JP2022052386A - Wireless surveillance system - Google Patents

Abstract

To help an administrator of a wireless surveillance system to identify a cause of an occurred abnormality before visiting a site where the sensor is installed.SOLUTION: A wireless surveillance system (10) comprises a plurality of sensor units (SU1, SU2) and a controller (20). A first sensor unit (SU1) is activated from an idle state in response to a first transmission time and transitions to an idle state after wirelessly transmitting a first predetermined signal including information on the first transmission time. A second sensor unit (SU2) is activated from an idle state in response to the first transmission time, transitions to an idle state after receiving the first predetermined signal, is activated from an idle state in response to a second transmission time, and transitions to an idle state after wirelessly transmitting a second predetermined signal including information on a condition when the first predetermined signal was received. The controller determines conditions of the plurality of sensor units from the received first predetermined signal and second predetermined signal and reports the determination result.SELECTED DRAWING: Figure 1

Description

The present invention relates to a wireless monitoring system that wirelessly transmits and receives detection results by a sensor.

Conventionally, a plurality of intrusion detection units that detect an intruder and wirelessly transmit intrusion information and wirelessly transmit a normal operation signal at regular intervals, and an alarm information to a mobile terminal based on the intrusion information received from the intrusion detection unit. There is a wireless monitoring system including a monitoring unit for wireless transmission (see Patent Document 1). In the wireless monitoring system described in Patent Document 1, if the monitoring unit cannot confirm the reception of the normal operation signal at regular time intervals, the monitoring unit determines that the intrusion detection unit has failed and wirelessly transmits the failure information to the mobile terminal. .. The administrator of the wireless monitoring system carries a mobile terminal, and when receiving the alarm information or the failure information, he / she goes to the site where the intrusion detection unit for the alarm information or the failure information is installed to deal with it.

Japanese Unexamined Patent Publication No. 2006-163659

By the way, in the wireless monitoring system described in Patent Document 1, when the mobile terminal receives the failure information, it is necessary for the administrator to go to the site where the intrusion detection unit is installed and check the situation. For this reason, it is necessary to determine the cause of failure of the intrusion detection unit on site, it takes a long time to respond locally, and it is necessary to anticipate various causes of failure and carry many devices to the site.

It should be noted that this situation is generally common not only to the wireless monitoring system that detects an intruder but also to a wireless monitoring system that wirelessly transmits and receives the detection result by the sensor. In recent years, the number of sensors used has increased due to the demand for automation, and the above problem has become more prominent.

The present invention has been made to solve the above problems, and the main purpose thereof is to install a sensor in a wireless monitoring system for wirelessly transmitting and receiving detection results by a sensor when an abnormality occurs. The purpose is to make it easier to identify the cause of the abnormality before going to the site.

The first means for solving the above-mentioned problems is a wireless monitoring system.
A plurality of sensor units equipped with a sensor for performing a predetermined detection, which can wirelessly transmit the detection result of the sensor and shift to a hibernation state, and a plurality of sensor units.
A control unit that executes a predetermined process based on the detection results received from the plurality of sensor units, and a control unit.
It is a wireless monitoring system equipped with
The plurality of sensor units are activated from the hibernation state corresponding to the first transmission time, and after wirelessly transmitting a first predetermined signal including information on the first transmission time, the first sensor shifts to the hibernation state. After receiving the unit and the first predetermined signal transmitted by the first sensor unit wirelessly from the hibernation state corresponding to the first transmission timing, the unit and the first predetermined signal are transferred to the hibernation state, and the first predetermined signal is transmitted. The second predetermined signal including the information regarding the received state is included with the second sensor unit which starts from the hibernation state and wirelessly transmits the second predetermined signal corresponding to the second transmission time and then shifts to the hibernation state.
The control unit receives the first predetermined signal and the second predetermined signal from the plurality of sensor units, and determines the state of the plurality of sensor units based on the received first predetermined signal and the second predetermined signal. Judgment is made and the judgment result is notified.

According to the above configuration, the plurality of sensor units include a sensor that performs a predetermined detection, and can wirelessly transmit the detection result by the sensor and shift to the hibernation state. The control unit executes a predetermined process based on the detection results received from the plurality of sensor units. For example, the sensor is an open / close sensor that detects the open / closed state of the window, and when the control unit receives from the sensor unit that the window is in the open state, the control unit transmits an alarm signal.

The plurality of sensor units include a first sensor unit and a second sensor unit. The first sensor unit starts from the hibernation state in accordance with the first transmission time, transmits the first predetermined signal wirelessly, and then shifts to the hibernation state. Therefore, it is possible to suppress the power consumption of the first sensor unit when the first predetermined signal is not transmitted wirelessly. Here, the first predetermined signal includes information regarding the first transmission timing. Therefore, the second sensor unit can grasp the first transmission time based on the first predetermined signal. The second sensor unit may grasp the first transmission time based on the signal from the control unit that has received the first predetermined signal, or may directly receive the first predetermined signal and grasp the first transmission time. You may. The first sensor unit may be a sensor unit capable of only transmitting or a sensor unit capable of transmitting and receiving.

The second sensor unit is activated from the hibernation state corresponding to the first transmission time, and after receiving the first predetermined signal transmitted wirelessly by the first sensor unit, the second sensor unit shifts to the hibernation state. That is, the second sensor unit is activated at the transmission time when the first sensor unit wirelessly transmits the first predetermined signal, even if it is not the second transmission time when the first sensor unit wirelessly transmits the second predetermined signal. 1 The sensor unit shifts to the hibernation state after receiving the first predetermined signal transmitted wirelessly. Therefore, the second sensor unit itself receives the first predetermined signal wirelessly transmitted by the first sensor unit, such as whether or not the first predetermined signal is received from the first sensor unit, the strength of the received first predetermined signal, and the like. Can get information about the received status. Since the second sensor unit shifts to the hibernation state after receiving the first predetermined signal transmitted wirelessly by the first sensor unit, it suppresses the power consumption of the second sensor unit when the first predetermined signal is not received. Can be done.

Then, the second sensor unit activates the second predetermined signal including the information regarding the received state of the first predetermined signal from the hibernation state corresponding to the second transmission time, wirelessly transmits the second predetermined signal, and then shifts to the hibernation state. .. The control unit receives the first predetermined signal and the second predetermined signal from the plurality of sensor units, determines the state of the plurality of sensor units based on the received first predetermined signal and the second predetermined signal, and notifies the determination result. do. For example, the control unit can determine that some abnormality has occurred when the first predetermined signal is not received from the first sensor unit at the first transmission time. Further, the control unit determines the state of the first sensor unit after grasping the state in which the first sensor unit wirelessly transmits the first predetermined signal based on the second predetermined signal received from the second sensor unit. And the determination result can be notified. For example, the second predetermined signal includes information indicating whether or not the second sensor unit has received the first predetermined signal transmitted wirelessly by the first sensor unit, and the control unit receives the first predetermined signal from the first sensor unit. It is assumed that an abnormality that cannot be received occurs and the second sensor unit receives the first predetermined signal wirelessly transmitted by the first sensor unit. In this case, it is possible to exclude from the cause of abnormality that the first sensor unit does not transmit the first predetermined signal wirelessly. Therefore, the administrator of the wireless monitoring system can easily identify the cause of the abnormality before going to the site where the sensor unit is installed.

In the second means, the first sensor unit sets the first transmission time based on the pseudo-random number, and the information regarding the first transmission time is random number identification information that makes it possible to specify the generated pseudo-random number. Is.

According to the above configuration, the first sensor unit sets the first transmission time based on the pseudo-random number. Therefore, the first transmission timing can be changed each time, and the transmission timing (first transmission timing) of the first predetermined signal of the first sensor unit is the first predetermined signal or the second predetermined signal of the sensor unit other than itself. It is possible to suppress overlapping with the transmission time (first transmission time or second transmission time) of.

Here, the information regarding the first transmission timing is random number identification information that makes it possible to specify the generated pseudo-random number. Therefore, the second sensor unit can grasp the first transmission time based on the random number identification information included in the first predetermined signal. Therefore, even if the first transmission time is changed each time based on the pseudo-random number, the second sensor unit can specify the first transmission time and can be activated from the hibernation state corresponding to the first transmission time. can.

In the third means, the control unit specifies the first transmission time based on the random number identification information, wirelessly transmits the transmission time information including the specified first transmission time, and the second sensor unit. Receives the transmission timing information from the control unit. According to such a configuration, the control unit specifies the first transmission time based on the random number identification information and transmits the transmission time information, and the second sensor unit receives the transmission time information from the control unit to perform the first transmission. You can know the time.

In the fourth means, the second predetermined signal includes information regarding the second transmission timing, and the control unit identifies the first transmission timing based on the random number identification information, and the second sensor unit determines the first transmission timing. A first change signal that specifies the second transmission time based on the received second predetermined signal and changes the second transmission time when the specified first transmission time and the second transmission time overlap. The second sensor unit receives the first change signal from the control unit, and changes the second transmission timing based on the received first change signal. According to such a configuration, when the first transmission time and the second transmission time overlap, the first transmission time and the second transmission time are changed by changing the second transmission time of the second sensor unit capable of receiving the first change signal. It is possible to shift the transmission time.

In the fifth means, the control unit substitutes for the first predetermined signal on condition that the first predetermined signal is not received at the time when the first predetermined signal should be received from the first sensor unit. The second sensor unit wirelessly transmits a proxy reception signal instructing to receive the signal, and the second sensor unit is in the hibernation state corresponding to the first transmission timing on condition that the proxy reception signal is received from the control unit. The first sensor unit receives the first predetermined signal transmitted wirelessly.

According to the above configuration, the control unit receives the first predetermined signal on behalf of the first sensor unit on condition that the first predetermined signal is not received at the time when the first predetermined signal should be received. The proxy reception signal to be instructed is transmitted. Therefore, if the control unit does not receive the first predetermined signal at the time when the first predetermined signal should be received from the first sensor unit, the control unit instructs by the proxy reception signal to receive the first predetermined signal by proxy. can do. On the other hand, when the control unit receives the first predetermined signal at the time when the first predetermined signal should be received from the first sensor unit, the control unit does not wirelessly transmit the proxy reception signal.

Then, when the second sensor unit receives the proxy reception signal from the control unit, the second sensor unit is activated from the hibernation state corresponding to the first transmission time and receives the first predetermined signal wirelessly transmitted by the first sensor unit. .. On the other hand, when the second sensor unit does not receive the proxy reception signal from the control unit, the second sensor unit is activated from the hibernation state corresponding to the first transmission time and the first predetermined signal wirelessly transmitted by the first sensor unit. Do not receive. Therefore, when the control unit receives the first predetermined signal at the time when the first predetermined signal should be received from the first sensor unit, that is, when the first sensor unit is presumed to be normal, it corresponds to the first transmission time. It is possible to prevent the second sensor unit from starting from the hibernation state, and it is possible to suppress the power consumption of the second sensor unit.

In the sixth means, the second sensor unit is activated from the hibernation state each time in response to the first transmission time, and receives the first predetermined signal transmitted wirelessly by the first sensor unit. Therefore, the second sensor unit can acquire information regarding the state in which the first sensor unit has received the first predetermined signal wirelessly transmitted each time in accordance with the first transmission timing. Then, the control unit shall grasp the state in which the first sensor unit wirelessly transmits the first predetermined signal in accordance with the first transmission timing based on the second predetermined signal received from the second sensor unit. I can do it. Therefore, even if the first predetermined signal does not reach the control unit from the first sensor unit, the control unit can quickly grasp the state in which the first sensor unit wirelessly transmits the first predetermined signal.

The first transmission timing at which the first sensor unit transmits the first predetermined signal is set, for example, based on the time of the clock built in the first sensor unit. Therefore, if the time of the clock deviates from the correct time with the passage of time, the first transmission time also deviates from the correct first transmission time. In order to cope with this deviation of the first transmission time, when the second sensor unit is activated from the hibernation state corresponding to the first transmission time and the time for receiving the first predetermined signal is set to be long, the power of the second sensor unit is increased. Consumption will increase.

In this regard, in the seventh means, the control unit calculates the amount of time lag, which is the amount at which the time when the first sensor unit transmits the first predetermined signal shifts with the passage of time, and the second sensor. The second sensor unit wirelessly transmits correction information including a correction start time in which the time when the unit starts from the hibernation state corresponding to the first transmission time is corrected based on the time lag amount, and the second sensor unit controls the control. The correction information is received from the unit, and instead of the first transmission time, the correction start time is started from the hibernation state, and the first predetermined signal transmitted wirelessly by the first sensor unit is received. After that, the state shifts to the hibernation state. According to such a configuration, it is not necessary to set a long time for the second sensor unit to start from the hibernation state and receive the first predetermined signal corresponding to the first transmission time, so that the power consumption of the second sensor unit is increased. It is possible to suppress the increase.

In the eighth means, the determination result includes information indicating the first sensor unit that could not be confirmed to be transmitting the first predetermined signal, and the second sensor unit received by the control unit from the second sensor unit. 2 Includes a predetermined signal.

According to the above configuration, the determination result includes the second predetermined signal received by the control unit from the second sensor unit. The second predetermined signal includes information regarding a state in which the second sensor unit receives the first predetermined signal wirelessly transmitted by the first sensor unit. Therefore, the administrator of the wireless monitoring system can easily identify the cause of the abnormality based on the notified determination result, and can easily identify the cause of the abnormality before going to the site where the sensor unit is installed.

In the ninth means, the determination result can confirm that the information indicating the first sensor unit for which it was not possible to confirm that the first predetermined signal has been transmitted and the information indicating that the first predetermined signal has been transmitted can be confirmed. It includes the estimation result of estimating the cause of the abnormality of the first sensor unit that did not exist.

According to the above configuration, the determination result includes the estimation result of estimating the cause of the abnormality of the sensor unit for which it could not be confirmed that the first predetermined signal is being transmitted. Therefore, the administrator of the wireless monitoring system can know the estimation result of the cause of the abnormality from the notified determination result, and it becomes easy to identify the cause of the abnormality before going to the site where the sensor unit is installed.

In the tenth means, the control unit could not execute the process of receiving the second predetermined signal from the predetermined second sensor unit a plurality of times at the second transmission timing of the predetermined second sensor unit. When it occurs, a second change signal for changing the second transmission timing of the predetermined second sensor unit is wirelessly transmitted to the predetermined second sensor unit, and the predetermined second sensor unit is said to have the same. The second change signal is received from the control unit, and the second transmission timing of the predetermined second sensor unit is changed based on the received second change signal. According to such a configuration, by changing the second transmission timing of the predetermined second sensor unit, the control unit can determine the abnormality of the predetermined second sensor unit.

The block diagram which shows the controller and a plurality of sensor units. The figure which shows an example of the activation schedule of a sensor unit. The schematic diagram which shows the mode when the controller cannot receive a predetermined signal I1 in a low consumption mode. The schematic diagram which shows the mode when the controller cannot receive a predetermined signal I1 in a high precision mode. The schematic diagram which shows the mode when the predetermined signal I1 and the predetermined signal I2 overlap in the low consumption mode. The schematic diagram which shows the mode in the case where the controller could not execute the process of receiving a predetermined signal I2.

Hereinafter, an embodiment embodied in a wireless monitoring system for detecting illegal invasion into an office or a house will be described with reference to the drawings. As shown in FIG. 1, the wireless monitoring system 10 includes a controller 20 and sensor units SU1 and SU2 (a plurality of sensor units).

The controller 20 (control unit) wirelessly communicates with the sensor units SU1 and SU2 to perform a safety monitoring operation. The controller 20 includes a data processing unit 21, a wireless transmission unit 23, a wireless reception unit 24, and the like. The data processing unit 21 is composed of a microcomputer including a CPU, a ROM, a RAM, a storage device, an input / output interface, and the like. The wireless transmission unit 23 wirelessly transmits a signal to the sensor unit SU2 based on a command from the data processing unit 21. The wireless receiving unit 24 receives the signal wirelessly transmitted from the sensor units SU1 and SU2 and outputs the signal to the data processing unit 21.

Similarly, the sensor unit SU1 (first sensor unit) includes a data processing unit 31 and a wireless transmission unit 32. That is, the sensor unit SU1 is a transmission-only sensor unit that transmits signals and does not receive signals. The sensor unit SU1 includes a magnet sensor 34 and a sensor detection unit 35. The magnet sensor 34 (open / close sensor) is attached to, for example, an office window or door (door), detects that the window or door has been opened (predetermined detection), and outputs a signal. The sensor detection unit 35 inputs a signal from the magnet sensor 34 and outputs it to the data processing unit 31. When the data processing unit 31 inputs a signal from the sensor detection unit 35, the wireless transmission unit 32 wirelessly transmits the detection signal to the controller 20. The detection signal is a signal indicating that the window or door has been opened (predetermined state), and includes information (identification number, etc.) for identifying the sensor unit SU1.

The sensor unit SU1 operates by electric power supplied from a battery (not shown). In order to suppress battery consumption, the sensor unit SU1 is in a sleep state (hibernation state) except for a period in which a signal is transmitted. In the sleep state, the wireless transmission unit 32 is stopped (only a part of the functions of the sensor unit SU1 are operating), and the power consumption of the sensor unit SU1 is suppressed. When the magnet sensor 34 (own sensor) detects that the window or door has been opened, the sensor unit SU1 wakes up from the sleep state and enters a transmittable state (normal operating state), and wirelessly transmits the detection signal. The third process of shifting to the sleep state later is executed.

The sensor unit SU2 (second sensor unit) has the same configuration as the sensor unit SU1 except that it includes the wireless receiving unit 43, and executes the same processing as the sensor unit SU1. Specifically, the sensor unit SU2 corresponds to the data processing unit 31, the wireless transmission unit 32, the magnet sensor 34, and the sensor detection unit 35 of the sensor unit SU1, and corresponds to the data processing unit 41, the wireless transmission unit 42, and the magnet sensor. It includes 44 and a sensor detection unit 45. The wireless receiving unit 43 receives the signal wirelessly transmitted from the sensor unit SU1 and the controller 20 and outputs the signal to the data processing unit 41.

When the controller 20 receives the detection signal from any of the sensor units SU1 and SU2, the controller 20 notifies the center that monitors the operation of the wireless monitoring system 10 (predetermined processing) of the detection signal. The controller 20 may sound an alarm in the wireless monitoring system 10, give a warning by voice, or turn on a warning light as a predetermined process together with the notification to the center or instead of the notification to the center. good.

The administrator (worker) of the wireless monitoring system 10 sets transmission / reception so that the controller 20 and the sensor units SU1 and SU2 operate as follows when the wireless monitoring system 10 is installed.

That is, the sensor units SU1 and SU2 wirelessly transmit predetermined signals I1 (N1, T1) and I2 (N2, T2) including normal operation signals N1 and N2 and random number identification information T1 and T2, respectively.

The normal operation signals N1 and N2 are signals indicating that the sensor units SU1 and SU2 are operating normally, respectively, and include information (identification number and the like) for identifying the sensor units SU1 and SU2, respectively.

The sensor unit SU1 sets a first transmission time T1 (n), which is a time to transmit a predetermined signal I1 (N1, T1) (first predetermined signal), based on a pseudo-random number. That is, the first transmission time T1 (n) changes irregularly every time, but is predictable. The first transmission time T1 (n) is the nth first transmission time of the sensor unit SU1, and the first transmission time T1 (n + 1) is the (n + 1) first first transmission time of the sensor unit SU1.

As the pseudo-random number, for example, an M-sequence PN code can be adopted. The pseudo-random number with the PN code of the M sequence can be specified based on the number of stages of the shift register and the initial value. The random number specifying information T1 (information regarding the first transmission timing) includes the number of stages of the shift register and the initial value (information that enables the generated pseudo-random number to be specified). Similarly, the sensor unit SU2 sets the second transmission time T2 (n), which is the time to transmit the predetermined signal I2 (N2, T2), based on the pseudo-random number. The random number specifying information T2 (information regarding the second transmission timing) includes the number of stages of the shift register and the initial value (information that enables the generated pseudo-random number to be specified). The pseudo-random number is not limited to the PN code, and well-known algorithms such as the square numbering method, the linear congruential method, the Mersenne Twister, and Xorshift can be adopted.

After transmitting the predetermined signal I1 (N1, T1), the sensor unit SU1 immediately shifts to the sleep state. After transmitting the predetermined signal I2 (N2, T2), the sensor unit SU2 maintains a transmit / receive enable state for a certain period of time.

When the controller 20 receives the predetermined signal I2 (N2, T2) from the sensor unit SU2, the controller 20 wirelessly transmits the reception confirmation signal AC2. The reception confirmation signal AC2 is a signal indicating that a predetermined signal I2 (N2, T2) has been received from the sensor unit SU2, and includes information (identification number, etc.) for identifying the sensor unit SU2. After receiving the reception confirmation signal AC2, the sensor unit SU2 shifts to the sleep state.

In the present embodiment, the controller 20 does not receive the predetermined signal I1 (N1, T1) at the time when the predetermined signal I1 (N1, T1) should be received from the sensor unit SU1, provided that the controller 20 does not receive the predetermined signal I1 (N1). , T1) is wirelessly transmitted as a proxy reception signal D2 instructing the sensor unit SU2 to receive the proxy. The proxy reception signal D2 includes information (identification number, etc.) for identifying the sensor unit SU2. That is, if the controller 20 does not receive the predetermined signal I1 (N1, T1) at the time when the predetermined signal I1 (N1, T1) should be received from the sensor unit SU1, the controller 20 substitutes for the predetermined signal I1 (N1, T1). The sensor unit SU2 is instructed to receive by the proxy reception signal D2. On the other hand, when the controller 20 receives the predetermined signal I1 (N1, T1) at the time when the predetermined signal I1 (N1, T1) should be received from the sensor unit SU1, the controller 20 does not wirelessly transmit the proxy reception signal D2.

Here, the controller 20 specifies the first transmission time T1 (n) based on the random number identification information T1, and the reception confirmation signal AC2 (D2, T1 (n)) including the specified first transmission time T1 (n). Is transmitted wirelessly during the period in which the sensor unit SU2 is in a transmit / receive state. The sensor unit SU2 receives the reception confirmation signal AC2 (D2, T1 (n)) from the controller 20 during the period in which transmission / reception is possible. The reception confirmation signal AC2 (D2, T1 (n)) corresponds to the transmission timing information.

The sensor unit SU2 starts from the hibernation state corresponding to the first transmission time T1 (n) on condition that the proxy reception signal D2 included in the reception confirmation signal AC2 (D2, T1 (n)) is received from the controller 20. Upon activation, the sensor unit SU1 receives a predetermined signal I1 (N1, T1) transmitted wirelessly. That is, when the sensor unit SU2 receives the proxy reception signal D2 from the controller 20, the sensor unit SU2 is activated from the hibernation state corresponding to the first transmission timing T1 (n), and the predetermined signal I1 (which is wirelessly transmitted by the sensor unit SU1) ( Receives N1, T1). On the other hand, when the sensor unit SU2 does not receive the proxy reception signal D2 from the controller 20, the sensor unit SU2 is activated from the hibernation state corresponding to the first transmission time T1 (n), and the sensor unit SU1 wirelessly transmits the predetermined value. Do not receive the signal I1 (N1, T1).

The first transmission timing T1 (n) at which the sensor unit SU1 transmits a predetermined signal I1 (N1, T1) is set (based on the clock time) based on, for example, the time of the clock (clock) built in the sensor unit SU1. Will be done. Therefore, if the time of the clock deviates from the correct time with the passage of time, the first transmission time T1 (n) also deviates from the correct first transmission time T1 (n). In order to cope with the deviation of the first transmission time T1 (n), the time when the sensor unit SU2 is activated from the hibernation state corresponding to the first transmission time T1 (n) and receives the predetermined signal I1 (N1, T1). If is set long, the power consumption of the sensor unit SU2 will increase.

Therefore, the controller 20 calculates the time-lag amount Te1 which is the amount at which the time when the sensor unit SU1 transmits the predetermined signal I1 (N1, T1) shifts with the passage of time. For example, the sensor unit SU1 has a clock count number C1 from the previous transmission of the predetermined signal I1 (N1, T1) to the transmission of the predetermined signal I1 (N1, T1) this time by the built-in clock. (Elapsed time) is measured, and the predetermined signal I1 (N1, T1) is transmitted including the clock count number C1. The controller 20 receives a predetermined signal I1 (N1, T1) including a clock count number C1. The controller 20 uses the built-in clock to clock count Cc (elapsed time) from the previous reception of the predetermined signal I1 (N1, T1) to the reception of the predetermined signal I1 (N1, T1) this time. ) Is measured. The controller 20 calculates the time-dependent deviation amount Te1 based on the deviation between the clock count number C1 and the clock count number Cc.

Then, the controller 20 receives the reception confirmation including the correction start time T1r (n) in which the time when the sensor unit SU2 starts from the hibernation state corresponding to the first transmission time T1 (n) is corrected based on the time lag amount Te1. The signal AC2 (D2, T1r (n)) is transmitted wirelessly during the period in which the sensor unit SU2 is in a transmit / receive state. That is, in the controller 20, instead of the reception confirmation signal AC2 (D2, T1 (n)), the sensor unit SU2 receives the reception confirmation signal AC2 (D2, T1r (n)) including the correction start time T1r (n). Send wirelessly during the period when transmission and reception are possible. The reception confirmation signal AC2 (D2, T1r (n)) corresponds to the correction information.

The sensor unit SU2 receives the reception confirmation signal AC2 (D2, T1r (n)) from the controller 20 and starts from the hibernation state corresponding to the correction start time T1r (n) instead of the first transmission time T1 (n). Then, after the sensor unit SU1 receives the predetermined signals I1 (N1, T1) transmitted wirelessly, it shifts to the hibernation state. The sensor unit SU2 activates the predetermined signal I2 (N2, T2, A12) including the information A12 regarding the state of receiving the predetermined signal I1 (N1, T1) from the hibernation state corresponding to the second transmission time T2 (n). After transmitting wirelessly, it goes into hibernation. The information A12 is information indicating, for example, the intensity received by the sensor unit SU2 of the predetermined signals I1 (N1, T1) transmitted by the sensor unit SU1. The predetermined signal I2 (N2, T2, A12) corresponds to the second predetermined signal. With the above, the transmission / reception setting between the controller 20 and the sensor units SU1 and SU2 is completed.

FIG. 2 is a diagram showing an example of a start schedule of the sensor units SU1 and SU2.

The start schedule sets the time when the sensor units SU1 and SU2 each execute their own alarm (first process). The self-issue is activated from the sleep state at the time (transmission time) set by the sensor units SU1 and SU2 based on the pseudo-random numbers, and wirelessly transmits the predetermined signals I1 (N1, T1) and I2 (N2, T2), respectively. It is a process to shift to the sleep state after sending with.

For example, at the first transmission time T1 (n) set based on the pseudo-random number, the sensor unit SU1 is activated from the sleep state, and the sensor unit SU1 wirelessly transmits a predetermined signal I1 (N1, T1). The sensor unit SU2 continues to sleep.

At the second transmission time T2 (n) set based on the pseudo-random number, the sensor unit SU2 wakes up from the sleep state and wirelessly transmits the predetermined signal I2 (N2, T2). The sensor unit SU1 continues to sleep. After that, all the sensor units SU1 and SU2 go into the sleep state. Then, after the lapse of a predetermined time, the same process is repeated. The predetermined time can be set, for example, from several hours to 24 hours.

FIG. 3 is a schematic diagram showing a mode in which the controller cannot receive the predetermined signal I1 in the low consumption mode.

At the second transmission time T2 (n-1), the sensor unit SU2 transmits a predetermined signal I2 (N2, T2). When the controller 20 receives the predetermined signal I2 (N2, T2) from the sensor unit SU2, the controller 20 wirelessly transmits the reception confirmation signal AC2. Further, the controller 20 calculates the time-dependent deviation amount Te1 based on the deviation between the clock count number C1 and the clock count number Cc. When the sensor unit SU2 receives the reception confirmation signal AC2, it determines that the communication between itself and the controller 20 is normal, and shifts to the sleep state.

At the first transmission time T1 (n), the sensor unit SU1 transmits a predetermined signal I1 (N1, T1). When the controller 20 receives the predetermined signal I1 (N1, T1) from the sensor unit SU1, it determines that the communication between itself and the sensor unit SU1 is normal. The controller 20 does not wirelessly transmit the reception confirmation signal to the predetermined signals I1 (N1, T1) from the sensor unit SU1. After that, the sensor units SU1 and SU2 repeat the transmission of the predetermined signals I1 (N1, T1) and I2 (N2, T2). Further, the controller 20 calculates the time-dependent deviation amount Te1 based on the deviation between the clock count number C1 and the clock count number Cc.

Here, at the first transmission time T1 (n + k), the sensor unit SU1 transmits a predetermined signal I1 (N1, T1). It is assumed that the controller 20 cannot receive the predetermined signal I1 (N1, T1) transmitted by the sensor unit SU1.

At the second transmission time T2 (n + k), the sensor unit SU2 transmits a predetermined signal I2 (N2, T2). The controller 20 calculates a correction start time T1r (n + k + 1) in which the time when the sensor unit SU2 starts from the hibernation state corresponding to the first transmission time T1 (n + k + 1) is corrected based on the time lag amount Te1. When the controller 20 receives the predetermined signal I2 (N2, T2) from the sensor unit SU2, the controller 20 includes the proxy reception signal D2 and the correction start time T1r (n + k + 1) in the reception confirmation signal AC2, and receives the reception confirmation signal AC2 (D2, T1r). (N + k + 1)) is transmitted wirelessly. The sensor unit SU2 receives the reception confirmation signal AC2 (D2, T1r (n + k + 1)). The reception confirmation signal AC2, the proxy reception signal D2, and the correction start time T1r (n + k + 1) can also be transmitted as individual signals.

The sensor unit SU2 is started from the hibernation state corresponding to the correction start time T1r (n + k + 1) on condition that the substitute reception signal D2 included in the reception confirmation signal AC2 (D2, T1r (n + k + 1)) is received from the controller 20. Then, the predetermined signal I1 (N1, T1) wirelessly transmitted by the sensor unit SU1 is received on behalf of the first transmission timing T1 (n + k + 1). It is assumed that the controller 20 cannot receive the predetermined signals I1 (N1, T1) transmitted by the sensor unit SU1.

At the second transmission time T2 (n + k + 1), the sensor unit SU2 transmits a predetermined signal I2 (N2, T2, A12). The information A12 is information indicating the strength with which the sensor unit SU2 has received the predetermined signals I1 (N1, T1). The controller 20 receives a predetermined signal I2 (N2, T2, A12) from the sensor unit SU2. Here, the information A12 indicates that the intensity of the predetermined signal I1 (N1, T1) received by the sensor unit SU2 is larger than the predetermined intensity, that is, the sensor unit SU2 normally receives the predetermined signal I1 (N1, T1). Is shown. When the controller 20 receives the predetermined signal I2 (N2, T2, A12) from the sensor unit SU2, the controller 20 includes information indicating the sensor unit SU1 that could not be confirmed to be transmitting the predetermined signal I1 (N1, T1). , Notify the center of the predetermined signal I2 (N2, T2, A12). That is, the controller 20 receives predetermined signals I1 and I2 from the sensor units SU1 and SU2, determines an abnormality (state) of the sensor units SU1 and SU2 based on the received predetermined signals I1 and I2, and sends the determination result to the center. Notify (notify).

The information A12 indicating the strength at which the sensor unit SU2 has received the predetermined signal I1 (N1, T1) is whether or not the sensor unit SU1 other than itself has received the predetermined signal I1 (N1, T1) wirelessly transmitted. It can be said that it is information indicating the above. For example, the information A12≈0 (<detectable intensity) indicating that the intensity of the predetermined signal I1 (N1, T1) wirelessly transmitted by the sensor unit SU1 received by the sensor unit SU2 is approximately 0 is provided by the sensor unit SU1. It indicates that the sensor unit SU2 has not received the predetermined signals I1 (N1, T1) transmitted wirelessly. The detectable intensity is the minimum reception intensity at which the sensor unit SU2 determines that the signal has been received. When the intensity received by the sensor unit SU2 of the predetermined signal I1 (N1, T1) is larger than the detectable intensity and smaller than the predetermined intensity, the intensity received by the sensor unit SU2 of the predetermined signal I1 (N1, T1). Indicates that is small.

FIG. 4 is a schematic diagram showing a mode in which the controller cannot receive the predetermined signal I1 in the high precision mode. The controller 20 can select and execute either the low consumption mode shown in FIG. 3 or the high precision mode shown in FIG.

At the second transmission time T2 (n-1), the sensor unit SU2 transmits a predetermined signal I2 (N2, T2, A12). Here, the predetermined signal I2 (N2, T2, A12) includes the information A12. The controller 20 receives a predetermined signal I2 (N2, T2, A12) from the sensor unit SU2, determines an abnormality (state) of the sensor unit SU1 based on the received predetermined signal I2 (N2, T2, A12), and determines. Notify (notify) the result to the center.

When the controller 20 receives the predetermined signal I2 (N2, T2, A12) from the sensor unit SU2, the controller 20 wirelessly transmits the reception confirmation signal AC2 (D2, T1r (n)). That is, the controller 20 instructs the sensor unit SU2 to receive the predetermined signal I1 (N1, T1) from the sensor unit SU1 on behalf of each time. The controller 20 calculates the time-dependent deviation amount Te1 based on the deviation between the clock count number C1 and the clock count number Cc. The controller 20 indicates a correction start time T1r (n) in which the sensor unit SU2 starts from the hibernation state corresponding to the first transmission time T1 (n). When the sensor unit SU2 receives the reception confirmation signal AC2 (D2, T1r (n)), it determines that the communication between itself and the controller 20 is normal, and shifts to the sleep state.

At the first transmission time T1 (n), the sensor unit SU1 transmits a predetermined signal I1 (N1, T1). When the controller 20 receives the predetermined signal I1 (N1, T1) from the sensor unit SU1, it determines that the communication between itself and the sensor unit SU1 is normal. Further, the sensor unit SU2 is in a hibernate state corresponding to the correction start time T1r (n) on condition that the substitute reception signal D2 included in the reception confirmation signal AC2 (D2, T1r (n)) is received from the controller 20. The sensor unit SU1 wirelessly transmits a predetermined signal I1 (N1, T1) at the first transmission time T1 (n). After that, the sensor units SU1 and SU2 repeat transmission of predetermined signals I1 (N1, T1) and I2 (N2, T2, A12). Further, the controller 20 calculates the time-dependent deviation amount Te1 based on the deviation between the clock count number C1 and the clock count number Cc.

Here, at the first transmission time T1 (n + k), the sensor unit SU1 transmits a predetermined signal I1 (N1, T1). It is assumed that the controller 20 cannot receive the predetermined signal I1 (N1, T1) transmitted by the sensor unit SU1. At this time, since the proxy reception signal D2 is included in the reception confirmation signal AC2 (D2, T1r (n + k)) received from the controller 20, the sensor unit SU2 is in a hibernate state corresponding to the correction start time T1r (n + k). The sensor unit SU1 wirelessly transmits a predetermined signal I1 (N1, T1) at the first transmission time T1 (n + k).

At the second transmission time T2 (n + k), the sensor unit SU2 transmits a predetermined signal I2 (N2, T2, A12). The controller 20 receives a predetermined signal I2 (N2, T2, A12) from the sensor unit SU2. When the controller 20 receives the predetermined signal I2 (N2, T2, A12) from the sensor unit SU2, the controller 20 includes information indicating the sensor unit SU1 that could not be confirmed to be transmitting the predetermined signal I1 (N1, T1). , Notify the center of the predetermined signal I2 (N2, T2, A12).

When the controller 20 receives the predetermined signal I2 (N2, T2, A12) from the sensor unit SU2, the controller 20 wirelessly transmits the reception confirmation signal AC2 (D2, T1r (n + k + 1)). That is, the controller 20 instructs the sensor unit SU2 to receive the predetermined signal I1 (N1, T1) from the sensor unit SU1 on behalf of each time. The controller 20 calculates the time-dependent deviation amount Te1 based on the deviation between the clock count number C1 and the clock count number Cc. The controller 20 indicates a correction start time T1r (n + k + 1) in which the sensor unit SU2 starts from the hibernation state corresponding to the first transmission time T1 (n + k + 1). When the sensor unit SU2 receives the reception confirmation signal AC2 (D2, T1r (n + k + 1)), it determines that the communication between itself and the controller 20 is normal, and shifts to the sleep state.

The present embodiment described in detail above has the following advantages.

-The plurality of sensor units include the sensor unit SU1 and the sensor unit SU2. The sensor unit SU1 is activated from the hibernation state corresponding to the first transmission time T1 (n), wirelessly transmits a predetermined signal I1 (N1, T1), and then shifts to the hibernation state. Therefore, it is possible to suppress the power consumption of the sensor unit SU1 when the predetermined signals I1 (N1, T1) are not transmitted wirelessly. As the sensor unit SU1, a sensor unit dedicated to transmission can be adopted. Here, the predetermined signal I1 (N1, T1) includes information (T1) regarding the first transmission timing T1 (n). Therefore, the sensor unit SU2 can grasp the first transmission timing T1 (n) based on the predetermined signals I1 (N1, T1).

The sensor unit SU2 is activated from the hibernation state corresponding to the first transmission time T1 (n), and after receiving the predetermined signals I1 (N1, T1) transmitted wirelessly by the sensor unit SU1, the sensor unit SU1 shifts to the hibernation state. That is, the sensor unit SU2 wirelessly transmits the predetermined signal I2 (N2, T2) at the transmission time when the sensor unit SU1 wirelessly transmits the predetermined signal I1 (N1, T1) when the predetermined condition is satisfied. It starts even if it is not the second transmission time T2 (n) to be transmitted, and after the sensor unit SU1 receives the predetermined signal I1 (N1, T1) transmitted wirelessly, it shifts to the hibernation state. Therefore, the sensor unit SU2 determines whether or not the predetermined signal I1 (N1, T1) is received from the sensor unit SU1, the strength of the received predetermined signal I1 (N1, T1), and the like, which the sensor unit SU1 wirelessly transmits. It is possible to acquire information regarding the state in which the signal I1 (N1, T1) is received by itself. Since the sensor unit SU2 shifts to the hibernation state after receiving the predetermined signal I1 (N1, T1) transmitted wirelessly by the sensor unit SU1, the power of the sensor unit SU2 when the predetermined signal I1 (N1, T1) is not received. Consumption can be suppressed.

The sensor unit SU2 transmits the predetermined signal I2 (N2, T2, A12) including the information A12 regarding the state in which the predetermined signal I1 (N1, T1) is received from the hibernation state corresponding to the second transmission time T2 (n). After activating and transmitting wirelessly, it goes into hibernation. The controller 20 receives the predetermined signals I1 (N1, T1) and the predetermined signals I2 (N2, T2) from the sensor units SU1 and SU2, and receives the predetermined signals I1 (N1, T1) and the predetermined signals I2 (N2, T2). The state of the sensor units SU1 and SU2 is determined based on the above, and the determination result is notified. For example, the controller 20 can determine that some abnormality has occurred when the predetermined signal I1 (N1, T1) is not received from the sensor unit SU1 at the first transmission time T1 (n).

The controller 20 wirelessly transmits the predetermined signal I1 (N1, T1) based on the predetermined signal I2 (N2, T2, A12) received from the sensor unit SU2, and then the sensor 20. The state of the unit SU1 can be determined and the determination result can be notified. For example, the predetermined signal I2 (N2, T2, A12) includes information A12 indicating whether or not the sensor unit SU2 has received the predetermined signal I1 (N1, T1) transmitted by the sensor unit SU1 wirelessly, and the controller 20 is the sensor. It is assumed that an abnormality has occurred in which the predetermined signal I1 (N1, T1) cannot be received from the unit SU1, and the sensor unit SU2 has received the predetermined signal I1 (N1, T1) transmitted wirelessly by the sensor unit SU1. In this case, it can be excluded from the cause of abnormality that the sensor unit SU1 does not transmit the predetermined signal I1 (N1, T1) wirelessly. Therefore, the administrator of the wireless monitoring system 10 can easily identify the cause of the abnormality before going to the site where the sensor unit SU1 is installed.

-The sensor units SU1 and SU2 set the first transmission time T1 (n) and the second transmission time T2 (n) based on the pseudo-random numbers. Therefore, the first transmission timing T1 (n) and the second transmission timing T2 (n) can be changed each time, and the predetermined signals I1 (N1, T1) and the predetermined signals I2 (N2, T2) of the sensor units SU1 and SU2 can be changed. ) Is the transmission time of the predetermined signal I1 (N1, T1) or the predetermined signal I2 (N2, T2) of the sensor unit other than itself (first transmission time T1 (n) or second transmission time T2 (n)). ) Can be suppressed from overlapping.

The information regarding the first transmission time T1 (n) and the second transmission time T2 (n) is random number identification information T1 and T2 that can specify the generated pseudo-random number. Therefore, the sensor unit SU2 can grasp the first transmission time T1 (n) based on the random number identification information T1 included in the predetermined signals I1 (N1, T1). Therefore, even if the first transmission time T1 (n) is changed each time based on the pseudo-random number, the sensor unit SU2 can specify the first transmission time T1 (n), and the first transmission time T1 (n) can be specified. It can be started from hibernation corresponding to.

The controller 20 specifies the first transmission time T1 (n) based on the random number identification information T1, and receives confirmation signal AC2 (correction start time T1r (n)) including the specified first transmission time T1 (n). D2, T1r (n)) is transmitted wirelessly, and the sensor unit SU2 receives the reception confirmation signal AC2 (D2, T1r (n)) from the controller 20. According to such a configuration, the controller 20 specifies the first transmission timing T1 (n) based on the random number identification information T1 and transmits the reception confirmation signal AC2 (D2, T1r (n)), and the sensor unit SU2 is the controller 20. By receiving the reception confirmation signal AC2 (D2, T1r (n)) from, the first transmission timing T1 (n) can be grasped.

The controller 20 receives the predetermined signal I1 (N1, T1) on condition that the predetermined signal I1 (N1, T1) is not received at the time when the predetermined signal I1 (N1, T1) should be received from the sensor unit SU1. The proxy reception signal D2 (reception confirmation signal AC2 (D2, T1r (n)) instructing reception by proxy is transmitted. Therefore, the controller 20 receives the predetermined signal I1 (N1, T1) from the sensor unit SU1. If the predetermined signal I1 (N1, T1) is not received at the scheduled time, the controller 20 can instruct the proxy reception signal D2 to receive the predetermined signal I1 (N1, T1) on behalf of the controller 20. When the predetermined signal I1 (N1, T1) is received at the time when the predetermined signal I1 (N1, T1) should be received from the sensor unit SU1, the proxy reception signal D2 is not transmitted wirelessly.

When the sensor unit SU2 receives the proxy reception signal D2 from the controller 20, the sensor unit SU2 is activated from the hibernation state corresponding to the first transmission timing T1 (n), and the sensor unit SU1 wirelessly transmits a predetermined signal I1 (N1). , T1) is received. On the other hand, when the sensor unit SU2 does not receive the proxy reception signal D2 from the controller 20, the sensor unit SU2 is activated from the hibernation state corresponding to the first transmission time T1 (n), and the sensor unit SU1 wirelessly transmits the predetermined value. Do not receive the signal I1 (N1, T1). Therefore, when the controller 20 receives the predetermined signal I1 (N1, T1) at the time when the predetermined signal I1 (N1, T1) should be received from the sensor unit SU1, that is, when the sensor unit SU1 is presumed to be normal. It is possible to prevent the sensor unit SU2 corresponding to the first transmission time T1 (n) from starting from the hibernation state, and it is possible to suppress the power consumption of the sensor unit SU2.

-In the high-precision mode, the sensor unit SU2 is activated from the hibernation state each time corresponding to the first transmission time T1 (n), and receives the predetermined signal I1 (N1, T1) transmitted wirelessly by the sensor unit SU1. Therefore, the sensor unit SU2 acquires the information A12 regarding the state in which the sensor unit SU1 has received the predetermined signals I1 (N1, T1) wirelessly transmitted each time corresponding to the first transmission time T1 (n). be able to. Then, in the controller 20, based on the predetermined signal I2 (N2, T2, A12) received from the sensor unit SU2, the sensor unit SU1 corresponds to the first transmission time T1 (n) and the sensor unit SU1 receives the predetermined signal I1 (N1, T1). It is possible to grasp the state of wireless transmission every time. Therefore, even if the predetermined signal I1 (N1, T1) does not reach the controller 20 from the sensor unit SU1, the controller 20 quickly grasps the state in which the sensor unit SU1 wirelessly transmits the predetermined signal I1 (N1, T1). be able to.

The controller 20 calculates a time-dependent deviation amount Te1 which is an amount at which the time when the sensor unit SU1 transmits the predetermined signal I1 (N1, T1) shifts with the passage of time, and the sensor unit SU2 calculates the first transmission time T1 (n). ), The reception confirmation signal AC2 (D2, T1r (n)) including the correction start time T1r (n) corrected based on the time lag amount Te1 for the time to start from the hibernation state is transmitted wirelessly. The sensor unit SU2 receives the reception confirmation signal AC2 (D2, T1r (n)) from the controller 20 and starts from the hibernation state corresponding to the correction start time T1r (n) instead of the first transmission time T1 (n). Then, after the sensor unit SU1 receives the predetermined signals I1 (N1, T1) transmitted wirelessly, it shifts to the hibernation state. According to such a configuration, it is not necessary to set a long time for the sensor unit SU2 to start from the hibernation state and receive the predetermined signal I1 (N1, T1) corresponding to the first transmission time T1 (n). It is possible to suppress an increase in the power consumption of the unit SU2.

The determination result includes a predetermined signal I2 (N2, T2, A12) received by the controller 20 from the sensor unit SU2. The predetermined signal I2 (N2, T2, A12) includes information A12 regarding a state in which the sensor unit SU2 receives the predetermined signal I1 (N1, T1) wirelessly transmitted by the sensor unit SU1. Therefore, the administrator of the wireless monitoring system 10 can easily identify the cause of the abnormality based on the notified determination result, and can easily identify the cause of the abnormality before going to the site where the sensor unit SU1 is installed.

It should be noted that the above embodiment can be modified and implemented as follows. The same parts as those in the above embodiment are designated by the same reference numerals, and the description thereof will be omitted.

-In the high-precision mode, the sensor unit SU2 is activated from the hibernation state each time corresponding to the first transmission time T1 (n), and receives the predetermined signal I1 (N1, T1) transmitted wirelessly by the sensor unit SU1. In this case, the proxy reception signal D2 included in the reception confirmation signal AC2 (D2, T1r (n)) can be omitted, that is, the process of transmitting the proxy reception signal D2 by the controller 20 can be omitted. For example, the sensor unit SU2 is set in advance so as to be activated from the hibernation state each time corresponding to the first transmission time T1 (n) and to receive the predetermined signal I1 (N1, T1) transmitted wirelessly by the sensor unit SU1. You can also keep it.

As shown in FIG. 5, the controller 20 specifies the first transmission time T1 (n) based on the random number identification information T1, and specifies the second transmission time T2 (n) based on the random number identification information T2. For example, when the specified first transmission time T1 (n + k + 1) and the second transmission time T2 (n + k + 1) overlap, the reception confirmation signal AC2 (R1) including the first change signal R1 for changing the second transmission time T2 (n + k + 1). ) Is transmitted wirelessly, the sensor unit SU2 receives the reception confirmation signal AC2 (R1) from the controller 20, and the second transmission timing T2 (n + k + 1) can be changed based on the first change signal R1. The first change signal R1 includes information (identification number and the like) for identifying the sensor unit SU2 and a second transmission time T2r (n + k + 1) after the change. According to such a configuration, the second transmission timing T2 (n) of the sensor unit SU2 capable of receiving the reception confirmation signal AC2 (R1) when the first transmission timing T1 (n) and the second transmission timing T2 (n) overlap. ) Can be changed to shift the first transmission time T1 (n) and the second transmission time T2 (n).

-In the above embodiment, when the controller 20 receives the predetermined signal I2 (N2, T2, A12) from the sensor unit SU2, it cannot confirm that the predetermined signal I1 (N1, T1) is transmitted. The information indicating the unit SU1 and the predetermined signal I2 (N2, T2, A12) were notified to the center. Instead of this, when the controller 20 receives the predetermined signal I2 (N2, T2, A12) from the sensor unit SU2, the controller 20 cannot confirm that the predetermined signal I1 (N1, T1) is transmitted. The information indicating SU1 and the estimation result of estimating the cause of abnormality of the sensor unit SU1 may be notified to the center.

That is, the determination result by the controller 20 is that the information indicating the sensor unit SU1 that could not be confirmed that the predetermined signal I1 (N1, T1) is transmitted and the predetermined signal I1 (N1, T1) are transmitted. It may include the estimation result of estimating the cause of the abnormality of the sensor unit SU1 that could not be confirmed. According to such a configuration, the administrator of the wireless monitoring system 10 can know the estimation result of the cause of the abnormality from the notified determination result, and can easily identify the cause of the abnormality before going to the site where the sensor unit SU1 is installed. Become.

For example, the controller 20 estimates that the reception sensitivity of the controller 20 is lowered when the strengths of the predetermined signals I1 and I2 received by the controller 20 from the sensor units SU1 and SU2 are all smaller than the predetermined strengths. be able to. Further, the wireless monitoring system 10 includes the sensor unit SU3 in addition to the sensor units SU1 and SU2, and the controller 20 cannot receive the predetermined signal I1 from the sensor unit SU1 and the controller 20 is the sensor unit SU2. , If the predetermined signals I2 and I3 can be received from SU3 and the sensor units SU2 and SU3 can receive the predetermined signal I1 from the sensor unit SU1, there is a failure between the controller 20 and the sensor unit SU1. It can be estimated that there is an object.

As shown in FIG. 6, the controller 20 could not execute the process of receiving the predetermined signal I2 (N2, T2) from the predetermined sensor unit SU2 at the second transmission timing T2 (n) of the predetermined sensor unit SU2. When this occurs a plurality of times, the second change signal R2 for changing the second transmission timing T2 (n) of the predetermined sensor unit SU2 is wirelessly transmitted to the predetermined sensor unit SU2, and the predetermined sensor unit SU2 , The second change signal R2 may be received from the controller 20, and the second transmission timing T2 (n) of the predetermined sensor unit SU2 may be changed based on the received second change signal R2. The sensor unit SU2 receives the second change signal R2 from the controller 20, and changes the second transmission time T2 (n) (starting time) of the sensor unit SU2 based on the received second change signal R2. According to such a configuration, by changing the second transmission timing T2 (n) of the predetermined sensor unit SU2, the controller 20 can determine the abnormality of the predetermined sensor unit SU2.

The controller 20 omits the process of calculating the correction start time T1r (n) in which the first transmission time T1 (n) is corrected based on the time lag amount Te1, and the reception confirmation including the first transmission time T1 (n). The signal AC2 (D2, T1 (n)) can also be transmitted wirelessly during the period when the sensor unit SU2 is in a transmit / receive state.

-The sensor unit SU2 can also directly receive the predetermined signal I1 (N1, T1) and grasp the first transmission time T1 (n) based on the random number identification information T1.

The sensor units SU1 and SU2 are not limited to the configuration in which the first transmission timing T1 (n) and the second transmission timing T2 (n) are set based on pseudo-random numbers, but the first transmission timing T1 (n) and the second transmission are not limited to the configuration. The time T2 (n) may be set periodically (regularly).

-There are a plurality of sensor units SU1n corresponding to the sensor unit SU1, there are the same number (plural) of sensor units SU2n corresponding to the sensor unit SU2 as there are sensor units SU1n, and each sensor unit SU2n can be in charge of each sensor unit SU1n. Further, there may be a plurality of sensor units SU1n corresponding to the sensor unit SU1, a single sensor unit SU2n corresponding to the sensor unit SU2, and the sensor unit SU2n may be in charge of the plurality of sensor units SU1n. Further, there is a single sensor unit SU1n corresponding to the sensor unit SU1, a plurality of sensor units SU2n corresponding to the sensor unit SU2, and a plurality of sensor units SU2n duplicate predetermined signals I1 (N1, T1) transmitted by the sensor unit SU1n. It can also be received (redundant reception). Further, the number of sensor units SU1n and SU2n can be increased to several tens or hundreds.

-The sensor units SU1 and SU1n may be sensor units capable of transmitting and receiving.

-The sensor units SU1, SU1n, SU2, and SU2n are not limited to those operated by the electric power supplied from the battery, and may be operated by, for example, the electric power supplied from the commercial power source. Even in that case, the power consumption of the sensor units SU1, SU1n, SU2, and SU2n can be suppressed by shifting the sensor units SU1, SU1n, SU2, and SU2n to the sleep state.

-The sensor units SU1, SU1n, SU2, and SU2n are not limited to the magnet sensors 34 and 44 that detect that a window or door has been opened, but also a sensor that detects temperature, a sensor that detects pressure, and predetermined values in factories and the like. It may be provided with a camera (sensor) for photographing an area, a card reader (sensor) for reading an ID card (entry permission card) when a worker enters the room, and the like. Then, the sensor units SU1, SU1n, SU2, SU2n wirelessly transmit the detection results by these sensors and can shift to the hibernation state, and the controller 20 receives the detections received from the sensor units SU1, SU1n, SU2, SU2n. Anything that executes a predetermined process based on the result may be used.

10 ... wireless monitoring system, 20 ... controller (control unit), 34 ... magnet sensor (sensor), 44 ... magnet sensor (sensor), SU1 ... sensor unit (first sensor unit), SU2 ... sensor unit (second sensor unit) ), SU1n ... Sensor unit (first sensor unit), SU2n ... Sensor unit (second sensor unit).

Claims (10)

A plurality of sensor units equipped with a sensor for performing a predetermined detection, which can wirelessly transmit the detection result of the sensor and shift to a hibernation state, and a plurality of sensor units.
A control unit that executes a predetermined process based on the detection results received from the plurality of sensor units, and a control unit.
It is a wireless monitoring system equipped with
The plurality of sensor units are activated from the hibernation state corresponding to the first transmission time, and after wirelessly transmitting a first predetermined signal including information on the first transmission time, the first sensor shifts to the hibernation state. After receiving the unit and the first predetermined signal transmitted by the first sensor unit wirelessly from the hibernation state corresponding to the first transmission timing, the unit and the first predetermined signal are transferred to the hibernation state, and the first predetermined signal is transmitted. The second predetermined signal including the information regarding the received state is included with the second sensor unit which starts from the hibernation state and wirelessly transmits the second predetermined signal corresponding to the second transmission time and then shifts to the hibernation state.
The control unit receives the first predetermined signal and the second predetermined signal from the plurality of sensor units, and determines the state of the plurality of sensor units based on the received first predetermined signal and the second predetermined signal. A wireless monitoring system that makes judgments and notifies the judgment results. The first sensor unit sets the first transmission time based on a pseudo-random number, and sets the first transmission time.
The wireless monitoring system according to claim 1, wherein the information regarding the first transmission timing is random number identification information that makes it possible to specify the generated pseudo-random number. The control unit specifies the first transmission time based on the random number identification information, and wirelessly transmits the transmission time information including the specified first transmission time.
The wireless monitoring system according to claim 2, wherein the second sensor unit receives the transmission timing information from the control unit. The second predetermined signal includes information regarding the second transmission timing.
The control unit specifies the first transmission time based on the random number identification information, and specifies and specifies the second transmission time based on the second predetermined signal received from the second sensor unit. When the 1st transmission time and the 2nd transmission time overlap, the 1st change signal for changing the 2nd transmission time is transmitted wirelessly.
The wireless monitoring system according to claim 3, wherein the second sensor unit receives the first change signal from the control unit and changes the second transmission timing based on the received first change signal. The control unit instructs to receive the first predetermined signal on behalf of the first sensor unit on condition that the first predetermined signal is not received at the time when the first predetermined signal should be received. Send the proxy reception signal wirelessly,
The second sensor unit is activated from the hibernation state in accordance with the first transmission timing on condition that the proxy reception signal is received from the control unit, and the first sensor unit wirelessly transmits the second sensor unit. 1. The wireless monitoring system according to any one of claims 1 to 4, which receives a predetermined signal. Any of claims 1 to 4, wherein the second sensor unit is activated from the hibernation state each time corresponding to the first transmission time and receives the first predetermined signal transmitted wirelessly by the first sensor unit. The wireless monitoring system according to item 1. The control unit calculates the amount of time lag, which is the amount at which the time when the first sensor unit transmits the first predetermined signal shifts with the passage of time, and the second sensor unit corresponds to the first transmission time. Then, the correction information including the correction start time obtained by correcting the start time from the hibernation state based on the time lag amount is transmitted wirelessly.
The second sensor unit receives the correction information from the control unit, activates from the hibernation state corresponding to the correction activation timing instead of the first transmission timing, and the first sensor unit wirelessly operates. The wireless monitoring system according to any one of claims 1 to 6, wherein the wireless monitoring system shifts to the hibernation state after receiving the transmitted first predetermined signal. The determination result includes information indicating a first sensor unit that could not be confirmed to be transmitting the first predetermined signal, and the second predetermined signal received by the control unit from the second sensor unit. , The wireless monitoring system according to any one of claims 1 to 7. The determination result includes information indicating the first sensor unit that could not be confirmed to be transmitting the first predetermined signal, and the first sensor unit that could not be confirmed to be transmitting the first predetermined signal. The wireless monitoring system according to any one of claims 1 to 7, which includes an estimation result for estimating the cause of the abnormality. When the control unit cannot execute the process of receiving the second predetermined signal from the predetermined second sensor unit a plurality of times during the second transmission time of the predetermined second sensor unit, the control unit said. The second change signal for changing the second transmission timing of the predetermined second sensor unit is wirelessly transmitted to the predetermined second sensor unit.
The predetermined second sensor unit receives the second change signal from the control unit, and changes the second transmission timing of the predetermined second sensor unit based on the received second change signal. Item 5. The wireless monitoring system according to any one of Items 1 to 9.

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