JP6977237B2 - Anomaly detection system, anomaly detection method and program - Google Patents

Description

The present invention relates to an abnormality detection system, an abnormality detection method and a program for detecting an abnormality generated in a beacon terminal for estimating the position of a mobile terminal carried by a security guard during security work.

Conventionally, there is a technique for estimating the position of a person using a beacon. In this technique, if any abnormality occurs in the beacon terminal (signal transmitter), the position estimation cannot be executed correctly, so it is necessary to detect the abnormality.

For example, Patent Document 1 below describes that a mesh network is formed between beacon terminals and anomalies generated in the beacon terminals are detected by communicating abnormality information. In the technique described in Patent Document 1, by setting the retention period in which the beacon terminal retains the abnormality information and the number of times the abnormality information is transferred between the beacon terminals, the abnormality information is retained for a longer period than necessary or in a wide range. It is prevented from being done.

Japanese Unexamined Patent Publication No. 2017-73614

However, in the technique described in Patent Document 1, the holding period elapses before the signal from the beacon terminal holding the abnormality information is read by the mobile terminal, and the abnormality information is deleted without being notified to the mobile terminal. There is a possibility that it will end up.

Here, if the retention period of the abnormality information is set to be long, it is possible to prevent the retention period from ending before the abnormality information is read by the mobile terminal. However, in this case, since it takes a long time for the abnormality information to be deleted, it becomes easy for the same abnormality information to be repeatedly notified to the mobile terminal and the center (management device), and the processing at the center is increased or unnecessary. It becomes a factor that leads to various measures.

In view of the above circumstances, an object of the present invention is to reliably notify the mobile terminal of the abnormality information transmitted from the signal transmitter, and to prevent the same abnormality information from being repeatedly notified to the mobile terminal as much as possible. It is an object of the present invention to provide an abnormality detection system, an abnormality detection method and a program capable of the above.

In order to achieve the above object, the abnormality detection system according to one embodiment of the present invention is a worker who works at the above facility for an abnormality generated in any of a plurality of signal transmitters installed in the space of the facility to be managed. It is an abnormality detection system that notifies the mobile terminal carried by. The signal transmitter has a communication unit, an abnormality determination unit, and a storage unit. The communication unit can communicate with other signal transmitters and the mobile terminal within a predetermined distance range, and transmits a signal including its own identification information. The abnormality determination unit determines the presence or absence of an abnormality in the signal transmitter. The storage unit stores history information including the time when the signal is notified to the mobile terminal, and the abnormality indicating the abnormality during a predetermined holding period after the abnormality determination unit determines the abnormality. Memorize information. The abnormality determination unit sets the retention period for each time zone according to the history information, and the communication unit transmits a signal including the abnormality information during the retention period. The mobile terminal has a short-range communication unit that receives the signal from the signal transmitter existing within a predetermined distance range.

With this configuration, it is possible to reliably notify the mobile terminal of the abnormality information transmitted from the signal transmitter, and prevent the same abnormality information from being repeatedly notified to the mobile terminal as much as possible.

The abnormality determination unit may set the retention period longer as the number of times notified per predetermined unit time is smaller.

As a result, the retention period can be dynamically changed according to the passage frequency of the guards arranged in the space, and the retention time can be set according to the expected transmission time of abnormal information.

The communication unit may acquire information on the number of signal transmitters that have notified the mobile terminal of the signal per predetermined unit time. In this case, the abnormality determination unit may set the holding period longer as the number of machines is smaller.

As a result, the retention period is dynamically changed according to the range in which the guards placed in the space move (cover) in the space, and the retention time is set according to the expected transmission time of abnormal information. be able to.

Even before the retention period has elapsed, the storage unit may delete the abnormal information when the mobile terminal is notified of the abnormal information.

As a result, once the abnormal information is notified to the mobile terminal, the abnormal information is immediately deleted, so that the same abnormal information can be prevented from being repeatedly notified.

When the communication unit notifies the mobile terminal of the abnormality information, the communication unit may transmit the notified information of the abnormality information. In this case, another signal transmitter that has received the notified information may delete the corresponding abnormality information.

As a result, when the signal transmitter itself transmits the abnormality information to the mobile terminal, the other signal transmitters can also delete the abnormality information, further preventing the same abnormality information from being repeatedly notified. can do.

In the abnormality detection method according to another aspect of the present invention, an abnormality generated in any of a plurality of signal transmitters installed in the space of the facility to be managed is transmitted to a mobile terminal carried by a worker working in the facility. It ’s a way to notify
A signal including the identification information of each signal transmitter is transmitted from each of the above signal transmitters.
Each of the above signal transmitters determines the presence or absence of an abnormality in the above signal transmitter, and determines whether or not there is an abnormality.
During the predetermined retention period after the determination of the above abnormality, the abnormality information indicating the above abnormality is stored, and the abnormality information indicating the above abnormality is stored.
The retention period is set for each time zone according to the history information including the time when the signal is notified to the mobile terminal.
During the above retention period, a signal containing the above abnormality information is transmitted,
The mobile terminal includes receiving the signal from the signal transmitter existing in a predetermined distance range.

The program according to another embodiment of the present invention applies to a signal transmitter installed in a space for a worker carrying a mobile terminal to perform work.
A step of transmitting a signal including identification information of each signal transmitter from each of the above signal transmitters, and
The step in which each of the above signal transmitters determines the presence or absence of an abnormality in the above signal transmitter,
A step of storing abnormality information indicating the abnormality for a predetermined retention period after the determination of the abnormality, and a step of storing the abnormality information indicating the abnormality.
A step of setting the retention period for each time zone according to history information including the time when the signal is notified to the mobile terminal, and
During the retention period, the step of transmitting a signal including the abnormality information is executed.

As described above, according to the present invention, it is possible to reliably notify the mobile terminal of the abnormality information transmitted from the signal transmitter, and prevent the same abnormality information from being repeatedly notified to the mobile terminal as much as possible. .. However, the effect does not limit the present invention.

It is a figure which showed the structure of the position estimation system which concerns on one Embodiment of this invention. It is a figure which showed the hardware configuration of the center server which concerns on one Embodiment of this invention. It is a figure which showed the structure of the functional block of the center server, the mobile terminal, and the beacon terminal which concerns on one Embodiment of this invention. It is a figure explaining the threshold value set by the center server which concerns on one Embodiment of this invention. It is a figure which showed the example of the database of the identification information and the position information of the beacon terminal stored in the center server which concerns on one Embodiment of this invention. It is a figure which showed the example of the detection data (time-series data of the signal strength for each beacon terminal received by the mobile terminal of a security guard) stored in the center server which concerns on one Embodiment of this invention. It is a figure which showed the table of the movable route condition of the guard between the beacon terminals stored in the center server which concerns on one Embodiment of this invention. It is a figure for demonstrating the processing of the system at the time of the abnormality occurrence of the beacon terminal in one Embodiment of this invention. It is a figure for demonstrating the flow of the notification processing of a mobile terminal at the time of the occurrence of abnormality of the beacon terminal in one Embodiment of this invention. It is a figure for demonstrating the flow of the abnormality determination processing of the center server at the time of the abnormality recovery of the beacon terminal in one Embodiment of this invention. It is a figure for demonstrating the processing of the system concerning the deletion of the abnormality information of a beacon terminal in one Embodiment of this invention. It is a flowchart which showed the flow of the abnormality information deletion processing by the beacon terminal which concerns on one Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[System configuration]
FIG. 1 is a diagram showing a configuration of a position estimation system according to the present embodiment.

As shown in the figure, this system includes a center server 100, a mobile terminal 200, and a plurality of beacon terminals 300.

The center server 100 is a server installed in a security center operated by a security company, and manages the status of the security guard G and the beacon terminal 300. The center server 100 can communicate with the mobile terminal 200 via the mobile network and the Internet. A security guard is stationed at the security center to monitor the position of the security guard G in the security target facility B, and when an abnormality report is received from the security guard G, the security guard is dispatched to the security target facility B. Necessary measures will be taken.

The security target facility B is, for example, an airport, a station, a commercial facility (department store, supermarket, etc.), an entertainment place, an office of a company, a private residence, or the like.

The mobile terminal 200 is, for example, a smartphone or a security-only terminal, and is carried by a security guard G who guards the security target facility B. In the figure, one guard G and one mobile terminal 200 are shown, but a plurality of guards G and the mobile terminal 200 may exist in the guarded facility B.

A plurality of beacon terminals 300 (A to T) are installed in various places (walls, ceilings, fixtures, etc.) of the security target facility B, and Bluetooth (registered trademark) signals such as BLE (Bluetooth (registered trademark) Low Energy) (registered trademark) ( It is a signal transmitter that transmits information such as beacon terminal identification information and abnormality information by means of a beacon signal), and a device that has received the beacon signal (such as a mobile terminal 200) can know information such as abnormality information. Further, the beacon terminal 300 can communicate with each other and transmit abnormality information of the beacon terminal 300 or the like to another beacon terminal 300. The abnormality of the beacon terminal 300 means a state in which it becomes impossible to transmit a signal from the original installation position such as theft of the beacon terminal 300, a dead battery, or other failure. Further, the abnormality information includes the identification information of the beacon terminal 300 so that it is possible to identify which beacon the abnormality has occurred. The signal transmitter may be an ultrasonic transmitter that emits an ultrasonic signal. In this case, the mobile terminal 200 can know information such as abnormality information by receiving the ultrasonic signal emitted from the ultrasonic transmitter.

The mobile terminal 200 receives a beacon signal from each of the beacon terminals 300 and transmits information on the signal strength to the center server 100 via the mobile network and the Internet. The center server 100 estimates which beacon terminal 300 the guard G is in the vicinity of, based on the signal strength. Further, the mobile terminal 200 transmits data or the like acquired by the security guard G during the security work to the center server 100.

[Center server hardware configuration]
FIG. 2 is a diagram showing the hardware configuration of the center server 100. As shown in the figure, the center server 100 includes a CPU (Central Processing Unit) 11, a ROM (Read Only Memory) 12, a RAM (Random Access Memory) 13, an input / output interface 15, and a bus 14 connecting these to each other. To prepare for.

The CPU 11 appropriately accesses the RAM 13 and the like as necessary, and controls the entire block of the center server 100 in an integrated manner while performing various arithmetic processes. The ROM 12 is a non-volatile memory in which firmware such as an OS, a program, and various parameters to be executed by the CPU 11 is fixedly stored. The RAM 13 is used as a work area of the CPU 11, and temporarily holds an OS, various applications being executed, and various data being processed.

A display unit 16, an operation reception unit 17, a storage unit 18, a communication unit 19, and the like are connected to the input / output interface 15.

The display unit 16 is a display device using, for example, an LCD (Liquid Crystal Display), an OLELD (Organic ElectroLuminescence Display), a CRT (Cathode Ray Tube), or the like.

The operation reception unit 17 is, for example, a pointing device such as a mouse, a keyboard, a touch panel, or other input device.

The storage unit 18 is a non-volatile memory such as an HDD (Hard Disk Drive), a flash memory (SSD; Solid State Drive), or another solid-state memory. The OS, various applications, and various data are stored in the storage unit 18.

In particular, in the present embodiment, the storage unit 18 stores an application and other programs and a database for the center server 100 to execute the position estimation process of the guard and the threshold value setting process of the signal strength which is a premise thereof.

The communication unit 19 is a module for wireless communication such as a NIC (Network Interface Card) for Ethernet and a wireless LAN, and is responsible for communication processing with the mobile terminal 200.

The basic hardware configuration of the mobile terminal 200 and the beacon terminal 300 is substantially the same as the hardware configuration of the center server 100. The reference numerals indicating the corresponding hardware configurations are shown in parentheses of each reference numeral in FIG.

[Functions and database of each device in the system]
FIG. 3 is a diagram showing the configuration of functional blocks of the center server 100, the mobile terminal 200, and the beacon terminal 300.

(Functional block of center server)
As shown in the figure, the center server 100 has a communication unit 110, a storage unit 120, a threshold value setting unit 130, a position estimation unit 140, a state management unit 150, a display output unit 160, a timekeeping unit 170, and an abnormality recovery as functional blocks. It has a determination unit 180.

Here, in relation to the threshold value setting unit 130, the threshold value set by the center server 100 with respect to the signal strength of the beacon signal received by the mobile terminal 200 in the present embodiment will be described with reference to FIG.

As shown in FIG. 4, the threshold value regarding the signal strength of the beacon signal received from the beacon terminal 300 by the mobile terminal 200 is set in the facility by the guard G or the staff of the security target facility B carrying the reference mobile terminal. It can be set based on the signal strength measured when moving for a certain period of time.

The threshold depends on how the security center manager wants to know the position of the guards. For example, when the administrator wants to confirm whether or not the guard G exists within 5 m from the beacon terminal 300, as shown in the figure, the threshold value B is set from the average value of the signal strength at a point 5 m away. Just set it. When a single model is used as the mobile terminal 200, the threshold value set in the reference terminal can be similarly applied to the other mobile terminal 200. In the position estimation process by the center server 100, when the signal strength equal to or higher than the threshold value B is measured from the beacon 1, it is estimated that the guard G is present in the vicinity of the beacon 1 (within approximately 5 m).

On the other hand, when the administrator wants to confirm whether or not the guard is present at a position closer to the beacon 1 (within 1 m from the beacon terminal 300), the guard G is at a point 1 m away as shown in the figure. The threshold value A is set from the average value of the signal strength in. The threshold setting method is not limited to this. For example, the signal strength measured when the staff of the security target facility B carries the reference mobile terminal and moves in the facility by a predetermined route, and the security guard G actually moves the security target facility B through the predetermined route. A threshold value of the signal strength for position estimation may be set (initial setting or update) based on the difference from the signal strength measured at the time of movement. According to this, even when a plurality of models of mobile terminals are used, it is possible to set a threshold value in consideration of the reception sensitivity between the models.

Returning to FIG. 3, the communication unit 110 is a communication interface having a function of communicating with the mobile terminal 200, and receives detection data and the like via a mobile network, the Internet, and the like.

The storage unit 120 stores information on the installation position of each beacon terminal 300. FIG. 5 is a diagram showing an example of the installation position information.

As shown in the figure, the installation position information is a database in which the installation position of each beacon terminal 300 in the space of the security target facility B is registered in association with the identification information (beacon ID) of each beacon terminal 300. ..

In the example of the figure, the position (latitude and longitude) in the plane is registered for each beacon terminal 300, but three-dimensional position information may be registered by further adding information such as altitude. Further, not limited to latitude, longitude, and altitude, position information consisting of coordinate values (x, y, z) based on a certain position in a three-dimensional space may be registered.

Further, the storage unit 120 sequentially receives and stores the detection data received by the mobile terminal 200 when the guard G actually moves to the security target facility B from the mobile terminal 200. In the detection data, the identification information of the beacon terminal 300 and the signal strength are stored in association with each other. Further, as the data indicating the time series, data indicating the reception order of each beacon signal may be stored, or data indicating the reception time of each beacon signal may be stored. FIG. 6 is a diagram showing an example of the detection data.

In FIG. 1, the guard G possessing the mobile terminal 200 opens the door from the passage on the left side of the facility and enters the room in front of the facility, and the beacon terminal A → B → C → I → H → A → B → C. This is the detection data obtained when moving in the order of → D → O → E → F → G → D → C → B → A. The data such as "RA" and "RB" indicate the signal strength (R) from each beacon terminal 300 identified by the alphabet, and they are stored as time-series data over time t1 to t17. As the signal strength, the maximum signal strength (peak value) of the signal strength received from each beacon terminal 300 is adopted, and is stored as numerical data such as dBm (decibel meter).

When the signal strength of the beacon signal received from the beacon terminal 300 is equal to or higher than the threshold value set by the position estimation unit 140, the security guard G possessing the mobile terminal 200 is in the vicinity of the beacon terminal 300 of the receiving source (for example, 5 m). It is determined that it exists within).

The position estimation unit 140 may further add to the condition of position estimation that the route determination unit 150, which will be described later, determines that the route condition is satisfied.

The state management unit 150 manages the position information of the guard G and the abnormality information of the beacon terminal 300 from the detection data received from the mobile terminal 200.

The display output unit 160 outputs the detection data received from the mobile terminal 200 to a display means such as a monitor. As a result, the administrator can grasp the position information of the guard G and the abnormality information of the beacon terminal 300.

The timekeeping unit 170 measures the elapsed time from the time when the abnormality generated in the beacon terminal 300 is restored. Here, the timekeeping unit 170 shall use the time when the security guard G reports the completion of restoration of the beacon terminal 300 (and the time when the restoration completion information is input to the center server 200) as the restoration timing. Can be done.

The abnormality recovery determination unit 180 determines that the abnormality has been dealt with even if the abnormality information of the beacon terminal 300 is received until the elapsed time from the restoration of the beacon terminal 300 reaches a predetermined time, and a new occurrence occurs. It is not judged to be abnormal. For convenience, the predetermined time is also referred to as an "abnormality ignoring period".

The abnormality recovery determination unit 180 is the number of beacon terminals 300 that pass through the abnormality ignoring period from the beacon terminal 300 in which the abnormality has occurred according to the route condition to the beacon terminal 300 that has transmitted the abnormality information to the mobile terminal 200. Set according to the number of routes. Specifically, the larger the number of routes, the longer the abnormality ignoring period is set. This is because the larger the number of routes, the longer it takes for the recovered beacon terminal 300 to transmit the abnormal recovery information to the mobile terminal 200 and the center server 100. When the signal reception interval in the beacon terminal 300 is set every hour as described later, it takes up to 3 hours for the abnormality information to be transmitted from the beacon 1 to the beacon 4, for example. Therefore, regarding the abnormality generated in the beacon 1, the abnormality ignoring period of the abnormality information received from the beacon 4 can be set to 3 hours. Since it does not always take 3 hours for the abnormality information to be transmitted from Beacon 1 to Beacon 4, a time shorter than 3 hours may be set as the abnormality ignoring period. The details of this abnormality recovery determination process will be described later.

(Functional block of mobile terminal)
As shown in FIG. 3, the mobile terminal 200 has a short-range communication unit 210, a communication unit 220, a signal strength measurement unit 230, a storage unit 240, a route determination unit 250, and an abnormality determination unit 260 as functional blocks.

The short-range communication unit 210 is a communication interface having a function of performing short-range communication with the beacon terminal 300 within a predetermined distance range (for example, several tens of meters) in the space of the security target facility B, and is a beacon terminal in the space. Receives the beacon signal transmitted from 300. For short-range communication, for example, Bluetooth (registered trademark) such as BLE (Bluetooth (registered trademark) Low Energy), sound waves, and the like are used.

The communication unit 220 is a communication interface having a function of communicating with the center server 100. The communication unit 220 transmits detection data and the like to the center server 100 via, for example, a mobile phone network, an Internet network, a wireless LAN such as Wi-Fi, and the like.

The signal strength measuring unit 230 is a means for measuring the signal strength of the beacon signal received from the beacon terminal 300. When the beacon signal from the beacon terminal 300 is a radio wave, the signal strength measuring unit 230 detects the amplitude of the received radio wave as the signal strength.

The storage unit 240 stores the route condition indicating the route that the guard G can move in the security target facility B. FIG. 7 is a diagram showing an example of the route condition table.

In FIG. 1, the solid line connecting the adjacent beacon terminals 300 indicates a route on which the guard G can move, and as shown in FIG. 7, the route condition is registered for each beacon terminal 300 (identification information). ..

In the registration of the route condition, another beacon terminal 300 located within a predetermined distance from a certain beacon terminal 300 may be automatically connected, or the administrator may manually register the beacon terminal 300.

Referring to FIG. 1, the guard G can move from the beacon terminal A to the B to the C, but the guard G can move directly from the beacon terminal A to the beacon terminal C without going through the beacon terminal B, I, or the like. It turns out that you can't. Here, in the position estimation process using the route condition, referring to the table of FIG. 78, since the beacon C does not exist in the movable destination of the beacon A, the beacon terminal is used as the route immediately after the beacon terminal A from the detection data. Even if C is recognized, it is not presumed that the guard G is in the vicinity of the beacon terminal C.

When the route determination unit 250 receives the beacon signal from the beacon terminal 300, the beacon terminal 300 described as the source of the beacon signal in the detection data refers to the route condition shown in FIG. 7 and determines the route condition. Determine if it meets or not.

The communication unit 220 transmits detection data to the center server 100 when the route determination unit 250 determines that the beacon signal satisfies the route condition, and in principle, when it is determined that the route condition is not satisfied, the communication unit 220 transmits the detection data. The detection data is not transmitted to the center server 100.

However, even if the route determination unit 250 determines that the beacon signal does not satisfy the route condition, if the detection data contains abnormality information, the detection data is transmitted to the center server 100. ..

When the abnormality determination unit 260 receives a signal from the beacon terminal 300 that does not satisfy the above-mentioned route condition and next detects a signal transmitter that satisfies the route condition of the beacon terminal 300, the abnormality determination unit 260 is not detected (skipped) in the route. ) The beacon terminal 300 is determined as abnormal.

That is, the abnormality determination unit 260 receives a signal from the first beacon terminal, subsequently receives a signal from the second beacon terminal that does not satisfy the route condition from the first beacon terminal, and subsequently receives the signal from the second beacon terminal. When a signal is received from a third beacon terminal that satisfies the route condition from the beacon terminal, an abnormality is found in the beacon terminal located on the route between the first beacon terminal and the second beacon terminal in the route condition. Judge that it has occurred.

In this case, the communication unit 220 transmits the abnormality information to the center server 100. The state management unit 150 of the center server 100 that has received the abnormality information determines that the guard G has passed the beacon terminal 300 determined to have the abnormality.

(Functional block of beacon terminal)
As shown in FIG. 3, the beacon terminal 300 has a short-range communication unit 310, a storage unit 320, and an abnormality determination unit 330 as functional blocks.

The short-range communication unit 310 transmits the above-mentioned beacon signal including the identification information (beacon ID) of the beacon terminal 300 as radio waves or sound waves. The transmission interval of the beacon signal is set to 1 time / second, and the reception interval is set to 1 time (continuous for 5 seconds) / hour, but the present invention is not limited to these. Further, for short-range communication, for example, Bluetooth (registered trademark) such as BLE (Bluetooth (registered trademark) Low Energy), sound wave, or the like is used.

Further, the short-range communication unit 310 includes the abnormality information determined by the abnormality determination unit 330, which will be described later, and the abnormality information received from the other beacon terminal 300 in the signal to be transmitted, and transmits the information.

The storage unit 320 stores the beacon ID, identification information of another beacon terminal 300 within a predetermined distance range (for example, within several meters) and capable of communication, information received from the other beacon terminal 300, and the like.

Further, the storage unit 320 holds the abnormality information including the beacon ID of the other beacon terminal 300 for a predetermined holding period after the abnormality determination unit 330 determines that the other beacon terminal 300 is abnormal.

Further, the storage unit 320 stores the number of times that any mobile terminal 200 receives the beacon signal from the beacon terminal 300. The number of times is stored as the number of times the connection is confirmed from the mobile terminal 200 at the time of transmitting the beacon signal.

If the abnormality determination unit 330 does not receive a signal from another beacon terminal 300 within a predetermined distance range (for example, within a few meters) for a predetermined time (for example, 1 hour) or more, the abnormality determination unit 330 determines that an abnormality has occurred in the beacon terminal 300. Further, the abnormality determination unit 330 detects the remaining amount of the battery of the beacon terminal 300, and when the remaining amount of the battery becomes equal to or less than a predetermined threshold value (for example, when the battery runs out in a few hours), it is said that an abnormality has occurred. It may be determined.

Further, the abnormality determination unit 330 sets the retention period for each time zone in which an abnormality occurs or the abnormality information is acquired according to the history information including the time when the signal is notified to the mobile terminal 200 by the short-range communication unit 310. .. The passage frequency of the guard G in the security target facility B is acquired from the number of times the signal is notified per predetermined unit time (for example, one hour) obtained from this history information, and the retention period is set for each time zone according to this passage frequency. Can be set.

For example, a long retention period (for example, 12 hours) is set for an abnormality that occurs during the night time when the security guard G passes infrequently, and an abnormality that occurs during the daytime when the security guard G passes frequently. The retention period is set short (eg 3 hours).

This retention period can be applied to the same time zone on another day. Further, specifically, referring to the history information, the number of signal notifications from 0:00 to 5:00 is 0, the number of signal notifications from 5:00 to 6:00 is 1, and the signal notification from 12:00 to 15:00. When the information that the number of times is 5 is acquired, the retention period is set to be long (for example, 12 hours) from 0:00 to 6:00 when the number of notifications is small (low traffic frequency), and the number of notifications is large (traffic frequency). From 12:00 to 15:00, the retention period is set short (for example, 3 hours).

The method of setting the retention period is not limited to this, and the retention period in the next time zone may be dynamically set based on the traffic frequency in the latest predetermined unit time (for example, 1 hour). That is, since the traffic frequency at 0 o'clock is low, the retention period may be set longer in the next time zone (for example, 1 o'clock).

Further, the abnormality determination unit 330 may set the number of times of transfer of abnormality information in the same manner in addition to the holding period.

Further, when the abnormality determination unit 330 notifies any of the mobile terminals 200 of the abnormality information even before the retention period has elapsed (after transmitting the beacon signal including the abnormality information, the connection confirmation with the mobile terminal 200 is confirmed. If it is obtained), the abnormality information is deleted from the storage unit 320, and the transmission of the abnormality information is terminated.

However, the beacon terminal 300 other than the beacon terminal 300 that has notified the abnormal information to any of the mobile terminals 200 will continue to transmit the abnormal information. Therefore, the beacon terminal 300 that has notified the abnormality information to any of the mobile terminals 200 transmits the abnormality notified information instead of the abnormality information, and the abnormality determination unit 330 of the other beacon terminal 300 transmits the notified information. Upon reception, the abnormality information corresponding to the beacon ID included in the abnormality information is deleted, and the transmission of the abnormality information is terminated.

[System operation]
Next, the operation of the position estimation system configured as described above will be described. The operation is executed by the cooperation between the hardware such as the CPU and the communication unit of the center server 100, the mobile terminal 200 and the beacon terminal 300, and the software stored in the storage unit. In the following description, for convenience, unless otherwise specified, the CPU of each device is the main operating unit.

(Processing when an abnormality occurs)
Next, the processing of the system when an abnormality occurs in any of the beacon terminals 300 will be described. FIG. 8 is a diagram showing the processing of the system when an abnormality occurs.

As shown in the figure, when an abnormality occurs in any of the beacon terminals 300 (for example, when the signal from the beacon 1 cannot be received due to theft; the same figure (1) and (2)), between the beacon terminals 300. The abnormality information is transmitted (Fig. (3)), the abnormality information is notified to the mobile terminal 200 that has read the beacon terminal 300 (Fig. (4)), and the mobile terminal 200 that has received the abnormality information sends the abnormality information to the center server 100. Notify the abnormality information (Fig. (5)).

FIG. 9 is a diagram showing a flow of notification processing by the mobile terminal 200 when an abnormality occurs in the beacon terminal 300.

As shown in the figure, the CPU 21 of the mobile terminal 200 determines whether or not the beacon signal has been received (step 111).

When it is determined that the beacon signal has been received (Yes), the CPU 21 (route determination unit 250) determines whether the beacon terminal 300 that is the source of the beacon signal is the beacon terminal 300 that satisfies the route condition, and the signal. It is determined whether or not the intensity is equal to or higher than the above threshold value (step 112).

When it is determined that any of the above conditions is satisfied (Yes), the CPU 21 (communication unit 220) transmits the detection data to the center server 100 (step 113).

On the other hand, when it is determined that any of the above conditions is not satisfied (No), the CPU 21 determines whether or not the detection data includes abnormality information (step 114).

When it is determined that the detection data includes abnormality information (Yes), the CPU 21 (communication unit 220) transmits the detection data to the center server 100 (step 113).

Further, as described above, the CPU 21 (abnormality determination unit 260) of the mobile terminal 200 determines the abnormality of the beacon terminal 300 by itself, not only when the abnormality information is received from the beacon terminal 300, and determines the abnormality information by the center server 100. You can also send to.

For example, in the detection data shown in FIG. 6, after recognizing the beacon G at t13, the beacon D that does not satisfy the route condition from the beacon G is recognized at t14, and the beacon C that satisfies the route condition from the beacon D is generated at t15. It has recognized.

In this case, the abnormality determination unit 260 estimates that an abnormality has occurred in the beacon J that normally passes between the beacon G and the beacon D, and generates abnormality information including the beacon ID of the beacon J. And sends it to the center server 100. In this case, the state management unit 150 of the center server 100 manages the abnormality information of the beacon G, and the position estimation unit 140 estimates that the guard G has passed the beacon J.

(Processing at the time of abnormal recovery)
Next, the processing of the system when the abnormality generated in the beacon terminal 300 is recovered will be described.

FIG. 10 is a flowchart showing the flow of abnormality determination processing of the center server 100 at the time of abnormality recovery of the beacon terminal 300.

As shown in the figure, whether the CPU 11 (abnormality recovery determination unit 180) of the center server 100 has input the recovery completion information to the state management unit 150 based on, for example, a report from the guard G notifying the completion of the recovery. (Step 121).

When it is determined that the recovery completion information has been input (Yes), the CPU 11 (abnormality recovery determination unit 180) is a beacon terminal 300 via which the abnormality information is transmitted from the beacon terminal 300 in which the abnormality has occurred to the mobile terminal 200. An abnormality ignoring period is set according to the number of routes (step 122).

Subsequently, the CPU 11 (timekeeping unit 170) starts timing the elapsed time from the input of the restoration completion information (step 123).

Subsequently, the CPU 11 determines whether or not the abnormality information has been received from the mobile terminal 200 (step 124).

When it is determined that the abnormality information has been received (Yes), the CPU 11 (timekeeping unit 170) determines whether or not the elapsed time has elapsed the abnormality ignoring period (step 125).

When it is determined that the abnormality ignoring period has elapsed, the CPU 11 (abnormality recovery determination unit 180) determines that the received abnormality information is a new abnormality, and causes the state management unit 150 to manage it (step 126).

On the other hand, when it is determined that the abnormality ignoring period has not elapsed, the CPU 11 (abnormality recovery determination unit 180) determines that the abnormality information has been dealt with (step 127).

For example, the abnormality information received from the beacon 2 shown in FIG. 8 is determined to have been dealt with for one hour, which is the abnormality ignoring period, after the abnormality recovery of the beacon 1 (number of routes 1). Further, the abnormality information received from the beacon 7 is determined to have been dealt with for 4 hours, which is the abnormality ignoring period, after the abnormality recovery of the beacon 1 (number of routes 4).

(Delete processing of abnormal information)
Next, a process of deleting the abnormal information from the beacon terminal 300 will be described. FIG. 11 is a diagram for explaining the processing of the system regarding the deletion of the abnormality information.

As shown in the figure, the beacon terminal 4 deletes the abnormality information when the retention period elapses after the generation of the abnormality information, and also notifies the mobile terminal 200 of the abnormality information (connection with the mobile terminal 200 is confirmed). And), the abnormal information is deleted (Fig. (1')), and the notified information is transmitted (Fig. (2')). The beacon terminal 3 that has received the notified information deletes the corresponding abnormality information (Fig. (3')). Further, when a signal is received from the restored beacon terminal 1, the abnormality information is similarly deleted ((1) to (4) in the figure).

FIG. 12 is a flowchart showing the flow of the abnormality information deletion process by the beacon terminal 300.

As shown in the figure, whether or not the CPU 31 (abnormality determination unit 330) of the beacon terminal 300 has detected an abnormality, that is, a beacon from another beacon terminal 300 in a predetermined distance range for a predetermined time (for example, 1 hour) or more. It is determined whether or not the signal has been received (step 141).

When it is determined that an abnormality has occurred in the other beacon terminal 300 (Yes), the CPU 31 (abnormality determination unit 330) generates abnormality information including the beacon ID of the other beacon terminal and holds it in the storage unit 320 (yes). Step 142).

Subsequently, the CPU 31 (abnormality determination unit 330) is the number of times (connected to the mobile terminal 200) that the beacon signal from the signal transmitter 300, which is obtained from the history information stored in the storage unit 320, is notified to the mobile terminal 200. Based on the number of confirmations), the number of notifications of the beacon signal to the mobile terminal 200 per most recent unit time (for example, 1 hour) is calculated (step 142).

Subsequently, the CPU 31 (abnormality determination unit 330) sets the retention period according to the calculated number of notifications (step 143). That is, the abnormality determination unit 330 sets the retention period longer as the number of notifications is smaller.

The number of notifications of the beacon signal per unit time to the mobile terminal 200 can be said to be the passage frequency of the guard G. Therefore, it is assumed that the abnormality determination unit 330 has a long transmission time of abnormality information when the passage frequency of the security guard G is low, and a short transmission time of the abnormality information when the passage frequency of the security guard G is high. Therefore, the retention period can be dynamically changed according to the passage frequency of the guard G, and the retention time corresponding to the expected transmission time of the abnormal information can be set.

For example, the traffic frequency is divided into multiple stages such as "high" and "low" according to the number of notifications, and the retention period is set to 3 hours in the time zone of "high" traffic frequency (for example, 12:00 to 15:00). However, in the case of a time zone where the traffic frequency is "low" (for example, from 0:00 to 6:00), the retention period can be set to 12 hours. As a result, an appropriate retention period can be set for each time zone according to the traffic frequency. However, the method of setting the retention period is not limited to this.

Subsequently, the abnormality determination unit 330 determines whether or not the above-set retention period has elapsed (step 145).

When it is determined that the retention period has elapsed (Yes), the abnormality determination unit 330 deletes the abnormality information from the storage unit 320 (step 146).

When it is determined that the retention period has not elapsed (No), the abnormality determination unit 330 confirms whether or not the abnormality information has been notified to the mobile terminal 200, that is, the reception of the beacon signal including the abnormality information by the mobile terminal 200 is confirmed. It is determined whether or not it was possible (step 147).

When it is determined that the abnormality information has been notified to the mobile terminal 200 (Yes), the abnormality determination unit 330 deletes the abnormality information from the storage unit 320 (step 146).

When it is determined that the abnormality information has not been notified to the mobile terminal 200 (No), the abnormality determination unit 330 determines whether or not the beacon signal has been received from the beacon terminal 300 (beacon 1 in FIG. 11) recovered from the abnormality. Determine (step 148).

When it is determined that the beacon signal has been received from the restored beacon terminal 300 (Yes), the abnormality determination unit 330 deletes the abnormality information from the storage unit 320 (step 146).

[summary]
As described above, according to the present embodiment, in the position estimation system of the guard G using a plurality of beacon terminals 300, the abnormality generated in the beacon terminal 300 is promptly generated regardless of the installation location of the beacon terminal 300. Can be detected.

Further, it is possible to prevent the same abnormality information from being repeatedly notified to the mobile terminal 200 and the center server 100 while reliably notifying the mobile terminal 200 and the center server 100 of the abnormality information.

[Modification example]
The present invention is not limited to the above-described embodiment, and can be variously modified without departing from the gist of the present invention.

In the above-described embodiment, the mobile terminal 200 has a route determination unit 250, receives a beacon signal from a first beacon terminal 300 that does not satisfy the route condition, and then receives a beacon signal from the second beacon terminal 300 that satisfies the route condition. Was received, it was determined that an abnormality had occurred in the beacon terminal 300 located on the path between the first beacon terminal 300 and the second beacon terminal 300. However, the center server 100 may be responsible for the processing of the route determination unit 250. That is, the center server 100 executes the same processing as the route condition determination unit 250 for the detection data received from the mobile terminal 200, and the security guard G passes in front of the beacon terminal 300 determined to have an abnormality. It is determined that it has been done.

In the above-described embodiment, the abnormality determination unit 330 of the beacon terminal 300 notifies the mobile terminal 200 of the beacon signal from the beacon terminal 300 per unit time (traffic frequency of the guard G). The retention period was set. However, the parameters used to set the retention period are not limited to this. For example, the abnormality determination unit 330 provides information (unit time) regarding the number (number of machines) per unit time (for example, one hour) of the beacon terminal 300 that has transmitted a beacon signal from the center server 100 to any of the mobile terminals 200. The number of beacon terminals 300 that have notified the signal to the mobile terminal 200) may be received, and the smaller the number is, the longer the retention period may be set. Further, by including the information indicating that the signal is notified to any of the mobile terminals in the latest unit time in the signal transmitted by the beacon terminal 300, the beacon terminal 300 does not have to communicate with the center server 100. It is possible to acquire the number of beacon terminals 300 that communicate with the mobile terminal 200 per unit time. It should be noted that the smaller this number is, the narrower the range in which the guard G arranged in the space moves (covers) in the space. That is, the beacon terminal 300 detects the range in which the guard G arranged in the space moves (covers) in the space based on the history information of the plurality of beacon terminals 300 for each time zone, and sets the retention period for each time zone. Set. As a result, the retention period is dynamically changed according to the range in which the guard G placed in the space moves (covers) in the space, and the retention time corresponding to the expected transmission time of abnormal information is set. can do. For example, the movement range of the guard G is divided into multiple stages such as "wide" and "narrow" according to the above number of aircraft, and if the movement range is "wide" (for example, from 12:00 to 15:00), the retention period Can be set to 3 hours, and the retention period can be set to 12 hours in the case of a time zone of "narrow" movement range (for example, 0:00 to 6:00). However, the method of setting the retention period is not limited to this.

In addition, the abnormality determination unit 330 receives information on the current number of guards G assigned to the security target facility B from the center server 100, for example, periodically or when an abnormality occurs, and accordingly. The smaller the number of guards G, the longer the retention period may be set.

Further, in the present embodiment, the position estimation of the guard during the security work has been described using this system, but the scope of application of the present invention is not limited to this. For example, it can be applied to the position estimation of workers who work at various sites such as staff of airports and department stores and cleaners who perform cleaning work.

Further, in the present embodiment, the center server 100 is responsible for the threshold setting process and the position estimation process, but the mobile terminal 200 may be responsible for each of the processes. In this case, the mobile terminal 200 has a functional block corresponding to the storage unit 120, the threshold value setting unit 130, and the position estimation unit 140, as well as hardware and a program.

Further, in the present embodiment, the mobile terminal 200 transmits the detection data in which the identification information of the beacon terminal 300 and the signal strength are associated with each other to the center server 100, but the mobile terminal 200 performs the threshold setting process and the position estimation. When performing the processing, the signal strength information may not be transmitted to the center server 100, but at least the identification information may be transmitted as detection data. The mobile terminal 200 may transmit the position information of the guard G who carries the mobile terminal 200, which is estimated by the position estimation process, to the center server 100.

Among the inventions described in the claims of the present application, the invention described as "position information estimation method" is one in which at least one device such as a computer automatically performs each step by information processing by software. This is not something that humans do using devices such as computers. That is, the "position information estimation method" is a position information estimation method by computer software, and is not a method in which a human operates a calculation tool called a computer.

11, 21, 31 ... CPU
150 ... Status management unit 170 ... Timekeeping unit 180 ... Abnormality recovery determination unit 220 ... Communication unit 240 ... Storage unit 250 ... Route determination unit 260 ... Abnormality determination unit 310 ... Short-range communication unit 320 ... Storage unit 330 ... Abnormality determination unit 100 ... Center server 200 ... Mobile terminal 300 ... Beacon terminal B ... Security target facility G ... Security guard

Claims (7)

An anomaly detection system that notifies a mobile terminal carried by a worker working at the facility of an abnormality that has occurred in any of a plurality of signal transmitters installed in the space of the facility to be managed.
The signal transmitter is
A communication unit that can communicate with other signal transmitters and the mobile terminal within a predetermined distance range and transmits a signal including its own identification information.
An abnormality determination unit that determines the presence or absence of an abnormality in the signal transmitter, and
A memory including history information including a time when the signal is notified to the mobile terminal, and storage of abnormality information indicating the abnormality for a predetermined holding period after the abnormality determination unit determines the abnormality. With a part,
The abnormality determination unit sets the retention period for each time zone according to the history information, and sets the retention period.
The communication unit transmits a signal including the abnormality information during the retention period.
The mobile terminal has a short-range communication unit that receives the signal from the signal transmitter existing within a predetermined distance range.
Anomaly detection system. The abnormality detection system according to claim 1, wherein the abnormality determination unit sets the retention period longer as the number of times notified per predetermined unit time is smaller. The communication unit acquires information on the number of signal transmitters that have notified the mobile terminal of the signal per predetermined unit time.
The abnormality detection system according to claim 1, wherein the abnormality determination unit sets the retention period longer as the number of machines is smaller. The abnormality according to any one of claims 1 to 3, wherein the storage unit deletes the abnormality information when the mobile terminal is notified of the abnormality information even before the retention period has elapsed. Detection system. When the communication unit notifies the mobile terminal of the abnormality information, the communication unit transmits the notified information of the abnormality information.
The abnormality detection system according to claim 4, wherein the other signal transmitter that has received the notified information deletes the corresponding abnormality information. This is an abnormality detection method that notifies a mobile terminal carried by a worker working at the facility of an abnormality that has occurred in any of a plurality of signal transmitters installed in the space of the facility to be managed.
A signal including the identification information of each signal transmitter is transmitted from each of the signal transmitters.
Each of the signal transmitters determines the presence or absence of an abnormality in the signal transmitter, and determines the presence or absence of an abnormality.
During a predetermined retention period after the determination of the abnormality, the abnormality information indicating the abnormality is stored, and the retention period is set according to the history information including the time when the signal is notified to the mobile terminal. Set for each band,
During the retention period, a signal containing the abnormality information is transmitted,
An abnormality detection method in which the mobile terminal receives the signal from the signal transmitter existing within a predetermined distance range. For signal transmitters installed in the space where workers carrying mobile terminals work
A step of transmitting a signal including identification information of each signal transmitter from each of the signal transmitters,
Each of the signal transmitters has a step of determining the presence or absence of an abnormality in the signal transmitter.
A step of storing abnormality information indicating the abnormality for a predetermined retention period after the determination of the abnormality, and a step of storing the abnormality information indicating the abnormality.
A step of setting the retention period for each time zone according to history information including the time when the signal is notified to the mobile terminal, and
During the retention period, the step of transmitting a signal containing the abnormality information and
A program to execute.

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