JPH0446420A - Area communication system - Google Patents

Abstract

PURPOSE:To eliminate the need for retransmission request from a receiver side and to attain efficient communication by providing an intermittent noise detector to a sender side, or the sender side and the receiver side, and detecting occurrence of noise so as to control the transmission or the transmission and reception. CONSTITUTION:When an intermittent noise detector 2 at a sender side detects intermittent noise, it is informed to a transmitter 1 and a data processing section 3, the transmitter 1 stops the transmission by taking a intermittent noise detection signal as a trigger to store a data to be sent into the processing section 3. In this case, the intermittent noise is detected by a receiver side intermittentt noise detector 5 and a data representing the detection is supplied to a receiver 4 and a data processing section 6, the receiver 4 stops reception by using the noise detector signal as a trigger and the processing section 6 stops data reception. When no detector 5 is arranged to the receiver side, the sender side operation is equal to above and the receiver side continues the operation, but the reception data is verified for its format and aborted because no meaning as the data exists. Thus, the efficient communication is attained without need of a retransmission request from the receiver side.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an area communication system for performing data transmission communication in a limited area.

[Prior Art] In general, in communication, if correct data is not received on the receiving side, the receiving side issues a retransmission request to the transmitting side, thereby transmitting and receiving the correct data, and a retransmission request from the receiving side is not necessary. be.

[Problems to be Solved by the Invention] An object of the present invention is to provide an area communication system that eliminates the above-mentioned drawbacks and allows efficient communication.

[Means and effects for solving the problems] In order to solve the above problems, the present invention provides an intermittent noise detector provided on the transmitting side in an area communication system that performs data transmission communication in a limited area. , transmitter,
Consists of a data processing unit, a receiver provided on the receiving side, a data processing unit, and an intermittent noise detector provided as necessary. This system is characterized by detecting the occurrence of noise using an intermittent noise sensor, and controlling transmission, or transmission and reception, to ensure efficient communication.

[Embodiment] FIG. 1 shows an embodiment of the present invention, which includes an intermittent noise detector 2, a transmitter 1, and a data processing section having a function of accumulating input data input from the outside, provided on the transmitting side. 3. The receiving side is equipped with an intermittent noise detector 5, a receiver 4, and a data processing unit 6 that has a function of accumulating input data input from outside.When intermittent noise occurs, the transmitting side and the receiving side Intermittent noise detectors 2 and 5 provided on the side detect the occurrence of noise and control transmission and reception.

FIG. 2 shows another embodiment of the present invention, which includes an intermittent noise detector 2 provided on the transmitting side, a transmitter 1, a data processing section 3 having a function of accumulating input data inputted from the outside, and a receiver. It consists of a receiver 4 provided on the side, and a data processing section 6 that has a function of accumulating input data input from the outside.
When intermittent noise occurs, the intermittent noise sensor 2 provided only on the transmitting side detects the occurrence of the noise and controls only the transmission.

Here, intermittent noise refers to noise that is not continuous noise, and when looking at the frequency distribution of impulsive noise, the frequency of large pulses is low, and the frequency of small pulses is high. In this case, intermittent noise that is not continuous, such as large pulsed noise, but is intermittent at certain time intervals, is called intermittent noise.

Furthermore, data refers to voice and data.

Next, the operation of this embodiment will be explained.

■Noise inhibit method As shown in Figure 1, if intermittent noise is not detected,
On the transmitting side, data is input to the data processing unit 3 and transmitted to the transmitter 1.
sent through. On the receiving side, the output data from the transmitter 1 is received by the receiver 4 and passed to the data processing section 6. When intermittent noise is detected by the intermittent noise detector 2 on the transmitting side, the transmitter 1 and the data processing unit 3
The transmitter 1 stops transmitting using the noise detection signal as a trigger, and the data processing section 3 stores the data to be transmitted.

At this time, the intermittent noise is also detected by the intermittent noise detector 5 on the receiving side, and the data to that effect is sent to the receiver 4 and the data processing unit 6.
The receiver 4 stops receiving the data, and the data processing unit 6 stops receiving the data using the noise detection signal as a trigger. Reception will resume as soon as the intermittent noise stops.

Next, as shown in FIG. 2, there is also a system in which the receiving side is configured without an intermittent noise detector, the operation on the transmitting side is the same, and the operation on the receiving side is as follows.

Even when intermittent noise is detected by the intermittent noise sensor 2 on the transmitting side, the receiver 4 and the data processing section 6 continue to operate. At this time, the format of the data is verified, and since it has no meaning, it is discarded.

This noise inhibit method inhibits data transmission when noise occurs, and the relationship among the transmission packet ready state (transmission ready), packet transmission timing pulse, and noise is as shown in FIG.

■Noise trigger method As shown in Figure 1, the transmitting side does not transmit data at first, but detects the noise with the intermittent noise detector 2. When the noise disappears, it senses the end of the noise and sends data to that effect. The signal is sent to the data processing unit 3 and the transmitter 1, and data transmission is performed using the signal as a trigger. On the receiving side, like the transmitting side, data is not initially received, but the intermittent noise detector 5 detects the noise, and when the noise disappears, the end of the noise is sensed, and the data to that effect is transmitted to the data processing unit 6 and the receiver 4. Data reception is performed using that signal as a trigger.

Next, as shown in FIG. 2, there is also a system in which the receiving side is configured without an intermittent noise detector, the operation on the transmitting side is the same, and the operation on the receiving side is as follows.

Even when intermittent noise is detected by the intermittent noise sensor 2 on the transmitting side, the receiver 4 and the data processing section 6 continue to operate. At this time, the format of the data is verified, and since it has no meaning, it is discarded.

In this noise trigger method, when noise occurs, data is transmitted assuming that there is a high probability that there will be no noise for a certain period of time.

The noise relationship is as shown in FIG.

■Forced retransmission method As shown in Figure 1, if intermittent noise is not detected,
On the transmitting side, data is input to the data processing section 3 and transmitted through the transmitter 1. On the receiving side, the output data from the transmitter 1 is received by the receiver 4 and passed to the data processing section 6. When intermittent noise is detected by the intermittent noise sensor 2 on the transmitting side, this is communicated to the transmitter 1 and data processing section 3, and the transmitter 1 and data processing section 3 detect the intermittent noise using the noise detection signal as a trigger. Forcibly retransmits data that has been interfered with by noise. At this time, the intermittent noise is also detected by the intermittent noise sensor 5 on the receiving side, and data to that effect is transmitted to the receiver 4 and data processing unit 6. The receiver 4 stops receiving the noise detection signal as a trigger, and the data The processing unit 6 stops receiving data. Reception will resume as soon as the intermittent noise stops.

Next, as shown in FIG. 2, there is also a system in which the receiving side is configured without an intermittent noise detector, the operation on the transmitting side is the same, and the operation on the receiving side is as follows.

Even when intermittent noise is detected by the intermittent noise sensor 2 on the transmitting side, the receiver 4 and the data processing section 6 continue to operate. At this time, the format of the data is verified, and since it has no meaning, it is discarded.

This forced retransmission method works if there is noise within a certain period of time.
The data is forcibly retransmitted as if it were corrupted.
The relationship between the sending packet ready state (sending ready), the packet sending timing pulse, and noise detection is shown in FIG.

■ Combined method of ■ and ■ above Normally, data is transmitted using the noise inhibit method, and the frequency of noise inhibit is monitored, and if the frequency of noise inhibit is exceeded, the data is transmitted using the noise trigger method.

Since this composite method (1) above does not have much noise, it is an improved version of the above method (2), and the relationship between the above method (2) and (9) is as shown in FIG.

(2) Modified method of (2) above In this method (2), the trigger for data transmission is the logical sum of external intermittent noise and pseudo-intermittent noise generated by the data processing section.

This modified method (■) above does not have that much noise, so it is an improved version of the method (2) above. The result is as shown in FIG.

Next, the background of the present invention will be described.

In order to display the ever-changing spectrum of electromagnetic environments over a wide range of frequencies within buildings and premises, we attempted an experiment using a method to express multiple spectra at the same time. According to experimental results, pulsed noise is dominant. There is little continuous noise. There is a gap in the noise, and this time is used to transmit data. Examples of noise include electric lights and cars.

In this way, data communication is performed by actively using noise.

Note that communication using weak radio waves has a short range and therefore a narrow communication area. Therefore, the influence of the noise has an equal effect on the transmitting side and the receiving side.

The present invention is directed to voice and small volume data transmission. In other words, even if the audio is interrupted to some extent, the content can be understood.

Or just blocking out noise can be effective. Also,
Small-capacity packet data transmission completes transmission between intermittent noises.

[Effects of the Invention] As is clear from the above embodiments, the present invention includes an intermittent noise detector installed in the transmitting section and the receiving section (or only the transmitting section) and controlling data transmission and reception using a noise detection signal. With this configuration, there is no need for a retransmission request from the receiving side, and there is an effect that communication with high communication efficiency becomes possible.

[Brief explanation of the drawing]

FIG. 1 is a configuration explanatory diagram showing one embodiment of the present invention, FIG. 2 is a configuration explanatory diagram showing another embodiment of the present invention, and FIGS. 3 to 7 are implementations of FIGS. 1 and 2. 5 is a timing chart for explaining an example operation. 1... Transmitter, 2.5... Intermittent noise detector, 3゜6... Data processing unit, 4... Receiver.

Claims (2)

[Claims] (1) In an area communication system that performs data transmission communication for a limited area, an intermittent noise detector, a transmitter, and a data processing unit are provided on the transmitting side, and a receiver and data processing unit are provided on the receiving side. An area communication system characterized in that when intermittent noise occurs, an intermittent noise detector provided on the transmitting side detects the occurrence of the noise and controls transmission. (2) In an area communication system that performs data transmission communication for a limited area, an intermittent noise detector provided on the transmitting side, a transmitter, a data processing unit, and an intermittent noise detector provided on the receiving side , a receiver, and a data processing section, and when intermittent noise occurs, the area is characterized in that when intermittent noise occurs, the intermittent noise detectors provided on the transmitting side and the receiving side detect the occurrence of the noise, and control transmission and reception. Communication method.