JPH03107229A - Communication control system - Google Patents

Abstract

PURPOSE:To reduce number of retransmission requests when the line quality is deteriorated and lots of retransmission requests take place, and to improve the data transmission efficiency by setting a repetitive transmission number in response to a retransmission processing area based on a transmission notice and a retransmission notice. CONSTITUTION:A retransmission processing frequency discrimination means 13 discriminates a frequency of retransmission processing based on a retransmission notice outputted in response to transmission notice and retransmission processing outputted in response to the transmission processing of a transmission data by a transmission reception means 11 and outputs the prescribed discrimination signal to a transmission number setting means 15 repetitively. The means 15 sets the repetitive transmission number of times in response to the discrimination signal. Then the means 11 sends each transmission data repetitively by a number in response to the repetitive transmission number set by the means 15. Since the transmission is implemented repetitively at a proper number in response to the line quality, the normal reception rate is improved and the retransmission request is reduced and the data transmission efficiency is improved.

Description

[Detailed Description of the Invention] [Summary] Regarding a communication control method that makes it possible to reduce the number of retransmission processes performed by the transmitting side in response to a request from the receiving side when the line quality is poor, the present invention relates to a communication control method that makes it possible to reduce retransmission processing performed by the transmitting side in response to a request from the receiving side. In order to improve data transmission efficiency by reducing retransmission requests, the system is equipped with a transmitting/receiving means that performs retransmission processing of transmitted data in response to retransmission requests sent from opposing equipment due to deterioration in line quality. In the communication control method, the transmitting/receiving means includes means for repeatedly transmitting the transmission data a number of times according to a set number of repeated transmissions, and the frequency of retransmission processing is determined according to a transmission notification and a retransmission notification of the transmitting/receiving means. , a retransmission processing frequency determining means for outputting a predetermined determination signal, and a repeat transmission frequency setting means for setting the number of repeated transmissions in accordance with the determination signal.

[Industrial application field]

The present invention relates to a communication control method that makes it possible to reduce retransmission processing in a transmitting/receiving device in which the transmitting side performs retransmission processing in response to a request from the receiving side when line quality is poor.

[Conventional technology]

Conventionally, when a transmission error occurs, the receiving terminal side recognizes this and sends a request to retransmit the data to the transmitting terminal, and the transmitting terminal retransmits the requested data in response.

FIG. 4 is a diagram showing data exchange between transmitting and receiving terminals in a conventional communication control system.

In the figure, ■ indicates the data exchanged via the transmission line 43 between the transmitting terminal 41 and the receiving terminal 42 during normal times, and ■ indicates the data exchanged via the transmission line 43 between the transmitting terminal 41 and the receiving terminal 42, respectively, when a transmission error occurs in the conventional communication control method, and the time series of data exchange The relationships are sequential from top to bottom. In addition, "x" indicates data where a transmission error occurred.
“→” indicates the data transmission direction.

If the line quality is good and reception is normal, the transmitting terminal 41 sends data one after another to the receiving terminal 42, as shown in ■ in Figure 4, data (a), data (b), and so on. Send. However, when the receiving terminal 42 recognizes that a transmission error has occurred in the data (a), it sends a retransmission request to the transmitting terminal 41 specifying the data (a) as shown in (■) in FIG. In response, the transmitting terminal 41 retransmits the data (a).

[Problem to be solved by the invention] In such a conventional communication control system, if the line quality is good, the receiving terminal will not send many retransmission requests to the transmitting terminal, and the data transmission efficiency will be greatly affected. do not have. However, if the line quality is poor and retransmission requests occur frequently, this will lead to an increase in the amount of data exchanged between the two terminals and an increase in the amount of processing required to control the communication procedures of the transmitter and receiver of both terminals.
Data transmission efficiency could be significantly reduced.

The present invention provides solutions for cases where line quality is poor and retransmission requests occur frequently.
An object of the present invention is to provide a communication control method that can reduce retransmission requests and improve data transmission efficiency.

[Means to solve the problem]

FIG. 1 is a block diagram of the principle of the present invention.

The communication control system includes a transmitting/receiving means 11 that performs retransmission processing of transmitted data in response to a retransmission request sent from an opposing device due to deterioration in line quality.

The transmitting/receiving means 11 includes means for repeatedly transmitting the transmission data a number of times corresponding to the set number of repeated transmissions.

The retransmission processing frequency determining means 13 determines the retransmission processing frequency according to the transmission notification and the retransmission notification from the transmitting/receiving means 11, and outputs a predetermined determination signal.

In response to the determination signal, the repeat transmission count setting means 15
Set the number of repeat transmissions.

[For production]

The retransmission processing frequency determination means 13 determines the retransmission processing frequency based on the transmission notification outputted by the transmission/reception means 11 in response to the transmission processing of the transmission data and the retransmission notification outputted in response to the retransmission processing, and outputs a predetermined determination signal. Repeated transmission count setting means 1
Output to 5.

The number of repeated transmissions setting means 15 sets the number of times of repeated transmissions according to this determination signal.

The transmitting/receiving means 11 repeatedly transmits each transmission data a number of times corresponding to the number of times of repeated transmission set in the number of repeated transmissions setting means 15.

〔Example〕

Embodiments of the present invention in packet communication will be described in detail below based on the drawings.

FIG. 2 is a diagram showing an embodiment of the configuration of a transmission/reception control section that implements the communication control method invented by Zero.

In the figure, the transmission/reception control section 20 includes a transmission packet number counter 21 that counts the number of packets transmitted by the transmission/reception section 25, a retransmission packet number counter 22 that counts the number of packets retransmitted in response to a request from an opposing receiving terminal, and each of these. The transmission repetition counter 24 is referred to by the transmission/reception unit 25 as the number of times each packet is repeatedly transmitted. configured.

The transmission number switching determination unit 23 performs an operation of resetting the transmission packet number counter 21, the retransmission packet number counter 22, and the transmission repetition counter 24 at the start of the transmission operation.

The transmission number switching determination unit 23 checks the contents of the retransmission packet number counter 22 (
Hereinafter, it will be referred to as "R". ) and set the predetermined value (for example,
"32"), and the set value (hereinafter referred to as "N") to the transmission repetition counter 24 is determined as follows.

If R is less than 32, leave N at its current value.

If R is 32 or more, N is increased by a predetermined value (for example, "1") from the current value. Furthermore, when the value of the retransmission packet number counter 22 recovers to a predetermined value, the value set for the transmission repetition counter 24 can also be reduced or reset to the initial value in conjunction with this.

The transmission frequency switching determination unit 23 sets the setting value determined in this manner in the transmission repetition counter 24, and
The transmission packet number counter 21 and the retransmission packet number counter 22 are reset, and the transmission operation is continued for unsent packets.

In the continued packet transmission operation, the transmitting/receiving unit 25 repeatedly transmits each packet a number of times according to the set value of the transmission repetition counter 24 based on a predetermined transmission order.

Note that the criteria for determining the frequency of occurrence of retransmission requests based on the count values of the transmission packet number counter 21 and the retransmission packet number counter 22, the setting value for the transmission repetition counter 24 according to the determination result, and the number of retransmission requests that are repeatedly transmitted during repeated transmission are The transmission order of the same packets can be set arbitrarily.

Data exchange between transmitting and receiving terminals using the communication control method of this embodiment will be explained below.

FIG. 3 is a diagram showing data exchange between transmitting and receiving terminals when a transmission error occurs in this embodiment.

In the figure, the chronological relationship of data exchange is sequential from top to bottom. "X" indicates data in which a transmission error has occurred, and "→" indicates the data transmission direction.

In the communication control system of this embodiment, as shown in the figure, the retransmission operation is performed in the same manner as in the conventional method, but when retransmission requests occur more frequently than a certain level, the transmitting terminal 31 spontaneously repeatedly transmits each piece of data.

Note that when the receiving terminal 32 receives a plurality of identical packets, it takes in only one of the packets that was received normally, and discards the other. This is because if a receiving terminal receives duplicate identical packets and receives them without any transmission errors, sequence control in communication procedure control will not be performed normally. Furthermore, the receiving terminal 32 requests retransmission as long as any of the received identical packets is normally received (corresponding to the second packet (a) or the first packet (b) in FIG. 3). shall not be sent.

In this way, the transmitting terminal 31 spontaneously repeatedly transmits each packet an appropriate number of times depending on the quality of the transmission line. Therefore, it is possible to reduce retransmission requests that occur frequently when line quality is poor.

Regarding the correspondence between this embodiment and the principle block diagram of the present invention shown in FIG.
, the retransmission packet number counter 22 and the transmission frequency switching determination section 23 correspond to the retransmission processing frequency determination means 13, the transmission repetition counter 24 corresponds to the repetition transmission frequency setting means 15, and the transmitting/receiving section 25 corresponds to the transmitting/receiving means 11, respectively.

〔Effect of the invention〕

As described above, according to the present invention, individual data can be repeatedly transmitted an appropriate number of times depending on the line quality, thereby increasing the normal reception rate, reducing retransmission requests, and improving data transmission efficiency. can be increased. therefore,
It is possible to avoid an increase in the amount of data exchanged between the transmitting and receiving terminals due to the frequent occurrence of retransmission requests, as well as an increase in the amount of processing required to control the communication procedures of the transmitting section and the receiving section of both terminals.

[Brief explanation of drawings]

FIG. 1 is a block diagram of the principle of the present invention. FIG. 2 is a diagram showing an embodiment of the configuration of a transmission/reception control unit that realizes the communication control method of the present invention. FIG. 3 is a transmission/reception terminal when a transmission error occurs in this embodiment. FIG. 4 is a diagram showing data exchange between transmitting and receiving terminals in a conventional communication control system. In the figure, ■ is a transmitting/receiving means, 3 is a retransmission processing frequency determining means, 5 is a repeat transmission count setting means, 0 is a transmitting/receiving control unit, l is a transmitting packet number counter, 22 is a retransmitting packet number counter, 23 is a transmitting frequency switching determination 24 is a transmission repetition counter, 25 is a transmitting/receiving unit, 31.41 is a transmitting terminal, 32.42 is a receiving terminal, and 33.43 is a transmission line.

Claims (1)

[Claims] (1) In a communication control system comprising a transmitting/receiving means (11) that performs retransmission processing of transmitted data in response to a retransmission request sent from an opposing device due to deterioration in line quality, the transmitting/receiving means (11) includes: It includes means for repeatedly transmitting the transmission data a number of times corresponding to a set number of repeated transmissions, and determines a retransmission processing frequency in accordance with the transmission notification and retransmission notification of the transmitting/receiving means (11), and outputs a predetermined determination signal. A communication control method comprising: a retransmission processing frequency determination means (13); and a repetition transmission number setting means (15) for setting the number of repetition transmissions according to the determination signal.