JP2747248B2 - Communication data division transmission method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for dividing and transmitting communication data, and more particularly to an on-line network system comprising a plurality of computers connected by a communication line, by dividing and transmitting communication data to another terminal apparatus. TECHNICAL FIELD The present invention relates to a communication data division transmission method and apparatus for preventing interference of communication.

[0002]

2. Description of the Related Art Conventionally, when communication data is transmitted from a host computer to a plurality of terminal devices existing under the same communication line, an application program on the host computer sends a transmission / reception request to the line control device with an arbitrary communication data length. Had gone. However, there are various types of terminal devices, and the maximum communication message data length that can be transmitted and received at one time differs depending on the type, application, and purpose of the terminal device. Therefore, the line control device divides the communication data to be transmitted into units of the maximum communication data length for each terminal device and transmits the data.

At this time, if at least one terminal processing device such as an output-only terminal device, in which communication data transmitted from a host computer is always long, exists in a terminal device under the same communication line, the communication is not performed. Until the data has been output, the service efficiency to other terminal devices decreases.

FIG. 6 is a flowchart showing an operation in a conventional communication data transmission.

[0005] This is a diagram illustrating a case where long communication data and short communication data are mixed and transmitted to a plurality of terminal devices under the same communication line by a conventional method. Communication data A70, communication data B80, communication data C90
Occur simultaneously in the host computer and send each to a different terminal device. Communication data A7 addressed to terminal device A63
0, communication data B80 addressed to terminal device B64, terminal device C
The communication data C90 addressed to 65 is transmitted. These communication data are transferred from the application program 10 of the host computer 1 to the line controller 12. The line controller 12 adjusts the passed communication data to the maximum transmission data length, and the communication data A70 is divided into blocks A11 and A1.
2, the communication data B is divided into block B11 and block B, in block A13, block A14, and block A15.
12, the communication data C includes a block C11 and a block C1.
Divided into two. When communication data is simultaneously generated in a plurality of terminal devices 30 under the same line, and the line control device 12 is divided into blocks with the maximum transmission data length,
The transmission is performed in block units in the order in which the terminal devices 30 are arranged on the communication line 2. That is, terminal device A63 → terminal device B6
4 → Terminal device C65 → Terminal device A63 → Terminal device B64
→ The terminal device C65 performs transmission in block units in this order. Accordingly, the order in which the blocks enter the communication line 2 is block A11, block B11, block C11, block A12, block B12, block C12, block A13, block A14, and block A15. The time when the blocks B11 and B12 constituting the communication data B80 reach the terminal device B64 depends on the total length of the blocks A11 and A12. Similarly, the time when the blocks C11 and C12 constituting the communication data C90 reach the terminal device C65 depends on the total sum of the lengths of the blocks A11, A12, B11 and B12. That is, the communication data arrival time of the terminal devices B64 and C65 depends on the length of the maximum transmission data length set for the purpose of improving the communication line use efficiency.

[0006]

In the conventional communication data division transmission method described above, in FIG.
Is a printer such as an output-only terminal device, and the terminal device B6
When the communication data transmitted to the terminal device A63 is always long when the terminal 4 and the terminal device C65 are an online input / output terminal device that is always operated by the operator, the communication data is transmitted from the host computer to the terminal device B64 or the terminal device C65. The communication data always receives the interference of the communication data transmitted to the terminal device A63. The larger the maximum transmission data length when transmitting to the terminal device A63, the higher the transmission efficiency to the terminal device A63, but the lower the transmission efficiency to other terminal devices. If a plurality of output-only terminal devices are under the same communication line, the interference is further increased and communication data addressed to the terminal device having a lower reception order takes a longer time to reach the terminal device. This is because if the communication data to the terminal device A63 is long and the communication data length is long, the communication line is constantly occupied by the transmission message to the terminal device A63.

The communication data to the terminal device A63, which is an output-only terminal device, is transmitted to the terminal device B64 and the terminal device C65.
As long as the communication data is short, the communication data does not always exist on the communication line, and the users of the terminal devices B64 and C65 do not feel a delay in the response time. Therefore, setting the shortest maximum transmission data length to the terminal device A63 has been a conventional solution. However, in this method, a large amount of short communication data exists on the communication line and the terminal device B64 or the terminal device C
Even when the communication line 65 is not used, the communication line is in a congested state, and the communication data reception time of the terminal device A63 is delayed even if only the terminal device A63 uses the communication line. .

[0008]

SUMMARY OF THE INVENTION A communication data division transmitting apparatus according to the present invention is a terminal device connected to a host computer via a communication line in an online network system comprising a plurality of computers connected via a communication line. Terminal device type information storage means for storing information in advance, communication line use state storage means for storing communication line use state information as to whether or not there is transmission to another terminal device under the communication line; Communication data means for reading terminal device information to determine whether to divide communication data and reading the communication line use state information to determine whether to divide communication data; and According to the terminal device information, different terminal devices existing under the same communication line as the terminal device from the host computer at the same time. It is configured to include a communication data dividing transmission means for transmitting by dividing in advance in the memory length to the terminal device information when transmitting the communication data to.

[0009]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a communication data division transmission method and apparatus according to the present invention.

As shown in FIG. 1, a communication data division transmission method and apparatus according to the present embodiment are configured as follows.
A terminal device group 3 including a terminal device A31, a terminal device B32, a terminal device C33, and a terminal device D34, and a communication line 2
Connected through. The host computer 1 has a communication data division transmitting device 11 for dividing and transmitting communication data generated from the application program 10 and a line control device 12 for interfacing with the communication line 2.

[0012] The communication data division transmission device 11 transmits a terminal device type information storage device 111 in which information of a terminal device type to be transmitted, a communication data division start length, and communication data division length is stored in advance, and a communication line use state storage device 110 Then, the communication status of all terminal devices under the communication line to which the transmitting terminal device belongs is read, and if any one device is communicating, the terminal device type and communication data division are then performed from the terminal device type information storage device 111. A communication data inspection device that reads a start length and a communication data division length, checks whether a transmitting terminal device matches the read terminal device type, and, if so, compares communication data to be transmitted with the communication data division start length. 112 and the communication data inspection device 112 divides the communication data by the communication data division length read from the terminal device type information storage device 111. It is composed of a divided transmission unit 113 for transmitting to the line control unit 12.

Next, the operation of the present invention will be described. The terminal device B32 of the terminal device group 3 from the host computer 1
To send the communication data. When the destination terminal device name to be transmitted is determined, the application program 10 of the host computer 1 transmits the corresponding terminal device information of the communication line information existing in the communication line use state storage device 110 prepared by the communication data division transmitting device 11. The presence / absence item is transited to “transmission”. Application program 10
However, when all the processes are completed, the communication data is transferred to the communication data division transmitting device 11. The communication data inspection device 112 first reads the terminal device type information storage device 111. In the terminal device type information storage device 111, terminal type information is stored in advance in a format shown in a conceptual diagram showing the storage state of the terminal device type information storage device in the communication data division transmitting device of the present embodiment in FIG. Communication data inspection device 1
Reference numeral 12 indicates that if the terminal device type of the read terminal device information and the terminal device to be transmitted match, the subsequent process is continued as a target of the split transmission determination process. It is determined that there is no such request, and the processing as the communication data division transmitting device 11 ends. If they match, the communication data inspection device 112 reads communication line information from the communication use state storage device 110 next. The communication line use state storage device 110 is a conceptual diagram showing the storage state of the communication line use state storage device in the communication data division transmission device of the present embodiment of FIG. If there is a device transmission presence / absence item for every terminal and if any of the terminal devices in the communication line information has "transmission", transmission to the corresponding terminal may be divided transmission. However, if the corresponding terminal device transmission status is “no transmission”, the communication data is delivered to the line control device, and the role as the communication data division transmission device 11 ends. Communication data inspection device 11
2 is a terminal device type information storage device 11 which has already been read
The communication data division start length of the terminal device information matching the transmission destination terminal device is compared with the communication data to be transmitted in the terminal device information of the first terminal device, and if the communication data is larger than the communication data division start message length, Then, the communication data division length of the read terminal device information is transferred to the division transmission device 113. The division transmission device 113 divides communication data into communication data division lengths, and sequentially sends transmission requests to the line control device 12. Since it is in the “transmitted” state, the communication data inspection device 112 changes the “transmitted” state of the terminal device under the corresponding communication line to the “transmitted” state to the “not transmitted” state. Thereafter, the line control device 12 sequentially transmits communication data to the terminal device group 3 via the communication line 2. If the terminal device information is not stored in the terminal device type information storage device 111 in advance, the communication data inspection device 112 transmits the terminal device information to the line control device 12 as it is out of the division transmission target.

FIG. 4 is a flowchart showing an example of the operation in the communication data division transmission method and apparatus of the present embodiment. Since the communication data 20 generated by the application program 10 is longer than the communication data division start length 21 indicated by the terminal device information by the communication data division transmission device 11, the communication data 20 is adjusted to the length of the communication data division length 22. Block A, block B, block C, block D, block E,..., And finally block Z having a data length shorter than the communication data division length at the end of the communication data.
Is divided as follows. The line controller 12 requests transmission of the divided blocks in the order of block A, block B, block C, block D, block E,..., And block Z.

FIG. 5 is a flowchart showing an example of the operation of the communication data division transmission method and apparatus of the present embodiment applied in a conventional environment. With reference to FIG. 5 of the present invention, a case where communication is performed under the same environment as in FIG. 6, which is a flowchart showing the operation in the conventional communication data transmission, will be described. Since the communication data A passed from the application program 10 to the communication data division transmission device 11 has a communication data length longer than the communication data division start length, the communication data A is subject to division transmission.
Blocks A11 to A2 that are divided according to the length of the communication data division length and have the same length as the communication data division length
4, a block A25 having a short data length less than the communication data division length occurs. Since the communication data division length is much smaller than the maximum transmission data length corresponding to the communication data A in FIG. 6, the communication data A 70 is divided into small-length blocks and passed to the line controller 12. At this time, as shown in FIG. 6, when the communication data A 70, the communication data B 80, and the communication data C 90 arrive at the line controller 12 at the same time, the transmission is performed in block units in the order in which the terminal devices 30 are arranged on the communication line 2. The order in which the blocks enter the communication line 2 is block A11, block B11, block C11,
Block A12, block B12, block C12, block A13,..., Block A25. At this time,
Since each block into which the communication data A70 is divided is already smaller than the maximum transmission data length, transmission is performed at that length. The time required for the communication data B80 to reach the terminal device B64 is block A11, block B11, block C
11 and the length of block A12. At this time, the block A11 and the block A12 in FIG.
Since the blocks A11 and A12 are much smaller, the communication data B reaches the terminal device B64 earlier in FIG. 5 than in the state in FIG. The same applies to the communication data C65.

[0016]

As described above, according to the communication data division transmission method and apparatus of the present invention, the communication data can be simultaneously transmitted from the host computer to the terminal device used by the operator and the output-only terminal device. Even if it occurs, the transmission of communication data to the terminal device used by the operator is not affected by the communication data transmitted to the output-only terminal device, so the processing speed of the terminal device used by the operator is improved. Can be measured.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a communication data division transmission method and apparatus according to the present invention.

FIG. 2 is a conceptual diagram showing a storage state of a terminal device type information storage device in the communication data division transmitting device of the embodiment.

FIG. 3 is a conceptual diagram showing a storage state of a communication line use state storage device in the communication data division transmission device of the present embodiment.

FIG. 4 is a flowchart illustrating an example of an operation in the communication data division transmission method and apparatus according to the embodiment;

FIG. 5 is a flowchart illustrating an example of an operation applied in a conventional environment in the communication data division transmission method and apparatus according to the embodiment;

FIG. 6 is a flowchart showing an operation in a conventional communication data transmission.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Host computer 2 Communication line 3 Terminal device group 10 Application program 11 Communication data division transmission device 12 Line control device 30 Terminal device 31, 63 Terminal device A 32, 64 Terminal device B 33, 65 Terminal device C 34 Terminal device D 110 Communication Line usage status storage device 111 Terminal device type status storage device 112 Communication data inspection device 113 Divided transmission device

Claims (2)

(57) [Claims] In a communication data division transmitting apparatus in an online network system comprising a plurality of computers connected by a communication line, it is determined whether or not communication data of a terminal device connected to a host computer is divided by the communication line. Terminal device type, communication data division start length, and terminal device type information storage means for storing terminal device information of the communication data division length in advance, and communication data to other terminal devices under the communication line. Communication line use state storage means for storing communication line use state information storing communication state of all terminal devices under the communication wiring to which the transmitting terminal device belongs, for determining whether or not the terminal device is to be divided Read the terminal device information to determine whether to divide communication data and read the communication line use state information. Communication data means for determining whether or not to divide the embedded communication data into transmission targets, and comparing the communication data with the communication data division start length present in the terminal device information, and the communication data is larger. Only in the case of the subject of split transmission, at the same time when transmitting communication data from the host computer to a different terminal device existing under the same communication line as the terminal device, divided into lengths previously stored in the terminal device information And a communication data division transmitting unit for transmitting the data. 2. A terminal device for determining whether to divide communication data of a terminal device connected to a host computer via a communication line, a communication data division start length, and a communication data division length terminal device. All the terminals under the communication line to which the transmitting terminal device belongs for storing information in advance and determining whether to divide communication data to other terminal devices under the communication line. By storing the communication line use state information that stores the communication state of the device, it is determined whether to divide communication data from the terminal device information, and the communication data is divided and transmitted from the communication line use state information. In order to determine whether or not to perform the communication, the communication data is compared with the communication data division start length existing in the terminal device information, and only when the communication data is larger, When transmitting communication data from the host computer to different terminal devices existing under the same communication line as the terminal device at the same time as the target of the split transmission, the communication data is divided into lengths stored in advance in the terminal device information and transmitted. Communication data division transmission method.