Propagation characteristic estimation device, propagation characteristic estimation method, and propagation characteristic estimation program

Abstract

This propagation characteristic estimation device estimates radio wave propagation characteristics between a transmission point and a reception point. Environment information indicates an arrangement of a structure surface that reflects and scatters radio waves from the transmission point to the reception point. The propagation characteristic estimation device extracts, on the basis of the environment information and as a target structure surface, a structure surface that is visible without obstruction from both the transmission point and the reception point. The propagation characteristic estimation device estimates the radio wave propagation characteristics of a propagation path between the transmission point and the reception point via the target structure surface, on the basis of: a first area that is an area of the target structure surface visible from the transmission point; a second area that is an area of the target structure surface visible from the reception point; and a reflection pattern that represents a level of a reflection wave reflected by the target structure surface. When the target structure surface is the reflection surface of a dynamic reflection plate, the propagation characteristic estimation device estimates the radio wave propagation characteristics on the basis of the reflection pattern corresponding to a setting value of a reflection angle of the dynamic reflection plate.

Description

Propagation characteristic estimation device, propagation characteristic estimation method, and propagation characteristic estimation program

[0001] The present invention relates to a technique for estimating radio wave propagation characteristics between a transmitting point and a receiving point.

[0002] Non-Patent Document 1 discloses a ray tracing method, which is a method for estimating radio wave propagation characteristics in a wireless communication system.

[0003] T. Imai, "Mobile Propagation Simulation Using Ray Tracing Method," IEICE Transactions on Wireless Communication (B), Vol. J92-B, No. 9, pp. 1333-1347, Sept. 2009.

[0004] The color image method is a method for estimating radio wave propagation characteristics in wireless communication systems. According to the color image method, color images of the surface of a structure as seen from the transmitting and receiving points are created. Furthermore, the propagation paths of scattered waves are simultaneously searched based on the color images. This allows radio wave propagation characteristics such as propagation loss and received power to be estimated quickly and accurately.

[0005] However, existing color image methods only consider the scattering characteristics of structural surfaces. Existing color image methods do not consider the characteristics of dynamic reflectors (RIS: Reconfigurable Intelligent Surfaces), which can "intentionally" control the reflection direction. A technology that can estimate radio wave propagation characteristics while also considering the characteristics of dynamic reflectors is desired.

[0006] A first aspect relates to a propagation characteristic estimation device that estimates radio wave propagation characteristics between a transmission point and a reception point. The propagation characteristic estimation device includes one or more processors and one or more storage devices that store environmental information indicating the arrangement of structural surfaces that reflect and scatter radio waves from the transmission point to the reception point. The one or more processors extract, as target structural surfaces, structural surfaces that are visible from both the transmission point and the reception point based on the environmental information. The one or more processors estimate radio wave propagation characteristics of a propagation path between the transmission point and the reception point that passes through the target structural surface based on a first area that is the area of ​​the target structural surface visible from the transmission point, a second area that is the area of ​​the target structural surface visible from the reception point, and a reflection pattern that indicates the level of waves reflected by the target structural surface. If the target structural surface is a reflecting surface of a dynamic reflector, the one or more processors estimate the radio wave propagation characteristics based on a reflection pattern that corresponds to a setting value of the reflection angle of the dynamic reflector.

[0007] A second aspect relates to a propagation characteristic estimation method for estimating radio wave propagation characteristics between a transmission point and a reception point, the propagation characteristic estimation method including: acquiring environmental information indicating the arrangement of structural surfaces that reflect and scatter radio waves from the transmission point to the reception point; extracting, based on the environmental information, structural surfaces that are visible from both the transmission point and the reception point as target structural surfaces; and estimating radio wave propagation characteristics of a propagation path between the transmission point and the reception point via the target structural surface based on a first area that is the area of ​​the target structural surface visible from the transmission point, a second area that is the area of ​​the target structural surface visible from the reception point, and a reflection pattern that indicates the level of waves reflected by the target structural surface. When the target structural surface is a reflecting surface of a dynamic reflector, estimating the radio wave propagation characteristics includes estimating the radio wave propagation characteristics based on a reflection pattern according to a setting value of the reflection angle of the dynamic reflector.

[0008] A third aspect relates to a propagation characteristic estimation program for estimating radio wave propagation characteristics between a transmission point and a reception point. The propagation characteristic estimation program is executed by a computer. The propagation characteristic estimation program causes the computer to: acquire environmental information indicating the arrangement of structural surfaces that reflect and scatter radio waves from the transmission point to the reception point; extract, based on the environmental information, structural surfaces that are visible from both the transmission point and the reception point as target structural surfaces; and estimate radio wave propagation characteristics of a propagation path between the transmission point and the reception point via the target structural surface based on a first area that is the area of ​​the target structural surface visible from the transmission point, a second area that is the area of ​​the target structural surface visible from the reception point, and a reflection pattern that indicates the level of waves reflected by the target structural surface. When the target structural surface is a reflecting surface of a dynamic reflector, estimating the radio wave propagation characteristics includes estimating the radio wave propagation characteristics based on a reflection pattern corresponding to a setting value of the reflection angle of the dynamic reflector.

[0009] According to the present invention, it is possible to estimate radio wave propagation characteristics taking into consideration the characteristics of a dynamic reflector whose reflection direction is intentionally controlled.

[0010] 1 is a schematic diagram showing a wireless communication system. FIG. 2 is a block diagram showing an example of the configuration of a propagation characteristic estimation device. FIG. 3 is a block diagram showing an example of the functional configuration related to the color image method. FIG. 4 is a flowchart showing propagation characteristic estimation processing using the color image method. FIG. 5 is a conceptual diagram for explaining the creation of a color image. FIG. 6 is a diagram showing an example of a color image. FIG. 7 is a diagram for explaining a transmission point, a reception point, and a target structure surface. FIG. 8 is a conceptual diagram for explaining a reflection pattern in the case of a dynamic reflector. FIG. 9 is a flowchart showing path gain calculation processing (step S140).

[0011] An embodiment of the present invention will be described with reference to the accompanying drawings.

[0012] 1. Overview of the Propagation Characteristics Estimation Device Fig. 1 is a schematic diagram showing a wireless communication system 1. The wireless communication system 1 includes a transmission point Tx that transmits radio waves and a reception point Rx that receives radio waves. Because radio waves are reflected and scattered by buildings and the like, multiple propagation paths exist between the transmission point Tx and the reception point Rx.

[0013] An object that affects radio wave propagation from a transmitting point Tx to a receiving point Rx will be referred to hereinafter as a "structure 10." Examples of the structure 10 include a building, a wall, and the like. Typically, a large number of structures 10 exist in a radio wave transmission area that includes the transmitting point Tx and the receiving point Rx. Radio waves are reflected and scattered by the surfaces of the structures 10. A surface of the structure 10 that reflects and scatters radio waves will be referred to hereinafter as a "structure surface 11." For example, the structure surface 11 is the wall surface of a building. When one structure 10 has multiple structure surfaces 11 (e.g., 11a to 11d), these multiple structure surfaces 11 are distinguished from one another.

[0014] According to this embodiment, radio wave propagation characteristics are estimated in the wireless communication system 1, i.e., radio wave propagation characteristics between a transmitting point Tx and a receiving point Rx. In particular, the radio wave propagation characteristics between the transmitting point Tx and the receiving point Rx are estimated taking into consideration reflection and scattering of radio waves on the structure surface 11. Examples of radio wave propagation characteristics include propagation loss, radio wave intensity of the received wave, received power, and delay time.

[0015] 2 is a block diagram showing an example configuration of a propagation characteristic estimation device 100 that estimates radio wave propagation characteristics between a transmission point Tx and a reception point Rx. The propagation characteristic estimation device 100 is a computer including one or more processors 101 (hereinafter simply referred to as "processors 101") and one or more storage devices 102 (hereinafter simply referred to as "storage devices 102"). The processor 101 executes various processes. Examples of the processor 101 include a central processing unit (CPU), an application specific integrated circuit (ASIC), and a field-programmable gate array (FPGA). The storage device 102 stores various information. Examples of the storage device 102 include a hard disk drive (HDD), a solid state drive (SSD), a volatile memory, and a nonvolatile memory.

[0016] The propagation characteristics estimation program 103 is a computer program (software) executed by the processor 101. The functions of the propagation characteristics estimation apparatus 100 may be realized by cooperation between the processor 101 executing the propagation characteristics estimation program 103 and the storage device 102. The propagation characteristics estimation program 103 is stored in the storage device 102. The propagation characteristics estimation program 103 may be recorded on a computer-readable recording medium. The propagation characteristics estimation program 103 may be provided via a network.

[0017] The environmental information 104 is information necessary for estimating radio wave propagation characteristics in the wireless communication system 1. For example, the environmental information 104 includes position information of a transmission point Tx and position information of a reception point Rx. The environmental information 104 also includes structure information indicating the arrangement of structures 10 that affect radio wave propagation from the transmission point Tx to the reception point Rx. The structure information includes the arrangement (position, orientation, size), reflection coefficient, etc. of each structure surface 11 of each structure 10. The structure information may be provided in the form of three-dimensional computer-aided design (CAD) data, building information modeling (BIM) data, etc. The environmental information 104 may also include information on the wavelength of radio waves used in the wireless communication system 1. The environmental information 104 is stored in the storage device 102.

[0018] The propagation characteristics estimation apparatus 100 may further include a communication interface 105 for communicating with the outside. The environment information 104 may be provided to the propagation characteristics estimation apparatus 100 via the communication interface 105.

[0019] The propagation characteristics estimation apparatus 100 may further include a user interface 106 that accepts input from a user and presents various information to the user. The user interface 106 includes an input device and a display device. Examples of the input device include a keyboard, a mouse, and a touch panel. The user can operate the propagation characteristics estimation apparatus 100 by using the input device. The estimated results of the radio wave propagation characteristics are displayed on the display device.

[0020] The "color image method" is one method for estimating radio wave propagation characteristics in the wireless communication system 1. The color image method can estimate radio wave propagation characteristics quickly and with high accuracy. The color image method will be described in detail below.

[0021] Fig. 3 is a block diagram showing an example of a functional configuration related to the color image method. The propagation characteristics estimation apparatus 100 includes, as functional blocks, a structure surface information creation unit 110, a color image creation unit 120, a structure surface extraction unit 130, a path gain calculation unit 140, and a received power calculation unit 150. These functional blocks may be realized by cooperation between a processor 101 that executes a propagation characteristics estimation program 103 and a storage device 102. Fig. 4 is a flowchart showing a propagation characteristics estimation process using the color image method.

[0022] 1-1. Structure surface information creation process (step S110) In step S110, the structure surface information creation unit 110 recognizes each structure surface 11 of each structure 10 based on the environmental information 104. When one structure 10 has multiple structure surfaces 11 (e.g., 11a to 11d), these multiple structure surfaces 11 are distinguished from one another (see FIG. 1). Then, the structure surface information creation unit 110 assigns identification information to each structure surface 11. The identification information is different for each structure surface 11.

[0023] For example, the identification information of the structure surface 11 is "color." In this case, the structure surface information creation unit 110 assigns a different color to each structure surface 11. The color is expressed, for example, by RGB values. For example, the RGB values ​​assigned to the structure surface 11 are (R, G, B) = (10 to 249, 10 to 249, 10 to 249). Special colors (0, 0, 0) and (255, 255, 255) are assigned to the background and the ground.

[0024] The structure surface information is information relating to each structure surface 11. Specifically, the structure surface information includes identification information (color), arrangement (position, orientation, size), reflection coefficient, etc. of each structure surface 11. The position, orientation, size, reflection coefficient, etc. of each structure surface 11 are registered in advance in the environment information 104. The structure surface information creation unit 110 creates the structure surface information and adds the structure surface information to the environment information 104.

[0025] The identification information of the structure surface 11 may be an identification number. In the following description, a case will be described in which the identification information of the structure surface 11 is a color. The color representation format is not limited to RGB.

[0026] 1-2. Color Image Creation Process (Step S120) In step S120, the color image creation unit 120 creates a two-dimensional image of the structure surface 11 as seen from each of the transmission point Tx and the reception point Rx. If a unique color is assigned to each structure surface 11, the two-dimensional image becomes a two-dimensional color image. Hereinafter, this two-dimensional color image will be simply referred to as a "color image."

[0027] FIG. 5 is a conceptual diagram for explaining the creation of a color image. In FIG. 5, the viewpoint is the transmitting point Tx or the receiving point Rx. The line of sight direction is the direction from the viewpoint to the structure surface 11. For example, the line of sight direction is the direction from the viewpoint to the center point of the structure surface 11. The angle θ is the angle between the line of sight direction and the normal direction of the structure surface 11. It can also be said that the angle θ is the direction of the viewpoint (transmitting point Tx or receiving point Rx) as seen from the structure surface 11. The distance d is the distance between the viewpoint and the structure surface 11 along the line of sight direction. The color image creation unit 120 projects the structure surface 11 onto a unit sphere centered on the viewpoint. If the area of ​​the original structure surface 11 is S, the area S' of the structure surface 11 projected onto the unit sphere is S·cos θ / d ２ It is expressed as:

[0028] The color image creation unit 120 projects all of the structure surfaces 11 seen from the viewpoint onto the same unit sphere. Although the line of sight direction and distance d may differ for each structure surface 11, all of the structure surfaces 11 are projected onto the same unit sphere. The color image creation unit 120 then unfolds the unit sphere onto a plane. This allows a color image of the structure surface 11 seen from the viewpoint to be obtained.

[0029] 6 shows an example of a color image viewed from a transmitting point Tx and a color image viewed from a receiving point Rx. In the color image, each structure surface 11 is represented by a unique color assigned to each structure surface 11. The color image is generated taking occlusion into consideration.

[0030] As described above, the environment information 104 includes the position information of the transmission point Tx, the position information of the reception point Rx, and the structure surface information (the color, position, orientation, and size of each structure surface 11). Therefore, the color image creation unit 120 can create a color image seen from the transmission point Tx and a color image seen from the reception point Rx based on the environment information 104. The created color images are stored in the storage device 102.

[0031] 1-3. Structural Surface Extraction Process (Step S130) In the color image method, a propagation path that reaches the receiving point Rx from the transmitting point Tx with only one scattering and reflection is considered. In other words, the dominant single-scattered wave (reflected wave) is considered. For this reason, the structural surface 11 that is visible from both the transmitting point Tx and the receiving point Rx is extracted.

[0032] In step S130, the structure surface extraction unit 130 extracts structure surfaces 11 that are visible from both the transmission point Tx and the reception point Rx. Specifically, the structure surface extraction unit 130 compares the color image seen from the transmission point Tx with the color image seen from the reception point Rx, and extracts structure surfaces 11 that have the same color in the two color images. The structure surfaces 11 that have the same color in the two color images are structure surfaces 11 that are visible from both the transmission point Tx and the reception point Rx. The structure surfaces 11 that are visible from both the transmission point Tx and the reception point Rx will be referred to as the "target structure surface 11X" hereinafter.

[0033] By comparing the color image seen from the transmitting point Tx with the color image seen from the receiving point Rx, it is possible to simultaneously search for one or more target structure surfaces 11X. In other words, it is possible to simultaneously search for one or more propagation paths from the transmitting point Tx to the receiving point Rx. The ability to simultaneously search for propagation paths in this way contributes to speeding up the radio wave propagation characteristics.

[0034] 1-4. Path Gain Calculation Process (Step S140) In step S140, the path gain calculation unit 140 calculates the path gain of the propagation path between the transmission point Tx and the reception point Rx that passes through the target structure surface 11X. That is, the path gain calculation unit 140 calculates the path gain of the propagation path that is reflected and scattered at the target structure surface 11X.

[0035] 7 shows the transmission point Tx, the reception point Rx, and the target structure surface 11X. Ｔ is an angle θ that represents the direction of the transmission point Tx as seen from the target structure surface 11X. The first distance d1 is the distance d between the transmission point Tx and the target structure surface 11X. The second angle θ Ｒ is the angle θ representing the direction of the receiving point Rx as seen from the target structure surface 11X. The second distance d2 is the distance d between the receiving point Rx and the target structure surface 11X. The area of ​​the target structure surface 11X is S. The first area S1 is the area of ​​the target structure surface 11X seen from the transmitting point Tx. The second area S2 is the area of ​​the target structure surface 11X seen from the receiving point Rx. As shown in FIG. 5, the area S' of the structure surface 11 projected onto the unit sphere is S·cos θ / d ２ Therefore, the first area S1′ and the second area S2′ of the target structure surface 11X projected onto the unit sphere are respectively expressed by the following formulas (1) and (2).

[0036]

[0037]

[0038] The path gain PG of the propagation path that is reflected and scattered by the target structure surface 11X depends on the first area S1' and the second area S2'. Specifically, the path gain PG of the propagation path that is reflected and scattered by the target structure surface 11X is expressed by the following equations (3) to (5). Note that "i" in the equations is an identifier of the target structure surface 11X and is different for each target structure surface 11X.

[0039]

[0040]

[0041]

[0042] C represented by formula (4) Γ is a parameter corresponding to the reflection loss Γ of the target structure surface 11X. ｂ is a reflection pattern that indicates the level of the reflected wave (scattered wave) by the target structure surface 11X. FIG. 7 also shows the formula for the bistatic scattering cross section σ of the flat plate. Reflection pattern Cｂ is also included in the formula for the bistatic scattering cross section σ, and the first angle θ Ｔ and the second angle θ Ｒ It is expressed as a sinc function with the parameter

[0043] In this way, the path gain PG depends on the multiplication of the first area S1′ and the second area S2′. Also, the path gain PG depends on the reflection pattern C of the target structure surface 11X. ｂ Depends on.

[0044] The first area S1' and the second area S2' can also be replaced with the number of pixels on the color image. Ｐ，Ｔ is the number of pixels on the color image of the target structure surface 11X as seen from the transmission point Tx. Ｐ，Ｒ is the number of pixels on the color image of the target structure surface 11X as seen from the receiving point Rx. In this case, equation (3) is replaced by the following equations (6) and (7).

[0045]

[0046]

[0047] 4π / (H × W) in equation (7) is the area per pixel. The color image creation unit 120 develops the unit sphere onto a plane, and H × W represents the total number of pixels on the plane.

[0048] As described above, the environment information 104 includes the position information of the transmission point Tx, the position information of the reception point Rx, and the structure surface information (the color, position, orientation, and size of each structure surface 11). Therefore, the path gain calculation unit 140 can calculate the path gain PG based on the environment information 104 and the above formula. When formula (6) is used, the path gain calculation unit 140 calculates the first number of pixels N in the color image. Ｐ，Ｔ and the second pixel number N Ｐ，Ｒ The path gain calculation unit 140 calculates the path gain PG for all the target structure surfaces 11X (propagation paths).

[0049] 1-5. Received Power Calculation Process (Step S150) In step S150, the received power calculation unit 150 calculates the received power (strength of the received radio wave) at the reception point Rx. Specifically, the received power calculation unit 150 calculates the sum of the path gains for all the target structure surfaces 11X to calculate the received power. In other words, the received power calculation unit 150 combines the path gains for all the target structure surfaces 11X to calculate the received power.

[0050] 2. Color image method taking into account dynamic reflectors Dynamic reflectors (RIS: Reconfigurable Intelligent Surface) are known for use in wireless communications. Dynamic reflectors are composed of numerous reflective elements and reflect incident radio waves. The reflection characteristics of a dynamic reflector, such as the reflection direction, can be dynamically controlled. For example, a dynamic reflector is a metasurface reflector. By using a dynamic reflector, it is possible to form a propagation path that bypasses obstacles or form multiple propagation paths for a single terminal device. This makes it possible to improve communication performance, such as communication quality and spatial multiplexing number.

[0051] The existing color image method only considers the scattering characteristics of the structure surface 11. The existing color image method does not consider the characteristics of dynamic reflectors whose reflection direction can be "intentionally" controlled. Therefore, this embodiment proposes a technology for estimating radio wave propagation characteristics using the color image method while also considering the characteristics of dynamic reflectors.

[0052] According to this embodiment, when the target structure surface 11X is a reflecting surface of a dynamic reflector, the reflection pattern C for calculating the path gain PG is ｂ is corrected to correspond to the set value of the reflection angle of the dynamic reflector. Then, the reflection pattern C ｂ Based on this, the radio wave propagation characteristics are estimated.

[0053] 8 and 9 show the reflection pattern C in the case of a dynamic reflector. ｂ 1 is a conceptual diagram for explaining a reflection pattern C. ｂrepresents the level of the reflected wave (scattered wave) from the reflecting surface of the dynamic reflector. Ｔ is an angle representing the direction of the transmission point Tx as seen from the reflecting surface of the dynamic reflector. Ｒ is an angle representing the direction of the receiving point Rx as seen from the reflecting surface of the dynamic reflector. Ｒｉｓ is the set value of the reflection angle of the dynamic reflector. In FIGS. 8 and 9, the horizontal axis represents the second angle θ Ｒ The vertical axis represents the level of the reflected wave (scattered wave) from the reflecting surface of the dynamic reflector.

[0054] In FIG. 8, the first angle θ Ｔ and the set reflection angle θ Ｒｉｓ is the same. ｂ and the first angle θ Ｔ and the set reflection angle θ Ｒｉｓ Reflection pattern C when ｂ FIG. 9 shows various set reflection angles θ Ｒｉｓ Reflection pattern C for ｂ As shown in Figs. 8 and 9, the reflection pattern C ｂ is the first angle θ Ｔ and the set reflection angle θ Ｒｉｓ Therefore, the reflection pattern C in the case of a dynamic reflector ｂ is the first angle θ Ｔ and the second angle θ Ｒ and the set reflection angle θ Ｒｉｓ It is expressed as a function of

[0055] Reflection pattern C shown in FIGS. 8 and 9 ｂ By using the above equation, the path gain PG in the case of a dynamic reflector is expressed by the following equation (8).

[0056]

[0057] An additional loss η may be added to the path gain PG for the dynamic reflector, as shown in equation (8). The additional loss η may be predetermined.

[0058] In FIG. Ｒ = θ Ｒｉｓ Various setting reflection angles θ ＲｉｓReflection pattern C for ｂ A function that approximately represents the value of is also shown. The reflection pattern C for a dynamic reflector ｂ is approximately expressed by the following equation (9).

[0059]

[0060] When the target structure surface 11X is a reflecting surface of a dynamic reflector, the path gain calculation unit 140 calculates the path gain PG based on the above formula (8). More specifically, the environment information 104 also includes information about the dynamic reflector. The information about the dynamic reflector includes a flag indicating that it is a dynamic reflector, a set reflection angle θ of the dynamic reflector, Ｒｉｓ , the reflection pattern C of the dynamic reflector ｂ (see FIGS. 8 and 9), additional loss η, etc. The path gain calculation unit 140 calculates the path gain PG based on the environment information 104 when the target structure surface 11X is the reflecting surface of a dynamic reflector.

[0061] 10 is a flowchart showing the path gain calculation process (step S140) according to this embodiment. In step S141, the path gain calculation unit 140 determines whether the target structure surface 11X is a reflecting surface of a dynamic reflector, based on the environment information 104.

[0062] If the target structural surface 11X is the reflecting surface of a dynamic reflector (step S141; Yes), the process proceeds to step S142. In step S142, the path gain calculation unit 140 calculates the path gain PG based on the above formula (8).

[0063] On the other hand, if the target structure surface 11X is not a reflecting surface of a dynamic reflector (step S141; No), the process proceeds to step S143. In step S143, the path gain calculation unit 140 calculates the path gain PG based on the above formula (6).

[0064] As described above, according to this embodiment, it is possible to calculate the path gain PG taking into consideration the characteristics of a dynamic reflector whose reflection direction is intentionally controlled. In other words, it is possible to take into consideration the characteristics of a dynamic reflector in the color image method. In other words, it is possible to quickly estimate the radio wave propagation characteristics taking into consideration the characteristics of the dynamic reflector.

[0065] REFERENCE SIGNS LIST 1... wireless communication system, 10... structure, 11... structure surface, 11X... target structure surface, 100... propagation characteristic estimation device, 101... processor, 102... storage device, 103... propagation characteristic estimation program, 104... environment information, 105... communication interface, 106... user interface, 110... structure surface information creation unit, 120... color image creation unit, 130... structure surface extraction unit, 140... path gain calculation unit, 150... received power calculation unit

Claims

1. A propagation characteristic estimation device for estimating radio wave propagation characteristics between a transmission point and a reception point, comprising: one or more processors; and one or more storage devices for storing environmental information indicating the arrangement of structural surfaces that reflect and scatter radio waves from the transmission point to the reception point, wherein the one or more processors are configured to: extract the structural surface that is visible from both the transmission point and the reception point as a target structural surface based on the environmental information; and estimate the radio wave propagation characteristics of the propagation path between the transmission point and the reception point via the target structural surface based on a first area that is the area of ​​the target structural surface visible from the transmission point, a second area that is the area of ​​the target structural surface visible from the reception point, and a reflection pattern that indicates the level of reflected waves by the target structural surface; and when the target structural surface is the reflection surface of a dynamic reflector, the one or more processors estimate the radio wave propagation characteristics based on the reflection pattern that corresponds to a setting value of the reflection angle of the dynamic reflector.

2. The propagation characteristic estimation device according to claim 1, Ｔ is an angle representing the direction of the transmission point as seen from the reflecting surface of the dynamic reflector, and θ Ｒ is an angle representing the direction of the receiving point as seen from the reflecting surface of the dynamic reflector, and θ Ｒｉｓ is the set value of the reflection angle of the dynamic reflector, and the reflection pattern according to the set value of the reflection angle of the dynamic reflector is expressed as θ Ｔ , θ Ｒ , and θ Ｒｉｓ A propagation characteristic estimation device expressed as a function of.

3. A propagation characteristic estimation device according to claim 2, wherein the reflection pattern according to the setting value of the reflection angle of the dynamic reflector is approximately expressed as cos(θ Ｒｉｓ -θ Ｔ ) is a propagation characteristic estimation device.

4. A propagation characteristic estimation device according to any one of claims 1 to 3, wherein the one or more processors calculate a path gain of the propagation path between the transmitting point and the receiving point via the target structure surface based on the first area, the second area and the reflection pattern, and estimate the radio wave propagation characteristics based on the path gain.

5. A propagation characteristic estimation device according to claim 4, wherein, when the target structure surface is the reflecting surface of the dynamic reflector, the one or more processors add an additional loss to the path gain.

6. A propagation characteristic estimation method for estimating radio wave propagation characteristics between a transmission point and a reception point, comprising: acquiring environmental information indicating the arrangement of structural surfaces that reflect and scatter radio waves from the transmission point to the reception point; extracting the structural surfaces that are visible from both the transmission point and the reception point as target structural surfaces based on the environmental information; estimating the radio wave propagation characteristics of the propagation path between the transmission point and the reception point via the target structural surface based on a first area that is the area of ​​the target structural surface visible from the transmission point, a second area that is the area of ​​the target structural surface visible from the reception point, and a reflection pattern that indicates the level of the reflected wave by the target structural surface, wherein estimating the radio wave propagation characteristics includes, when the target structural surface is the reflection surface of a dynamic reflector, estimating the radio wave propagation characteristics based on the reflection pattern according to a set value of the reflection angle of the dynamic reflector.

7. A propagation characteristic estimation program for estimating radio wave propagation characteristics between a transmission point and a reception point, the propagation characteristic estimation program being executed by a computer and causing the computer to execute the following: acquire environmental information indicating the arrangement of structural surfaces that reflect and scatter radio waves from the transmission point to the reception point; extract the structural surfaces that are visible from both the transmission point and the reception point as target structural surfaces based on the environmental information; and estimate the radio wave propagation characteristics of the propagation path between the transmission point and the reception point via the target structural surface based on a first area that is the area of ​​the target structural surface visible from the transmission point, a second area that is the area of ​​the target structural surface visible from the reception point, and a reflection pattern that indicates the level of the reflected wave by the target structural surface; and estimating the radio wave propagation characteristics includes, when the target structural surface is the reflecting surface of a dynamic reflector, estimating the radio wave propagation characteristics based on the reflection pattern that corresponds to a setting value of the reflection angle of the dynamic reflector.

Images