COMMUNICATION SYSTEM, ANTENNA INSTALLATION HEIGHT DETERMINATION METHOD, AND MANAGEMENT DEVICE

Abstract

To provide a communication system capable of determining the installation height of an antenna of a piece of radio device of a receiver that is capable of appropriately suppressing deterioration of reception quality due to interference caused by reflected waves or the like from the ground or the like.SOLUTION: The communication system includes: a first radio device; a second radio device that receives radio waves transmitted from the first radio device; and a management device. The management device is configured to determine the adjustment value of the installation height of the antenna based on the reception quality of each sector by beamforming in the antenna included in the second radio device and the distance between the first radio device and the second radio device.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present disclosure relates to a communication system, an antenna installation height determination method, and a management device. [Background technology]

[0002] In a communication system in which two wireless devices are arranged opposite each other to transmit and receive radio waves, the receiving wireless device, which is equipped with multiple antennas, adjusts the distance between the antennas to suppress deterioration of reception quality due to interference from reflected waves from the ground, etc.

[0003] Patent document 1 discloses a method of generating candidate values ​​for the distance between antennas at intervals corresponding to the installation height of any one of a number of antennas whose distance between the antennas is adjustable, calculating the communication quality when the distance between the antennas is set to the candidate value, and determining a setting value for the distance between the antennas from among the candidate values ​​based on the communication quality. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2018-207172 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, with the method disclosed in Patent Document 1, it is difficult to determine the installation height of the antenna of the receiving wireless device that can appropriately suppress degradation of reception quality caused by interference such as reflected waves from the ground, etc.

[0006] An object of the present disclosure is to provide a technique for determining the installation height of an antenna of a receiving wireless device, which can appropriately suppress degradation of reception quality due to interference such as reflected waves from the ground, etc. [Means for solving the problem]

[0007] The present disclosure provides a communication system comprising a first radio device, a second radio device that receives radio waves transmitted from the first radio device, and a management device, in which the management device determines an adjustment value for the installation height of the antenna based on reception quality for each sector by beamforming at an antenna provided in the second radio device and the distance between the first radio device and the second radio device.

[0008] The present disclosure provides an antenna installation height determination method for determining an installation height of an antenna of a second radio device that receives radio waves transmitted from a first radio device, the method determining an adjustment value for the installation height of the antenna based on reception quality for each sector by beamforming at the antenna and the distance between the first radio device and the second radio device.

[0009] The present disclosure provides a management device that includes a processor that acquires data indicating the reception quality for each sector by beamforming at an antenna provided in a second radio device that receives radio waves transmitted from a first radio device and data indicating the distance between the first radio device and the second radio device, and outputs an adjustment value for the installation height of the antenna based on the data indicating the reception quality and the data indicating the distance.

[0010] Furthermore, these comprehensive or specific aspects may be realized by a system, an apparatus, a method, an integrated circuit, a computer program, or a recording medium, or may be realized by any combination of a system, an apparatus, a method, an integrated circuit, a computer program, and a recording medium. Effect of the Invention

[0011] According to the present disclosure, it is possible to determine the installation height of the antenna of a receiving wireless device that can appropriately suppress degradation of reception quality due to interference such as reflected waves from the ground, etc. [Brief description of the drawings]

[0012] [Figure 1]FIG. 1 is a conceptual diagram showing an example of installation of a wireless device according to an embodiment of the present invention; [Diagram 2] FIG. 1 is a block diagram showing a configuration example of a communication system according to an embodiment of the present invention. [Diagram 3] FIG. 1 is a conceptual diagram illustrating a receiver sector sweep according to an embodiment of the present invention; [Figure 4] FIG. 1 is a conceptual diagram showing a sector-by-sector SNR pattern obtained by a receiver sector sweep according to the present embodiment. [Diagram 5] FIG. 1 is a diagram for explaining the relationship between a sector-specific SNR pattern and a power distribution pattern according to the present embodiment. [Figure 6] FIG. 1 is a sequence diagram showing an example of an antenna installation process according to an embodiment of the present invention. [Figure 7] FIG. 1 is a conceptual diagram showing an example of installation of a wireless device according to an embodiment of the present invention; [Figure 8] FIG. 13 is a diagram showing an example of notification of an adjustment value of an antenna installation height by a management device according to the present embodiment; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, the embodiments of the present disclosure will be described in detail with reference to the drawings as appropriate. However, more detailed description than necessary may be omitted. For example, detailed description of already well-known matters and duplicated description of substantially the same configuration may be omitted. This is to avoid the following description becoming unnecessarily redundant and to facilitate understanding by those skilled in the art. Note that the accompanying drawings and the following description are provided to enable those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.

[0014] (Present embodiment) <Example of wireless device installation> FIG. 1 is a conceptual diagram showing an example of installation of a wireless device 10 according to the present embodiment. As an example of the wireless device 10, a first wireless device 10A and a second wireless device 10B are illustrated. The first wireless device 10A and the second wireless device 10B are installed by an operator (user) on a wall or a pillar so as to face each other. The first wireless device 10A and the second wireless device 10B facing each other may perform wireless communication by millimeter wave communication. That is, the second wireless device 10B receives radio waves transmitted from the first wireless device 10A. The wireless device 10 may be read as a long-distance wireless device using millimeter waves. Note that the first wireless device 10A and the second wireless device 10B may perform wireless communication using radio waves with a wavelength different from that of millimeter waves.

[0015] For example, the worker installs the first wireless device 10A at a height ht (cm) from the ground. The worker similarly installs the second wireless device 10B. The height of the second wireless device 10B from the ground at the time of the initial installation is assumed to be hr (cm). The distance between the first wireless device 10A and the second wireless device 10B is assumed to be d (cm).

[0016] Here, a part of the radio waves sent from the antenna of the first radio device 10A may be reflected by the ground. Depending on the installation height of the antenna of the second radio device 10B, these reflected waves may interfere with each other and weaken the power, which may weaken the received power at the antenna of the second radio device 10B.

[0017] The worker adjusts the installation height of the antenna of the second radio device 10B so that the antenna is not easily affected by the reflected waves as described above. It is preferable if the adjustment of the installation height can be performed as simply as possible.

[0018] Therefore, in the embodiment of the present disclosure, the management device 20 connected to the second wireless device 10B determines an adjustment value of the installation height for the antenna of the second wireless device 10B. This allows the worker to easily adjust the height of the antenna of the second wireless device 10B based on the adjustment value of the installation height. The adjustment value of the installation height is expressed as Δh in FIG. 1. If Δh is a positive value, the worker moves the antenna of the second wireless device 10B upward. If Δh is a negative value, the worker moves the antenna of the second wireless device 10B further downward.

[0019] The wireless device 10 can perform beamforming. As shown in the figure, the wireless device 10 according to the embodiment of the present disclosure performs beamforming in the up-down direction. The up-down direction here corresponds to the Z-axis direction in the XZ coordinate system shown in FIG.

[0020] <Example of communication system configuration> 2 is a block diagram showing a configuration example of a communication system 1 according to the present embodiment. The communication system 1 includes a first wireless device 10A, a second wireless device 10B that receives radio waves transmitted from the first wireless device 10A, and a management device 20 connected to the second wireless device 10B. Since the first wireless device 10A and the second wireless device 10B have the same configuration, they will be collectively described as a wireless device 10. The wireless device 10 includes a processor 11, a memory 12, a connection interface 13, and a wireless interface 14. In addition, an antenna 15 is connected to the wireless interface 14.

[0021] The processor 11 is configured using, for example, a central processing unit (CPU), a micro processing unit (MPU), a digital signal processor (DSP), or a field programmable gate array (FPGA). The processor 11 performs control processing for overall supervision of the operations of each part of the wireless device 10.

[0022] The memory 12 may include a read-only memory (ROM), a random access memory (RAM), a flash memory, or the like, and stores various programs executed by the processor 11 and various data.

[0023] The connection interface 13 is an interface for establishing a communication connection with an external device such as a management device 20 described below. The connection interface 13 includes a communication circuit compatible with wired communication or wireless communication. Examples of the connection interface 13 in the case of wired communication include a Universal Serial Bus (USB) interface or Ethernet (registered trademark). Examples of the connection interface 13 in the case of wireless communication include a Wi-Fi communication interface or a Bluetooth communication interface.

[0024] The wireless interface 14 is an interface capable of performing wireless communication with other wireless devices via an antenna 15. The wireless interface 14 includes a communication circuit compatible with wireless communication.

[0025] The antenna 15 is an antenna capable of wireless communication using a directional beam. The wireless communication using a directional beam includes millimeter wave communication. The antenna 15 may be an array antenna having a plurality of antenna elements.

[0026] The management device 20 is an example of an information processing device, such as a smartphone, a tablet, or a personal computer. The management device 20 may be a device different from these. The management device 20 may be integrated with the second wireless device 10B.

[0027] The management device 20 includes a processor 21 , a memory 22 , a connection interface 23 , an operation device 24 , and a display device 25 .

[0028] The processor 21 is configured using, for example, a CPU, a GPU (Graphics Processing Unit), an MPU, a DSP, or an FPGA. The processor 21 performs control processing for overall supervising the operation of each part of the management device 20.

[0029] The memory 22 may include a ROM, a RAM, a flash memory, or the like, and stores various programs and various data executed by the processor 21. The memory 22 stores a height adjustment program, which will be described later with reference to Fig. 6. The memory 22 stores a trained model 221 configured by a neural network.

[0030] The connection interface 23 is an interface for communicating with an external device such as the wireless device 10. The connection interface 23 includes a communication circuit for wired communication or wireless communication. Examples of the connection interface 23 in the case of wired communication include a USB interface or Ethernet. Examples of the connection interface 13 in the case of wireless communication include a Wi-Fi communication interface or a Bluetooth communication interface.

[0031] The operation device 24 is a device that accepts input operations from a user, and may be configured using, for example, a mouse, a keyboard, a lever, a button, or a touch panel.

[0032] The display device 25 is a device that displays information to the user, and may be configured using a display, a touch panel, or the like.

[0033] <SNR pattern by sector> Fig. 3 is a conceptual diagram illustrating a receiver sector sweep according to the present embodiment. Fig. 4 is a conceptual diagram showing a sector-by-sector SNR pattern obtained by the receiver sector sweep according to the present embodiment. The relationship between the beamforming sector and the sector-by-sector SNR pattern will be described with reference to Figs. 3 and 4.

[0034] As shown in Fig. 3, the first radio device 10A and the second radio device 10B perform a receiver sector sweep. First, the first radio device 10A, which is the transmitting side, transmits a training signal. The second radio device 10B, which is the receiving side, receives the training signal while switching sectors from No. 0 to No. 32, and measures the SNR (unit: dB), which is the signal quality of the received signal.

[0035] The above measurements provide a pattern of data showing the SNR (unit: dB), which is the signal quality for each sector No., as shown in Figure 4. This pattern is referred to as the sector-specific SNR pattern.

[0036] Fig. 5 is a diagram for explaining the relationship between the sector-specific SNR pattern and the power distribution pattern. Fig. 5 illustrates the sector-specific SNR pattern and the strength of the received power according to the installation height of the antenna 15 of the second radio device 10B. The sector-specific SNR pattern when the height of the antenna 15 of the second radio device 10B is ha is pattern A. The sector-specific SNR pattern when the height of the antenna 15 of the second radio device 10B is hb is pattern B. The sector-specific SNR pattern when the height of the antenna 15 of the second radio device 10B is hc is pattern C.

[0037] In the case of pattern B, the SNR value of the central sector, for example sectors No. 14 to No. 18, is the highest and the received power is the largest. Also, the SNR values ​​of sectors other than the central sector are significantly lower than those of other patterns.

[0038] In the case of patterns A and C, the SNR value of the central sector is not as high as that of pattern B. Also, the SNR value near sector No. 4 is somewhat high. Therefore, referring to FIG. 1 as well, it is estimated that the height of antenna 15 where radio waves arriving in a straight line from first radio device 10A to second radio device 10B are dominant and which is less susceptible to adverse effects from reflected waves from the ground, etc., is height hb.

[0039] It is also estimated that as the height of antenna 15 increases, the magnitude of the received power by antenna 15 changes as shown by the dashed line. That is, as the height of antenna 15 increases, the received power changes somewhat regularly, increasing almost monotonically from a minimum value (valley) to a peak (mountain), then decreasing monotonically to the minimum value (valley) again. This regular change in the received power according to the height of antenna 15 is referred to as a power distribution pattern.

[0040] In order to minimize the influence of reflected waves and the like, the antenna 15 should be installed at a position in the power distribution pattern where the received power is maximum. In the embodiment shown in FIG. 5, the position in the power distribution pattern where the received power is maximum is the position of height hb. This position corresponds to the peak (mountain) of the power distribution pattern. Note that above the power distribution pattern that includes height hb, there is also a power distribution pattern that similarly comprises valleys, peaks, and valleys. The position of the peak of the power distribution pattern is also the position in the power distribution pattern where the received power is maximum.

[0041] Fig. 6 is a sequence diagram showing an example of an installation process of an antenna according to the present embodiment. Fig. 7 is a conceptual diagram showing an installation example of wireless device 10 corresponding to Fig. 1. The process of determining the antenna installation height will be described with reference to Figs. 6 and 7.

[0042] The user in FIG. 6 is assumed to be an operator who installs the wireless device 10. The user installs the first wireless device 10A at an arbitrary height (ht) (step S1). The user installs the second wireless device 10B at an arbitrary height (hr) (step S2). The user starts a height adjustment program stored in the memory 22 of the management device 20 (step S3). At this time, the management device 20 is notified of the value of the height ht of the first wireless device 10A from the first wireless device 10A. Alternatively, the user may input the value of the height ht to the management device 20. Similarly, the management device 20 may be notified of the value of the height hr of the second wireless device 10B from the second wireless device 10B. Alternatively, the user may input the value of the height hr to the management device 20.

[0043] The processor 21 of the management device 20 wirelessly connects the first radio device 10A and the second radio device 10B (step S4). The processor 21 of the management device 20 acquires a sector-specific SNR pattern and a distance d between the radio devices from the second radio device 10B (step S5). The sector-specific SNR pattern is obtained by the receiver sector sweep described with reference to FIG. 3. The second radio device 10B can acquire the distance d between the radio devices based on the time it takes for a signal to return from the first radio device 10A or the received power (e.g., Received Signal Strength Indication (RSSI)).

[0044] The processor 21 of the management device 20 inputs the sector-specific SNR pattern and the distance d between the wireless devices acquired in step S5 to the trained model 221 (step S6).

[0045] Here, the trained model 221 will be described in more detail. The trained model 221 is configured by a neural network. There are no particular limitations on the structure or architecture of the neural network used in the present embodiment. Below, the trained model 221 used in the embodiment of the present disclosure will be described by exemplifying a general neural network that includes an input layer and an output layer and performs supervised learning by back propagation. It goes without saying that the neural network may have a hidden layer.

[0046] Input data based on the sector-specific SNR pattern and input data based on the distance d between the wireless devices are input to the input layer of the neural network constituting the trained model 221. The input data to the input layer may be data that has been appropriately converted or preprocessed by the processor 21 on the original data.

[0047] The output layer of the neural network outputs a value or a set of values ​​from which a position within a power distribution pattern, which will be described later, can be calculated.

[0048] The processor 21 acquires a value indicating a position in the power distribution pattern (position in the pattern) based on the output from the trained model 221. In this embodiment, the value indicating the position in the power distribution pattern is h ratio Here, h ratio =Δh0 / Δhr.

[0049] Δh0 corresponds to the difference between the current height (=hr) of antenna 15 and the height of the start point of the power distribution pattern (the valley of the received power in FIG. 7) which is below the current height of antenna 15. In other words, Δh0 is a value indicating how high antenna 15 is currently installed from the height of the start point of the power distribution pattern.

[0050] Δhr corresponds to the difference in height between the start point of the power distribution pattern (the valley of the received power in FIG. 7) and the end point (the next valley of the received power after passing the peak). In other words, Δhr is a value indicating the pitch (length) of one power distribution pattern in the height direction (Z-axis direction). Δhr is also called the height pattern pitch. If the power distribution pattern is periodic, Δhr corresponds to the height of one period.

[0051] The neural network constituting the trained model 221 may be a trained one that has been trained in advance. The training process of the neural network may be executed by the management device 20 or may be executed by a device different from the management device 20, such as a server equipped with a GPU.

[0052] Returning to the description of FIG. 6, the processor 21 of the management device 20 calculates h ratio is obtained (step S7).

[0053] In addition, the output of the trained model 221 is h ratio The trained model 221 may be configured so that: ratioIn either case, the processor 21 may calculate h based on the output data of the trained model 221. ratio Get the value of .

[0054] The processor 21 of the management device 20 calculates the height pattern pitch Δhr from the height ht of the first wireless device 10A and the distance d between the wireless devices (step S8). In the case of a power distribution pattern as shown in FIG. 5, which is assumed in this embodiment, the height pattern pitch Δhr is calculated by the following formula (1). Δhr = λd / 2ht … (1) Here, λ represents the wavelength of the radio wave used in millimeter wave communication.

[0055] The processor 21 of the management device 20 calculates an adjustment value Δh of the installation height of the antenna 15 based on the following formula (2) (step S9). Δh=(0.5-h ratio ) × Δhr … (2) The processor 21 then notifies the user of the adjustment value Δh. There are various possible modes for notifying the user of the adjustment value Δh, one example of which will be described later with reference to FIG.

[0056] The user raises the height of the second radio device 10B in accordance with the value of the adjustment value Δh (step S10). Note that if the adjustment value Δh is a negative value, the user lowers the height of the second radio device 10B.

[0057] The user finally checks the communication speed between the first radio device 10A and the second radio device 10B (step S11). Since the height adjustment of the second radio device 10B based on the adjustment value Δh has been performed, the communication speed has been improved.

[0058] In addition, when the situation of the reflected wave from the ground changes and the reception quality at the second radio device 10B is deteriorated, the process from step S5 to step S9 shown in FIG. 6 may be executed again. That is, the management device 20 may reacquire the sector-specific SNR pattern for the reflected wave whose situation has changed, recalculate the adjustment value Δh, and notify the user. Then, the user may readjust the height of the second radio device 10B based on the notified adjustment value Δh. This allows the user to recognize that the situation of the reflected wave from the ground has changed and the reception quality at the second radio device 10B has deteriorated due to the notification. In addition, the user can improve the reception quality at the second radio device 10B by readjusting the height of the second radio device 10B.

[0059] 8 is a diagram showing an example of notification of the adjustment value of the antenna installation height by management device 20, which corresponds to step S9. In this embodiment, a case where management device 20 is a smartphone will be described as an example. Processor 21 of management device 20 causes display device 25 to display adjustment value Δh as an image, for example, as follows.

[0060] When the management device 20 is a smartphone, a touch panel screen of the smartphone corresponds to the display device 25. The worker inserts the management device 20 into a fixing slot or the like provided in the second wireless device 10B. This makes the second wireless device 10B and the management device 20, which is a smartphone, integrated and movable without changing their relative positions.

[0061] A guidance screen is displayed on the display device 25. The second wireless device 10B and the management device 20 are displayed on the guidance screen. The guidance screen displays a text message saying "Adjust the height. Move the corresponding jig", an arrow indicating the direction in which to move the jig, and a "Next" button. When the worker taps the "Next" button on such a guidance screen, the processor 21 causes the display device 25 to display a height adjustment screen.

[0062] In the height adjustment screen, the processor 21 causes the display device 25 to display a horizontal line L1 indicating the optimum height to be the target of the second wireless device 10B and a horizontal line L2 indicating the current height hr of the second wireless device 10B. The optimum height indicated by the horizontal line L1 is the height obtained by adding the adjustment value Δh to the current height hr of the second wireless device 10B. That is, the distance between the horizontal line L1 and the horizontal line L2 corresponds to the adjustment value Δh. The processor 21 also causes the display device 25 to display a text message saying "Please adjust to the target." The worker moves the second wireless device 10B integrated with the management device 20 so that the horizontal line L2 coincides with the horizontal line L1. In this embodiment as shown in FIG. 7, the second wireless device 10B integrated with the management device 20 is moved upward. At this time, the management device 20, which is a smartphone, has a function of estimating the moving direction and distance. For example, the smartphone is equipped with an acceleration sensor or an air pressure sensor, and can calculate the moving distance in the height direction based on information obtained from the acceleration sensor or the air pressure sensor. The distance between the horizontal line L1 and the horizontal line L2 increases or decreases according to the calculated moving distance in the height direction.

[0063] When horizontal line L2 and horizontal line L1 coincide with each other, processor 21 causes display device 25 to display a jig fixing screen. On the jig fixing screen, processor 21 causes display device 25 to display text messages such as "Target met" and "Please fix the jig", as well as a "Done" button. When the user taps the "Done" button, processor 21 causes display device 25 to display a completion screen. On the completion screen, processor 21 causes display device 25 to display a text message such as "Height is adjusted", as well as a check mark indicating completion of the work.

[0064] For example, by having the processor 21 cause the display device 25 to display an image as described above, the person installing the wireless device 10 can easily adjust the height of the second wireless device 10B and the antenna 15 while looking at the display device 25.

[0065] Summary of the Disclosure The contents of this disclosure can be expressed as follows.

[0066] <Expression 1> The communication system 1 includes a first radio device 10A, a second radio device 10B that receives radio waves transmitted from the first radio device 10A, and a management device 20. The management device 20 determines an adjustment value for the installation height of the antenna 15 based on the reception quality for each sector by beamforming in the antenna 15 included in the second radio device 10B and the distance between the first radio device 10A and the second radio device 10B. This makes it possible to adjust the installation height of the antenna 15 of the second radio device 10B based on the determined adjustment value. Also, degradation of reception quality due to interference from reflected waves from the ground, etc. can be appropriately suppressed.

[0067] <Expression 2> In expression 1, a position within a specified power distribution pattern, which is a position corresponding to the current installation height of antenna 15, may be identified based on the above-mentioned reception quality and the above-mentioned distance, and an adjustment value for the installation height of antenna 15 may be determined based on the identified position within the pattern. This makes it possible to determine the adjustment value for the installation height of the antenna 15 of the second radio device 10B based on the position within a predetermined power distribution pattern.

[0068] <Expression 3> In expression 2, the adjustment value of the installation height of antenna 15 may be a value indicating the deviation between the position within the pattern and the position in the power distribution pattern where the received power is maximum. As a result, by adjusting the installation height of the antenna 15 of the second radio device 10B based on the determined adjustment value, it is possible to further suppress deterioration of reception quality due to interference from reflected waves from the ground or the like.

[0069] <Expression 4> In expression 3, the management device 20 may display an image showing the deviation between the position within the pattern and the position in the power distribution pattern where the received power is maximum. This allows the worker to easily adjust the installation height of the antenna 15 of the second radio device 10B while looking at the displayed screen.

[0070] <Expression 5> In expression 2, the management device 20 identifies the position within the pattern using a trained model 221 that receives as input data data based on the distance between the first radio device 10A and the second radio device 10B and data based on the reception quality for each sector, and receives as output data data that can calculate the position within the pattern. As a result, the management device 20 can calculate the position within the pattern by utilizing the trained model 221 by acquiring the distance d between the wireless devices and the sector-specific SNR pattern.

[0071] <Expression 6> In a method for determining an installation height of an antenna 15 of a second radio device 10B that receives radio waves transmitted from a first radio device 10A, the installation height is determined by a management device 20. The management device 20 determines an adjustment value for the installation height of the antenna based on the reception quality for each sector by beamforming in the antenna 15 and the distance between the first radio device 10A and the second radio device 10B. This makes it possible to adjust the installation height of the antenna 15 of the second radio device 10B based on the determined adjustment value. Also, degradation of reception quality due to interference from reflected waves from the ground, etc. can be appropriately suppressed.

[0072] <Expression 7> The management device 20 includes a processor 21. The processor 21 acquires data indicating the reception quality for each sector by beamforming in an antenna 15 included in a second radio device 10B that receives radio waves transmitted from a first radio device 10A, and data indicating the distance between the first radio device 10A and the second radio device 10B. The processor 21 outputs an adjustment value for the installation height of the antenna 15 based on the data indicating the reception quality and the data indicating the distance. This makes it possible to adjust the installation height of the antenna 15 of the second radio device 10B based on the determined adjustment value. Also, degradation of reception quality due to interference from reflected waves from the ground, etc. can be appropriately suppressed.

[0073] Although the embodiments have been described above with reference to the accompanying drawings, the present disclosure is not limited to such examples. It is clear that a person skilled in the art can conceive of various modifications, corrections, substitutions, additions, deletions, and equivalents within the scope of the claims, and it is understood that these also belong to the technical scope of the present disclosure. In addition, the components in the above-mentioned embodiments may be arbitrarily combined within the scope of the invention. [Industrial Applicability]

[0074] INDUSTRIAL APPLICABILITY The present disclosure is useful as a communication system, an antenna installation height determination method, and a management device that determine the installation height of an antenna of a receiving wireless device, which can appropriately suppress deterioration of reception quality due to interference such as reflected waves from the ground, etc. [Explanation of symbols]

[0075] 1. Communication Systems 10 Radio equipment 11 Processors 12. Memory 13 Connection Interface 14 Wireless Interface 15 Antenna 20 Management device 21 Processors 22 Memory 221 trained models 23 Connection Interface 24 Control device 25 Display device

Claims

1. A first wireless device; a second wireless device that receives radio waves transmitted from the first wireless device; A communication system comprising: The management device includes: determining an adjustment value for an installation height of the antenna based on a reception quality for each sector by beamforming in an antenna included in the second wireless device and a distance between the first wireless device and the second wireless device; Communication systems.

2. The management device includes: identifying a position in a predetermined power distribution pattern that corresponds to a current installation height of the antenna based on the reception quality and the distance; determining an adjustment value for the installation height of the antenna based on the identified position within the pattern; The communication system according to claim 1 .

3. The adjustment value of the antenna installation height is a value indicating a deviation between a position in the pattern and a position where the power in the power distribution pattern is maximized. The communication system according to claim 2.

4. the management device displays an image showing a deviation between the position within the pattern and a position in the power distribution pattern where the power is maximum. The communication system according to claim 3.

5. the management device uses a trained model in which data based on a distance between the first wireless device and the second wireless device and data based on the reception quality for each sector are input data, and data from which the position within the pattern can be calculated is output data, and the management device specifies the position within the pattern using a trained model. The communication system according to claim 2.

6. 1. A method for determining an installation height of an antenna of a second wireless device that receives radio waves transmitted from a first wireless device, comprising: determining an adjustment value for an installation height of the antenna based on a reception quality for each sector by beamforming in the antenna and a distance between the first wireless device and the second wireless device; method.

7. identifying a position within a predetermined power distribution pattern that corresponds to a current installation height of the antenna based on the reception quality and the distance; determining an adjustment value for the installation height of the antenna based on the identified position within the pattern; The method according to claim 6.

8. The adjustment value of the antenna installation height is a value indicating a deviation between a position in the pattern and a position where the power in the power distribution pattern is maximized. The method according to claim 7.

9. displaying an image showing a deviation between the position within the pattern and a position in the power distribution pattern where the power is maximum; The method according to claim 8.

10. identifying the position within the pattern using a trained model in which data based on a distance between the first wireless device and the second wireless device and data based on the reception quality for each sector are used as input data, and data from which the position within the pattern can be calculated is used as output data; The method according to claim 7.

11. a processor that acquires data indicating a reception quality for each sector by beamforming in an antenna of a second wireless device that receives radio waves transmitted from a first wireless device and data indicating a distance between the first wireless device and the second wireless device, and outputs an adjustment value for an installation height of the antenna based on the data indicating the reception quality and the data indicating the distance; Management device.

12. The processor, identifying a position within a predetermined power distribution pattern that corresponds to a current installation height of the antenna based on the reception quality and the distance; determining an adjustment value for the installation height of the antenna based on the identified position within the pattern; The management device according to claim 11.

13. The adjustment value of the antenna installation height is a value indicating a deviation between a position in the pattern and a position where the power in the power distribution pattern is maximized. The management device according to claim 12.

14. the processor displays on a display device an image showing a deviation between the position within the pattern and a position where the power is maximum in the power distribution pattern. The management device according to claim 13.

15. The processor uses a trained model in which data based on a distance between the first wireless device and the second wireless device and data based on a reception quality for each sector are input data, and data from which the position within the pattern can be calculated is output data, and identifies the position within the pattern using the trained model. The management device according to claim 12.

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