adjusted to an optimum value in real time, and data transfer can be performed quickly and stably.

[Explanation of data division size calculation]
Next, the derivation of the arithmetic expression for the data division size of the above formulas (1) and (2) will be described.

In order to explain the derivation of the data division size arithmetic expression, first, various parameters related to data division, transfer, and combination will be described. Various parameters related to data division, transfer, and combination are defined as follows.
Data size: L [Mbyte]
Data division size: D [Mbyte]
Number of divisions: N [pieces]
Transfer rate: V [byte / sec]
Transfer rate per session: v [byte / sec]
Total transfer time: T [sec]
Number of retries: R [times / piece]
Unit division / combination time: U [sec / piece]

The division number N is expressed by the following formula (3).

The retry number R is expressed by the following formula (4). The following equation (4) is based on the fact that the retry count R increases as the data division size D increases, and the retry count R increases as the transfer speed v per session decreases as the network line is congested. Yes. In the following formula (4), a is a constant depending on the network environment.

The total transfer time T is expressed by the following formula (5). In the following equation (5), the total transfer time T is the sum of the time required for dividing data, the time required for transferring divided data, and the time required for combining divided data.

Considering Equation (3) and Equation (4), Equation (5) becomes the following Equation (6).

Further, assuming that L * U = A, {(a * L) / (v * V)} = B, Equation (6) becomes the following Equation (7).

When the total transfer time T is differentiated by the data division size D, the following formula (8) is obtained.

Since the value of dT / dD is 0 when the total transfer time T is minimized, the following equation (9) is obtained.

By transforming Equation (9), Equation (10) representing the data division size D when the total transfer time T is minimized is derived.

  The data division size D calculated by the above equation (10) minimizes the total transfer time required from the start of data transmission by the data transmission device to the completion of data reception by the data reception device. Data transfer can be performed quickly and stably. In the above-described embodiment, the total transfer time is the minimum value itself, but in other embodiments, the total transfer time may be a value that is slightly deviated from the minimum value.

  In particular, the data division size D calculated by the above equation (10) takes into account the data transfer retry when the data transfer from the data transmitting device to the data receiving device fails, so that the data transfer retry is considered. Data transfer can be performed quickly and stably by minimizing the total transfer time including the time required.

Note that when the data division size setting processing unit calculates the data division size D according to Equation (10), known values are used for the parameters L, U, and a. The parameter v is a value detected by the network load status monitoring processing unit, and the parameter V is calculated by an approximate expression based on the parameter v.

The approximate expression of the transfer rate V is expressed by, for example, the following expression (11). In the following formula (11), n is the number of sessions.

Equation (11) approximates the relationship between the number of FTP (File Transport Protocol) sessions n and the transfer rate V shown in FIG. That is, when the number of sessions is small, the transfer rate V is approximately proportional to the number of sessions, and when the number of sessions is large, the transfer rate V does not change according to the number of sessions. In the present embodiment, the approximate expression of the transfer rate V is expressed by Expression (11). However, since the transfer speed V varies depending on the network environment, the approximate expression (11) varies depending on the network environment.

  The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments. For example, in the first embodiment and the second embodiment described above, either the data transmission device or the data reception device is provided with both the network load status monitoring processing unit and the data division size setting processing unit. The network load status monitoring processing unit may be provided in either the device or the data receiving device, and the data division size setting processing unit may be provided in the other of the data transmitting device 10 or the data receiving device 30.

1 is a block diagram showing a data transfer system according to a first embodiment. It is a flowchart of the data transfer process which concerns on 1st Embodiment. It is a block diagram which shows the data transfer system which concerns on 2nd Embodiment. It is a flowchart of the data transfer process which concerns on 2nd Embodiment. It is a figure which shows the screen displayed on a display for a data transfer process. 6 is a graph showing the relationship between the number of FTP sessions n and the transfer rate V

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Data transfer system, 10 ... Data transmission apparatus, 12 ... Data input / output device, 14 ... Data processing apparatus, 16 ... Data acquisition process part, 18 ... Transfer destination information acquisition process part, 20 ... Network load condition monitoring process part, 22 ... Data division size setting processing unit, 24 ... Data division processing unit, 26 ... Data transmission processing unit, 30 ... Data reception device, 32 ... Data input / output device, 34 ... Data processing device, 36 ... Transfer destination information provision processing unit , 38... Data reception processing unit, 40... Data combination processing unit, 42.

Claims (4)

A data transfer system including a data transmitter and a data receiver connected to each other via a network,
Load detecting means for detecting a communication load of the network;
A determination unit that determines a transmission data division size based on a communication load detected by the load detection unit and a time required for data transfer from a division start to a combination completion in consideration of retry ;
Dividing means for dividing the transmission data into sizes determined by the determining means;
A data transfer system comprising: A data transfer system including a data transmitter and a data receiver connected to each other via a network,
Load detecting means for detecting a communication load of the network;
A determination unit that determines a division size of transmission data based on a communication load detected by the load detection unit and a time required for data transfer from the start of division to the completion of combination;
Dividing means for dividing the transmission data into sizes determined by the determining means ,
The determining means calculates the data division size D when the time required for the transfer is minimized,

A data transfer system for determining the division size by using . Load detecting means for detecting a communication load of the network;
A determination unit that determines a transmission data division size based on a communication load detected by the load detection unit and a time required for data transfer from a division start to a combination completion in consideration of retry ;
Dividing means for dividing the transmission data into sizes determined by the determining means;
A data transmission device comprising: Load detecting means for detecting a communication load of the network;
A determination unit that determines a division size of transmission data based on a communication load detected by the load detection unit and a time required for data transfer from the start of division to the completion of combination;
Dividing means for dividing the transmission data into sizes determined by the determining means;
Equipped with a,
The determining means calculates the data division size D when the time required for the transfer is minimized,

A data transmission apparatus that determines the division size using

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