JP2870055B2 - Data communication method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a data communication system.
The present invention relates to a data communication system for disassembling data and transferring the data over a plurality of lines.

(Prior art) Conventionally, data transfer via a communication line is performed through a series of phases of connection of a line, establishment of a data link, transfer of data, release of a data link, and disconnection of a line between a transmitting side and a receiving side. Complete the data transfer.

As an example, as shown in FIG. 4, for example, data f is transmitted from a terminal (referred to as a communication terminal) U3 having a communication function via a communication line SC, a communication line network N, and a communication line rw, and received by a communication terminal R1. . FIG. 4 shows the received data as f '. The data f and f 'are the same.

The packet switching system conforming to international standards and recommendations by ISO and CCITT realizes data transfer by data disassembly / assembly (PAD) processing.

(Problems to be Solved by the Invention) However, in the non-packet method, the communication line and the communication terminal are occupied for data transfer until the communication line is established and the data transfer ends. Therefore, there is a problem that the occupancy of the communication line and the communication terminal increases when the transfer data amount increases.

Furthermore, in the case of a communication method in which data transfer is realized by decomposing the transfer data and selecting a communication line to be used every time the separated data is transferred and recording a series of history records, securing the communication line is irregular. And there is a problem that time is lost.

On the other hand, in the packet method, after packetizing data,
Since the communication line is appropriately selected and transferred, the occupation ratio of the communication line is lower than that of the non-packet system, but there is a problem that a capacity loss occurs due to the addition of header information to the data area for each packet. .

The present invention solves the above-mentioned problems by disassembling data and transferring the data over a plurality of communication lines, saves time for data transfer, and adds header information defined by a packet method per packet. It is an object of the present invention to provide an overall data saving method for reducing the capacity loss, batch processing of transfer by setting and reservation of a communication line at the time of transfer, and an effective data communication method in an existing communication line environment.

(Means for Solving the Problems) A data communication system according to the present invention is a data communication system in which a data division / combination terminal is interposed between a communication terminal and a communication network to transfer data. The data division / synthesis terminal is provided with a communication line selecting means for securing or reserving a plurality of usable communication lines in response to the transfer data capacity information, and at least the call number information of the secured or reserved communication line, the transfer data capacity and Transfer procedure control information generating means for generating one transfer procedure control information common to the transfer data including the name of the receiving terminal based on the information of the name, and transfer data in accordance with the transfer procedure associated with the generated transfer procedure control information And a transmitting means for transmitting the transfer procedure control information and the decomposed decomposed data to the reserved or reserved communication line. Identification means for identifying transfer procedure control information and decomposed data from data transmitted from the communication line; and data synthesis means for synthesizing the decomposed data identified by the identification means based on the transfer procedure control information identified by the identification means And transmission means for transmitting the synthesized data to the communication terminal.

(Operation) When transferring data, the transfer data is decomposed according to the transfer procedure associated with the transfer procedure control information generated by the transfer procedure control information generating means, and the transfer procedure control information and the decomposed data are separated by the communication line selecting means. Is transmitted by a transmission procedure through a plurality of communication lines secured or reserved in advance.

Further, the transmitted data is identified by the identification means into transfer procedure control information and decomposed data, and the decomposed data is synthesized into data by the data synthesizing means based on the identified transfer procedure control information, and the synthesized data is It is sent to the communication terminal by the sending means.

(Examples) Hereinafter, the present invention will be described with reference to examples.

 FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 1 shows a data file disassembly / synthesis terminal which is connected between a communication terminal and a communication line network and has a function of decomposing and synthesizing a data file, and is hereinafter referred to as FCD.

FCD The interface T ₁ of the communication terminal, the interface L ₁ of the communication line, and an output section S ₁ to output the received data file sent from the communication terminal via the interface T _1, the output section S ₁ a communication line selector S ₂ for the securing or reservation of the output data file a plurality of communication lines available by receiving capacity information via the at least secured or reserved call number of the communication line for the transfer, a transfer procedure data file generating unit S ₃ which generates a transfer procedure data file based on capacity and name information of decomposed data file, a data file output from the output unit S ₁ to transfer the plurality of communication lines decomposed into a plurality in accordance with the generated transfer procedure data file decomposing section S ₄
If, separated data transmission unit S ₅ for transmitting separation data files and transfer procedure data file to a secure or reserved communication line by the communication line selector S ₂ via the interface L _1, from the communication line via the interface L ₁ a receiving unit V ₁ which receives the file and transfer procedure data file, and identifying means V ₂ identifies the the separation data files and transfer procedure data files from within the received data at the receiving unit V _1, identified by the identifying means V ₂ a file synthetic procedures decryption unit V ₃ to decipher the procedure of combined reception separation data file based on the information transfer procedure data file that is to synthesize the received separated data files along with the output from the synthesis procedure decryption unit V ₃ It provided with a data file combining unit V _4, and a working memory M required for the series of operations.

In FIG. 1, the solid line indicates the flow of processing when transmitting a data file, and the broken line indicates the flow of processing when receiving a data file. Further, a dashed line indicates a flow when the FCD is bypassed.

First, the operation of the FCD configured as described above will be described for the case of transmission.

Capacity of the communication terminal transfers the data file to the interface T ₁ has been transmitted through the, information such as the name output section S ₁
Sent from the communication line selector S ₂ receives, usable communication line is secured retrieved by the communication line selector S _2. If there is no usable communication line, a communication line to be used is set (hereinafter referred to as reservation setting).

Following the reservation or reservation setting of the communication line to be used, the transfer procedure data file is generated based on information such as the capacity and name of the transfer data file, the call number of the reserved / reserved communication line, and the name of the disassembly data file. Generated by ₃ . The generated transfer procedure data file is temporarily stored in the working memory M.

On the other hand, the transfer data files are sequentially stored in the working memory M from the output section S _1, the transfer data files from the working memory M according to the procedure according to the generated transfer procedure data is read in the data file decomposing section S ₄ , And is stored in the working memory M. In this specification, each of the decomposed data files is referred to as a decomposed data file.

After the transfer data file is disassembled, the disassembly data file and the transfer procedure data file are read from the working memory M. Is read separation data files and transfer procedure data file, the interface L ₁ from the transmitter S ₅
The via, is transmitted using a transportable communication lines secured or reserved by the communication line selector S ₂ to the specified forwarding communication terminal. In this case, the transmission of the transfer procedure data file may be immediately before or immediately after the transfer of the disassembly data file.

 Next, the case of receiving the action of the FCD will be described.

File received through the interface L ₁ of the line side reception unit V ₁ was, is input to the file identification unit V _2, or transfer procedure data file or separation data file is identified. Identified transfer procedure data file file synthetic procedures from the transfer procedure is entered in the file synthetic procedures decryption unit V ₃ is decoded. Meanwhile transfer procedure file data and separation data files via the file identification unit V ₂ is stored in the working memory M, separated data file stored in the working memory M according to the decrypted file synthetic procedure sequential data file synthesis is synthesized in part V _4, combined data file are sequentially stored in the working memory M.
Synthetic data file synthesis is completed the separation data file is read out from the working memory M, it is sent via the interface T ₁ to the communication terminal designated from the input unit V _5.

By the way, it is also possible to bypass the FCD and to use a conventional route by a communication terminal-communication line direct connection route and a communication line-communication terminal direct connection route indicated by a chain line in FIG.

Next, FIG. 2 shows a specific example in which the above-mentioned FCD is connected to a communication line and a communication line network.

The specific examples shown in FIG. 2 are communication terminals (U1, U2, U3), (R
1, R2, R3, R4) and communication line network N, and communication line (s
a, sb, sc) and (rw, rx, ry, rz). FCD is the terminal interface T
₁ by concentrates the communication terminal is connected to the communication line by the communication line side interface L _1.

As an example of file transfer, communication terminal U3 to communication terminal R1
The following shows the procedure for transferring a data file to the server. In addition,
Transmission data file f and reception data file f 'in FIG.
Is a file with exactly the same content.

Using more communication terminals U3, the output unit S ₁ via the interface T ₁ of the terminal, the file name and volume information such as a desired transfer, received by the communication line selector S _2, the communication line selector S ₂ A possible line is searched and secured. Also,
If there is no line to be used, the line to be used is set.

In the example shown in FIG. 2, the transmission-side line (sa, sb, sc) and the reception-side line (rx, ry, rz) are reserved or are to be used.

Then, the transfer procedure data file generating unit S _3, the file name and capacity received from the output unit S _1, and secured /
Transfer procedure data is generated based on information such as a reservation setting line.

FIG. 3 shows a configuration example of the transfer procedure data. In the figure,
(0) is a field format, (1) is a transfer procedure data file generated according to (0), a transfer data file f is decomposed into three decomposed data files (d1, d2, d3), and d1 is a line ( sc−rz), d2 is the line (sb−
ry) indicates that d3 is transferred from the line (sa-rx) to the destination terminal R1. Ings “n” indicates the data length of the decomposed data file “n”, and date “n” indicates the creation date of the decomposed data file “n”.

Input from the input unit S ₁ the transferred data file is stored in the working memory M, based on the transfer procedure data file is read from the work memory M if necessary, separated data file (dn) is generated Are stored in the working memory M.

According transfer procedure data then decomposed data file by lines that are secured, via the transmission section S _5, the interface L ₁ of the line side, it is transmitted to the specified terminal R1. Also, when a reserved line becomes available, the line is similarly secured and transmitted.

Note that the transfer procedure data file does not need to be transmitted at a specific timing such as immediately before or immediately after the disassembly file transfer, and the transmission timing is not particularly limited.

In FIG. 2, as indicated by the transfer procedure data in FIG. 3, the disassembly data file d1 is a line (sc-rz), the disassembly data file d2 is a line (sb-ry), and a disassembly data file.
d3 is the line (sa-rx) and the transfer procedure data file
The JF is transmitted from the line (sa-rx) to the FCD on the receiving side.

Then, when the receiving side, the file received from the receiving unit V1 via the interface L ₁ of the line side,
It identified by identifying the file identification means V ₂ or transfer procedure data file (JF) or separation data file (dn). Transfer procedure The data file (JF) and the data file (dn) may be identified by the sender and the receiver in advance, or may be identified by a number of methods using file identifiers and identification information. However, there is no limitation on the identifier and the identification information.

The decomposition data file (d1, d
2, d3) and the transfer procedure data file (JF) are stored in the working memory M, and the transfer procedure data file (JF)
Upon receiving a decrypted by the file synthetic procedures decryption unit V _3, the data file combining unit V _4, separated data file (d1, d2, d3) is synthesized.

File f 'synthesized by the synthesis becomes a transferred data file f equivalent, from the input unit V ₅ through the interface T _1, is input to the specified terminal.

Note that the format of the transfer procedure data file shown in FIG. 3 and the series of explanations is an example, and the present invention is not limited to components and formats such as the contents, order, and types of fields.

(Effects of the Invention) As described above, according to the present invention, the transfer of data is performed by decomposing the transfer data into an arbitrary size and transmitting the decomposed data and the transfer procedure control information to a predetermined communication terminal using a plurality of communication lines. Since the data is transmitted, the data can be divided and transferred using the existing communication network without using any special communication means such as a packet switching system. Further, since the disassembled data is transferred through a plurality of secured communication lines or reserved communication lines, the communication time can be reduced.

Further, since the transfer procedure control information is generated, the transfer data is decomposed according to the transfer procedure control information, and the transfer procedure control information is transmitted together with the decomposed data, the decomposed data can be synthesized based on the transfer procedure control information.

Further, according to the data communication method of the present invention, according to the transfer procedure according to the transfer procedure control information, the transfer data is decomposed and the decomposed data is transmitted, thereby avoiding an increase in the occupancy rate of the line and terminal by the non-packet method. Thus, it is possible to transmit a large amount of data while avoiding a capacity loss due to the packet method.

Still further, according to the data communication method of the present invention, the transfer procedure control information is identified from the data sent from the communication line, and the decomposed data is synthesized based on the identified transfer procedure control information. Since only the file name needs to be given to the header attached to each actual data, the effect of suppressing an increase in the total data amount even when the data is sent through a plurality of communication lines can be obtained. . There is also an effect that the data length of the decomposed data can be made different.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention. FIG. 2 is a block diagram showing a specific example in which an FCD according to one embodiment of the present invention is connected to a communication line and a communication line network. FIG. 3 is a schematic diagram showing a format of a transfer procedure data file in one embodiment of the present invention. FIG. 4 is a block diagram showing an example of a conventional data transfer system. T ₁ and L ₁ ... interface, S ₁ ... output section, S ₂ ...
Communication line selection unit, S ₃ …… Transfer procedure data file generation unit, S ₄ …… Data file decomposition unit, S ₅ …… Transmission unit, V ₁ …
… Reception unit, V ₂ …… File identification unit, V ₃ …… File synthesis procedure decoding unit, V ₄ …… Data file synthesis unit, V ₅ …… Input unit, M …… Work memory, FCD …… Data file Disassembly / synthesis terminal, U1-U3 and R1-R4 …… Communication terminal,
N: communication line network, sa, sb, sc, rw, rx, ry, yz: communication line, d1 to d3: disassembly data file, JF: transfer procedure data file.

Continuation of front page (56) References JP-A-3-89547 (JP, A) JP-A-62-10048 (JP, A) JP-A-62-16642 (JP, A) (58) Fields investigated (Int .Cl. ⁶ , DB name) H04L 29/00-29/12 G06F 12/00

Claims (1)

(57) [Claims] 1. A data communication system for transferring data by interposing a data division / combination terminal between a communication terminal and a communication line network, wherein said data division / combination terminal comprises: Communication line selecting means for securing or reserving a plurality of communication lines that can be used in response to the request, at least call number information of the secured or reserved communication line,
Transfer procedure control information generating means for generating one transfer procedure control information common to the transfer data including the name of the receiving terminal based on the information on the capacity and name of the transfer data; and transfer according to the generated transfer procedure control information Data decomposing means for decomposing transfer data in accordance with a procedure; transmission means for transmitting transfer procedure control information and decomposed decomposed data to a reserved or reserved communication line; transfer procedure control from data transmitted from the communication line Identification means for identifying information and decomposed data; data synthesizing means for synthesizing the decomposed data identified by the identification means based on the transfer procedure control information identified by the identification means; and sending the synthesized data to the communication terminal Means, and a data communication method comprising: