JP7470176B1 - Wireless repeater, control method, and program for suppressing amplification of unnecessary waves - Google Patents

Abstract

[Problem] To provide a technology for suppressing deterioration of wireless quality caused by wireless repeaters. [Solution] In a wireless communication system, a wireless repeater acquires information on the transmission power of a signal (radio wave) to be measured, transmitted from a communication device to which the radio waves are relayed (S401), measures the wireless signal (radio wave) transmitted from the communication device (S402) and acquires its received power (S403), estimates a transmission path loss based on the transmission power information acquired by acquiring the transmission power information and the received power information acquired by measuring the received power, determines an amplification factor based on the transmission path loss (S404), amplifies the radio wave arriving from a terminal device according to the determined amplification factor, and transmits it in the direction of the communication device (S405). [Selected Figure] Figure 4

Description

The present invention relates to technology for suppressing the amplification of unwanted waves in wireless repeaters.

In cellular communication systems, wireless repeaters are a promising option for expanding communication areas at low cost.

Since wireless repeaters have a simple configuration that amplifies and outputs input radio waves, they also amplify and output noise and interference waves. As a result, for example, in a communication device (e.g., a base station device or another wireless repeater) that receives a signal amplified by the wireless repeater, unnecessary noise may be received at a level that exceeds the noise floor of the communication device. Furthermore, in this communication device, interference waves may also be received at a power level that is higher than expected, making it difficult to ensure sufficient wireless quality.

The present invention provides technology that suppresses degradation of wireless quality caused by wireless repeaters.

A wireless repeater according to one embodiment of the present invention has an acquisition means for acquiring information on the transmission power of radio waves at a base station device receiving the radio waves output from the wireless repeater from System Information Block Type 1 (SIB1) transmitted by the base station device, a measurement means for measuring the received power at the wireless repeater of the radio waves transmitted from the base station device, an estimation means for estimating the magnitude of transmission path loss to the base station device based on the received power and information on the transmission power of the radio waves at the base station device, an identification means for identifying an amplification factor determined based on the magnitude of the transmission path loss obtained by the estimation , and an amplification means for amplifying and outputting the radio waves with the identified amplification factor.
According to another aspect of the present invention, a wireless repeater includes a specifying means for specifying an amplification factor determined based on the magnitude of a transmission path loss between the wireless repeater and a communication device receiving the wireless radio waves output from the wireless repeater, and an amplifying means for amplifying and outputting the wireless radio waves at the specified amplification factor, and the communication device notifies a predetermined device other than the wireless repeater of information on the transmission power of the wireless radio waves sent from the communication device, and the wireless repeater includes a measuring means for measuring the reception power of the wireless radio waves sent from the communication device at the wireless repeater, a notifying means for notifying the predetermined device of the information on the reception power, and a notifying means for receiving a signal from the predetermined device. The communication device further includes an acquisition means for acquiring information indicating the magnitude of the transmission path loss or the amplification factor identified based on the received power and the transmission power of the radio waves in the communication device, wherein when information indicating the magnitude of the transmission path loss is acquired by the acquisition means, the acquisition means determines the amplification factor based on the magnitude of the transmission path loss, and when information indicating the amplification factor is acquired by the acquisition means, the amplification means amplifies and outputs the radio waves with the amplification factor identified by the acquisition means, and when information indicating the magnitude of the transmission path loss is acquired by the acquisition means, the amplification means amplifies and outputs the radio waves with the amplification factor identified by the acquisition means.

The present invention makes it possible to suppress deterioration of wireless quality caused by wireless repeaters.

FIG. 1 is a diagram illustrating an example of the configuration of a wireless communication system. FIG. 2 is a diagram illustrating an example of a hardware configuration of a wireless repeater. FIG. 2 is a diagram illustrating an example of a functional configuration of a wireless repeater. FIG. 2 is a diagram illustrating an example of a flow of processes executed in the system. FIG. 2 is a diagram illustrating an example of a flow of processes executed in the system.

The following embodiments are described in detail with reference to the attached drawings. Note that the following embodiments do not limit the invention according to the claims, 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 combination. In addition, the same reference numbers are used for the same or similar configurations, and duplicate descriptions are omitted.

(System configuration)
FIG. 1 shows an example of the configuration of a wireless communication system according to this embodiment. This wireless communication system is, for example, a cellular communication system conforming to the fifth generation (5G) standard or its successor standard. In this wireless communication system, a base station device 101 and terminal devices 121 to 122 establish a connection to perform wireless communication. Here, communication between the base station device 101 and the terminal devices 121 to 122 is relayed by a wireless repeater. For example, communication between the base station device 101 and the terminal device 121 is relayed by a wireless repeater 111, and communication between the base station device 101 and the terminal device 122 is relayed by a wireless repeater 112 and a wireless repeater 113. The wireless repeater is configured to amplify and output an input radio wave. For example, a wireless signal transmitted by the terminal device 121 reaches the wireless repeater 111, which amplifies the wireless signal and radiates it in the direction of the base station device 101. Furthermore, the radio signal transmitted by the terminal device 122 reaches the wireless repeater 112, which then amplifies the radio signal and radiates it in the direction of the wireless repeater 113. The wireless repeater 113 then amplifies the radio signal received from the wireless repeater 112 and radiates it in the direction of the base station device 101. This enables the terminal devices 121 and 122, which are in positions where they cannot directly communicate with the base station device 101, to communicate with the base station device 101.

A wireless repeater has a simple configuration that amplifies and outputs the input radio waves. For this reason, the wireless repeater also amplifies and outputs the received noise and interference waves, and the noise and interference may be received at an unnecessarily large power by the communication device to which the signal is to be relayed (for example, the base station device 101 or another wireless repeater). For example, the noise input level in a predetermined frequency range (for example, a frequency range of six physical resource blocks (PRBs) in the 5G standard) in the wireless repeater 111 is X [dBm], and the radio waves are amplified by AMP [dB]. Here, the antenna gain when the radio waves are emitted from the wireless repeater 111 is Ga [dBi], and the antenna gain when the radio waves are received at the base station device 101 is Gb [dBi]. In this case, the reception noise level Xr in the base station device 101 is Xr = X + AMP + Ga + Gb - PL [dBm]. Here, PL [dB] is the transmission path loss. PL can be, for example, the free space loss plus a fading margin.

Here, for example, assume that X = -98 [dBm/6PRB], AMP = 83 [dB], Ga = 23 [dBi], Gb = 23 [dBi], and PL = 122 [dB]. In this case, Xr = -98 + 83 + 23 - 122 + 23 = -91 [dBm/6PRB], and the reception noise level Xr is greater than the reception noise level X in the wireless repeater 111. In other words, if the amplification factor is high and AMP > PL - Ga - Gb, Xr > X. In view of this situation, in this embodiment, the amplification factor is controlled based on the magnitude of the transmission path loss from the wireless repeater to the communication device (base station device or other wireless repeater) that receives the radio waves amplified and output by the wireless repeater. In other words, the wireless repeater of this embodiment is configured to be able to change the amplification factor within a certain range, and relays radio waves at an amplification factor according to the magnitude of the transmission path loss between the communication device to which the radio waves are to be relayed. For example, the amplification factor of the above-mentioned AMP is determined so that AMP = PL - Ga - Gb. In this case, Xr = X + AMP + Ga + Gb - PL = X, so the noise reception power level is the same at the wireless repeater and the relay communication device.

Note that the noise figure (NF) levels of the wireless repeater and the communication device to which the radio waves are to be relayed may differ. In this case, the amplification factor is set so that, when the noise figure of the wireless repeater is NFa and the noise figure of the communication device to which the radio waves are to be relayed is NFb, AMP = PL - Ga - Gb - NFa + NFb. For example, assume that Ga = 23 [dBi], Gb = 23 [dBi], PL = 122 [dB], NFa = 7 dB, and NFb = 4 dB. Note that the noise floor of the wireless repeater is -98 [dBm/6 PRB], and the noise floor of the communication device to which the radio waves are to be relayed is -101 [dBm/6 PRB]. In this case, AMP = 122 - 23 - 23 - 7 + 4 = 73 [dB]. By amplifying radio waves according to the AMP value calculated in this manner, it is possible to equalize the noise power levels in the wireless repeater and the communication device at the relay destination, taking into account the noise factor. Also, for example, with respect to the wireless repeater and communication device described above, it is possible to prevent noise with power below the noise floor in the wireless repeater from being received at a power above the noise floor in the communication device at the relay destination of the radio waves. Note that by setting the AMP value as described above, it is also possible to prevent unnecessary amplification of interference waves. Also, by setting the AMP value based on the transmission path loss, the desired signal received at least with sufficient power in the wireless repeater is received with sufficient power in the communication device at the relay destination, and there is no deterioration in radio quality.

In this way, the wireless repeater according to this embodiment can properly relay the desired signal while not unnecessarily amplifying and relaying noise and interference, improving the frequency utilization efficiency of the wireless communication system as a whole and improving communication efficiency. Note that, when the wireless quality can be maintained sufficiently good, for example when the distance between the wireless repeater and the communication device to which the radio waves are to be relayed is short, the radio waves may be amplified and relayed according to a value smaller than the AMP value defined in the above explanation. In other words, to prevent the effects of noise from increasing, it is sufficient to define the AMP value so that AMP≦PL-Ga-Gb or AMP≦PL-Ga-Gb-NFa+NFb is satisfied.

The magnitude of the transmission path loss may be estimated by the wireless repeater, or may be estimated by a specified device other than the wireless repeater. When the magnitude of the transmission path loss is estimated by the wireless repeater, the wireless repeater is configured to measure, for example, the received power (received strength) of the radio waves transmitted by the communication device to which the radio waves are relayed. At this time, the wireless repeater is also configured to obtain information on the transmission power when the communication device to which the radio waves are relayed transmits the radio waves. The wireless repeater can estimate the magnitude of the transmission path loss by subtracting the received power of the radio waves from the transmission power of the radio waves. When the wireless repeater estimates the magnitude of the transmission path loss, it can determine the amplification factor (the above-mentioned AMP value) based on the estimated value.

In this case, for example, when the communication device is a base station device, the wireless repeater may obtain information on the transmission power of the radio waves in the communication device from the system information (for example, SystemInformationBlockType1 (SIB1) message) transmitted by the base station device. SIB1 includes information called ss-PBCH-blockpower, which indicates the transmission power (power density) per resource element. Note that the average value of the transmission power of the radio waves (average transmission power) may be notified here. Based on this information, the wireless repeater can identify the transmission power of the radio waves sent by the base station device and estimate the magnitude of the transmission path loss by comparing the received power of the radio waves with the transmission power. Note that SIB1 is an example, and the transmission power may be identified by other information elements. Note that in this case, the wireless repeater includes a processing circuit for demodulating and decoding information that enables at least the transmission power to be identified. With this configuration, the wireless repeater can obtain the transmission power of the radio waves from the base station device from the signal transmitted by that base station device, and can further estimate the magnitude of the transmission path loss based on the radio waves transmitted by that base station device. In other words, in this case, the wireless repeater can independently determine the amplification factor and perform relay processing without the assistance of other devices.

The wireless repeater may also obtain information on the transmission power of the radio waves in the communication device to which the radio waves are to be relayed from a specified device other than the communication device. In this case, the communication device may notify the specified device of the transmission power information, and the wireless repeater may obtain the transmission power information from the specified device. In this case, for example, the wireless repeater may be configured to relay 5G signals while communicating with the specified device using a communication function such as Long Term Evolution (LTE), Bluetooth (registered trademark), or wireless local area network (LAN). The wireless repeater may also communicate with the specified device using, for example, a wired communication function. In such a method in which an external specified device is involved, for example, the communication device to which the radio waves are to be relayed may be a device that does not spontaneously send signals, such as another wireless repeater. In this case, the wireless repeater has a function of notifying the specified device of information on the output strength of the radio waves in its own device. If the communication device to which the radio waves are to be relayed is a base station device, the communication device must transmit system information, etc., and the wireless repeater can obtain information on the transmission power by decoding this information. On the other hand, if the communication device to which the radio waves are to be relayed is another wireless repeater, the wireless repeater only amplifies and relays the radio waves received from the other device, and does not transmit a signal that can identify the output power during relay transmission. In contrast, a specific device intervenes to collect and distribute information on the output strength of the radio waves at each wireless repeater, allowing the wireless repeater to obtain information on the output strength of the radio waves from other wireless repeaters and to estimate the magnitude of the transmission path loss to the other wireless repeater.

The wireless repeater may communicate with other wireless repeaters using, for example, the Sidelink communication function of LTE, and obtain information on the output strength when relaying 5G radio waves from the other wireless repeaters through this communication. In this case, the wireless repeater needs to have the functionality of an LTE terminal device (at least the functionality of communicating directly with other terminal devices), but no external device needs to be involved.

As described above, the wireless repeater may determine the amplification factor based on the first noise figure of the communication device to which the radio waves are to be relayed and the second noise figure of the repeater itself. In this case, the wireless repeater may obtain information indicating the first noise figure from the communication device or an external specified device. When an external specified device is used, the communication device to which the radio waves are to be relayed (a base station device or another wireless repeater) notifies the noise figure information of the repeater itself. In this case, as described above, the communication device may notify the external specified device of the information on the transmission power of the radio waves. This allows the wireless repeater to obtain the information on the transmission power and noise figure of the radio waves in the communication device to which the radio waves are to be relayed. The specified device that collects and distributes the transmission power of the radio waves and the specified device that collects and distributes the information on the noise figure may be the same device or may be separate devices. In addition, one of the information on the transmission power of the radio waves and the information on the noise figure may be directly notified to the wireless repeater from the communication device, and the other may be notified from the specified device.

On the other hand, when the magnitude of the transmission path loss is estimated by a specific external device, the wireless repeater notifies the specific device of the measurement result (received power) of the radio waves sent from the communication device to which the radio waves are relayed. The specific device also acquires information on the transmission power of the radio waves in the communication device to which the radio waves are relayed from the communication device. The specific device then estimates the magnitude of the transmission path loss from the value of the transmission power in the communication device and the value of the reception power in the wireless repeater. The specific device then notifies the wireless repeater of information indicating the magnitude of the transmission path loss. The specific device may also specify an amplification factor to be used by the wireless repeater and notify the wireless repeater of the amplification factor information. When the wireless repeater receives information indicating the magnitude of the transmission path loss, it calculates the amplification factor (AMP) using the magnitude of the transmission path loss PL as described above, and uses the calculated AMP value to amplify the received radio waves and output them in the direction of the communication device. On the other hand, when the wireless repeater receives information indicating the amplification factor, it uses the notified amplification factor to amplify the received radio waves and output them in the direction of the communication device. In this way, when the magnitude of the transmission path loss and the value of the amplification factor are calculated by a specific external device, the wireless repeater does not need to have the computing power for these calculations. In addition, the abundant computing power of the specific external device may be used to calculate, for example, an average of the magnitude of the transmission path loss over a certain time range or a weighted average using a forgetting factor, and the calculation result may be used as the magnitude of the transmission path loss when determining the amplification factor. Similarly, the average of the amplification factor values over a certain time range or a weighted average using a forgetting factor may be calculated, and the calculation result may be determined as the value of the amplification factor to be used in the wireless repeater. In addition, the specific device may use, for example, artificial intelligence (AI) to calculate the magnitude of the transmission path loss and the value of the amplification factor used to calculate the amplification factor based on the time transition of the transmission path loss.

The amplification factor may be determined using the noise figure values of the wireless repeater and the communication device, as in the above case. In this case, the communication device may notify the specified device of its first noise figure information, and the wireless repeater may notify the specified device of its second noise figure information. The specified device may then determine the amplification factor value or the magnitude of the transmission path loss to be used for calculating the amplification factor value based on the transmission power of the radio waves and the value of the first noise figure of the communication device, and the reception power of the radio waves and the value of the second noise figure of the wireless repeater, and notify the wireless repeater of the determined value. In this case, the magnitude of the transmission path loss PL to be used for calculating the amplification factor value is a value obtained by adding an offset due to the difference in noise figures to the actual transmission path loss value. When the wireless repeater receives this value, it determines the amplification factor using the formula AMP = PL - Ga - Gb. In this case, since the difference in noise figures is reflected in the value of PL, the amplification factor can be determined by this calculation while taking the difference in noise figures into account.

The wireless repeater may measure, for example, the received power of a synchronization signal and a physical broadcast channel (SSB/PBCH) transmitted from a base station device, or may measure a reference signal transmitted from a base station device. If the communication device to which the radio waves are relayed is another wireless repeater, the wireless repeater may measure the SSB/PBCH or reference signal relayed by the other wireless repeater. Signals (radio waves) other than these may also be measured.

Here, in the above embodiment, a method for determining the amplification factor when relaying an uplink signal has been described, but the present invention is not limited to this. That is, the amplification factor when relaying a downlink signal may be determined in a similar manner. For example, the wireless repeater 113 in FIG. 1 measures the signal transmitted from the wireless repeater 112, and estimates the transmission path loss between the wireless repeater 112 and the wireless repeater 113 based on the transmission power when the signal is transmitted. The wireless repeater 113 then determines the amplification factor based on the estimated value, amplifies the radio waves received from the base station device 101 using the amplification factor, and relays the signal in the direction of the wireless repeater 112. Note that the calculation of the amplification factor at this time may also take into account noise figure information.

(Device configuration)
An example of the hardware configuration of the wireless repeater will be described with reference to FIG. 2. In one example, the wireless repeater includes a processor 201, a ROM 202, a RAM 203, a storage device 204, and a communication circuit 205. The processor 201, the ROM 202, the RAM 203, and the storage device 204 are hardware parts for executing the process of determining the above-mentioned amplification factor and the process of controlling the amplification factor during relay transmission using the amplification factor. Here, the processor 201 is a computer including one or more processing circuits such as a general-purpose CPU (Central Processing Unit) or an ASIC (Application Specific Integrated Circuit), and executes the overall processing of the device and each of the above-mentioned processes by reading and executing programs stored in the ROM 202 and the storage device 204. The ROM 202 is a read-only memory that stores information such as programs related to the processing executed by the DU and the RIC, various parameters, etc. The RAM 203 functions as a workspace when the processor 201 executes a program, and is also a random access memory that stores temporary information. The storage device 204 is, for example, a removable external storage device. On the other hand, the communication circuit 205 is a hardware part that implements basic functions as a wireless repeater, such as an antenna, a variable amplifier, and, if necessary, a frequency converter. The communication circuit 205 may also include a hardware part for LTE communication or wired communication for communicating with a specific external device. The communication circuit 205 may also include a hardware part that can demodulate and decode a part (e.g., system information) of a signal (e.g., a 5G signal) that is the target of relay transmission.

Figure 3 is a diagram showing an example of the functional configuration of a wireless repeater. The wireless repeater includes, as its functions, a measurement unit 301, an information acquisition unit 302, an amplification factor determination unit 303, and an amplification control unit 304. These functional units can be realized, for example, by the processor 201 executing a program stored in the ROM 202 and cooperating with the communication circuit 205. Note that these functional configurations are merely examples, and for example, one functional block may be divided into multiple functional blocks, or multiple functional blocks may be integrated into one functional block. Also, some functional blocks may be omitted, and other functional blocks not shown may be added.

The measurement unit 301 measures the wireless signal sent from the communication device to which the radio waves are relayed, and acquires the received power (reception strength). The information acquisition unit 302 and the amplification factor determination unit 303 acquire necessary information from a specific external device or the communication device to which the radio waves are relayed, and determine the amplification factor to be used during relay transmission based on the information and the measurement results in the measurement unit 301.

For example, the information acquisition unit 302 acquires information indicating the transmission power of the radio waves in the communication device measured by the measurement unit 301 by demodulating and decoding a wireless signal transmitted from the communication device to which the radio waves are relayed. The amplification factor determination unit 303 then estimates the magnitude of the transmission path loss from the transmission power and the received power acquired by the measurement unit 301, and calculates the amplification factor based on the magnitude of the transmission path loss as described above. Note that at this time, the information acquisition unit 302 may acquire the noise figure value of the communication device, and the amplification factor determination unit 303 may calculate the amplification factor further based on the noise figure values of the communication device and its own device.

Also, for example, the information acquisition unit 302 may notify a specific device of information indicating the received power of the measurement result in the measurement unit 301, and acquire information on the transmission path loss and the amplification factor from the specific device. When the information on the transmission path loss is acquired, the amplification factor determination unit 303 calculates the amplification factor based on the information as described above. When the information on the amplification factor is acquired, the amplification factor determination unit 303 may identify the value indicated by the information on the amplification factor as the amplification factor to be used. Note that in this case, the information acquisition unit 302 may notify the specific device of information on the noise figure of its own device, and acquire information on the magnitude of the transmission path loss and the amplification factor taking into account the difference in noise figure with the communication device.

The amplification control unit 304 controls the communication circuit 205 to amplify the received radio waves using the amplification factor identified by the amplification factor identification unit 303.

(Processing flow)
Next, an example of the flow of processing executed in the wireless communication system will be described. Fig. 4 shows an example of the flow of processing when the wireless repeater estimates the transmission path loss and determines the amplification factor.

In this process, the wireless repeater acquires information on the transmission power of the signal (radio wave) to be measured from the communication device to which the radio wave is to be relayed (S401). Note that in the example of FIG. 4, the communication device notifies an external device (server) of the transmission power information, and the wireless repeater acquires the transmission power information from the server. However, the wireless repeater may acquire this information directly by demodulating and decoding the signal sent from the communication device. Also, the communication device may provide information on its own noise figure (first noise figure) to the server, and the wireless repeater may acquire the first noise figure information. Note that the wireless repeater may also acquire this first noise figure information directly by demodulating and decoding the signal sent from the communication device.

Then, the wireless repeater measures the wireless signal (radio wave) sent from the communication device and acquires the received power (S402, S403). The acquisition of the transmission power information and the measurement of the wireless signal may be performed in parallel, or the acquisition of the transmission power information may be performed after the measurement of the wireless signal. The wireless repeater estimates the transmission path loss based on the transmission power information obtained in S401 and the reception power information obtained in S403, and determines the amplification factor based on the transmission path loss (S404). At this time, the wireless repeater may specify a value obtained by performing statistical processing such as an average value for the reception power or a weighted average value using a forgetting factor, and estimate the magnitude of the transmission path loss based on that value. In addition, when the wireless repeater acquires information on a first noise figure related to the communication device, for example, the wireless repeater may determine the amplification factor based on the value of this first noise figure and the value of a second noise figure related to the device itself. The wireless repeater then amplifies the radio waves received, for example from a terminal device, according to the determined amplification factor and transmits them in the direction of the communication device (S405).

Next, FIG. 5 describes an example of the process flow when a specific device (server) different from the wireless repeater and the communication device estimates the transmission path loss. In this process, information on the transmission power of the radio waves sent from the communication device to which the radio waves are relayed by the wireless repeater is provided to the server (S501). Here, the communication device may notify the server of its own first noise figure value. Note that in this process example, this transmission power information does not need to be notified to the wireless repeater. The wireless repeater measures the radio signal (radio waves) sent from the communication device and obtains the received power (S502, S503), and transmits information including a value indicating the received power to the server (S504). Here, the wireless repeater may notify the server of its own second noise figure value.

The server estimates the transmission path loss between the communication device and the wireless repeater based on the acquired information (S505). For example, the wireless repeater may estimate the difference between the transmission power information received in S501 and the reception power information received in S504 as the value of the transmission path loss. At this time, the server may identify a value obtained by performing statistical processing such as an average value for the reception power or a weighted average value using a forgetting factor, and estimate the magnitude of the transmission path loss based on that value. In addition, when the server acquires, for example, first noise figure information related to the communication device and second noise figure information related to the wireless repeater, the server may adjust the magnitude of the transmission path loss based on the first noise figure value and the second noise figure value. For example, the server may add an offset corresponding to the magnitude of the difference between the first noise figure value and the second noise figure value to the transmission path estimation value identified based on the transmission power information received in S501 and the reception power information received in S504, and identify the value of the magnitude of the transmission path loss after adjustment.

The server provides the wireless repeater with information on the identified transmission path loss (S506). The wireless repeater uses the information on the transmission path loss to determine the amplification factor to be used when relaying radio waves to the communication device (S507). The wireless repeater then amplifies the radio waves arriving from, for example, a terminal device according to the determined amplification factor and transmits them in the direction of the communication device (S508). Note that, in the process of FIG. 5, an example has been shown in which the server estimates the magnitude of the transmission path loss and provides the estimated value to the wireless repeater, but the server may also determine the amplification factor and provide the value of the amplification factor to the wireless repeater. In this case, the wireless repeater will amplify the radio waves with the notified amplification factor and transmit them in the direction of the communication device.

In this way, by preventing a variable gain wireless repeater from being set to a higher gain than necessary, it is possible to prevent excessive amplification of noise and interference waves, improve the frequency utilization efficiency of the wireless communication system as a whole, and increase communication efficiency. This makes it 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."

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

Claims (10)

A wireless repeater,
An acquisition means for acquiring information on transmission power when a base station device that receives radio waves output from the wireless repeater transmits radio waves from a SystemInformationBlockType1 (SIB1) transmitted by the base station device;
a measuring means for measuring a reception power of a radio wave transmitted from the base station device at the wireless repeater;
an estimation means for estimating a magnitude of a transmission path loss up to the base station device based on the received power and information on the transmission power in the base station device ;
A determination means for determining an amplification factor determined based on the magnitude of the transmission path loss obtained by the estimation ;
an amplifier for amplifying and outputting the radio wave at the specified amplification factor;
A wireless repeater comprising: 2. The wireless repeater according to claim 1 , wherein the specifying means determines the amplification factor based further on a first noise figure in the base station device and a second noise figure in the wireless repeater. The base station device notifies information of the first noise figure to a predetermined device other than the wireless repeater;
3. The wireless repeater according to claim 2 , wherein the acquiring means acquires the information on the first noise figure from the predetermined device. A wireless repeater,
a determination means for determining an amplification factor that is determined based on a magnitude of a transmission path loss between the wireless repeater and a communication device that receives the radio waves output from the wireless repeater;
an amplifier for amplifying and outputting the radio wave at the specified amplification factor;
having
The communication device notifies a predetermined device other than the wireless repeater of information on a transmission power of a radio wave transmitted from the communication device;
The wireless repeater includes:
a measuring means for measuring a reception power of the radio wave transmitted from the communication device at the wireless repeater;
a notification means for notifying the predetermined device of information on the reception power;
an acquisition means for acquiring information indicating the magnitude of the transmission path loss or the amplification factor specified based on the reception power and the transmission power in the communication device from the predetermined device;
and
the specifying means determines the amplification factor based on the magnitude of the transmission path loss when the acquiring means acquires information indicating the magnitude of the transmission path loss;
when the acquisition means acquires information indicating the amplification factor, the amplification means amplifies and outputs the radio wave at the amplification factor, and when the acquisition means acquires information indicating the magnitude of the transmission path loss, the amplification means amplifies and outputs the radio wave at the amplification factor specified by the specification means.
A wireless repeater characterized by: 5. The wireless repeater according to claim 4 , wherein the amplification factor is determined further based on a first noise figure in the communication device and a second noise figure in the wireless repeater. The communication device further notifies the predetermined device of information on the first noise figure;
The notification means further notifies the predetermined device of information on the second noise figure,
The acquiring means acquires information indicating the magnitude of the transmission path loss or the amplification factor specified based on the received power, the transmission power of the radio wave in the communication device, the first noise figure, and the second noise figure from the predetermined device.
6. The wireless repeater according to claim 5 . A control method performed by a wireless repeater, comprising the steps of:
Acquiring information on transmission power when a base station device that receives radio waves output from the wireless repeater transmits radio waves from a SystemInformationBlockType1 (SIB1) transmitted by the base station device;
measuring a received power of a radio wave transmitted from the base station device at the wireless repeater;
estimating a magnitude of a transmission path loss up to the base station device based on the received power and information on the transmission power at the base station device ;
specifying an amplification factor determined based on the magnitude of the transmission path loss obtained by the estimation ; and
amplifying and outputting the radio wave at the specified amplification factor;
A control method comprising: A control method performed by a wireless repeater, comprising the steps of:
Specifying an amplification factor that is determined based on a magnitude of a transmission path loss between the wireless repeater and a communication device that receives the radio waves output from the wireless repeater;
amplifying and outputting the radio wave at the specified amplification factor;
Including,
The communication device notifies a predetermined device other than the wireless repeater of information on a transmission power of a radio wave transmitted from the communication device;
The control method includes:
measuring a received power of the radio wave transmitted from the communication device at the wireless repeater;
notifying the predetermined device of information on the received power;
acquiring information indicating a magnitude of the transmission path loss or the amplification factor specified based on the reception power and the transmission power in the communication device from the predetermined device;
When identifying the amplification factor, if information indicating a magnitude of the transmission path loss is acquired, determining the amplification factor based on the magnitude of the transmission path loss;
When information indicating the amplification factor is acquired, the radio wave is amplified at the amplification factor and outputted, and when information indicating the magnitude of the transmission path loss is acquired, the radio wave is amplified at the specified amplification factor and outputted;
A control method comprising: The computer installed in the wireless repeater
A base station device that receives radio waves output from the wireless repeater acquires information on transmission power when transmitting radio waves from a SystemInformationBlockType1 (SIB1) transmitted by the base station device;
Measure the received power of the radio wave transmitted from the base station device at the wireless repeater;
based on the received power and information on the transmission power of the radio wave in the base station device, estimate a magnitude of a transmission path loss up to the base station device;
specifying an amplification factor determined based on the magnitude of the transmission path loss obtained by the estimation ;
amplifying and outputting the radio wave at the specified amplification factor;
Program for. The computer installed in the wireless repeater
specifying an amplification factor determined based on the magnitude of a transmission path loss between the wireless repeater and a communication device that receives the radio waves output from the wireless repeater;
amplifying and outputting the radio wave at the specified amplification factor;
A program for:
The communication device notifies a predetermined device other than the wireless repeater of information on a transmission power of a radio wave transmitted from the communication device;
The program causes the computer to
Measure the received power of the radio wave transmitted from the communication device at the wireless repeater;
notifying the predetermined device of information on the reception power;
acquiring, from the predetermined device, information indicating the magnitude of the transmission path loss or the amplification factor specified based on the reception power and the transmission power of the radio wave in the communication device;
When the amplification factor is specified, if information indicating a magnitude of the transmission path loss is acquired, the amplification factor is determined based on the magnitude of the transmission path loss;
When information indicating the amplification factor is acquired, the radio wave is amplified at the amplification factor and output, and when information indicating the magnitude of the transmission path loss is acquired, the radio wave is amplified at the specified amplification factor and output.
A program characterized by:

Images