JPS6324332B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a disaster prevention administrative radio system used for general administrative work and communication of disaster prevention instructions, and in detail, the channel switching between normal waves and backup waves at a terminal station is performed according to instructions from a control station. Concerning disaster prevention administrative radio system signaling system.

For example, the prefectural office, each prefectural branch agency, municipal office, etc. is connected via a communication line, and while one frequency (ordinary wave) on a single communication channel is normally used for general administrative affairs, there is additional backup in the event of a disaster. The Disaster Prevention Administrative Radio System exists as a communication system that uses one frequency to transmit prefectural instructions to each administrative agency.

FIGS. 1 and 2 are for explaining the present system. This system consists of a control station 1 located at a leading administrative agency such as a prefectural office, a relay station 2 located at a mountaintop, etc., and a single wireless system municipal block 3.
It is composed of. The control station 1 includes a control stand 11 that performs control, a signal device 12 that sends and receives signals to and from the relay station 2, a control stand 11, and a signal device 1.
2, as well as a central office line and an extension line (not shown). The relay station 2 also includes a normal wave wireless relay device 21 that transmits and receives normal waves, and a backup wave wireless relay device 22 that transmits and receives backup waves. Furthermore, the single radio system municipal block 3 is comprised of municipal terminal stations 3A to 3X which perform transmission and reception using normal waves or backup waves.

Figure 1 shows the communication setup at all times.
is in a dormant state, and the single radio relay device 2 for normal waves is in a dormant state.
Only 1 is in operation. In this state, it is assumed that the control station 1 and one municipal terminal station in the single radio system municipal block 3, for example, the terminal station 3A, communicate with each other.

When the exchange 13 sends out a paging signal for the terminal station 3A, the signaling device 12 sends a multi-frequency signal corresponding to the dial number for the terminal station 3A to the ordinary wave single radio relay device 21. The single radio relay device for normal waves modulates the carrier wave of frequency _f1 assigned as the normal wave and transmits it to the single radio system municipal block. When the terminal station 3A demodulates the received signal and detects a multi-frequency signal corresponding to its own dialed number, it sends a response signal modulated at frequency _f2 to the control station 1, and thereafter a call is made between the two. During this time, the other terminal stations 3B to 3X cannot communicate with the control station 1.

On the other hand, FIG. 2 shows a communication form in an emergency such as a disaster. In this case, under the control of the control station 1, a single wireless relay device 2 in the relay station 2
1 and 22 are both in the operating state. At this time, the terminal stations 3A to 3X are divided into two groups according to instructions from the control station 1: a group using normal waves and a group using backup waves. Assuming that the terminal stations that use normal waves are two terminal stations 3A and 3B, and the other terminal stations 3C to 3X use backup waves, for example, the communication between the terminal station 3A and the control station 1 and Terminal station 3 in parallel
Different types of communication can be performed between C and the control station 1.

By the way, in communications during emergencies such as disasters, communication between the control station and the terminal stations may be temporarily disabled due to line failures, equipment failures, or commercial power supply failures. In such a case, the operator of the terminal station that has become unable to communicate will forcibly switch the frequency channel of the radio from the normal wave to the backup wave, or from the backup wave to the normal wave, and conduct a mutual conversation with the control station. I was checking the channel status of the station. Of course, this channel switching cannot be confirmed if another channel is being used by another terminal station. Therefore, the operator of the terminal station who switches channels has to wait until the end of the call, which goes against the labor-saving task of the person in charge. Furthermore, if an operational error occurs due to the inexperience of the person in charge, there is a risk that information will become redundant and the speed and accuracy of information transmission, which is the original purpose of disaster prevention, will be significantly impaired.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a disaster prevention administrative radio system in which channel switching is performed under the control of a control station.

The present invention achieves the above-mentioned purpose by providing a verification unit in the control station to verify radio frequencies, and when it is determined that a different signal has been received, the terminal station sends a switching signal to switch the channel of the terminal station. do.

The present invention will be explained in detail with reference to Examples below.

Parts that are the same as those in Figure 1 are designated by the same symbols in Figure 3.
The figure is for explaining the disaster prevention administrative radio system in the case where channel switching is performed between an arbitrary terminal station 3N and a control station.

The control station is equipped with signal equipment having the same configuration, corresponding to each terminal station within a single wireless system municipal block. To explain this about the signal device 12N corresponding to the terminal station 3N, the signal device 12
N is composed of a signal device 12N1 for the normal wave route and a signal device 12N2 for the backup wave route. The signal device 12N1 for the normal wave route includes a signal detection unit 121 that detects a signal sent from the terminal station 3N;
It includes a registered station verification section 122 for performing frequency verification and a signal transmission section 123 for transmitting verification results to the single radio relay station 2. Similarly, the signal device 12N2 for the protection wave route also includes a signal detection unit 124,
It includes a registered station verification section 125 and a signal transmission section 126.

On the other hand, a handset 3 for telephone calls is located inside the terminal station 3N.
1. A switch 32 that operates in conjunction with the handset; a signal transmitter 3 that transmits a calling signal when receiving a signal from the switch 32;
3. Single wireless relay station 2 transmits call signal and call tone
a transmitter 34 that sends out signals to the single wireless relay station 2, a receiver 35 that receives signals sent from the single wireless relay station 2, and a receiver 3
A signal detection section 36 detects a switching signal output from the transmitter 34 and a channel switching section 37 switches the channels of the transmitter 34 and the receiver 35 when the signal detection section 35 detects the switching signal.
Further, the single radio relay device 21 for normal waves includes a receiver 211 for normal waves and a transmitter 212 for normal waves, and the single radio relay device 22 for backup waves includes a receiver 221 for backup waves and a receiver 221 for backup waves. It is equipped with a transmitter 222 for waves.

In this disaster prevention administrative radio system, each terminal station has a normal wave and a backup wave, but cannot use them at the same time, and only uses one wave as instructed by the control table 11 in the control station 1. Can be done.
Currently, terminal station 3N is using normal waves and is temporarily unable to communicate, and during that time, control station 1
Suppose that the communication with a group including the group is switched from using normal waves to using backup waves. control stand 1
1 sends a signal from the exchange 13 to the signal device 12N1 for the normal wave route and the signal device 12N2 for the backup wave route at the stage of transitioning to the use of the backup wave, and sends a signal to the registration station collation unit 122 via a circuit part not shown. ,12
The information indicating the ``normal wave usage status'' written in 5 is rewritten to the information indicating the ``preparation wave usage status.'' In this state, when the operator of the terminal station 3N lifts up the telephone handset 31, the switch 32
operates and the earth signal is supplied to the signal sending section 33. In response, the signal sending section 33 supplies a calling signal specific to the terminal station 3N to the transmitter 34.

This calling signal passes through the transmitter 34 and the normal wave receiver 211, enters the signal detection unit 121 in the control station, and is detected there. The detected calling signal is sent to the registration station verification section 122. In this state, the registration station verification section 122, in which information indicating the "backup wave usage state" is recorded as verification information, determines a detection error as a verification result, and immediately sends the signal to the signal transmission section 122.
Sends a line restoration instruction signal to. Signal sending unit 12
When receiving the line restoration instruction signal, the line 3 outputs a signal for line restoration and subsequently a protection wave switching signal.

The idle signal and the backup wave switching signal are supplied to the signal detection unit 36 through the normal wave transmitter 212 and the receiver 35 in the terminal station 3N. When the signal detection section 36 detects the preliminary wave switching signal, the signal detection section 36 switches the channel switching section 3.
A backup wave switching instruction signal is output to 7. Based on this, the channel switching unit 37 immediately switches the transmitter 34 and the receiver 35 to the backup wave use state.

By the way, even if this terminal station 3N does not use the line itself in this way, if another terminal station using normal waves in the same single radio system municipal block 3 makes a call, the signal sending unit 123 A protection wave switching signal is sent out along with a idle line signal for line restoration. Therefore, in such a case, the terminal station 3N can switch to the backup wave in advance.

Next, if the control station 1 returns the communication with the group including the terminal station 3N from the state of using backup waves to the state of using normal waves, the control station 1 will use the normal wave route from the exchange 13 to the terminal station 3N. Signal device 1
2N1 and a signal device 12N2 for the protection wave route. And the registration authority verification unit 122,1
The information indicating the ``preparation wave usage status'' written in 25 is rewritten to the information indicating the ``normal wave usage status.''

Assume that in this state, the terminal station 3N has not switched from the state of using the backup wave to the state of using the normal wave.
When the operator of the terminal station 3N picks up the handset 31, the hook switch 32 operates and a calling signal unique to the terminal station 3N is sent out from the transmitter 34 which is in the state of using the protection wave. The calling signal passes through the backup wave receiver 221 and enters the signal detection section 124 for the terminal station 3N, where it is detected and sent to the registered station verification section 125. Information indicating the "normal wave usage state" is recorded in the registered station verification section 125 as verification information. Therefore, the registered station verification unit 125 sends out a line restoration instruction signal in the same manner as described above, and the signal sending unit 126
Based on this, outputs a blank line signal and a normal wave switching restoration signal.

The idle signal and the normal wave switching restoration signal are supplied to the signal detection unit 36 through the backup wave transmitter 222 and the receiver 35 in the terminal station 3N, and the signal detection unit detects the normal wave switching restoration instruction signal based on this. is supplied to the channel switching section 37. Based on this, the channel switching unit 37 immediately restores the transmitter 34 and receiver 35 to the normal wave usage state.

As described above, according to the present invention, even if a temporary line failure or commercial power supply failure occurs, the control station can always direct each terminal station to the correct channel without requiring the hands of municipal terminal station operators. It can be positioned in

[Brief explanation of the drawing]

FIG. 1 is a system configuration diagram for explaining the operation of the disaster prevention administrative radio system at all times, FIG. 2 is a system configuration diagram for explaining the operation of the disaster prevention administrative radio system during disasters, and FIG. FIG. 3 is a block diagram showing the main parts of the system to explain the flow of control signals between the control station and the terminal station 3N in one embodiment. 1... Control station, 3... Single wireless municipal block, 3A to 3X... Terminal station, 33... Signal transmitter, 34... Transmitter, 35... Receiver, 36...
Signal detection section, 37... Channel switching section, 12
1,124...signal detection section, 122,125...
Registration station verification unit, 123, 126...signal sending unit.

Claims (1)

[Claims] 1 Multiple terminal stations constitute one administrative block, and during normal times, one frequency of a single communication channel is shared by all of these terminal stations, while administrative control is provided in the event of an emergency such as a disaster. A group of terminal stations sharing the above-mentioned frequency and a spare one under the control of the station.
In a disaster prevention administrative radio system, the terminal stations in the block described above are divided into two groups of terminal stations that share the frequency, and each terminal station communicates with the control station and the terminal station using a given frequency. a signal detection unit that detects the unique signal that is sent;
When the registration verification unit registers the frequency currently used by each terminal station and collates the registered frequency with the frequency currently used by the terminal station from which the unique signal has been sent, and the verification results do not match. A signal sending section that sends a switching signal to the terminal station is provided in the control station, and a signal sending section that sends a signal specific to that terminal station to each terminal station and a signal sending section that detects the switching signal sent from the control station are provided. a signal detection unit that sends a signal instructing switching to a desired channel;
A channel switching unit is provided that switches the transmission and reception frequency to another frequency using the signal given from the signal detection unit, and each terminal station switches to the frequency of each terminal station registered in the registration verification unit under the control of the control station. Disaster prevention administrative radio system signaling system characterized by being set.