JPH05103017A - Re-transmission data transmission system - Google Patents

Abstract

PURPOSE:To reduce the traffic of a transmission line and to quicken a transmission timing of newest data by re-composing data produced and to be sent newly into one packet in addition to preceding transmission data and sending the packet when the data to be sent newly are generated during the confirmation of transmittal of the transmission data. CONSTITUTION:When a state change 1 takes place, data S1 are sent to an opposite transmitter-receiver and the system is terminated as the normal sequence upon the receipt of an affirmative response AcK. When data S2 are sent to the opposite transmitter-receiver because of the occurrence of a state change 2 and no affirmative response AcK is returned, data S3 in a state change 3 caused newly in addition to the data S2 sent precedingly are re-composed into a same packet and it is sent to the transmitter-receiver. However, no affirmative response AcK is returned with respect to the data S2, S3, data S4 of a state change 4 caused newly are added to the data S2, S3 and re-composed into one packet and it is sent.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in a retransmission data transmission system of a transmitter / receiver. In particular, the present invention relates to a retransmission data transmission method of a transmission / reception device that may continuously occur at a moment when the frequency of data transmission in the delivery confirmation method is low.

[0002]

2. Description of the Related Art FIG. 3 is a sequence diagram showing the operation of a conventional retransmission data transmission system.

Conventionally, as shown in FIG. 3, in the retransmission data transmission method, when new data to be transmitted occurs during delivery confirmation after data transmission, the data is retransmitted last time as the data to be retransmitted when the delivery confirmation timer times out. There is a method in which newly generated data is assembled into a packet and transmitted after confirmation of delivery.

Further, there is a method of transmitting all data in a fixed cycle in consideration of the case where the data to be transmitted cannot be normally received by the receiving side.

[0005]

However, in such a retransmission data transmission method of the conventional example, in the case of the constant cycle all data transmission method, all the word data are always transmitted in a constant cycle, so that the transmission line Since the traffic becomes high and the frequency of the data to be transmitted is low, there is a drawback that transmitting all the data at a constant cycle deteriorates the transmission efficiency due to the small amount of transmission data.

Further, in the case of the method of retransmitting the same data as the data transmitted last time at the time of delivery confirmation timeout, the transmission timing of the transmission data is delayed in an apparatus in which data to be transmitted continuously occurs at a certain moment. was there.

The present invention solves the above-mentioned drawbacks, and an object of the present invention is to provide a retransmission data transmission system capable of reducing the traffic on the transmission line and accelerating the transmission timing of the latest data. .

[0008]

According to the present invention, in a retransmission data transmission system provided with a transmission / reception device for transmitting data, receiving an affirmative response from a transmission / reception device of the other party, and terminating the processing, the transmission / reception device transmits the data. If new data to be sent occurs during data delivery confirmation and the time limit for delivery confirmation has passed, this newly generated data to be transmitted is reassembled into the same packet and transmitted in addition to the previous transmission data. Means are included.

[0009]

When the data to be transmitted newly is generated during the delivery confirmation of the transmission data and the time limit of the delivery confirmation has passed, the transmission / reception device identifies the newly generated data to be transmitted in addition to the previous transmission data. Reassemble into packets and send.

As described above, the traffic on the transmission line can be lowered and the transmission timing of the latest data can be advanced.

[0011]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of a retransmission data transmission system according to an embodiment of the present invention.

In FIG. 1, the retransmitted data transmission system transmits data by transmitting an acknowledgment AC from the transmitting / receiving apparatus 2 of the other party.
The transmitter / receiver 1 receives K and terminates the processing.

The feature of the present invention is that the transmitting / receiving apparatus 1 adds to the previous transmission data when the transmission confirmation time elapses when new data to be transmitted occurs during transmission confirmation of the transmission data. It is intended to include means for reassembling the newly generated data to be transmitted into the same packet and transmitting it.

The operation of the retransmission data transmission system having such a configuration will be described. FIG. 2 is a sequence diagram showing the operation of the retransmission data transmission method of the present invention.

In FIG. 1 and FIG. 2, when the state change occurs, the data S1 is transmitted to the transmission / reception apparatus 2 of the other party, and the acknowledgment ACK is received, so that the normal sequence ends. Next, since the state change occurs, the data S2
Is transmitted to the transmission / reception device 2 of the other party, a positive response A
Data S2 transmitted last time because CK was not returned
In addition, the newly generated state change data S3 is reassembled into the same packet and transmitted to the transmitter / receiver 2. However, since the positive acknowledgment ACK for the data S2 and S3 is not returned, the newly generated data S4 of the state change is reassembled into the same packet and transmitted in addition to the data S2 and S3. When the positive acknowledgment ACK for the data S2 to S4 is received, the sequence ends normally.

As described above, the present embodiment is an apparatus in which the frequency of occurrence of data to be transmitted is low and may occur continuously at a certain moment, and the method of transmitting data only when the data changes. The traffic on the transmission path can be lowered, and if new data to be sent during delivery confirmation occurs, it is reassembled into a packet including the newly generated data as data to be retransmitted when the delivery confirmation timer times out. Since the method of transmitting the latest data is adopted, the timing of transmitting the latest data can be advanced.

[0017]

As described above, the present invention has an excellent effect that the traffic on the transmission path can be lowered and the transmission timing of the latest data can be advanced.

[Brief description of drawings]

FIG. 1 is a block configuration diagram of a retransmission data transmission system according to an embodiment of the present invention.

FIG. 2 is a sequence diagram showing the operation of the retransmission data transmission system of the present invention.

FIG. 3 is a sequence diagram showing the operation of a conventional retransmission data transmission method.

[Explanation of symbols]

 1, 2 transceiver

Claims (1)

[Claims] 1. A retransmission data transmission method comprising a transmitting / receiving device which transmits data, receives an affirmative response from a counterpart transmitting / receiving device, and terminates processing, wherein the transmitting / receiving device is newly added during confirmation of delivery of the transmitted data. When data to be transmitted has occurred and the time limit for delivery confirmation has passed, in addition to the previous transmission data, this newly generated data to be transmitted is reassembled into the same packet and transmitted. Retransmission data transmission method.