JPH01162433A - Radio relay system - Google Patents

Abstract

PURPOSE:To use the carrier of the same frequency with a radio station and a relay station to relay by executing the re-transmission after a demodulating signal is once stored with the relay station. CONSTITUTION:The transmission information from an observing station 6 is received by a receiver R of a relay station 7, demodulated and stored once to a RAM. After the prescribed time passes, the same carrier as the carrier frequency of an electric wave from the station 6 through a controller C, a transmitter T, etc., is modulated and re-transmitted to a supervising station 5. Consequently, by radio stations 5 and 6 and a relay station 7 to relay, the carrier of the same frequency can be used and the transmitter and receiver of the relay station can be simply constituted.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a wireless relay system, and more specifically, it is a wireless relay method that connects wireless telemeters or wireless stations of a telecontrol system that are located between two points that cannot communicate directly using the same frequency. The present invention relates to a wireless relay method that allows relaying using radio waves.

(Prior art) In communication between wireless stations located in locations where radio waves cannot directly reach, it is usually necessary to install a relay station at a required position where the radio waves from each wireless station can reach. In order to do this, it was necessary to use separate radio waves, with the frequencies of each radio wave transmitted from both sides separated by a required period of time, as shown in FIG.

That is, FIG. 2 is a conceptual diagram showing an example of a wireless relay method in a conventional telemeter system. Conventionally, as shown in the figure, monitoring station 2 and observation station 3, which are located across an obstacle such as mountain 1, each have a pair of transmitters and receivers (T,,R,)(
T2. R,,) and other necessary antennas ANT,,A
NT2. Controllers C+, C2, etc. are provided, and between these radio stations.

For example, there are two pairs of transmitters and receivers (1 and 1) on the top of the mountain.
, R1) (T2, R2) and the antenna ANT, , AN
A radio relay station 4 including a T4 and an O controller C3 is arranged, and the frequencies used by the respective transmitters and receivers are set to be different from each other so that the frequency f1 is used for the monitoring station system and the frequency f2 is used for the observation station system. It was configured by allocating things.

In addition, the relay station has transceivers TI and R1 for frequency fl and a receiver T2 for frequency f2 so that it can receive and transmit radio waves from each of the radio stations.
, R2.

According to this configuration, when a radio wave is transmitted from one radio station, it is received and demodulated by one receiver in the relay station 4, and at the same time, it is input to the other transceiver via the controller C3. By retransmitting on one frequency, a communication line between both radio stations can be secured.

However, in such a relay system that uses radio waves of different frequencies, sufficient frequency spacing is required to prevent the output of each transmitter at the relay station from going around to the other receiver and causing sensitivity suppression. Since it was necessary to allocate two frequencies, this was a factor that hindered the effective use of radio waves.

Furthermore, since the relay station requires two sets of transmitters and receivers capable of dealing with two different frequency dissipations, there is a drawback that the equipment cost is high. This becomes an extremely serious problem when the relay station is configured to have a dual system, one for active use and one for backup, in order to improve reliability.

(Object of the Invention) The present invention has been made in order to solve the drawbacks and problems of the conventional radio relay system, and is an object of the present invention, in which both the monitoring station and the observation station transmit or receive on the same frequency. The purpose of the present invention is to provide a wireless relay system that can make effective use of radio waves, and can easily and inexpensively configure a relay station.

(Summary of the Invention) In order to achieve the above object, in the wireless relay system of the present invention, in a wireless relay located between wireless stations that cannot directly communicate, radio waves transmitted from one wireless station are received and demodulated. The apparatus is provided with a means for temporarily storing the content, and is configured to retransmit the stored content using radio waves of the same frequency after the transmission from the one radio station is completed.

According to this method, the frequencies of the radio waves of both the monitoring station and the observation station can be made the same, and the relay station used only needs to be equipped with only one pair of transmitters and receivers that correspond to the same frequency.

(Example) Examples of the present invention will be described in detail below.

FIG. 1 is a block diagram showing an embodiment of the present invention, and like the conventional example, there is a telemeter installed at a position across the mountain 1.
This shows a case in which the system monitoring station 5, observation station 6, and relay station 7 are placed on the top of a mountain, and these three radio stations 5, 6, 7 all transmit radio waves of the same = -frequency f]. It has a transmitter T and a receiver R for transmitting and receiving data, and further includes a controller C interposed between these transmitters and receivers.

Further, the relay station 7 has a structure in which a memory device RAM capable of writing and reading is inserted between the receiver R and the controller C.

Note that other accessory devices that must necessarily be provided, such as a power supply device, will be omitted for the sake of simplicity.

In addition to the above-mentioned devices, the observation station 6 of the telemeter system is equipped with various sensors S such as a rain gauge and a thermometer, as well as a data detection device that quantizes or encodes the information from these sensors S. It is common to configure a system that includes

The operation in the above configuration will be explained.

First, at the observation station 6, information from various sensors S is collected at predetermined time intervals and stored sequentially, and the accumulated data is transmitted via the controller C at a predetermined time or in response to a command operation from the monitoring station 5. and input it to the transmitter T as a modulated signal,
At the same time, this transmitter T transmits radio waves with frequency f1 to antenna A.
Send via NT. This radio wave f1 is input to the receiver R of the relay station 7 via the antenna ANT, demodulated, and sequentially input to the storage device RAM.

This operation continues while radio waves are being transmitted from the observation station, and then when the radio waves from the observation station are interrupted, the storage device RA
The signal stored in M becomes the modulation power of the transmitter T via the controller C, and is similarly retransmitted as a radio wave with the frequency fl.

The radio waves thus relayed and retransmitted reach the monitoring station 5, are demodulated through the receiver R, and are taken in as observation data.

In the above explanation, we have described the case where information is transmitted from the observation station 7 to the monitoring station 5, but the same applies to the case where information is transmitted from the monitoring station 5 to the observation station 7. does not require any explanation.

In addition, when it is necessary to transmit information from the monitoring station 5 to the observation station 7, for example, when transmitting a command signal to send data to the observation station, or when transmitting a command signal inquiring about the status of the radio station equipment. For example, when there is a plurality of observation stations, a signal for sequentially polling these observation stations is transmitted.

In addition, when performing this polling, it is necessary to include necessary codes such as various code numbers to identify each station in the command signal sent out or the signal sent from the observation station, or to drive and control the relay station. There is no problem in inserting signals etc. as necessary.

Further, the following functions may be added to further improve the reliability of the system by utilizing the features of the present invention.

That is, after transmitting the necessary data and command signals from the observation station or monitoring station, the information once received from the relay station is retransmitted as explained above, but at this time, the information that was once received from the relay station is retransmitted from the relay station at the transmitting station. It receives a radio wave, demodulates it, and checks the content by comparing it with what was transmitted by its own station. If there is an error, it replays the same content after the relay station has finished transmitting. Submit all or any portions that are incorrect.

According to this means, it is possible to perform more reliable signal transmission by compensating for errors in the content from the relay station.

To this end, each station may be provided with a storage device for temporarily storing the content transmitted by the station itself, and means for comparing the stored content with the signal from the relay station.

In the following explanation, a premeter system has been described, but the present invention is not limited to this example, but can also be used in a telecontrol system or other wireless systems.

(Effects of the Invention) As explained above, the present invention is configured such that the relay station stores the demodulated signal once and then retransmits it after the required time has elapsed, so that the wireless station to be relayed and the relay station Not only can the radio waves used be of the same frequency, but also the minimum number of wireless devices that each wireless station should have.
There is no need to explain that it is possible to make efficient use of radio waves and to simplify and reduce the cost of equipment.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional relay system. T...Transmitter R...Receiver RAM...Storage device C...Controller 5...Monitoring station 6...Observation station
7... Relay station patent applicant Toyo Tsushinki Co., Ltd.

Claims (2)

[Claims] (1) In a system that performs communication between at least two wireless stations via a wireless relay station, information from one wireless station is temporarily stored in the wireless relay station, and after the transmission of the one wireless station is completed, the A wireless relay system characterized in that the stored information is retransmitted to the other wireless station using a carrier wave having the same frequency as the radio wave from the one wireless station. (2) The one radio station receives the radio waves retransmitted by the relay station, monitors the content, detects a match with the information transmitted by the own station, and if there is a mismatch, the relay station 2. The wireless relay system according to claim 1, further comprising means for retransmitting the same content or the inconsistent portion after the transmission of the content is completed.