Reflection direction control device, reflection direction control method, and program

Abstract

To provide a technique for applying the same wireless reflector for both communications and wireless sensing.SOLUTION: A reflection direction control device that controls the reflection direction of a wireless reflector includes a memory unit that stores the reflection direction of the wireless reflector for each area in which a wireless sensing object exists, and a reflection direction control unit that sets the reflection direction of the wireless reflector to a reflection direction for communication purposes when the wireless reflector is used for communication, obtains the reflection direction corresponding to a specific area from the memory unit, and sets the reflection direction of the wireless reflector to the reflection direction corresponding to the specific area when the wireless reflector is used for wireless sensing of an object existing in the specific area.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a technique for controlling the reflection direction of a radio reflector. [Background technology]

[0002] As the use of high frequency bands in wireless communication systems expands, the effects of attenuation and shielding become greater. As a result, technical studies are being conducted on wireless base station designs that utilize wireless reflectors.

[0003] For example, Non-Patent Document 1 discloses a technology for converting a fluctuating non-line-of-sight area into a line-of-sight area without increasing the number of base stations in the area by installing a metal reflector whose reflection direction can be controlled within the area. Non-Patent Document 1 also discloses a technology for maximizing the number of terminals in a non-line-of-sight environment that can be accommodated in the coverage area of ​​the metal reflector.

[0004] In addition, wireless sensing technology that utilizes radio waves used in wireless communication to detect people or objects is being considered. For example, Non-Patent Document 2 discloses a technology that uses radio waves used in wireless communication to detect people and the open / closed state of doors. [Prior art documents] [Non-patent literature]

[0005] [Non-Patent Document 1] Shirasaka et al., "A study on improving the received power of 28GHz band indoor wireless systems in NLoS environments using a metal reflector," IEICE Technical Report, vol. 121, no. 391, RCS2021-271, pp. 108-113, March 2023. [Non-Patent Document 2] Docomo's wireless sensing can use radio waves as sensors, https: / / k-tai.watch.impress.co.jp / docs / news / 1475981.html Summary of the Invention [Problem to be solved by the invention]

[0006] When performing wireless sensing in an area where wireless reflectors are installed, it is expected that the area covered by wireless sensing can be expanded by utilizing the wireless reflectors.

[0007] However, in the conventional technology, the reflection direction control of the wireless reflector was performed only for communication purposes, such as the reflection direction control for maximizing the number of terminals within the coverage area of ​​the wireless reflector. Therefore, when performing wireless sensing using a wireless reflector used for communication, there is a possibility that the target area of ​​wireless sensing will be narrowed or the accuracy of wireless sensing will be reduced. In other words, in the conventional technology, there was a problem that it was difficult to apply the same wireless reflector to both communication and wireless sensing.

[0008] The present invention has been made in view of the above-mentioned points, and has an object to provide a technique for applying the same wireless reflector to both communication and wireless sensing. [Means for solving the problem]

[0009] According to the disclosed technology, there is provided a reflection direction control device for controlling the reflection direction of a wireless reflector, comprising: a storage unit that stores the reflection direction of the wireless reflector for each area in which a wireless sensing target object exists; a reflection direction control unit that, when the wireless reflector is used for communication, sets the reflection direction of the wireless reflector to a reflection direction for communication use, and, when the wireless reflector is used for wireless sensing of an object present in a specific area, acquires a reflection direction corresponding to the specific area from the storage unit and sets the reflection direction of the wireless reflector to the reflection direction corresponding to the specific area; A reflective direction control device is provided, comprising: Effect of the Invention

[0010] The disclosed technology enables the same wireless reflector to be applied to both communications and wireless sensing. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a diagram illustrating an example of the configuration of a reflection direction derivation control device 100. [Diagram 2] FIG. 2 is a diagram illustrating an example of the configuration of a reflection direction deriving device 300. [Diagram 3] FIG. 2 is a diagram showing an example of the configuration of a reflection direction control device 400. [Figure 4] 1 is a flowchart of the pre-derivation phase. [Diagram 5] FIG. 13 is a diagram for explaining data measurement in the pre-derivation phase. [Figure 6] 11A and 11B are diagrams illustrating an example of wireless sensing detection accuracy for each reflection direction. [Figure 7] 5A to 5C are diagrams illustrating examples of reflection directions for each position of a wireless sensing object in the first embodiment. [Figure 8] 4 is a flowchart of a control phase in the first embodiment. [Figure 9] FIG. 11 is a diagram showing an example of reflection direction candidates for each position of a wireless sensing object in the second embodiment. [Figure 10] 11 is a flowchart of a control phase in the second embodiment. [Figure 11] FIG. 2 illustrates an example of a hardware configuration of the apparatus. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, an embodiment of the present invention (the present embodiment) will be described with reference to the drawings. The embodiment described below is merely an example, and the embodiment to which the present invention is applied is not limited to the following embodiment.

[0013] In this embodiment, a reflection direction derivation control device 100 described later derives a reflection direction of a wireless reflector suitable for wireless sensing in advance and stores it in a storage unit. The reflection direction derivation control device 100 uses the data stored in the storage unit to dynamically switch the reflection direction of the wireless reflector depending on the state (communication state or wireless sensing state). The device configuration and operation of the reflection direction derivation control device 100 will be described in detail below.

[0014] (Example of device configuration) Fig. 1 shows an example of the device configuration of a reflection direction derivation control device 100 in this embodiment. As shown in Fig. 1, the reflection direction derivation control device 100 has a reflection direction derivation unit 110, a reflection direction control unit 120, a storage unit 130, and a communication unit 140. The storage unit may be called a database. Furthermore, the reflection direction derivation control device may be called a reflection direction control device.

[0015] As shown in Fig. 1, a wireless reflector 200 to be controlled is provided. In this embodiment, it is assumed that an IRS (Intelligent Reflecting Surface) capable of controlling reflection characteristics is used as the wireless reflector 200. However, this is not limited to this, and any type of wireless reflector 200 may be used. For example, a metal reflector or the like that mechanically controls the reflection direction may be used as the wireless reflector 200. The functional outline of each part is as follows.

[0016] The reflection direction derivation unit 110 derives the reflection direction of the wireless reflector 200 for each area in which an object of wireless sensing exists. The derived data of the reflection direction is stored in the storage unit 130. In this embodiment, the area in which an object of wireless sensing exists is, for example, an area of ​​a predetermined size, and is identified by its position (for example, the position of the center of gravity of the area).

[0017] The reflection direction control unit 120 controls the reflection direction of the wireless reflector 200 based on the data stored in the storage unit 130. The communication unit 140 communicates with the wireless reflector 200 in order to control the wireless reflector 200. When the reflection direction control unit 120 controls the wireless reflector 200, communication for control is performed via the communication unit 140.

[0018] Furthermore, when the reflection direction derivation unit 120 collects data to be used for deriving the reflection direction, the communication unit 140 communicates with a data collection destination (for example, a receiver described later) to collect the data. That is, when the reflection direction derivation unit 120 collects data to be used for deriving the reflection direction, the data is collected via the communication unit 140.

[0019] In the configuration shown in Fig. 1, the reflection direction derivation unit 110 and the reflection direction control unit 120 are provided in one device, but the present invention is not limited to this configuration. The reflection direction derivation unit 110 and the reflection direction control unit 120 may be provided in separate devices. Figs. 2 and 3 show examples of such a case.

[0020] FIG. 2 shows an example of the configuration of a reflection direction deriving device 300 that does not include a reflection direction control unit 120 but includes a reflection direction deriving unit 110.

[0021] Fig. 3 shows a configuration example of a reflection direction control device 400 that does not include a reflection direction derivation unit 110 and includes a reflection direction control unit 120. In the configuration example of Fig. 3, data on the reflection direction for each area in which a wireless sensing target exists is stored in advance in the storage unit 130. Note that a device in which the reflection direction derivation unit 110 is added to the reflection direction control device 400 may be called a reflection direction control device.

[0022] The operation of the reflection direction derivation unit 110 is common to the reflection direction derivation control device 100 and the reflection direction derivation device 300 , and the operation of the reflection direction control unit 120 is common to the reflection direction derivation control device 100 and the reflection direction control device 400 .

[0023] Hereinafter, as specific operational examples of the reflection direction derivation control device 100, a first embodiment and a second embodiment will be described.

[0024] Example 1 In the first embodiment (and the second embodiment), there is a pre-derivation phase for pre-deriving the reflection direction of the wireless reflector 200, and a control phase for controlling the reflection direction of the wireless reflector 200. Each of these will be described below.

[0025] (Example 1: Pre-derivation phase) In the pre-derivation phase, the reflection direction derivation control device 100 derives the reflection direction of a wireless reflector suitable for each area in which a wireless sensing object exists. The processing procedure of the pre-derivation phase will be described with reference to the flowchart of FIG.

[0026] <s1> In S1, the reflection direction deriving unit 110 performs data measurement and stores the measurement results in the storage unit .

[0027] An example of data measurement will be described with reference to Fig. 5. In the example shown in Fig. 5, a transmitter (TX), a receiver (RX), and a wireless reflector 200 (IRS) are provided. Also, there are obstacles (here, a whiteboard) and wireless sensing objects. Numbers 1 to 12 in Fig. 5 indicate positions (areas) where the wireless sensing objects are placed.

[0028] In S1, the reflection direction derivation unit 110 collects SNR (Signal to Noise Ratio) at the receiver (RX) while changing the reflection direction (θ) of the wireless reflector 200 (IRS) and the beam direction of the receiver (RX) and changing the position (1 to 12) of the wireless sensing object. The SNR (Signal to Noise Ratio) for "each reflection direction (θ), each receiver (RX) beam direction, and each position of the wireless sensing object" is stored in the storage unit 130. Note that the SNR is an example of the received signal quality. An index other than the SNR may be collected as the received signal quality.

[0029] <s2> The reflection direction derivation unit 110 performs machine learning using the data stored in the storage unit 130 to generate a model for each reflection direction.

[0030] The model may be generated by any method, for example, a random forest may be used, or a neural network may be used to generate the model.

[0031] In learning the model, for example, the "receiver (RX) beam direction and SNR" at the (correct) position of the wireless sensing target are input to the model, and the model parameters are repeatedly adjusted so that the output from the model indicates the correct position of the wireless sensing target. This model is generated for each reflection direction.

[0032] The output from the model is, for example, a probability (a value between 0 and 1) for each position of the wireless sensing target. The output from the model indicating the correct position of the wireless sensing target means that the probability of the correct position of the wireless sensing target is the largest among all the probabilities of the positions of the wireless sensing target.

[0033] <s3> In S3, the reflection direction derivation unit 110 uses the data collected in S1 and the model for each reflection direction learned in S2 to derive the wireless sensing detection accuracy for each position of the wireless sensing target for each reflection direction of the wireless reflector 200. The derived wireless sensing detection accuracy is stored in the storage unit 130.

[0034] For example, the wireless sensing detection accuracy when the wireless sensing object is present at a position (area) of coordinate 1 can be obtained by inputting the SNR for each receiver (RX) beam when the wireless sensing object is present at the position of coordinate 1 into a model, and outputting the model as the probability of the position of coordinate 1. By performing this process for each reflection direction, it is possible to derive the wireless sensing detection accuracy for each reflection direction and for each position of the wireless sensing object.

[0035] An example of the wireless sensing detection accuracy derived in S3 is shown in Fig. 6. In the example of Fig. 6, the wireless sensing detection accuracy corresponding to each position (each area) of the wireless sensing target object is shown for each of θ=0°, 8°, and 16°. In the example of Fig. 6, it is shown that the wireless sensing detection accuracy=1 is the best wireless sensing detection accuracy.

[0036] <s4> In S4, the reflection direction derivation unit 110 derives the reflection direction of the wireless reflector 200 corresponding to each position (each area) where the wireless sensing object exists. For example, the reflection direction derivation unit 110 uses the data derived in S3 to derive the reflection direction (θ) that provides the best wireless sensing detection accuracy for each position of the wireless sensing object.

[0037] 7 shows an example of the derivation result in S4. The derivation result is stored in the storage unit 130.

[0038] (Example 1: Control Phase) In the control phase, the reflection direction of the wireless reflector 200 is controlled according to whether the current state is a state in which the wireless reflector 200 is used for communication or a state in which the wireless reflector 200 is used for wireless sensing. The processing procedure of the control phase will be described with reference to the flowchart of FIG.

[0039] <s101> In the first embodiment, it is assumed that the wireless reflector 200 enters a state (called a reflection direction control state) in which it is necessary to control the reflection direction of the wireless reflector 200 in response to an instruction from a user, at a specific timing, or by other triggers. The reflection direction control state is either a communication state in which communication is performed using the wireless reflector 200, or a wireless sensing state in which wireless sensing is performed using the wireless reflector 200.

[0040] In S101, the reflection direction control unit 120 determines whether the current state is a reflection direction control state (a communication state or a wireless sensing state). If the current state is a communication state, the process proceeds to S102, and if the current state is a wireless sensing state, the process proceeds to S103.

[0041] <s102> In S102, which is a communication state, the reflection direction control unit 120 sets the reflection direction of the wireless reflector 200 to a reflection direction for communication. Control of the reflection direction of the wireless reflector 200 for communication is a conventional technique, and can be realized using the technique disclosed in Non-Patent Document 1, for example.

[0042] For example, the reflection direction control unit 120 adjusts the reflection direction of the wireless reflector 200 so that the radio waves from the base station can be reflected in the direction of the communication target (communication terminal).

[0043] <s103> In S103, which is the wireless sensing state, the reflection direction control unit 120 sets the reflection direction of the wireless reflector 200 to a reflection direction corresponding to the area in which the wireless sensing target exists. Specifically, the reflection direction control unit 120 acquires a reflection direction corresponding to the area in which the current wireless sensing target exists from the data of the reflection direction of the wireless reflector 200 for each area of ​​the wireless sensing target stored in the storage unit 130, and sets the reflection direction of the wireless reflector 200 to the acquired reflection direction.

[0044] Example 2 Next, a description will be given of Example 2. In Example 2, differences from Example 1 will be mainly described.

[0045] (Example 2: Pre-derivation phase) The process flow in the pre-derivation phase in the second embodiment is the same as that in the first embodiment, as shown in the flow of Fig. 4. In the second embodiment, the process of S4 is different from that in the first embodiment.

[0046] In S4 of the second embodiment, the reflection direction derivation unit 110 uses the data derived in S3 to derive reflection direction candidates (θ) with multiple priorities for each position of the wireless sensing object based on the priority of wireless sensing detection accuracy.

[0047] Fig. 9 shows an example of the derivation result in S4. The derivation result is stored in the storage unit 130. In the example of Fig. 9, for example, for a position of coordinate 1, the reflection direction with priority 1 has the highest wireless sensing accuracy, the wireless sensing accuracy decreases as the value of priority k increases, and the wireless sensing accuracy in the reflection direction with priority N is the lowest. However, such prioritization is just an example.

[0048] (Example 2: Control Phase) In the control phase of the second embodiment, there are three reflection direction control states: a state in which the wireless reflector 200 is used for communication, a state in which the wireless reflector 200 is used for wireless sensing, and a state in which the wireless reflector 200 is used for both communication and wireless sensing. The reflection direction control unit 120 controls the reflection direction of the wireless reflector 200 according to each state. The processing procedure of the control phase in the second embodiment will be described with reference to the flowchart of FIG.

[0049] <s201> In the second embodiment, it is assumed that the wireless reflector 200 enters a state (called a reflection direction control state) in which it is necessary to control the reflection direction of the wireless reflector 200 in response to an instruction from a user, at a specific timing, or by other triggers. As described above, the reflection direction control state is any one of a communication state in which communication is performed using the wireless reflector 200, a wireless sensing state in which wireless sensing is performed using the wireless reflector 200, and a state in which both communication and wireless sensing are performed using the wireless reflector 200.

[0050] In S201, the reflection direction control unit 120 determines whether the current state is a reflection direction control state (a communication state, a wireless sensing state, or a communication / wireless sensing compatible state), and if it is a communication state, proceeds to S202, if it is a wireless sensing state, proceeds to S203, and if it is a communication / wireless sensing compatible state, proceeds to S204.

[0051] <s202> In S202, which is a communication state, the reflection direction control unit 120 sets the reflection direction of the wireless reflector 200 to the reflection direction for communication. As in the first embodiment, the control in S202 is a conventional technique, and can be realized by using the technique disclosed in Non-Patent Document 1, for example.

[0052] <s203> In S203, which is the wireless sensing state, the reflection direction control unit 120 sets the reflection direction of the wireless reflector 200 to a reflection direction corresponding to the area where the wireless sensing target exists. Specifically, based on the data of the reflection direction candidates of the wireless reflector 200 for each area of ​​the wireless sensing target stored in the storage unit 130, the reflection direction control unit 120 acquires the reflection direction with the highest wireless sensing accuracy from a plurality of reflection directions corresponding to the area where the current wireless sensing target exists, and sets the reflection direction of the wireless reflector 200 to the acquired reflection direction. When the data in FIG. 9 is used, the reflection direction with the highest wireless sensing accuracy is the reflection direction with a priority of 1.

[0053] <s204> In S204 where communication and wireless sensing are both achieved, the reflection direction control unit 120 sets the reflection direction of the wireless reflector 200 to a reflection direction in which the communication quality for the communication target is equal to or higher than a reference value and the wireless sensing accuracy for the wireless sensing target area is equal to or higher than a reference value. As specific examples, examples 1 and 2 are shown.

[0054] Example 1: For example, if the wireless sensing accuracy for the wireless sensing target area is equal to or higher than a reference value and the priority for the corresponding area (coordinates) in the data of the candidate reflection directions of the wireless reflector 200 (e.g., FIG. 9 ) is 3 or a priority higher than 3, the reflection direction control unit 120 sets the reflection direction that provides the best communication quality for the communication target from among the three candidate reflection directions corresponding to priorities 1, 2, and 3 as the reflection direction of the wireless reflector 200.

[0055] Regarding the communication quality for the communication target, a communication quality derived in advance for each communication target and each reflection direction may be used, or the communication quality for the communication target may be calculated by a propagation simulation or the like.

[0056] When the communication quality in the reflection direction that provides the best communication quality for the communication target does not satisfy the reference value of the communication quality, the wireless sensing accuracy for the wireless sensing target area may be allowed to be lowered. For example, the reflection direction control unit 120 sets the reflection direction that provides the best communication quality for the communication target from among five reflection direction candidates corresponding to the priorities 1, 2, 3, 4, and 5 as the reflection direction of the wireless reflector 200.

[0057] Example 2: When the reflection direction control unit 120 determines that the reflection direction in which the communication quality for the communication target is equal to or higher than a reference value is in the range of, for example, 10° to 20°, it sets the reflection direction in which the wireless sensing accuracy for the wireless sensing target area is maximized within the range of 10° to 20° as the reflection direction of the wireless reflector 200 based on the data of the candidate reflection directions of the wireless reflector 200 (e.g., FIG. 9 ).

[0058] When the wireless sensing accuracy in the reflection direction where the wireless sensing accuracy is maximized does not satisfy the reference value of the wireless sensing accuracy, the communication quality for the communication target may be allowed to be lowered. For example, the reflection direction control unit 120 sets the reflection direction where the wireless sensing accuracy for the wireless sensing target area is maximized within the range of 5° to 25° as the reflection direction of the wireless reflector 200.

[0059] (More examples) As described above, the wireless reflector 200 may be an IRS or a metal reflector that mechanically controls the reflection direction.

[0060] In addition, in the above-described embodiment, a case has been described in which one wireless reflector 200 is provided, but the number of wireless reflectors 200 is not limited to one, and the number of wireless reflectors 200 may be multiple.

[0061] In the process flow of the control phase in the first and second embodiments, the reflection direction control unit 120 may set the reflection direction once and then reset the reflection direction depending on the state of communication or wireless sensing.

[0062] Furthermore, when a plurality of different reflection directions can be set simultaneously for the wireless reflector 200, a plurality of reflection directions derived in advance may be set for the wireless reflector 200 in the process flows of the control phase of the first and second embodiments.

[0063] (Hardware configuration example) Any of the devices described in this embodiment (reflection direction derivation control device 100, reflection direction derivation device 300, reflection direction control device 400) can be realized by, for example, causing a computer to execute a program. This computer may be a physical computer or a virtual machine on the cloud.

[0064] That is, the device can be realized by executing a program corresponding to the processing performed by the device, using hardware resources such as a CPU and memory built into a computer. The program can be recorded on a computer-readable recording medium (such as a portable memory) and stored or distributed. The program can also be provided via a network such as the Internet or email.

[0065] Fig. 11 is a diagram showing an example of the hardware configuration of the computer. The computer in Fig. 11 includes a drive device 1000, an auxiliary storage device 1002, a memory device 1003, a CPU 1004, an interface device 1005, a display device 1006, an input device 1007, an output device 1008, and the like, all of which are connected to one another via a bus B. The computer may further include a GPU.

[0066] The program for realizing the processing on the computer is provided by a recording medium 1001 such as a CD-ROM or a memory card. When the recording medium 1001 storing the program is set in the drive device 1000, the program is installed from the recording medium 1001 to the auxiliary storage device 1002 via the drive device 1000. However, the program does not necessarily have to be installed from the recording medium 1001, but may be downloaded from another computer via a network. The auxiliary storage device 1002 stores the installed program as well as necessary files, data, etc.

[0067] The memory device 1003 reads out and stores the program from the auxiliary storage device 1002 when an instruction to start the program is received. The CPU 1004 realizes the functions related to the device in accordance with the program stored in the memory device 1003. The interface device 1005 is used as an interface for connecting to a network, etc. The display device 1006 displays a GUI (Graphical User Interface) or the like according to a program. The input device 1007 is composed of a keyboard and mouse, buttons, a touch panel, etc., and is used to input various operation instructions. The output device 1008 outputs the results of calculations.

[0068] (Effects of the embodiment) The technology according to the present embodiment makes it possible to improve the communication area and communication quality during communication, and to expand the wireless sensing target area and improve the wireless sensing accuracy during wireless sensing, all by using the same wireless reflector.

[0069] The following supplementary notes are further disclosed regarding the above embodiment.

[0070] <Additional Notes> (Additional note 1) A reflection direction control device for controlling the reflection direction of a wireless reflector, Memory, at least one processor coupled to the memory; Including, The memory stores a reflection direction of the wireless reflector for each area in which a wireless sensing object is present, The processor, When the wireless reflector is used for communication, the reflection direction of the wireless reflector is set to a reflection direction for communication use, and when the wireless reflector is used for wireless sensing of an object present in a specific area, the reflection direction corresponding to the specific area is obtained from the memory, and the reflection direction of the wireless reflector is set to the reflection direction corresponding to the specific area. Reflective direction control device. (Additional note 2) The memory stores a plurality of reflection directions of the wireless reflector for each area in which a wireless sensing object is present; When the wireless reflector is used for both communication and wireless sensing of an object present in the specific area, the processor obtains from the memory a reflection direction in which communication quality for the communication object is equal to or higher than a reference value and wireless sensing accuracy for the specific area is equal to or higher than a reference value, and sets the reflection direction of the wireless reflector to the reflection direction obtained from the memory. The reflection direction control device according to claim 1. (Additional note 3) The processor, Derive a reflection direction of the wireless reflector for each area in which the wireless sensing object is present based on a received signal quality at the receiver collected in an environment including a transmitter, the wireless reflector, the wireless sensing object, and a receiver. 3. The reflection direction control device according to claim 1 or 2. (Additional note 4) A reflection direction control method implemented by a reflection direction control device that controls the reflection direction of a wireless reflector, comprising: the reflection direction control device includes a storage unit that stores the reflection direction of the wireless reflector for each area in which a wireless sensing target exists, When the wireless reflector is used for communication, the reflection direction of the wireless reflector is set to a reflection direction for communication use, and when the wireless reflector is used for wireless sensing of an object present in a specific area, the reflection direction corresponding to the specific area is obtained from the storage unit, and the reflection direction of the wireless reflector is set to the reflection direction corresponding to the specific area. Reflective direction control method. (Additional note 5) A non-transitory storage medium storing a program for causing a computer to function as each part of the reflection direction control device described in any one of appended claims 1 to 3.

[0071] Although the present embodiment has been described above, the present invention is not limited to such a specific embodiment, and various modifications and variations are possible within the scope of the gist of the present invention described in the claims. [Explanation of symbols]

[0072] 100 Reflection direction derivation control device 110 Reflection direction derivation part 120 Reflection direction control unit 130 Storage section 140 Communications Department 200 Radio Reflector 300 Reflection direction derivation device 400 Reflection Direction Control Device 1000 Drive Device 1001 Recording media 1002 Auxiliary storage 1003 Memory device 1004 CPU 1005 Interface device 1006 Display device 1007 Input Device 1008 Output device

Claims

1. A reflection direction control device for controlling the reflection direction of a wireless reflector, a storage unit that stores the reflection direction of the wireless reflector for each area in which a wireless sensing target object exists; a reflection direction control unit that, when the wireless reflector is used for communication, sets the reflection direction of the wireless reflector to a reflection direction for communication use, and, when the wireless reflector is used for wireless sensing of an object present in a specific area, acquires a reflection direction corresponding to the specific area from the storage unit and sets the reflection direction of the wireless reflector to the reflection direction corresponding to the specific area; A reflective direction control device comprising:

2. the storage unit stores a plurality of reflection directions of the wireless reflector for each area in which a wireless sensing object exists; When the wireless reflector is used for both communication and wireless sensing of an object present in the specific area, the reflection direction control unit acquires from the storage unit a reflection direction in which communication quality for the communication object is equal to or higher than a reference value and wireless sensing accuracy for the specific area is equal to or higher than a reference value, and sets the reflection direction of the wireless reflector to the reflection direction acquired from the storage unit. The reflective direction control device according to claim 1 .

3. The reflection direction control device further includes a reflection direction derivation unit, The reflection direction deriving unit derives a reflection direction of the wireless reflector for each area in which the wireless sensing object exists, based on a received signal quality at the receiver collected in an environment including a transmitter, the wireless reflector, the wireless sensing object, and a receiver. The reflective direction control device according to claim 1 .

4. A reflection direction control method implemented by a reflection direction control device that controls the reflection direction of a wireless reflector, comprising: the reflection direction control device includes a storage unit that stores the reflection direction of the wireless reflector for each area in which a wireless sensing target exists, When the wireless reflector is used for communication, the reflection direction of the wireless reflector is set to a reflection direction for communication use, and when the wireless reflector is used for wireless sensing of an object present in a specific area, the reflection direction corresponding to the specific area is obtained from the storage unit, and the reflection direction of the wireless reflector is set to the reflection direction corresponding to the specific area. Reflective direction control method.

5. A program for causing a computer to function as each unit in the reflection direction control device according to any one of claims 1 to 3.

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