JPS62207041A - Transmitter and receiver module - Google Patents

Abstract

PURPOSE:To change the number of times of retransmission at a fault of transmission in response to the importance of a sent data and a traffic of the transmission line by providing a number of times of retransmission setting means setting optionally the number of times of retransmission if data transmission is failed. CONSTITUTION:A transmission/reception module 3 controls a transmission/ reception equipment 2 and is provided with a transmission control means 4 taking over a sending data to the equipment 2 to allow the equipment to make transmission and a transmission fault detection means 5 detecting that the sent data collide with each other or the sent data is not correctly received by a transmission/reception equipment of sending destination and the reply is not sent, and further with a number of times of retransmission setting means 6 and a retransmission means making retransmission till the number of times of retransmission set optionally before the start of transmission by the means 6. A transmission/reception module 3 uses a power line carrier module 9 as an exclusive use of communication control and of two module constitution feeding the internal processing function except communication to a host module 10.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a transmitting/receiving module that is effective when applied to, for example, a transmitting/receiving device using a single force line carrier communication system.

[Conventional technology]

FIG. 5 is an application configuration diagram of a conventional power line carrier transceiver module described in Report 4F (March 1985 Interim Report) of the Power Line Carrier Communication Research Committee of the D-Wave Technology Association.

In the figure, (1) is a power line as a signal transmission path, (
2) is a modulation/demodulation device that modulates data into a high frequency signal suitable for superimposing on the power line (1) and demodulates the received high frequency signal; (3) is a transmitting/receiving module;
This transmitter/receiver module (2) includes a power line carrier transmitter/receiver module (9) that controls the modulation/demodulator (2) to control signal transmission and reception, and a host module (1) that controls the entire system.
0). Both modules (9).

(10) consists of a CPU, especially a module (10)
An input switch (8) and a display (not shown) are provided as necessary.

(11), (13) are host modules (10),
The power line carrier module (9) and the data line (12L) connecting the modem (2) are similarly connected to these (1).
0) e (9) = (2) This is a control line that connects.

FIG. 6 shows a flowchart of a transmission operation in a conventional transmission/reception module, in which the number of retransmissions preset in the retransmission counter in step (6-1) is set to, for example, three times.

Next, the operation will be explained. Upon input by the input switch (8), the host module (10) starts transmitting. The host module (10) is 1, the destination address (22), and the control code (23) as shown in Figure 7.
, message length (24), and data (25) (hereinafter collectively referred to as packets) are sent to the power line transport module (
9) to the data line (11), control #j! (12) Transfer using.

The tV force line transport module (9) sends a synchronization pulse (17) and a self address (18), f
Add a check code (19) to fl and assemble it as a packet, and then connect it to the data line (13) and control line (t4) in order.
The modulator/demodulator (2) is operated using the signal, and the signal is converted into a high frequency signal and transmitted onto the power line (1) (step 6-2).

At this time, the influence of noise on the power line (1) and packet collisions due to simultaneous transmission of multiple modules, etc. (step 6-3)
14), the power line transport module (9) receives the packet as
It is necessary to retransmit it on the power edge (1).

For this reason, the power line transport module (9) is equipped with an automatic retransmission function, and automatically retransmits (step 6-5.6) up to the number of retransmissions set in the above (step 6-1).
There is no need for the host module (10) to hand over the packet to the power line transport module (9) again.

[Problem that the invention seeks to solve]

Conventional transmitter/receiver modules are configured as described above, so the number of retransmissions in the event of a transmission failure is fixed, and transmission efficiency is low on lines with low reliability and slow transmission speeds, such as power line transport. decreases significantly.

For example, if the number of retransmissions is set to a small value, such as 3 times compared to 4 in the conventional example, the reliability of data transmission will be impaired, and conversely, if the number of retransmissions is fixed to a large value, the reliability of data transmission will be reduced. However, if the destination terminal is disconnected, there are problems such as the transmission line being occupied for a long time due to retransmission of invalid data.

This invention was made to solve the above-mentioned problems, and provides a transmitting/receiving module that can change the number of retransmissions in the event of a transmission failure, depending on the importance of the data to be transmitted and the traffic on the transmission path. The purpose is to

[Means for solving problems]

The transmitting/receiving module according to the present invention has a retransmission count setting means for arbitrarily setting the number of retransmissions to be performed when data transmission fails.

[Effect]

The retransmission count setting means in this invention can set the number of retransmissions for each data to be transmitted, so that important data can be transmitted reliably by setting a large number of retransmissions, and conversely, when the traffic on the transmission path is large, Set the number of retransmissions to a small number to avoid increasing traffic.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure is a configuration diagram of a transmitting/receiving module according to an embodiment of the present invention. In FIG. 1, (1) is an information transmission path using a power line, (2) is a transmitting/receiving device that transmits and receives signals via the information transmission path (1), and (3) is the transmitting/receiving device (2).
It is a transmitting/receiving module that controls the This transmitting/receiving module (3) starts control by an input means (8) such as a switch, and transmits the transmitted data to the transmitting/receiving device (2) and causes the transmitting control means (4) to perform the transmission. transmission failure detection means (5) for detecting that the transmitted data was not correctly received by the transmission/reception device of the transmission destination and no response was sent; and retransmission count setting means (6).
), and retransmission means (
7).

FIG. 2 is an applied circuit block diagram of the transmitter/receiver module, which is common to that of the conventional module. (L) corresponds to the limit transmission line in FIG.

The transmitting/receiving module (3) in the above No. 11:A corresponds to the two modules shown in FIG.
It has a 2-module configuration in which the force line transport module (9) has one communication unit (exclusively for wholesale), and the host module (10) has internal processing functions other than communication.

Then, the input child V (S), the retransmission setting means (
6) is included in the host module (10), and includes a transmission control means (4), a transmission failure detection means (5), and a retransmission (if means) (7).
) is where the power line transport module (9) stands.

FIG. 2 is a flowchart of the transmission operation of the above-mentioned transmission/reception module (3), in which the transmission internal answer judgment unit (15) is represented by a dotted line frame.
is the d publication separate part in the transmission data of step 2-1 and step 2
-2. FIG. 6 shows the operation of the host module (10), which is one step different from the transmission operation of the conventional device.

In addition, the retransmission count counter section in step 2-4, the packet transmission control section in step 2-5, and the step 2-6.2-7
The portion outside the dotted line frame consisting of the transmission failure detection unit in step 2-8 and the retransmission unit in step 2-8 and 2-9 is a portion common to the transmission operation of the conventional device and represents the operation of the power line transport module (9).

FIG. 3 shows the transmission data format of the transmission/reception module.

Next, the operation of the above embodiment will be explained with reference to FIGS. 1 to 3. In FIG. 1, when there is an input from the switch (8) K, the host module (10) internally generates a data transmission request and enters the transmission process shown in the flowchart of FIG.

First, host Moshu v (10) determines the content of the transmission data (step 2-1). For example, if the transmitted data is load control data, it is determined that it is important, and the number of retransmissions is set to a large value of 16 times (step 2-2).
.

Next, the host module (10) hands over the transmission packet to the power line transport module (9), but at this time, as shown in FIG.
Add and hand it over.

In step 2, the power line transport module (9) sets the given number of retransmissions in the retransmission counter as shown in FIG.
-4), enters packet transmission control (step 2-5).

As shown in FIG.
S), & appends a check code (19) to the end, passes the packet to the modem t(2), controls the modem (2), and transmits the packet onto the power line (L).

If the 4-line transport module (8) detects that the transmission data has collided with the transmission failure detection unit in step 2-6.2-7 shown in FIG. If it is detected that the response code ACK (20) is not returned, step 2-8.2-
The retransmission unit 9 decrements the retransmission counter, and the process returns to the packet transmission control unit 2-5 again.

Similarly, the power green transport module 1v (9) has a maximum of 16
Since the packet is automatically retransmitted up to the third time, there is a high probability that the packet will be received by the destination transmitting/receiving device.

Conversely, the host module (10) performs step 2- in Figure 2.
In step 1, the content of the sent data is determined, and if the data is response request data for terminal connection check, and the destination terminal may have been disconnected, the sender determines in step 4-
If Il'Afr is received, the number of retransmissions is set to a small value such as three times in step 2-3.

Therefore, the transmitting/receiving module (3) automatically retransmits up to three times. Since the number of retransmissions is small, even if the transmitted data is not received, there is less need for traffic on the transmission path.

In the above embodiment, as shown in FIG. 1, the two-module configuration is a transmitting/receiving module (9) and a host module (10) having functions other than transmitting/receiving as well as a control function for one cosmic transmitting/receiving module (9). However, as shown in Fig. 4, only one power line transport transceiver module (21) has the functions of both the host module (10) and the power line transport module (9) in Fig. 5.
It may also have a modular configuration.

Further, in the above embodiments, a case has been described in which a power line is used as an information transmission path, but even if other transmission paths with low reliability are used, the same effects as in the above embodiments can be achieved.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to arbitrarily set the number of retransmissions in the case of a transmission failure in the transmitting/receiving module, so it is possible to arbitrarily set the number of retransmissions in the case of a transmission failure. Even when a communication method is used, there is an effect that a transmitting/receiving module with high transmission efficiency can be obtained.

[Brief explanation of drawings]

The IT diagram is a configuration diagram of a transmitting/receiving module according to an embodiment of the present invention. Fig. 2 is a flowchart of the transmission operation of the transceiver module according to the present invention, Fig. 3 is its transmission data format, Fig. 4 is an applied circuit block diagram of the transceiver module according to another embodiment of the invention, and Fig. 5 is a diagram of the transmitter/receiver module. FIG. 6 is a block diagram of an applied circuit, FIG. 6 is a flowchart of a transmission operation in the conventional transmitting/receiving module 2, and FIG. 7 is a format of the transmitted/received data. In the figure, (L) is an information transmission path, (2) is a transmitting/receiving device, (3) is a transmitting/receiving module, (4) is a transmission control means,
(5) is a transmission failure detector [, (6) is a retransmission count setting means, and (7) is a retransmission means. In addition, in the figures, the same reference numerals indicate the same or corresponding parts. Agent: Patent attorney Masuo Oiwa (and 2 others) Figure 1”
4 people%5-x-71/Figure 2Figure 4Figure 5Figure 6

Claims (1)

[Claims] (1) In a transmitting/receiving module that controls a transmitting/receiving device that transmits and receives signals via an information transmission path to perform communication,
A transmission failure detection means for detecting that data transmission has failed, a retransmission means for retransmitting data at that time, and a retransmission means for arbitrarily setting the number of retransmissions for the retransmission means according to the importance of the communication content. A transmitting/receiving module comprising a frequency setting means.