JP2671760B2 - Data communication method and data communication system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data communication system and a data communication system, and more particularly to a data communication system for transmitting and receiving data while confirming delivery of data between communication devices connected to each other via a communication medium. And a data communication system.

[0002]

2. Description of the Related Art Conventionally, data transmission is performed in a data communication system that performs data communication while confirming delivery of data between communication devices (end-to-end) connected to each other via this type of communication medium. A data confirmation protocol data unit (hereinafter, A) on the receiving side for a data protocol data unit (hereinafter, DT-PDU)
The transmission of (K-PDU) generally occurs at an arbitrary timing on the receiving side.

[0003]

However, in the above-described conventional data communication system, since the timing of transmitting the AK-PDU is arbitrary on the receiving side, the DT-PDU is meaningless due to the difference in recognition from the transmitting side. However, there are drawbacks such as a decrease in communication efficiency due to the resending of and a disconnection of the connection in the worst case.

The present invention has been made in order to solve such a conventional problem, and it is possible to completely eliminate the difference in recognition regarding the timing of data confirmation, and it is meaningless to retransmit a DT-PDU to improve communication efficiency. Decrease and DT-P
An object of the present invention is to provide a data communication system and a data communication system capable of avoiding disconnection due to excess number of DU retransmissions.

[0005]

In order to achieve the above object, the present invention is a data communication system for performing data communication while confirming delivery of data between data communication devices connectable to each other via a communication medium. A designating means for designating a transmission timing of the data confirmation protocol on the receiving side, a creating means for creating a data protocol including the designated transmission timing by the designating means, and a data transmission created by the creating means. And a transmitting means for transmitting the data protocol to be performed.

Further, a data communication system for performing data communication while confirming delivery of data between data communication devices connectable to each other via a communication medium, a receiving means for receiving a data protocol for transmitting data, When the data protocol for transmitting data received by the receiving means includes the transmission timing of the data confirmation protocol, the holding means for holding the transmission timing of the data confirmation protocol, and the data confirmation protocol according to the holding timing of the holding means And a confirmation transmitting unit for generating and transmitting.

Furthermore, in a data communication system for performing data communication while confirming delivery of data between data communication devices that can be connected to each other via a communication medium, the data communication protocol of the reception side is transmitted to the transmission side device. A designating means for designating timing, a creating means for creating a data protocol for performing data transmission including a designated transmission timing by the designating means, and a sending means for sending the data protocol for creating data created by the creating means. And a receiving device that receives a data protocol for data transmission, and a data confirmation protocol transmission timing when the data protocol for data transmission received by the receiving device includes a data confirmation protocol transmission timing. The holding means for holding the timing and the data according to the holding timing of the holding means And a confirmation transmission means to create and send confirmation protocol. Then, for example, when the data confirmation protocol from the partner communication device is not sent within a predetermined time after the data protocol for transmitting data is transmitted by the transmitting unit, the creating unit is configured to respond to the data protocol for transmitting data. A data protocol for data transmission is created by changing the transmission timing of the data confirmation protocol on the reception side so that the data confirmation protocol on the reception side is transmitted every time a data protocol for data transmission is transmitted.

Alternatively, the reception result of the data protocol for transmitting the data is compared by comparing the number of receptions of the data protocol for transmitting the data received by the receiving means with the transmission timing value of the data confirmation protocol held by the holding means. And a determination means for determining.

Further, for example, when the discriminating means discriminates that the number of receptions of the data protocol for data transmission and the received transmission timing value coincide with each other, the confirmation transmitting means creates and transmits the data confirmation protocol.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described below in detail with reference to the drawings. First, the principle of the present invention will be described. A first invention is a central processing unit that is connected to a partner data communication system via a communication line and has an application program unit and a data communication program unit that performs data communication while confirming delivery of data between the end and end. In a data communication system including a communication control device that transmits data to a communication line according to an instruction from the data communication program unit and notifies the data communication program unit of the data received from the communication line, during data transmission,
The application program section is a DT that transmits data
-The transmission timing of the AK-PDU on the receiving side for the PDU is determined, and the data communication program unit receives the transmission request block in which the AK-PDU transmission timing is issued issued from the application unit, and the AK-PDU transmission timing is set. DT-PDU is created and the DT-PDU is created.
A DT-PDU retransmission timer is registered when transmitting a PDU, and the DT-PDU is retransmitted before the timer times out.
AK-P according to the transmission request timing for notifying the confirmation of
When the DU is received, the DT-PDU transmission step 1 which completes the transmission, and in the DT-PDU transmission step 1, when the DT-PDU retransmission timer times out, the AK-PDU transmission timing in the data communication program section. D for each DT-PDU is created, and the communication control device is caused to transmit the DT-PDU.
T-PDU transmission step 2 and the data communication program unit at the time of data reception receives the DT-PD at the time of DT-PDU reception.
AK-PDU transmission request timing set to U is taken out, the timing is held and the number of DT-PDU receptions is added, and when the number of DT-PDU receptions has not reached the timing, the DT-PDU is completed. In the receiving step 1 and the DT-PDU receiving step 1, DT-
When the number of received PDUs matches the held AK-PDU transmission timing, an AK-PDU is created and AK-PD is created.
DT that transmits U and clears the number of received DT-PDUs
-A PDU reception step 2 is included.

A second invention is a central computer which is connected to a partner data communication system through a communication line and has an application program section and a data communication program section for performing data communication while confirming delivery of data between end-to-end. A data communication transmission system comprising a processing device and a communication control device for transmitting data to a communication line according to an instruction from the data communication program unit and notifying the data received from the communication line to the data communication program unit, wherein the application program The section includes data transmission request means for issuing a data transmission request to the data communication program section by a transmission request block having an AK-PDU transmission timing request area for requesting the AK-PDU transmission timing of the receiving side for the DT-PDU. , The data communication program section A request receiving means for receiving data transmission instruction from the application program unit, according to an instruction from the request receiving means to create a DT-PDU DT-
According to the value of the AK-PDU transmission timing request area in the transmission request block notified from the application program section according to an instruction from the PDU creating means and the DT-PDU creating means, the AK-P is transmitted to the partner data receiving system.
An AK-PDU request part creating means for setting an AK-PDU send request timing area of a DT-PDU header part for notifying the DU send timing, and a DT-PDU to the communication control device according to an instruction from the DT-PDU creating means. DT-PDU transmitting means for requesting the transmission of the AK-PDU, AK-PDU receiving means for processing the AK-PDU notified from the communication control device and outputting the reception of the AK-PDU, and a retransmission interval of the DT-PDU is set. A DT-PDU retransmission timer that starts timing by a transmission notification from the PDU transmission means and stops timing by a notification from the AK-PDU reception means,
When the timer times out, the DT-PDU creation means is required to create a DT-PDU in which AK-PDU transmission timing is set for each DT-PDU reception.
It is characterized in that it includes PDU retransmitting means.

A third invention is a central processing unit which is connected to a partner data communication system through a communication line and has a data communication program section which performs data communication while at least confirming delivery of data between end-to-end. A data communication receiving unit including a communication control device that transmits data to a communication line according to an instruction from the data communication program unit and notifies the data communication program unit of the data received from the communication line. A DT-PDU receiving unit which receives a DT-PDU notified from the communication control device and outputs an AK-PDU transmission request timing set in the DT-PDU;
The transmission timing of the AK-PDU is output according to the notification from the U reception means, and the transmission timing of the AK-PDU is determined with reference to the transmission timing and the number of DT-PDUs received, and the DT-PDU is transmitted.
If the number of received data matches the transmission timing, AK-
AK-PDU control means for outputting generation of PDU, and AK
-AK-PDU holding means for holding the transmission timing of AK-PDU according to the notification from the PDU control means, and AK-
AK-PD to be transmitted by notification from PDU control means
AK-PDU creating means for creating and outputting U, and AK-PD for notifying the communication control unit of transmission of the created AK-PDU
It is characterized by including U transmission means.

The embodiments of the present invention described above will be described in detail with reference to the drawings. FIG. 1 is a diagram showing the configuration of a data communication network system of a first embodiment according to the present invention.
In FIG. 1, 10 is a data communication transmission system,
It is connected to the data communication network 300 via the communication line 60. A data communication receiving system 100 is connected to the data communication network 300 via a communication line 60.
Further, 200 and 210 are other data communication systems.
Each communication system 10, 100, 200, 210 can perform data communication with another data communication system via the data communication network 300. Note that the data communication transmission system 10 and the data communication transmission system 100 will be described below as systems for transmitting and receiving for simplification of the description, but they will be respectively received with transmission.
Needless to say, it is possible to transmit as well as receive, and it is possible to selectively perform transmission / reception at appropriate times. FIG. 2 is a diagram showing a detailed configuration of the data communication transmission system 10 shown in FIG. FIG.
In the data communication transmission system 10, the communication line 6
0, which transmits data to another communication system, for example, the data communication receiving system 100 via the data communication network 300, and includes a central processing unit 20 and a communication control device 50.

The central processing unit 20 includes an application program section 30 and a data communication program section 40. When a transmission request is generated, the application program unit 30 determines the transmission request timing of the AK-PDU according to the number of transmission requests, and the transmission request block 32 A
The data transmission request means 31 for setting the K-PDU transmission request timing area 33 and making a data transmission request to the data communication program unit 40 is included.

The data communication program section 40 includes a transmission request block 32 from the application program section 30.
Request acceptance means 41 for accepting a transmission request by the DT-PDU creation means 42 for creating a DT-PDU according to an instruction from the request acceptance means 41, and a DT-PDU creation means 4
AK-PD of the transmission request block 32 according to the instruction from 2.
AK-PDU request section creating means 43 for setting the AK-PDU transmission request timing area of the DT-PDU header section according to the U transmission request timing area 33, and DT-PDU
In accordance with an instruction from the creating means 42, the communication control device 50 is DT-
DT-PDU transmission means 44 for instructing transmission of PDU,
It has AK-PDU receiving means 45 for receiving a reception notification of AK-PDU from the communication control device 50, and DT-PDU retransmission timer 47 in which a retransmission interval of DT-PDU is set.
Timing of the timer is started by an instruction from the T-PDU transmitting means 44, and when the expected reception of the AK-PDU is notified from the AK-PDU receiving means 45 before the timer times out, the timing of the timer is stopped. If the timer times out, the DT-PDU creating means 42 is notified to the DT-PDU.
It includes a DT-PDU retransmitting unit 46 for instructing the creation of a DT-PDU in which the AK-PDU transmission request timing for each PDU reception is set.

Next, the operation of the data communication transmitting system 10 having the above configuration will be described. The data transmission requesting means 31 of the application program section 30 is activated by the generation of a transmission request from the application program,
The transmission timing of AK-PDU is determined according to the number of transmission requests. Then, the determined AK-PDU transmission timing is set in the AK-PDU transmission timing request area 33 of the transmission request block 32. Data transmission requesting means 3
1 completes this setting, the data communication program unit 4
0 is requested according to the transmission request block 32 to transmit the DT-PDU.

The request receiving means 41 of the data communication program section 40 receives the transmission request from the application program section 30 issued by the transmission request block 32. Subsequently, the DT-PDU creating means 42 creates a DT-PDU according to the transmission request block 32 according to an instruction from the request receiving means 41. Then, the AK-PDU request part creating means 43 sets the value of the AK-PDU transmission timing set in the AK-PDU transmission timing request area 33 of the transmission request block 32 according to the instruction from the DT-PDU creating means 42 to the DT-PDU. Header part of AK-PDU
Set it in the transmission request area.

The DT-PDU transmission means 44 uses the DT-PD.
In response to an instruction from the U creating means 42, D
Request transmission of T-PDU. The communication control device 50 uses the DT-PD for which the AK-PDU transmission timing is set.
U is transmitted to the data communication receiving system 100 shown in FIG. 1, for example, via the communication line 60. Further, the AK-PDU transmission request DT-PDU retransmitting means 46 starts the DT-PDU retransmitting timer 47 to count the time according to the instruction from the DT-PDU transmitting means 44. Then, the DT-PDU retransmission means 46
It is monitored whether the T-PDU retransmission timer 47 has timed out. The AK-PDU receiving means 45 determines whether or not there is an AK-PDU reception notification from the communication control device 50. The DT-PDU retransmitting means 46 receives the AK-PDU reception notification from the AK-PDU receiving means 45, and receives the DT-PD.
The timing of the U retransmission timer 47 is stopped, and the transmission of DT-PDU is completed.

On the other hand, the DT-PDU retransmitting unit 45 uses the AK
-If there is no AK-PDU reception notification from the PDU receiving means 45 and the DT-PDU retransmission timer 47 times out, the DT-PDU requesting the DT-PDU creating means 42 for the AK-PDU transmission timing for each DT-PDU. Instruct the creation of. As a result, the DT-PDU transmission means 4
4 requests the communication control device 50 to transmit a DT-PDU requesting an AK-PDU transmission timing for each DT-PDU in response to an instruction from the DT-PDU creating means 42. The communication control device 50 retransmits the DT-PDU for which the AK-PDU transmission timing is set to the data communication receiving system 100 via the communication line 60.

Next, the DT- sent as described above.
A data communication receiving system 100 that receives a PDU will be described. FIG. 3 is a block diagram showing the configuration of the data communication receiving system of this embodiment shown in FIG. First, the configuration will be described with reference to FIG. Data communication receiving system 11
0 receives data from, for example, the above-described data communication transmission system 10 via the communication line 60 and the data communication network 300, and performs the processing described later. The data communication receiving system 100 is composed of a central processing unit 120 and a communication control device 140.

The central processing unit 120 includes a data communication program section 130. Data communication program section 1
Reference numeral 30 denotes a DT-PDU receiving unit 13 that receives a DT-PDU from the transmission side notified from the communication control device 140.
1 and the AK-PDU transmission request timing set in the DT-PDU received by the notification from the DT-PDU receiving means 131 is taken out and the AK-PDU transmission request timing holding means 133 is instructed to hold the timing, and the DT
-Counting the number of received PDUs, referring to the transmission request timing of the AK-PDU held in the AK-PDU transmission request timing holding means 133, if the number of received reaches the transmission request timing of the AK-PDU, AK -AK-PDU control means 132 for instructing the creation of a PDU, and AK-P
An AK-PDU transmission request timing holding unit 133 that holds an AK-PDU transmission request timing according to an instruction from the DU control unit 132, and an AK-PDU that creates an AK-PDU according to an instruction from the AK-PDU control unit 132.
It includes a creating unit 134 and an AK-PDU sending unit 135 that gives an instruction to send the AK-PDU to the communication control device 140 according to an instruction from the AK-PDU creating unit 134.

Next, the operation of the data communication receiving system 100 having the above configuration will be described. When a DT-PDU is sent from the transmission side system, for example, the data communication transmission system 10 via the data communication network and the communication line 60, the communication control device 140 receives it. Then, the reception of the DT-PDU is notified from the communication control device 140 to the DT-PDU receiving means 131 of the data communication program unit 130. The DT-PDU receiving unit 131 counts the number of received DT-PDUs and AKs the reception of DT-PDUs.
-Notify the PDU control means 132. The AK-PDU control means 132 receives the reception notification from the DT-PDU reception means 131 and sets the AK-set in the received DT-PDU.
The PDU transmission request timing is taken out. The AK-PDU transmission request timing holding means 133 holds this AK-PDU transmission request timing.

The AK-PDU control means 132 uses the DT-P.
It is determined whether or not the number of received DUs reaches the transmission timing of the held AK-PDU. Then, the AK-PDU control unit 132 holds the number of received DT-PDUs A
If the K-PDU transmission timing has not been reached, reception is completed.

On the other hand, when the number of received data reaches the transmission timing of the AK-PDU, it instructs the preparation of the AK-PDU.
AK-Received an instruction from the AK-PDU control means 132
The PDU creating unit 134 creates an AK-PDU according to the instruction. The AK-PDU transmitting means 135 transmits the AK-PDU created by the AK-PDU creating means 134 in accordance with an instruction from the AK-PDU creating means 134 to the communication control device 1.
40 requests. The communication control device 140 uses this AK-P
The DU is transmitted to the transmitting side, for example, the data communication transmitting system 10 via the communication line 60 and the data communication network 300. The DT-PDU receiving unit 131 receives the AK-PDU transmission instruction from the AK-PDU transmitting unit 135, and then receives the DT-PD.
Clear the number of received U.

A series of D's in this embodiment described above
T-PDU transmission / DT-PDU reception control will be described with reference to FIGS.
Will be described in more detail. First, the DT-PDU transmission control of the transmitting system will be described with reference to FIG. FIG.
As shown in FIG. 5, the DT-PDU transmission control of the transmission side system of this embodiment is performed by the DT-PDU transmission process 1 when the DT-PDU transmission is normally performed in step S100 and the DT-PDU normality in step S200. DT-PDU transmission processing 2 which is processing for retransmission when transmission is not performed
Can be roughly divided into

The transmitting side device, for example, the data communication transmitting system 10 shown in FIG. 1 first responds to the transmission request by the data transmission requesting means 31 as described above when a transmission request is generated from the application program section 30 in step S101. Determine the transmission timing of AK-PDU.
The data transmission request means 31 of the application program 30 uses the AK-PDU determined in the subsequent step S102.
AK-PD of transmission request block 32
It is set in the U transmission timing request area 33. Then, in step S103, the data transmission requesting means 31 makes the DT-PD.
Request transmission of U to the data communication program section. The request receiving means 41 of the data communication program unit 40 receives the transmission request from the application program unit 30 in step S104.

Then, in step S105, the DT-PDU is sent.
The creating means 42 uses the DT-PDU according to the transmission request block.
Create A of the data communication program unit 40
The K-PDU request section creating means 43 then proceeds to step S10.
In step 6, the value of the AK-PDU transmission timing is set in the AK-PDU transmission request area of the header portion of the DT-PDU according to the instruction from the application program unit 30.

The DT-PDU transmitting means 44 uses the step S.
At 107, the communication control device 50 is requested to transmit the DT-PDU. Further, in step S108, the DT-PDU retransmitting means 46 of the data communication program unit 40 starts the DT-PDU retransmit timer 47 to time. Then, the DT-PDU retransmitting means 46 monitors the timeout of the DT-PDU retransmitting timer in step S109, and the AK-PDU receiving means 45.
Is AK-P from the communication control unit 50 in step S110.
Monitor DU receipt notifications. The processing of steps S109 and S110 is performed by the DT-PDU retransmitting means 46.
Detects the timeout of the DT-PDU retransmission timer or the AK-PDU receiving means 45 detects the reception of the AK-PDU from the communication control device 50.

The data communication program section 40 is an AK-P.
The DU receiving means 45 sends the AK-PD from the communication control device 50.
When the reception notification of U is detected, the process proceeds from step S110 to step S111 to stop the timing of the DT-PDU retransmission timer 47 and complete the DT-PDU transmission process. Also,
When the DT-PDU retransmission timer 47 times out, the data communication program unit 40 proceeds to step S201 to execute the DT-PDU transmission processing 2, and advances to step S201.
AK-PD for each DT-PDU by the DU resending means 46
DT-PDU is created by changing the timing so that U is transmitted. Then, the process proceeds to step S105,
The transmission process of the DT-PDU newly created by changing is performed.

In this way, the data communication system on the transmission side transmits the AK-to the DT-PDU to the system on the other side.
It is possible to send a DT-PDU that specifies the transmission timing of the PDU.

Next, referring to FIG. 5, the DT of the receiving side system
-The PDU reception control will be described. As shown in FIG. 5, in the DT-PDU reception control of the receiving side system of the present embodiment, the AK-P in which the number of received DT-PDUs in step S300 is held.
DT-PDU when DU transmission timing is not reached
Reception processing 1 and DT-PDU, which is processing for AK-PDU transmission when the AK-PDU transmission timing in which the number of DT-PDU receptions in step S400 is held is reached
It can be roughly divided into reception processing 2.

In the receiving side device, for example, in the data communication receiving system 100 shown in FIG. 1, first, in step S301.
The DT-PDU is received from the communication control device 140 by the DT-PDU receiving means 131 of the data communication program unit 130.
Will be notified. DT- of the data communication program unit 130
The PDU receiving means 131 determines DT-P in step S302.
Count the number of DUs received. AK-PDU control means 1
Step 32 is step S303, in which DT-PDU is changed to AK-PD.
Take out the U transmission timing, and AK in step S304.
-PDU transmission timing holding means 133 is an AK-PDU
Hold the transmission timing. And step S305
Then, the AK-PDU control means 132 determines whether or not the AK-PDU transmission timing in which the number of received DT-PDUs is held has been reached. If the AK-PDU transmission timing has not been reached, the process proceeds to step S310 to complete the reception process.

On the other hand, the number of DT-PDUs received is AK-PD.
If the U transmission timing has been reached, the process proceeds from step S305 to step S401 to determine the creation of the AK-PDU, and instructs the AK-PDU creating means 134 to create the AK-PDU. The AK-PDU creating means 134 creates an AK-PDU in the subsequent step S402. The AK-PDU transmission means 135 transmits the AK-PDU created by the AK-PDU creation means in step S403 to the communication control device 140.
Request to. The DT-PDU receiving means 131 clears the received number of DT-PDUs according to the instruction from the AK-PDU transmitting means 135 in step S404. Then, the reception process ends.

FIG. 6 shows an actual communication control procedure in the data communication network 300 in each control described above. In the example shown in FIG. 6, for example, three transmission requests are generated on the transmission side, so that 3 is set in the AK-PDU transmission request timing area of the DT-PDU. On the receiving side, this DT-PDU
And holds 3 as the AK-PDU timing.
Therefore, on the reception side, when three DT-PDUs of 0, 1, and 2 are received, AK indicating confirmation of these DT-PDUs.
-Send the PDU.

Subsequently, three new transmissions occurred, but three
The DT-PDU of is lost. in this case,
On the receiving side, only two DT-PDUs 4, 5 are received. In this case, the number of received DT-PDUs has not reached the transmission timing 3 of AK-PDUs, so that AK-PDUs are not transmitted. Therefore, the retransmission timer on the transmitting side times out, and three DT-PDUs with the AK-PDU transmission timing set for each DT-PDU reception are transmitted. When the receiving side receives this DT-PDU, the AK-PDU transmission timing is changed every time the DT-PDU is received, and three AK-PDUs indicating confirmation of each of DT-PDUs 3, 4, and 5 are received. After that, when three new DT-PDU transmission requests are generated, the AK-PDU transmission request timing is set to 3. On the receiving side, the transmission timing of the AK-PDU is changed to 3 again when the DT-PDU of 6 is received, and the AK-PDU is transmitted when the DT-PDU of 8 is received.

As described above, according to this embodiment, the data communication system on the data transmission side specifies the transmission timing of the AK-PDU for the DT-PDU, and the data communication system on the data reception side holds this timing. By providing the means for transmitting the AK-PDU according to the timing requested by the transmitting side, it is possible to completely eliminate the difference in recognition regarding the timing of the data confirmation in both the data transmitting systems of the data transmitting side and the data receiving side. There is an effect that it is possible to avoid a decrease in communication efficiency due to meaningless retransmission of DT-PDU and disconnection of the connection due to excess number of DT-PDU retransmissions.

[0037]

As described above, in the data communication system according to the present invention, the DT-
The transmission timing of the AK-PDU for the PDU is specified, the data communication system on the receiving side holds this timing, and the AK-P follows the timing requested by the transmitting side.
Since the means for transmitting the DU is provided, it is possible to completely eliminate the difference in recognition regarding the timing of data confirmation in both the data transmitting system on the data transmitting side and the data receiving side, and it is meaningless to retransmit the DT-PDU. Of the DT-PDU and the disconnection of the connection due to the excess number of DT-PDU retransmissions can be avoided.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a data communication network system according to an embodiment of the present invention.

FIG. 2 is an overall configuration diagram of a data communication transmission system of the present embodiment.

FIG. 3 is an overall configuration diagram of a data communication receiving system according to the present embodiment.

FIG. 4 is a flowchart showing DT-PDU transmission control of the transmission side system of the present embodiment.

FIG. 5 is a flowchart showing DT-PDU reception control of the receiving side system of the present embodiment.

FIG. 6 is a DT-PDU shown in FIGS. 4 and 5 according to the present embodiment.
It is a figure which shows the transmission control procedure in communication control.

[Explanation of symbols]

 10 data communication transmission system 20 central processing unit 30 application program section 31 data transmission request means 32 transmission request block 33 AK-PDU transmission timing request area 40 data communication program 41 request acceptance means 42 DT-PDU creation means 43 AK-PDU request section Creating means 44 DT-PDU sending means 45 AK-PDU receiving means 46 DT-PDU resending means 47 DT-PDU resending timer 50 communication control device 60 communication line 110 data communication receiving system 120 central processing unit 130 data communication program 131 DT-PDU Reception means 132 AK-PDU control means 133 AK-PDU transmission timing holding means 134 AK-PDU creation means 135 AK-PDU transmission means 140 Communication control device 200, 210 Other data Shin system 300 data communication network

Claims (7)

(57) [Claims] 1. A data communication method for performing data communication while confirming delivery of data between data communication devices that can be connected to each other via a communication medium, wherein the data communication system on the transmitting side confirms the data on the receiving side. Create a data protocol that performs data transmission with the protocol transmission timing set, and send it to the data communication system on the receiving side.The data communication system on the receiving side uses the data protocol on the receiving side included in the data protocol that performs the received data transmission. With respect to the reception result of the data protocol for transmitting the data by monitoring the number of receptions of the data protocol for transmitting the data while holding the transmission timing of the data confirmation protocol and comparing the number of receptions with the held transmission timing value. The feature is to determine whether it is the transmission timing of the data confirmation protocol. Data communication method to be. 2. The data communication system on the receiving side creates a data confirmation protocol on the receiving side for the data protocol for transmitting data when the number of receptions of the data protocol for transmitting data matches the received transmission timing value. The data communication method according to claim 1, further comprising transmitting the data to the data communication system on the transmitting side. 3. The data communication system on the transmitting side, when the data confirmation protocol from the data communication system on the receiving side is not sent within a predetermined time, the data confirmation protocol on the receiving side with respect to the data protocol for transmitting data. the transmission timing of changing the timing so as to transmit the data confirmation protocol of the receiving side for each send data protocol for data transmission, according to claim 1 or請and transmitting the data protocol for data transmission < The data communication method according to claim 2. 4. A data communication system for performing data communication while confirming delivery of data between data communication devices that can be connected to each other via a communication medium, and specifies the transmission timing of a data confirmation protocol on the receiving side. And the transmission timing of the data confirmation protocol of the receiving side with respect to the data protocol for data transmission, if the data confirmation protocol is not sent from the partner communication device within a predetermined time after transmitting the data protocol for data transmission. Each time a data protocol for sending data is sent, the timing is changed so that the data confirmation protocol on the receiving side is sent, and the creating means for creating the data protocol for sending the data and the data sending created by the creating means are performed. And a transmission means for transmitting a data protocol. Data communication system. 5. A data communication system for performing data communication while confirming delivery of data between data communication devices connectable to each other via a communication medium, and receiving means for receiving a data protocol for transmitting data. Holding means for holding the transmission timing of the data confirmation protocol when the data protocol for transmitting data received by the reception means includes the transmission timing of the data confirmation protocol; and the holding means for holding the data confirmation protocol held by the holding means. A confirmation transmitting unit that creates and transmits a data confirmation protocol according to the transmission timing, the number of data protocols received by the receiving unit that performs data transmission, and the transmission timing value of the data confirmation protocol held by the holding unit. A data protocol that performs the data transmission by comparing Data communication system characterized in that it comprises discriminating means for discriminating whether the transmission timing of the data confirmation protocol for receiving the results of le. 6. A data communication system for performing data communication while confirming delivery of data between data communication devices connectable to each other via a communication medium, wherein a data confirmation protocol of a reception side is transmitted to a transmission side device. When the data confirmation protocol is not sent from the partner communication device within a predetermined time after transmitting the designation means for designating the timing and the data protocol for data transmission,
The transmission timing of the data confirmation protocol on the receiving side for the data protocol for transmitting data is changed so that the data confirmation protocol on the receiving side is transmitted every time the data protocol for transmitting data is sent. A receiving unit that includes a creating unit that creates and a sending unit that sends a data protocol that sends data created by the creating unit, a receiving unit that receives a data protocol that sends data, and a receiving unit that receives the data protocol. When the data protocol for data transmission includes the transmission timing of the data confirmation protocol, holding means for holding the transmission timing of the data confirmation protocol, and the data confirmation protocol according to the transmission timing of the data confirmation protocol held in the holding means Create and send A data protocol for performing the data transmission by comparing the number of receptions of the confirmation transmission means and the data protocol received by the reception means for data transmission with the transmission timing value of the data confirmation protocol held by the holding means. And a determination means for determining whether or not it is the transmission timing of the data confirmation protocol with respect to the reception result of 1. 7. The confirmation transmission means creates and transmits a data confirmation protocol when the determination means determines that the number of receptions of the data protocol for data transmission matches the received transmission timing value. The data communication system according to claim 5 or 6, characterized in that.