JP2021051490A - Radio system - Google Patents

Abstract

To provide a radio system capable of facilitating maintenance management by monitoring an operational state of a system while rapidly notifying residents of abnormality of a monitoring target.SOLUTION: A radio system is used as a municipal disaster prevention broadcast wireless communication system, and comprises: a transmitter 10 which comprises a sensor 11 for monitoring a monitoring target and transmits sensor data by using LPWA; and a receiver 20 which performs control to a master station facility 30 to output a report to a slave station facility 4 by using previously stored voice data for report when detecting abnormality by receiving the sensor data and comparing it with a threshold, in which the master station facility 30 comprises a state display part 35 and displays an alarm based on the control from the receiver 20.SELECTED DRAWING: Figure 1

Description

The present invention relates to a wireless system used for disaster prevention administrative radio, etc., and in particular, a wireless system capable of promptly notifying residents of an abnormality to be monitored and monitoring the operating state of the system to facilitate maintenance management. Regarding.

[Explanation of Prior Art: Fig. 8]
A wireless system used for a conventional municipal disaster prevention broadcast radio or the like will be described with reference to FIG. FIG. 8 is an explanatory diagram showing a schematic configuration of a conventional wireless system.
As shown in FIG. 8, the conventional wireless system includes a master station facility 3 installed in a government building where a department in charge of disaster prevention work such as a city hall is located, and a plurality of slave station facilities 4 provided in various places in the city. I have.
Although only one slave station facility 4 is shown in FIG. 8, a plurality of slave station facilities 4 are actually provided.

The master station equipment 3 is operated by a person in charge of administration or the like, converts the input voice into a digital signal, and wirelessly transmits the input voice to a plurality of slave station equipment 4 by a simultaneous report (broadcast).
The slave station equipment 4 receives the voice data transmitted from the master station equipment 3 and outputs it as voice, and is installed outdoors to output a wide range of voice loudness to an outdoor loudspeaker station or to each home. There is a door-to-door receiver to be installed.

Such a conventional wireless system has an automatic notification function that broadcasts voice data stored in the master station equipment 3 at a preset time, but automatically reports suddenly. It is not something that can be reported.

In addition, conventionally, disaster prevention weather information on floods, sediment-related disasters, etc. is distributed from the Japan Meteorological Agency, and based on the information, the person in charge reports to various places by the disaster prevention administrative radio.
Therefore, there is a delay from delivery to notification, and it is not possible to report the actual water level status and slope status in a river in real time.

[Remote monitoring system]
Further, as another wireless system, there is a remote monitoring system (sensor network) in which a sensor for monitoring an object is installed and remote monitoring is performed wirelessly.
The remote monitoring system is used for various purposes such as temperature and humidity monitoring, lighting and air conditioning control in stores, power monitoring in buildings and factories, automatic operation control, etc. Some are monitored.

In the remote monitoring system, a plurality of sensor terminals transmit the acquired sensor data to the master station by wireless communication, the master station transmits the sensor data to the server by wire or wirelessly, and the server accumulates the data and from the outside. It is designed to be viewed and displayed in response to the request of.

Here, for communication between the sensor terminal and the master station, a long-distance wireless communication standard called LPWA (Low Power Wide Area) is used so that a wide range of sensor terminals can be connected to one master station.
The sensor terminal is usually battery-powered so that the installation location is not limited, and is required to have low power consumption so that it can withstand long-term operation.

LPWA is capable of long-distance wireless transmission while having low power consumption, and a sensor terminal using LoRa (Long Range) modulation is known. In the sensor terminal, uplink communication to the master station is the main, and the reception function is not normally used, so that power consumption can be reduced.

[Related technology]
As conventional techniques relating to disaster prevention administrative radio, JP-A-2013-150297 "Wireless Communication System" (Patent Document 1), JP-A-2016-127528 "Communication System and Communication Device" (Patent Document 2), Kai 2018-022509, “Bidirectional Information Distribution System” (Patent Document 3)
There is.

Patent Document 1 describes the contents of broadcasts such as emergency broadcasts performed by the municipal disaster prevention broadcast wireless communication system by connecting the slave station of the municipal disaster prevention broadcast wireless communication system to the master station of the regional promotion wireless communication system. It is described that it will also be broadcast in the regional signal wireless communication system.

In Patent Document 2, when a lower station transmits a notification signal to a higher station in a district broadcasting system or a disaster prevention radio system, the higher station notifies the lower station that the notification signal has been normally received by the higher station. It is stated that.

Further, Patent Document 3 describes an interactive information distribution system that distributes necessary information to residents via an Internet network or a regional intranet, and enables residents to post necessary information. There is.

Japanese Unexamined Patent Publication No. 2013-150297 Japanese Unexamined Patent Publication No. 2016-127528 Japanese Unexamined Patent Publication No. 2018-022509

However, with the conventional wireless system, even if disaster prevention weather information is delivered, it takes time for the person in charge to actually make a report from the master station equipment 3, and the actual water level and slope of the river where there is a risk of disaster. There was a problem that it was not possible to promptly report the situation.

It should be noted that Patent Documents 1 to 3 do not describe that when the sensor data detected by the sensor exceeds the threshold value, the master station equipment automatically notifies the slave station equipment.

The present invention has been made in view of the above circumstances, and can promptly notify the residents in the event of an abnormality based on the actual conditions of the water level and slope of the river, and further monitor the operating state of the system for maintenance management. It is an object of the present invention to provide a wireless system capable of facilitating.

The present invention for solving the problems of the above-mentioned conventional example is a wireless system including a master station facility for broadcasting voice data and a plurality of slave station facilities for receiving voice data and outputting voice. It has a transmitter that acquires sensor data from a sensor that detects the state of the monitoring target and wirelessly transmits the sensor data, and a receiver that is connected to the master station equipment and receives the wirelessly transmitted sensor data. However, the receiver is characterized in that when the received sensor data exceeds a preset threshold value, the master station equipment is controlled to broadcast the voice data stored in advance.

Further, in the above wireless system, the master station equipment includes a status display unit for displaying the status of each unit in the system, displays an alarm on the status display unit based on control from the receiver, and receives the receiver. However, it is characterized in that information indicating the state of each part is periodically output to the master station equipment.

Further, in the above wireless system, when the transmitter acquires the sensor data, the present invention requests the sensor data from the sensor, and if there is no response within a preset time, the request is re-requested. When the sensor data cannot be acquired even if the request is made a predetermined number of times preset, the information indicating that the sensor is in a failed state is wirelessly transmitted to the receiver, and the receiver sends the request to the master station equipment. Therefore, the state display unit is controlled so as to display an alarm indicating that the sensor is in a failed state.

Further, in the above wireless system, if the receiver does not receive the next wireless signal within a preset time after receiving the wireless signal from the transmitter, the transmitter fails. It is characterized in that it determines that it is in a state and controls the master station equipment so that the state display unit displays an alarm indicating that the transmitter is in a failed state.

Further, according to the present invention, in the above wireless system, when the master station equipment does not receive the next information within a preset time after receiving the information indicating the state from the receiver, the receiver Is determined to be in a faulty state, and an alarm indicating that the receiver is in a faulty state is displayed on the status display unit.

According to the present invention, it is a wireless system including a master station equipment that broadcasts voice data and a plurality of slave station equipment that receives voice data and outputs voice, and detects a state to be monitored. It has a transmitter that acquires sensor data from a sensor and wirelessly transmits the sensor data, and a receiver that is connected to the master station equipment and receives the wirelessly transmitted sensor data. Since the wireless system controls the master station equipment to broadcast the pre-stored voice data when the data exceeds a preset threshold, even if there is no information or instructions from the Meteorological Agency or municipalities. It has the effect of being able to promptly notify the slave station facilities and notify the residents according to the actual water level of the river and the condition of the slope.

Further, according to the present invention, the master station equipment includes a status display unit that displays the status of each unit in the system, displays an alarm on the status display unit based on control from the receiver, and the receiver displays each unit. Since the above wireless system periodically outputs information indicating the status of the above to the master station equipment, the person in charge can quickly grasp the faulty part and deal with it, facilitate maintenance management, and system reliability. Has the effect of improving.

It is explanatory drawing which shows the schematic structure of this wireless system. It is a block diagram which shows the schematic structure of the master station 30. It is explanatory drawing which shows the sequence example of system condition monitoring and water level monitoring in this wireless system. It is explanatory drawing which shows the sequence when a sensor fails. It is explanatory drawing which shows the sequence of failure detection in a receiver. It is explanatory drawing which shows the sequence of failure detection in a master station equipment. It is a flowchart which shows the process in the control part 22 of a receiver 20. It is explanatory drawing which shows the schematic structure of the conventional wireless system.

Embodiments of the present invention will be described with reference to the drawings.
[Outline of Embodiment]
The wireless system according to the embodiment of the present invention (the present wireless system) is used as a municipal disaster prevention broadcast wireless communication system, and a transmitter equipped with a sensor for monitoring a monitoring target uses LPWA for sensor data from the sensor. When the receiver receives the sensor data and compares it with the threshold value to detect an abnormality, the master station equipment is notified and output to the slave station equipment using the notification voice data stored in advance. Control (contact control) is performed. For example, when the monitoring target such as the water level of a river exceeds the threshold and needs to be notified to the residents, the slave station device can be promptly notified and the residents can be notified. Can be notified to.

In addition, this wireless system is provided with an alarm display unit that displays the status (normal / failure) of system components such as sensors, transmitters, and receivers in the master station equipment. For example, the transmitter is transmitted from the sensor for a certain period of time. When the sensor data is not received, the sensor failure information is transmitted by LPWA, and when the receiver receives the information, the contact control is performed so that the master station equipment is displayed with an alarm of the sensor status. Failures of each part can be detected and displayed on the master station equipment, and the person in charge can recognize the defective part and take prompt action, facilitate system maintenance and management, and improve reliability. ..

[Rough configuration of wireless system according to the embodiment: FIG. 1]
The schematic configuration of this wireless system will be described with reference to FIG. FIG. 1 is an explanatory diagram showing a schematic configuration of this wireless system.
This wireless system is used as a municipal disaster prevention broadcast wireless communication system, and as shown in FIG. 1, a transmitter 10 installed in an area to be monitored and a receiver 20 connected to the master station equipment 30 by wire. It is equipped with a master station facility 30 and a slave station facility 4 provided in a government building such as a city hall.
Although only one slave station facility 4 is shown in FIG. 1, a plurality of slave station facilities 4 are actually provided.
Further, a plurality of transmitters 10 may be installed, or a plurality of sensors 11 may be provided in one transmitter 10.

Each part of this wireless system will be described.
The slave station equipment 4 is the same as the conventional one, and receives the voice data transmitted from the master station equipment 30 and outputs the voice. The slave station equipment 4 includes an outdoor loudspeaker station and a door-to-door receiver.
As in the conventional case, the master station equipment 30 can input voice to the slave station equipment 4 all at once, but as a feature of this system, the voice data to be reported is stored in advance. Therefore, according to an instruction (contact control) from the receiver 20, the slave station equipment 4 is notified all at once without being operated by the person in charge.
The configuration of the master station equipment 30 will be described later.

[Transmitter 10]
The transmitter 10 includes a sensor 11, a control unit 12, and a transmitter unit 13, and functions as a sensor terminal in a sensor network.
That is, the transmitter 10 acquires the sensor data to be monitored and periodically transmits it to the receiver 20.

Each part of the transmitter 10 will be described.
The sensor 11 monitors the monitoring target and acquires sensor data, and will be described here as a water level sensor. The sensor 11, which is a water level sensor, is provided in a river or the like, monitors the water level of the river, acquires sensor data (water level data), and outputs the sensor data (water level data) to the control unit 12.
When there are a plurality of monitoring targets such as water level and flow rate, a plurality of sensors 11 are provided, but for the sake of simplicity, only one is provided here.

The control unit 12 acquires water level data from the sensor 11 according to a transmission schedule stored in advance, attaches time information, outputs the data to the transmission unit 13, and causes the receiver 20 to transmit the data.
When the control unit 12 detects a failure of the sensor 11, the control unit 12 outputs state data indicating that fact to the transmission unit 13 and causes the receiver 20 to transmit the status data.
The transmission unit 13 attaches a predetermined header to the water level data and the state data, converts the data into a wireless communication format, and transmits the data to the receiver 20 by LPWA. When a plurality of transmitters 10 are provided in the system, they are transmitted with their own identification numbers.
In the present embodiment, the sensor 11 is built in the transmitter 10, but the sensor 11 does not necessarily have to be in the transmitter 10, and a sensor terminal different from the transmitter 10 is provided. May be good.

[Receiver 20]
The receiver 20 includes a receiver 21 and a control unit 20 to cause the master station equipment 30 to perform an operation corresponding to the situation based on the sensor data and the state data transmitted from the transmitter 10. It controls the contact points of.

Each part of the receiver 20 will be described.
The receiving unit 21 receives the radio signal transmitted from the transmitter 10 by LPWA, takes out the sensor data and the state data, and outputs the sensor data and the state data to the control unit 22.
The control unit 22 is a characteristic part of the wireless system, and performs contact control for causing the master station equipment 30 to perform a preset operation based on the sensor data and the state data from the reception unit 21.

For example, when the water level data received from the transmitter 10 is higher than the notification threshold value (threshold value) stored in advance, for example, voice data calling for evacuation of residents is output to the master station equipment 30. , Perform contact control.
The voice data is stored corresponding to the identification number of the transmitter 10. When a plurality of sensors 11 are provided in the transmitter 10, voice data is stored in each sensor 11.

Further, when the control unit 22 of the receiver 20 receives the state data from the transmitter 10, the control unit 22 performs contact control so that the master station equipment 30 displays the corresponding alarm.
Further, when the control unit 22 detects a failure of the transmitter 10, the control unit 22 performs contact control so as to display an alarm indicating that fact.

Furthermore, the receiver 20 of this wireless system adjusts the processing of the report based on the sensor data by using the information from the Japan Meteorological Agency. Specifically, as will be described later, the time from the detection of an abnormal value (exceeding the threshold value) of the sensor data to the notification is adjusted according to the precipitation data of the monitored area.

[Configuration of master station equipment 30: Fig. 2]
Next, the configuration of the master station equipment 30 will be described with reference to FIG. FIG. 2 is a block diagram showing a schematic configuration of the master station 30.
As shown in FIG. 2, the master station equipment 30 includes a microphone 31, a control unit 32, a radio unit 33, a storage unit 34, and a status display unit 35.
The microphone 31 converts the voice input by the person in charge into an electric signal as in the conventional case.
The wireless unit 33 wirelessly transmits the voice data for notification to the slave station equipment 4 in accordance with the instruction of the control unit 32.
The control unit 32 controls the entire master station equipment 30, and particularly reads voice data from the storage unit 34 and outputs it to the wireless unit 33 based on an instruction (contact control) input from the receiver 20. Or, an alarm is displayed on the status display unit 35.

The storage unit 34 stores voice data for reporting. As described above, when a plurality of transmitters 10 are provided, when a plurality of sensors 11 are provided, and when a plurality of threshold values corresponding to the sensors 11 are provided stepwise, the transmitters are provided. , Sensor, and threshold value are stored in the voice data. That is, a plurality of voice data are stored.

For example, the location (river name, point name) is specified by the identification number of the transmitter 10, the monitoring target (water level) is specified by the sensor 11, and the situation (exceeding the evacuation judgment water level) is determined by the threshold value (for example, evacuation judgment water level). Since it is specified, the corresponding audio data is generated and stored in advance.
In this example, voice data such as "The water level at the XX river XX point has exceeded the evacuation judgment water level. Those who take time to evacuate, such as the elderly, should start evacuating."

If another threshold value (for example, flood risk water level) is set for the same sensor 11, and the sensor data exceeds the threshold value, the water level at the XX river XX point exceeds the flood risk water level. Residents should immediately evacuate to a safe place. "

Further, as the threshold value of the sensor data, in the case of a river in which a water level indicating the danger of flood is set such as the above-mentioned "evacuation judgment water level", it may be used, or in the case of a river in which the water level is not set. In some cases, the water level may be set so that a disaster may occur, judging from past disasters.
Further, depending on the type of sensor, a threshold value may be set based on values such as the amount of water, the flow velocity acquired from the image of the surveillance camera, the river width, and the area of the water area.
Further, the threshold value may be an absolute value indicating a specific water level, or may be a ratio (percentage) to an arbitrary reference value.

The status display unit 35 is a characteristic part of the wireless system, and is a sensor 11, a transmitter (a component including a transmitter 10 excluding the sensor 11 and a receiver 21 of the receiver 20), and a receiver (receiver 20). The control unit 22) is a display unit indicating whether or not the control unit 22) is operating normally.
For example, as the state display unit 35, green and red LEDs (Light Emitting Diodes) are provided corresponding to each component, and if the state is normal, the control unit 32 lights green, and it must be normal. If there is a configuration (in case of failure), the red light is turned on or blinks.
In a simpler configuration, only the red LED may be provided corresponding to each part, the corresponding red LED may be turned off if the state is normal, and may be turned on or blinked if the state is not normal.

[System status monitoring and water level monitoring: Fig. 3]
Next, the operation in this wireless system will be described. FIG. 3 is an explanatory diagram showing an example of a sequence of system condition monitoring and water level monitoring in this wireless system.
As shown in FIG. 3, first, the control unit 12 of the transmitter 10 outputs a data request to the sensor 11 at a predetermined timing (S21).
Upon receiving the request, the sensor 11 outputs sensor data and responds (S22).
When the control unit 12 of the transmitter 10 receives the sensor data (water level data), the control unit 12 instructs the transmitter 13 to transmit the water level data (transmission control) (S23).
The transmission unit 13 adds a header to the water level data and wirelessly transmits it by LPWA (S24).

When the receiving unit 21 of the receiver 20 receives the wireless signal, the receiving unit 21 outputs the water level data to the control unit 22 by wire (S25), and the control unit 22 analyzes the received water level data and compares it with the threshold value (S26). If the threshold value is not exceeded, the contact point for notification is not controlled.

Then, when the control unit 22 receives the water level data within a certain time (for example, 3 minutes) from the previous reception of the water level data, the control unit 22 recognizes the system state as "normal" and controls the contact with the master station equipment 30. Perform (S27) and save the log (S28).
When the master station equipment 30 receives "normal" from the receiver 20, the master station equipment 30 sets the display of the status display unit 35 to normal (turns off the alarm) and ends (S29).

Further, the control unit 12 of the transmitter 10 waits for 1 minute (S30) after receiving the response in the process S22, and outputs the data request to the sensor 11 again (S31). The control unit 12 of the transmitter 10 requests data from the sensor 11 at 1-minute intervals.
Then, as described above, the water level data is responded from the sensor 11 (S32), wirelessly transmitted by LPWA from the transmitting unit 13 (S33, S34), received by the receiving unit 20, and the water level data is input to the control unit 22. (S35).

The control unit 22 of the receiver 20 analyzes the water level data and compares it with the threshold value (S36), and when the water level data continuously exceeds the threshold value a specific number of times (for example, 5 times), the master station equipment 30 is notified. Contact control is performed so as to make a report to the user (S37).
When a plurality of transmitters 10, a plurality of sensors 11, and a plurality of threshold values are provided, in the contact control of notification, the control unit 22 determines the identification number of the transmitter 10, the identification number of the sensor 11, and the applied threshold value. The information is attached and output to the control unit 32 of the master station equipment 30.

At the same time, the control unit 22 of the receiver 20 sets the system state to "normal", performs contact control on the master station equipment 30 (S38), and saves the log (S39).
In the contact control of notification, in order not to react to momentary noise or the like, the threshold value is exceeded a plurality of preset times in succession, instead of immediately reporting once the threshold value is exceeded. In some cases, the report is controlled.

When the contact point of the report is controlled from the receiver 20, the master station equipment 30 reads the corresponding voice data from the storage unit 34, outputs the corresponding voice data to the radio unit 33, and simultaneously transmits the corresponding voice data to the plurality of slave station equipment 4 (S40). ).
As a result, in this system, even if there is no distribution from the Japan Meteorological Agency, etc., if the water level of the river exceeds a preset threshold value, it can be immediately notified and the residents can be called for evacuation. is there.

When the master station equipment 30 receives "normal" from the receiver, the master station equipment 30 sets the display of the status display unit 35 to normal (turns off the alarm) and ends (S41).
Then, the control unit 12 of the transmitter 10 waits for 1 minute (S42) after the process S33, and outputs a data request (S43).
In this way, the condition monitoring and water level monitoring of this system are performed.

[Sequence when the sensor fails: Fig. 4]
Next, in this wireless system, a sequence when the sensor 11 fails will be described with reference to FIG. FIG. 4 is an explanatory diagram showing a sequence when the sensor fails.
As shown in FIG. 4, the control unit 12 of the transmitter 10 periodically (for example, at 1-minute intervals) transmits a data request to the sensor 11 (S41).
If there is no data response within a certain period of time, the control unit 12 transmits a second data request (S42), and if there is still no data response, the control unit 12 transmits a third data request (S43).

If there is no response from the sensor 11 to the third data request, the control unit 12 outputs the information of "water level sensor failure" to the transmission unit 13 (S44), and the transmission unit 13 wirelessly transmits by LPWA. (S45).
Then, the receiving unit 21 of the receiver 20 receives and transmits it to the control unit 22 by wire (S46), the control unit 22 recognizes the "water level sensor failure" (S47), and " The contact of "water level sensor failure" is controlled (contact control (state)) (S48).
Then, the date and time and the state are saved in a log (S49).

The control unit 32 of the master station equipment 30 receives contact control from the receiver 20 and causes an alarm display of the LED corresponding to the water level sensor of the status display unit 35 (S50). The alarm display, for example, turns on or blinks a red LED.
In this way, the sequence is performed when the sensor 11 fails.

[Failure detection in receiver: Fig. 5]
Next, the failure detection sequence in the receiver 20 will be described with reference to FIG. FIG. 5 is an explanatory diagram showing a failure detection sequence in the receiver.
As shown in FIG. 5, the control unit 22 of the receiver 20 waits for the water level data for a certain period of time (for example, 3 minutes) from the reception of the previous water level data (S61).

When 3 minutes have passed without inputting the water level data, the control unit 22 recognizes the "transmitter failure" (S62) and performs contact control of the "transmitter failure" to the master station equipment 30 (contact control (contact control (contact control (contact control)). State)) (S63), save the log (S64).
Here, the "transmitter" is a part that causes the water level data to not be input to the control unit 22 of the receiver 20, and each part (control unit 12 and transmission unit 13) of the transmitter 10 except the sensor 11 and. A component including a receiving unit 21 of the receiver 20 is shown.

Then, the control unit 32 of the master station equipment 30 causes the LED corresponding to the transmitter of the status display unit 35 to display an alarm (S65).
In this way, the failure detection in the receiver 20 is performed.

[Failure detection in master station equipment 30: FIG. 6]
Next, the failure detection sequence in the master station equipment 30 will be described with reference to FIG. FIG. 6 is an explanatory diagram showing a failure detection sequence in the master station equipment.
As shown in FIG. 6, the control unit 32 of the master station equipment 30 waits for contact control from the receiver 20 for a certain period of time (for example, 3 minutes) from the input of the previous contact control (S71).

If there is no contact control input even after 3 minutes have passed, the control unit 32 of the master station equipment 30 recognizes that "receiver has failed" and causes the LED corresponding to the receiver of the status display unit 35 to display an alarm ( S72).
Here, the "receiver" includes a control unit 22 of the receiver 20 and a control line through which contact control from the control unit 22 is transmitted.
In this way, the failure detection in the master station 30 is performed.

As shown in FIGS. 3, 4, 5, and 6, in this wireless system, a failure of the sensor 11, the transmitting unit, and the receiving unit can be detected and displayed on the status display unit 35 of the master station 30. It can facilitate the overall maintenance management.
In particular, when an alarm is displayed, the person in charge can quickly identify and deal with the failed component, recover the failed part early, reduce missing data, and trust the system. It is possible to improve the sex.

[Processing in the control unit of the receiver: FIG. 7]
Next, the processing in the control unit 22 of the receiver 20 will be described with reference to FIG. 7. FIG. 7 is a flowchart showing processing in the control unit 22 of the receiver 20.
As shown in FIG. 7, the control unit 22 of the receiver 20 attempts to receive data from the receiving unit 21 (S101), determines whether or not the data has been acquired normally (S102), and cannot acquire the data normally. (In the case of No), the process proceeds to process S111, and the information (“state”) indicating the “system state” held inside is set as “transmitter failure” (S111).
Then, the process shifts to processing S115, and state contact control is performed on the master station equipment 30 (S115). In this case, the "transmitter" is displayed as an alarm.

Further, when the data is normally received in the process S102 (in the case of Yes), the control unit 22 determines whether or not the received data is a "sensor failure" (S103), and if it is a "sensor failure" (in the case of Yes). (In the case of Yes), the control unit 22 sets the “state” held inside as “water level sensor failure”, shifts to the process S115, and controls the contact of the state in the master station equipment 30 (S115). In this case, the water level sensor displays an alarm.

If the data is not "sensor failure" in the process 103 (No), the control unit 22 recognizes that the sensor data (water level data) has been received, and determines whether the water level data exceeds the threshold value. (S104).
When the threshold value is not exceeded in the process S104 (No), the control unit 22 shifts to the process S108, sets the "state" held inside to "normal" (S108), and sets the master station equipment 30. The contact control of the state is performed (S115). In this case, the alarm is not displayed.

When the sensor data exceeds the threshold value in the process S104 (in the case of Yes), the control unit 22 refers to the log (S105) and continuously exceeds the threshold value a predetermined number of times (for example, 5 times) set in advance. It is determined whether or not the threshold value is satisfied (S106), and if the values are not continuously exceeded (No), the process proceeds to the process S108.

If the threshold value is continuously exceeded a specific number of times in the process S106 (in the case of Yes), the control unit 22 controls the contact so as to notify the master station equipment 30 (S107), and shifts to the process S108.

When the contact control is performed in the process S115, the control unit 22 saves the time, state, and sensor data as a log (S116).
In this way, the processing in the control unit 22 of the receiver 20 is performed. The process of FIG. 7 is performed at a predetermined specific time interval (for example, every 3 minutes).

Further, here, the contact control of the notification is performed when the threshold value is exceeded 5 times in a row, but the number of consecutive times in which the threshold value is exceeded until the notification may be dynamically set according to the weather.
For example, if heavy rainfall is occurring or expected in the target area based on the precipitation forecast from the Japan Meteorological Agency (AMEDAS, high-resolution precipitation nowcast, short-term precipitation forecast, etc.), the number of consecutive times should be reduced ( It is possible to increase the number of consecutive times (for example, 10 times) when precipitation is not expected (for example, 3 times).

[Effect of Embodiment]
According to this wireless system, a transmitter 10 equipped with a sensor 11 that monitors a monitoring target, which is used as a municipal disaster prevention broadcast wireless communication system, transmits sensor data using LPWA, and a receiver 20 transmits sensor data. When an abnormality is detected by comparing with the threshold value, contact control is performed so that the master station equipment 30 is notified and output to the slave station equipment 4 using the notification voice data stored in advance. For example, when the monitoring target such as the water level of a river exceeds the threshold value and it is necessary to notify the residents, it is possible to promptly notify the slave station facility 4 without the person in charge manually making a report, and the residents can be notified. There is an effect that can be notified to.

Further, according to this wireless system, the master station equipment 30 is provided with a status display unit 35 for displaying the status (normal / fault) of system components such as a sensor 11, a transmitter, and a receiver. For example, the transmitter 10 is provided. Does not receive the sensor data from the sensor 11 for a certain period of time, transmits the information of "sensor failure" by LPWA, and when the receiver 20 receives the information, the sensor fails with respect to the master station equipment 30. The contact is controlled so that an alarm indicating the state is displayed, a failure of each part can be detected and displayed on the master station equipment 30, and the person in charge can recognize the defective part and take prompt action. It has the effect of facilitating system maintenance and improving reliability.

Further, although the water level sensor has been described in the above-mentioned example, a necessary sensor may be provided according to the place where the water level sensor is installed. For example, a sensor for detecting the movement of earth and sand on a slope may be provided in preparation for a sediment-related disaster. May be good.

Further, the disaster prevention weather information from the Japan Meteorological Agency and the evacuation information issued by the local government are input to the receiver 20, and the control unit 22 performs contact control based on the disaster prevention weather information and the evacuation information to perform contact control of the master station equipment. You may have 30 report.
For example, the control unit 22 is equipped with AI (Artificial Intelligence) that has learned a large amount of disaster prevention information and evacuation information, analyzes the distributed text information and voice information, and based on the analysis result, the master station equipment 30 Output the message corresponding to the delivered information.
As a voice message corresponding to disaster prevention weather information, there is "a heavy rain warning was announced in the eastern part of △△ prefecture".
In addition, as a voice message corresponding to evacuation information, there is an evacuation advisory issued in △ city XX ward. It is alert level 4. Please evacuate everyone.

The present invention is suitable for a wireless system capable of promptly notifying residents of an abnormality to be monitored and monitoring the operating state of the system to facilitate maintenance.

3,30 ... master station equipment, 4 ... slave station equipment, 10 ... transmitter, 20 ... receiver, 11 ... sensor, 12 ... control unit (transmitter), 13 ... transmitter, 21 ... receiver, 22 ... control Unit (receiver), 31 ... microphone, 32 ... control unit (master station equipment), 33 ... wireless unit, 34 ... storage unit, 35 ... status display unit

Claims (5)

A wireless system including a master station equipment that broadcasts audio data and a plurality of slave station equipment that receives the audio data and outputs audio.
A transmitter that acquires sensor data from a sensor that detects the state of the monitoring target and wirelessly transmits the sensor data,
It has a receiver that is connected to the master station equipment and receives the wirelessly transmitted sensor data.
A wireless system characterized in that the receiver controls the master station equipment to broadcast voice data stored in advance when the received sensor data exceeds a preset threshold value. The master station equipment is provided with a status display unit that displays the status of each part in the system, and displays an alarm on the status display unit based on control from the receiver.
The wireless system according to claim 1, wherein the receiver periodically outputs information indicating the state of each part to the master station equipment. When the transmitter acquires the sensor data, it requests the sensor data from the sensor, and if there is no response within the preset time, the request is made again and the request is specified in advance. If the sensor data cannot be acquired even after performing the number of times, information indicating that the sensor is in a failed state is wirelessly transmitted to the receiver.
The wireless system according to claim 2, wherein the receiver controls the master station equipment so that the status display unit displays an alarm indicating that the sensor is in a failed state. If the receiver does not receive the next radio signal within a preset time after receiving the radio signal from the transmitter, it determines that the transmitter is in a failed state and the master station. The wireless system according to claim 2 or 3, wherein the equipment is controlled so that the status display unit displays an alarm indicating that the transmitter is in a failed state. If the master station equipment does not receive the next information within a preset time after receiving the information indicating the status from the receiver, it determines that the receiver is in a faulty state. The wireless system according to any one of claims 2 to 4, wherein an alarm indicating that the receiver is in a failure state is displayed on the status display unit.

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