Equipment layout design device, equipment layout design method, and equipment layout design program

Abstract

To reduce a time required to design the placement of transmitters and receivers in a target area when performing sensing using wireless communication.SOLUTION: An equipment layout design device 300 includes: a placement candidate acquisition unit 331 that acquires candidate placement positions for the transmitter and receiver in the target area; a first model creation unit 332 that creates model information for the target area that reflects the positions of the transmitter and receiver using radio wave propagation simulation to calculate radio wave propagation information for the target area; a first CSI prediction unit 333 that calculates the radio wave propagation information from the transmitter to the receiver using the radio wave propagation simulation and the model information and predicts propagation channel information obtained by the receiver for each of multiple subcarriers of a radio signal received by the receiver placed in the target area; and an evaluation calculation unit 336 that evaluates the placement position of the receiver on the basis of an amplitude value of the propagation channel information for each of the multiple subcarriers.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates to an equipment layout design device, an equipment layout design method, and an equipment layout design program. [Background technology]

[0002] There are known techniques for detecting objects using wireless signals. For example, Patent Document 1 describes a wireless object detection device that measures channel state information (CSI) in a target area while changing measurement parameters of wireless signals transmitted between a transmitting station and a receiving station, and detects objects in the target area using a learning model that is machine-learned from the measurement results of the multiple pieces of CSI. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 7209296 Summary of the Invention [Problem to be solved by the invention]

[0004] When performing sensing using propagation channel information (CSI), it is desirable to efficiently locate transmitters and receivers in a way that makes sensing easier. Conventionally, it was necessary to actually locate transmitters and receivers in the target area, collect a large amount of propagation channel information (CSI), and analyze it to determine their placement. Therefore, with conventional technology, it takes time to introduce sensing using propagation channel information (CSI), and there was a need to shorten this introduction time.

[0005] The present disclosure is intended to solve the above-mentioned problems, and aims to provide an equipment layout design device, an equipment layout design method, and an equipment layout design program that reduce the time required to design the layout of transmitters and receivers in a target area when performing sensing using wireless communication. [Means for solving the problem]

[0006] The equipment layout design device according to the present disclosure includes: a layout candidate acquisition unit that acquires candidate layout positions for a transmitter and a receiver in a target area; a model creation unit that creates model information for the target area that reflects the positions of the transmitter and the receiver using a radio wave propagation simulation; a prediction unit that calculates radio wave propagation information from the transmitter to the receiver using the radio wave propagation simulation and the model information, and predicts propagation channel information obtained by the receiver, which is placed in the target area, for each of a plurality of subcarriers of a radio signal received by the receiver; and an evaluation calculation unit that evaluates the layout position of the receiver based on the predicted amplitude values ​​of the propagation channel information for each of the plurality of subcarriers.

[0007] An equipment layout design method according to the present disclosure is an equipment layout design method executed by an equipment layout design device that designs layout positions of transmitters and receivers in a target area, and includes: a layout candidate acquisition step of acquiring candidate layout positions of the transmitter and the receiver in the target area; a model creation step of creating model information of the target area that reflects the positions of the transmitter and the receiver using a radio wave propagation simulation, for calculating radio wave propagation information of the target area; a prediction step of calculating radio wave propagation information from the transmitter to the receiver using the radio wave propagation simulation and the model information, and predicting propagation channel information obtained by the receiver, arranged in the target area, for each of a plurality of subcarriers of a radio signal received by the receiver; and an evaluation calculation step of evaluating the layout position of the receiver based on the predicted amplitude values ​​of the propagation channel information for each of the plurality of subcarriers.

[0008] The equipment layout design program according to the present disclosure causes a computer to execute the following steps: a layout candidate acquisition step of acquiring candidate layout positions for a transmitter and a receiver in a target area; a model creation step of creating model information for the target area that reflects the positions of the transmitter and the receiver using a radio wave propagation simulation to calculate radio wave propagation information for the target area; a prediction step of calculating radio wave propagation information from the transmitter to the receiver using the radio wave propagation simulation and the model information, and predicting propagation channel information obtained by the receiver for each of a plurality of subcarriers of a radio signal received by the receiver placed in the target area; and an evaluation calculation step of evaluating the layout position of the receiver based on the predicted amplitude values ​​of the propagation channel information for each of the plurality of subcarriers. [Effects of the Invention]

[0009] According to the present disclosure, it is possible to reduce the time required to design the layout of transmitters and receivers in a target area for wireless communication. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a schematic diagram showing an example of a communication system according to this embodiment. [Figure 2] FIG. 2 is a schematic diagram illustrating an example of the radio signal illustrated in FIG. [Figure 3] FIG. 3 is a diagram illustrating an example of the relationship between the number of antennas and propagation channel information (CSI) according to the embodiment. [Figure 4] FIG. 4 is a schematic block diagram of an equipment layout design apparatus according to this embodiment. [Figure 5] FIG. 5 is a schematic diagram illustrating an example of a functional configuration of the control unit illustrated in FIG. [Figure 6] FIG. 6 is a flowchart showing an example of a processing procedure of a design method executed by the equipment layout design device. [Figure 7] FIG. 7 is a diagram for explaining an evaluation example of the equipment layout design device. [Figure 8]FIG. 8 is a schematic diagram illustrating an example of a circuit configuration of a receiver. [Figure 9] FIG. 9 is a flowchart showing an example of a method for deriving a conversion formula used in an equipment layout design apparatus. [Figure 10] FIG. 10 is a diagram showing the relationship between the distance between antennas and the amplitude value of the propagation channel information (CSI). [Figure 11] FIG. 11 is a diagram showing the relationship between the AGC value and the amount of radio wave attenuation. [Figure 12] FIG. 12 is a diagram showing an example of the relationship between the amplitude value of the subcarrier and the subcarrier number at different distances between antennas. DETAILED DESCRIPTION OF THE INVENTION

[0011] Preferred embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. Note that the present disclosure is not limited to these embodiments, and when there are multiple embodiments, the present disclosure also includes configurations in which the respective embodiments are combined.

[0012] (Embodiment) (Communication Systems) Fig. 1 is a schematic diagram showing an example of a communication system according to this embodiment, and Fig. 2 is a schematic diagram showing an example of a radio signal shown in Fig. 1.

[0013] 1, a communication system 10 according to an embodiment includes a transmitter 100 and a receiver 200 that receives a wireless signal 1000 from the transmitter 100. In this embodiment, the transmitter 100 and the receiver 200 are located in a target area E, and perform short-range wireless communication using WiFi (registered trademark).

[0014] In the example shown in FIG. 1 , the communication system 10 includes one transmitter 100 and one receiver 200, but the number of transmitters 100 and receivers 200 may be any number. For example, the communication system 10 may include multiple receivers 200, and transmit a wireless signal 1000 from the transmitter 100 to each of the multiple receivers 200. For example, the communication system 10 may include multiple transmitters 100, and transmit a wireless signal 1000 from the multiple transmitters 100 to the receivers 200. The communication system 10 may have a case where a detectable event 3000 exists between the transmitter 100 and the receiver 200, and a case where the detectable event 3000 does not exist. The detectable event 3000 includes, for example, a person, an animal, a moving object, an obstacle, a fire, the material of an object, etc. that are to be detected by sensing in the target area E.

[0015] As shown in FIG. 2, the wireless signal 1000 employs the Orthogonal Frequency Division Multiplexing (OFDM) method, and is a signal for transmitting data by forming carrier waves (hereinafter referred to as subcarriers) of multiple different frequencies within the frequency band being used.

[0016] A wireless signal 1000 has multiple subcarriers 1100, each of which is divided into multiple different frequency bands. For example, IEEE 802.11a / g / n / ac has 63 subcarriers 1100 in one channel (20 MHz). The subcarriers 1100 have a sine wave waveform and transmit bit information, etc. Of the multiple subcarriers 1100 in the wireless signal 1000, five of the highest and lowest frequencies and one in the middle of the channel are null subcarriers 1100A that mitigate interference between channels. Of the remaining multiple subcarriers 1100 in the wireless signal 1000, four are pilot subcarriers 1100B that transmit known patterns for adjustment (calibration) to mitigate the effects of OFDM multipath fading.

[0017] (Transmitter) As shown in Fig. 1, the transmitter 100 has an antenna 110 and a transmitting unit 120. The transmitter 100 may have one antenna 110 or a plurality of antennas 110. Note that Fig. 1 shows only the configuration of the transmitter 100 related to transmission of a radio signal 1000, and omits other configurations.

[0018] The antenna 110 is electrically connected to the transmitting unit 120 and is configured to be able to emit radio waves (electromagnetic waves) including the radio signal 1000 from the transmitting unit 120. The antenna 110 may or may not have directionality.

[0019] The transmitter 120 emits a radio signal 1000 addressed to the receiver 200 from the antenna 110, the radio signal 1000 including information necessary for the receiver 200 to estimate propagation channel information (CSI). The transmitter 120 employs the OFDM system, and performs data transmission by forming subcarriers 1100 (carrier waves) of multiple different frequencies in a single channel frequency band and emitting radio waves.

[0020] (Receiver) As shown in Fig. 1, receiver 200 includes antenna 210, receiving unit 220, CSI acquisition unit 230, and detection unit 240. Receiver 200 may include one antenna 210 or multiple antennas 210. Note that Fig. 1 illustrates only the configuration of receiver 200 related to receiving wireless signal 1000, and omits other configurations.

[0021] The antenna 210 is electrically connected to the receiving unit 220 and is configured to be able to receive radio waves including the radio signal 1000 emitted by the transmitter 100. The antenna 210 supplies the received signal to the receiving unit 220. The antenna 210 may or may not have directionality.

[0022] The receiver 220 is electrically connected to the CSI acquirer 230 , extracts the radio signal 1000 from the radio waves received from the transmitter 100 via the antenna 210 , and supplies the radio signal 1000 to the CSI acquirer 230 .

[0023] The CSI acquisition unit 230 is electrically connected to the detection unit 240, and estimates and calculates propagation channel information (CSI) using information necessary for estimating the CSI included in the radio signal 1000 received by the reception unit 220, and supplies the propagation channel information (CSI) to the detection unit 240. The CSI acquisition unit 230, for example, calculates the amplitude, phase, etc. of the subcarrier 1100 as the propagation channel information (CSI) using the received radio signal 1000, and supplies the propagation channel information (CSI) to the detection unit 240. The propagation channel information (CSI) includes amplitude information and phase information for each OFDM subcarrier in the propagation path between the antenna 110 of the transmitter 100 and the antenna 210 of the receiver 200, information on the relative values ​​between the antennas, etc. The propagation channel information (CSI) is expressed in dimensions of, for example, the number of antennas and subcarriers of the transmitter 100 and the receiver 200, and time.

[0024] The detection unit 240 detects detection targets (people, animals, moving objects, obstacles, fires, object materials, etc.) in the target area E based on the propagation channel information (CSI) from the CSI acquisition unit 230. The detection unit 240 can analyze the amplitude and phase for each subcarrier path in the reception state indicated by the propagation channel information (CSI), and therefore detects changes in the radio wave propagation environment between the transmitter 100 and the receiver 200 and detection targets based on changes in amplitude and phase between the number of subcarriers, the number of transmitting antennas, and the number of receiving antennas.

[0025] In this embodiment, the detection unit 240 has a function of analyzing propagation channel information (CSI) to detect intrusion into the target area E, estimate the number of people, detect the outbreak of a fire, etc. The detection unit 240 detects the radio wave propagation path from the transmitter 100 to the receiver 200 in the target area E, the radio wave strength (amount of radio wave attenuation) at that point, etc., based on the propagation channel information (CSI) from the CSI acquisition unit 230. The detection unit 240 may also have a function of detecting intrusion, estimating the number of people, detecting the outbreak of a fire, etc. The detection unit 240 analyzes, for example, the amplitude values ​​of multiple subcarriers that have changed along the radio wave propagation path, and detects intrusion into the target area E, estimates the number of people, detects the outbreak of a fire, etc. The detection unit 240 may use machine learning to analyze the amplitude values ​​of multiple subcarriers.

[0026] 3 is a diagram illustrating an example of the relationship between the number of antennas and propagation channel information (CSI) according to an embodiment. In this embodiment, as shown in FIG. 3, the communication system 10 includes a transmitter 100 having three antennas 110A, 110B, and 110C, and a receiver 200 having three antennas 210a, 210b, and 210c. When the transmitter 100 emits radio waves from the antennas 110A, 110B, and 110C, the receiver 200 acquires propagation channel information (CSI) that can identify the amplitude and phase of each subcarrier for each path between the antennas 210a, 210b, and 210c and the antennas 210a, 210b, and 210c of the receiver 200. The propagation channel information (CSI) includes amplitude and phase information of (the number of subcarriers 1100) × (the number of antennas 110 of the transmitter 100) × (the number of antennas 210 of the receiver 200).

[0027] When the CSI acquisition unit 230 of the receiver 200 acquires propagation channel information (CSI), the detection unit 240 detects changes in the radio wave propagation environment around the transmitter 100 and the receiver 200 in the target area E and the detection target based on changes in the propagation channel information (CSI).

[0028] (Equipment layout design device) Fig. 4 is a schematic block diagram of an equipment layout design device according to this embodiment. Fig. 5 is a schematic diagram showing an example of the functional configuration of the control unit 330 shown in Fig. 4. The equipment layout design device 300 shown in Fig. 4 has a function of designing and evaluating the layout of transmitters 100 and receivers 200 in a target area E. The equipment layout design device 300 is, for example, a computer, and includes a communication unit 310, a storage unit 320, and a control unit 330.

[0029] The communication unit 310 is a module used by the control unit 330 to communicate with external devices such as the transmitter 100 and the receiver 200, and may include, for example, an antenna. In this embodiment, the communication method used by the communication unit 310 is wireless communication, but the communication method may be any.

[0030] The storage unit 320 is a memory that stores various information such as the calculation contents and programs of the control unit 330, and includes at least one of a RAM, a main storage device such as a ROM, and an external storage device such as a HDD. The storage unit 320 can store programs, propagation channel information (CSI), device information, environmental information, radio wave propagation simulation (software), an equipment layout design program, etc.

[0031] The control unit 330 is a calculation device and includes a calculation circuit such as a CPU (Central Processing Unit). The control unit 330 includes a placement candidate acquisition unit 331, a first model creation unit 332, a first CSI prediction unit 333, a second model creation unit 334, a second CSI prediction unit 335, an evaluation calculation unit 336, and a derivation unit 337. The control unit 330 reads out an equipment layout design program from the storage unit 320 and executes it to realize the placement candidate acquisition unit 331, the first model creation unit 332, the first CSI prediction unit 333, the second model creation unit 334, the second CSI prediction unit 335, the evaluation calculation unit 336, and the derivation unit 337 and execute these processes. That is, the equipment layout design program causes the control unit 330 (computer) to execute a placement candidate acquisition step, a first model creation step, a first CSI prediction step, a second model creation step, a second CSI prediction step, an evaluation calculation step, etc.

[0032] The control unit 330 may execute these processes using one CPU, or may be provided with multiple CPUs and execute the processes using the multiple CPUs. Some of the functions of the control unit 330 may be realized by a hardware circuit, an external computer, or the like. Furthermore, the program for the control unit 330 saved in the storage unit 320 may be stored in a recording medium readable by the equipment layout design device 300.

[0033] In this embodiment, a case will be described in which the equipment layout design apparatus 300 realizes the model creation unit by using a first model creation unit 332 and a second model creation unit 334, but the present invention is not limited to this. Also, a case will be described in which the equipment layout design apparatus 300 realizes the prediction unit by using a first CSI prediction unit 333 and a second CSI prediction unit 335, but the present invention is not limited to this. For example, the equipment layout design apparatus 300 may be configured to realize the model creation unit and the prediction unit by using a combination of either the first model creation unit 332 and the first CSI prediction unit 333, or the second model creation unit 334 and the second CSI prediction unit 335.

[0034] 5, the placement candidate acquisition unit 331 acquires candidates for the placement positions of the transmitters 100 and the receivers 200 in the target area E in the equipment layout design device 300. For example, the placement candidate acquisition unit 331 acquires candidates for the placement positions of the transmitters 100 and the receivers 200 in the target area E from an input device, a server device, etc., and provides placement position information listing the acquired candidates for the placement positions to the first model creation unit 332. The placement candidate acquisition unit 331 can acquire candidates for the placement positions of the multiple transmitters 100 and receivers 200 in the target area E.

[0035] The first model creation unit 332 creates model information (hereinafter also referred to as a model) of the target area E that reflects the positions of the transmitter 100 and the receiver 200 in order to calculate radio wave propagation information for the target area E using radio wave propagation simulation when the detectable event 3000 is not present in the target area E. The radio wave propagation simulation is a simulation using a known propagation simulator. The radio wave propagation simulation is a simulation that calculates the amount of radio wave attenuation (radio wave intensity) using a ray tracing method by inputting the model information for the target area E, the positions of the transmission point and the reception point, and the radio wave frequency, taking into account structures such as buildings that obstruct the propagation of radio waves from the transmission point to the reception point. The model created by the first model creation unit 332 has propagation model information that can identify the target area E that reflects the positions of the transmitter 100 and the receiver 200 and their propagation environment in order to calculate radio wave propagation information for the target area E using radio wave propagation simulation. The model includes information that incorporates the environment in which the transmitter 100 and the receiver 200 are located, information that shows a high-precision three-dimensional map, and other information. The first model creation unit 332 acquires various information such as the range, structures, materials, reflectance, etc. of the target area E in a state where the detectable event 3000 does not exist from a database, storage medium, electronic device, etc., and creates a model of the target area E (without the detectable event) based on the acquired information. The first model creation unit 332 provides the created model to the first CSI prediction unit 333 and the second model creation unit 334.

[0036] The first CSI prediction unit 333 calculates radio wave propagation information from the transmitter 100 to the receiver 200 using a radio wave propagation simulation in the propagation environment indicated by the model of the first model creation unit 332. The first CSI prediction unit 333 acquires device information of the transmitter 100 and the receiver 200 and stores the information in the storage unit 320. The device information includes, for example, the frequency of the radio signal 1000, channel information, subcarrier information, etc. The first CSI prediction unit 333 uses a radio wave propagation simulation to which parameters based on the device information, the model from the first model creation unit 332, etc. are input, and the radio wave propagation calculation unit 333A calculates the amount of radio wave attenuation (radio wave intensity) for each of the multiple subcarriers 1100. The first CSI prediction unit 333 uses a radio wave propagation simulation to which parameters based on the device information, the model from the first model creation unit 332, etc. are input, and the CSI conversion unit 333B converts the amount of radio wave attenuation calculated by the radio wave propagation calculation unit 333A into an amplitude value of propagation channel information (CSI). The CSI conversion unit 333B predicts the propagation channel information (CSI) obtained by the receiver 200 by converting the amount of radio wave attenuation and the propagation channel information (CSI) for each of the multiple subcarriers 1100 using a conversion formula, conversion program, or the like. The first CSI prediction unit 333 associates the amplitude value of the predicted propagation channel information (CSI) with the subcarrier 1100 and stores it in the storage unit 320.

[0037] The second model creation unit 334 creates model information for the target area E that reflects the positions of the transmitter 100, the receiver 200, and the detectable event 3000, in order to calculate radio wave propagation information for the target area E using radio wave propagation simulation when the detectable event 3000 is present in the target area E. The model created by the second model creation unit 334 has propagation model information that can identify the target area E, reflecting the positions of the transmitter 100, the receiver 200, and the detectable event 3000, in order to calculate radio wave propagation information for the target area E using radio wave propagation simulation. Upon acquiring the detectable event information for the detectable event 3000, the second model creation unit 334 creates a model with the detectable event by reflecting the detectable event information in the model from the first model creation unit 332. The model with the detectable event includes information capturing the environment in which the transmitter 100 and the receiver 200 are located, information indicating a high-precision three-dimensional map, information indicating the position, material, and reflectivity of the detectable event 3000, etc. The second model creation unit 334 may create a model by acquiring various information such as the range, structures, materials, reflectance, etc. of the target area E in a state where the detection target event 3000 exists from a database, a storage medium, an electronic device, etc. The second model creation unit 334 provides the created model to the second CSI prediction unit 335.

[0038] The second CSI prediction unit 335 calculates radio wave propagation information from the transmitter 100 to the receiver 200 using a radio wave propagation simulation in a propagation environment where the detection target event 3000 indicated by the model of the second model creation unit 334 is present. The second CSI prediction unit 335 acquires device information of the transmitter 100 and the receiver 200, similar to the first CSI prediction unit 333. In the second CSI prediction unit 335, the radio wave propagation calculation unit 335A calculates the amount of radio wave attenuation (radio wave intensity) for each of the multiple subcarriers 1100 using a radio wave propagation simulation to which parameters based on the device information, the model from the second model creation unit 334, etc. are input. In the second CSI prediction unit 335, the CSI conversion unit 335B converts the amount of radio wave attenuation calculated by the radio wave propagation calculation unit 335A into an amplitude value of propagation channel information (CSI). The CSI conversion unit 335B predicts the propagation channel information (CSI) obtained by the receiver 200 by converting the amount of radio wave attenuation and the propagation channel information (CSI) for each of the multiple subcarriers 1100 using a conversion formula, conversion program, or the like. The first CSI prediction unit 333 associates the predicted amplitude value of the propagation channel information (CSI) with the subcarrier 1100 and stores it in the storage unit 320. An example of the conversion formula will be described later.

[0039] The evaluation calculation unit 336 evaluates the placement positions of the transmitter 100 and the receiver 200 based on the amplitude values ​​of the propagation channel information (CSI) for each of the multiple subcarriers 1100 predicted by the first CSI prediction unit 333 and the second CSI prediction unit 335, and provides an evaluation result. Generally, Wi-Fi sensing detects a detection target event 3000 using fluctuations in the amplitude values ​​of the propagation channel information (CSI), and it is believed that the greater the fluctuations, the easier it is to detect. Therefore, the evaluation calculation unit 336 calculates the difference in the amplitude values ​​of the propagation channel information (CSI) calculated using a model with and without the detection target event 3000 for each subcarrier 1100, and if the total difference for all subcarriers 1100 is greater than the threshold value of the threshold information, evaluates the placement positions of the transmitter 100 and the receiver 200 as good because it is easy to detect the wireless signal 1000. If the total difference of all subcarriers 1100 is smaller than the threshold value of the threshold information, the evaluation calculation unit 336 evaluates the placement position of the transmitter 100 and the receiver 200 as poor because it is difficult to detect the wireless signal 1000 at that position. Note that the evaluation of the placement positions of the transmitter 100 and the receiver 200 may be changed according to the detection target event 3000. If the placement evaluation is good, the evaluation calculation unit 336 may adopt the placement of the transmitter 100 and the receiver 200 as being easy to sense. If the placement evaluation is poor, the evaluation calculation unit 336 notifies the placement candidate acquisition unit 331 that it will evaluate another placement position candidate again. Furthermore, the evaluation calculation unit 336 may be configured to process multiple placement position candidates using the first CSI prediction unit 333 and the second CSI prediction unit 335, and evaluate the one with the best evaluation result as the placement position. The evaluation calculation unit 336 may be configured to evaluate only the placement position of the receiver 200, or may be configured to evaluate only the placement position of the transmitter 100. The evaluation calculation unit 336 supplies the evaluation result to an external device or the like, or supplies the result to the placement candidate acquisition unit 331.

[0040] Known radio wave propagation simulations cannot predict changes in the propagation channel information (CSI). For this reason, the equipment layout design device 300 according to this embodiment calculates the amount of radio wave attenuation for each subcarrier 1100 using the radio wave propagation simulation, and converts the amount of radio wave attenuation into propagation channel information (CSI) using a conversion formula, thereby evaluating the ease of sensing at the placement position of the receiver 200.

[0041] The derivation unit 337 measures the amplitude value of the propagation channel information (CSI) when the distance between the transmitter 100 and the receiver 200 is changed in an environment where there is no reflection of radio waves, and derives a conversion formula according to the amount of radio wave attenuation calculated from the distance. The derivation unit 337 derives the conversion formula by mathematically formulating each process based on the circuit processing of the communication unit 310, and supplies the conversion formula to the first CSI prediction unit 333, the second CSI prediction unit 335, etc. An example of a method for deriving the conversion formula by the derivation unit 337 will be described later.

[0042] In this embodiment, the equipment layout design device 300 is described as having a configuration in which the control unit 330 includes a layout candidate acquisition unit 331, a first model creation unit 332, a first CSI prediction unit 333, a second model creation unit 334, a second CSI prediction unit 335, and an evaluation calculation unit 336. However, the configuration is not limited to this. For example, the equipment layout design device 300 may be configured to handle only the case where there is no detectable event, in which the control unit 330 includes the layout candidate acquisition unit 331, the first model creation unit 332, the first CSI prediction unit 333, and the evaluation calculation unit 336. For example, the equipment layout design device 300 may be configured to handle only the case where there is a detectable event, in which the control unit 330 includes the layout candidate acquisition unit 331, the second model creation unit 334, the second CSI prediction unit 335, and the evaluation calculation unit 336. The equipment layout design device 300 may be configured such that the derivation unit 337 is implemented by another device, a server device, an electronic device, or the like, and acquires the conversion formula.

[0043] In this embodiment, the equipment layout design device 300 will be described as using a case where the first CSI prediction unit 333 and the second CSI prediction unit 335 calculate radio wave propagation information for the target area E using radio wave propagation simulation, but is not limited to this. For example, the equipment layout design device 300 may be configured to calculate the radio wave propagation information for the target area E using a machine learning model that has been machine-learned from results of measuring the radio wave propagation path from the transmitter 100 to the receiver 200, the radio wave intensity (amount of radio wave attenuation) at that point, and the like, depending on the radio wave environment.

[0044] (Design method for equipment layout design device) Fig. 6 is a flowchart showing an example of the processing procedure of the design method executed by the equipment layout design device 300. The processing procedure shown in Fig. 6 is executed by the control unit 330, for example, when the equipment layout design device receives a WiFi sensing request.

[0045] 6, the control unit 330 of the equipment layout design device 300 acquires information necessary for layout design of the transmitters 100 and the receivers 200 (step S101). For example, the control unit 330 acquires candidate layout position information, environmental information, detectable event information, equipment information, etc., and associates these with each other and stores them in the storage unit 320. When the process of step S101 ends, the control unit 330 proceeds to step S102.

[0046] The control unit 330 determines whether or not a conversion formula is available (step S102). For example, the control unit 330 determines that a conversion formula is available when a conversion formula for converting radio wave attenuation into an amplitude value of propagation channel information (CSI) is stored in the storage unit 320. If the control unit 330 determines that a conversion formula is available (Yes in step S102), the control unit 330 proceeds to step S105, which will be described later. If the control unit 330 determines that a conversion formula is not available (No in step S102), the control unit 330 proceeds to step S103.

[0047] The control unit 330 acquires a conversion formula (step S103). For example, the control unit 330 acquires a conversion formula suitable for the hardware of the transmitter 100 and the receiver 200 indicated by the device information, the surrounding propagation environment, etc. from a database, a server device, etc., and stores the conversion formula in the storage unit 320. When the process of step S103 ends, the control unit 330 proceeds to the process of step S104.

[0048] The control unit 330 acquires candidate placement positions for the transmitter 100 and the receiver 200 (step S104). For example, the control unit 330 acquires candidate information that lists candidates for placement patterns (placement positions) of the transmitter 100 and the receiver 200 in the target area E, and stores the candidate information in the storage unit 320. When the process of step S104 ends, the control unit 330 advances the process to step S105.

[0049] The control unit 330 predicts the amount of radio wave attenuation at the candidate placement location using radio wave propagation simulation (step S105). For example, the control unit 330 calculates the amount of radio wave attenuation (radio wave intensity) for each of the plurality of subcarriers 1100 for each of the cases where the detectable event 3000 does not exist and where the detectable event 3000 exists, using the radio wave propagation simulation and model, and stores the calculated amounts in the storage unit 320. When the process of step S105 ends, the control unit 330 proceeds to step S106.

[0050] The control unit 330 predicts the amplitude value of the propagation channel information (CSI) (step S106). For example, the control unit 330 converts the amount of radio wave attenuation calculated in step S105 into an amplitude value of the propagation channel information (CSI) for each of the multiple subcarriers 1100 using a conversion formula, and stores the converted value in the storage unit 320. When the control unit 330 completes the process of step S106, the process proceeds to step S107.

[0051] The control unit 330 determines whether the evaluation of the placement position is good (step S107). For example, the control unit 330 determines that the evaluation of the placement position is good when the fluctuation in the amplitude value of the propagation channel information (CSI) is greater than a threshold. In particular, the control unit 330 calculates the difference in the amplitude value of the propagation channel information (CSI) calculated using a model with and without the detection target event 3000 for each subcarrier 1100, and determines that the evaluation of the placement position is good when the total difference for all subcarriers 1100 is greater than the threshold value of the threshold information. If the control unit 330 determines that the evaluation of the placement position is not good (No in step S107), the control unit 330 returns to the process of step S104 described above and repeats the series of processes to evaluate a different placement position from the placement position candidates. If the control unit 330 determines that the evaluation of the placement position is good (Yes in step S107), the control unit 330 proceeds to step S108.

[0052] The control unit 330 determines the placement positions of the transmitter 100 and the receiver 200 (step S108). This allows the equipment layout design device 300 to determine the placement of the transmitter 100 and the receiver 200 that facilitates Wi-Fi sensing. The control unit 330 may notify the determined placement positions of the transmitter 100 and the receiver 200. When the process of step S108 ends, the control unit 330 proceeds to step S109.

[0053] The control unit 330 applies sensing at the determined placement position (step S109). For example, the control unit 330 notifies the receiver 200 via the communication unit 310 that Wi-Fi sensing will be applied. This enables the receiver 200 to analyze the propagation channel information (CSI) and perform highly accurate detection of intrusions into the target area E, estimation of the number of people, and detection of fire outbreaks. When the process of step S109 ends, the control unit 330 ends the processing procedure shown in FIG. 6.

[0054] (Example of evaluation of equipment layout design equipment) 7 is a diagram illustrating an example of evaluation by the equipment layout design device 300. As shown in Fig. 7, the communication system 10 acquires two different layout patterns P1 and P2 as layout positions of the receivers 200 relative to the transmitters 100 in the target area E.

[0055] For the receiver 200 of placement pattern P1, the equipment layout design device 300 creates a model for the case where the detectable event 3000 does not exist, calculates the amount of radio wave attenuation for each of the multiple subcarriers 1100 using radio wave propagation simulation, and converts the amount of radio wave attenuation into amplitude information G10 of the propagation channel information (CSI).The equipment layout design device 300 then creates a model for the case where the detectable event 3000 exists, calculates the amount of radio wave attenuation for each of the multiple subcarriers 1100 using radio wave propagation simulation, and converts the amount of radio wave attenuation into amplitude information G11 of the propagation channel information (CSI).The amplitude information G10 and the amplitude information G11 indicate the relationship between amplitude and subcarrier.The equipment layout design device 300 evaluates the placement position as being poor because the predicted changes in the amplitude information G10 and the amplitude information G11 are small.

[0056] Next, for the receiver 200 of placement pattern P2, the layout design device 300 creates a model for the case where the detectable event 3000 does not exist, calculates the amount of radio wave attenuation for each of the subcarriers 1100 using radio wave propagation simulation, and converts the amount of radio wave attenuation into amplitude information G20 of the propagation channel information (CSI). The layout design device 300 then creates a model for the case where the detectable event 3000 exists, calculates the amount of radio wave attenuation for each of the subcarriers 1100 using radio wave propagation simulation, and converts the amount of radio wave attenuation into amplitude information G21 of the propagation channel information (CSI). The amplitude information G20 and the amplitude information G21 indicate the relationship between amplitude and subcarrier. The layout design device 300 evaluates the placement position as being good because the predicted changes in the amplitude information G20 and the amplitude information G21 are large. Therefore, the layout design device 300 can evaluate that placement pattern P2 is more suitable than placement pattern P1 as the placement position of the receiver 200.

[0057] As described above, the equipment layout design device 300 calculates radio wave propagation information by radio wave propagation simulation based on a model of the target area E in which the transmitter 100 and the receiver 200 are to be placed, thereby enabling the layout design of the transmitter 100 and the receiver 200 without having to visit the target area E. Therefore, the equipment layout design device 300 can reduce the work of collecting and adjusting propagation channel information (CSI) on-site, which was previously performed, and can reduce the man-hours and time required to introduce WiFi sensing. As a result, the equipment layout design device 300 can efficiently design the layout of the transmitter 100 and the receiver 200 in the target area E in which wireless communication is performed, thereby reducing the time required for layout design.

[0058] The equipment layout design device 300 can also evaluate the layout of existing transmitters 100 and receivers 200 by acquiring environmental information, equipment information, etc. of the target area E. This allows the equipment layout design device 300 to evaluate whether WiFi sensing can be realized using the existing transmitters 100 and receivers 200, making it possible to effectively utilize the existing transmitters 100 and receivers 200, which can contribute to reducing costs and the time required for implementation.

[0059] The equipment layout design device 300 predicts the amplitude values ​​of the subcarriers 1100 of the propagation channel information (CSI) of the wireless signal 1000 received when the detectable event 3000 is not present in the target area E, and the amplitude values ​​of the subcarriers 1100 of the propagation channel information (CSI) of the wireless signal 1000 received when the detectable event 3000 is present in the target area E, and evaluates the placement position of the receiver based on the amplitude values ​​when the detectable event 3000 is not present and when the detectable event 3000 is present in the target area E. In this way, the equipment layout design device 300 can evaluate whether or not the receiver 200 is suitable for detecting the detectable event 3000, because the greater the variation in amplitude depending on the presence or absence of the detectable event 3000, the easier it is for the receiver 200 to detect the detectable event 3000.

[0060] The equipment layout design device 300 calculates the difference in amplitude value between when the detection target event 3000 is not present in the target area E and when the detection target event 3000 is present, for each of the multiple subcarriers 1100, and evaluates the placement position of the receiver 200 based on the sum of the differences for all the subcarriers 1100 and threshold information. In this way, the equipment layout design device 300 can perform evaluation based on the amplitude values ​​of multiple different frequencies by using the sum of the differences for the subcarriers 1100, thereby improving the accuracy of the determination.

[0061] The equipment layout design device 300 predicts the amplitude values ​​of the subcarriers of the propagation channel information (CSI) of the wireless signal 1000 using a conversion formula between the amount of radio wave attenuation and the propagation channel information (CSI) for each of the plurality of subcarriers 1100. As a result, the equipment layout design device 300 can perform evaluation based on the amplitude values ​​of a plurality of frequencies by predicting the amplitude values ​​of the plurality of subcarriers through calculation using the conversion formula, thereby improving the accuracy of judgment.

[0062] (WiFi chip) FIG. 8 is a schematic diagram showing an example of the circuit configuration of the receiver 200. The receiver 200 has a WiFi chip 20 shown in FIG. 8. The WiFi chip 20 is a chipset for building a wireless network. The WiFi chip 20 has a CSI unit 21 and an RSSI unit 22. The CSI unit 21 and the RSSI unit 22 are each electrically connected to three antennas 210a, 210b, and 210c via an LNA 23 and an AGC 24. The LNA 23 is a low noise amplifier that amplifies signals received by the antennas 210a, 210b, and 210c. The AGC 24 is an automatic gain control that outputs signals at a constant level regardless of the level of the input signal.

[0063] The CSI unit 21 measures the amplitude, phase, etc. of each subcarrier as propagation channel information (CSI) from the radio signal 1000 received from each of the antennas 210a, 210b, and 210c, and outputs the propagation channel information (CSI) that combines the measurement results via an analog-to-digital converter (ADC) 25. The RSSI unit 22 outputs the radio wave strength of each of the antennas 210a, 210b, and 210c as a received signal strength indicator (RSSI) via an ADC 26. In this embodiment, the RSSI unit 22 outputs the radio wave strength of the antenna 210a as RSSIa, the radio wave strength of the antenna 210b as RSSIb, and the radio wave strength of the antenna 210c as RSSIc.

[0064] Radio waves received by antenna 210a, antenna 210b, and antenna 210c pass through the LNA 23 and AGC 24 to be adjusted to an appropriate reception power. In the WiFi chip 20, the AGC 24 operates according to the radio wave strength (radio wave attenuation) of the radio waves from the transmitter 100, and receives the radio waves at an appropriate reception strength. This processing is applied to all subcarriers. Meanwhile, the propagation channel information (CSI) of the WiFi chip 20 is a relative value that represents the difference in radio wave strength (radio wave attenuation) between the subcarriers 1100. Because each subcarrier 1100 has a different wavelength, in a multipath environment, there is a difference in the degree of constructive and destructive interference between the waves, resulting in a difference in the amount of radio wave attenuation (selective fading).

[0065] (How to derive the conversion formula) FIG. 9 is a flowchart showing an example of a method for deriving a conversion formula used in the equipment layout design device 300. FIG. 10 is a diagram showing the relationship between the distance between antennas and the amplitude value of propagation channel information (CSI). In FIG. 10, the horizontal axis represents the distance between antennas, and the vertical axis represents the amplitude value of propagation channel information (CSI). FIG. 11 is a diagram showing the relationship between the AGC value and radio wave attenuation. In FIG. 11, the horizontal axis represents radio wave attenuation [dB], and the vertical axis represents the AGC value. FIG. 12 is a diagram showing an example of the relationship between the amplitude value of subcarriers and subcarrier numbers for different distances between antennas. In FIG. 12, the horizontal axis represents the subcarrier number, and the vertical axis represents the subcarrier amplitude value, and the results of measurements are shown for antenna distances ranging from 1.5 m to 8 m.

[0066] In this embodiment, a case will be described in which the equipment layout design device 300 derives the conversion formula, but the conversion formula may be derived by a computer, a server device, or the like different from the equipment layout design device 300. The derivation unit 337 of the equipment layout design device 300 derives the conversion formula by mathematically formulating each process based on the circuit processing of the WiFi chip 20.

[0067] 9, the equipment layout design device 300 calculates the values ​​of the propagation channel information (CSI), AGC, and RSSI when the distance between the transmitter 100 and the receiver 200 is changed in an environment such as an anechoic chamber where unnecessary reflection of radio waves does not occur (step S201). For example, in order to investigate the relationship between the AGC value and radio wave strength (radio wave attenuation), the equipment layout design device 300 measures the amplitude value of the propagation channel information (CSI) when the distance between the transmitter 100 and the receiver 200 is changed in a state where an environment where unnecessary reflections do not occur (an environment without multipath) is created inside an anechoic chamber or the like, and calculates the relationship with the geometrically determined radio wave attenuation. After completing the process of step S201, the equipment layout design device 300 proceeds to step S202.

[0068] The equipment layout design device 300 determines whether or not there is a difference in the amplitude value of the propagation channel information (CSI) under each condition (step S202). For example, the equipment layout design device 300 compares the amplitude values ​​of the propagation channel information (CSI) measured under each condition at different distances, and determines whether or not there is a difference in the amplitude values ​​based on the comparison result. When the equipment layout design device 300 confirms that the amplitude value of the propagation channel information (CSI) of each subcarrier does not change significantly under each distance condition, as shown in Fig. 10, it determines that there is no difference in the amplitude values.

[0069] 9, if the equipment layout design device 300 determines that a difference has occurred in the amplitude values ​​(Yes in step S202), the amplitude values ​​have changed significantly, and there is a possibility that reflections have occurred from the surroundings, so the process returns to step S201, which has already been described. Then, once measures have been taken to prevent reflections, the equipment layout design device 300 executes step S201 again to perform the above measurements again. On the other hand, if the equipment layout design device 300 determines that no difference has occurred in the amplitude values ​​(No in step S202), the process proceeds to step S203.

[0070] The equipment layout design device 300 performs regression analysis on the relationship between the amount of radio wave attenuation calculated from the distance between the transmitter 100 and the receiver 200 and the AGC value, and derives a regression equation (step S203). For example, as shown in Fig. 11, the equipment layout design device 300 performs regression analysis on the relationship between the amount of radio wave attenuation and the AGC value, derives the regression equation, and stores it in the storage unit 320. When the equipment layout design device 300 completes the process of step S203 shown in Fig. 9, it proceeds to step S204.

[0071] The component layout design device 300 determines whether the amplitude values ​​at the ends of the subcarriers 1100 are lower than the amplitude values ​​at the center (step S204). For example, as shown in Fig. 12, when amplitude values ​​of the propagation channel information (CSI) measured under different conditions of distance between antennas, the amplitude values ​​of the end numbers of the subcarrier numbers assigned in ascending order of frequency of the subcarriers 1100 may be lower than the amplitude values ​​of the center numbers of the subcarriers. This is thought to be because the amplitude values ​​of the propagation channel information (CSI) at the end subcarrier numbers are lower due to the influence of a guard band specific to Wi-Fi radio waves.

[0072] 9, if the equipment layout design device 300 determines that the amplitude value at the end of the subcarrier 1100 is not lower than the amplitude value at the center (No in step S204), the process proceeds to step S206, which will be described later. If the equipment layout design device 300 determines that the amplitude value at the end of the subcarrier 1100 is lower than the amplitude value at the center (Yes in step S204), the process proceeds to step S205.

[0073] The equipment layout design device 300 uses the data calculated in step S201 to derive a conversion formula for correcting the differences between the subcarriers 1100 so as to eliminate differences between them (step S205). For example, the equipment layout design device 300 derives a conversion formula for correcting the differences between the subcarriers 1100 so as to eliminate tendencies specific to Wi-Fi radio waves. When the processing of step S205 is completed, the equipment layout design device 300 proceeds to step S206.

[0074] The equipment layout design device 300 multiplies the amplitude value by a coefficient to convert it into the dimension of radio wave attenuation, and reflects it in the conversion formula (step S206). The amplitude value of the propagation channel information (CSI) is a relative value that represents the difference in radio wave strength (radio wave attenuation) between subcarriers, so it is converted into the dimension of radio wave attenuation [dB] when reflected in the conversion formula. The equipment layout design device 300 uses the RSSI value for the conversion. RSSI reflects the total power of all subcarriers 1100. Therefore, the following relationship shown in (Equation 1) holds between the propagation channel information (CSI) [dimensionless value] and RSSI [dB].

number

[0075] For this reason, the equipment layout design device 300 multiplies the amplitude value of the propagation channel information (CSI) by the coefficient ρ shown in the following (Equation 2) derived from (Equation 1), converts it into the dimension of radio wave attenuation [dB], and reflects it in the conversion formula. Note that in (Equation 1) and (Equation 2), C i is the amplitude value of the propagation channel information (CSI) for subcarrier number i, n is the number of subcarriers 1100, and ρ is a coefficient. Upon completing the process of step S206, the equipment layout design apparatus 300 advances the process to step S207.

number

[0076] The equipment layout design device 300 derives a conversion formula in which the amplitude values ​​are converted into the dimension of radio wave attenuation and the average value of the converted values ​​is subtracted as an offset (step S207). The equipment layout design device 300 adjusts the overall offset by subtracting the average value of the converted values ​​of the amplitude values ​​of the propagation channel information (CSI) measured in an anechoic chamber or the like into the dimension of radio wave attenuation [dB] as an offset. For example, the equipment layout design device 300 derives the conversion formula shown in the following (Formula 3). In (Formula 3), A is the AGC value, R is the RSSI value, C i is the amplitude value of the propagation channel information (CSI) of subcarrier number i, a i , b i are the coefficients and intercepts for AGC, and c i , d i indicates the coefficient and intercept related to the propagation channel information (CSI), and e indicates the overall offset. i A+b i ) is the value [dB] of the AGC 24, and the antilogarithm part of the logarithm is the watt ratio of the CSI unit 21. When the process of step S207 ends, the equipment layout design device 300 ends the process procedure shown in FIG.

number

[0077] As described above, the equipment layout design device 300 measures the amplitude value of the propagation channel information (CSI) when the distance between the transmitter 100 and the receiver 200 is changed in an environment where there is no radio wave reflection, and derives a conversion formula according to the amount of radio wave attenuation calculated from the distance. This enables the equipment layout design device 300 to convert the amount of radio wave attenuation (radio wave intensity) and the propagation channel information (CSI), making it possible to predict the propagation channel information (CSI) in combination with a radio wave propagation simulation, and contributing to a reduction in the time required for layout design of the transmitter 100 and the receiver 200 in the target area E where wireless communication will be performed.

[0078] (Other embodiments) In the above-described embodiment, the equipment layout design device 300 is described as a device independent of the communication system 10, but the present invention is not limited to this. For example, the equipment layout design device 300 may be incorporated into the configuration of the communication system 10. In other words, the equipment layout design method may be executed by a computer included in the communication system 10.

[0079] In this embodiment, the method for deriving the conversion formula has been described as being implemented by the equipment layout design device 300, but this is not limiting. For example, the method for deriving the conversion formula may be implemented by the receiver 200. Furthermore, when sensing the detection target event 3000, the receiver 200 may use a conversion formula to convert the propagation channel information (CSI), RSSI, and AGC acquired by the communication device into radio wave strength (radio wave attenuation) and use this value to detect the detection target event 3000. In this way, the receiver 200 can compare spectra using values ​​converted from the amplitude value of the propagation channel information (CSI) to radio wave attenuation using the conversion formula. In this case, because the propagation channel information (CSI) dependent on the WiFi chip 20 is not used, there is no need to consider and develop sensing logic for each chip. Logic developed for radio wave strength (radio wave attenuation) can be applied to other WiFi chips, enabling the reuse of software assets. This allows the receiver 200 to reduce the man-hours and time required to consider logic for each chip.

[0080] (effect) The equipment layout design device 300 includes an arrangement candidate acquisition unit 331 that acquires candidates for arrangement positions of the transmitter 100 and the receiver 200 in a target area E, a first model creation unit 332 that creates a model of the target area E reflecting the positions of the transmitter 100 and the receiver 200 using radio wave propagation simulation to calculate radio wave propagation information for the target area E, a first CSI prediction unit 333 that calculates radio wave propagation information from the transmitter 100 to the receiver 200 using the radio wave propagation simulation and the model information, and predicts propagation channel information (CSI) obtained by the receiver 200 for each of multiple subcarriers of a radio signal 1000 received by the receiver 200 arranged in the target area E, and an evaluation calculation unit 336 that evaluates the arrangement position of the receiver 200 based on the amplitude value of the predicted propagation channel information (CSI) for each of multiple subcarriers 1100. This allows the equipment layout design device 300 to design the layout of the receiver 200 without visiting the target area E. Therefore, the equipment layout design device 300 can reduce the amount of work required to collect and adjust propagation channel information (CSI) on-site, which was previously required, and can therefore reduce the number of steps and time required to introduce WiFi sensing. As a result, the equipment layout design device 300 can efficiently design the layout of receivers 200 in target area E where wireless communication is performed, thereby shortening the time required for layout design.

[0081] In the equipment layout design device 300, the first CSI prediction unit 333 and the second CSI prediction unit 335 (prediction units) predict the amplitude value of the subcarriers 1100 of the propagation channel information (CSI) of the wireless signal 1000 received when the detectable event 3000 is not present in the target area E, and the amplitude value of the subcarriers 1100 of the propagation channel information (CSI) of the wireless signal 1000 received when the detectable event 3000 is present in the target area E, and the evaluation calculation unit 336 evaluates the placement position of the receiver 200 based on the amplitude values ​​when the detectable event 3000 is not present and when the detectable event 3000 is present in the target area E. In this way, the equipment layout design device 300 can evaluate whether or not the receiver 200 is suitable for detecting the detectable event 3000, because the greater the variation in the amplitude value depending on the presence or absence of the detectable event 3000, the easier it is for the receiver 200 to detect the detectable event 3000.

[0082] In equipment layout design device 300, evaluation calculation unit 336 calculates, for each subcarrier 1100, the difference in amplitude value between when a detectable event 3000 is not present in target area E and when a detectable event 3000 is present, and evaluates the placement position of receiver 200 based on the sum of the differences for all subcarriers 1100 and threshold information. In this way, equipment layout design device 300 can perform evaluation based on amplitude values ​​of a plurality of different frequencies by using the sum of the differences for subcarriers 1100, thereby improving the accuracy of judgment.

[0083] In the equipment layout design device 300, the first CSI prediction unit 333 and the second CSI prediction unit 335 predict amplitude values ​​of the subcarriers 1100 of the propagation channel information (CSI) of the wireless signal 1000 using a conversion formula between the amount of radio wave attenuation and the propagation channel information (CSI) for each of the plurality of subcarriers 1100. In this way, the equipment layout design device 300 can perform evaluation based on amplitude values ​​of a plurality of frequencies by predicting the amplitude values ​​of the plurality of subcarriers 1100 through calculation using the conversion formula, thereby improving the accuracy of determination.

[0084] In the equipment layout design device 300, the evaluation calculation unit 336 evaluates the layout positions of the transmitter 100 and the receiver 200 based on the amplitude values ​​of the propagation channel information (CSI) for each of the predicted multiple subcarriers. As a result, the equipment layout design device 300 can efficiently design the layout of the transmitter 100 and the receiver 200 in the target area E where wireless communication is performed by designing the layout of the transmitter 100 and the receiver 200 without visiting the target area E, thereby reducing the time required for the layout design.

[0085] The equipment layout design device 300 further includes a derivation unit 337 that measures amplitude values ​​of the propagation channel information (CSI) when the distance between the transmitter 100 and the receiver 200 is changed in an environment where radio wave reflection does not occur, and derives a conversion formula according to the amount of radio wave attenuation calculated from the distance. As a result, the equipment layout design device 300 derives a conversion formula according to the amount of radio wave attenuation calculated from the distance, making it possible to convert the amount of radio wave attenuation (radio wave intensity) and the propagation channel information (CSI), and making it possible to predict the propagation channel information (CSI) in combination with a radio wave propagation simulation.

[0086] The equipment layout design method is an equipment layout design method executed by an equipment layout design device 300 that designs the layout positions of the transmitter 100 and the receiver 200 in a target area E, and includes: a layout candidate acquisition step of acquiring candidates for the layout positions of the transmitter 100 and the receiver 200 in the target area E; a model creation step of creating a model of the target area E that reflects the positions of the transmitter 100 and the receiver 200 using radio wave propagation simulation to calculate radio wave propagation information of the target area E; a CSI prediction step of calculating radio wave propagation information from the transmitter 100 to the receiver 200 using the radio wave propagation simulation and the model information, and predicting propagation channel information (CSI) obtained by the receiver 200 for each of a plurality of subcarriers of a radio signal 1000 received by the receiver 200 placed in the target area E; and an evaluation calculation step of evaluating the layout position of the receiver 200 based on the amplitude value of the predicted propagation channel information (CSI) for each of a plurality of subcarriers 1100. This allows the equipment layout design method to have the equipment layout design device 300 perform layout design of the receivers 200 without the need to go to the target area E. Therefore, the equipment layout design method can eliminate the work of collecting and adjusting propagation channel information (CSI) on-site, which was previously required, and can reduce the man-hours and time required to introduce WiFi sensing. As a result, the equipment layout design method can efficiently design the layout of the receivers 200 in the target area E where wireless communication is performed, and can therefore shorten the time required for layout design.

[0087] The equipment layout design program causes a computer to execute the following steps: a layout candidate acquisition step of acquiring candidates for the layout positions of the transmitter 100 and the receiver 200 in the target area E, a model creation step of creating a model of the target area E reflecting the positions of the transmitter 100 and the receiver 200 using radio wave propagation simulation to calculate radio wave propagation information for the target area E, a CSI prediction step of calculating radio wave propagation information from the transmitter 100 to the receiver 200 using the radio wave propagation simulation and the model information and predicting propagation channel information (CSI) obtained by the receiver 200 for each of multiple subcarriers of a radio signal 1000 received by the receiver 200 placed in the target area E, and an evaluation calculation step of evaluating the layout position of the receiver 200 based on the amplitude value of the predicted propagation channel information (CSI) for each of the multiple subcarriers 1100. In this way, the equipment layout design program allows a computer to design the layout of the receiver 200 without having to visit the target area E. Therefore, the equipment layout design program can reduce the amount of work required to collect and adjust propagation channel information (CSI) on-site, which was previously required, thereby reducing the man-hours and time required to introduce WiFi sensing. As a result, the equipment layout design program can efficiently design the layout of receivers 200 in target area E where wireless communication will be performed, thereby shortening the time required for layout design.

[0088] Although the embodiments of the present disclosure have been described above, the embodiments are not limited to the contents of these embodiments. Furthermore, the above-described components include those that can be easily imagined by a person skilled in the art, those that are substantially the same, and those that are within the so-called equivalent range. Furthermore, the above-described components can be combined as appropriate. Furthermore, various omissions, substitutions, or modifications of the components can be made without departing from the spirit of the above-described embodiments.

[0089] In the embodiment of the present disclosure, the greater the fluctuation in the amplitude value, the easier it is to detect, and the index of ease of detection may be changed in accordance with the object to be detected and the detection logic. [Explanation of symbols]

[0090] 10. Communication Systems 20 WiFi chips 100 Transmitters 110 Antenna 200 receivers 210 Antenna 300 Equipment layout design device 310 Communications Department 320 Storage section 330 Control Unit 331 Placement candidate acquisition unit 332 First Model Creation Department 333 1st CSI Prediction Unit 334 Second Model Creation Department 335 Second CSI Prediction Unit 336 Evaluation Calculation Department 337 Derivation part 1000 radio signals 1100 subcarriers 3000 Events to be detected E. Target Area

Claims

1. a placement candidate acquisition unit that acquires candidates for placement positions of a transmitter and a receiver in a target area; a model creation unit that creates model information of the target area that reflects the positions of the transmitter and the receiver using a radio wave propagation simulation to calculate radio wave propagation information of the target area; a prediction unit that calculates radio wave propagation information from the transmitter to the receiver using the radio wave propagation simulation and the model information, and predicts propagation channel information obtained by the receiver for each of a plurality of subcarriers of a radio signal received by the receiver disposed in the target area; an evaluation calculation unit that evaluates the placement position of the receiver based on the predicted amplitude values ​​of the propagation channel information for each of the plurality of subcarriers; An equipment layout design device comprising:

2. the prediction unit predicts propagation channel information of the wireless signal received when a detection target event does not exist in the target area and the propagation channel information of the wireless signal received when the detection target event exists in the target area; 2. The equipment layout design device according to claim 1, wherein the evaluation calculation unit evaluates the placement position of the receiver based on the amplitude values ​​of the propagation channel information when the detection target event is not present in the target area and when the detection target event is present.

3. 3. The equipment layout design device according to claim 2, wherein the evaluation calculation unit calculates, for each subcarrier, a difference in the amplitude value of the propagation channel information between a case where the detection target event is not present in the target area and a case where the detection target event is present, and evaluates the placement position of the receiver based on a total of the differences for all the subcarriers and threshold information.

4. 4. The equipment layout design device according to claim 3, wherein the prediction unit predicts the amplitude value of the propagation channel information of the wireless signal using a conversion formula between radio wave attenuation and the propagation channel information for each of the plurality of subcarriers.

5. The equipment layout design device according to claim 4 , wherein the evaluation calculation unit evaluates the layout positions of the transmitter and the receiver based on the amplitude values ​​of the propagation channel information for each of the predicted plurality of subcarriers.

6. 6. The equipment layout design device according to claim 5, further comprising a derivation unit that measures amplitude values ​​of the propagation channel information when a distance between the transmitter and the receiver is changed in an environment where no radio wave reflection occurs, and derives the conversion formula according to the amount of radio wave attenuation calculated from the distance.

7. An equipment layout design method executed by an equipment layout design device that designs the layout positions of transmitters and receivers in a target area, comprising: a placement candidate acquisition step of acquiring candidates for placement positions of the transmitter and the receiver in the target area; a model creation step of creating model information of the target area that reflects the positions of the transmitter and the receiver using a radio wave propagation simulation to calculate radio wave propagation information of the target area; a prediction step of calculating radio wave propagation information from the transmitter to the receiver using the radio wave propagation simulation and the model information, and predicting propagation channel information obtained by the receiver for each of a plurality of subcarriers of a radio signal received by the receiver disposed in the target area; an evaluation calculation step of evaluating the placement position of the receiver based on the predicted amplitude values ​​of the propagation channel information for each of the plurality of subcarriers; An equipment layout design method, including:

8. a placement candidate acquisition step of acquiring candidates for placement positions of a transmitter and a receiver in a target area; a model creation step of creating model information of the target area that reflects the positions of the transmitter and the receiver using a radio wave propagation simulation to calculate radio wave propagation information of the target area; a prediction step of calculating radio wave propagation information from the transmitter to the receiver using the radio wave propagation simulation and the model information, and predicting propagation channel information obtained by the receiver for each of a plurality of subcarriers of a radio signal received by the receiver disposed in the target area; an evaluation calculation step of evaluating the placement position of the receiver based on the predicted amplitude values ​​of the propagation channel information for each of the plurality of subcarriers; An equipment layout design program that runs the above on a computer.

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