JP2016017793A - Wireless positioning device, wireless positioning method, wireless positioning system, and computer program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To receive communication data transmitted from a wireless terminal from a communication data processing device, and estimate the distance between the communication data processing device and the wireless terminal on the basis of the received communication data.SOLUTION: A wireless positioning device comprises: a characteristic information generation unit for generating first terminal characteristic information that is the by-type information of a wireless terminal on the basis of one or more pieces of communication data transmitted by the wireless terminal to a communication data processing device via a wireless communication line and the strength of a radio wave when the communication data is received by the communication data processing device; and a type determination unit for determining the type of the wireless terminal by comparing the first terminal characteristic information generated by characteristic information generation means with second terminal characteristic information predetermined for each type of the wireless terminal.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a wireless positioning device and the like that can estimate the distance between a wireless communication terminal and a communication data processing device that receives communication data (packets) transmitted from the wireless communication terminal. In particular, the present invention relates to a wireless positioning device or the like that can determine a model of a wireless communication terminal based on received communication data and output an estimation result of the distance obtained by performing correction processing for each model.

  In recent years, wireless communication terminals (smartphones, mobile phones, etc.) carried by users using communication data processing devices such as packet capture devices for the purpose of distributing appropriate information to users moving in facilities Technologies for distributing various types of information to portable information terminals and the like have been proposed.

  In such a technique, for example, a communication data processing device receives communication data (packets) transmitted from a wireless communication terminal carried by a user. Then, the distance between the communication data processing device and the wireless communication terminal according to the strength of the communication radio wave received by the communication data processing device from the wireless communication terminal (hereinafter sometimes referred to as “radio wave strength”). And appropriate information is distributed based on the estimation result.

  The following patent documents are disclosed in relation to such a technique.

  Patent Document 1 discloses a technique related to an information distribution system for a mobile phone. In the system disclosed in Patent Literature 1, the detection device transmits the electric field strength when the communication frame is received from the mobile phone to the server device, and the server device selects based on the electric field strength received from the detection device. Send the distribution data to the mobile phone.

  Patent Document 2 discloses a technology related to information distribution to a mobile terminal. The technique disclosed in Patent Literature 2 controls various information distribution paths for a mobile terminal based on radio wave intensity of wireless communication between the mobile terminal and a wireless LAN access point and a detection time of communication data.

  In the techniques described in Patent Literature 1 and Patent Literature 2, a device corresponding to a packet capture device receives a packet transmitted from a user's mobile terminal, detects the presence of the terminal, and determines the radio field intensity and packet detection time. The information distribution method is controlled based on conditions determined from the length.

  Patent Document 3 discloses a technique for calculating a position estimation range for two specific portable devices based on the signal strength of radio waves received by the other portable devices from two specific portable devices. In the technique disclosed in Patent Document 3, when the position estimation ranges calculated for a plurality of other portable devices are equal to each other, the two specific form terminals are within the same range. It is recognized that it exists.

  Patent Document 4 discloses a technique capable of changing distribution content for each area where a communication terminal exists. The technique disclosed in Patent Document 4 estimates the arrangement area of each terminal based on the radio wave intensity of wireless communication received from each portable terminal. And the technique disclosed by patent document 4 distributes the content corresponding to every estimated arrangement area.

  Patent Document 5 discloses a technique for identifying a wireless LAN terminal having an adjacent physical arrangement when performing direct wireless communication between a plurality of wireless LAN terminals. According to the technique disclosed in Patent Document 5, each wireless LAN terminal performs a site survey, so that the radio field strength and the identification information (network information) of the wireless LAN terminal are determined for each of the other wireless LAN terminals present in the vicinity. To collect. Each wireless LAN terminal calculates the similarity of the radio wave intensity in the network information by transmitting and receiving network information collected by each terminal to each other, and based on the calculated similarity, A wireless LAN terminal is extracted.

  Patent Document 6 discloses a technique for detecting a portable wireless communication device such as a cellular phone. The technology disclosed in Patent Document 6 transmits a plurality of pseudo area signals for a mobile terminal in a plurality of frequency bands, and receives response radio waves transmitted from the mobile terminal in response to the pseudo area signals. The technique disclosed in Patent Document 6 identifies the type of mobile terminal based on the frequency of the response radio wave.

International Publication No. 2012/098802 Japanese Patent No. 5175401 JP 2012-194721 A JP 2012-16084A JP 2007-306217 A JP 2000-049695 A

  The technologies disclosed in Patent Documents 1 to 5 described above are based on, for example, the radio wave intensity of a wireless communication terminal (such as a portable terminal), between wireless communication terminals, and between wireless communication terminals and a communication data processing device. Estimate the distance to (packet capture device, access point, etc.).

  However, there are various types of wireless communication terminals, and the radio wave output power differs depending on the model when the wireless communication terminal is separated from the wireless communication terminal by a specific distance. For this reason, there is a problem that an error occurs when the distance is estimated from the radio wave intensity. In addition, since the accuracy of distance estimation is reduced due to such an error, there are cases where the communication terminal can determine only two states of “present” or “not present” near each packet capture device.

  The present invention has been made in view of the above circumstances. That is, the present invention determines the model of the wireless communication terminal based on communication data (packet) transmitted from the wireless communication terminal, and receives the communication data based on the radio wave intensity corrected using the determination result. It is a main object to provide a wireless positioning device or the like that can estimate the distance between the device and the wireless terminal.

  In order to achieve the above object, a wireless positioning apparatus according to one aspect of the present invention includes the following arrangement. That is, a wireless positioning device according to one embodiment of the present invention includes one or more pieces of communication data transmitted from a wireless terminal to a communication data processing device via a wireless communication line, and the communication data in the communication data processing device. Characteristic information generating means for generating first terminal characteristic information which is information of the type of the wireless terminal based on the radio field intensity at the time of reception, and the first terminal generated by the characteristic information generating means Model discriminating means for discriminating the model of the wireless terminal by comparing the characteristic information with second terminal characteristic information predetermined for each model of the wireless terminal;

  In addition, the wireless positioning device according to one aspect of the present invention includes radio wave intensity when the communication data processing device receives model information indicating the model of the radio terminal and communication data transmitted by the radio terminal via a radio communication line. And normalizing means for normalizing the radio wave intensity using a normalization constant predetermined for each model of the wireless terminal, and the radio wave intensity normalized by the normalizing means, the communication data Distance conversion means for converting to a distance between the processing device and the wireless terminal.

  A wireless positioning method according to one aspect of the present invention includes the following configuration. That is, in the wireless positioning method according to one aspect of the present invention, the information processing device transmits one or more pieces of communication data transmitted from the wireless terminal to the communication data processing device via the wireless communication line, and the communication data processing device. The first terminal characteristic information, which is the type-specific information of the wireless terminal, is generated based on the radio field intensity when the communication data is received in the communication data, the generated first terminal characteristic information, The model of the wireless terminal is determined by comparing with second terminal characteristic information predetermined for each model of the wireless terminal.

  The object is also achieved by a computer program for realizing the wireless positioning device having the above-described configuration and the corresponding wireless positioning method by a computer, and a computer-readable storage medium storing the computer program. Achieved.

  According to the present invention, the communication data (packet) transmitted from the wireless communication terminal is received, the model of the wireless communication terminal is determined based on the communication data, and the radio wave intensity corrected using the determination result is used. A wireless positioning device or the like that can estimate the distance between the device that has received the communication data and the wireless terminal is provided.

FIG. 1 is a diagram illustrating a configuration of a wireless positioning system in the first embodiment of the present invention. FIG. 2 is a block diagram illustrating a functional configuration of the terminal distance estimation apparatus in the first embodiment of the present invention. FIG. 3 is a flowchart illustrating the operation of the terminal distance estimation apparatus in the first embodiment of the invention. FIG. 4 is an explanatory diagram illustrating a specific example of packet information acquired from the wireless terminal according to the first embodiment of this invention. FIG. 5 is a diagram showing a specific example of the radio wave intensity pattern in the first embodiment of the present invention. FIG. 6 is a diagram showing another specific example of the radio wave intensity pattern in the first embodiment of the present invention. FIG. 7 is a diagram illustrating a specific example of information held in the model information storage unit in the terminal distance estimation apparatus according to the first embodiment of the present invention. FIG. 8 is a diagram illustrating a specific example of information held in the normalized constant storage unit in the terminal distance estimation apparatus according to the first embodiment of the present invention. FIG. 9 is a block diagram illustrating a functional configuration of the terminal distance estimation apparatus according to the second embodiment of the present invention. FIG. 10 is a block diagram illustrating a functional configuration of a terminal distance estimation apparatus according to the third embodiment of the present invention. FIG. 11 is a block diagram illustrating a hardware configuration of an information processing apparatus capable of realizing each component of the wireless positioning device according to each embodiment of the present invention.

  Next, embodiments of the present invention will be described in detail with reference to the drawings. The configurations described in the following embodiments are merely examples, and the technical scope of the present invention is not limited thereto.

<First Embodiment>
Hereinafter, a wireless positioning system 100 according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram illustrating a configuration of a wireless positioning system 100 according to the first embodiment of the present invention. FIG. 2 is a block diagram illustrating a functional configuration of the terminal distance estimation apparatus 103 according to the first embodiment of the present invention.

  As illustrated in FIG. 1, the wireless positioning system 100 in the present embodiment includes a packet capture device 102, a terminal distance estimation device 103, and an output device 104. These components are communicably connected via an arbitrary wireless or wired connection and a communication line combining them. Since the communication network may adopt a well-known technique, detailed description in this embodiment is omitted.

  A mobile terminal (wireless terminal) 101 is communicably connected to the wireless positioning system 100 via a wireless communication line.

  The wireless terminal 101 is, for example, a portable terminal having a wireless communication function based on a wireless LAN (Local Area Network) complying with the IEEE (The Institute of Electrical and Engineering Engineers) 802.11 standard. The wireless terminal 101 may be any information communication device such as a smartphone, a tablet terminal, a mobile phone, a game machine, or a personal computer. Note that the wireless terminal 101 may have a wireless communication function corresponding to an arbitrary wireless communication method other than the wireless LAN. As such a wireless communication method, for example, Bluetooth (registered trademark) may be employed. Hereinafter, in the present embodiment, for convenience of explanation, it is assumed that the wireless terminal 101 and the wireless positioning system 100 in the present embodiment are connected by a wireless LAN corresponding to the above standard.

  Note that the wireless terminal 101 may be carried by a mobile object. The type of mobile object that carries the wireless terminal 101 is not particularly limited, and may be a human being, an animal, a robot, a car, or some object. In addition, the mobile object that carries the wireless terminal 101 may move freely within and outside the detection range of the packet capture device 102.

  Hereinafter, each component of the wireless positioning system 100 in this embodiment will be described.

  The packet capture device 102 is a communication data processing device that receives communication data (hereinafter sometimes referred to as “packet”) transmitted from the wireless terminal 101. When a packet is received, the packet capture device 102 acquires the reception time of the packet, information that can identify the wireless terminal 101 that transmitted the packet, and the radio wave intensity when the packet is received.

  The information that can identify the wireless terminal 101 may be, for example, a MAC (Media Access Control) address of the wireless terminal 101.

  The packet capture device 102 notifies the terminal distance estimation device 103 of the acquired packet reception time, MAC address, and radio wave intensity. In this case, the packet capture device 102 may transmit these data to the terminal distance estimation device 103 via an arbitrary communication line.

  Note that the MAC address notified to the terminal distance estimation apparatus 103 may be information that can uniquely identify the wireless terminal 101. For this reason, the packet capture device 102 may transmit information obtained by encrypting the MAC address or information obtained by replacing the MAC address with a unique character string registered in advance to the terminal distance estimation device 3.

  When the MAC address is encrypted, the same encrypted data is generated if the MAC address is always encrypted by the same method. That is, the same encrypted data is permanently used for the wireless terminal 101, and as a result, the location of the wireless terminal 101 may be tracked. From the viewpoint of protecting privacy information, the packet capture device 102 may change the encryption method and encryption key so that the encrypted data obtained by encrypting the MAC address changes according to time and place. In the following, for convenience of explanation, a case where the MAC address is used without being encrypted will be described as an example.

  Next, the terminal distance estimation apparatus 103 will be described with reference to FIG. As illustrated in FIG. 2, the terminal distance estimation apparatus 103 includes a characteristic information generation unit 201, a model determination unit 202, a radio wave intensity normalization unit 203, and a distance conversion unit 204. The terminal distance estimation apparatus 103 also includes a model information storage unit 205 and a normalized constant storage unit 206. In this embodiment, these components are communicably connected by an arbitrary communication bus, a communication network, or the like.

  First, an outline of each component constituting the terminal distance estimation apparatus 103 will be described.

  The characteristic information generation unit 201 acquires the packet reception time, the MAC address, and the radio wave intensity from the packet capture device 102, and generates terminal characteristic information (packet transmission frequency, radio wave intensity pattern, etc.) described later. The packet transmission frequency and the radio wave intensity pattern will be described later.

  The model information storage unit 205 stores (holds) terminal characteristic information such as a packet transmission frequency and a radio wave intensity pattern for each specific model of the wireless terminal 101 acquired in advance by an experiment or the like. Here, the model information storage unit 205 may store at least a part or all of the MAC address for each specific model of the wireless terminal 101.

  The model determination unit 202 compares the terminal characteristic information generated by the characteristic information generation unit 201 with the terminal characteristic information stored in the model-specific information storage unit 205, and determines the model of the wireless terminal 101 based on the result. Determine.

  The normalization constant storage unit 206 stores a constant for normalizing the radio wave intensity for each model of the wireless terminal 101.

  The radio wave intensity normalization unit 203 uses the model information of the wireless terminal 101 determined by the model determination unit 202 to extract a normalization constant related to the wireless terminal 101 from the normalization constant storage unit 206, and relates to the wireless terminal 101. Normalize the signal strength.

  The distance conversion unit 204 converts the radio wave intensity normalized by the radio wave intensity normalization unit 203 into a distance between the packet capture device 102 and the wireless terminal 101.

  Hereinafter, each of the above components will be described more specifically.

  First, the characteristic information generation unit 201 will be described. The characteristic information generation unit 201 acquires, as input information, the packet reception time, MAC address, radio wave intensity, and the like related to a certain wireless terminal 101 acquired by the packet capture device 102. Hereinafter, the set of these three pieces of information may be referred to as packet information. Note that the wireless terminal 101 that has transmitted a packet that is the source of the packet information may be referred to as a transmission source wireless terminal 101.

  The characteristic information generation unit 201 generates terminal characteristic information from packet information obtained in a predetermined period for the same MAC address (that is, the same wireless terminal 101). The terminal characteristic information is information on a specific model of the wireless terminal 101 (hereinafter also referred to as “terminal model”). Such terminal characteristic information is generated for each transmission source terminal 101. Such terminal characteristic information may be information specific to each model of the wireless terminal 101. Note that the terminal characteristic information generated by the characteristic information generation unit 201 may be referred to as first terminal characteristic information.

  The terminal characteristic information generated in the characteristic information generation unit 201 may include, for example, a packet transmission frequency described later, a radio wave intensity pattern, and the like.

  The packet transmission frequency represents the transmission frequency of specific communication data (packets) having a specific transmission pattern for each model of the transmission source wireless terminal 101. In the present embodiment, as an example, the specific communication data is a probe request (“ProbeRequest” signal) in the wireless LAN, as will be described later. The specific communication data is not limited to the above, and may be arbitrary communication data having a transmission pattern unique to each model of the transmission source terminal 101.

  For example, the characteristic information generation unit 201 may calculate an average or variance (or standard deviation) of packet reception time intervals as the packet transmission frequency. The packet reception time interval in this embodiment is, for example, the reception time interval at which the packet capture device 102 receives one or more packets from the transmission source wireless terminal 101. For example, the characteristic information generation unit 201 can calculate the packet reception time interval by measuring the interval of packet reception times (reception times) included in a plurality of packet information. In other words, the characteristic information generation unit 201 may calculate the packet transmission frequency based on a statistic regarding the interval of packet reception time.

  Alternatively, for example, the characteristic information generation unit 201 may calculate an average or variance (or standard deviation) of packet reception frequencies as the packet transmission frequency. The packet reception frequency in this embodiment and others is, for example, the number of times that the packet capture device 102 has received one or more packets from the transmission source wireless terminal 101. For example, the characteristic information generation unit 201 can calculate the frequency of packet reception by counting the number of times a packet is received based on the packet information acquired in a certain period. In other words, the characteristic information generation unit 201 may calculate the packet transmission frequency based on a statistic regarding the packet reception frequency.

  The radio wave intensity pattern in the present embodiment is information generated based on information about each packet when one or more packets are received from a certain wireless terminal 101, for example. Note that the information related to the packet may include, for example, the radio wave intensity when the packet is received.

  The wireless terminal 101 transmits a probe request (“ProbeRequest”) packet while switching a wireless LAN communication channel (hereinafter simply referred to as “channel”) used by the wireless terminal 101.

  The characteristic information generation unit 201 uses, for example, this probe request to calculate the attenuation rate of the radio field intensity in the adjacent channel and the number of packet transmissions to each channel, and based on these calculation results, A pattern may be generated.

  The characteristic information generation unit 201 in the present embodiment only needs to be able to acquire terminal characteristic information that can identify the terminal model from the input information (packet information). For this reason, the terminal characteristic information is not limited to the specific example described above. Further, the characteristic information generation unit 201 may acquire a plurality of types of terminal characteristic information as many as necessary for specifying the terminal model.

  In the following, it is assumed that the characteristic information generation unit 201 uses at least one of a packet transmission frequency and a radio wave intensity pattern as the terminal characteristic information.

  The characteristic information generation unit 201 notifies the model identification unit 202 of the MAC address and the generated terminal characteristic information (first terminal characteristic information). Further, the characteristic information generation unit 201 notifies the radio wave intensity normalization unit 203 of the value of the radio wave intensity included in the packet information.

  Next, the model discrimination unit 202 will be described. The model determination unit 202 determines the model of the transmission source wireless terminal 101 from the MAC address notified from the characteristic information generation unit 201 and the terminal characteristic information. That is, the model determination unit 202 determines the terminal model of the wireless terminal 101 that is the transmission source of the packet information acquired by the characteristic information generation unit 201.

  Generally, the first 24 bits of the MAC address are a vendor ID (Identifier) part, and the vendor of the terminal can be determined from the MAC address. For this reason, the model discrimination unit 202 discriminates the vendor using the MAC address notified from the characteristic information generation unit 201.

  The model determination unit 202 acquires terminal characteristic information set for each model provided by the determined vendor from the model information storage unit 205 described later. Note that the terminal characteristic information acquired from the model information storage unit 205 may be referred to as second terminal characteristic information. The second terminal characteristic information is information that represents unique characteristics for each terminal model. The second terminal characteristic information may include, for example, at least one of a packet transmission frequency set in advance for each model provided by the determined vendor and a radio wave intensity pattern.

  The model determination unit 202 compares the terminal characteristic information (first terminal characteristic information) notified from the characteristic information generation unit 201 with the second terminal characteristic information for each terminal model acquired from the model information storage unit 205. To do. In this case, the model determination unit 202 includes information included in the terminal characteristic information notified from the characteristic information generation unit 201 and information included in the second terminal characteristic information for each terminal model acquired from the model information storage unit 205. May be compared.

  More specifically, the model determination unit 202 includes at least one of the packet transmission frequency and the radio wave intensity pattern notified from the characteristic information generation unit 201 and at least one of the packet transmission frequency and the radio wave intensity pattern acquired from the model information storage unit 205. One may be compared with each other.

  The model discriminating unit 202 discriminates the terminal model having the transmission frequency and the radio wave intensity pattern most similar to the transmission frequency and the radio wave intensity pattern in the first terminal characteristic information notified from the characteristic information generating unit 201 as a result of the comparison. . The model discriminating unit 202 notifies the radio wave intensity normalizing unit 203 of a model ID that is information that can identify the discriminated model.

  The radio wave intensity normalization unit 203 searches the normalization constant storage unit 206 for a model ID that matches the model ID input from the model determination unit 202. In this case, the radio wave intensity normalization unit 203 may request the normalization constant storage unit 206 to acquire a model ID that matches the model ID input from the model determination unit 202.

  The radio wave intensity normalization unit 203 acquires, from the normalization constant storage unit 206, a radio wave intensity normalization constant associated with the model ID that matches the model ID input from the model determination unit 202. The radio wave intensity normalization unit 203 normalizes the radio wave intensity input from the characteristic information generation unit 201 using the acquired radio wave intensity normalization constant.

  Then, the radio wave intensity normalization unit 203 notifies the distance conversion unit 204 of the normalized radio wave intensity.

  The distance conversion unit 204 calculates the distance between the transmission source wireless terminal 101 and the packet capture device 102 using the normalized radio wave intensity notified from the radio wave intensity normalization unit 203. That is, the distance conversion unit 204 converts the normalized radio field intensity into a distance between the transmission source wireless terminal 101 and the packet capture device 102. A specific calculation method for converting the radio wave intensity into the distance will be described later.

  The model information storage unit 205 obtains (obtains) the terminal characteristics including the packet transmission frequency and the radio wave intensity pattern regarding each terminal model, which are obtained (obtained) based on data collected in advance using a plurality of wireless terminals 101 having different terminal models. Information (second terminal characteristic information) is held (stored). Specifically, the model information storage unit 205 may store information configured as a set of {model ID, packet transmission frequency, radio wave intensity pattern} for each terminal model. Note that the model information storage unit 205 may store at least one of a packet transmission frequency and a radio wave intensity pattern.

  More specifically, the model information storage unit 205 is unique to each model configured by a vendor ID, a model ID, a packet transmission frequency, a radio wave intensity attenuation rate, and the number of packet transmissions, for example, as illustrated in FIG. Information representing the characteristics of the terminal may be held as the second terminal characteristic information. Here, the vendor ID is identification information that can specify a vendor related to the wireless terminal 101 (for example, a vendor that provides the wireless terminal 101). Note that the format illustrated in FIG. 7 is an example, and the model information storage unit 205 may hold various types of information illustrated in FIG. 7 in other formats.

  In the present embodiment, based on data collected in advance by a preliminary experiment using a plurality of wireless terminals 101 of different terminal models, terminal characteristic information including the packet transmission frequency and the radio wave intensity pattern of each terminal model (second Terminal characteristic information) may be obtained. Then, terminal characteristic information including the packet transmission frequency and the radio wave intensity pattern of each terminal model may be stored in the model information storage unit 205.

  The normalization constant storage unit 206 stores a radio wave intensity normalization constant for each terminal model obtained from data collected in advance using a plurality of wireless terminals 101 having different terminal models. Specifically, the normalization constant storage unit 206 may store (hold) information including a set of {model ID, normalization constant} for each model. More specifically, the normalization constant storage unit 206 may hold information including a model ID and a normalization constant in a format as illustrated in FIG. The format illustrated in FIG. 8 is an example, and the normalization constant storage unit 206 may store the model ID and the normalization constant in association with each other in another format.

  Next, the output device 104 will be described. The output device 104 is a device that executes an arbitrary application such as a location information service using the distance information output from the terminal distance estimation device 103 and outputs an arbitrary processing result.

  In the present embodiment, the packet capture device 102 and the terminal distance estimation device 103 may be realized as the same device or may be realized as individual devices. Further, the packet capture device 102, the terminal distance estimation device 103, and the output device 104 may be realized as the same device or may be realized as individual devices. As described above, when any one of the packet capture device 102, the terminal distance estimation device 103, and the output device 104 is realized as an individual device, between the individual devices, wired or wireless and a combination thereof are used. The communication network may be communicably connected.

  Next, the operation of the terminal distance estimation apparatus 103 in the wireless positioning system 100 according to the present embodiment configured as described above will be described with reference to the flowchart illustrated in FIG.

  The characteristic information generation unit 201 acquires packet information including the packet reception time, the MAC address, and the radio wave intensity from the packet capture device 102 (step S301). The obtained packet information is, for example, information composed of time, MAC address, and radio wave intensity as shown in FIG.

  Next, the characteristic information generation unit 201 generates first terminal characteristic information including the packet transmission frequency and the radio wave intensity pattern from the packet information acquired in step S301 (step S302).

  As described above, the characteristic information generation unit 201 calculates the average and variance (or standard deviation) of reception time intervals related to the same MAC address among packet information for a certain past time as the packet transmission frequency. May be. Alternatively, the characteristic information generation unit 201 may calculate the average and variance (or standard deviation) of reception frequencies related to the same MAC address among packet information for a certain past time as the packet transmission frequency.

  As described above, the characteristic information generation unit 201 calculates at least one of the attenuation rate of the radio wave intensity in the adjacent channel and the number of packet transmissions to each channel as the radio wave intensity pattern. Hereinafter, the generation of the radio field intensity pattern will be described.

  FIG. 5 is a graph obtained by plotting the radio wave intensity in FIG. 4 in time series. The vertical axis represents the radio wave intensity, and the horizontal axis represents the order in which packets are received from the transmission source wireless terminal 101.

  As described above, the wireless terminal 101 transmits a packet (“ProbeRequest”) while switching the communication channel. For example, in a wireless LAN, a channel is set for each frequency band. In adjacent channels, part of the frequency band of each channel overlaps. For this reason, for example, when the transmission source wireless terminal 101 transmits a packet to a channel adjacent to the communication channel (standby channel) waiting in the packet capture device 102, the packet capture device 102 is in a state where the radio wave intensity is attenuated. , Such a packet is received. That is, when the wireless terminal 101 transmits a packet to a specific communication channel (standby channel) and when the packet is transmitted to another communication channel adjacent to the specific communication channel, the packet capture device 102 receives each packet. The radio wave intensity when receiving is different.

  Therefore, as illustrated in FIG. 5, the radio wave intensity of the packet transmitted to the communication channel waiting in the packet capture device 102 is high, and the radio wave intensity increases as the communication channel becomes farther from the standby channel in the packet capture device 102. Gradually decays. The characteristic information generation unit 201 in the present embodiment may use the attenuation rate of the radio wave intensity in the adjacent channel as the radio wave intensity pattern. The radio wave intensity attenuation rate may be, for example, a change in radio wave intensity (in time series) when the packet capture device 102 sequentially receives packets transmitted to adjacent channels.

  In the specific example shown in FIG. 5, packet transmission is performed once for each communication channel. The characteristic information generation unit 201 in this embodiment may use the number of packet transmissions to each channel as a radio wave intensity pattern. The characteristic information generation unit 201 may count the number of packet transmissions for each communication channel based on the radio wave intensity when the packet capture device 102 receives the packet. In this case, for example, when the packet capture device 102 sequentially acquires packets when the characteristic information generation unit 201 observes radio wave intensities having similar values, the packets are transmitted to the same channel. You may decide that

  Note that the present invention is not limited to the above, and the characteristic information generation unit 201 may count the number of packet transmissions for each communication channel by other methods using the packet information notified from the packet capture device 102.

  FIG. 6 is a graph showing a specific example of the packet reception order and the radio wave intensity in each communication channel, acquired using a wireless terminal 101 of a model different from that in FIG. Comparing FIG. 5 and FIG. 6, it can be seen that there is a difference in the attenuation rate of the radio wave intensity in the adjacent channel and the number of packet transmissions to each channel depending on the terminal model. For example, in the specific example illustrated in FIG. 6, the transmission source wireless terminal 101 transmits a packet twice for each channel. Thus, since the first terminal characteristic information is information unique to each terminal model, the terminal model can be determined using the first terminal characteristic information.

  The characteristic information generation unit 201 may notify the model identification unit 202 of the MAC address and the generated first terminal characteristic information.

  Next, the model identification unit 202 acquires terminal vendor information from the MAC address acquired in step S301 (step S303). The MAC address may be notified from the characteristic information generation unit 201.

  In the specific example shown in FIG. 4, the model discriminating unit 202 determines the wireless terminal from the first 24 bits (that is, “aa: bb: cc” of “aa: bb: cc: dd: ee: ff”). It is also possible to determine the vendor related to 101 and acquire the vendor ID. As the vendor ID, the first 24-bit character string of the MAC address may be used as it is, or may be replaced with an arbitrary character string or the like.

  Next, the model discriminating unit 202 is based on the result of comparing the first terminal characteristic information generated in step S302 with the second terminal characteristic information held (stored) in the model information storage unit 205. Thus, the model of the transmission source wireless terminal 101 is determined.

  More specifically, the model discriminating unit 202 sets the packet transmission frequency and the radio wave for each model of the vendor that matches the vendor ID acquired in step S303 among the information held (stored) in the model information storage unit 205. Get strength pattern. In this case, the model determination unit 202 may acquire at least one of the packet transmission frequency and the radio wave intensity pattern.

  Then, the model identification unit 202 compares the packet transmission frequency and radio wave intensity pattern acquired from the model information storage unit 205 with the packet transmission frequency and radio wave intensity pattern included in the first terminal characteristic information generated in step S302. . In this case, the model discriminating unit 202 includes at least one of the packet transmission frequency and the radio wave intensity pattern acquired from the model information storage unit 205, and the packet transmission frequency and the radio wave intensity pattern included in the first terminal characteristic information generated in step S302. You may compare with at least one of these.

  Based on the comparison result, the model discriminating unit 202 obtains the model ID associated with the packet transmission frequency and the radio wave intensity pattern most similar to the packet transmission frequency and the radio wave intensity pattern included in the first terminal characteristic information. Obtained from the information stored in the information storage unit 205 (step S304). That is, the model determination unit 202 includes at least one of the packet transmission frequency and the radio wave intensity pattern acquired from the model information storage unit 205 and the packet transmission frequency and the radio wave intensity pattern included in the first terminal characteristic information generated in step S302. Based on at least one, the model of the transmission source wireless terminal 101 is determined.

  More specifically, the model information storage unit 205 includes features unique to each model including, for example, the vendor ID, model ID, packet transmission frequency, radio wave intensity attenuation rate, and packet transmission frequency exemplified in FIG. Information (second terminal characteristic information) is stored (stored).

  In step S304, the model discriminating unit 202 selects (extracts) a model ID that matches the vendor ID acquired in step S303 from the various types of information illustrated in FIG. 7, and uses these as model discrimination processing targets. Note that the values of the terminal characteristic information such as the packet transmission frequency, the radio wave intensity attenuation rate, and the number of packet transmissions shown in FIG. 7 are examples, and are not limited thereto. The model information storage unit 205 is not limited to the specific example shown in FIG. 7, and may hold arbitrary information suitable for various processes (calculations) performed to specify the terminal model.

  The model discriminating unit 202 includes terminal characteristic information (first terminal characteristic information) such as the packet transmission frequency and radio wave intensity pattern acquired in step S302, and terminal characteristic information of each model stored in the model information storage unit 205 ( The model of the transmission source wireless terminal 101 may be determined based on the similarity obtained by simply comparing the second terminal characteristic information) with the one-to-one comparison. In this case, for example, the model determination unit 202 compares the data included in the first terminal characteristic information and the second terminal characteristic information individually, thereby comparing the first terminal characteristic information and the first terminal characteristic information. The degree of similarity between the two pieces of terminal characteristic information may be calculated. Further, for example, the model determination unit 202 regards the first terminal characteristic information and the second terminal characteristic information as multi-dimensional feature amounts, and based on the distance measured between the feature amounts, The degree of similarity between the first terminal characteristic information and the second terminal characteristic information may be calculated. Without being limited to the above, the model determination unit 202 may calculate the similarity by comparing the first terminal characteristic information and the second terminal characteristic information by any known method.

  Further, the model discrimination unit 202 may determine the model of the transmission source wireless terminal 101 using an identifier constructed by previously learning terminal characteristic information such as packet transmission frequency and radio wave intensity pattern of each model. Good. Specifically, the model discriminating unit 202 may determine the model of the transmission source wireless terminal 101 using a discriminator applicable to a multi-class classification problem using SVM (Support Vector Machine), a neural network, or the like.

  For example, the classifier uses a packet transmission frequency and a radio wave intensity pattern for each terminal model obtained based on data collected in advance using a plurality of wireless terminals 101 of different terminal models as learning data. It may be constructed by executing a machine learning process.

  The wireless positioning system 100 according to the present embodiment is not limited to the specific example described above, and may employ other known identification devices. Since the configuration of the discriminator itself and the data classification (identification) method using the discriminator may adopt a well-known technique, detailed description is omitted.

  In addition, the information regarding the constructed discriminator may be held by, for example, the model discrimination unit 202 or the model information storage unit 205.

  In addition, in step S <b> 304, the model determination unit 202 may use the lower 24 bits of the MAC address for model determination regarding the transmission source wireless terminal 101. Vendor companies assign unique values and numbers to the lower bits of the MAC address. Vendor companies generally assign the lower 24 bits of such a MAC address with regularity such as a model ID part and a serial ID part.

  Therefore, the model determination unit 202 limits terminal model candidates based on the low-order 24 bits of the MAC address using information on the MAC address stored in advance or the result of determining the model of the wireless terminal 101 in the past. Or a probability value representing the certainty of each terminal model may be calculated. Note that the information regarding the MAC address may be held by the model determination unit 202 or the model information storage unit 205.

  For example, when the model determination unit 202 calculates the probability value, the result of determining the model using the terminal characteristic information acquired in step S202 and the terminal characteristic information held by the model information storage unit 205, and the MAC address By integrating the probability values calculated from the lower 24 bits, a model discrimination result with reliability may be output.

  Next, the radio wave intensity normalization unit 203 calculates the normalization constant associated with the model ID that matches the model ID determined by the model determination unit 202 among the model IDs stored in the normalization constant storage unit 206. Obtain (step S305). For example, as illustrated in FIG. 8, the normalization constant storage unit 206 holds information including a model ID and a normalization constant pair. For example, when the model ID determined by the model determination unit 202 is “type1”, the radio wave intensity normalization unit 203 acquires the normalization constant “3.74” associated with the model ID that matches the model ID. To do.

  Next, the radio wave intensity normalization unit 203 normalizes the radio wave intensity acquired in step S301 using the normalization constant acquired in step S305 (step S306).

  Here, how to obtain the normalization constant stored in the model-specific normalization constant storage unit 206 will be described. The model-specific normalization constant storage unit 206 stores normalization constants obtained in advance for each terminal model by the method described below.

When the power transmitted by the wireless terminal 101 is P, the normalization constant for normalizing the difference in power for each terminal model is k, and the distance between the wireless terminal 1 and the packet capture device 2 is r, the radio field intensity is dB (decibel). The value A is represented by the following formula.

Because the attenuation rate of radio field strength due to distance is common regardless of the terminal model,

Then, α is a normalization constant determined for each terminal model.

  This normalization constant α can be calculated by the following method. That is, the radio wave intensity is measured in advance for all terminal models to be determined by the model determining unit 202, and the average radio wave intensity of all terminal models is calculated using the measured radio wave intensity. The α is calculated as a difference between the calculated average radio wave intensity as a reference value and the reference value calculated for each terminal model.

  When normalizing the radio wave intensity, the normalization constant α for each terminal model obtained by the above-described method may be added to the dB value of the radio wave intensity acquired in step S301.

  Hereinafter, a method for obtaining the normalization constant α for each terminal model will be described using a specific example when the terminal model of the wireless terminal 101 is three types as an example.

First, using one or more wireless terminals 101 for each of three types of terminal models, the radio wave intensity of communication radio waves transmitted from the wireless terminals is measured a plurality of times. When the three types of terminal models are, for example, “type 1”, “type 2”, and “type 3”, the radio wave intensity measured in advance can be expressed as follows. In the formulas exemplified below, n represents the number of observation results (n observations). That is, the radio field intensity is measured n times for three types of terminal models “type 1”, “type 2”, and “type 3”.

Next, the average of all the above-mentioned radio field intensities for the dB value is calculated and used as the reference value A _base . Next, for each of the three terminal models, the average value of the radio field intensity for the dB value is calculated.

Next, the difference between the reference value A _base and the average value of the radio field intensity of each model with respect to the dB value is calculated.

  In the above description, the case where the number of terminal models is three has been described. However, for any type of terminal model, the normalization constant can be calculated by the same method as described above.

  The normalization constant storage unit 206 holds normalization constants for all terminal models calculated as described above.

  Next, the distance conversion unit 204 calculates the distance between the transmission source wireless terminal 101 and the packet capture device 102 using the radio wave intensity normalized in step S206 (step S307).

  The relational expression between the radio wave intensity and the distance is as shown in the above formula (1). Therefore, the distance conversion unit 204 can calculate the distance between the wireless terminal 101 and the packet capture device 102 by solving the above equation (1) for the distance r.

  As described above, in the wireless positioning system 100 according to the present embodiment, the terminal distance estimation apparatus 103 is based on terminal characteristic information (second terminal characteristic information) acquired in advance, a packet received from the wireless terminal 101, and the like. The terminal model of the wireless terminal 101 is determined based on the result of comparison with the terminal characteristic information (first terminal characteristic information) generated in this way. The terminal distance estimation apparatus 103 can reduce errors caused by differences in terminal models by normalizing the radio wave intensity of communication radio waves received from the wireless terminal 101 according to the determined terminal model. Thereby, the terminal distance estimation apparatus 103 can estimate the distance between the wireless terminal 101 and the packet capture apparatus 102 with a small error.

  As described above, according to the wireless positioning system 100 in the present embodiment, the terminal distance estimation apparatus 103 determines the model of the wireless communication terminal 101 based on the communication data (packet) transmitted from the wireless communication terminal 101, and It is possible to estimate the distance between the wireless terminal 101 and the packet capture device 102 that has received the communication data based on the radio field intensity corrected using the determination result.

<Modification of First Embodiment>
Next, a modification of the first embodiment described above will be described. In the following description, a duplicate description of the same configuration as that of the first embodiment described above is omitted.

  In the first embodiment described above, the terminal distance estimation apparatus 103 normalizes the radio field intensity related to the packet transmitted from the wireless terminal 101.

  The wireless positioning system in this modification includes each component (characteristic information generation unit 201, model determination unit 202, radio wave intensity normalization unit 203, distance conversion unit 204, model information storage unit of the terminal distance estimation apparatus 103 described above. 205 and the normalization constant storage unit 206) may be divided and arranged in a plurality of devices, and the same function as the terminal distance estimation device 103 may be realized by combining the plurality of devices.

  In this case, for example, the wireless positioning system according to the present modification realizes the functions of the respective components using an information processing device, and combines the information processing devices, thereby the terminal distance estimation device according to the first embodiment described above. A system capable of demonstrating 103 functions may be constructed.

  In addition, the wireless positioning system in the present modification may realize the function of the terminal distance estimation apparatus 103 using an apparatus that can realize a function that combines the components of the terminal distance estimation apparatus 103.

  Specifically, the wireless positioning system in the present modification includes, for example, a model information determination device including a characteristic information generation unit 201, a model determination unit 202, and a model information storage unit 205, and a radio wave intensity normalization unit 203. Further, a system capable of demonstrating the function of the terminal distance estimation device 103 may be constructed by combining a distance conversion device including the normalized constant storage unit 206 and the distance conversion unit 204.

  In this case, the model information determination device may notify the distance conversion device of the determination result of the terminal model for the wireless terminal 101. Then, the distance conversion device calculates the normalized radio wave intensity for each terminal model based on the notified determination result, and the distance between the wireless terminal 101 and the packet capture device 102 based on the calculated radio wave intensity. May be estimated.

<Second Embodiment>
Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 9 is a block diagram illustrating a functional configuration of the wireless positioning apparatus 900 according to this embodiment.

  As illustrated in FIG. 9, the wireless positioning device 900 according to the present embodiment includes a characteristic information generation unit 901 and a model determination unit 902. These components constituting the wireless positioning device 900 are communicably connected by a known wired or wireless communication line. Hereinafter, each component will be described.

  The characteristic information generation unit 901 transmits one or more pieces of communication data transmitted from a wireless terminal (not shown) to a communication data processing device (not shown) via a wireless communication line, and the communication data in the communication data processing device. Based on the radio field intensity at the time of reception, first terminal characteristic information that is unique to each model of the wireless terminal is generated. Note that the characteristic information generation unit 901 may be the same as the characteristic information generation unit 201 in the first embodiment.

  The model discrimination unit 902 compares the first terminal characteristic information generated by the characteristic information generation unit 901 with the second terminal characteristic information determined in advance for each model of the wireless terminal, so that the wireless terminal Determine the model. Note that the model discrimination unit 902 may be the same as the model discrimination unit 202 in the first embodiment.

  The wireless terminal is a device capable of wireless communication based on an arbitrary wireless communication standard, and is connected to the communication data processing device so as to be communicable via an arbitrary wireless communication line. There may be a plurality of types of wireless terminals. The wireless terminal may be the same as the wireless terminal 101 in the first embodiment.

  A communication data processing device (not shown) is communicably connected to the wireless positioning device 900. The communication data processing device (not shown) may provide the communication data received from the wireless terminal, the radio wave intensity when the communication data is received, and the wireless positioning device 900. The communication data processing device may be the same as the packet capture device 102 in the first embodiment.

  Note that the wireless positioning device 900 in the present embodiment may function as the communication data processing device. In this case, the wireless positioning device 900 may transmit / receive communication data to / from the wireless terminal.

  The first terminal characteristic information is information unique to each model of the wireless terminal. The second terminal characteristic information is information predetermined for each wireless terminal model. For this reason, for example, the model determination unit 902 compares the second terminal attribute information most similar to the first terminal family information as a model of the wireless terminal by comparing them. It may be determined.

  As described above, the radio positioning device 900 according to the present embodiment is configured so that the terminal characteristic information generated based on the predetermined terminal characteristic information (second terminal characteristic information), communication data received from the wireless terminal, and the like ( The terminal model of the wireless terminal is determined based on the result of comparison with the first terminal characteristic information).

  For example, the wireless positioning device 900 according to the present embodiment normalizes the radio wave intensity of the communication radio wave received from the wireless terminal for each model of the determined wireless terminal, thereby correcting an error caused by the difference in the terminal model. It can be reduced. Thereby, the wireless positioning device 900 can estimate the distance from the wireless terminal with a small error.

  As described above, the wireless positioning device 900 according to the present embodiment can determine the model of the wireless communication terminal based on the communication data (packet) transmitted from the wireless communication terminal. Also, the wireless positioning device 900 can estimate the distance between the wireless data terminal and the communication data processing device that has received the communication data based on the radio wave intensity corrected using the determination result.

<Third Embodiment>
Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 10 is a block diagram illustrating a functional configuration of the wireless positioning apparatus 1000 according to this embodiment.

  As illustrated in FIG. 10, the wireless positioning device 1000 according to the present embodiment includes a normalization unit 1001 and a distance conversion unit 1002. These components constituting the wireless positioning device 1000 are communicably connected by a well-known wired or wireless communication line and a communication line combining them. Hereinafter, each component will be described.

  The normalization unit 1001 obtains the model information indicating the model of the wireless terminal and the radio wave intensity when the communication data processing device receives the communication data transmitted by the wireless terminal via the wireless communication line. The radio field intensity is normalized using a normalization constant determined in advance for each terminal model.

  The model information indicating the model of the wireless terminal may be given in advance for each wireless terminal. In addition, the normalization unit 1001 may acquire model information separately determined based on communication data received from a wireless terminal. Note that the normalization unit 1001 in the present embodiment may be the same as the radio wave intensity normalization unit 203 in the first embodiment.

  The distance conversion 1002 converts the radio wave intensity normalized by the normalization unit 1001 into a distance between the communication data processing device and the wireless terminal. The distance conversion 1002 in the present embodiment may be the same as the distance conversion unit 204 in the first embodiment.

  The wireless terminal may be the same as the wireless terminal in the second implementation system and others. The communication data processing device may be the same as the communication data processing device in the second implementation system and others.

  Note that the wireless positioning device 1000 in the present embodiment may function as the communication data processing device. In this case, the wireless positioning device 1000 may transmit / receive communication data to / from the wireless terminal.

  As described above, the wireless positioning device 1000 according to the present embodiment normalizes the radio wave intensity of the communication radio wave received from the wireless terminal based on the model information indicating the model of the wireless terminal, so that the difference between the terminal models It is possible to reduce the error caused by. Thereby, the wireless positioning device 1000 can estimate the distance between the wireless terminal and the communication data processing device with a small error.

  From the above, the wireless positioning device 1000 according to the present embodiment determines the model of the wireless communication terminal and determines the distance between the wireless terminal and the communication data processing device based on the radio wave intensity corrected using the determination result. It can be estimated.

<Configuration of hardware and software program (computer program)>
Hereinafter, hardware and software program configurations capable of realizing each of the above-described embodiments will be described. Below, especially the structure of the terminal distance estimation apparatus 103 in each said embodiment and the wireless positioning apparatus (900, 1000) is demonstrated. Hereinafter, these may be collectively referred to as a “wireless positioning device”. Note that the packet capture device 102 and the output device 104 in the first embodiment can also be configured by hardware and software programs described below.

  The wireless positioning device described in each of the above embodiments may be configured by a dedicated hardware device. In that case, each unit shown in the above drawings may be realized as hardware (an integrated circuit or the like on which processing logic is mounted) that is partially or wholly integrated.

  The wireless positioning device may be configured by hardware as illustrated in FIG. 11 and various software programs (computer programs) executed by the hardware.

  An arithmetic device 1101 in FIG. 11 is an arithmetic processing device such as a general-purpose CPU (Central Processing Unit) or a microprocessor. For example, the arithmetic device 1101 may read various software programs stored in a nonvolatile storage device 1103 to be described later into the storage device 1102 and execute processing according to the software programs.

  The storage device 1102 is a memory device such as a RAM (Random Access Memory) that can be referred to from the arithmetic device 1101, and stores software programs, various data, and the like. The storage device 1102 may be a volatile memory device.

  The non-volatile storage device 1103 is a non-volatile storage device such as a ROM (Read Only Memory) using a semiconductor storage device or a flash memory, and may store various software programs, data, and the like.

  The drive device 1104 is, for example, a device that processes reading and writing of data with respect to an external storage medium 1105 described later.

  The external recording medium 1105 is an arbitrary recording medium capable of recording data, such as an optical disk, a magneto-optical disk, and a semiconductor flash memory.

  The network interface 1106 is an interface device that connects the wireless positioning device and a wired or wireless communication device and an arbitrary communication network configured by combining them so that they can communicate with each other. The wireless positioning device in this embodiment may be connected to a communication network via the network interface 1106, for example, and may transmit / receive various data to / from a wireless terminal or a packet capture device.

  The present invention described by taking each embodiment described above as an example, for example, configures a wireless positioning device by the hardware device illustrated in FIG. 11, and realizes the functions described in each of the above embodiments for the wireless positioning device. It may be realized by supplying possible software programs. In this case, the present invention may be achieved by the arithmetic device 1101 executing the software program supplied to the wireless positioning device.

  In each embodiment described above, each unit illustrated in each of the above drawings can be realized as a software module, which is a function (processing) unit of a software program executed by the hardware described above. However, the division of each software module shown in these drawings is a configuration for convenience of explanation, and various configurations can be assumed for implementation.

  For example, when the wireless positioning device illustrated in FIG. 2, FIG. 9, and FIG. 10 is realized as a software module, these software modules are stored in the nonvolatile storage device 1103, and the arithmetic device 1101 performs each process. These software modules may be read out to the storage device 1102 when executed.

  In addition, these software modules may be configured to transmit various data to each other by an appropriate method such as shared memory or interprocess communication. With such a configuration, these software modules can be connected so as to communicate with each other.

  Further, each software program is recorded in the external storage medium 1105, and the software program is appropriately stored in the nonvolatile memory 1103 through the drive device 1104 at the shipping stage or operation stage of the wireless positioning device. You may comprise.

  In the above case, the method for supplying various software programs to the wireless positioning device is carried out in the wireless positioning device using an appropriate jig at the manufacturing stage before shipment or the maintenance stage after shipment. An installation method may be adopted. As a method for supplying various software programs, a general procedure may be adopted at present, such as a method of downloading from the outside via a communication line such as the Internet.

  In such a case, the present invention can be understood to be constituted by a code constituting the software program or a computer-readable storage medium in which the code is recorded.

  In the above, this invention was demonstrated as an example applied to exemplary embodiment mentioned above. However, the technical scope of the present invention is not limited to the scope described in the above embodiments. It will be apparent to those skilled in the art that various modifications and improvements can be made to such embodiments. In such a case, new embodiments to which such changes or improvements are added can also be included in the technical scope of the present invention. This is clear from the matters described in the claims.

  A part or all of the above-described embodiment and its modifications may be described as the following supplementary notes. However, the present invention described by way of example with the above-described embodiment and its modifications is not limited to the following.

(Appendix 1)
The wireless terminal based on one or more pieces of communication data transmitted from the wireless terminal to the communication data processing device via a wireless communication line and the radio wave intensity when the communication data processing device receives the communication data Information acquisition means characteristic information generation means for generating first terminal characteristic information which is unique information for each model of
By comparing the first terminal characteristic information generated by the information acquisition means characteristic information generating means with the second terminal characteristic information predetermined for each model of the wireless terminal, the model of the wireless terminal is determined. A model discriminating means for discriminating;
A wireless positioning device.

(Appendix 2)
For each model of the wireless terminal, it is obtained by acquiring model information indicating the model of the wireless terminal and the radio wave intensity when the communication data processing device receives communication data transmitted by the wireless terminal via a wireless communication line. Normalizing means for normalizing the radio field intensity using a predetermined normalization constant;
Distance conversion means for converting the radio field intensity normalized by the normalization means into a distance between the communication data processing device and the wireless terminal;
A wireless positioning device.

(Appendix 3)
Normalizing means for normalizing the radio field intensity using a normalization constant determined in advance for each model of the wireless terminal based on the model of the wireless terminal determined by the model determining means;
Distance conversion means for converting the radio field intensity normalized by the normalization means into a distance between the communication data processing device and the wireless terminal;
The wireless positioning device according to Appendix 1, further comprising:

(Appendix 4)
Information acquisition means characteristic information generation means for generating first terminal characteristic information unique to information for each model of the wireless terminal based on one or more communication data transmitted by the wireless terminal and the radio wave intensity When,
Model discrimination for discriminating the model of the wireless terminal by comparing the first terminal characteristic information generated by the information acquisition means with the second terminal characteristic information predetermined for each model of the wireless terminal. Means further comprising:
The normalization means normalizes the radio field intensity using a normalization constant predetermined for each model of the wireless terminal based on the model information of the wireless terminal determined by the model determination means. The described wireless positioning device.

(Appendix 5)
The information acquisition means characteristic information generation means includes:
The transmission frequency of communication data in the wireless terminal, and
When the communication data processing apparatus receives a plurality of communication data from the wireless terminal, the first terminal characteristic information including at least one of the radio wave intensity patterns generated based on the information regarding each communication data is generated. And
The second terminal characteristic information includes at least one of the transmission frequency predetermined for each model of the wireless terminal and the radio field intensity pattern,
The model discrimination means includes at least one of the transmission reliability information and the radio wave intensity pattern included in the first terminal characteristic information, and the transmission reliability information and the radio wave intensity pattern included in the second terminal characteristic information. Determining the model of the wireless terminal based on the result of comparison with at least one of
The wireless positioning device according to attachment 3 or attachment 4.

(Appendix 6)
The information acquisition unit characteristic information generation unit includes a statistic relating to an interval of reception time when one or more communication data is received from the wireless terminal in the communication data processing device, and a statistic relating to the number of times the communication data is received. , Calculating the transmission frequency based on at least one of the following:
The wireless positioning device according to appendix 5.

(Appendix 7)
The characteristic information generating means includes
Communication data transmitted by the communication terminal to a specific communication channel included in a plurality of communication channels set in the wireless communication line and another communication channel different from the specific communication channel, Obtaining the respective radio field strengths when the communication data processing device receives on the specific communication channel;
Based on the acquired radio field intensity, the radio field intensity pattern is generated by calculating an attenuation rate of the radio field intensity in the other communication channel with respect to the radio field intensity in the specific communication channel.
The wireless positioning device according to any one of appendix 5 or appendix 6.

(Appendix 8)
The information acquisition unit characteristic information generation unit continuously transmits to one communication channel when the wireless terminal transmits communication data while switching a plurality of communication channels set in the wireless communication line. The above radio wave intensity pattern is generated by calculating the number of packets.
The wireless positioning device according to any one of appendix 5 to appendix 7.

(Appendix 9)
The device itself has a function of functioning as the communication data processing device.
The wireless positioning device according to any one of supplementary notes 1 to 8.

(Appendix 10)
A wireless positioning device according to any one of appendix 1 to appendix 8,
The wireless terminal is connected to be communicable via the wireless line,
Receive communication data sent from the wireless terminal,
Measure the above radio wave intensity when receiving the communication data,
A communication data processing device that provides at least the received communication data and the measured radio field intensity to the wireless terminal device;
A wireless positioning system.

(Appendix 11)
Information processing device
The wireless terminal based on one or more pieces of communication data transmitted from the wireless terminal to the communication data processing device via a wireless communication line and the radio wave intensity when the communication data processing device receives the communication data To generate first terminal characteristic information that is unique to different information for each model,
Determining the model of the wireless terminal by comparing the generated first terminal characteristic information with the second terminal characteristic information predetermined for each model of the wireless terminal;
Wireless terminal positioning method.

(Appendix 12)
Information processing device
By obtaining and obtaining model information indicating the model of the wireless terminal and the radio wave intensity when the communication data processing device receives the communication data transmitted by the wireless terminal via a wireless communication line, for each model of the wireless terminal Normalize the radio field intensity using a predetermined normalization constant,
The normalized radio field intensity is converted into a distance between the communication data processing device and the wireless terminal.
Wireless terminal positioning method.

(Appendix 13)
On the computer,
The wireless terminal based on one or more pieces of communication data transmitted from the wireless terminal to the communication data processing device via a wireless communication line and the radio wave intensity when the communication data processing device receives the communication data Processing for generating first terminal characteristic information that is unique to information for each model of
A process of determining the model of the wireless terminal by comparing the generated first terminal characteristic information with second terminal characteristic information predetermined for each model of the wireless terminal; ,
Computer program.

(Appendix 14)
On the computer,
For each model of the wireless terminal, it is obtained by acquiring model information indicating the model of the wireless terminal and the radio wave intensity when the communication data processing device receives communication data transmitted by the wireless terminal via a wireless communication line. A process for normalizing the radio field intensity using a predetermined normalization constant;
Causing the normalized radio field intensity to be converted into a distance between the communication data processing device and the wireless terminal;
Computer program.

  The present invention is applicable to, for example, various systems that utilize the result of estimating the distance from a packet capture device to each wireless terminal for wireless terminals of different models.

  Specifically, in the technology disclosed in each embodiment of the present invention, for example, when information is distributed to a user who travels in a facility, the estimation accuracy of the distance from the packet capture device to the wireless terminal carried by the user It is possible to improve. For this reason, for example, one packet capture device can control distribution information for a plurality of wireless terminals in accordance with the distance between the packet capture device and the wireless terminal. That is, the technology disclosed in each embodiment of the present invention distributes information to wireless terminals with a smaller number of packet capture devices than, for example, other known technologies disclosed in each of the above patent documents. It is feasible.

  In addition, the present invention described by taking the above embodiments as an example improves the estimation accuracy of the distance from the packet capture device to the wireless terminal, so that the user is approaching the packet capture device, is stagnating, or away Since it is possible to determine the movement state of the user, for example, the distribution information can be controlled according to the movement state.

DESCRIPTION OF SYMBOLS 100 Wireless positioning system 101 Wireless terminal 102 Packet capture apparatus 103 Terminal distance estimation apparatus 104 Output apparatus 201 Characteristic information generation part 202 Model discrimination | determination part 203 Radio wave intensity normalization part 204 Distance conversion part 205 Model information storage part 206 Normalization constant memory | storage part 900 Wireless positioning device 901 Characteristic information generation unit 902 Model discrimination unit 1000 Wireless positioning device 1001 Normalization unit 1002 Distance conversion unit 1101 Computing device 1102 Storage device 1103 Non-volatile storage device 1104 Drive device 1105 External recording medium 1106 Network interface

Claims (10)

The wireless terminal based on one or more pieces of communication data transmitted from the wireless terminal to the communication data processing device via a wireless communication line and the radio wave intensity when the communication data processing device receives the communication data Characteristic information generating means for generating first terminal characteristic information, which is information of each model,
A model for discriminating the model of the wireless terminal by comparing the first terminal characteristic information generated by the characteristic information generating means with the second terminal characteristic information predetermined for each model of the wireless terminal. Discrimination means;
A wireless positioning device. The model information indicating the model of the wireless terminal and the radio wave intensity when the communication data processing device receives the communication data transmitted by the wireless terminal via the wireless communication line are obtained and predetermined for each model of the wireless terminal. Normalization means for normalizing the radio field intensity using a normalization constant,
Distance conversion means for converting the radio field intensity normalized by the normalization means into a distance between the communication data processing device and the wireless terminal;
A wireless positioning device. Based on the model of the wireless terminal determined by the model determining means, normalization means for normalizing the radio field intensity using a normalization constant predetermined for each model of the wireless terminal;
Distance conversion means for converting the radio field intensity normalized by the normalization means into a distance between the communication data processing device and the wireless terminal;
The wireless positioning device according to claim 1, further comprising: Characteristic information generating means for generating first terminal characteristic information, which is model-specific information of the wireless terminal, based on one or more communication data transmitted by the wireless terminal and the radio field intensity;
A model discriminating unit that discriminates the model of the wireless terminal by comparing the first terminal characteristic information with second terminal characteristic information predetermined for each model of the wireless terminal;
The normalization means normalizes the radio field intensity using a normalization constant predetermined for each model of the wireless terminal based on the model information of the wireless terminal determined by the model determination means. The wireless positioning device described in 1. The characteristic information generating means includes
Frequency of transmission of communication data in the wireless terminal, and
When the communication data processing device receives a plurality of pieces of communication data from the wireless terminal, the first terminal characteristic information including at least one of the radio wave intensity patterns generated based on the information about each communication data is generated. And
The second terminal characteristic information includes at least one of the transmission frequency predetermined for each model of the wireless terminal and the radio field intensity pattern,
The model discriminating means includes at least one of the transmission reliability information and the radio wave intensity pattern included in the first terminal characteristic information, and the transmission reliability information and the radio wave intensity pattern included in the second terminal characteristic information. Determining the model of the wireless terminal based on the result of comparing with at least one of
The wireless positioning device according to claim 3 or 4. The characteristic information generating means includes at least one of a statistic relating to an interval of reception time when one or more communication data is received from the wireless terminal in the communication data processing device and a statistic relating to the number of times the communication data is received. Calculating the transmission frequency based on
The wireless positioning device according to claim 5. The characteristic information generating means includes
Communication data transmitted by the communication terminal to a specific communication channel included in a plurality of communication channels set in the wireless communication line and another communication channel different from the specific communication channel, Obtaining the respective radio field strengths when the communication data processing device receives on the specific communication channel;
Based on the acquired radio field intensity, the radio field intensity pattern is generated by calculating an attenuation rate of the radio field intensity in the other communication channel with respect to the radio field intensity in the specific communication channel.
The wireless positioning device according to claim 5 or 6. When the wireless terminal transmits communication data while switching a plurality of communication channels set in the wireless communication line, the characteristic information generating means transmits the number of packets continuously transmitted to one communication channel. To generate the radio field intensity pattern by calculating
The wireless positioning device according to any one of claims 5 to 7. Information processing device
The wireless terminal based on one or more pieces of communication data transmitted from the wireless terminal to the communication data processing device via a wireless communication line and the radio wave intensity when the communication data processing device receives the communication data 1st terminal characteristic information which is information according to the model of
Determining the model of the wireless terminal by comparing the generated first terminal characteristic information and second terminal characteristic information predetermined for each model of the wireless terminal;
Wireless terminal positioning method. On the computer,
The wireless terminal based on one or more pieces of communication data transmitted from the wireless terminal to the communication data processing device via a wireless communication line and the radio wave intensity when the communication data processing device receives the communication data Processing for generating first terminal characteristic information which is information of each model,
A process of determining the model of the wireless terminal by comparing the generated first terminal characteristic information with second terminal characteristic information predetermined for each model of the wireless terminal; ,
Computer program.

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