Wireless repeater suitable for mesh network, control apparatus, and program

Abstract

To suppress wraparound interference in a wireless repeater used in a mesh network.SOLUTION: A wireless repeater which amplifies radio waves input via a first antenna and outputs the radio waves from a second antenna is configured to: measure first wireless communication quality of signals input via a first beam while the signals input via the first beam set in the first antenna are not amplified or output by the second antenna; measure second wireless communication quality of the signals input via the first beam while the signals input via the first beam are amplified and output via a second beam set in the second antenna; and determine and set a beam to be used for communication in at least one of the first and second antennas, based on the amount of change between the first wireless communication quality and the second wireless communication quality.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a technique for configuring a wireless repeater. [Background technology]

[0002] In order to cope with the ever-increasing traffic in cellular communication networks, the use of high-frequency bands that can ensure large capacity is being considered. However, the higher the frequency band used, the greater the attenuation of radio waves over distance. Therefore, installing multiple base stations to provide wireless services over a wide area increases the installation costs. To address this issue, the construction of mesh networks using wireless repeaters that amplify and relay signals between base station equipment and terminal devices is being considered. Summary of the Invention [Problem to be solved by the invention]

[0003] A wireless repeater amplifies and outputs a received signal, so if the output signal is transmitted back to the input, the transmitted signal component will interfere with the input signal. [Means for solving the problem]

[0004] The present invention provides a technique for suppressing radio interference in wireless repeaters used in mesh networks.

[0005] A wireless repeater according to one embodiment of the present invention is a wireless repeater that amplifies radio waves input via a first antenna and outputs them from a second antenna, and has: a first measuring means that measures a first wireless quality of a signal input via a first beam set in the first antenna when the signal input via the first beam is not amplified and output by the second antenna; a second measuring means that measures a second wireless quality of the signal input via the first beam when the signal input via the first beam is amplified and output via a second beam set in the second antenna; and a setting means that determines and sets a beam to be used for communication in at least one of the first antenna and the second antenna based on the amount of change between the first wireless quality and the second wireless quality. [Effects of the Invention]

[0006] According to the present invention, it is possible to suppress radio interference in a wireless repeater used in a mesh network. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a diagram illustrating an example of the configuration of a wireless communication system. [Figure 2] FIG. 1 is a diagram illustrating an example of antenna arrangement in a wireless repeater. [Figure 3] FIG. 1 is a diagram for explaining the influence of a self-reflection wave; [Figure 4] FIG. 10 is a diagram illustrating an example of a flow of processing executed by a wireless repeater. [Figure 5] FIG. 1 is a diagram illustrating the configuration of an SSB. [Figure 6] FIG. 10 is a diagram illustrating an example of the configuration of a service beam. [Figure 7] FIG. 10 is a diagram illustrating an example of a flow of processing executed by a wireless repeater. [Figure 8] FIG. 10 is a diagram illustrating an example of a flow of processing executed by a wireless repeater. [Figure 9]FIG. 1 is a diagram illustrating an example of the configuration of a wireless repeater. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, the embodiments will be described in detail with reference to the accompanying drawings. Note that the following embodiments do not limit the scope of the invention as claimed, and not all combinations of features described in the embodiments are necessarily essential to the invention. Two or more of the features described in the embodiments may be combined in any desired manner. Furthermore, the same reference numerals are used to designate identical or similar components, and redundant descriptions will be omitted.

[0009] (System Configuration) FIG. 1 shows an example of the configuration of a wireless communication system according to this embodiment. This wireless communication system is a mesh network using wireless repeaters and includes a base station device 101 and wireless repeaters 111 to 119. The base station device 101 may be, for example, a node having base station functionality compliant with a fifth-generation (5G) gNodeB or a later-generation cellular communication standard. The wireless repeaters 111 to 119 are, for example, distributed so that a signal transmitted from the base station device 101 reaches a wide area. The wireless repeaters 111 to 119 are configured to amplify radio waves arriving from a specific direction and output the amplified signal in a direction different from the direction of arrival. For example, the wireless repeater 111 is configured to receive a signal from the base station device 101 using a reception beam directed toward the base station device 101 and output the amplified signal in a direction different from the direction of the base station device 101. The wireless repeater 111 forms a transmission beam in the reception beam directed toward the base station device 101 so that the signal relayed by the wireless repeater 111 is not received at a level above a predetermined level, and outputs the amplified signal. The wireless repeater 112 can receive the signal output from the wireless repeater 111 with a quality equal to or higher than a predetermined wireless quality by directing the reception beam toward the wireless repeater 111. The wireless repeater 112 is configured to amplify the received signal and output the amplified signal in a direction different from the direction of the wireless repeater 111. On the other hand, it is expected that the wireless repeater 114 and the wireless repeater 115 can also receive the signal output from the wireless repeater 111 with a quality equal to or higher than a predetermined wireless quality by directing the reception beam toward the wireless repeater 111. However, the wireless repeater 114 and the wireless repeater 115 do not receive the signal output from the wireless repeater 111 with sufficient power by directing their receiving beams toward the base station device 101 and the wireless repeater 114, respectively. However, the wireless repeater 114 and the wireless repeater 115 can receive the signals from the base station device 101 and the wireless repeater 114, respectively, with sufficient power. In this way, each section of the relay communication path is set, as represented by the arrows in FIG. 1.

[0010] (Wireless repeater configuration) FIG. 2A shows an example of the configuration of wireless repeaters 111 to 119 according to this embodiment. Hereinafter, when there is no need to distinguish between the wireless repeaters 111 to 119, they will be collectively referred to simply as "wireless repeaters." Each wireless repeater includes multiple antennas (antenna panels 201 to 204), each capable of forming a beam within a certain range. Each of the multiple antennas is configured to be able to set the beam direction within a certain angular range. While FIG. 2A and the following examples illustrate an example in which the wireless repeater has four antennas, the wireless repeater may have, for example, five or more antennas, or even two or three antennas. The greater the number of antennas, the narrower the angular range that each antenna must cover. For example, when a beam is formed to cover the entire angular range, the narrower the angular range, the more the gain within that range can be improved. For example, signals from other devices within that angular range can be received with sufficient power. Furthermore, when the same power is supplied to each antenna, a narrower range of angles allows the signal transmitted from that antenna to reach a longer distance. Although each antenna can form a narrow beam for communication, the beam may not have sufficient gain when directed in a specific direction, such as near the edge of the range. By narrowing the range of angles, a beam with sufficient gain can be formed. For example, if a wireless repeater is installed on a wall, no antenna is required on the wall side. In this case, the wireless repeater can communicate with various ranges of angles using two or three antennas.

[0011] In such a wireless repeater, an antenna whose corresponding angle range includes the position of a relay source device (base station device 101 or another wireless repeater) is selected, and a detailed beam directed to the relay source device is set using that antenna. The detailed beam is set, for example, by measuring radio signals arriving from the surroundings at each antenna panel. For example, multiple beams that can be set at each antenna panel may be predefined, and the beam with the best radio signal reception quality may be selected as the beam to be set when that antenna panel is used. Alternatively, the detailed beam may be set based on a transmission path estimate of a signal received at each antenna panel.

[0012] The wireless repeater measures the wireless quality (e.g., reference signal received power (RSRP) or signal-to-interference and noise ratio (SINR)) of wireless signals received in configurable beams at each antenna panel, and identifies the beam that provides the best wireless quality. The wireless repeater then compares the best wireless qualities at each antenna panel to determine the antenna panel to use when receiving signals from the base station device 101 or another wireless repeater (relay source device). The wireless repeater then forms a beam that provides the best wireless quality using the antenna panel determined to be used, and receives the wireless signal transmitted from the relay source device. Note that, hereinafter, the antenna determined to be used may be referred to as a "donor antenna," and the beam formed using the donor antenna may be referred to as a "donor beam." The wireless repeater may amplify a signal received using the donor beam and transfer the amplified signal using an antenna other than the donor antenna. Hereinafter, the antenna other than the donor antenna may be referred to as a "service antenna," and the beam used when transferring a signal from the service antenna may be referred to as a "service beam." The wireless signal transmitted using the service beam is received by a terminal device or other wireless repeater located within the area formed by the service beam. Note that a wide beam may be formed as the service beam to provide wireless service to terminal devices located over a certain wide area. On the other hand, since the location of the relay source device is assumed to be fixed, a narrow beam with high gain is formed as the donor beam.

[0013] As shown in FIG. 2(A), a wireless repeater uses multiple antennas (antenna panels 201 to 204), with at least one of the antennas functioning as a donor antenna and the others as service antennas. However, this is just one example. The wireless repeater may have separate antenna groups that can be used only as donor antennas and donor beams, and separate antenna groups that can be used as service antennas and service beams, as shown in FIG. 2(B). The wireless repeater of FIG. 2(B) has a structure in which two antenna groups, each configured as shown in FIG. 2(A), are stacked one on top of the other, with the first antenna group 221 usable as a service antenna and the second antenna group 222 usable as a donor antenna. In this configuration, one of the antenna panels in the antenna group 222 is selected as a donor antenna, and the other antenna panels in the antenna group 222 are not used. Then, a radio signal received and amplified by the donor antenna is output from the antenna group 221. Alternatively, the antenna group usable as service antennas may be the second antenna group 222, and the antenna group usable as donor antennas may be the first antenna group 221.

[0014] In a wireless repeater configured with a donor antenna and a service antenna as described above, a signal transmitted from the service antenna may be received by the donor antenna. For example, radio waves transmitted from the service antenna may be reflected by an object such as a building located near the service antenna, and the reflected waves may be received by the donor antenna. In this case, the signal including the reflected waves may be amplified and output, which may reduce the radio quality (e.g., signal-to-interference and noise ratio (SINR)) of the output signal or may cause unintended behavior such as oscillation. As a result, such radio interference may reduce the efficiency of the entire wireless communication system. For this reason, this embodiment provides a technology for suppressing the effects of such radio interference.

[0015] Orthogonal frequency division multiplexing (OFDM)-based modulation technology is used in 5G cellular communication systems and other applications. To reduce the effects of delayed signals, OFDM-based modulation employs a cyclic prefix (CP), which adds a fixed portion of the time waveform at the end of a symbol to the beginning of that symbol. By using this CP and appropriately selecting the time interval (FFT window) in which the fast Fourier transform (FFT) is performed at the receiving device, the signal can be demodulated without interference from delayed signals arriving with a time delay within the CP time length. On the other hand, for delayed signals arriving with a time delay exceeding the CP length, their effects cannot be eliminated, regardless of how the FFT window is configured, and they disrupt signal demodulation as interference. For example, when a signal is first input to a wireless repeater at t = T0 in Figure 3, the signal is amplified and output, and then re-input to the wireless repeater at t = T0 + Δt as radio interference. This signal output and input is repeated at t=T0+2Δt and t=T0+3Δt. At this time, the radio repeater also receives radio waves that have been deflected and are amplified before being output. As a result, at t=T0+2Δt, the radio wave interference arrives with an even greater delay than at t=T0+Δt. However, up until t=T0+2Δt, the deflected radio wave can be treated as a delayed wave within the CP length, so it is expected that the impact on the reception performance of this radio wave will be sufficiently small. However, at t=T0+3Δt, the radio wave interference reaches beyond the CP length of the radio wave that was initially input.

[0016] In this case, the wireless repeater can sufficiently suppress the power of the loop interference wave by appropriately setting the beam pattern in the output direction. That is, for example, if the loop interference wave at least at t = T0 + 3Δt is suppressed to below the noise level of the wireless repeater, the impact of the loop interference wave on the reception performance can be sufficiently suppressed. On the other hand, if the amplification factor is reduced, for example, to suppress the power of the loop interference wave, it may become difficult to efficiently operate the mesh network. In consideration of this situation, this embodiment provides a technology that appropriately sets a service beam to ensure sufficient isolation between the donor beam and the service beam and suppress the reception strength of the loop interference wave received in the service beam at least beyond the CP length.

[0017] (Processing flow) An example of the flow of processing executed in the wireless repeater according to this embodiment will be described. FIG. 4 shows an example of a method for determining a service beam that suppresses the influence of radio echo interference. The processing described below may be performed, for example, when the wireless repeater is installed. The following processing may be executed at a predetermined interval, for example, once a day. In one example, the following processing may be executed during a time period when there is little user data communication.

[0018] In this processing example, the wireless repeater measures radio signals arriving from the surrounding area using each of multiple donor beam candidates, and determines the donor beam to actually use based on the measurement results (S401). For example, the wireless repeater 111, the wireless repeater 114, and the wireless repeater 115 set the candidate beam corresponding to the direction in which radio waves from the base station device 101 can be received with the highest quality as the donor beam. Then, the wireless repeater measures radio quality using the determined donor beam without using a service beam (i.e., without amplifying and outputting radio waves). This radio quality measurement is performed, for example, using a synchronization signal (SS) / physical broadcast channel (PBCH) block (SSB) periodically broadcast and transmitted from the base station device 101. While data signals and the like may be measured, using the SSB as the measurement target allows for stable measurement even when there is no user data. Furthermore, as shown in FIG. 5, the SSB transmits the Primary SS (PSS), Secondary SS (SSS), and PBCH consecutively in time, and the PSS and SSS are transmitted using predefined sequences, so that the radio quality can be easily estimated. In this embodiment, in order to perform control to suppress the influence of radio loop interference that arrives with a delay exceeding the CP, radio quality is measured using, for example, the SSS. That is, if no signal is transmitted before the PSS, the radio quality of the PSS may not be reduced even in the presence of radio loop interference. However, since the PBCH always exists before the SSS, the influence of radio loop interference can be reliably evaluated by measuring the radio quality. Radio quality may be measured using the entire SSB. The radio quality to be measured may be, for example, RSRP or SINR, but is not limited thereto. For example, a received signal strength indicator (RSSI) may also be measured. At the time of S402, relaying is not performed, so the radio quality measured is the radio quality without the influence of radio loop interference.

[0019] The wireless repeater then performs a process for determining whether or not a predetermined, non-negligible level of radio interference occurs for each of a plurality of available beams for the service antenna, each of which has a gain peak pointing in a different direction. In one example, the wireless repeater performs an initialization process (S403) to sequentially evaluate each of the plurality of beams. The wireless repeater measures radio quality when using each candidate service beam (S404) and determines whether or not the measurement result has changed (S405). If the radio interference exceeds the CP and is received at a non-negligible level (power), the measurement result will be degraded. That is, if a non-negligible level of radio interference occurs, if the radio quality measured in S404 is SINR, the value will drop beyond a certain level. Furthermore, if the measured radio quality is RSRP or RSSI, the value may fluctuate by more than a predetermined level due to interference. Conversely, even if radio interference exists, if the power drops to the noise level, it may be determined that there is no effect. In this case, it is assumed that the decrease in the SINR value and the change in the RSRP and RSSI values ​​will not exceed a predetermined level. The wireless repeater repeatedly performs this process for all candidate service beams (S406, S407). Then, the wireless repeater identifies a beam in which the effect of loop interference is low enough (negligible) that it can be evaluated as a noise level (S408). In this way, the wireless repeater can determine a beam in which the effect of loop interference is sufficiently low as the service beam to be used.

[0020] The wireless repeater may also identify candidate service beams for which the effect of loop interference cannot be ignored, form a beam with a null in the direction of the gain peak of the identified beam, and determine the beam as the service beam. Examples of such service beams are shown in Figures 6(A) and 6(B). Figure 6(A) shows an example in which a beam with a null in the direction of a beam for which the effect of loop interference cannot be ignored is identified. In one example, the service antenna may be configured with an antenna array including multiple antenna elements. The wireless repeater may then identify the direction of the gain peak of one or more candidate service beams for which the effect of loop interference cannot be ignored, calculate antenna weights for forming a beam with a null (or a sufficiently low gain) in that direction, and apply the weights to each antenna element to form a beam pattern such as that shown in Figure 6(A). Note that a beam pattern may be pre-defined and stored for each direction in which a null should be directed, and the wireless repeater may identify one or more candidate service beams for which the effect of radio interference cannot be ignored, and read and use a beam in which a null is formed in a direction corresponding to one or more candidate beams (combinations of candidates). The wireless repeater may also use a combination of multiple different beams, as shown in FIG. 6(B). In this case, for example, each beam may be configured to output a signal with a different polarization. This allows the wireless repeater to use, for example, some of the candidate service beams evaluated in FIG. 4 as they are. Alternatively, for example, the antenna panel may be divided into multiple regions, and a service beam may be configured using a different directional pattern for each region.

[0021] The wireless repeater may repeatedly execute the process of Fig. 4 for each of one or more service antennas. Alternatively, the wireless repeater may execute the process of Fig. 4 collectively for a combination of multiple service antennas. That is, all combinations of candidate service beams for each service antenna may be used to evaluate the change in radio quality for each combination, and a combination of beams that can ignore the effect of radio interference may be identified.

[0022] In the above example, we have described a case where one donor beam is determined, and then the impact of loop interference is evaluated for each candidate service beam for that donor beam. Alternatively, the donor beam may be determined after the service beam is determined. For example, a wireless repeater may determine a service beam according to the location of the signal forwarding destination, and when that service beam is used, it may determine to use a beam from among the candidate donor beams that has a low impact of loop interference. An example of the processing flow in this case is shown in Figure 7.

[0023] The wireless repeater first determines a service beam (S701) and then performs initialization processing for determining a subsequent donor beam (S702). The wireless repeater then measures the wireless quality of each of a plurality of donor beam candidates when relaying using the service beam is not performed (S703), and also measures the wireless quality when relaying using the service beam (S704). The wireless repeater then compares the measurement results in S703 with those in S704, and evaluates the effect of radio interference in the same manner as the processing in FIG. 4 described above (S705). If the measurement results in S703 show that the wireless quality does not reach a predetermined level, the wireless repeater may decide not to use the candidate beam as a donor beam and skip the subsequent processing. The wireless repeater repeats the above-described measurement and evaluation for each of multiple candidate donor beams (S706, S707) and identifies a beam with low impact of loop interference and high wireless quality as the donor beam (S708). In this way, when a service beam is predetermined, a donor beam with low impact of loop interference from the service beam can be selected. In this case, even if the wireless quality observed in the donor beam while relaying by the service beam is not performed is relatively low, a combination of beams with low impact of loop interference and capable of obtaining good wireless quality when relaying is performed can be used.

[0024] As shown in FIG. 8, the wireless repeater may determine the combination of beams to be used by comparing the wireless quality of each combination of donor beams and service beams with and without relaying. In the process of FIG. 8, after the initialization process (S801), the wireless quality is measured without relaying using only candidate donor beams (S802), and then the wireless quality is measured while relaying using candidate service beams (S803). Based on the measurement results, the influence of loop interference in the combination of beams to be processed is evaluated (S804). Then, by changing either the donor beam or the service beam, the measurement and evaluation are repeated for each different combination (S805 to S808). The wireless repeater then identifies a combination of donor beams and service beams that has low influence of loop interference and high wireless quality (S809).

[0025] In selecting a donor beam, the donor beam to be used may be determined from all donor beam candidates using the above-described process. Alternatively, the above-described process may be performed on only some of the donor beam candidates. That is, some of the multiple beams that can be set in the donor antenna may be selected as donor beam candidates, and the process of FIG. 7 or 8 may be performed, with the remaining beams excluded from the process. In one example, only beams from which the same SSB is detected may be selected as donor beam candidates. The SSBs to be detected here may be specified in advance. For example, SSBs other than the SSB transmitted from a specific base station device (e.g., base station device 101) may be selected as relay targets, and SSBs other than the SSB may be ignored even if detected. Alternatively, the donor beam candidate may be a beam from which a specific SSB is detected at a power level equal to or greater than a predetermined level. The predetermined level may be a predetermined power level, or may be, for example, a value obtained by subtracting a predetermined offset value from the maximum SSB reception level among multiple beams. Note that SSB is just one example, and a beam that receives a predetermined signal from a specific communication device to be relayed at a predetermined level or above or within a certain range may be identified as a candidate donor beam. Furthermore, if a donor beam is pre-set in a wireless repeater (a donor beam already in use exists), a beam that is expected to be able to receive radio waves through the same propagation environment as the currently set donor beam may be identified as a candidate donor beam. For example, among the beams that can be formed by the donor antenna, beams directed within a predetermined angle range (e.g., 5 to 10 degrees) from the direction of the currently set donor beam may be identified as candidate donor beams, and other beams may be excluded from the candidate donor beams. When the candidate donor beams are limited in this way, for example, steps S707 and S808 may be replaced with a determination of whether the number of beams considered for the donor antenna has reached the limited number of candidate donor beams. With this configuration, the donor beam selection process can be performed by limiting the donor beam candidates rather than selecting all beams that can be configured by the donor antenna, thereby, for example, shortening the time required for processing and reducing the processing load such as calculation processing.

[0026] (Device configuration) Figure 9 shows an example of the configuration of a wireless repeater. The wireless repeater is configured to amplify and output an input signal without demodulating it, and therefore includes a receiving unit 901, an amplifying unit 902, and an output unit 903. In this embodiment, the wireless repeater can selectively use a donor beam to be used when receiving a signal from among multiple candidates, and includes a donor beam control unit 904 for setting the donor beam. The wireless repeater can also set a service beam to be used when outputting the amplified signal, and includes a service beam control unit 905 for setting the service beam. The wireless repeater also includes a control unit 906 that performs processing to cause the donor beam control unit 904 and the service beam control unit 905 to perform appropriate control.

[0027] The control unit 906 may be configured, for example, by a computer including one or more processors and one or more memories. The memory is configured to store predetermined computer-readable programs or instructions, and the processor executes the programs or instructions to cause the control unit 906 to perform predetermined functions. Note that the control unit 906 may also be configured by dedicated hardware configured to perform the predetermined functions. The predetermined functions include, for example, a first wireless quality measurement unit 911, a second wireless quality measurement unit 912, and a beam designation unit 913. The first wireless quality measurement unit 911 measures the wireless quality of a signal (SSB) received via a donor beam when radio waves are not output by a service beam.

[0028] The first wireless quality measurement unit 911, for example, notifies the donor beam control unit 904 of information specifying one of multiple donor beam candidates, and outputs an instruction to the amplifier 902 not to amplify and output radio waves. The first wireless quality measurement unit 911 can, for example, output an instruction to the donor beam control unit 904 so that measurements are performed by switching between multiple donor beam candidates in a time-division manner. The second wireless quality measurement unit 912 measures the wireless quality of a signal (SSB) received via the donor beam while radio waves are being output by the service beam. The second wireless quality measurement unit 912, for example, notifies the donor beam control unit 904 of information specifying one of multiple donor beam candidates, notifies the service beam control unit 905 of an instruction to set one of the beams having gain peaks in different directions, and further outputs an instruction to the amplifier 902 to amplify and output radio waves. For example, when a single donor beam is determined, the second wireless quality measurement unit 912 may output an instruction to the service beam control unit 905 to perform measurement by switching among multiple candidate service beams in a time-division manner. Furthermore, when a unique service beam is determined, the second wireless quality measurement unit 912 may output an instruction to the donor beam control unit 904 to perform measurement by switching among multiple candidate donor beams in a time-division manner. Furthermore, the second wireless quality measurement unit 912 may output instructions to the donor beam control unit 904 and the service beam control unit 905 to perform measurement by switching among combinations of donor beams and service beams in a time-division manner. The beam designation unit 913 identifies a combination of donor beams and service beams based on the results of measurements by the first wireless quality measurement unit 911 and the second wireless quality measurement unit 912, outputs an instruction to the donor beam control unit 904 to use the donor beam corresponding to the combination, and outputs an instruction to the service beam control unit 905 to use the service beam corresponding to the combination.

[0029] In this manner, in this embodiment, the impact of radio interference due to relaying is evaluated based on the radio quality when relaying is not performed and the radio quality when relaying is performed. Then, based on the results of this evaluation, a beam is selected so that the impact of radio interference is low and the radio quality of the donor beam is sufficient for communication. This makes it possible to suppress radio interference in wireless repeaters used in mesh networks and prevent a decrease in system efficiency. Therefore, it is possible to contribute to Goal 9 of the United Nations-led Sustainable Development Goals (SDGs), which is to "build resilient infrastructure, promote sustainable industrialization and foster innovation."

[0030] The invention is not limited to the above-described embodiment, and various modifications and variations are possible within the scope of the gist of the invention.

Claims

1. A wireless repeater that amplifies radio waves input via a first antenna and outputs the amplified radio waves from a second antenna, a first measuring means for measuring a first wireless quality of a signal input via a first beam set in the first antenna, in a state in which the signal is not amplified and is not output by the second antenna; a second measuring means for measuring a second radio quality of a signal input via the first beam in a state in which the signal input via the first beam is amplified and output via a second beam set in the second antenna; a setting means for determining and setting a beam to be used for communication in at least one of the first antenna and the second antenna based on a change amount between the first wireless quality and the second wireless quality; A wireless repeater comprising:

2. the second measurement means measures the second radio quality by switching among the second beams in a time division manner; the setting means determines, among the plurality of second beams, a beam in which a change amount between the first wireless quality and the second wireless quality does not exceed a predetermined level as a beam to be used for communication by the second antenna; 2. The wireless repeater according to claim 1.

3. the second measurement means measures the second wireless quality by switching among the plurality of first beams in a time division manner; the setting means determines, among the plurality of first beams, a beam in which a change amount between the first radio quality and the second radio quality does not exceed a predetermined level as a beam to be used for communication by the first antenna; 2. The wireless repeater according to claim 1.

4. The wireless repeater described in claim 3, characterized in that the second measurement means identifies the plurality of first beams from among the configurable beams in accordance with the reception level of a predetermined signal transmitted from a specific device in each of the configurable beams in the first antenna.

5. the second measurement means measures the second wireless quality by switching among a plurality of combinations of each of the plurality of first beams and each of the plurality of second beams in a time-division manner; the setting means determines, from among the plurality of combinations, a combination of the first beam and the second beam in which a change amount between the first wireless quality and the second wireless quality does not exceed a predetermined level, as a beam to be used for communication by the first antenna and the second antenna.

2. The wireless repeater according to claim 1.

6. The wireless repeater described in claim 5, characterized in that the second measurement means identifies the plurality of first beams from among the configurable beams in accordance with the reception level of a predetermined signal transmitted from a specific device in each of the configurable beams in the first antenna.

7. 6. The wireless repeater according to claim 1, wherein the signal is a synchronization signal (SS) / physical broadcast channel (PBCH) block (SSB) transmitted from a base station device, and the first wireless quality and the second wireless quality are either a reference signal received power (RSRP), a signal-to-interference-and-noise ratio (SINR), or a received signal strength indicator (RSSI).

8. 8. The wireless repeater according to claim 7, wherein the first measuring means and the second measuring means measure the first wireless quality and the second wireless quality using a Secondary SS (SSS).

9. The wireless repeater described in claim 1, characterized in that the setting means determines a beam with a null directed in the direction of the gain peak in the second beam as the beam to be used for communication in the second antenna when the change between the first wireless quality and the second wireless quality exceeds a predetermined level.

10. further comprising a storage means for prestoring a beam having a null directed in the direction of the gain peak in the second beam; 10. The wireless repeater according to claim 9, wherein the setting means reads out the stored beam and sets the beam in the second antenna.

11. 10. The wireless repeater according to claim 9, wherein the setting means sets a plurality of beams having gain peaks in a direction different from the direction of the gain peak in the second beam in the second antenna.

12. 12. The wireless repeater according to claim 11, wherein signals of different polarizations are output in each of the plurality of beams.

13. 12. The wireless repeater of claim 11, wherein the second antenna is an antenna panel, the antenna panel being divided into a plurality of regions, and the plurality of regions being configured to constitute each of the plurality of beams.

14. A control method executed by a wireless repeater that amplifies radio waves input via a first antenna and outputs the amplified radio waves from a second antenna, comprising: measuring a first wireless quality of a signal input via a first beam set in the first antenna in a state in which the signal is not amplified and is not output by the second antenna; measuring a second radio quality of the signal input via the first beam in a state in which the signal input via the first beam is amplified and output via a second beam set in the second antenna; determining and setting a beam to be used for communication in at least one of the first antenna and the second antenna based on a change amount between the first wireless quality and the second wireless quality; A control method comprising:

15. 15. A program for causing a computer provided in a wireless repeater that amplifies radio waves input via a first antenna and outputs the amplified radio waves from a second antenna to execute the control method according to claim 14.

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