JP2017067566A - Terminal device and detection program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect a transmitter which causes change in environments of positioning.SOLUTION: A terminal device 100 includes: an acquisition part 110, which acquires a BSSID for specifying the RSSI of a beacon signal from a transmitter and a transmitter; and a detection part 120, which compares the RSSI of a beacon signal sent from a transmitter in an initial state and the RSSI acquired by the acquisition part 110 and detects a transmitter in an abnormal state on the basis of the comparison result and the BSSID acquired by the acquisition part 110.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a terminal device and a detection program.

  In recent years, it has been proposed to perform positioning using short-range wireless communication technology in indoors where reception of GPS (Global Positioning System) radio waves is difficult (see, for example, Patent Document 1).

JP 2012-88237 A

  As a positioning method using short-range wireless communication technology, a wireless signal (for example, a beacon signal) from a transmitter is received by a terminal device such as a smartphone, and the position of the terminal device is specified based on the reception level of the wireless signal. There is. When such a technique is used, if the transmitter is moved, lost, deteriorated, damaged, etc., the positioning environment may change due to, for example, fluctuations in the reception level of the radio signal, and the position of the terminal device may not be specified. . For this reason, when the positioning environment changes, it is desirable to be able to detect the transmitter that causes the change.

  The present invention has been made in view of the above problems, and an object thereof is to detect a transmitter that causes a change in positioning environment.

  A terminal device according to an aspect of the present invention is a terminal device for detecting a transmitter in an abnormal state in an area where a plurality of transmitters are arranged at predetermined positions, and receiving a radio signal from the transmitter An acquisition means for acquiring transmitter information for specifying a level and a transmitter, a reception level of a radio signal when a radio signal is transmitted from the transmitter under a predetermined condition, and a reception level acquired by the acquisition means And detecting means for detecting a transmitter in an abnormal state based on the comparison result and the transmitter information acquired by the acquiring means.

  The detection program according to one aspect of the present invention provides a computer provided in a terminal device for detecting a transmitter in an abnormal state in an area where a plurality of transmitters are arranged at predetermined positions, from the transmitter. The acquisition means for acquiring the radio signal reception level and transmitter information for specifying the transmitter, and the radio signal reception level and acquisition means when the radio signal is transmitted from the transmitter under a predetermined condition The reception level is compared, and based on the comparison result and the transmitter information acquired by the acquisition unit, the reception level is made to function as a detection unit that detects a transmitter in an abnormal state.

  In the terminal device and the detection program, the reception level and transmitter information of the radio signal from the transmitter are acquired, and the reception level of the radio signal and the acquired reception level when transmitted from the transmitter under a predetermined condition are obtained. To be compared. The reception level of the radio signal when the radio signal is transmitted from the transmitter under a predetermined condition is, for example, the reception level of the radio signal when the transmitter is not moved, lost, deteriorated, or damaged. The radio signal from the transmitter can be used for positioning of the terminal device, for example. When such a transmitter moves, is lost, deteriorated, damaged, etc., the positioning environment changes, and it is assumed that the reception level of the acquired radio signal is different from the reception level of the radio signal under a predetermined condition. The In the said terminal device and a detection program, the transmitter in an abnormal state is detected based on both comparison results and the acquired transmitter information. Since the transmitter in the abnormal state is, for example, a transmitter in a state of movement, loss, deterioration, breakage, etc., the transmitter that causes a change in the positioning environment is detected.

  The detection means may detect a transmitter in an abnormal state based on the reception level of the radio signal from the transmitter acquired by the acquisition means and the acquisition order of the transmitter information acquired by the movement of the terminal device in the area. . In this way, it is possible to detect a transmitter that causes a change in the positioning environment.

  The detection means may compare the combination of the reception levels of the respective radio signals when the radio signal is transmitted from the transmitter under a predetermined condition and the combination of the reception levels of the respective radio signals acquired by the acquisition means. . In this way, it is possible to detect a transmitter that causes a change in the positioning environment.

  The terminal device determines the abnormal state of the transmitter detected by the detection unit based on the reception level of the radio signal from the transmitter acquired by the acquisition unit and the history of the transmitter information acquired by the movement of the terminal device in the area. Determination means, wherein the predetermined condition includes an output level of the radio signal of the transmitter and an installation location of the transmitter, and the abnormal state is a first state in which the transmitter does not transmit the radio signal. The second state where the output level of the radio signal of the transmitter is lower than the output level of the radio signal of the transmitter under a predetermined condition, and the installation location of the transmitter under the predetermined condition The determination unit may determine that the transmitter detected by the detection unit is in any one of the first to third states. The reception level of radio signals and the history of transmitter information acquired with the movement of the terminal device may include information on the reception levels of radio signals from the transmitter at each position. By using such a history, the transmitter has stopped outputting a radio signal (corresponding to the first state described above), and the output level of the transmitter's radio signal has been reduced (the above-described second state). It is possible to determine an abnormal state of the transmitter, such as that corresponding to the state), that the transmitter has moved (corresponding to the above third state).

  When the determination unit determines that the transmitter in the abnormal state is in the third state, the detection unit may detect the installation location of the transmitter. Thereby, for example, when the transmitter moves, the destination of the transmitter can be detected.

  The detection means may detect the position where the reception level of the radio signal from the transmitter in the abnormal state is maximum as the installation location of the transmitter. Since the position where the reception level of the radio signal from the transmitter is the maximum can be estimated as the position closest to the transmitter, the location of the transmitter can be determined by detecting such a position as the installation location of the transmitter. Can be detected.

  According to the present invention, it is possible to detect a transmitter that causes a change in positioning environment.

It is a figure for demonstrating the outline | summary of the method of positioning by embodiment. It is a figure which shows the functional block of a terminal. It is a figure which shows an example of abnormal individual DB memorize | stored in a memory | storage part. It is a figure for demonstrating the relationship between each position and RSSI of a beacon signal. It is a figure which shows an example of the difference of RSSI of each beacon signal, and RSSI in an initial state. It is a figure which shows an example of the hardware constitutions of a terminal. It is a figure which shows an example of a structure of a detection program. It is a 1st flowchart which shows an example of the process performed in a terminal. It is a 2nd flowchart which shows an example of the process performed in a terminal.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant descriptions are omitted.

  The terminal device according to the embodiment detects a transmitter in an abnormal state in a predetermined area. The terminal device may perform positioning in a predetermined area. The terminal device may be realized as a mobile terminal device such as a smartphone. The predetermined region is a region including a predetermined building, and such a region may hereinafter be simply referred to as a building. The building may be an outdoor facility. In a building, a plurality of transmitters are arranged at predetermined positions, whereby a plurality of nodes and links between the nodes are set. A node is an abstracted position in a building. The link indicates a connection path of each node. With such a structure using nodes and links (node / link structure), each position in the building is abstractly shown. For example, the position of the terminal device in a building can be specified (positioning) based on the information on which node the terminal device is staying at. Moreover, the movement path | route of the terminal device in a building can also be specified based on the information on which link (path | route) the terminal device moved along.

  The transmitter transmits a short-range wireless signal. The short-range wireless signal is a beacon signal that can be received within a range of several meters to several tens of meters from the transmitter, for example. As the beacon signal, for example, a WiFi (registered trademark) signal and a BLE (Bluetooth (registered trademark) Low Energy) signal may be used.

  FIG. 1 is a diagram for explaining the relationship between a transmitter arranged in a building and a node / link structure. FIG. 1A schematically shows a state in which a call is placed in a building. FIG. 1B shows a node / link structure corresponding to FIG. The transmitter may be arranged outside the building.

  In the example shown in FIG. 1A, the building 1 is assumed to be a store such as a supermarket. However, the building 1 is not limited to this example. In the building 1, a shelf 2 facing the passage 3 is arranged. A plurality of transmitters T are arranged in the building 1. In addition, the code | symbol from which TA-TF differs is attached | subjected to the transmitter T so that each transmitter can be distinguished. The transmitter T may be disposed at a connection point of each passage 3. In this example, transmitters TA to TF are disposed at connection points of the respective passages 3.

  As described above, the transmitter T transmits a beacon signal. Therefore, at each position P of the building 1, RSSI (Received Signal Strength Indicator) indicating the reception level of the beacon signal from each transmitter T is measured in advance, and a node N that abstractly indicates the measurement location is set. In addition, in order to distinguish each position, the different code | symbol of P1-P7 is attached | subjected to the position P. FIG. Further, different symbols N1 to N7 are attached to the node N so that the nodes can be distinguished. Nodes N1 to N7 correspond to the positions P1 to P7, respectively.

  As shown in FIG. 1B, the link L is set between the nodes N1 to N7. The link L is a path that can transit between the nodes N1 to N7. The link L can correspond to, for example, only a route that can be moved by the user of the terminal device among all the routes connecting the nodes N1 to N7. In this case, the link L corresponds to the passage 3. The node / link structure shown in FIG. 1B may be represented by a directed graph. In this case, even if the link L is set between the same nodes N, the node N is linked to the other node. The property of the link L (for example, movement cost) may be different between the route toward the node N and the route from the other node N to the one node N.

  As described above, the floor map of the building 1 is abstracted as a node / link structure (graph structure). By using such a node / link structure, positioning can be performed in the building 1. For example, if the RSSI of the beacon signal from each transmitter T is acquired at a certain position of the building 1 and the acquired RSSI is compared (matched) with the previously measured RSSI described above, the position is determined. , Which node in the node link structure is located is specified. Since the node / link structure is an abstraction of the floor map of the building 1, if the position in the node / link structure is specified, the position in the building 1 is also specified therefrom.

  Here, the state of the transmitter T when the RSSI of the beacon signal from each transmitter T is measured in advance at each position of the building is referred to as an “initial state”. In the initial state, the transmitter T is placed under a condition that, for example, the output level of the beacon signal transmitted from the transmitter T is a predetermined level, and the installation location of the transmitter T is a predetermined location. Means that

  FIG. 2 is a diagram illustrating functional blocks of the terminal device according to the embodiment. As illustrated in FIG. 2, the terminal device 100 includes an acquisition unit 110, a detection unit 120, a determination unit 130, a control unit 140, a communication unit 150, and a storage unit 160.

  The acquisition unit 110 receives a beacon signal from the transmitter T, thereby acquiring RSSI (Received Signal Strength Indicator) of the beacon signal in the terminal device 100 and transmitter information for specifying the transmitter T ( Acquisition means). The transmitter information is, for example, a BSSID (Basic Service Set Identifier). The RSSI and transmitter information history acquired by the acquisition unit 110 can be stored in the storage unit 160 described later.

  In the example illustrated in FIG. 2, the acquisition unit 110 includes a WiFi signal reception unit 111 and a BLE signal reception unit 112. The WiFi signal receiving unit 111 is a part that receives a WiFi signal. When the beacon signal is a WiFi signal, the WiFi signal reception unit 111 receives the beacon signal. The BLE signal receiving unit 112 is a part that receives a BLE signal. When the beacon signal is a BLE signal, the BLE signal receiving unit 112 receives the beacon signal.

  The detection unit 120 is a part (detection means) that detects the transmitter T in an abnormal state. The transmitter T in the abnormal state is a transmitter T in a state different from the initial state. For example, the state in which the transmitter T has moved from the initial installation location to a different installation location, the state in which the transmitter T has been lost, etc. are abnormal states. In addition, the transmitter T is deteriorated, the output level of the beacon signal transmitted from the transmitter T is lower than the output level in the initial state, the transmitter T is damaged, etc., and the beacon signal is not transmitted. State. Note that the decrease in the output level of the beacon signal due to deterioration of the transmitter T is caused by, for example, a decrease in the battery voltage of the transmitter T. When the remaining amount of the battery becomes zero, the transmission of the beacon signal of the transmitter T is stopped.

  In the example shown in FIG. 2, the detection unit 120 includes an abnormal solid detection unit 121 and a movement destination detection unit 122. The abnormal solid detector 121 detects the transmitter T in an abnormal state. For example, when the RSSI of the beacon signal from the transmitter T acquired by the acquisition unit 110 is different from the RSSI of the beacon signal from the transmitter T in the initial state, the abnormal solid detection unit 121 transmits the beacon signal. The transmitter T to be detected is detected as the transmitter T in an abnormal state. In addition, it is determined by the determination part 130 mentioned later what kind of abnormal state the transmitter T detected by the abnormal solid detection part 121 is in an abnormal state. The movement destination detection unit 122 detects the movement destination of the transmitter T when the transmitter T in the abnormal state is moved from the installation location in the initial state. Further details of the detection method by the abnormal solid detection unit 121 and the movement destination detection unit 122 will be described later.

  The determination unit 130 is a part (determination unit) that determines the abnormal state of the transmitter T in the abnormal state detected by the detection unit 120. The determination of the abnormal state is to determine what abnormal state the transmitter T is in due to the above movement, loss, deterioration, breakage, or the like. The determination unit 130 determines the abnormal state of the transmitter T based on the RSSI of the beacon signal acquired from the transmitter T and the history of transmitter information acquired by the acquisition unit 110 as the terminal device 100 moves in the building 1. . Details of the determination method by the determination unit 130 will be described later.

  The control unit 140 is a part that performs overall control of the terminal device 100 by controlling each element included in the terminal device 100.

  The communication unit 150 is a part that communicates with the outside of the terminal device 100. For example, the communication unit 150 can additionally acquire or update various information stored in the storage unit 160 described later.

  The storage unit 160 is a part that stores various information necessary for processing executed by the terminal device 100. For example, the memory | storage part 160 matches and memorize | stores RSSI of the beacon signal from the transmitter T of the initial state in each position in the building 1, and transmitter information. This will be described later with reference to FIG. In addition, the storage unit 160 stores the RSSI of the beacon signal and the history of transmitter information (history information) in the terminal device 100 acquired by the acquisition unit 110. The history information describes, for example, each position in the building 1, the RSSI, and the BSSID of the transmitter T in association with each other. The history information may include time information. In addition, the storage unit 160 stores a program (detection program) for causing the terminal device 100 to execute processing necessary for detecting the transmitter T in which the terminal device 100 is in an abnormal state. The storage unit 160 stores information related to the transmitter T detected as the transmitter T in an abnormal state. This information is stored, for example, as an abnormal individual DB (Data Base) described below.

  FIG. 3 is a diagram illustrating an example of the abnormal individual DB stored in the storage unit 160. In the example shown in FIG. 3, the abnormal individual DB describes “BSSID”, “abnormal status”, and “destination” in association with each other.

  “BSSID” is an identifier for identifying the transmitter T, and is generally called a MAC address. In the example shown in FIG. 3, the BSSID is represented by a combination of a numerical value and an alphabet (such as “00: 00: 00: AA: BB: CC”).

  The “abnormal status” indicates the type of abnormal state of the transmitter T. In the example shown in FIG. 3, the abnormal status is represented by a character string (“stop”, “move”, “deteriorated”, etc.). The contents of the abnormal status are as described above.

  “Destination” indicates the installation location of the transmitter T after movement. In the example shown in FIG. 3, the movement destination is represented by a number (such as “13”). For example, a number (location ID) indicating each position in the node / link structure ((b) in FIG. 1) is defined, and “movement destination” indicates the location ID. Some place IDs may be identifiers indicating the node N. Note that the movement destination is set when the abnormal status is movement, and is not set otherwise (“NULL”).

  Next, an example of a technique for detecting the transmitter T in an abnormal state by the detection unit 120 will be described with reference to FIGS. 4 and 5.

  FIG. 4 shows an example of RSSI of a beacon signal from each transmitter T in an initial state at each position in a certain building. This measurement is performed using the function of the acquisition part 110 of the terminal device 100, for example. The horizontal axis of the graph in FIG. 4 indicates time, and the vertical axis indicates RSSI. Here, as illustrated in the lower side of the graph in FIG. 4, the terminal device 100 sequentially moves through the building 1 at a predetermined speed and receives RSSI of the beacon signal from each transmitter T. Thus, the RSSI at each time may be measured. In this case, the horizontal axis of the graph indicates time and also indicates each position in the building. In addition, in FIG. 4, the example of four transmitters, transmitter TA-TD, is shown.

  RSSIs of beacon signals from the respective transmitters TA to TD are indicated by curves CA to CD, respectively. At the position corresponding to each transmitter T (the position closest to the transmitter T), the RSSI of the beacon signal from the transmitter T is maximized. Here, a threshold is set for each RSSI of each beacon signal. Each threshold value is set to a value smaller than the maximum value of the corresponding beacon signal RSSI.

  The information given by the graph shown in FIG. 4 including the threshold value, that is, the RSSI of the beacon signal transmitted from the transmitter T in the initial state at each position in the building and the RSSI of each beacon signal are set. Information in which the threshold value and the transmitter information are associated with each other is stored in the storage unit 160 in advance. By referring to the information stored in the storage unit 160, the abnormal solid detection unit 121 of the detection unit 120 detects the transmitter T in the abnormal state. Specifically, the abnormal solid detection unit 121 compares the RSSI of the beacon signal in the terminal device 100 when the beacon is transmitted from the transmitter T in the initial state with the RSSI acquired by the acquisition unit 110. In the example illustrated in FIG. 4, the RSSI indicated by the curves CA to CD and the RSSI acquired by the acquisition unit 110 are compared. For example, the RSSI acquired by the acquisition unit 110 is compared with the threshold value at a position where the RSSI indicated by each of the curves CA to CD is predicted to be larger than the corresponding threshold value. In that case, the comparison result is a result of whether or not the acquired RSSI is larger than the threshold value. Then, the abnormal solid detector 121 detects the transmitter T in an abnormal state based on the comparison result and the transmitter information acquired by the acquisition unit 110. For example, the transmitter T corresponding to the BSSID of the beacon signal whose RSSI acquired by the acquisition unit 110 is equal to or less than the threshold is detected as the transmitter T in an abnormal state. This is because the RSSI of the beacon signal from the transmitter T that is actually acquired is significantly changed (decreased) relative to the level of the beacon signal from the transmitter T in the initial state, and there is some abnormality in the transmitter T. This is because it is considered that this occurs.

  Alternatively, the transmitter T in an abnormal state may be detected as follows. That is, when the terminal device 100 moves in order through each position of the building 1, the terminal device 100 moves along each link N along each node N realized by each transmitter T. For example, in the example shown in FIG. 4, when the terminal device 100 moves in the order of the nodes N corresponding to the transmitters TA, TB, and TC, beacon signals from the transmitter TA and the transmitter TC are normally received. (For example, RSSI is larger than the threshold) On the other hand, when transmitter TB is in an abnormal state, the beacon signal from transmitter TB is not normally received (for example, RSSI is below the threshold or the beacon signal itself is not observed). Is assumed. That is, it is assumed that a beacon signal from the transmitter TA and a beacon signal from the transmitter TC are acquired in this order. In this case, on the node / link structure, the terminal device 100 has moved the node N realized by the transmitter TA and the node N realized by the transmitter TC in this order. Here, for example, in order for the node link structure to move from the node N realized by the transmitter TA to the node N realized by the transmitter TC, the node link structure must pass through the node N realized by the transmitter TB. If the node / link structure is required, the transmitter TB may be detected as being in an abnormal state in response to the movement of the node N realized by the transmitter TB without passing through the terminal device 100. it can. As described above, the abnormal solid detection unit 121 detects the transmitter T in the abnormal state based on the RSSI and BSSID acquisition order of the beacon signal from the transmitter T acquired by the acquisition unit 110 as the terminal device 100 moves. May be detected.

  In the example of FIG. 4 described above, the detection of the transmitter T in the abnormal state is determined based only on the RSSI of the beacon signal from the transmitter T, but the detection of the transmitter T in the abnormal state is The determination may be made based on RSSI of beacon signals from a plurality of transmitters T including other transmitters T. This will be described next with reference to FIG.

  FIG. 5 is a graph showing the difference between the RSSI of the beacon signal from the transmitter T in the initial state at each position and the RSSI of the beacon signal from each transmitter T acquired by the acquisition unit 110 at a certain position. It is. In addition, in FIG. 5, the example of six transmitters, transmitter TA-TF, is shown.

  In this example, three curves C1 showing the difference between the RSSI of the beacon signal from the transmitter T in the initial state at three different positions and the RSSI of the beacon signal from the transmitter T acquired by the acquisition unit 110. ~ C3 is shown. Of these, the RSSI difference indicated by the curve C3 is compared with the RSSI difference indicated by the curves C1 and C2, and only the RSSI difference of the beacon signal from the specific transmitter T is from the other transmitter T. This is greatly different from the RSSI difference of the beacon signal. Specifically, the RSSI difference of the beacon signals from the transmitters TA, TB, TD to TF is relatively small and close (within a range of 0 to 2), while the beacon signal from the transmitter TC Only the RSSI difference is relatively large (5 or more). Therefore, in this case, it can be estimated that an abnormality has occurred in the transmitter TC.

  Also according to such a principle, the abnormal solid detector 121 can detect the transmitter T in an abnormal state. That is, the abnormal solid detection unit 121 compares the RSSI combination of each beacon signal when the beacon signal is transmitted from the transmitter T in the initial state with the RSSI combination of each beacon signal acquired by the acquisition unit 110. However, the transmitter T in an abnormal state may be detected based on the comparison result and the transmitter information acquired by the acquisition unit 110.

  Next, the hardware configuration of the terminal device 100 will be described with reference to FIG. As illustrated in FIG. 6, the terminal device 100 physically includes one or a plurality of CPUs (Central Processing Units) 21, a RAM (Random Access Memory) 22, a ROM (Read Only Memory) 23, an imaging such as a camera. Device 24, communication module 26 that is a data transmission / reception device, auxiliary storage device 27 such as a semiconductor memory, input device 28 that receives an input of a user operation such as an operation panel (including operation buttons) or a touch panel, an output device 29 such as a display, Moreover, it can be configured as a computer including a reading device 2A such as a CD-ROM drive device. The function of the terminal device 100 in FIG. 2 is controlled by the CPU 21 by, for example, reading one or a plurality of programs stored in a storage medium M such as a CD-ROM with a reading device 2A and taking them into hardware such as a RAM 22. This is realized by operating the imaging device 24, the communication module 26, the input device 28, and the output device 29 under the above, and reading and writing data in the RAM 22 and the auxiliary storage device 27.

  FIG. 7 shows a module of a detection program for causing a computer to function as the terminal device 100. As shown in FIG. 7, the detection program P100 includes an acquisition module P110, a detection module P120, and a determination module P130. Each module implements the functions of the acquisition unit 110, the detection unit 120, and the determination unit 130 described above with reference to FIG.

  The detection program is provided by being stored in a storage medium, for example. The storage medium may be a flexible disk, CD-ROM, USB memory, DVD, semiconductor memory, or the like.

  Next, the operation of the terminal device 100 (detection method executed by the terminal device 100) will be described with reference to FIGS.

  FIG. 8 shows an overall flow of processing executed when the terminal device 100 detects the transmitter T in an abnormal state. This process is executed with the movement of the terminal device 100 in the building 1, for example. Note that each process can be executed by the control unit 140 unless otherwise specified.

  First, the terminal device 100 performs a beacon scan, and acquires the reception level and BSSID of surrounding beacons (step S10). Specifically, the acquisition unit 110 receives the beacon signal from the transmitter T located in the vicinity of the terminal device 100, thereby identifying the RSSI of the beacon signal in the terminal device 100 and the BSSID for identifying the transmitter T. To get.

  Next, the terminal device 100 detects an abnormal individual (step S20). Specifically, the abnormal solid detection unit 121 detects the transmitter T in the abnormal state using, for example, the method described above with reference to FIGS. 4 and 5.

  Next, the terminal device 100 determines whether there is an abnormal individual (step S30). If an abnormal individual is detected in the previous step S20, it is determined that there is an abnormal individual. If there is an abnormal individual (step S30: YES), the terminal device 100 advances the process to step S40. When that is not right (step S30: NO), the terminal device 100 complete | finishes the process of a flowchart.

  In step S40, the terminal device 100 performs an abnormal status determination. This process is executed by the determination unit 130. This process will be described with reference to FIG.

  As shown in FIG. 9, first, the terminal device 100 determines whether or not there is a place where a beacon signal from an abnormal individual can be observed (step S41). Specifically, the control unit 140 is in the abnormal state detected in the previous step S20 based on the RSSI acquired by the acquisition unit 110 stored in the storage unit 160 and the history (history information) of the transmitter information. It is determined whether there is a place where the beacon signal from the transmitter T is received. If there is a place where a beacon signal from an abnormal individual can be observed (step S41: YES), the terminal device 100 proceeds to step S43. When that is not right (step S41: NO), the terminal device 100 advances a process to step S42.

  In step S42, the terminal device 100 outputs “stop” as the abnormal status. Specifically, the determination unit 130 determines that the abnormal state of the transmitter T is “stop” described above with reference to FIG. This is because when the history information acquired with the movement of the terminal device 100 does not include a beacon signal from the transmitter T in which an abnormal state is detected (step S41: NO), the transmitter T This is because it can be determined that no signal is transmitted.

  In step S43, the terminal device 100 determines whether there is a place where the signal strength of the abnormal individual has increased. Specifically, the determination unit 130 determines whether or not there is a place where the RSSI of the beacon signal from the transmitter T in the abnormal state in the terminal device 100 is large, based on the history information stored in the storage unit 160. The For example, when the RSSI of the beacon signal from the transmitter T is larger than the corresponding threshold value (see FIG. 4), it is determined that there is a place where the RSSI is large. If there is a place where the signal strength of the abnormal individual has increased (step S43: YES), the terminal device 100 proceeds to step S45. When that is not right (step S43: NO), the terminal device 100 advances a process to step S44.

  In step S44, the terminal device 100 outputs “deteriorated” as the abnormal status. Specifically, the determination unit 130 determines that the abnormal state of the transmitter T is “deterioration” described above with reference to FIG. This is because when there is no place where the RSSI of the beacon signal from the transmitter T from which the abnormal state is detected is large in the history information acquired with the movement of the terminal device 100 (step S43: NO), the transmitter T This is because it can be determined that the output of the beacon signal has decreased.

  In step S <b> 45, the terminal device 100 outputs “move” as the abnormal status. Specifically, the determination unit 130 determines that the abnormal state of the transmitter T is “movement” described above with reference to FIG. 3. This is because when there is a place where the RSSI of the beacon signal from the transmitter T in which the abnormal state is detected is large in the history information acquired along with the movement of the terminal device 100 (step S45), the transmitter T is initial. This is because it can be determined that the current installation location has moved to another location.

  After the process of step S45 is completed, the terminal device 100 detects a movement destination (step S46). Specifically, the destination detection unit 122 refers to the history information stored in the storage unit 160, and the location where the RSSI of the beacon signal from the transmitter T in the abnormal state in the terminal device 100 is large is in the abnormal state. It is detected as the destination of the transmitter T. For example, the place where the RSSI of the beacon signal is maximum is detected as the destination of the transmitter T in an abnormal state. This is because it can be estimated that the position where the RSSI of the beacon signal from the transmitter T is the maximum is the position closest to the transmitter T.

  After the process of step S42, S44 or S46 is completed, the terminal device 100 advances the process to step S50 (FIG. 8).

  In step S50, the terminal device 100 registers the abnormal individual information in the abnormal individual DB. Specifically, an abnormality indicating the BSSID of the transmitter T in the abnormal state detected in the previous step S20 and the determination result (abnormal status and destination) of the transmitter T in the abnormal state determined in the previous step S40. Individual information is registered in the abnormal individual DB (FIG. 3).

  After the process of step S50 is completed, the terminal device 100 ends the process of the flowchart.

  Next, the effect of the terminal device 100 will be described. In the terminal device 100, the acquisition unit 110 acquires the RSSI of the beacon signal from the transmitter T and the BSSID of the transmitter T (step S10), and the abnormal solid detection unit 121 is transmitted from the transmitter T in the initial state. The RSSI is compared with the acquired RSSI (step S20). The RSSI of the beacon signal from the transmitter T in the initial state is, for example, the RSSI when the transmitter T is not moved, lost, deteriorated, damaged, or the like. As described above with reference to FIG. 1, the transmitter T is used for positioning of the terminal device in a predetermined area. When such a transmitter T is moved, lost, deteriorated, damaged, etc., the positioning environment changes, and the acquired RSSI is different from the RSSI transmitted from the transmitter T in the initial state. In the terminal device 100, the abnormal solid detector 121 detects the transmitter T in an abnormal state based on the comparison result between them and the BSSID of the acquired transmitter T (step S20). For example, the transmitter T in an abnormal state is detected by the method described above with reference to FIG. Thereby, the transmitter T that causes a change in the positioning environment can be detected. For example, the abnormal solid detection unit 121 detects a transmitter in an abnormal state based on the acquisition order of the beacon signal from the transmitter T acquired by the acquisition unit 110 and the BSSID as the terminal device 100 moves in the building 1. May be.

  In addition, the abnormal solid detection unit 121 compares each RSSI combination when the beacon signal is transmitted from the transmitter T in the initial state with each RSSI combination acquired by the acquisition unit 110, and the comparison result is obtained. Based on this, the transmitter T in an abnormal state may be detected (step S20). For example, the transmitter T in an abnormal state is detected by the method described above with reference to FIG. In this manner, the transmitter T that causes a change in the positioning environment can be detected.

  Moreover, in the terminal device 100, the determination part 130 is the history (history information) of RSSI of the beacon signal from the transmitter T acquired by the acquisition part 110 with the movement of the terminal device 100 in the building 1, and the BSSID of the transmitter T. Based on the above, the abnormal state of the transmitter T detected by the detector 120 is determined (step S40). Based on the history information, for example, the determination unit 130 can determine that the transmitter T is not transmitting a beacon signal (first state) (step S42). Moreover, the determination part 130 can also determine with the output level of the beacon signal of the transmitter T being a state (2nd state) lower than the output level of an initial state (step S44). Furthermore, the determination part 130 can also determine with the installation place of the transmitter T being a state (3rd state) different from the installation place of an initial state (step S45).

  In addition, when the determination unit 130 determines that the installation location of the transmitter T in the abnormal state is different from the initial installation location (step S45), the movement destination detection unit 122 installs the transmitter T. A place is detected (step S46). Thereby, when the transmitter T moves, the destination of the transmitter T can be detected.

  In that case, the movement destination detection unit 122 may set the position where the RSSI of the beacon signal from the transmitter T in an abnormal state is maximum as the installation location of the transmitter T (step S46). Since the position where the RSSI of the beacon signal from the transmitter T becomes the maximum can be estimated as the position closest to the transmitter T, by detecting such a position as the installation location of the transmitter T, the transmitter T Can be detected.

  Each function of the terminal device 100 described above can also be realized, for example, by executing a detection program in a computer.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment.

  For example, the terminal device 100 may communicate with a server (not shown) using the communication unit 150. In this case, for example, at least some of the functions of the detection unit 120, the determination unit 130, and the storage unit 160 of the terminal device 100 may be provided on the server side. Thereby, while reducing the processing burden in the terminal device 100, the structure of the terminal device 100 can be simplified. In this case, the system constituted by the terminal device 100 and the server corresponds to the terminal device according to the present invention.

  Moreover, when detecting the transmitter T in an abnormal state on the server side, the server side totals the acquisition results (step S10) such as RSSI by the terminal device 100, and based on the totaled data (statistical data) The transmitter T in an abnormal state may be detected. The acquisition result by the terminal device 100 here may be an acquisition result by a plurality of different terminal devices 100 respectively possessed by different users. Thus, the detection accuracy of the transmitter T in the abnormal state can be further increased by detecting the transmitter T in the abnormal state based on many acquisition results.

  DESCRIPTION OF SYMBOLS 100 ... Terminal device, 110 ... Acquisition part (acquisition means), 120 ... Detection part (detection means), 121 ... Abnormal solid detection part (detection means), 122 ... Destination detection part (detection means), 130 ... Determination part ( Determination means), 140 ... control unit, 150 ... communication unit, 160 ... storage unit.

Claims (7)

A terminal device for detecting a transmitter in an abnormal state in an area where a plurality of transmitters are arranged at predetermined positions,
An acquisition means for acquiring transmitter information for specifying a reception level of the radio signal from the transmitter and the transmitter;
The reception level of the radio signal when the radio signal is transmitted from the transmitter under a predetermined condition is compared with the reception level acquired by the acquisition unit, and the comparison result and the transmission acquired by the acquisition unit Detecting means for detecting a transmitter in an abnormal state based on the device information;
Comprising
Terminal device. The detection means is a transmitter in the abnormal state based on the reception level of the radio signal from the transmitter acquired by the acquisition means and the acquisition order of the transmitter information as the terminal device moves in the area. Detect
The terminal device according to claim 1. The detection means includes a combination of reception levels of radio signals when the radio signal is transmitted from the transmitter under the predetermined condition, and a combination of reception levels of radio signals acquired by the acquisition means. Compare,
The terminal device according to claim 1. Based on the reception level of the radio signal from the transmitter acquired by the acquiring unit and the history of transmitter information acquired by the movement of the terminal device in the area, the abnormal state of the transmitter detected by the detecting unit is determined. Determination means for determining,
Further comprising
The predetermined condition includes an output level of a radio signal of the transmitter, and an installation location of the transmitter,
The abnormal state is
A first state in which the transmitter is not transmitting the wireless signal;
A second state in which the output level of the radio signal of the transmitter is lower than the output level of the radio signal of the transmitter under the predetermined condition;
A third state where the installation location of the transmitter is different from the installation location of the transmitter under the predetermined condition;
Including
The determination means determines that the transmitter detected by the detection means is in any one of the first to third states;
The terminal device according to claim 1. The detection means detects an installation location of the transmitter when the determination means determines that the transmitter in an abnormal state is in the third state;
The terminal device according to claim 4. The detection means detects a position where the reception level of the radio signal from the transmitter in the abnormal state is maximum as an installation location of the transmitter.
The terminal device according to claim 5. A computer provided in a terminal device for detecting a transmitter in an abnormal state in an area where a plurality of transmitters are arranged at predetermined positions,
An acquisition means for acquiring transmitter information for specifying a reception level of the radio signal from the transmitter and the transmitter;
The reception level of the radio signal when the radio signal is transmitted from the transmitter under a predetermined condition is compared with the reception level acquired by the acquisition unit, and the comparison result and the transmission acquired by the acquisition unit Detecting means for detecting a transmitter in an abnormal state based on the device information;
Detection program to function as.

Images