Wireless LAN sensing system and method for identifying person using wireless LAN sensing system

Abstract

To provide a wireless LAN sensing system capable of identifying a detected person.SOLUTION: A wireless LAN sensing system 100 includes a wireless LAN sensing device 20 including a transmitter 10 configured to transmit a series of probe signals, a wireless communication unit 21 that receives the probe signals modulated by a person via a multipath channel, and a wireless LAN sensing unit 24 that detects the position and / or movement of the person by analyzing the received probe signals, and a wireless LAN access point 30 that acquires the unique identification information of the wireless communication terminal 40 through wireless communication with the wireless communication terminal 40. When the wireless LAN sensing device 20 detects an unidentified person, the owner of the wireless communication terminal 40 is searched for from the acquired unique identification information of the wireless communication terminal 40 and the owner is identified as the person detected by the wireless LAN sensing device 20.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a wireless LAN sensing system having a person identification function and a method for identifying a person using the wireless LAN sensing system. [Background technology]

[0002] The following inventions are disclosed regarding a wireless LAN sensing system and a method for identifying a person by wireless LAN sensing. Patent document 1 (JP Patent Publication No. 2010-218071) discloses an intrusion detection system that can detect whether or not a person has entered a monitored area and can easily determine whether the detected person is authorized to enter the monitored area. The intrusion detection system described in Patent Document 1 is an intrusion detection system that detects an intruder entering a predetermined monitoring area.A wireless signal monitoring device that measures the radio wave strength of a wireless signal transmitted by a wireless LAN access point is placed at a position within the monitoring area that is farthest from the access point.If the radio wave strength of the wireless signal from the access point measured by the wireless signal monitoring device falls below a radio wave strength threshold that is predetermined as the radio wave strength for detecting the presence of a person who has entered the monitoring area, it is determined that an intruder has entered the monitoring area.The wireless signal monitoring device is connected to a network, and when the wireless signal monitoring device detects an intruder who has entered the monitoring area, it notifies an alarm terminal used by an administrator via the network that an intruder has been detected.When the alarm terminal receives a notification from the wireless signal monitoring device that an intruder has been detected, it accesses the access point via the network and obtains terminal information specific to the terminal carried by the intruder who has entered the monitoring area.

[0003] Patent Document 2 (JP 2019-515703 A) discloses a device for human identification based on human wireless biometric information in a blind environment. The apparatus for human identification of Patent Document 2 is an apparatus for human identification, and includes a receiver configured to receive at least one wireless signal from a multipath channel affected by a person to be identified, a processor, and a memory communicably coupled to the processor, wherein the processor is configured to extract channel state information (CSI) from the at least one wireless signal, obtain wireless biometric information representing an influence of at least one wireless signal received from at least a part of the body of the person to be identified based on the CSI, and determine the identity of the person to be identified based on the wireless biometric information, and the receiver is further configured to receive a plurality of wireless signals from the multipath channel, each of the plurality of wireless signals being affected by a different person having a known identity, and the processor Further, the method is configured to extract CSI from each of the plurality of wireless signals, and obtain wireless biometric information based on each CSI, where each wireless biometric information represents an influence on the corresponding wireless signal from at least a portion of a different human body having a corresponding known identity, and to store each wireless biometric information in a database in association with the corresponding known identity, and the method includes: estimating a multipath profile based on the CSI extracted from each of the plurality of wireless signals; and mapping the different multipath profiles into a space based on a waveform design such that the similarity between the different multipath profiles is minimized and the distance between the different multipath profiles in the space is maximized.

[0004] Patent Document 3 (International Publication No. 2021 / 225191) discloses a method and apparatus for generating a user identification model based on wireless sensing in a wireless LAN system. In a method for a user identification device in a wireless local area network (WLAN) system described in Patent Document 3, the user identification device discovers a PED (personal electric device) and obtains identification information about the PED. The user identification device collects data and preprocesses the collected data based on the identification information about the PED. The user identification device generates a user identification model by learning from the preprocessed data.

[0005] Patent Document 4 (Japanese Patent Application Laid-Open No. 2016-52060) discloses an access point that more efficiently acquires location information of terminals communicating via wireless LAN. The access point described in Patent Document 4 is an access point that accommodates a terminal in its own network by executing a predetermined procedure between the access point and a terminal that receives a beacon signal transmitted from the access point, and when an association request signal is received from the terminal that received the beacon signal, requesting that the terminal belong to the access point, the access point is equipped with a control unit that, before completing the procedure, transmits the location information of the access point to a location information acquisition device that acquires the location information of the terminal as the location information of the terminal.

[0006] Patent Document 5 (JP 2020-203075 A) discloses a system and method for tracking movement amount, orientation, direction, rotation angle, scanning objects, respiratory rate monitoring, people counting, and person identification with high accuracy based on wireless channel information in a highly cluttered environment. The wireless monitoring system described in Patent Document 5 includes a transmitter configured to transmit a series of probe signals at a location via a wireless multipath channel; a receiver configured to receive, via the wireless multipath channel between the transmitter and the receiver, the series of probe signals modulated by the wireless multipath channel and an object moving at the location, and acquire time-series channel information (TSCI) of the wireless multipath channel from the series of probe signals modulated by the wireless multipath channel and the object; and a processor configured to monitor the movement of the object relative to a map based on the TSCI, determine an incremental distance traveled by the object within an incremental period based on the TSCI, and calculate a next position of the object on the map at a next time based on at least one of the object's current position at the current time, the incremental distance, and the direction of movement during the incremental period. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-218071 [Patent Document 2] Special Publication No. 2019-515703 [Patent Document 3] International Publication No. 2021 / 225191 [Patent Document 4] JP 2016-52060 A [Patent Document 5] Japanese Patent Publication No. 2020-203075 Summary of the Invention [Problem to be solved by the invention]

[0008] In addition to wireless LAN sensing, methods for detecting and identifying people in specific locations include PIR (infrared) sensors, millimeter-wave radar, and indoor network cameras. Of these, PIR sensors are easy to install and take privacy into consideration, but they have a limited coverage area and are prone to false positives because they only detect motion. Millimeter-wave radar can protect privacy and provide precise detection, but it is expensive, requires professional installation, and has limited coverage. Indoor network cameras have issues with privacy protection as they identify individuals, and they are limited to a line of sight, resulting in blind spots. In contrast, sensing using wireless LAN, standardized as IEEE802.11bf, has the advantages of being easy to set up and requiring no construction work, being able to cover a wide area, enabling detailed detection, and being able to respect privacy. However, with conventional wireless LAN sensing, while it is possible to detect human movement in a specific location, it is not possible to identify individuals as is the case with security and surveillance cameras. Therefore, even if a burglary occurs, there are issues with identifying individuals, such as not being able to prove that the arrested suspect committed the crime, or not being able to determine which family members are moving. Therefore, when using wireless LAN sensing, there is a demand to be able to determine whether the detected person is a family member or someone outside the family, i.e., a suspicious individual, and if suspicious activity is detected, to identify information that can lead to proving the crime.

[0009] The intrusion detection system described in Patent Document 1 determines that an intruder has entered a monitored area when the radio wave strength of a radio signal from an access point measured by a radio signal monitoring device falls below a predetermined radio wave strength threshold as the radio wave strength for detecting the presence of a person who has entered the monitored area, and obtains terminal information specific to the terminal carried by the intruder via the access point. Patent Document 1 can detect the presence or absence of an intruder in the monitored area, but it cannot detect the position or movement of the intruder (or any family member). Furthermore, because it cannot detect the position of a person, if there are multiple people, for example, it cannot identify which terminal each person is carrying, and therefore it cannot identify each person. Furthermore, because it cannot detect the movement of a person, it cannot identify the route of movement of the person.

[0010] The device for human identification based on human wireless biometric information described in Patent Document 2 is excellent in that it can identify humans only from channel state information (CSI) used in wireless LAN sensing. However, the human identification device described in Patent Document 2 requires that human wireless biometric information be acquired in advance based on each person's CSI, and stored in a database in association with a known identity. Therefore, for example, for people other than family members, such as suspicious individuals or visitors, the human wireless biometric information is not stored in the database, making it impossible to identify them. Therefore, for example, in the case of a burglary, it is not possible to prove the crime of an arrested suspect. In addition, at present, it is difficult to identify a person from the correlation between newly acquired CSI and human radio biometric information stored in a database based on each person's CSI, and even if it is possible to identify a person, there are issues such as an increase in circuit size and a lack of accuracy in identifying the person.

[0011] The user identification device described in Patent Document 3 differs from Patent Document 2 in that it acquires identification information related to a PED (personal electric device), but is the same in that it generates a user identification model (equivalent to the human biometric information in Patent Document 2). It is certainly ideal to generate a user identification model and identify people based on channel state information (CSI) and the user identification model, but this is not practical due to issues such as increased circuit size and insufficient person identification accuracy.

[0012] The access point described in Patent Document 4 is characterized in that when it receives an association request signal from a terminal that has received a beacon signal, requesting association with the access point, it transmits the location information of the access point to a location information acquisition device at that stage as the location information of the terminal. However, the location information transmitted is that of the access point, not the terminal itself, so the location information acquisition device does not know where the terminal is located within the communication range of the access point or how it is moving.

[0013] The wireless monitoring system described in Patent Document 5 can monitor the movement of a person relative to a map by acquiring time-series channel information (TSCI) of a wireless multipath channel. However, the person being monitored cannot determine whether the detected movement belongs to a family member or someone outside the family, i.e., a suspicious individual.

[0014] The main object of the present invention is to provide a wireless LAN sensing system that can identify whether a person detected by wireless LAN sensing is a family member or someone outside the family, such as a suspicious person, and a method for identifying a person by wireless LAN sensing. Another object of the present invention is to provide a wireless LAN sensing system with a person identification function that can be easily implemented at low cost by combining wireless LAN access point technology and wireless LAN sensing technology that are already in practical use today, and a method for identifying a person using wireless LAN sensing. [Means for solving the problem]

[0015] (1) A wireless LAN sensing system according to one aspect comprises a wireless LAN sensing device including a transmitter configured to transmit a probe signal, a wireless communication unit that receives the probe signal modulated by a person via a multipath channel, and a wireless LAN sensing unit that detects the position and / or movement of the person by analyzing the received probe signal, and a wireless LAN access point that acquires unique identification information of the wireless communication terminal through wireless communication with the wireless communication terminal, and when the wireless LAN sensing device detects an unidentified person, the system searches for the owner of the wireless communication terminal based on the acquired unique identification information of the wireless communication terminal, and identifies the owner of the wireless communication terminal as the person detected by the wireless LAN sensing device. The unique identification information of the wireless communication terminal is, for example, the MAC address of the wireless communication terminal or the SSID of the wireless LAN access point to which the wireless communication terminal was previously connected.

[0016] Wireless LAN sensing is known, which detects the location and / or movement of a person using a series of probe signals modulated by the person through a multipath channel. However, conventional wireless LAN sensing can detect the location and / or movement of a person, but cannot identify the person. On the other hand, there are prior art documents that show that human wireless biometric information for identifying a person or a user identification model is generated from channel state information (CSI) used in wireless LAN sensing, and when a new person is detected by wireless LAN sensing, the detected person is identified from the correlation between the newly detected person's CSI and human wireless biometric information.However, even if this method can identify the person, it has issues such as the need for advance preparation such as database creation, increased circuit size, and insufficient accuracy in person identification.

[0017] In one aspect of the wireless LAN sensing system, a technology for detecting the position and / or movement of a person using wireless LAN sensing is combined with a technology for acquiring unique identification information of a wireless communication terminal using a wireless LAN access point, and when the wireless LAN sensing device detects an unidentified person (a new person different from a person who has already been identified), the owner of the wireless communication terminal is searched for based on the acquired unique identification information of the wireless communication terminal, and the owner is identified as the person detected by the wireless LAN sensing device. Therefore, in a wireless LAN sensing system according to one aspect, it is possible to realize a wireless LAN sensing system that can identify a person easily and at low cost without prior preparation such as creating a database. In addition, the determination of whether a wireless communication terminal belongs to an unidentified person (new person) may be made, for example, by determining that the wireless communication terminal belongs to an unidentified person when a wireless LAN sensing device and a wireless LAN access point are placed close to each other, the unidentified person is located near the wireless LAN sensing device, and the RSSI of the radio waves from the wireless communication terminal is above a predetermined threshold. In addition, during the initial setup of the wireless LAN sensing system, it is desirable to input a map of the passageways, walls, doors, etc. around the wireless LAN sensing system into the wireless LAN sensing system, and to compare and calibrate the position of a person detected by the wireless LAN sensing device with the actual position of the person, thereby improving the detection accuracy of the wireless LAN sensing device. It is also desirable to define areas on the map where detected people should be detected as family members, visitors, or suspicious people. Furthermore, if a person moves to a location where radio waves cannot reach and is no longer detected by the wireless LAN sensing device, and is then detected again by the wireless LAN sensing device as a person who has not been identified, the owner of the wireless communication terminal can be searched for again based on the acquired unique identification information of the wireless communication terminal, and the owner of the wireless communication terminal can be identified as the person detected by the wireless LAN sensing device.

[0018] (2) In a wireless LAN sensing system according to one aspect of the second invention, the position and / or movement of an identified person may be periodically detected to create a trajectory of movement, and the person on the trajectory may be considered to be the identified person.

[0019] When a person returns home, they may place the smartphone (wireless communication terminal) that they had in their pocket or bag on a table and leave the area.Even in such cases, the position and / or movement of the identified person can be periodically detected to create a movement trajectory, and the person on the trajectory can be identified, allowing the person detected by the wireless LAN sensing device to be continuously tracked.

[0020] (3) A wireless LAN sensing system according to a third aspect of the present invention is a wireless LAN sensing system according to one aspect or the second aspect of the present invention, wherein at least some of the functions of the transmitter and the wireless LAN sensing device including a wireless communication unit and a wireless LAN sensing unit may be included in the wireless LAN access point.

[0021] For example, if a wireless LAN network consists of only one wireless LAN access point and a wireless communication terminal, a wireless LAN sensing system can be constructed by adding a transmitter and giving the wireless LAN access point the functionality of a wireless LAN sensing device. Furthermore, for example, if a wireless LAN network is composed of one wireless LAN access point and one or more wireless LAN access points (or wireless LAN repeaters), a wireless LAN sensing system can be configured without adding a separate transmitter by using the wireless LAN access point (or wireless LAN repeater) as a transmitter and giving the wireless LAN access point the functionality of a wireless LAN sensing device.

[0022] (4) A wireless LAN sensing system according to a fourth invention is a wireless LAN sensing system according to any one of the first to third inventions, in which when the wireless LAN sensing device detects a new unidentified person in addition to a person who has already been identified, and the wireless LAN access point acquires unique identification information that is different from the unique identification information that has already been acquired, the wireless LAN sensing system may search for the owner of the wireless communication terminal based on the newly acquired unique identification information and identify the owner of the wireless communication terminal as the newly detected person.

[0023] Although a wireless sensing device can detect the location of a person, a wireless LAN access point cannot detect the location of a wireless communication terminal if there is only one. Therefore, in general, if two people each have a wireless communication terminal, it is not possible to know which wireless communication terminal belongs to which person. However, for example, if a first person returns home first and then a second person returns home, the first person can be identified from the first person and the unique identification information acquired first. In such a case, it can be assumed that the newly detected person is the owner of the wireless communication terminal that transmitted the newly acquired unique identification information. Therefore, even if two people each have a wireless communication terminal, each person can be identified.

[0024] (5) A wireless LAN sensing system according to a fifth aspect of the present invention is a wireless LAN sensing system according to any one of the first to fourth aspects of the present invention, which includes a plurality of wireless LAN access points, a wireless communication terminal measuring the radio wave strength or arrival time from each of the plurality of wireless LAN access points, a wireless LAN sensing device receiving the radio wave strength or arrival time measured by the wireless communication terminal to estimate the position of the wireless communication terminal, and if there are a plurality of wireless communication terminals, searching for the owner of the wireless communication terminal based on the unique identification information of the wireless communication terminal closest to the person detected by the wireless LAN sensing device, and identifying the owner of the wireless communication terminal as the person detected by the wireless LAN sensing device.

[0025] A wireless LAN sensing system according to one aspect searches for the owner of a wireless communication terminal from the acquired unique identification information of the wireless communication terminal and identifies the owner as the person detected by the wireless LAN sensing device. However, for example, if there are two people and two wireless communication terminals, it may not be clear which wireless communication terminal belongs to which person. A wireless LAN sensing system according to a fifth aspect of the present invention more accurately estimates the location of a wireless communication terminal in order to detect the owner of the wireless communication terminal even in such cases. Specifically, the system is equipped with multiple wireless LAN access points (preferably three or more), acquires the radio wave strength or arrival time from each of the wireless LAN access points measured by the wireless communication terminal, and estimates the location of the wireless communication terminal using the principle of triangulation. If multiple wireless communication terminals exist, the system searches for the owner of the wireless communication terminal based on the unique identification information of the wireless communication terminal closest to the detected person, and identifies the owner of the wireless communication terminal as the person detected by the wireless LAN sensing device. In this case, the wireless communication terminal must be equipped with the function of measuring the radio wave strength or arrival time from each wireless LAN access point and transmitting the results to the wireless LAN sensing device upon request from the wireless LAN sensing device. This function can be easily implemented in a wireless communication terminal such as a family member's smartphone by installing the necessary app. However, if the unspecified person is a suspicious individual, this function is not included in the wireless communication terminal they possess. However, if there is no response regarding the measurement results of the radio wave strength or arrival time in response to a request from the wireless LAN sensing device, this means that the detected person is a suspicious individual or non-family member, or that the person does not possess a wireless communication terminal. For example, if all family members possess wireless communication terminals and have the necessary app installed, the detected person can be determined to be a suspicious individual. Furthermore, the wireless LAN access point can obtain the unique identification information of the wireless communication terminal, which can be used to prove the suspicious individual's crime.

[0026] (6) A wireless LAN sensing system according to a sixth aspect of the present invention is a wireless LAN sensing system according to any one of the first to fourth aspects of the present invention, which includes a plurality of wireless LAN access points, each of which measures radio wave strength or arrival time from a wireless communication terminal, and a wireless LAN sensing device which receives the radio wave strength or arrival time measured by each of the wireless LAN access points to detect the location of the wireless communication terminal, and if there are a plurality of wireless communication terminals, the owner of the wireless communication terminal may be searched for based on the unique identification information of the wireless communication terminal closest to the person detected by the wireless LAN sensing device, and the owner of the wireless communication terminal may be identified as the person detected by the wireless LAN sensing device.

[0027] In the wireless LAN sensing system of the fifth invention, a wireless communication terminal measures the radio wave strength or arrival time from each of multiple wireless LAN access points, whereas in the wireless LAN sensing system of the sixth invention, each of multiple wireless LAN access points measures the radio wave strength or arrival time from the wireless communication terminal, but otherwise is the same as the fifth invention. In the fifth invention, it is necessary to provide the wireless communication terminal with a function for measuring radio wave strength or arrival time and transmitting the measured value to the wireless LAN sensing device, whereas in the sixth invention, the wireless LAN access point has a function for measuring the radio wave strength or arrival time of the wireless communication terminal and transmitting the measured value to the wireless LAN sensing device, eliminating the need to install an app on the wireless communication terminal such as a family member's smartphone. Meanwhile, in the fifth invention, the wireless LAN access point periodically outputs a beacon signal, whereas in the sixth invention, the wireless communication terminal does not necessarily periodically emit radio waves. The choice between the fifth and sixth aspects of the invention should be determined based on the environment of the wireless LAN sensing system, the number of wireless communication terminals that need to be detected, and so on.

[0028] (7) The wireless LAN sensing system of the seventh invention is a wireless LAN sensing system of the fifth or sixth invention, which is equipped with a normal mode in which a person is identified by comparing the person's position with the position of a wireless communication terminal, and a tracking mode in which the position and / or movement of the identified person is periodically detected to create a trajectory of movement and identify the person on the trajectory as the identified person, and the tracking mode is activated when the distance between the identified person and the wireless communication terminal exceeds a predetermined value, and the system may return to the normal mode when the distance between the identified person and the wireless communication terminal falls below the predetermined value.

[0029] The wireless LAN sensing system of the fifth or sixth invention periodically, for example at one-minute intervals, detects the location of a person using a wireless LAN sensing device and estimates the location of a wireless communication terminal by measuring the radio wave strength or arrival time of a wireless LAN access point, and identifies the person by continuously comparing these results. However, for example, if a person returns home and moves to another location, leaving the wireless communication terminal on the table, the distance between the person's position and the wireless communication terminal's position becomes large, and this method may not be able to identify the person. In order to enable the detected person to be continuously identified even in such cases, the wireless LAN sensing system of the seventh invention is equipped with a tracking mode in which, when the distance between the identified person and the wireless communication terminal exceeds a predetermined value, the position and / or movement of the identified person is periodically detected to create a trajectory of their movement, and the person on the trajectory is identified as the identified person. However, when a person who has moved to another location returns and picks up the wireless communication terminal or puts it in his / her pocket, causing the distance between the identified person and the wireless communication terminal to become equal to or less than a predetermined value, the mode returns to the normal mode, which allows the person to be identified more reliably. Furthermore, if the wireless LAN sensing device detects a person who does not carry a wireless communication terminal, and the person has never been identified on the person's trajectory, the person is classified as an unidentified person even in the tracking mode. It is desirable that the cycle for detecting a person's location and estimating the location of the wireless communication terminal be between 5 seconds and 1 minute. This is because a cycle of 10 seconds or less increases the amount of communication time and power used, and a cycle of 3 minutes or more increases the possibility of missing a person's movement. Furthermore, the distance between the identified person and the wireless communication terminal, which is used as the criterion for switching between the normal mode and the tracking mode, is preferably between 50 cm and 2 m. This is because if the specified distance is less than 30 cm, there is a high possibility that the correspondence between the person and the wireless communication terminal will be overlooked, and if it is more than 2 m, there is a high possibility that the movement of the person will be overlooked if the person moves the wireless communication terminal on a table or the like.

[0030] (8) A wireless LAN sensing system according to an eighth aspect of the present invention is the wireless LAN sensing system according to the seventh aspect of the present invention, wherein the cycle of detection by wireless LAN sensing can be made shorter in tracking mode than in normal mode.

[0031] In this case, by shortening the detection cycle using wireless LAN sensing in tracking mode, the risk of losing track of the movement trajectory of a specified person can be reduced even when the radio wave conditions are poor. Furthermore, by varying the detection cycle by wireless LAN sensing between the tracking mode and the normal mode, it is possible to optimize the balance between reducing communication time and power consumption and improving the accuracy of identifying people. However, depending on the radio wave conditions, etc., it may be possible to accurately detect the trajectory of a person's movement even with the same cycle as in normal mode, so it is desirable to be able to choose whether the cycle in tracking mode is the same as in normal mode or shorter than in normal mode.

[0032] (9) A wireless LAN sensing system according to a ninth aspect of the present invention may be a wireless LAN sensing system according to the fifth or sixth aspect of the present invention, in which the multiple wireless LAN access points are a mesh parent router and one or more mesh child repeaters.

[0033] In this case, for example, if the mesh parent router is given the functionality of a wireless LAN sensing device, and the mesh parent router sends an instruction to the mesh child repeater to send a series of probe signals, and the position of the wireless communication terminal is estimated using the principle of triangulation, the wireless communication terminal (in the case of the fifth invention) or the mesh child repeater (in the case of the sixth invention) can be instructed to receive radio wave strength or arrival time and send the data to the mesh parent router, thereby smoothly detecting the position and / or movement of a person and identifying the detected person.

[0034] (10) According to another aspect, a method for identifying a person using a wireless LAN sensing system includes a wireless LAN sensing device including a transmitter configured to transmit probe signals, a wireless communication unit that receives a series of probe signals modulated by the person via a multipath channel, and a wireless LAN sensing unit that detects the position and / or movement of the person by analyzing the received probe signals, and a wireless LAN access point that acquires unique identification information of the wireless communication terminal through wireless communication with the wireless communication terminal.When the wireless LAN sensing device detects an unidentified person, the method searches for the owner of the wireless communication terminal based on the acquired unique identification information of the wireless communication terminal, and identifies the owner of the wireless communication terminal as the person detected by the wireless LAN sensing device.

[0035] A method for identifying a person using a wireless LAN sensing system according to another aspect is a method invention corresponding to the wireless LAN sensing system according to the one aspect. In another aspect, a method for identifying a person using a wireless LAN sensing system combines a technology for detecting the position and / or movement of a person using wireless LAN sensing with a technology for acquiring unique identification information of a wireless communication terminal using a wireless LAN access point, and when the wireless LAN sensing device detects an unidentified person, the owner of the wireless communication terminal is searched for from the acquired unique identification information of the wireless communication terminal, and the owner is identified as the person detected by the wireless LAN sensing device. Therefore, in the method for identifying a person by a wireless LAN sensing system according to another aspect, it is possible to realize a wireless LAN sensing system that can identify a person easily and at low cost. In addition, the determination of whether a wireless communication terminal belongs to an unidentified person may be made, for example, by placing a wireless LAN sensing device and a wireless LAN access point in close proximity, and determining that the wireless communication terminal belongs to an unidentified person if the unidentified person is located near the wireless LAN sensing device and the RSSI of the radio waves from the wireless communication terminal is above a predetermined threshold. [Brief explanation of the drawings]

[0036] [Figure 1] FIG. 1 is a schematic explanatory diagram showing the configuration of a wireless LAN sensing system according to a first embodiment. [Figure 2] FIG. 2 is a schematic block diagram showing the configuration of a transmitter. [Figure 3] FIG. 1 is a schematic block diagram showing the configuration of a wireless LAN sensing device. [Figure 4] FIG. 1 is a schematic block diagram showing the configuration of a wireless LAN access point. [Figure 5] FIG. 1 is a schematic block diagram showing the configuration of a wireless LAN access point having the functions of a wireless LAN sensing device. [Figure 6] 10 is a flowchart showing an example of a flow for identifying a person according to the first embodiment. [Figure 7] FIG. 10 is a schematic explanatory diagram of a method for measuring the position of a wireless communication terminal by a wireless LAN access point in the second embodiment. [Figure 8] FIG. 10 is a schematic explanatory diagram showing the configuration of a wireless LAN sensing device according to a second embodiment. [Figure 9] 10 is a flowchart showing an example of a flow for identifying a person according to the second embodiment. [Figure 10] 10 is a flowchart showing an example of a flow of switching between a normal mode and a follow-up mode in the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0037] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following description, the same components are designated by the same reference numerals. Furthermore, when the reference numerals are the same, the names and functions of the components are also the same. Therefore, detailed descriptions thereof will not be repeated.

[0038] [First embodiment] FIG. 1 is a schematic explanatory diagram showing the configuration of a wireless LAN sensing system 100 of the first embodiment, FIG. 2 is a schematic block diagram showing the configuration of a transmitter 10, FIG. 3 is a schematic block diagram showing the configuration of a wireless LAN sensing device 20, FIG. 4 is a schematic block diagram showing the configuration of a wireless LAN access point 30, and FIG. 5 is a schematic block diagram showing the configuration of a wireless LAN access point 30a having the functions of the wireless LAN sensing device 20. FIG. 6 is a schematic flowchart showing an example of a flow in which the wireless LAN sensing system 100 of the first embodiment identifies the person 50. 1, a wireless LAN sensing system 100 includes a transmitter 10, a wireless LAN sensing device 20, and a wireless LAN access point 30. If the wireless LAN access point 30 is a wireless LAN access point 30a that has the functions of the wireless LAN sensing device 20, the wireless LAN sensing device 20 may be omitted. 1 also shows a wireless communication terminal 40 and a person 50 carrying the wireless communication terminal 40. The wireless communication terminal 40 is, for example, a smartphone equipped with a wireless LAN function. The wireless communication terminal 40 also includes a personal computer equipped with a wireless LAN function that is always available regardless of the person 50.

[0039] The wireless LAN sensing system 100 is installed, for example, in a user's home. In the wireless LAN sensing system 100, the wireless LAN sensing device 20 periodically instructs the transmitter 10 to transmit a series of probe signals, and the transmitter 10 transmits the series of probe signals. Furthermore, the wireless LAN sensing device 20 receives the series of probe signals modulated by the person 50 via a multipath channel, extracts and analyzes channel state information (CSI), and detects the position and / or movement of the person 50. Furthermore, the wireless LAN access point 30 periodically transmits a beacon, and when it receives an authentication request from the wireless communication terminal 40 that has received the beacon, it acquires and stores the unique identification information of the wireless communication terminal 40. The unique identification information of the wireless communication terminal 40 is, for example, the MAC address of the LAN interface of the wireless communication terminal 40 or an SSID (Service Set Identifier) ​​that the wireless communication terminal 40 has previously connected to and stored. When a person 50 carrying a wireless communication terminal 40 enters a location where the wireless LAN sensing system 100 is installed, the wireless LAN sensing device 20 detects the presence and position of the person 50. Upon detecting the presence of the person 50, the wireless LAN sensing device 20 requests the unique identification information of the wireless communication terminal 40 from the wireless LAN access point 30, and the wireless LAN access point 30 transmits the stored unique identification information of the wireless communication terminal 40. In this case, it is desirable that the wireless LAN access point 30 also transmits the time when it acquired the unique identification information of the wireless communication terminal 40 to the wireless LAN sensing device 20. The wireless LAN sensing device 20 receives the unique identification information of the wireless communication terminal 40, and if multiple wireless communication terminals 40 have received the unique identification information, selects the wireless communication terminal 40 that most recently obtained the unique identification information, thereby selecting the unique identification information of the wireless communication terminal 40 that corresponds to the person 50. By setting the wireless communication terminal 40 that most recently obtained the identification information as the wireless communication terminal 40 carried by the person 50, it is possible to identify the wireless communication terminal 40 carried by the person 50 even if a personal computer with a wireless LAN function is placed in the room. In this case, if a predetermined time (for example, 60 seconds) passes between the time the person 50 is detected and the time the unique identification information is obtained, it is possible to prevent the two from being identified.

[0040] Next, if the selected wireless communication terminal 40 is a wireless communication terminal 40 that has been registered in advance, such as a wireless communication terminal 40 of the user's family, the wireless LAN sensing device 20 identifies the person 50 based on the registration. Furthermore, if the corresponding wireless communication terminal 40 has not been registered in advance, the person 50 may be judged as a suspicious person and contacted with a specific contact point. Furthermore, if the person 50 whose position has been detected moves, the wireless LAN sensing device 20 can create a trajectory of that movement. Therefore, for example, even if the person 50 returns home and moves the wireless communication terminal 40 on the table, the current position of the person 50 can be detected.

[0041] 2 is a schematic block diagram showing the configuration of transmitter 10. Transmitter 10 includes wireless communication unit 11, control unit 12, and antenna 13. Transmitter 10 has the function of wirelessly communicating with wireless LAN sensing device 20 directly or via wireless LAN access point 30, and the function of transmitting a probe signal required for wireless LAN sensing. Furthermore, when control unit 12 receives an instruction to transmit a probe signal from wireless LAN sensing device 20, it transmits the probe signal from wireless communication unit 11.

[0042] 3 is a schematic block diagram showing the configuration of the wireless LAN sensing device 20. The wireless LAN sensing device 20 includes a wireless communication unit 21, a control unit 22, an antenna 23, a wireless LAN sensing unit 24, and a person identification unit 25. Note that at least a portion of the control unit 22, the wireless LAN sensing unit 24, and the person identification unit 25 may be configured to operate as a program using a CPU and memory provided in the wireless LAN sensing device 20. The wireless communication unit 21 has a function of wirelessly communicating with the transmitter 10 directly or via the wireless LAN access point 30, a function of communicating with the wireless LAN access point 30, and a function of receiving a probe signal transmitted by the transmitter 10. The wireless LAN sensing unit 24 extracts and analyzes channel state information (CSI) from the probe signal received by the wireless communication unit 21, and detects the presence, position and / or movement of a person 50, etc. Furthermore, in the initial setup of the wireless LAN sensing system 100, it is desirable to input a map of the passageways, walls, doors, etc. around the wireless LAN sensing system 100 into the wireless LAN sensing system 100, and to compare and calibrate the position of the person detected by the wireless LAN sensing device 20 with the actual position of the person, thereby improving the detection accuracy of the wireless LAN sensing device 20. It is also desirable to define an area on the map within which the detected person 50 should be detected as a family member, visitor, or suspicious person.

[0043] When the wireless LAN sensing unit 24 detects a person 50, the person identification unit 25 requests the wireless LAN access point 30 for the acquired unique identification information of the wireless communication terminal 40, and when the unique identification information of the wireless communication terminal 40 is received, the person identification unit 25 searches for the owner of the wireless communication terminal 40 from the unique identification information and identifies the owner of the wireless communication terminal 40 as the detected person 50. In this case, if multiple wireless communication terminals 40 have received unique identification information, it is desirable to identify the owner of the wireless communication terminal 40 whose unique identification information was most recently acquired as the detected person 50. In addition, if the selected wireless communication terminal 40 has not been registered in advance, the person identification unit 25 may determine that the person 50 is a suspicious person and contact a specific contact point (for example, a user with administrative authority or a security company). Furthermore, when the person identification unit 25 finds a suspicious person, it may activate a tracking mode (described later) to track the suspicious person's movements in detail and record the suspicious person's actions in a log. This allows the suspicious person's actions to be identified later in the event that they commit a crime, thereby obtaining information that can lead to proving the crime. The wireless LAN sensing device 20 may also be provided with a speaker and / or a warning light as an alarm unit, and when the person identification unit 25 determines that a suspicious person has entered the premises, the alarm unit may issue a warning to the suspicious person and people nearby. Furthermore, if there is a security device (for example, a device provided by a security company) in the user's home, the wireless LAN sensing device 20 may cooperate with the security device to deal with the intrusion of a suspicious person. Even when a person 50 having an unregistered wireless communication terminal 40 is detected, if a person 50 having a registered wireless communication terminal 40 is in close proximity, the person 50 may be determined not to be a suspicious person (for example, a friend of the user). This makes it possible to prevent false alarms. Furthermore, even when a person 50 having an unregistered wireless communication terminal 40 is detected, if the user operates the no-alert button on his or her own wireless communication terminal 40, the person 50 may not be determined to be a suspicious person (for example, a friend of the user). In this case, the unique identification information of the wireless communication terminal 40 that is determined not to be a suspicious person may be automatically added to the safe list. This prevents a person 50 on the safe list from being mistakenly determined to be a suspicious person, thereby preferably preventing false alarms.

[0044] 4 is a schematic block diagram showing the configuration of a wireless LAN access point 30. The wireless LAN access point 30 includes a wireless communication unit 31, a control unit 32, an antenna 33, and a network communication unit 34. The wireless communication unit 31 communicates wirelessly with a wireless communication terminal 40, a transmitter 10, and a wireless LAN sensing device 20. The network communication unit 34 communicates with other wired communication terminals and the Internet via a router (not shown). The wireless LAN access point 30 may also be configured as a home gateway further including a wired communication unit, a router, an optical line termination circuit, etc. The control unit 32 periodically transmits beacons, and when an authentication request is received from the wireless communication terminal 40, the control unit 32 transmits an authentication response to the wireless communication terminal 40, and also acquires and stores the unique identification information of the wireless communication terminal 40 included in the authentication request. Furthermore, when a probe request is received from the wireless communication terminal 40, the control unit 32 transmits a probe response, and also acquires and stores the unique identification information of the wireless communication terminal 40 included in the probe request. Furthermore, when the wireless LAN sensing device 20 requests the unique identification information of the wireless communication terminal 40, the stored unique identification information is transmitted to the wireless LAN sensing device 20. In this case, it is desirable to also transmit the time when the unique identification information of each wireless communication terminal 40 was acquired. At least a part of the control unit 32 and the network communication unit 34 may be operated as a program using a CPU and memory provided in the wireless LAN access point 30 .

[0045] 5 is a schematic block diagram showing the configuration of a wireless LAN access point 30a having the functions of the wireless LAN sensing device 20. The wireless LAN access point 30a has a wireless communication unit 31a, a control unit 32a, an antenna 33, a wireless LAN sensing unit 24, a person identification unit 25, and a network communication unit 34. Of these, the wireless communication unit 31a has the functions of both the wireless communication unit 21 of the wireless LAN sensing device 20 and the wireless communication unit 31 of the wireless LAN access point 30. Similarly, the control unit 32a has the functions of both the control unit 22 of the wireless LAN sensing device 20 and the control unit 32 of the wireless LAN access point 30. Meanwhile, the wireless LAN sensing unit 24 and the person identification unit 25 have the same functions as the wireless LAN sensing unit 24 and the person identification unit 25 of the wireless LAN sensing device 20. Furthermore, the network communication unit 34 has the same functions as the network communication unit 34 of the wireless LAN access point 30. Like the wireless LAN access point 30, the wireless LAN access point 30a may also be configured as a home gateway. At least some of the control unit 32a, the wireless LAN sensing unit 24, the person identification unit 25, and the network communication unit 34 may be operated as a program using a CPU and memory provided in the wireless LAN access point 30a.

[0046] (Flowchart for identifying a person using the wireless LAN sensing system 100) FIG. 6 shows an example of a flowchart for identifying a person using the wireless LAN sensing system 100. 6, each step is described in a separate column so that it is easy to understand the processing of the wireless LAN sensing device 20, the processing of the transmitter 10, the processing of the wireless LAN access point 30, and the processing of the wireless communication terminal 40. The processing content for each step will be explained below. (Step S1) The wireless LAN sensing device 20 instructs the transmitter 10 to transmit a probe signal. (Steps S2, S3) When the transmitter 10 receives a transmission instruction from the wireless LAN sensing device 20, it transmits a probe signal for wireless LAN sensing. (Steps S4, S5) When the wireless LAN sensing device 20 receives the probe signal, it extracts channel state information (CSI) from the probe signal and, by comparing it with previous CSI, detects whether a person 50 is present in the target area, where they are, and in what direction they are moving. (Steps S6 and S7) When the wireless LAN sensing device 20 detects the person 50, the wireless LAN sensing device 20 requests the wireless LAN access point 30 to transmit the unique identification information of the wireless communication terminal 40.

[0047] (Step S8) The wireless LAN access point 30 periodically transmits a beacon. (Steps S9 and S13) Upon receiving the beacon, the wireless communication terminal 40 transmits an authentication request to the wireless LAN access point 30. (Steps S9 and S10) If the wireless communication terminal 40 fails to receive a beacon for a certain period of time, the wireless communication terminal 40 transmits a probe request to the SSID to which the wireless communication terminal 40 wishes to connect. (Steps S11 and S12) When the wireless LAN access point 30 receives a probe request for its own SSID, it transmits a probe response. (Steps S13 and S14) When the wireless communication terminal 40 receives the probe response, it transmits an authentication request to the wireless LAN access point 30. (Steps S15 and S16) When the wireless LAN access point 30 receives an authentication request, it acquires and stores the unique identification information of the wireless communication terminal 40 that sent the authentication request. When the wireless LAN access point 30 does not receive an authentication request, it waits until it receives another probe request or authentication request. (Steps S17 and S18) When wireless LAN access point 30 is requested by wireless LAN sensing device 20 to transmit the unique identification information of wireless communication terminal 40, it transmits the unique identification information to wireless LAN sensing device 20. In this case, it is desirable to also transmit the time at which each unique identification information was acquired to wireless LAN sensing device 20 at the same time. (Steps S19 and S20) When the wireless LAN sensing device 20 receives the unique identification information of the wireless communication terminal 40, it searches for the owner of the wireless communication terminal 40 from the unique identification information.

[0048] In this case, the wireless LAN sensing device 20 normally receives the unique identification information of multiple wireless communication terminals 40. However, since the wireless communication terminals 40 carried by the person 50 to be identified entered an area detectable by the wireless LAN sensing device 20 together with the person 50, if the time at which the unique identification information of each wireless communication terminal 40 was acquired is known, it is easy to determine which wireless communication terminal 40 is carried by the person 50 to be identified. Furthermore, even if there are multiple persons 50 in an area detectable by the wireless LAN sensing device 20, the persons 50 can be matched with the wireless communication terminals 40 carried by the persons 50 by matching the time at which the persons 50 were detected with the time at which the unique identification information was acquired. For example, if the wireless LAN sensing device 20 detects a new unidentified person 50 in addition to a person 50 that has already been identified, and the wireless LAN access point 30 acquires new unique identification information that is different from the unique identification information that has already been acquired, the owner of the wireless communication terminal 40 may be searched for from the newly acquired unique identification information and identified as the newly detected person 50. (Step S21) In this manner, the detected person 50 is matched with the wireless communication terminal 40 carried by the person 50, and the owner of the wireless communication terminal 40 carried by the person 50 is identified as the person 50 detected by the wireless LAN sensing device 20. If the corresponding wireless communication terminal 40 has not been registered in advance, the person 50 may be judged as a suspicious person and contacted with a specific contact point. Furthermore, when person 50 returns home, he or she may place the smartphone (wireless communication terminal 40) that was in his or her pocket or bag on a table and leave the place. Even in such a case, the position and / or movement of identified person 50 is periodically detected by wireless LAN sensing device 20 to create a trajectory of movement, and person 50 on the trajectory is regarded as identified person 50, thereby making it possible to continuously identify person 50 detected by wireless LAN sensing device 20.

[0049] [Second embodiment] The wireless LAN sensing system 100 of the first embodiment has one wireless LAN access point 30, and the wireless LAN sensing system 100 can only acquire the unique identification information of the wireless communication terminal 40 and cannot estimate the position of the wireless communication terminal 40. However, the wireless LAN sensing system 100a of the second embodiment has three wireless LAN access points 30a, 30b, and 30c, and is different in that the wireless LAN sensing device 20a estimates the position of the wireless communication terminal 40 using the radio wave intensity or arrival time of the beacons received by the wireless communication terminal 40 from the wireless LAN access points 30a, 30b, and 30c. Fig. 7 is a schematic explanatory diagram of a method for measuring the position of a wireless communication terminal 40 by wireless LAN access points 30a, 30b, and 30c in the second embodiment. Fig. 8 is a schematic block diagram showing the configuration of a wireless LAN sensing device 20a in the second embodiment. The wireless LAN sensing device 20a is configured by adding a wireless communication terminal position estimation unit 26 to the wireless LAN sensing device 20. In the wireless LAN sensing system 100a, one of the wireless LAN access points 30a, 30b, and 30c can be given the functions of the transmitter 10, and the other can be given the functions of the wireless LAN sensing device 20a, so that the wireless LAN sensing system 100a can be configured with only the three wireless LAN access points 30a, 30b, and 30c, as shown in Figure 7.

[0050] 7, wireless LAN access points 30a, 30b, and 30c each transmit a beacon, and wireless communication terminal 40 measures the radio wave strength or arrival time of the beacon from wireless LAN access points 30a, 30b, and 30c. Then, wireless communication terminal 40 transmits the radio wave strength or arrival time of the beacon to wireless LAN sensing device 20a. Since the strength of radio waves is inversely proportional to the square of the distance from the antenna and the arrival time is proportional to the distance from the antenna, the wireless communication terminal position estimation unit 26 of the wireless LAN sensing device 20a can estimate the position of the wireless communication terminal 40 based on the positions of the wireless LAN access points 30a, 30b, and 30c and the principle of triangulation. It should be noted that when there are two wireless LAN access points 30a, 30b, it is not possible to estimate the position of the wireless communication terminal 40 using the principle of triangulation. However, wireless LAN access points 30 and wireless communication terminals 40 for Wi-Fi 5 (802.11ac) and later are equipped with a function called "beamforming," and the direction of the wireless LAN access point 30 can be estimated by using "beamforming." Therefore, by using wireless LAN access points 30a, 30b and wireless communication terminals 40 for Wi-Fi 5 and later, it is possible to estimate the position of the wireless communication terminal 40 even when there are two wireless LAN access points 30a, 30b. Also, although three wireless LAN access points 30a, 30b, and 30c are arranged in FIG. 7, the wireless LAN sensing system 100a can also be configured with a mesh master router and one or more mesh slave repeaters.

[0051] (Flowchart for identifying a person using the wireless LAN sensing system 100a) FIG. 9 shows an example of a flowchart for identifying a person by the wireless LAN sensing system 100 of the second embodiment. 9, the processing of the wireless LAN sensing device 20a, the processing of the transmitter 10, the processing of the wireless LAN access point 30, and the processing of the wireless communication terminal 40 are shown in separate columns so that they can be understood. Note that the functions of the wireless LAN sensing device 20a and the transmitter 10 can be combined with any of the wireless LAN access points 30a, 30b, and 30c. In addition, in the flowchart of Figure 9, steps whose processing content is the same as that in the flowchart of Figure 6 are given the same step numbers, steps whose processing content is similar to that in the flowchart of Figure 6 but slightly different have an "a" added to the end of the step number, and steps whose processing content is newly added are given step numbers SSn (n is an integer).

[0052] The processing content for each step will be explained below. (Steps S1-S6) These are steps for detecting the presence, position and / or movement of person 50 by wireless LAN sensing, and the processing content is the same as that in the first embodiment (FIG. 6). (Step S7a) This is the same as in Figure 6 in that information about the corresponding wireless communication terminal 40 is requested from the wireless LAN access point 30 in order to identify the detected person 50, but while in the first embodiment the unique identification information of the wireless communication terminal 40 and the time the unique identification information was acquired are requested, in the second embodiment the radio wave strength (or arrival time) of multiple wireless LAN access points 30a, 30b, 30c acquired by the wireless communication terminal 40 is also requested. (Steps S8-S16) The wireless communication terminal 40 receives a beacon from the wireless LAN access points 30a, 30b, and 30c, or transmits a probe request to one of the wireless LAN access points 30a, 30b, and 30c, receives a probe response, transmits an authentication request, and one of the wireless LAN access points 30a, 30b, and 30c acquires the unique identification information of the wireless communication terminal 40. However, the second embodiment differs from the first embodiment in that a step (step SS1) is added in which the wireless communication terminal 40 measures and stores the radio wave intensity of each beacon when receiving a beacon from the wireless LAN access points 30a, 30b, and 30c.

[0053] (Steps SS2-SS5) In the second embodiment, when any of the wireless LAN access points 30a, 30b, and 30c receives an authentication request, it sends an authentication response and establishes a connection with the wireless communication terminal 40, and then any of the wireless LAN access points 30a, 30b, and 30c receives the radio wave strength (or arrival time) measured by the wireless communication terminal 40. (Steps S17a-S19a) Any of the wireless LAN access points 30a, 30b, and 30c that has established a connection with the wireless communication terminal 40 transmits the unique identification information of the wireless communication terminal 40 and the radio wave strength (or arrival time) of the beacon of the wireless LAN access point 30a, 30b, and 30c measured by the wireless communication terminal 40 to the wireless LAN sensing device 20a, and the wireless LAN sensing device 20a receives the unique identification information and the radio wave strength (or arrival time). (Step SS6) The wireless LAN sensing device 20a estimates the position of the wireless communication terminal 40 based on the principle of triangulation using the positions and radio wave intensity (or arrival time) of the wireless LAN access points 30a, 30b, and 30c. (Step SS7) If there are multiple wireless communication terminals 40 in the target area of ​​the wireless LAN sensing system 100, the wireless LAN sensing device 20a selects the wireless communication terminal 40 closest to the detected person 50 and sets it as the wireless communication terminal 40 carried by the person 50. (Steps S20-S21) The owner of the selected wireless communication terminal 40 is searched for from the unique identification information of the wireless communication terminal 40, and the owner of this wireless communication terminal 40 is identified as the person 50 detected by the wireless LAN sensing device 20a.

[0054] In the second embodiment, the wireless communication terminal 40 needs to measure the radio wave intensity of the beacons of the wireless LAN access points 30a, 30b, and 30c and transmit the measured signal to the wireless LAN sensing device 20a. If the wireless communication terminal 40 is, for example, a smartphone owned by a family member, this can be easily achieved by installing a dedicated app on the smartphone. However, if the person carrying the wireless communication terminal 40 is a visitor or a suspicious person, the location of the wireless communication terminal 40 cannot be estimated. However, if the visitor and his / her family are in the target area of ​​the wireless LAN sensing system 100, it is possible to identify the visitor by identifying the family. Furthermore, if only the visitor is in the target area, it is possible to identify the visitor as a suspicious person.

[0055] (Modification of the second embodiment) In the second embodiment, the wireless communication terminal 40 measures the radio wave intensity of the beacons of the wireless LAN access points 30a, 30b, and 30c. However, even if the wireless LAN access points 30a, 30b, and 30c measure the radio wave intensity of the wireless communication terminal 40, it is possible to estimate the location of the wireless communication terminal 40 using the principle of triangulation. In this case, there is no need to install a dedicated app on the wireless communication terminal 40, and therefore the location of the wireless communication terminal 40 carried by a visitor or suspicious person can also be estimated. However, since the wireless communication terminal 40 does not periodically transmit beacons with constant radio wave strength like the wireless LAN access points 30a, 30b, and 30c, the wireless LAN access points 30a, 30b, and 30c must simultaneously capture appropriate transmitted radio waves such as probe requests from the wireless communication terminal 40.

[0056] (Added follow mode) The wireless LAN sensing system 100a of the second embodiment detects the position of a person 50 using a wireless LAN sensing device 20 and estimates the position of a wireless communication terminal 40 by measuring the radio wave intensity of wireless LAN access points 30a, 30b, and 30c periodically, for example at one-minute intervals, and identifies the person 50 by continuously comparing these results. However, for example, if a person 50 returns home and moves to another location, leaving the wireless communication terminal 40 on the table, the distance between the position of the person 50 and the position of the wireless communication terminal 40 becomes large, and this method cannot identify the person 50. Therefore, the wireless LAN sensing system 100a of the second embodiment has a normal mode in which the person 50 is identified by comparing the position of the person 50 with the position of the wireless communication terminal 40, and a tracking mode in which a trajectory of the movement of the identified person 50 is created by wireless LAN sensing and the person 50 on the trajectory is identified as the identified person 50. In the tracking mode, in order to improve the accuracy of tracking by wireless LAN sensing, it is desirable to make the period for detecting the position of person 50 by wireless LAN sensing device 20 shorter than that in normal mode. In this case, when the distance from wireless communication terminal 40 used to identify person 50 falls below a predetermined value, the mode is returned to normal mode and the detection period is also restored. It is desirable that the cycle for detecting the position of the person 50 and estimating the position of the wireless communication terminal 40 be between 5 seconds and 1 minute. This is because a cycle of 5 seconds or less increases the amount of communication time and power used, and a cycle of 1 minute or more increases the possibility that the movement of the person 50 will be overlooked. Furthermore, the distance between the identified person 50 and the wireless communication terminal 40, which is used as a criterion for switching between the normal mode and the tracking mode, is preferably 50 cm or more and 2 m or less. This is because if the predetermined distance is less than 50 cm, there is a high possibility that the correspondence between the person 50 and the wireless communication terminal 40 will be overlooked, and if it is more than 2 m, there is a high possibility that the movement of the person 50 will be overlooked when the person 50 moves the wireless communication terminal 40 on a table or the like.

[0057] FIG. 10 is a flowchart showing an example of a flow of switching between the normal mode and the follow-up mode in the second embodiment. The processing content for each step will be explained below. (Steps S31, S32) The wireless LAN sensing system 100a detects a person 50 who has entered a target area using the wireless LAN sensing device 20a, and estimates the position of the wireless communication terminal 40 using the wireless LAN access points 30a, 30b, and 30c. (Steps S33, S34, S35) The distance between the detected person 50 and the estimated wireless communication terminal 40 is calculated, and if the distance is equal to or less than a predetermined value L, the owner of the wireless communication terminal 40 is identified as the detected person 50. Thereafter, the process waits until a predetermined time T1 has elapsed, and once T1 has elapsed, the process returns to step S31. (Steps S33, S36) If the distance between the detected person 50 and the estimated wireless communication terminal 40 exceeds L, the trajectory of the movement of the person 50 is created by superimposing the previous positions of the person 50 detected by the wireless LAN sensing device 20a. (Steps S37, S38, S39) If the person 50 has previously been identified somewhere on the trajectory of the person 50's movement, the person 50 on the trajectory is regarded as a previously identified person 50, and if the person 50 has never been identified, the person 50 is regarded as an unidentified person. For example, if the person 50 does not have a wireless communication terminal 40 and enters the target area, the person 50 is classified as an unidentified person. (Step S40) Wait until a predetermined time T2 has elapsed, and when T2 has elapsed, return to step S31. In this case, it is preferable to set T2 shorter than T1. This is because, in tracking mode, it is desirable to set T2 shorter in order to more accurately grasp the movement trajectory of person 50, whereas in normal mode, the movement trajectory is not important, and it is desirable to set T1 longer from the viewpoint of reducing communication time and power consumption. However, depending on the radio wave conditions, etc., it may be possible to accurately detect the movement trajectory of a person in tracking mode at the same cycle as in normal mode, in which case T2 may be set to the same value as T1. Furthermore, it is preferable that the ratio of T1 to T2, T1 / T2, be 5 or less. This is because if T1 / T2 is greater than 5, switching from normal mode to tracking mode will be delayed.

[0058] In the present invention, transmitter 10 corresponds to a "transmitter," wireless communication unit 21 corresponds to a "wireless communication unit," wireless LAN sensing unit 24 corresponds to a "wireless LAN sensing unit," wireless LAN sensing devices 20, 20a correspond to "wireless LAN sensing devices," wireless communication terminal 40 corresponds to a "wireless communication terminal," wireless LAN access points 30, 30a, 30b, 30c correspond to "wireless LAN access points," person 50 corresponds to a "person," and wireless LAN sensing system 100, 100a corresponds to a "wireless LAN sensing system."

[0059] Although a preferred embodiment of the present invention has been described above, the present invention is not limited thereto. It will be understood that various other embodiments can be made without departing from the spirit and scope of the present invention. Furthermore, although the actions and effects of the configuration of the present invention are described in this embodiment, these actions and effects are merely examples and do not limit the present invention. [Explanation of symbols]

[0060] 10 Transmitter 11. Wireless Communication Section 20, 20a Wireless LAN sensing device 24 Wireless LAN sensing unit 30, 30a, 30b, 30c Wireless LAN access point 40 Wireless communication terminal 50 people 100, 100a Wireless LAN Sensing System

Claims

1. a transmitter configured to transmit a probe signal; a wireless LAN sensing device including a wireless communication unit that receives the probe signal modulated by a person via a multipath channel, and a wireless LAN sensing unit that detects the position and / or movement of the person by analyzing the received probe signal; a wireless LAN access point that acquires unique identification information of a wireless communication terminal through wireless communication with the wireless communication terminal; A wireless LAN sensing system in which, when the wireless LAN sensing device detects an unidentified person, the owner of the wireless communication terminal is searched for based on the acquired unique identification information of the wireless communication terminal, and the owner of the wireless communication terminal is identified as the person detected by the wireless LAN sensing device.

2. 2. The wireless LAN sensing system according to claim 1, wherein the position and / or movement of the identified person is periodically detected to create a trajectory of the person's movement, and the person on the trajectory is regarded as the identified person.

3. 2. The wireless LAN sensing system according to claim 1, wherein at least some of the functions of the transmitter and the wireless LAN sensing device including the wireless communication unit and the wireless LAN sensing unit are included in the wireless LAN access point.

4. 2. The wireless LAN sensing system of claim 1, wherein when the wireless LAN sensing device detects a new unidentified person in addition to a person already identified, and the wireless LAN access point acquires unique identification information that is different from the unique identification information already acquired, the wireless LAN sensing device searches for the owner of the wireless communication terminal based on the newly acquired unique identification information and identifies the owner of the wireless communication terminal as the newly detected person.

5. A plurality of the wireless LAN access points are provided, the wireless communication terminal measures the radio wave intensity or the arrival time from each of the plurality of wireless LAN access points; the wireless LAN sensing device receives the radio wave intensity or the arrival time measured by the wireless communication terminal and estimates the position of the wireless communication terminal; 2. The wireless LAN sensing system of claim 1, wherein, when there are multiple wireless communication terminals, the owner of the wireless communication terminal is searched for based on the unique identification information of the wireless communication terminal closest to the person detected by the wireless LAN sensing device, and the owner of the wireless communication terminal is identified as the person detected by the wireless LAN sensing device.

6. A plurality of the wireless LAN access points are provided, Each of the plurality of wireless LAN access points measures the radio wave intensity or the arrival time from the wireless communication terminal; the wireless LAN sensing device receives the radio wave intensity or the arrival time measured by each of the wireless LAN access points to detect the position of the wireless communication terminal; 2. The wireless LAN sensing system of claim 1, wherein, when there are multiple wireless communication terminals, the owner of the wireless communication terminal is searched for based on the unique identification information of the wireless communication terminal closest to the person detected by the wireless LAN sensing device, and the owner of the wireless communication terminal is identified as the person detected by the wireless LAN sensing device.

7. a normal mode in which a person is identified by comparing the position of the person with the position of the wireless communication terminal, and a tracking mode in which the position and / or movement of the identified person is periodically detected to create a trajectory of movement, and the person on the trajectory is identified as the identified person; When the distance between the identified person and the wireless communication terminal exceeds a predetermined value, the following mode is activated; 7. The wireless LAN sensing system according to claim 5, wherein the system returns to the normal mode when the distance between the identified person and the wireless communication terminal becomes equal to or less than a predetermined value.

8. 8. The wireless LAN sensing system according to claim 7, wherein the cycle of detection by the wireless LAN sensing can be made shorter in the tracking mode than in the normal mode.

9. 7. The wireless LAN sensing system according to claim 5, wherein the plurality of wireless LAN access points are a mesh master router and one or more mesh slave repeaters.

10. a transmitter configured to transmit a probe signal; a wireless LAN sensing device including a wireless communication unit that receives the probe signal modulated by a person via a multipath channel, and a wireless LAN sensing unit that detects the position and / or movement of the person by analyzing the received probe signal; a wireless LAN access point that acquires unique identification information of a wireless communication terminal through wireless communication with the wireless communication terminal, A method for identifying a person, in which when the wireless LAN sensing device detects an unidentified person, the owner of the wireless communication terminal is searched for based on the acquired unique identification information of the wireless communication terminal, and the owner of the wireless communication terminal is identified as the person detected by the wireless LAN sensing device.

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