WO2022064718A1 - Wireless communication system, electric field intensity control method, software wireless device, and electric field intensity control program - Google Patents

Wireless communication system, electric field intensity control method, software wireless device, and electric field intensity control program Download PDF

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Publication number
WO2022064718A1
WO2022064718A1 PCT/JP2020/036727 JP2020036727W WO2022064718A1 WO 2022064718 A1 WO2022064718 A1 WO 2022064718A1 JP 2020036727 W JP2020036727 W JP 2020036727W WO 2022064718 A1 WO2022064718 A1 WO 2022064718A1
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Prior art keywords
frequency band
antenna
communication
electric field
gain
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PCT/JP2020/036727
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French (fr)
Japanese (ja)
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利文 宮城
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日本電信電話株式会社
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Priority to JP2022551117A priority Critical patent/JP7380899B2/en
Priority to PCT/JP2020/036727 priority patent/WO2022064718A1/en
Publication of WO2022064718A1 publication Critical patent/WO2022064718A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices

Definitions

  • This disclosure relates to wireless communication systems, electric field strength control methods, software defined radios, and electric field strength control programs, and is particularly suitable for controlling electric field strength so as to satisfy the provisions of weak radio stations. , Field strength control methods, software defined radios, and field strength control programs.
  • Patent Document 1 discloses a wireless communication device capable of suppressing wasteful power consumption of a communication partner. This device detects the electric field strength of the radio wave received from the communication partner and determines whether the value is within the preset reference range. In addition, this device instructs the communication partner to change the transmission output so that the electric field strength of the radio wave received from the other party is within the reference range. As a result, the device described in Patent Document 1 realizes a system capable of controlling the electric field strength of radio waves used for communication.
  • the device described in Patent Document 1 instructs to change the transmission output according to the received electric field strength of the radio wave from the communication partner. That is, this device instructs the increase / decrease of the transmission output of the communication partner in a state where the transmission power value of the communication partner, the antenna gain, and the separation distance from the communication partner are unknown.
  • This disclosure is a regulation imposed on a radio station by controlling the transmission power so that the electric field strength of the radio wave transmitted from the communication partner is less than the regulation allowed for the radio station by utilizing software defined radio technology.
  • the first object is to provide a wireless communication system that can satisfy the above.
  • a second object is to provide a transmission power control method that can satisfy the above-mentioned regulations.
  • the present disclosure is imposed on a radio station by utilizing software defined radio technology to control the transmission power so that the electric field strength of the radio wave transmitted from the communication partner is less than the specified value allowed for the radio station.
  • the third purpose is to provide a software defined radio that can satisfy the above regulations.
  • a fourth object is to provide a transmission power control program that can satisfy the above-mentioned regulations.
  • the first aspect is a hardware resource for wireless communication that can be reconfigured by changing software in order to achieve the above object, and a memory that stores software for making the hardware resource compatible with wireless communication.
  • a wireless communication system utilizing a software defined radio having a control unit for reconstructing the hardware resource using software stored in the memory and an antenna for exchanging and receiving radio signals, the software defined radio.
  • Stores the first memory area that stores the antenna gain information, which is the relationship between the antenna gain and the frequency, and the permissible value information, which is the relationship between the permissible value of the electric field strength and the frequency specified for the radio station.
  • the control unit includes a second memory area, and the control unit is satisfied with a selection process for selecting a communication method and a frequency band used for communication, and a process for forming a communication line using the communication method and the frequency band.
  • a gain read process for reading the gain G indicated by the antenna in the frequency band from the area, a process for reading the allowable value R in the frequency band from the second memory area, and a transmission power according to P R-G + L. It is desirable to execute the process of calculating the upper limit of P.
  • the second aspect is a hardware resource for wireless communication that can be reconfigured by changing the software, a memory that stores software for making the hardware resource compatible with wireless communication, and a memory that is stored in the memory. It is an electric field strength control method utilizing a software defined radio equipped with a control unit for reconstructing the hardware resource using the software defined radio and an antenna for exchanging and receiving radio signals, and is a relationship between the gain and frequency of the antenna.
  • a step of storing the antenna gain information which is As a position to measure the electric field strength to be compared with the allowable value R to be satisfied by the radio station, the step of selecting the communication method and frequency band used for communication, the step of configuring the communication line using the communication method and the frequency band, and the step.
  • the third aspect is a hardware resource for wireless communication that can be reconfigured by changing the software, a memory that stores software for making the hardware resource compatible with wireless communication, and a memory that is stored in the memory.
  • It is a software defined radio equipped with a control unit that reconfigures the hardware resource using the software defined radio, and an antenna that sends and receives radio signals, and stores antenna gain information that is the relationship between the gain and frequency of the antenna.
  • the first memory area is provided with a second memory area for storing the permissible value information which is the relationship between the permissible value of the electric field strength defined for the radio station and the frequency, and the control unit is used for communication.
  • the fourth aspect is a transmission power control program, and it is desirable that the computer includes a program for realizing the function of the software defined radio according to the third aspect.
  • the transmission power P can be set so that the electric field strength is equal to or less than the allowable value R imposed on the radio station for each frequency band to be used. Therefore, according to these aspects, it is possible to provide the user with high-quality communication while satisfying the provisions of the radio station.
  • FIG. 1 shows the permissible value of the electric field strength set by the Ministry of Internal Affairs and Communications of Japan for weak radio stations. Specifically, FIG. 1 defines that the permissible value of the electric field strength to be satisfied by the weak radio station is as follows. Frequency band below 322MHz: 500 ⁇ V / m Frequency band from 322MHz to 10GHz: 35 ⁇ V / m Frequency band from 10GHz to 150GHz: 35-500 ⁇ V / m Frequency band above 150GHz: 500 ⁇ V / m
  • a radio device whose electric field strength at a distance of 3 m is less than the above allowable value is permitted to be used as a weak radio station that does not require a license.
  • a wireless device capable of establishing communication using various frequency bands and reliably satisfying a requirement regarding an allowable value of a weak radio station in those plurality of frequency bands is disclosed.
  • FIG. 2 shows the configuration of the software defined radio 10 used in the wireless communication system of the first embodiment of the present disclosure. As shown in FIG. 2, the software defined radio 10 is connected to the antenna 12, and can perform wireless communication with another wireless device via the antenna 12.
  • the antenna 12 supports a wide band frequency and can send and receive radio signals in various frequency bands.
  • the antenna gain G generally varies depending on the frequency used for wireless communication.
  • the antenna 12 used in this embodiment also has a characteristic that the gain changes according to the frequency used.
  • the software defined radio 10 is equipped with hardware that can be reconfigured by software.
  • the communication method WiFi (registered trademark) method, LTE method, etc.
  • frequency band used for wireless communication can be changed by changing the software as necessary.
  • the software defined radio 10 includes an FPGA (Field Programmable Gate Array) 14.
  • the FPGA 14 is a device that can program various logic circuit configurations by rewriting software.
  • the FPGA 14 functions as a baseband processing unit that processes a baseband signal transmitted by communication.
  • the FPGA 14 may be replaced with a general computer or a DSP (Digital Signal Processor).
  • the software defined radio 10 includes an AD / DA converter 16 and an RF front end unit 18.
  • the AD / DA converter 16 and the RF front end portion 18 process high frequency signals between the antenna 12 and the FPGA 12.
  • the software defined radio 10 further includes a control unit 20.
  • the control unit 20 is provided with various interfaces and has a built-in CPU, memory, and the like.
  • the control unit 20 controls the FPGA 14, the AD / DA converter 16, and the RF front end unit 18 by proceeding with processing according to a program stored in the memory. Specifically, the control unit 20 detects a request for the software defined radio 10 and reconfigures the hardware corresponding to the request.
  • the software defined radio 10 can change the communication method by changing the software and reconfiguring the hardware resources.
  • the software defined radio 10 is configured with hardware corresponding to the three communication methods A to C.
  • the software defined radio 10 can also change the frequency band used for communication and the width of the frequency band.
  • three rectangular frames 22, 24, and 26 described as “communication method A” to “communication method C” are shown in the frame of the software defined radio 10. These rectangular frames 22, 24, and 26 represent the frequency band of the communication line configured in the software defined radio 10.
  • the positions of the rectangular frames 22, 24, and 26 in the vertical direction in the figure represent the height of the "frequency band”. Further, the vertical widths of the rectangular frames 22, 24, and 26 represent the "widths" of the respective frequency bands. That is, the three rectangular frames 22, 24, and 26 shown in FIG. 2 illustrate the following three events.
  • Communication lines 22, 24, and 26 are prepared in the software defined radio 10 by reconfiguring the hardware resources. Hereinafter, they are referred to as "communication lines 22, 24, 26" for convenience. 2. 2. The communication lines 22, 24, and 26 use different frequency bands, and the frequency bands are lowered in the order of communication lines 22 ⁇ 24 ⁇ 26. 3. 3. The frequency bandwidths of the communication lines 22, 24, and 26 are all the same.
  • the software defined radio 10 transmits data and voice signals supplied by wire from an external device or the like via the communication lines 22, 24, 26, and the radio signal received by the antenna 12 is transmitted through the communication lines 22, 24, 24. , 26 can be converted into data or audio signals.
  • the software defined radio 10 stores the antenna gain information 28 in the built-in memory.
  • the antenna gain information 28 includes the relationship between the gain G and the frequency for each of the plurality of antennas that are expected to be used.
  • the software defined radio 10 also stores the allowable value information 30 in the built-in memory.
  • the permissible value information 30 includes the permissible value information shown in FIG. 1, that is, the relationship between the permissible value of the electric field strength and the frequency at a distance of 3 m from the wireless device.
  • the software defined radio 10 of the present embodiment satisfies the conditions 1 to 12 described below.
  • the software defined radio 10 includes an input interface for enabling a user to input information. 2.
  • the user can specify a combination of communication methods and frequency bands via the input interface. When this designation is made, the software defined radio 10 constitutes a communication line corresponding to the designated communication method and frequency band. 3.
  • the user can specify the transmission capacity and transmission quality via the input interface. When this designation is made, the software defined radio 10 searches for a communication method and frequency band that embodies the designated transmission capacity and transmission quality, and constitutes a communication line corresponding to the result of the search.
  • the transmission power P for satisfying the condition of the weak radio station is calculated.
  • the formula used in the description of the present disclosure is a calculation formula in dB notation.
  • P R-G + L ...
  • the electric field strength R3 at a position 3 m away from the antenna 12 is a value obtained by subtracting the propagation loss L at the position of 3 m from the value obtained by adding the gain G to the transmission power P, and can be expressed by the following equation.
  • R3 P + G-L ... (2)
  • the above equation (1) can be obtained. Therefore, according to the above equation (1), the maximum transmission power P satisfying the condition of the weak radio station can be calculated.
  • FIG. 3 is a block diagram for explaining elements configured inside the software defined radio 10 shown in FIG. 2 in order to realize the above functions.
  • the software defined radio 10 includes a radio wave transmitting unit 32.
  • the radio wave transmission unit 32 modulates data or the like provided by wire from an external device or the like into a transmission signal and supplies the data or the like to the antenna 12 with the transmission power P.
  • the command of the transmission power P is given from the transmission power calculation unit 34 to the radio wave transmission unit 32.
  • the transmission power calculation unit 34 calculates the transmission power P by the following processing. 1. 1. From the antenna gain information 28, the gain G of the antenna 12 at the frequency used for communication is read out. 2. 2. From the permissible value information 30, the permissible value R of the electric field strength at the frequency used for communication is read out. From the 3.3 m propagation loss calculation unit 36, the propagation loss (hereinafter referred to as “3 m propagation loss L”) generated at a position 3 m away from the antenna 12 at the frequency used for communication is read out. 4. The transmission power P is calculated by substituting the allowable value R, the gain G, and the 3m propagation loss L into the above equation (1).
  • the 3m propagation loss calculation unit 36 calculates the 3m propagation loss L generated at the frequency used for communication according to the formula of the free space propagation loss.
  • the frequency used for communication is selected by the line information selection unit 38.
  • the line information selection unit 38 selects the conditions of the communication line used for wireless communication, specifically, the combination of the communication method and the frequency band used in the communication line.
  • the line information 40 is input to the line information selection unit 38 by the user. The user can directly input the combination of the communication method and the frequency band as the line information 40. In this case, the line information selection unit 38 selects the input communication method and frequency band as those to be used for communication.
  • the user can also input the transmission capacity and transmission quality as the line information 40 instead of the communication method and frequency band.
  • the line information selection unit 38 searches for a combination of a communication method and a frequency band that satisfy the input transmission capacity and transmission quality, and uses the communication method and frequency band obtained as a result of the search for communication. select. As a result, a communication line that meets the user's request for communication is set.
  • FIG. 4 is a flowchart of processing executed by the control unit 20 of the software defined radio 10 in order to realize each function shown in FIG.
  • the communication method and the frequency band used for communication are selected according to the line information 40 input by the user (step 100).
  • the gain G of the antenna 12 at the selected frequency is read from the antenna gain information 28 (step 102).
  • the 3m propagation loss L generated at a position 3m away from the antenna 12 is calculated for the radio signal having the selected frequency (step 104).
  • the permissible value R of the electric field strength recognized at the frequency used for communication is read out (step 106).
  • the transmission power P that makes the electric field strength at the 3 m position match the allowable value R, that is, the maximum transmission power P that satisfies the requirement of the weak radio station is calculated.
  • step 110 After the transmission power P is calculated, communication with the transmission power P is started on the communication line using the communication method and frequency band selected in step 100 (step 110).
  • the software defined radio 10 can appropriately configure a communication line that meets the user's request by rewriting the software. Then, the software defined radio 10 calculates the maximum transmission power P that satisfies the condition of the weak radio station in the frequency band of the communication line, and starts communication with the transmission power P. Therefore, according to the system of the present embodiment, it is possible to appropriately provide the communication of good quality required by the user while efficiently operating the software defined radio 10 as a weak radio station.
  • FIG. 5 is a diagram for explaining the configuration of the software defined radio 50 used in the wireless communication system of the present embodiment.
  • the same elements as those shown in FIG. 2 are designated by a common reference numeral, and the description thereof will be omitted or simplified.
  • the software defined radio 50 of this embodiment includes an antenna module 52.
  • the antenna module 52 corresponds to a wide band frequency like the antenna 12 of the first embodiment, and has a characteristic of showing a gain G according to the frequency.
  • the antenna module 52 has a built-in memory. In this memory, the relationship between the gain G of the antenna module 52 and the frequency is stored as the antenna gain information 54.
  • the software defined radio 50 is realized by the same hardware configuration as in the case of the software defined radio 10 of the first embodiment.
  • the antenna gain information 54 is transferred to the memory built in the software defined radio 50.
  • the information stored in the software defined radio 50 by this transfer is referred to as "antenna gain information 56".
  • the software defined radio 50 can detect the gain G indicated by the antenna module 52 at the frequency used for communication by referring to the antenna gain information 56.
  • FIG. 6 is a block diagram for explaining the main elements configured inside the software defined radio 50 shown in FIG.
  • the configuration shown in FIG. 6 is the same as the configuration shown in FIG. 3 except for the following three points. 1. 1. The point that the antenna 12 is changed to the antenna module 52, 2. 2. 2. The point where the antenna gain information 54 stored in the antenna module 52 is shown in the vicinity of the antenna module 52, and 3. The point that the antenna gain information 28 is replaced with the antenna gain information 56.
  • the same elements as those shown in FIG. 3 in FIG. 6 are designated by a common reference numeral, and the description thereof will be omitted or simplified.
  • the antenna gain information 56 is the one to which the antenna gain information 54 stored in the antenna module 52 has been transferred.
  • FIG. 7 is a flowchart of processing executed by the control unit 20 of the software defined radio 50 in order to realize the above functions.
  • the flowchart shown in FIG. 7 is similar to the flowchart shown in FIG. 4, except that step 102 is replaced by step 112.
  • step 102 is replaced by step 112.
  • FIG. 7 the same steps as those shown in FIG. 4 are designated by a common reference numeral, and the description thereof will be omitted or simplified.
  • the gain G of the antenna module 52 at the selected frequency is read from the antenna gain information 56 (step 112).
  • the software defined radio 50 of the present embodiment can calculate the maximum transmission power P allowed for the weak radio station, similarly to the software defined radio 10 of the first embodiment. Therefore, according to the wireless communication system of the present embodiment, as in the case of the first embodiment, the software defined radio 50 is efficiently operated as a weak wireless station, and the communication of good quality required by the user is appropriate. Can be provided to.
  • the target to which the calculation of the transmission power P is applied is limited to the weak radio station, but the present disclosure is not limited to this.
  • the technique according to the present disclosure can be widely applied not only to a weak radio station but also to a radio station where an allowable electric field strength is provided.
  • the user is given an option of inputting a combination of a communication method and a frequency band and an option of inputting a transmission capacity and a transmission quality, but the user can be provided with the option.
  • the options are not limited to these.
  • the input of only one of the communication method and the frequency band may be obtained, and the other may be determined so that the reference transmission capacity and transmission quality are satisfied.
  • the communication method and the frequency band may be searched by obtaining the input of only one of the transmission capacity and the transmission quality and applying the reference value to the other.
  • the software defined radios 10 and 50 start communication after calculating the transmission power P.
  • this function may be changed to a function that prohibits the start of communication until the transmission power P is determined.
  • the software defined radios 10 and 50 start communication with the transmission power P calculated in step 108, but the present disclosure is not limited to this.
  • the software defined radios 10 and 50 may use a smaller transmission power as long as the desired transmission quality can be obtained by positioning the transmission power P as the upper limit value of the transmission power used for communication.
  • the antenna gain information 54 stored in the memory of the antenna module 52 is transferred to the memory of the software defined radio 50, and the antenna gain information 56 stored in the software defined radio 50 is transmitted. It is used to calculate the power P.
  • the present disclosure is not limited to this, and the antenna gain information 54 stored in the antenna module 52 may be used for the calculation of the direct transmission power P.

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Abstract

The present invention utilizes a software wireless device for which hardware resource reconfiguration is possible via software changes. The software wireless device comprises: a first memory region that stores antenna gain information which is the relation between antenna gain and frequency; and a second memory region that stores tolerance value information which is the relation between frequency and tolerance values for electric field intensity stipulated for weak radio stations. A frequency band and communication method to be used for communication are selected (step 100), and a communication line using these is configured. Gain G exhibited by an antenna in the frequency band is read from the first memory region (step 102). The 3 m propagation loss L occurring in the frequency band at a position 3 m away from a weak radio station is calculated (step 104). The tolerance value R for the frequency band is read from the second memory region (step 106). The upper limit value of transmission power P is calculated in accordance with P=R-G+L (step 108).

Description

無線通信システム、電界強度制御方法、ソフトウェア無線機、および電界強度制御用プログラムWireless communication system, electric field strength control method, software defined radio, and program for electric field strength control
　この開示は、無線通信システム、電界強度制御方法、ソフトウェア無線機、および電界強度制御用プログラムに係り、特に、微弱無線局の規定を満足するように電界強度を制御する上で好適な無線通信システム、電界強度制御方法、ソフトウェア無線機、および電界強度制御用プログラムに関する。 This disclosure relates to wireless communication systems, electric field strength control methods, software defined radios, and electric field strength control programs, and is particularly suitable for controlling electric field strength so as to satisfy the provisions of weak radio stations. , Field strength control methods, software defined radios, and field strength control programs.
　特許文献１には、通信相手の電力消費の無駄を抑制できる無線通信装置が開示されている。この装置は、通信相手から受信した電波の電界強度を検出し、その値が予め設定されている基準範囲内にあるかを判定する。また、この装置は、相手方から受信する電波の電界強度が基準範囲内に収まるように、通信相手に対して送信出力の変更を指示する。その結果、特許文献１に記載の装置は、通信に用いられる電波の電界強度を制御可能なシステムを実現している。 Patent Document 1 discloses a wireless communication device capable of suppressing wasteful power consumption of a communication partner. This device detects the electric field strength of the radio wave received from the communication partner and determines whether the value is within the preset reference range. In addition, this device instructs the communication partner to change the transmission output so that the electric field strength of the radio wave received from the other party is within the reference range. As a result, the device described in Patent Document 1 realizes a system capable of controlling the electric field strength of radio waves used for communication.
日本特開２００７－２５９０５５号公報Japanese Patent Application Laid-Open No. 2007-259555
　日本国においては、無線装置を、無線局としての届出が不要な微弱無線局として用いる場合、無線装置から３ｍの距離における電界強度を、総務省の規定により定められている許容値以下に抑える必要がある。 In Japan, when using a wireless device as a weak wireless station that does not require notification as a wireless station, it is necessary to keep the electric field strength at a distance of 3 m from the wireless device below the permissible value set by the regulations of the Ministry of Internal Affairs and Communications. There is.
　特許文献１に記載の装置は、通信相手からの電波の受信電界強度に応じて、送信出力の変更を指示する。つまり、この装置は、通信相手の送信電力値、アンテナ利得、および通信相手との離隔距離が不明な状態で、通信相手の送信出力の増減を指示する。 The device described in Patent Document 1 instructs to change the transmission output according to the received electric field strength of the radio wave from the communication partner. That is, this device instructs the increase / decrease of the transmission output of the communication partner in a state where the transmission power value of the communication partner, the antenna gain, and the separation distance from the communication partner are unknown.
　この場合、通信相手の送信電力値そのものは、制御の対象とならず、必然的に、その通信相手から３ｍ離れた位置での電界強度も制御の対象とはならない。このため、特許文献１に記載の技術を微弱無線局に適用した場合、通信相手から送出される電波の電界強度を、微弱無線局に許容される電界強度の許容値以下に確実に収めることはできない。 In this case, the transmission power value itself of the communication partner is not subject to control, and inevitably, the electric field strength at a position 3 m away from the communication partner is not subject to control. Therefore, when the technique described in Patent Document 1 is applied to a weak radio station, the electric field strength of the radio wave transmitted from the communication partner cannot be surely kept below the permissible value of the electric field strength allowed for the weak radio station. Can not.
　本開示は、ソフトウェア無線技術を活用して、通信相手から送出される電波の電界強度が無線局に許容される規定以下となるように送信電力を制御することで、無線局に課された規定を満足させ得る無線通信システムを提供することを第１の目的とする。 This disclosure is a regulation imposed on a radio station by controlling the transmission power so that the electric field strength of the radio wave transmitted from the communication partner is less than the regulation allowed for the radio station by utilizing software defined radio technology. The first object is to provide a wireless communication system that can satisfy the above.
　また、本開示は、ソフトウェア無線技術を活用して、通信相手から送出される電波の電界強度が無線局に許容される規定以下となるように送信電力を制御することで、無線局に課された規定を満足させ得る送信電力制御方法を提供することを第２の目的とする。 In addition, the present disclosure is imposed on a radio station by utilizing software defined radio technology to control the transmission power so that the electric field strength of the radio wave transmitted from the communication partner is less than the specified value allowed for the radio station. A second object is to provide a transmission power control method that can satisfy the above-mentioned regulations.
　また、本開示は、ソフトウェア無線技術を活用して、通信相手から送出される電波の電界強度が無線局に許容される規定以下となるように送信電力を制御することで、無線局に課された規定を満足させ得るソフトウェア無線機を提供することを第３の目的とする。 Further, the present disclosure is imposed on a radio station by utilizing software defined radio technology to control the transmission power so that the electric field strength of the radio wave transmitted from the communication partner is less than the specified value allowed for the radio station. The third purpose is to provide a software defined radio that can satisfy the above regulations.
　また、本開示は、ソフトウェア無線技術を活用して、通信相手から送出される電波の電界強度が無線局に許容される規定以下となるように送信電力を制御することで、無線局に課された規定を満足させ得る送信電力制御用プログラムを提供することを第４の目的とする。 Further, the present disclosure is imposed on a radio station by utilizing software defined radio technology to control the transmission power so that the electric field strength of the radio wave transmitted from the communication partner is less than the specified value allowed for the radio station. A fourth object is to provide a transmission power control program that can satisfy the above-mentioned regulations.
　第１の態様は、上記の目的を達成するため、ソフトウェアの変更により再構成が可能な無線通信用のハードウェアリソースと、前記ハードウェアリソースを無線通信に対応させるためのソフトウェアを格納したメモリと、前記メモリに格納されているソフトウェアを用いて前記ハードウェアリソースを再構成する制御部と、無線信号を授受するアンテナとを備えるソフトウェア無線機を活用した無線通信システムであって、前記ソフトウェア無線機は、前記アンテナの利得と周波数との関係であるアンテナ利得情報を記憶した第１のメモリ領域と、無線局について規定された電界強度の許容値と周波数との関係である許容値情報を記憶した第２のメモリ領域とを備え、前記制御部は、通信に用いる通信方式および周波数帯を選択する選択処理と、前記通信方式および前記周波数帯を用いる通信回線を構成する処理と、無線局が満たすべき許容値Rと比較する電界強度を測定すべき位置として規定されている距離だけ前記アンテナから離れた位置で、前記周波数帯において生ずる規定距離伝搬損失Lを算出する処理と、前記第１のメモリ領域から、前記アンテナが前記周波数帯で示す利得Gを読み出す利得読み出し処理と、前記第２のメモリ領域から、前記周波数帯における許容値Rを読み出す処理と、P ＝ R － G ＋ L　に従って送信電力Pの上限値を算出する処理と、を実行することが望ましい。 The first aspect is a hardware resource for wireless communication that can be reconfigured by changing software in order to achieve the above object, and a memory that stores software for making the hardware resource compatible with wireless communication. A wireless communication system utilizing a software defined radio having a control unit for reconstructing the hardware resource using software stored in the memory and an antenna for exchanging and receiving radio signals, the software defined radio. Stores the first memory area that stores the antenna gain information, which is the relationship between the antenna gain and the frequency, and the permissible value information, which is the relationship between the permissible value of the electric field strength and the frequency specified for the radio station. The control unit includes a second memory area, and the control unit is satisfied with a selection process for selecting a communication method and a frequency band used for communication, and a process for forming a communication line using the communication method and the frequency band. The process of calculating the specified distance propagation loss L generated in the frequency band at a position separated from the antenna by the distance specified as the position where the electric field strength to be compared with the allowable value R should be measured, and the first memory. A gain read process for reading the gain G indicated by the antenna in the frequency band from the area, a process for reading the allowable value R in the frequency band from the second memory area, and a transmission power according to P = R-G + L. It is desirable to execute the process of calculating the upper limit of P.
　また、第２の態様は、ソフトウェアの変更により再構成が可能な無線通信用のハードウェアリソースと、前記ハードウェアリソースを無線通信に対応させるためのソフトウェアを格納したメモリと、前記メモリに格納されているソフトウェアを用いて前記ハードウェアリソースを再構成する制御部と、無線信号を授受するアンテナとを備えるソフトウェア無線機を活用した電界強度制御方法であって、前記アンテナの利得と周波数との関係であるアンテナ利得情報を第１のメモリ領域に格納するステップと、無線局について規定された電界強度の許容値と周波数との関係である許容値情報を第２のメモリ領域に格納するステップと、通信に用いる通信方式および周波数帯を選択するステップと、前記通信方式および前記周波数帯を用いる通信回線を構成するステップと、無線局が満たすべき許容値Rと比較する電界強度を測定すべき位置として規定されている距離だけ前記アンテナから離れた位置で、前記周波数帯において生ずる規定距離伝搬損失Lを算出するステップと、前記第１のメモリ領域から、前記アンテナが前記周波数帯で示す利得Gを読み出すステップと、前記第２のメモリ領域から、前記周波数帯における許容値Rを読み出すステップと、P ＝ R － G ＋ L　に従って送信電力Pの上限値を算出するステップと、を含むことが望ましい。 The second aspect is a hardware resource for wireless communication that can be reconfigured by changing the software, a memory that stores software for making the hardware resource compatible with wireless communication, and a memory that is stored in the memory. It is an electric field strength control method utilizing a software defined radio equipped with a control unit for reconstructing the hardware resource using the software defined radio and an antenna for exchanging and receiving radio signals, and is a relationship between the gain and frequency of the antenna. A step of storing the antenna gain information, which is As a position to measure the electric field strength to be compared with the allowable value R to be satisfied by the radio station, the step of selecting the communication method and frequency band used for communication, the step of configuring the communication line using the communication method and the frequency band, and the step. From the step of calculating the specified distance propagation loss L generated in the frequency band at a position separated from the antenna by a specified distance and the first memory area, the gain G indicated by the antenna in the frequency band is read out. It is desirable to include a step, a step of reading the allowable value R in the frequency band from the second memory area, and a step of calculating the upper limit value of the transmission power P according to P = R-G + L.
　また、第３の態様は、ソフトウェアの変更により再構成が可能な無線通信用のハードウェアリソースと、前記ハードウェアリソースを無線通信に対応させるためのソフトウェアを格納したメモリと、前記メモリに格納されているソフトウェアを用いて前記ハードウェアリソースを再構成する制御部と、無線信号を授受するアンテナとを備えるソフトウェア無線機であって、前記アンテナの利得と周波数との関係であるアンテナ利得情報を記憶した第１のメモリ領域と、無線局について規定された電界強度の許容値と周波数との関係である許容値情報を記憶した第２のメモリ領域とを備え、前記制御部は、通信に用いる通信方式および周波数帯を選択する選択処理と、前記通信方式および前記周波数帯を用いる通信回線を構成する処理と、無線局が満たすべき許容値Rと比較する電界強度を測定すべき位置として規定されている距離だけ前記アンテナから離れた位置で、前記周波数帯において生ずる規定距離伝搬損失Lを算出する処理と、前記第１のメモリ領域から、前記アンテナが前記周波数帯で示す利得Gを読み出す利得読み出し処理と、前記第２のメモリ領域から、前記周波数帯における許容値Rを読み出す処理と、P ＝ R － G ＋ L　に従って送信電力Pの上限値を算出する処理と、を実行することが望ましい。 The third aspect is a hardware resource for wireless communication that can be reconfigured by changing the software, a memory that stores software for making the hardware resource compatible with wireless communication, and a memory that is stored in the memory. It is a software defined radio equipped with a control unit that reconfigures the hardware resource using the software defined radio, and an antenna that sends and receives radio signals, and stores antenna gain information that is the relationship between the gain and frequency of the antenna. The first memory area is provided with a second memory area for storing the permissible value information which is the relationship between the permissible value of the electric field strength defined for the radio station and the frequency, and the control unit is used for communication. It is defined as a position to measure the electric field strength to be compared with the selection process for selecting the method and frequency band, the process for constituting the communication line using the communication method and the frequency band, and the allowable value R to be satisfied by the radio station. Processing to calculate the specified distance propagation loss L generated in the frequency band at a position separated from the antenna by a certain distance, and gain reading processing to read the gain G indicated by the antenna in the frequency band from the first memory area. It is desirable to execute the process of reading the allowable value R in the frequency band from the second memory area and the process of calculating the upper limit value of the transmission power P according to P = R-G + L.
　また、第４の態様は、送信電力制御用プログラムであって、コンピュータに、第３の態様に係るソフトウェア無線機の機能を実現させるためのプログラムを含むことが望ましい。 Further, the fourth aspect is a transmission power control program, and it is desirable that the computer includes a program for realizing the function of the software defined radio according to the third aspect.
　第１乃至第４の態様によれば、ソフトウェア無線技術を活用して、様々な通信方式および周波数帯を活用して良好な通信をユーザに提供することができる。そして、使用する周波数帯毎に、電界強度が無線局に課された許容値R以下となるように送信電力Pを設定することができる。このため、これらの態様によれば、無線局の規定を満足させながら、質の高い通信をユーザに提供することができる。 According to the first to fourth aspects, it is possible to utilize software defined radio technology to provide users with good communication by utilizing various communication methods and frequency bands. Then, the transmission power P can be set so that the electric field strength is equal to or less than the allowable value R imposed on the radio station for each frequency band to be used. Therefore, according to these aspects, it is possible to provide the user with high-quality communication while satisfying the provisions of the radio station.
日本国総務省が微弱無線局について定めている電界強度の許容値を示す。Shows the permissible value of electric field strength set by the Ministry of Internal Affairs and Communications of Japan for weak radio stations. 本開示の実施の形態１のソフトウェア無線機の構成を示す図である。It is a figure which shows the structure of the software defined radio of Embodiment 1 of this disclosure. 図２に示すソフトウェア無線機の内部に構成される要素を説明するためのブロック図である。It is a block diagram for demonstrating the element which is made inside the software defined radio shown in FIG. 図３に示すソフトウェア無線機で実行される処理の内容を説明するためのフローチャートである。It is a flowchart for demonstrating the content of the process executed by the software defined radio shown in FIG. 本開示の実施の形態２のソフトウェア無線機の構成を示す図である。It is a figure which shows the structure of the software defined radio of Embodiment 2 of this disclosure. 図５に示すソフトウェア無線機の内部に構成される要素を説明するためのブロック図である。It is a block diagram for demonstrating the element which is made inside the software defined radio shown in FIG. 図６に示すソフトウェア無線機で実行される処理の内容を説明するためのフローチャートである。It is a flowchart for demonstrating the content of the process executed by the software defined radio shown in FIG.
実施の形態１．
［微弱無線局］
　図１は、日本国総務省が微弱無線局について定めている電界強度の許容値を示す。図１は、具体的には、微弱無線局が満たすべき電界強度の許容値が以下の通りであることを定めている。
　　　３２２MHz以下の周波数帯：５００μV/m
　　　３２２MHzから１０GHzまでの周波数帯：３５μV/m
　　　１０GHｚから１５０ＧＨｚまでの周波数帯：３５～５００μV/m
　　　１５０GHz以上の周波数帯：５００μV/m Embodiment 1.
[Weak radio station]
FIG. 1 shows the permissible value of the electric field strength set by the Ministry of Internal Affairs and Communications of Japan for weak radio stations. Specifically, FIG. 1 defines that the permissible value of the electric field strength to be satisfied by the weak radio station is as follows.
Frequency band below 322MHz: 500μV / m
Frequency band from 322MHz to 10GHz: 35μV / m
Frequency band from 10GHz to 150GHz: 35-500μV / m
Frequency band above 150GHz: 500μV / m
　日本国では、３ｍ離れた位置における電界強度が上記の許容値以下である無線装置は、免許が不要な微弱無線局として使用することが認められている。本実施形態では、様々な周波数帯を利用した通信を確立することができ、かつ、それら複数の周波数帯において、微弱無線局の許容値に関する要求を確実に満たすことのできる無線装置を開示する。 In Japan, a radio device whose electric field strength at a distance of 3 m is less than the above allowable value is permitted to be used as a weak radio station that does not require a license. In the present embodiment, a wireless device capable of establishing communication using various frequency bands and reliably satisfying a requirement regarding an allowable value of a weak radio station in those plurality of frequency bands is disclosed.
［実施の形態１の構成］
　図２は、本開示の実施の形態１の無線通信システムに使用するソフトウェア無線機１０の構成を示す。図２に示すように、ソフトウェア無線機１０はアンテナ１２に接続されており、アンテナ１２を介して他の無線装置と無線通信を行うことができる。 [Structure of Embodiment 1]
FIG. 2 shows the configuration of the software defined radio 10 used in the wireless communication system of the first embodiment of the present disclosure. As shown in FIG. 2, the software defined radio 10 is connected to the antenna 12, and can perform wireless communication with another wireless device via the antenna 12.
　アンテナ１２は、広帯域の周波数に対応しており、様々な周波数帯で無線信号を授受することができる。アンテナ利得Gは、一般に無線通信に使用する周波数に応じて変化する。本実施形態で用いるアンテナ１２も、使用する周波数に応じて利得が変化する特性を有している。 The antenna 12 supports a wide band frequency and can send and receive radio signals in various frequency bands. The antenna gain G generally varies depending on the frequency used for wireless communication. The antenna 12 used in this embodiment also has a characteristic that the gain changes according to the frequency used.
　ソフトウェア無線機１０は、ソフトウェアによって再構成が可能なハードウェアを備えている。本実施形態では、必要に応じてソフトウェアを変更することにより、無線通信に利用する通信方式（WiFi（登録商標）方式、LTE方式等）および周波数帯を変更することができる。 The software defined radio 10 is equipped with hardware that can be reconfigured by software. In the present embodiment, the communication method (WiFi (registered trademark) method, LTE method, etc.) and frequency band used for wireless communication can be changed by changing the software as necessary.
　図２に示すように、ソフトウェア無線機１０は、FPGA（Field Programmable Gate Array）１４を備えている。FPGA１４は、ソフトウェアの書き換えにより、様々な論理回路の構成をプログラムできるデバイスである。ソフトウェア無線機１０において、FPGA１４は、通信により伝送されるベースバンド信号を処理するベースバンド処理部として機能する。FPGA１４は、一般的なコンピュータやDSP（Digital Signal Processor）に置き換えてもよい。 As shown in FIG. 2, the software defined radio 10 includes an FPGA (Field Programmable Gate Array) 14. The FPGA 14 is a device that can program various logic circuit configurations by rewriting software. In the software defined radio 10, the FPGA 14 functions as a baseband processing unit that processes a baseband signal transmitted by communication. The FPGA 14 may be replaced with a general computer or a DSP (Digital Signal Processor).
　ソフトウェア無線機１０は、AD/DAコンバータ１６、並びにRFフロントエンド部１８を備えている。AD/DAコンバータ１６およびRFフロントエンド部１８は、アンテナ１２とFPGA１２との間で高周波信号を処理する。 The software defined radio 10 includes an AD / DA converter 16 and an RF front end unit 18. The AD / DA converter 16 and the RF front end portion 18 process high frequency signals between the antenna 12 and the FPGA 12.
　ソフトウェア無線機１０は、更に、制御部２０を備えている。制御部２０は、各種のインターフェースを備えると共にCPU、メモリ等を内蔵している。制御部２０は、メモリ内に格納されているプログラムに沿って処理を進めることにより、FPGA１４、AD/DAコンバータ１６、およびRFフロントエンド部１８を制御する。制御部２０は、具体的には、ソフトウェア無線機１０に対する要求を検知し、その要求に対応するハードウェアの再構成等を行う。 The software defined radio 10 further includes a control unit 20. The control unit 20 is provided with various interfaces and has a built-in CPU, memory, and the like. The control unit 20 controls the FPGA 14, the AD / DA converter 16, and the RF front end unit 18 by proceeding with processing according to a program stored in the memory. Specifically, the control unit 20 detects a request for the software defined radio 10 and reconfigures the hardware corresponding to the request.
　ソフトウェア無線機１０は、ソフトウェアを変更してハードウェアリソースを再構成することにより、通信方式を変更することができる。図２に示す例では、ソフトウェア無線機１０に、三つの通信方式A～Cに対応するハードウェアが構成されている。 The software defined radio 10 can change the communication method by changing the software and reconfiguring the hardware resources. In the example shown in FIG. 2, the software defined radio 10 is configured with hardware corresponding to the three communication methods A to C.
　ソフトウェア無線機１０は、また、通信に使用する周波数帯や、周波数帯の幅を変更することができる。図２に示す例では、ソフトウェア無線機１０の枠内に、「通信方式A」～「通信方式C」と記された三つの矩形枠２２、２４、２６が示されている。これらの矩形枠２２、２４、２６は、ソフトウェア無線機１０内に構成された通信回線の周波数帯を表している。 The software defined radio 10 can also change the frequency band used for communication and the width of the frequency band. In the example shown in FIG. 2, three rectangular frames 22, 24, and 26 described as "communication method A" to "communication method C" are shown in the frame of the software defined radio 10. These rectangular frames 22, 24, and 26 represent the frequency band of the communication line configured in the software defined radio 10.
　具体的には、矩形枠２２、２４、２６の図中上下方向の位置は、「周波数帯」の高低を表している。また、矩形枠２２、２４、２６の上下幅は、夫々の周波数帯の「幅」を表してる。つまり、図２に示す三つの矩形枠２２、２４、２６は、以下の三つの事象を図示している。 Specifically, the positions of the rectangular frames 22, 24, and 26 in the vertical direction in the figure represent the height of the "frequency band". Further, the vertical widths of the rectangular frames 22, 24, and 26 represent the "widths" of the respective frequency bands. That is, the three rectangular frames 22, 24, and 26 shown in FIG. 2 illustrate the following three events.
　１．ソフトウェア無線機１０内に、ハードウェアリソースの再構成により、矩形枠２２、２４、２６の夫々に対応する三つの通信回線が準備されていること。以下、便宜上それらを「通信回線２２、２４、２６」と称する。
　２．通信回線２２、２４、２６は、夫々異なる周波数帯を用いており、その周波数帯は、通信回線２２→２４→２６の順で低くなること。
　３．通信回線２２、２４、２６の周波数帯幅は、全て同じであること。 1. 1. Three communication lines corresponding to the rectangular frames 22, 24, and 26 are prepared in the software defined radio 10 by reconfiguring the hardware resources. Hereinafter, they are referred to as " communication lines 22, 24, 26" for convenience.
2. 2. The communication lines 22, 24, and 26 use different frequency bands, and the frequency bands are lowered in the order of communication lines 22 → 24 → 26.
3. 3. The frequency bandwidths of the communication lines 22, 24, and 26 are all the same.
　ソフトウェア無線機１０は、外部の機器等から有線で供給されるデータや音声信号を、通信回線２２，２４，２６を介して送信し、また、アンテナ１２が受信した無線信号を通信回線２２，２４，２６を介してデータや音声信号に変換することができる。 The software defined radio 10 transmits data and voice signals supplied by wire from an external device or the like via the communication lines 22, 24, 26, and the radio signal received by the antenna 12 is transmitted through the communication lines 22, 24, 24. , 26 can be converted into data or audio signals.
　ソフトウェア無線機１０は、内蔵するメモリに、アンテナ利得情報２８を格納している。アンテナ利得情報２８には、使用が想定されている複数のアンテナ夫々についての、利得Gと周波数との関係が含まれている。 The software defined radio 10 stores the antenna gain information 28 in the built-in memory. The antenna gain information 28 includes the relationship between the gain G and the frequency for each of the plurality of antennas that are expected to be used.
　ソフトウェア無線機１０は、また、内蔵するメモリに、許容値情報３０を格納している。許容値情報３０には、図１に示す許容値の情報、つまり、無線装置から３ｍの距離における電界強度の許容値と周波数との関係が含まれている。 The software defined radio 10 also stores the allowable value information 30 in the built-in memory. The permissible value information 30 includes the permissible value information shown in FIG. 1, that is, the relationship between the permissible value of the electric field strength and the frequency at a distance of 3 m from the wireless device.
［実施の形態１の特徴］
　ソフトウェア無線機１０を微弱無線局として使用するためには、アンテナ１２から３ｍ離れた位置での電界強度を、図１に示す許容値以下に抑える必要がある。アンテナ１２の利得は、上記の通り通信に用いる周波数によって変化する。また、３ｍ距離での電界強度は、アンテナ１２の利得によって変化する。このため、様々な周波数帯で、微弱無線局として許容される最大出力を得るためには、通信に用いる周波数に応じて送信出力を適宜変化させる必要がある。 [Characteristics of Embodiment 1]
In order to use the software defined radio 10 as a weak radio station, it is necessary to suppress the electric field strength at a position 3 m away from the antenna 12 to be equal to or less than the allowable value shown in FIG. The gain of the antenna 12 changes depending on the frequency used for communication as described above. Further, the electric field strength at a distance of 3 m changes depending on the gain of the antenna 12. Therefore, in order to obtain the maximum output permitted as a weak radio station in various frequency bands, it is necessary to appropriately change the transmission output according to the frequency used for communication.
　上記の要求を満たすために、本実施形態のソフトウェア無線機１０は、以下に記す１～１２の条件を満たす。
　１．ソフトウェア無線機１０は、ユーザによる情報入力を可能とするための入力インターフェースを備える。
　２．ユーザは、入力インターフェースを介して、通信方式および周波数帯の組合せを指定することができる。この指定がなされた場合、ソフトウェア無線機１０は、指定された通信方式および周波数帯に対応する通信回線を構成する。
　３．ユーザは、入力インターフェースを介して、伝送容量および伝送品質を指定することができる。この指定がなされた場合、ソフトウェア無線機１０は、指定された伝送容量および伝送品質を具現化する通信方式および周波数帯を探索し、探索の結果に対応する通信回線を構成する。 In order to satisfy the above requirements, the software defined radio 10 of the present embodiment satisfies the conditions 1 to 12 described below.
1. 1. The software defined radio 10 includes an input interface for enabling a user to input information.
2. 2. The user can specify a combination of communication methods and frequency bands via the input interface. When this designation is made, the software defined radio 10 constitutes a communication line corresponding to the designated communication method and frequency band.
3. 3. The user can specify the transmission capacity and transmission quality via the input interface. When this designation is made, the software defined radio 10 searches for a communication method and frequency band that embodies the designated transmission capacity and transmission quality, and constitutes a communication line corresponding to the result of the search.
　４．アンテナ利得情報２８から、ソフトウェア無線機１０に装着されたアンテナ１２に関する利得Gの情報を抽出し、更に、その情報を参照して、通信に使用される周波数に対してアンテナ１２が示す利得Gを読み出す。
　５．通信に使用される周波数においてアンテナ１２から３ｍ離れた位置で生ずる伝搬損失Lを、公知の自由空間伝搬損失の式に従って算出する。
　６．許容値情報３０から、通信に使用される周波数における電界強度の許容値Rを読み出す。 4. From the antenna gain information 28, information on the gain G regarding the antenna 12 mounted on the software defined radio 10 is extracted, and further, with reference to the information, the gain G indicated by the antenna 12 with respect to the frequency used for communication is obtained. read out.
5. The propagation loss L generated at a position 3 m away from the antenna 12 at the frequency used for communication is calculated according to a known free space propagation loss equation.
6. From the permissible value information 30, the permissible value R of the electric field strength at the frequency used for communication is read out.
　７．以下の関係式に基づいて、微弱無線局の条件を満たすための送信電力Pを算出する。尚、本開示の説明に用いる式はdB表記による計算式である。
　　　　　　　P ＝ R － G ＋ L　　　・・・（１）
　アンテナ１２から３ｍ離れた位置での電界強度R3は、送信電力Pに利得Gを加えた値から、３ｍの位置での伝搬損失Lを減じた値であるから、次式で表すことができる。
　　　　　　　R3 ＝ P ＋ G － L 　　・・・（２）
　微弱無線局としての条件を満たすためには、R3をR以下に抑える必要がある。そして、R3をRに入れ替えて上記（２）式をPについて整理すると、上記（１）式が得られる。従って、上記（１）式によれば、微弱無線局の条件を満たす最大の送信電力Pを算出することができる。 7. Based on the following relational expression, the transmission power P for satisfying the condition of the weak radio station is calculated. The formula used in the description of the present disclosure is a calculation formula in dB notation.
P = R-G + L ... (1)
The electric field strength R3 at a position 3 m away from the antenna 12 is a value obtained by subtracting the propagation loss L at the position of 3 m from the value obtained by adding the gain G to the transmission power P, and can be expressed by the following equation.
R3 = P + G-L ... (2)
In order to satisfy the conditions as a weak radio station, it is necessary to suppress R3 to R or less. Then, by replacing R3 with R and rearranging the above equation (2) with respect to P, the above equation (1) can be obtained. Therefore, according to the above equation (1), the maximum transmission power P satisfying the condition of the weak radio station can be calculated.
　８．微弱無線局の条件を満たす送信電力Pが算出されたら、その計算の前提である通信方式および周波数帯を用いて通信を実施する。 8. When the transmission power P that satisfies the conditions of the weak radio station is calculated, communication is performed using the communication method and frequency band that are the premise of the calculation.
［実施の形態１の具体的構成］
　図３は、上記の機能を実現するために図２に示すソフトウェア無線機１０の内部に構成される要素を説明するためのブロック図である。
　図３に示すように、ソフトウェア無線機１０は、電波送信部３２を備えている。電波送信部３２は、外部機器等から有線で提供されるデータ等を、送信信号に変調して送信電力Pでアンテナ１２に供給する。 [Specific configuration of embodiment 1]
FIG. 3 is a block diagram for explaining elements configured inside the software defined radio 10 shown in FIG. 2 in order to realize the above functions.
As shown in FIG. 3, the software defined radio 10 includes a radio wave transmitting unit 32. The radio wave transmission unit 32 modulates data or the like provided by wire from an external device or the like into a transmission signal and supplies the data or the like to the antenna 12 with the transmission power P.
　送信電力Pの指令は、送信電力算出部３４から電波送信部３２に与えられる。送信電力算出部３４は、以下の処理により送信電力Pを算出する。
　１．アンテナ利得情報２８から、通信に使用する周波数でのアンテナ１２の利得Gを読み出す。
　２．許容値情報３０から、通信に使用する周波数における電界強度の許容値Rを読み出す。
　３．３ｍ伝搬損失算出部３６から、通信に使用する周波数で、アンテナ１２から３ｍ離れた位置において生ずる伝搬損失（以下、「３ｍ伝搬損失L」とする）を読み出す。
　４．上記（１）式に、許容値R、利得G、３ｍ伝搬損失Lを代入して、送信電力Pを算出する。 The command of the transmission power P is given from the transmission power calculation unit 34 to the radio wave transmission unit 32. The transmission power calculation unit 34 calculates the transmission power P by the following processing.
1. 1. From the antenna gain information 28, the gain G of the antenna 12 at the frequency used for communication is read out.
2. 2. From the permissible value information 30, the permissible value R of the electric field strength at the frequency used for communication is read out.
From the 3.3 m propagation loss calculation unit 36, the propagation loss (hereinafter referred to as “3 m propagation loss L”) generated at a position 3 m away from the antenna 12 at the frequency used for communication is read out.
4. The transmission power P is calculated by substituting the allowable value R, the gain G, and the 3m propagation loss L into the above equation (1).
　３ｍ伝搬損失算出部３６は、自由空間伝搬損失の式に従って、通信に使用する周波数で生ずる３ｍ伝搬損失Lを算出する。 The 3m propagation loss calculation unit 36 calculates the 3m propagation loss L generated at the frequency used for communication according to the formula of the free space propagation loss.
　通信に使用する周波数は、回線情報選択部３８において選択される。回線情報選択部３８は、無線通信に用いる通信回線の条件、具体的には、その通信回線で用いる通信方式および周波数帯の組み合わせを選択する。回線情報選択部３８には、ユーザにより回線情報４０が入力される。ユーザは、回線情報４０として、通信方式と周波数帯との組み合わせを直接入力することができる。この場合、回線情報選択部３８は、入力された通信方法および周波数帯を、通信に使用するものとして選択する。 The frequency used for communication is selected by the line information selection unit 38. The line information selection unit 38 selects the conditions of the communication line used for wireless communication, specifically, the combination of the communication method and the frequency band used in the communication line. The line information 40 is input to the line information selection unit 38 by the user. The user can directly input the combination of the communication method and the frequency band as the line information 40. In this case, the line information selection unit 38 selects the input communication method and frequency band as those to be used for communication.
　ユーザは、また、通信方式や周波数帯に代えて、伝送容量や伝送品質を回線情報４０として入力することもできる。この場合、回線情報選択部３８は、入力された伝送容量や伝送品質を満たす通信方式と周波数帯との組み合わせを探索し、探索の結果得られた通信方式および周波数帯を、通信に用いるものとして選択する。これにより、通信に対するユーザの要求に応える通信回線が設定される。 The user can also input the transmission capacity and transmission quality as the line information 40 instead of the communication method and frequency band. In this case, the line information selection unit 38 searches for a combination of a communication method and a frequency band that satisfy the input transmission capacity and transmission quality, and uses the communication method and frequency band obtained as a result of the search for communication. select. As a result, a communication line that meets the user's request for communication is set.
　図４は、図３に示す各機能を実現させるためにソフトウェア無線機１０の制御部２０において実行される処理のフローチャートである。図３に示すルーチンでは、先ず、ユーザにより入力された回線情報４０に従って、通信方式と、通信に用いる周波数帯とが選択される（ステップ１００）。 FIG. 4 is a flowchart of processing executed by the control unit 20 of the software defined radio 10 in order to realize each function shown in FIG. In the routine shown in FIG. 3, first, the communication method and the frequency band used for communication are selected according to the line information 40 input by the user (step 100).
　次に、選択された周波数におけるアンテナ１２の利得Gが、アンテナ利得情報２８から読み出される（ステップ１０２）。 Next, the gain G of the antenna 12 at the selected frequency is read from the antenna gain information 28 (step 102).
　次いで、選択された周波数を持つ無線信号に、アンテナ１２から３ｍ離れた位置で生ずる３ｍ伝搬損失Lが算出される（ステップ１０４）。 Next, the 3m propagation loss L generated at a position 3m away from the antenna 12 is calculated for the radio signal having the selected frequency (step 104).
　更に、許容値情報３０から、通信に用いられる周波数で認められている電界強度の許容値Rが読み出される（ステップ１０６）。 Further, from the permissible value information 30, the permissible value R of the electric field strength recognized at the frequency used for communication is read out (step 106).
　以上の処理が終わると、上記（１）式に従って、送信電力P（＝R－G＋L）が算出される（ステップ１０８）。これにより、３ｍ位置での電界強度を許容値Rと一致させる送信電力P、つまり微弱無線局の要求を満たす最大の送信電力Pが算出される。 When the above processing is completed, the transmission power P (= RG + L) is calculated according to the above equation (1) (step 108). As a result, the transmission power P that makes the electric field strength at the 3 m position match the allowable value R, that is, the maximum transmission power P that satisfies the requirement of the weak radio station is calculated.
　送信電力Pが算出されると、以後、ステップ１００で選択した通信方式および周波数帯を用いる通信回線で、送信電力Pでの通信が開始される（ステップ１１０）。 After the transmission power P is calculated, communication with the transmission power P is started on the communication line using the communication method and frequency band selected in step 100 (step 110).
　以上説明した通り、本実施形態の無線通信システムでは、ソフトウェア無線機１０が、ソフトウェアを書き換えることにより、ユーザの要求に応える通信回線を適宜構成することができる。そして、ソフトウェア無線機１０は、その通信回線の周波数帯で微弱無線局の条件を満たす最大の送信電力Pを算出し、その送信電力Pで通信を開始する。このため、本実施形態のシステムによれば、ソフトウェア無線機１０を微弱無線局として効率的に稼働させつつ、ユーザが求める良好な品質の通信を適切に提供することができる。 As described above, in the wireless communication system of the present embodiment, the software defined radio 10 can appropriately configure a communication line that meets the user's request by rewriting the software. Then, the software defined radio 10 calculates the maximum transmission power P that satisfies the condition of the weak radio station in the frequency band of the communication line, and starts communication with the transmission power P. Therefore, according to the system of the present embodiment, it is possible to appropriately provide the communication of good quality required by the user while efficiently operating the software defined radio 10 as a weak radio station.
実施の形態２．
　次に、図５乃至図７を参照して本開示の実施の形態２について説明する。
　図５は、本実施形態の無線通信システムで用いられるソフトウェア無線機５０の構成を説明するための図である。尚、図５において、図２に示す要素と同一の要素については、共通する符号を付してその説明を省略または簡略する。 Embodiment 2.
Next, a second embodiment of the present disclosure will be described with reference to FIGS. 5 to 7.
FIG. 5 is a diagram for explaining the configuration of the software defined radio 50 used in the wireless communication system of the present embodiment. In FIG. 5, the same elements as those shown in FIG. 2 are designated by a common reference numeral, and the description thereof will be omitted or simplified.
　本実施形態のソフトウェア無線機５０は、アンテナモジュール５２を備えている。アンテナモジュール５２は、実施の形態１のアンテナ１２と同様に広帯域の周波数に対応していると共に、周波数に応じた利得Gを示す特性を有している。アンテナモジュール５２にはメモリが内蔵されている。このメモリには、アンテナモジュール５２の利得Gと周波数との関係がアンテナ利得情報５４として格納されている。 The software defined radio 50 of this embodiment includes an antenna module 52. The antenna module 52 corresponds to a wide band frequency like the antenna 12 of the first embodiment, and has a characteristic of showing a gain G according to the frequency. The antenna module 52 has a built-in memory. In this memory, the relationship between the gain G of the antenna module 52 and the frequency is stored as the antenna gain information 54.
　ソフトウェア無線機５０は、実施の形態１のソフトウェア無線機１０の場合と同様のハードウェア構成により実現されている。本実施形態では、ソフトウェア無線機５０が内蔵するメモリに、上記のアンテナ利得情報５４が転送される。以下、この転送によりソフトウェア無線機５０に格納される情報を、「アンテナ利得情報５６」とする。ソフトウェア無線機５０は、アンテナ利得情報５６を参照することで、通信に使用する周波数においてアンテナモジュール５２が示す利得Gを検知することができる。 The software defined radio 50 is realized by the same hardware configuration as in the case of the software defined radio 10 of the first embodiment. In the present embodiment, the antenna gain information 54 is transferred to the memory built in the software defined radio 50. Hereinafter, the information stored in the software defined radio 50 by this transfer is referred to as "antenna gain information 56". The software defined radio 50 can detect the gain G indicated by the antenna module 52 at the frequency used for communication by referring to the antenna gain information 56.
［実施の形態２の特徴］　
　図６は、図５に示すソフトウェア無線機５０の内部に構成される主要な要素を説明するためのブロック図である。図６に示す構成は、以下の三点を除いて図３に示す構成と同様である。
　１．アンテナ１２がアンテナモジュール５２に変更されている点、
　２．アンテナモジュール５２に格納されているアンテナ利得情報５４が、アンテナモジュール５２の近傍に示されている点、および
　３．アンテナ利得情報２８がアンテナ利得情報５６に置き換えられている点。
　尚、図６において図３に示す要素と同じ要素については、共通する符号を付して、その説明を省略または簡略する。 [Characteristics of Embodiment 2]
FIG. 6 is a block diagram for explaining the main elements configured inside the software defined radio 50 shown in FIG. The configuration shown in FIG. 6 is the same as the configuration shown in FIG. 3 except for the following three points.
1. 1. The point that the antenna 12 is changed to the antenna module 52,
2. 2. 2. The point where the antenna gain information 54 stored in the antenna module 52 is shown in the vicinity of the antenna module 52, and 3. The point that the antenna gain information 28 is replaced with the antenna gain information 56.
The same elements as those shown in FIG. 3 in FIG. 6 are designated by a common reference numeral, and the description thereof will be omitted or simplified.
　上記の通り、アンテナ利得情報５６は、アンテナモジュール５２に格納されたアンテナ利得情報５４が転送されてきたものである。本実施形態において、送信電力算出部３４は、電界強度の許容値Rを許容値情報３０から読み出し、３ｍ伝搬損失Lを３ｍ伝搬損失算出部３６から読み出すと共に、アンテナモジュール５２が示す利得Gをアンテナ利得情報５６から読み出す。そして、それらを上記（１）式に代入して、微弱無線局として許容される最大の送信電力P（＝R－G＋L）を算出する。 As described above, the antenna gain information 56 is the one to which the antenna gain information 54 stored in the antenna module 52 has been transferred. In the present embodiment, the transmission power calculation unit 34 reads the allowable value R of the electric field strength from the allowable value information 30, reads the 3m propagation loss L from the 3m propagation loss calculation unit 36, and reads the gain G indicated by the antenna module 52 from the antenna. Read from the gain information 56. Then, by substituting them into the above equation (1), the maximum transmission power P (= RG + L) allowed as a weak radio station is calculated.
　図７は、上記の機能を実現させるためにソフトウェア無線機５０の制御部２０が実行する処理のフローチャートである。図７に示すフローチャートは、ステップ１０２がステップ１１２に置き換えられている点を除いて、図４に示すフローチャートと同様である。以下、図７に示すステップのうち、図４に示すステップと同様のステップについては、共通する符号を付してその説明を省略または簡略する。 FIG. 7 is a flowchart of processing executed by the control unit 20 of the software defined radio 50 in order to realize the above functions. The flowchart shown in FIG. 7 is similar to the flowchart shown in FIG. 4, except that step 102 is replaced by step 112. Hereinafter, among the steps shown in FIG. 7, the same steps as those shown in FIG. 4 are designated by a common reference numeral, and the description thereof will be omitted or simplified.
　図７に示すルーチンでは、ステップ１００の処理に続いて、選択された周波数におけるアンテナモジュール５２の利得Gが、アンテナ利得情報５６から読み出される（ステップ１１２）。 In the routine shown in FIG. 7, following the process of step 100, the gain G of the antenna module 52 at the selected frequency is read from the antenna gain information 56 (step 112).
　以後、ステップ１０４および１０６で、使用する周波数における３ｍ伝搬損失Lおよび許容値Rが夫々読み出され、ステップ１０８で、送信電力P（＝R－G＋L）が算出される。 After that, in steps 104 and 106, the 3 m propagation loss L and the allowable value R at the frequency to be used are read out, respectively, and in step 108, the transmission power P (= RG + L) is calculated.
　以上説明した通り、本実施形態のソフトウェア無線機５０は、実施の形態１のソフトウェア無線機１０と同様に、微弱無線局に許容される最大の送信電力Pを算出することができる。このため、本実施形態の無線通信システムによれば、実施の形態１の場合と同様に、ソフトウェア無線機５０を微弱無線局として効率的に稼働させつつ、ユーザが求める良好な品質の通信を適切に提供することができる。 As described above, the software defined radio 50 of the present embodiment can calculate the maximum transmission power P allowed for the weak radio station, similarly to the software defined radio 10 of the first embodiment. Therefore, according to the wireless communication system of the present embodiment, as in the case of the first embodiment, the software defined radio 50 is efficiently operated as a weak wireless station, and the communication of good quality required by the user is appropriate. Can be provided to.
［実施の形態１または２の変形］
　ところで、上述した実施の形態１および２では、日本国における微弱無線局の規定を前提に、無線装置から３ｍ離れた位置での電界強度を許容値R以下に抑えることとしている。しかしながら、微弱無線局の規定が異なる場合は、その３ｍを、その規定に応じた他の距離として実施の形態１の場合と同様の処理を行うこととしてもよい。 [Modification of Embodiment 1 or 2]
By the way, in the above-described first and second embodiments, the electric field strength at a position 3 m away from the radio device is suppressed to the allowable value R or less on the premise of the regulation of the weak radio station in Japan. However, if the provisions of the weak radio station are different, the same processing as in the case of the first embodiment may be performed with the 3m as another distance according to the provisions.
　また、上述した実施の形態１および２では、送信電力Pの算出を適用する対象を微弱無線局に限定しているが、本開示はこれに限定されるものではない。本開示に係る技術は、微弱無線局に限らず、無線局に対して電界強度に許容値が設けられている場合に、広く適用することが可能である。 Further, in the above-described first and second embodiments, the target to which the calculation of the transmission power P is applied is limited to the weak radio station, but the present disclosure is not limited to this. The technique according to the present disclosure can be widely applied not only to a weak radio station but also to a radio station where an allowable electric field strength is provided.
　また、上述した実施の形態１および２では、ユーザには、通信方式と周波数帯の組み合わせを入力する選択肢と、伝送容量および伝送品質を入力する選択肢とが与えられているが、ユーザに提供できる選択肢はこれらに限定されるものではない。例えば、通信方式と周波数帯の一方だけの入力を求めて、他方は、基準の伝送容量および伝送品質が満たされるように決定することとしてもよい。また、伝送容量と伝送品質の一方だけの入力を求めて、他方については基準値を当てはめて通信方式および周波数帯を探索することとしてもよい。 Further, in the above-described first and second embodiments, the user is given an option of inputting a combination of a communication method and a frequency band and an option of inputting a transmission capacity and a transmission quality, but the user can be provided with the option. The options are not limited to these. For example, the input of only one of the communication method and the frequency band may be obtained, and the other may be determined so that the reference transmission capacity and transmission quality are satisfied. Further, the communication method and the frequency band may be searched by obtaining the input of only one of the transmission capacity and the transmission quality and applying the reference value to the other.
　また、上述した実施の形態１および２では、ソフトウェア無線機１０、５０が、送信電力Pの算出後に通信を開始することとしている。この機能は、ソフトウェア無線機１０、５０を微弱無線局として用いる場合には、送信電力Pが定まるまでは通信の開始を禁止する機能に変更してもよい。 Further, in the above-described first and second embodiments, the software defined radios 10 and 50 start communication after calculating the transmission power P. When the software defined radios 10 and 50 are used as weak radio stations, this function may be changed to a function that prohibits the start of communication until the transmission power P is determined.
　また、上述した実施の形態１および２では、ソフトウェア無線機１０、５０が、ステップ１０８で算出した送信電力Pで通信を開始することとしているが、本開示はこれに限定されるものではない。例えば、送信電力Pを通信に用いる送信電力の上限値と位置付けて、ソフトウェア無線機１０、５０は、所望の伝送品質が得られる限りにおいて、より小さな送信電力を用いることとしてもよい。 Further, in the above-described first and second embodiments, the software defined radios 10 and 50 start communication with the transmission power P calculated in step 108, but the present disclosure is not limited to this. For example, the software defined radios 10 and 50 may use a smaller transmission power as long as the desired transmission quality can be obtained by positioning the transmission power P as the upper limit value of the transmission power used for communication.
　また、上述した実施の形態２では、アンテナモジュール５２のメモリに格納されているアンテナ利得情報５４を、ソフトウェア無線機５０のメモリに転送し、ソフトウェア無線機５０に格納されたアンテナ利得情報５６を送信電力Pの算出に用いることとしている。しかしながら、本開示はこれに限定されるものではなく、アンテナモジュール５２に格納されているアンテナ利得情報５４を、直接送信電力Pの算出に用いることとしてもよい。 Further, in the second embodiment described above, the antenna gain information 54 stored in the memory of the antenna module 52 is transferred to the memory of the software defined radio 50, and the antenna gain information 56 stored in the software defined radio 50 is transmitted. It is used to calculate the power P. However, the present disclosure is not limited to this, and the antenna gain information 54 stored in the antenna module 52 may be used for the calculation of the direct transmission power P.
１０、５０　ソフトウェア無線機
１２　アンテナ
２８、５４、５６　アンテナ利得情報
３０　許容値情報
３４　送信電力算出部
３６　３ｍ伝搬損失算出部
５２　アンテナモジュール
L　距離３ｍの位置での伝搬損失
R　電界強度の許容値
P　送信電力
G　利得 10, 50 Software defined radio 12 Antenna 28, 54, 56 Antenna gain information 30 Allowable value information 34 Transmission power calculation unit 36 3m Propagation loss calculation unit 52 Antenna module
Propagation loss at a position with an L distance of 3 m
R Allowable field strength
P transmission power
G gain

Claims (8)

  1. 　ソフトウェアの変更により再構成が可能な無線通信用のハードウェアリソースと、前記ハードウェアリソースを無線通信に対応させるためのソフトウェアを格納したメモリと、前記メモリに格納されているソフトウェアを用いて前記ハードウェアリソースを再構成する制御部と、無線信号を授受するアンテナとを備えるソフトウェア無線機を活用した無線通信システムであって、
    　前記ソフトウェア無線機は、
    　前記アンテナの利得と周波数との関係であるアンテナ利得情報を記憶した第１のメモリ領域と、
    　無線局について規定された電界強度の許容値と周波数との関係である許容値情報を記憶した第２のメモリ領域とを備え、
    　前記制御部は、
    　通信に用いる通信方式および周波数帯を選択する選択処理と、
    　前記通信方式および前記周波数帯を用いる通信回線を構成する処理と、
    　無線局が満たすべき許容値Rと比較する電界強度を測定すべき位置として規定されている距離だけ前記アンテナから離れた位置で、前記周波数帯において生ずる規定距離伝搬損失Lを算出する処理と、
    　前記第１のメモリ領域から、前記アンテナが前記周波数帯で示す利得Gを読み出す利得読み出し処理と、
    　前記第２のメモリ領域から、前記周波数帯における許容値Rを読み出す処理と、
    　P ＝ R － G ＋ L　に従って送信電力Pの上限値を算出する処理と、
    　を実行する無線通信システム。     The hardware resource for wireless communication that can be reconfigured by changing the software, the memory that stores the software for making the hardware resource compatible with wireless communication, and the hardware that uses the software stored in the memory. It is a wireless communication system that utilizes a software defined radio equipped with a control unit that reconfigures hardware resources and an antenna that sends and receives wireless signals.
    The software defined radio
    A first memory area that stores antenna gain information, which is the relationship between the antenna gain and frequency, and
    It has a second memory area that stores the permissible value information, which is the relationship between the permissible value of the electric field strength specified for the radio station and the frequency.
    The control unit
    Selection processing to select the communication method and frequency band used for communication,
    Processing that constitutes a communication line using the communication method and the frequency band, and
    Processing to calculate the specified distance propagation loss L generated in the frequency band at a position separated from the antenna by the distance specified as the position where the electric field strength to be compared with the allowable value R to be satisfied by the radio station should be measured.
    Gain read processing for reading the gain G indicated by the antenna in the frequency band from the first memory area, and
    The process of reading the allowable value R in the frequency band from the second memory area,
    The process of calculating the upper limit of the transmission power P according to P = R-G + L, and
    A wireless communication system that runs.
  2. 　前記第１のメモリ領域は、前記ソフトウェア無線機に内蔵されるメモリに設けられており、
    　当該第１のメモリ領域には、使用が想定されている複数のアンテナ夫々についての利得と周波数との関係を含むアンテナ利得情報が格納されており、
    　前記利得読み出し処理は、前記ソフトウェア無線機に装着されたアンテナが前記周波数帯で示す利得Gを前記第1のメモリ領域から読み出す処理を含む請求項１に記載の無線通信システム。     The first memory area is provided in the memory built in the software defined radio.
    The first memory area stores antenna gain information including the relationship between the gain and the frequency of each of the plurality of antennas expected to be used.
    The wireless communication system according to claim 1, wherein the gain reading process includes a process in which an antenna mounted on the software defined radio reads a gain G indicated by the frequency band from the first memory area.
  3. 　前記アンテナは、アンテナモジュールの一部として設けられており、
    　当該アンテナモジュールは、前記第１のメモリ領域を含むメモリを備えている請求項１に記載の無線通信システム。     The antenna is provided as a part of the antenna module.
    The wireless communication system according to claim 1, wherein the antenna module includes a memory including the first memory area.
  4. 　前記ソフトウェア無線機は、ユーザによる入力を受け付ける入力インターフェースを備え、
    　前記選択処理は、
    　前記入力インターフェースを介して、通信方式および周波数帯の指定を受け付ける処理と、
    　指定された通信方式および周波数帯を、通信に用いるものとして選択する処理と、
    　を含む請求項１乃至３の何れか１項に記載の無線通信システム。     The software defined radio has an input interface that accepts input by the user.
    The selection process is
    The process of accepting the designation of the communication method and frequency band via the input interface,
    The process of selecting the specified communication method and frequency band as the one to be used for communication, and
    The wireless communication system according to any one of claims 1 to 3.
  5. 　前記ソフトウェア無線機は、ユーザによる入力を受け付ける入力インターフェースを備え、
    　前記選択処理は、
    　前記入力インターフェースを介して、伝送容量および伝送品質の指定を受け付ける処理と、
    　指定された伝送容量および伝送品質を満たす通信方式および周波数帯を探索する処理と、
    　前記探索の結果得られた通信方式および周波数帯を、通信に用いるものとして選択する処理と、
    　を含む請求項１乃至４の何れか１項に記載の無線通信システム。     The software defined radio has an input interface that accepts input by the user.
    The selection process is
    The process of accepting the designation of transmission capacity and transmission quality via the input interface,
    The process of searching for a communication method and frequency band that meets the specified transmission capacity and transmission quality,
    The process of selecting the communication method and frequency band obtained as a result of the search as those used for communication, and
    The wireless communication system according to any one of claims 1 to 4.
  6. 　ソフトウェアの変更により再構成が可能な無線通信用のハードウェアリソースと、前記ハードウェアリソースを無線通信に対応させるためのソフトウェアを格納したメモリと、前記メモリに格納されているソフトウェアを用いて前記ハードウェアリソースを再構成する制御部と、無線信号を授受するアンテナとを備えるソフトウェア無線機を活用した電界強度制御方法であって、
    　前記アンテナの利得と周波数との関係であるアンテナ利得情報を第１のメモリ領域に格納するステップと、
    　無線局について規定された電界強度の許容値と周波数との関係である許容値情報を第２のメモリ領域に格納するステップと、
    　通信に用いる通信方式および周波数帯を選択するステップと、
    　前記通信方式および前記周波数帯を用いる通信回線を構成するステップと、
    　無線局が満たすべき許容値Rと比較する電界強度を測定すべき位置として規定されている距離だけ前記アンテナから離れた位置で、前記周波数帯において生ずる規定距離伝搬損失Lを算出するステップと、
    　前記第１のメモリ領域から、前記アンテナが前記周波数帯で示す利得Gを読み出すステップと、
    　前記第２のメモリ領域から、前記周波数帯における許容値Rを読み出すステップと、
    　P ＝ R － G ＋ L　に従って送信電力Pの上限値を算出するステップと、
    　を含む電界強度制御方法。     The hardware resource for wireless communication that can be reconfigured by changing the software, the memory that stores the software for making the hardware resource compatible with wireless communication, and the hardware that uses the software stored in the memory. It is an electric field strength control method that utilizes a software defined radio equipped with a control unit that reconfigures hardware resources and an antenna that sends and receives radio signals.
    The step of storing the antenna gain information, which is the relationship between the antenna gain and the frequency, in the first memory area, and
    A step of storing the permissible value information, which is the relationship between the permissible value of the electric field strength and the frequency specified for the radio station, in the second memory area, and
    Steps to select the communication method and frequency band used for communication,
    Steps to configure a communication line using the communication method and the frequency band, and
    A step of calculating the specified distance propagation loss L generated in the frequency band at a position separated from the antenna by a distance specified as a position for measuring the electric field strength to be compared with the allowable value R to be satisfied by the radio station.
    A step of reading the gain G indicated by the antenna in the frequency band from the first memory area.
    A step of reading the allowable value R in the frequency band from the second memory area,
    The step of calculating the upper limit of the transmission power P according to P = R-G + L, and
    Electric field strength control method including.
  7. 　ソフトウェアの変更により再構成が可能な無線通信用のハードウェアリソースと、前記ハードウェアリソースを無線通信に対応させるためのソフトウェアを格納したメモリと、前記メモリに格納されているソフトウェアを用いて前記ハードウェアリソースを再構成する制御部と、無線信号を授受するアンテナとを備えるソフトウェア無線機であって、
    　前記アンテナの利得と周波数との関係であるアンテナ利得情報を記憶した第１のメモリ領域と、
    　無線局について規定された電界強度の許容値と周波数との関係である許容値情報を記憶した第２のメモリ領域とを備え、
    　前記制御部は、
    　通信に用いる通信方式および周波数帯を選択する選択処理と、
    　前記通信方式および前記周波数帯を用いる通信回線を構成する処理と、
    　無線局が満たすべき許容値Rと比較する電界強度を測定すべき位置として規定されている距離だけ前記アンテナから離れた位置で、前記周波数帯において生ずる規定距離伝搬損失Lを算出する処理と、
    　前記第１のメモリ領域から、前記アンテナが前記周波数帯で示す利得Gを読み出す利得読み出し処理と、
    　前記第２のメモリ領域から、前記周波数帯における許容値Rを読み出す処理と、
    　P ＝ R － G ＋ L　に従って送信電力Pの上限値を算出する処理と、
    　を実行するソフトウェア無線機。     The hardware resource for wireless communication that can be reconfigured by changing the software, the memory that stores the software for making the hardware resource compatible with wireless communication, and the hardware that uses the software stored in the memory. A software defined radio equipped with a control unit that reconfigures hardware resources and an antenna that sends and receives radio signals.
    A first memory area that stores antenna gain information, which is the relationship between the antenna gain and frequency, and
    It has a second memory area that stores the permissible value information, which is the relationship between the permissible value of the electric field strength specified for the radio station and the frequency.
    The control unit
    Selection processing to select the communication method and frequency band used for communication,
    Processing that constitutes a communication line using the communication method and the frequency band, and
    Processing to calculate the specified distance propagation loss L generated in the frequency band at a position separated from the antenna by the distance specified as the position where the electric field strength to be compared with the allowable value R to be satisfied by the radio station should be measured.
    Gain read processing for reading the gain G indicated by the antenna in the frequency band from the first memory area, and
    The process of reading the allowable value R in the frequency band from the second memory area,
    The process of calculating the upper limit of the transmission power P according to P = R-G + L, and
    Software defined radio to run.
  8. 　コンピュータに、請求項７に記載のソフトウェア無線機の機能を実現させるためのプログラムを含む電界強度制御用プログラム。
    　     A program for controlling electric field strength, which comprises a program for realizing the function of the software defined radio according to claim 7 in a computer.
PCT/JP2020/036727 2020-09-28 2020-09-28 Wireless communication system, electric field intensity control method, software wireless device, and electric field intensity control program WO2022064718A1 (en)

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