WO2022064717A1 - Wireless communication system, transmission power control method, software defined radio, and transmission power control program - Google Patents

Wireless communication system, transmission power control method, software defined radio, and transmission power control program Download PDF

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Publication number
WO2022064717A1
WO2022064717A1 PCT/JP2020/036725 JP2020036725W WO2022064717A1 WO 2022064717 A1 WO2022064717 A1 WO 2022064717A1 JP 2020036725 W JP2020036725 W JP 2020036725W WO 2022064717 A1 WO2022064717 A1 WO 2022064717A1
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Prior art keywords
frequency band
software defined
radio
communication
software
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PCT/JP2020/036725
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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 JP2022551116A priority Critical patent/JP7396510B2/en
Priority to PCT/JP2020/036725 priority patent/WO2022064717A1/en
Publication of WO2022064717A1 publication Critical patent/WO2022064717A1/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 a radio communication system, a transmission power control method, a software defined radio, and a program for transmission power control, and is particularly suitable for controlling the electric field strength so as to satisfy the provisions of a weak radio station. , Transmission power control method, software defined radio, and transmission power control program.
  • 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 software defined radio communication system utilizing a software defined radio equipped with a control unit for reconstructing the hardware resource using software stored in the memory and an antenna for exchanging and receiving radio signals, and using the same antenna.
  • the control unit performs selection processing for selecting a communication method and frequency band to be used for communication, and the communication method and The process of sharing the frequency band with the other software defined radio, the process of forming a communication line using the communication method and the frequency band, and the reception level of the signal transmitted from the other software defined radio in the frequency band.
  • the frequency band at a position separated from the antenna by the distance specified as the position where the process of calculating the propagation loss Ld generated in the frequency band and the electric field strength to be compared with the allowable value R to be satisfied by the radio station should be measured.
  • the process of calculating the specified distance propagation loss L that occurs in the above, the process of reading the allowable value R in the frequency band from the memory, and the transmission power P according to P R- (Rt + Ld-Pt) / 2 + L. It is desirable to execute the process of calculating the upper limit value.
  • 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 a transmission power control method utilizing a software radio equipped with a control unit for reconstructing the hardware resource using the software and an antenna for exchanging and receiving radio signals, and is provided with the same antenna and between the antennas. A step of arranging two software radios separated so as to generate a distance d, a step of allowing one software radio to select a communication method and a frequency band to be used for communication, and the communication method and the frequency band.
  • the step of causing the one software radio to detect the distance d the step of causing the one software radio to detect the distance d from the antenna in the frequency band.
  • a step of calculating the specified distance propagation loss L generated in the frequency band, a step of causing the one software radio to read the allowable value R in the frequency band from the memory, and the one software radio. It is desirable to include a step of calculating the upper limit of the transmission power P according to P R- (Rt + Ld-Pt) / 2 + L.
  • 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 radio device including a control unit that reconfigures the hardware resource using the software and an antenna that exchanges radio signals, and the control unit selects a communication method and a frequency band to be used for communication. Selection processing, processing for sharing the communication method and the frequency band with other radios, processing for forming a communication line using the communication method and the frequency band, and transmission from the other radios in the frequency band.
  • a process of calculating the specified distance propagation loss L generated in the frequency band at a position separated from the antenna by a certain distance, a process of reading the allowable value R in the frequency band from the memory, and P R-( It is desirable to execute the process of calculating the upper limit of the transmission power P according to Rt + Ld-Pt) / 2 + L.
  • 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 defined for 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 imposed on the radio station.
  • FIG. 1 shows the structure of the wireless communication system of Embodiment 1 of this disclosure. It is a block diagram for demonstrating the element configured inside the software defined radio included in the wireless communication system shown in FIG. 1. It is a flowchart for demonstrating the content of the process executed by the software defined radio shown in FIG.
  • FIG. 1 shows an example of a wireless communication system according to the first embodiment of the present disclosure.
  • the wireless communication system shown in FIG. 1 includes two software defined radios 10-1 and 10-2. These two software defined radios 10-1 and 10-2 have the same configuration. Hereinafter, when it is not necessary to distinguish between them, the description will proceed using the name of "software defined radio 10".
  • Software defined radio 10-1 is connected to antenna 12-1.
  • the software defined radio 10-2 is connected to the antenna 12-2.
  • the two antennas 12-1 and 12-2 have the same configuration and have the same antenna gain G.
  • the software defined radios 10-1 and 10-2 can communicate wirelessly via the antennas 12-1 and 12-2.
  • antennas 12-1 and 12-2. Hereinafter, when it is not necessary to distinguish between the two antennas, they will be referred to as "antenna 12" and the description will proceed.
  • the software defined radio 10 is equipped with hardware that can be reconfigured by software, and the frequency band and communication method used for wireless communication can be changed as needed.
  • the software defined radio 10 can be used, for example, as a base station for mobile communication.
  • 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 a high frequency signal between the antenna 12 and the FPGA 14.
  • 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 communication state required for the software defined radio 10, and reconfigures the hardware corresponding to the state.
  • 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 three communication methods A to C (WiFi (registered trademark) method, LTE method, etc.).
  • 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. 1 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 transmits the signals received by the antenna 12 to the communication lines 22, 24, 26. It can be converted into data or audio signals via.
  • the software defined radio 10 transmits packets 28-1 and 28-2 to the software defined radio 10 of the communication partner before starting the communication of data and voice signals.
  • packets 28 When it is not necessary to distinguish between the two packets 28-1 and 28-2, they will be referred to as "packets 28" and the description will proceed.
  • the packet 28 is transmitted with the default transmission output Pt. Further, the information of the transmission output Pt is embedded in the packet 28.
  • the software defined radio 10 has a built-in memory 30.
  • the software defined radio 10 is used as a weak radio station that does not require notification as a radio station.
  • the permissible value set by the Ministry of Internal Affairs and Communications
  • the memory 30 stores information about the permissible value, which is defined with the frequency as a parameter.
  • 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 user Before starting communication, the user is requested to input the distance d between the antennas 12-1 and 12-2. 5. The user can enter the distance d via the input interface.
  • the propagation loss Ld at the position of the distance d from the antenna 12 is calculated according to the known free space propagation loss equation for each frequency band used. 6. By the same calculation method, the propagation loss L at a position 3 m away from the antenna 12 is calculated for each frequency band used.
  • the packet 28 is transmitted to the software defined radio 10 of the communication partner with the default transmission output Pt.
  • the packet 28 includes information on the transmission output Pt.
  • the reception level Rt is measured and the transmission output Pt is extracted from the received packet 28.
  • the memory 30 holds information on the permissible value R of the electric field strength at a position at a distance of 3 m, which is defined for a weak radio station.
  • the gain G of the antenna 12 is calculated based on the following relational expression.
  • the formula used in the description of the present disclosure is a calculation formula in dB notation.
  • Rt Pt + 2 ⁇ G - Ld ⁇ ⁇ ⁇ (1)
  • Rt is the reception level as described above.
  • Pt is the transmission output
  • 2 ⁇ G is the gain of the antenna 12 on the transmitting side and the receiving side.
  • Ld is the propagation loss at the distance d, that is, the propagation loss at the receiving position.
  • the following equation can be obtained by rearranging the above equation (1) with respect to the gain G.
  • G (Rt + Ld- Pt) / 2 ⁇ ⁇ ⁇ (2)
  • the software defined radio 10 calculates the gain G of the antenna 12 according to the above equation (2).
  • the transmission power P for satisfying the condition of the weak radio station is calculated.
  • P R- (Rt + Ld-Pt) / 2 + 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.
  • the above equation (3) can be obtained. Therefore, according to the above equation (3), the maximum transmission power P satisfying the condition of the weak radio station can be calculated.
  • FIG. 2 is a block diagram for explaining elements configured inside the software defined radio 10 shown in FIG. 1 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 transmits the data or the like via the antenna 12-1.
  • the software defined radio 10 also includes a radio wave receiving unit 34.
  • the radio wave receiving unit 34 demodulates the radio signal received by the antenna 12-1 into a received signal and provides it to an external device.
  • the software defined radio 10 includes a packet generation unit 36. Prior to the start of communication, the packet generation unit 36 instructs the radio wave transmission unit 32 to transmit the packet 28 in which the predetermined transmission output Pt is described by the transmission output Pt.
  • the software defined radio 10 includes a 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 sets the communication line corresponding to the input communication method and frequency band.
  • 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 sets a communication line using the communication method and frequency band obtained as a result of the search. .. As a result, a communication line that meets the user's request for communication is set.
  • the memory 30 stores information regarding the permissible value of the electric field strength to be satisfied by the weak radio station.
  • the provisions of a weak radio station set by the Ministry of Internal Affairs and Communications of Japan are stored. Specifically, information on the permissible value R of the electric field strength at a distance of 3 m from the radio equipment is held for each frequency.
  • the information of the allowable value R stored in the memory 30 is provided to the transmission power calculation unit 42.
  • the transmission power calculation unit 42 calculates the required transmission power P according to the above equation (3) based on the permissible value R, the gain G of the antenna 12, and the propagation loss L at a distance of 3 m.
  • the propagation loss L at a distance of 3 m is calculated by the 3 m propagation loss calculation unit 44. Specifically, the 3m propagation loss calculation unit 44 calculates the propagation loss L generated at a position 3 m away from the antenna 12 in the frequency band selected by the line information selection unit 38 according to the formula of the free space propagation loss.
  • the software defined radio 10 includes a reception level measuring unit 46.
  • the reception level measuring unit 46 measures the reception level Rt of the packet 28 and inputs the information of the transmission output Pt included in the packet 28. Extract.
  • the information of the reception level Rt and the transmission output Pt acquired by the reception level measurement unit 46 is provided to the antenna gain calculation unit 48.
  • the antenna gain calculation unit 48 calculates the antenna gain G by the above equation (2) based on those Rt and Pt and the propagation loss Ld at the distance d.
  • the calculated antenna gain G information is provided to the transmission power calculation unit 42 described above.
  • the propagation loss Ld at the distance d is calculated by the propagation loss calculation unit 50.
  • the propagation loss calculation unit 50 is provided with a user input regarding a distance d between wireless devices.
  • the propagation loss calculation unit 50 calculates the propagation loss Ld generated at a position separated from the antenna 12 by a distance d in the frequency band selected by the line information selection unit 38 according to the free space propagation loss equation.
  • FIG. 3 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. It is assumed that this process is performed before the software defined radios 10 having the same antenna 12 are arranged at positions separated by a predetermined distance d and they start communication.
  • 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 selected communication method and frequency band are shared with the software defined radio 10-2 of the communication partner by a predetermined method.
  • the user input 52 regarding the distance d between the antennas is accepted (step 102).
  • the user measures the distance d between the antennas prior to this process, and here, the result of the measurement is input.
  • the propagation loss Ld generated at the position of the distance d from the antenna 12 is calculated (step 104).
  • the packet 28 is transmitted to the software defined radio 10 of the transmission partner at the predetermined transmission output Pt (step 106).
  • the packet 28 contains the information of the transmission output Pt as described above.
  • the reception processing of the packet 28 is performed (step 108). Specifically, the information of the transmission output Pt included in the packet 28 is extracted, and the reception level Rt of the packet 28 is measured.
  • the antenna gain G is calculated (step 110). Specifically, the gain G is calculated by substituting the reception level Rt measured in step 108, the propagation loss Ld calculated in step 104, and the transmission output Pt extracted in step 108 into the above equation (2).
  • the propagation loss L at a position 3 m away from the antenna 12 is calculated (step 112).
  • the permissible value R of the electric field strength permissible for the weak radio station is read out (step 114). More specifically, at the frequency selected in step 100, the permissible value R at the 3 m position recognized as a weak radio station is read from the memory 30.
  • the maximum transmission power P that keeps the electric field strength at the 3 m position within the allowable value R is calculated (step 116). Specifically, by substituting the antenna gain G calculated in step 110, the 3 m propagation loss L calculated in step 112, and the permissible value R read in step 114 into the above equations (2) and (3). The transmission power P is calculated.
  • step 118 After the transmission power P is calculated, communication with the transmission power P is started using the communication method and frequency band selected in step 100 (step 118).
  • 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.
  • 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 transmission power P is calculated for each of the two software defined radios 10 arranged in opposition to each other, and the packet 28 is transmitted to both radios.
  • the present disclosure is not limited to this.
  • the process of step 106 may be omitted from the process executed by the software defined radio 10-1 in the flowchart shown in FIG.
  • the information of the default transmission output Pt is included in the packet 28 and notified to the software defined radio 10 of the communication partner.
  • the present disclosure is not limited to this. If the transmission output Pt used for calculating the transmission power P is determined in advance, the process of including the information in the packet 28 may be omitted.
  • 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 options that can be provided to the user are It is 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 radio 10 starts communication after calculating the transmission power P. More specifically, when the software defined radio 10 is used as a weak radio station, this function may be interpreted as prohibiting the start of communication until the transmission power P is determined.
  • the user measures and inputs the distance d between the two antennas 12, but the present disclosure is not limited to this.
  • the distance d may be measured on the side of the wireless communication system by another known method.
  • the software defined radio 10 starts communication with the transmission power P calculated in step 116, but the present disclosure is not limited to this.
  • the software defined radio 10 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.

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Abstract

Two software defined radios with the same antenna are placed apart by a distance d. A communication method and frequency band to be used are selected (step 100). The distance d is detected (step 102). At a position at a distance d from the antenna, a propagation loss Ld generated in the frequency band is calculated (step 104). A reception level Rt of a signal transmitted in the frequency band from the other software defined radio is detected, and a transmission output Pt used for the transmission is detected (step 108). A 3m-propagation loss L generated in the frequency band is calculated at a position separated from the antenna by 3m, which is defined as a position where an electric field strength to be compared with an allowable value R to be satisfied by a weak radio station is to be measured (step 112). The allowable value R in the frequency band is read out (step 114). The upper limit of the transmission power P is calculated in accordance with P = R - (Rt + Ld - Pt)/2 + L (step 118).

Description

無線通信システム、送信電力制御方法、ソフトウェア無線機、および送信電力制御用プログラムWireless communication system, transmission power control method, software defined radio, and transmission power control program
　この開示は、無線通信システム、送信電力制御方法、ソフトウェア無線機、および送信電力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、送信電力制御方法、ソフトウェア無線機、および送信電力制御用プログラムに関する。 This disclosure relates to a radio communication system, a transmission power control method, a software defined radio, and a program for transmission power control, and is particularly suitable for controlling the electric field strength so as to satisfy the provisions of a weak radio station. , Transmission power control method, software defined radio, and transmission power control program.
　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、同一のアンテナを備え、アンテナ間に距離dが生ずるように離間して配置される二台のソフトウェア無線機を備え、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他方のソフトウェア無線機と共有する処理と、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、他方のソフトウェア無線機から前記周波数帯で送信されてきた信号の受信レベルRtを検知する処理と、前記他方のソフトウェア無線機が前記信号の送信に用いた送信出力Ptを検知する出力検知処理と、前記距離dを検知する処理と、前記アンテナから距離dの位置で、前記周波数帯において生ずる伝搬損失Ldを算出する処理と、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、前記メモリから、前記周波数帯における前記許容値Rを読み出す処理と、P ＝ R － (Rt ＋ Ld－ Pt）/ 2 ＋ 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 software defined radio communication system utilizing a software defined radio equipped with a control unit for reconstructing the hardware resource using software stored in the memory and an antenna for exchanging and receiving radio signals, and using the same antenna. It is equipped with two software defined radios that are spaced apart so that a distance d is generated between the antennas, and the control unit performs selection processing for selecting a communication method and frequency band to be used for communication, and the communication method and The process of sharing the frequency band with the other software defined radio, the process of forming a communication line using the communication method and the frequency band, and the reception level of the signal transmitted from the other software defined radio in the frequency band. A process for detecting Rt, an output detection process for detecting the transmission output Pt used by the other software defined radio to transmit the signal, a process for detecting the distance d, and a position at a distance d from the antenna. The frequency band at a position separated from the antenna by the distance specified as the position where the process of calculating the propagation loss Ld generated in the frequency band and the electric field strength to be compared with the allowable value R to be satisfied by the radio station should be measured. The process of calculating the specified distance propagation loss L that occurs in the above, the process of reading the allowable value R in the frequency band from the memory, and the transmission power P according to P = R- (Rt + Ld-Pt) / 2 + L. It is desirable to execute the process of calculating the upper limit value.
　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送信電力制御方法であって、同一のアンテナを備え、アンテナ間に距離dが生ずるように離間して二台のソフトウェア無線機を配置するステップと、一方のソフトウェア無線機に、通信に用いる通信方式および周波数帯を選択させるステップと、前記通信方式および前記周波数帯を前記二台のソフトウェア無線機で共有させるステップと、前記二台のソフトウェア無線機に、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させるステップと、他方のソフトウェア無線機に、前記周波数帯で信号を送信させるステップと、前記一方のソフトウェア無線機に、送信されてきた前記信号の受信レベルRtを検知させるステップと、前記一方のソフトウェア無線機に、前記他方のソフトウェア無線機が前記信号の送信に用いた送信出力Ptを検知させるステップと、前記一方のソフトウェア無線機に、前記距離dを検知させるステップと、前記一方のソフトウェア無線機に、前記アンテナから距離dの位置で、前記周波数帯において生ずる伝搬損失Ldを算出させるステップと、前記一方のソフトウェア無線機に、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を算出させるステップと、前記一方のソフトウェア無線機に、前記メモリから、前記周波数帯における前記許容値Rを読み出させるステップと、前記一方のソフトウェア無線機に、P ＝ R － (Rt ＋ Ld－ Pt）/ 2 ＋ L　に従って送信電力Pの上限値を算出させるステップと、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 a transmission power control method utilizing a software radio equipped with a control unit for reconstructing the hardware resource using the software and an antenna for exchanging and receiving radio signals, and is provided with the same antenna and between the antennas. A step of arranging two software radios separated so as to generate a distance d, a step of allowing one software radio to select a communication method and a frequency band to be used for communication, and the communication method and the frequency band. A step of sharing between the two software radios, a step of causing the two software radios to configure a communication line using the communication method and the frequency band, and a step of causing the other software radio to configure the communication line in the frequency band. A step of transmitting a signal, a step of causing one of the software radios to detect the reception level Rt of the transmitted signal, and a step of causing the one software radio to transmit the signal by the other software radio. In the step of detecting the transmission output Pt used in the above, the step of causing the one software radio to detect the distance d, and the step of causing the one software radio to detect the distance d from the antenna in the frequency band. At a position away from the antenna by a distance specified as a step for calculating the propagation loss Ld to be generated and a position for measuring the electric field strength to be compared with the allowable value R to be satisfied by the one of the software radios. , A step of calculating the specified distance propagation loss L generated in the frequency band, a step of causing the one software radio to read the allowable value R in the frequency band from the memory, and the one software radio. It is desirable to include a step of calculating the upper limit of the transmission power P according to P = R- (Rt + Ld-Pt) / 2 + 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他の無線機と共有する処理と、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、前記他の無線機から前記周波数帯で送信されてきた信号の受信レベルRtを検知する処理と、前記他の無線機が前記信号の送信に用いた送信出力Ptを検知する出力検知処理と、前記他の無線機とのアンテナ間の距離dを検知する処理と、前記アンテナから距離dの位置で、前記周波数帯において生ずる伝搬損失Ldを算出する処理と、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、前記メモリから、前記周波数帯における前記許容値Rを読み出す処理と、P ＝ R － (Rt ＋ Ld－ Pt）/ 2 ＋ 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 radio device including a control unit that reconfigures the hardware resource using the software and an antenna that exchanges radio signals, and the control unit selects a communication method and a frequency band to be used for communication. Selection processing, processing for sharing the communication method and the frequency band with other radios, processing for forming a communication line using the communication method and the frequency band, and transmission from the other radios in the frequency band. The process of detecting the reception level Rt of the received signal, the output detection process of detecting the transmission output Pt used by the other radio for transmitting the signal, and the distance d between the antennas of the other radio. Is specified as a process for detecting, a process for calculating the propagation loss Ld generated in the frequency band at a position d from the antenna, and a position for measuring the electric field strength to be compared with the allowable value R to be satisfied by the radio station. A process of calculating the specified distance propagation loss L generated in the frequency band at a position separated from the antenna by a certain distance, a process of reading the allowable value R in the frequency band from the memory, and P = R-( It is desirable to execute the process of calculating the upper limit of the transmission power P according to Rt + Ld-Pt) / 2 + 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ついて定められている許容値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、無線局に課された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 defined for 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 imposed on the radio station.
本開示の実施の形態１の無線通信システムの構成を示す図である。It is a figure which shows the structure of the wireless communication system of Embodiment 1 of this disclosure. 図１に示す無線通信システムに含まれる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 configured inside the software defined radio included in the wireless communication system shown in FIG. 1. 図２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．
［実施の形態１の構成］
　図１は、本開示の実施の形態１の無線通信システムの一例を示す。図１に示す無線通信システムは、二台のソフトウェア無線機１０－１、１０－２を含んでいる。これら二台のソフトウェア無線機１０－１、１０－２は、同じ構成を有している。以下、それらを区別する必要が無い場合は、「ソフトウェア無線機１０」の呼称を用いて説明を進める。 Embodiment 1.
[Structure of Embodiment 1]
FIG. 1 shows an example of a wireless communication system according to the first embodiment of the present disclosure. The wireless communication system shown in FIG. 1 includes two software defined radios 10-1 and 10-2. These two software defined radios 10-1 and 10-2 have the same configuration. Hereinafter, when it is not necessary to distinguish between them, the description will proceed using the name of "software defined radio 10".
　ソフトウェア無線機１０－１はアンテナ１２－１に接続されている。一方、ソフトウェア無線機１０－２は、アンテナ１２－２に接続されている。二台のアンテナ１２－１、１２－２は同一の構成を有しており、同じアンテナ利得Gを有している。ソフトウェア無線機１０－１，１０－２は、アンテナ１２－１，１２－２を介して無線で通信することができる。以下、二つのアンテナを区別する必要が無い場合は、それらを「アンテナ１２」と称して説明を進める。 Software defined radio 10-1 is connected to antenna 12-1. On the other hand, the software defined radio 10-2 is connected to the antenna 12-2. The two antennas 12-1 and 12-2 have the same configuration and have the same antenna gain G. The software defined radios 10-1 and 10-2 can communicate wirelessly via the antennas 12-1 and 12-2. Hereinafter, when it is not necessary to distinguish between the two antennas, they will be referred to as "antenna 12" and the description will proceed.
　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おり、必要に応じて、無線通信に利用する周波数帯および通信方式を変更することができる。ソフトウェア無線機１０は、例えば、移動体通信の基地局として用いることができる。 The software defined radio 10 is equipped with hardware that can be reconfigured by software, and the frequency band and communication method used for wireless communication can be changed as needed. The software defined radio 10 can be used, for example, as a base station for mobile communication.
　図１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. 1, 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FPGA１４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 a high frequency signal between the antenna 12 and the FPGA 14.
　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に要求される通信の状態を検知し、その状態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 communication state required for the software defined radio 10, and reconfigures the hardware corresponding to the state.
　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１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（WiFi（登録商標）方式、LTE方式等）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. 1, the software defined radio 10 is configured with hardware corresponding to three communication methods A to C (WiFi (registered trademark) method, LTE method, etc.).
　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１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. 1, 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１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. 1 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 transmits the signals received by the antenna 12 to the communication lines 22, 24, 26. It can be converted into data or audio signals via.
　本実施形態では、ソフトウェア無線機１０は、データや音声信号の通信を開始する前に、通信相手のソフトウェア無線機１０に対して、パケット２８－１、２８－２を送信する。以下、二つのパケット２８－１，２８－２を区別する必要が無い場合は、それらを「パケット２８」と称して説明を進める。パケット２８は、既定の送信出力Ptで送信される。また、パケット２８には、送信出力Ptの情報が埋め込まれる。 In the present embodiment, the software defined radio 10 transmits packets 28-1 and 28-2 to the software defined radio 10 of the communication partner before starting the communication of data and voice signals. Hereinafter, when it is not necessary to distinguish between the two packets 28-1 and 28-2, they will be referred to as "packets 28" and the description will proceed. The packet 28 is transmitted with the default transmission output Pt. Further, the information of the transmission output Pt is embedded in the packet 28.
　ソフトウェア無線機１０は、メモリ３０を内蔵している。本実施形態では、ソフトウェア無線機１０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ことを想定している。日本国では、無線装置から３ｍ離れた位置における電波強度が総務省の定める許容値以下である場合は、その装置が微弱無線局として認められる。メモリ３０には、周波数をパラメータとして定められている、その許容値についての情報が格納されている。 The software defined radio 10 has a built-in memory 30. In the present embodiment, it is assumed that the software defined radio 10 is used as a weak radio station that does not require notification as a radio station. In Japan, if the radio field strength at a position 3 m away from the radio device is less than the permissible value set by the Ministry of Internal Affairs and Communications, the device is recognized as a weak radio station. The memory 30 stores information about the permissible value, which is defined with the frequency as a parameter.
［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、上記の許容値以下に抑える必要がある。また、本実施形態で使用されるアンテナ１２は、広帯域の周波数に対応したものであるが、このアンテナ１２の利得は、通信に用いる電波の周波数によって変化する。３ｍ離れた位置での電界強度は、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 the above allowable value or less. Further, the antenna 12 used in the present embodiment corresponds to a wide band frequency, and the gain of the antenna 12 changes depending on the frequency of the radio wave used for communication. The electric field strength at a position 3 m away varies 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．通信の開始前に、ユーザに、アンテナ１２－１、１２－２間の距離dの入力を求める。
　５．ユーザは、入力インターフェースを介して、距離dを入力することができる。距離ｄが入力されると、使用する周波数帯毎に、公知の自由空間伝搬損失の式に従って、アンテナ１２から距離dの位置における伝搬損失 Ldが算出される。
　６．同様の算出手法で、使用する周波数帯毎に、アンテナ１２から３ｍ離れた位置における伝搬損失Lが算出される。 4. Before starting communication, the user is requested to input the distance d between the antennas 12-1 and 12-2.
5. The user can enter the distance d via the input interface. When the distance d is input, the propagation loss Ld at the position of the distance d from the antenna 12 is calculated according to the known free space propagation loss equation for each frequency band used.
6. By the same calculation method, the propagation loss L at a position 3 m away from the antenna 12 is calculated for each frequency band used.
　７．通信相手のソフトウェア無線機１０に、既定の送信出力Ptでパケット２８を送信する。パケット２８には、送信出力Ptの情報が含められる。
　８．パケット２８を受信すると、その受信レベルRtを測定すると共に、受信したパケット２８から送信出力Ptを抽出する。
　９．微弱無線局について規定されている、距離３ｍの位置での電界強度の許容値Rの情報をメモリ３０内に保有する。 7. The packet 28 is transmitted to the software defined radio 10 of the communication partner with the default transmission output Pt. The packet 28 includes information on the transmission output Pt.
8. When the packet 28 is received, the reception level Rt is measured and the transmission output Pt is extracted from the received packet 28.
9. The memory 30 holds information on the permissible value R of the electric field strength at a position at a distance of 3 m, which is defined for a weak radio station.
　１０．以下の関係式に基づいてアンテナ１２の利得Gを計算する。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。
　　　　　　　Rt ＝ Pt ＋ 2 × G － Ld　　・・・（１）
　ここで、Rtは、上記の通り受信レベルである。また、Ptは送信出力であり、２×Gは送信側および受信側のアンテナ１２の利得である。更に、Ldは距離dにおける伝搬損失、つまり受信位置における伝搬損失である。上記（１）式を利得Gについて整理すると次式となる。
　　　　　　　G ＝ (Rt ＋ Ld－ Pt）/ 2　　・・・（２）
　ソフトウェア無線機１０は、具体的には、上記（２）式に従ってアンテナ１２の利得Gを算出する。 10. The gain G of the antenna 12 is calculated based on the following relational expression. The formula used in the description of the present disclosure is a calculation formula in dB notation.
Rt ＝ Pt ＋ 2 × G － Ld ・ ・ ・ (1)
Here, Rt is the reception level as described above. Further, Pt is the transmission output, and 2 × G is the gain of the antenna 12 on the transmitting side and the receiving side. Further, Ld is the propagation loss at the distance d, that is, the propagation loss at the receiving position. The following equation can be obtained by rearranging the above equation (1) with respect to the gain G.
G = (Rt + Ld－ Pt) / 2 ・ ・ ・ (2)
Specifically, the software defined radio 10 calculates the gain G of the antenna 12 according to the above equation (2).
　１１．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。
　　　　　　　P ＝ R － (Rt ＋ Ld－ Pt）/ 2 ＋ L　　　・・・（３）
　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
　　　　　　　   ＝ P ＋ (Rt ＋ Ld－ Pt）/ 2 － L　　　・・・（４）
　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（４）式をPについて整理すると、上記（３）式が得られる。従って、上記（３）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。 11. Based on the following relational expression, the transmission power P for satisfying the condition of the weak radio station is calculated.
P = R- (Rt + Ld-Pt) / 2 + L ... (3)
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
= P + (Rt + Ld－ Pt) / 2 － L ・ ・ ・ (4)
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 (4) for P, the above equation (3) can be obtained. Therefore, according to the above equation (3), the maximum transmission power P satisfying the condition of the weak radio station can be calculated.
　１２．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。 12. 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２は、上記の機能を実現するために図１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２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、アンテナ１２－１を介して送信する。ソフトウェア無線機１０は、また、電波受信部３４を備えている。電波受信部３４は、アンテナ１２－１が受信した無線信号を、受信信号に復調して外部機器に提供する。 [Specific configuration of embodiment 1]
FIG. 2 is a block diagram for explaining elements configured inside the software defined radio 10 shown in FIG. 1 in order to realize the above functions.
As shown in FIG. 2, 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 transmits the data or the like via the antenna 12-1. The software defined radio 10 also includes a radio wave receiving unit 34. The radio wave receiving unit 34 demodulates the radio signal received by the antenna 12-1 into a received signal and provides it to an external device.
　ソフトウェア無線機１０は、パケット生成部３６を備えている。パケット生成部３６は、通信の開始に先立って、予め決めておいた送信出力Ptを記載したパケット２８を、その送信出力Ptにて送信するように、電波送信部３２に指示する。 The software defined radio 10 includes a packet generation unit 36. Prior to the start of communication, the packet generation unit 36 instructs the radio wave transmission unit 32 to transmit the packet 28 in which the predetermined transmission output Pt is described by the transmission output Pt.
　ソフトウェア無線機１０は、回線情報選択部３８を備えている。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に対応する通信回線を設定する。 The software defined radio 10 includes a 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 sets the communication line corresponding to the input communication method and frequency band.
　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用いる通信回線を設定する。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 sets a communication line using the communication method and frequency band obtained as a result of the search. .. As a result, a communication line that meets the user's request for communication is set.
　メモリ３０には、上記の通り、微弱無線局が満たすべき電界強度の許容値に関する情報が格納されている。本実施形態では、日本国の総務省が定める微弱無線局の規定が格納されている。具体的には、無線設備から３ｍの距離での電界強度の許容値Rの情報が周波数毎に保有されている。 As described above, the memory 30 stores information regarding the permissible value of the electric field strength to be satisfied by the weak radio station. In this embodiment, the provisions of a weak radio station set by the Ministry of Internal Affairs and Communications of Japan are stored. Specifically, information on the permissible value R of the electric field strength at a distance of 3 m from the radio equipment is held for each frequency.
　メモリ３０に格納されている許容値Rの情報は、送信電力算出部４２に提供される。送信電力算出部４２は、その許容値Rと、アンテナ１２の利得Gと、３ｍの距離での伝搬損失Lとに基づいて、上記（３）式に従って所要の送信電力Pを算出する。 The information of the allowable value R stored in the memory 30 is provided to the transmission power calculation unit 42. The transmission power calculation unit 42 calculates the required transmission power P according to the above equation (3) based on the permissible value R, the gain G of the antenna 12, and the propagation loss L at a distance of 3 m.
　３ｍの距離での伝搬損失Lは、３ｍ伝搬損失算出部４４で計算される。３ｍ伝搬損失算出部４４は、具体的には、回線情報選択部３８で選択された周波数帯でアンテナ１２から３ｍ離れた位置で生ずる伝搬損失Lを、自由空間伝搬損失の式に従って算出する。 The propagation loss L at a distance of 3 m is calculated by the 3 m propagation loss calculation unit 44. Specifically, the 3m propagation loss calculation unit 44 calculates the propagation loss L generated at a position 3 m away from the antenna 12 in the frequency band selected by the line information selection unit 38 according to the formula of the free space propagation loss.
　ソフトウェア無線機１０は、受信レベル測定部４６を備えている。受信レベル測定部４６は、通信相手のソフトウェア無線機１０からパケット２８が送信されてくると、そのパケット２８の受信レベルRtを測定すると共に、そのパケット２８に含まれている送信出力Ptの情報を抽出する。 The software defined radio 10 includes a reception level measuring unit 46. When the packet 28 is transmitted from the software defined radio 10 of the communication partner, the reception level measuring unit 46 measures the reception level Rt of the packet 28 and inputs the information of the transmission output Pt included in the packet 28. Extract.
　受信レベル測定部４６が取得した受信レベルRtおよび送信出力Ptの情報は、アンテナ利得算出部４８に提供される。アンテナ利得算出部４８は、それらRtおよびPtと、距離dにおける伝搬損失Ldとに基づいて、上記（２）式によりアンテナ利得Gを算出する。算出されたアンテナ利得Gの情報は、上述した送信電力算出部４２に提供される。 The information of the reception level Rt and the transmission output Pt acquired by the reception level measurement unit 46 is provided to the antenna gain calculation unit 48. The antenna gain calculation unit 48 calculates the antenna gain G by the above equation (2) based on those Rt and Pt and the propagation loss Ld at the distance d. The calculated antenna gain G information is provided to the transmission power calculation unit 42 described above.
　距離dにおける伝搬損失Ldは、伝搬損失算出部５０により算出される。伝搬損失算出部５０には、無線装置間の距離dに関するユーザ入力、が提供される。伝搬損失算出部５０は、回線情報選択部３８で選択された周波数帯で、アンテナ１２から距離dだけ離れた位置で生ずる伝搬損失Ldを、自由空間伝搬損失の式に従って算出する。 The propagation loss Ld at the distance d is calculated by the propagation loss calculation unit 50. The propagation loss calculation unit 50 is provided with a user input regarding a distance d between wireless devices. The propagation loss calculation unit 50 calculates the propagation loss Ld generated at a position separated from the antenna 12 by a distance d in the frequency band selected by the line information selection unit 38 according to the free space propagation loss equation.
　図３は、図２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。この処理は、同じアンテナ１２を有するソフトウェア無線機１０を所定の距離dだけ離間した位置に配置して、それらが通信を開始する前に実行されるものとする。 FIG. 3 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. It is assumed that this process is performed before the software defined radios 10 having the same antenna 12 are arranged at positions separated by a predetermined distance d and they start communication.
　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）。選択された通信方式および周波数帯は、予め決めておいた方法で通信相手のソフトウェア無線機１０－２との間で共有される。 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). The selected communication method and frequency band are shared with the software defined radio 10-2 of the communication partner by a predetermined method.
　次に、アンテナ間の距離ｄに関するユーザ入力５２が受け付けられる（ステップ１０２）。ユーザは、この処理に先立ってアンテナ間の距離dを測定しており、ここでは、その測定の結果を入力する。 Next, the user input 52 regarding the distance d between the antennas is accepted (step 102). The user measures the distance d between the antennas prior to this process, and here, the result of the measurement is input.
　次に、上記ステップ１００で選択された周波数帯について、アンテナ１２から距離dの位置で生ずる伝搬損失Ldが算出される（ステップ１０４）。 Next, for the frequency band selected in step 100, the propagation loss Ld generated at the position of the distance d from the antenna 12 is calculated (step 104).
　次いで、予め定めておいた送信出力Ptで、送信相手のソフトウェア無線機１０に向けてパケット２８が送信される（ステップ１０６）。パケット２８には、上記の通り送信出力Ptの情報が含まれている。 Next, the packet 28 is transmitted to the software defined radio 10 of the transmission partner at the predetermined transmission output Pt (step 106). The packet 28 contains the information of the transmission output Pt as described above.
　上記の処理に続いて通信相手のソフトウェア無線機１０からパケット２８が送られてくると、そのパケット２８の受信処理がなされる（ステップ１０８）。具体的には、パケット２８に含まれている送信出力Ptの情報が抽出されると共に、そのパケット２８の受信レベルRtが測定される。 When the packet 28 is sent from the software defined radio 10 of the communication partner following the above processing, the reception processing of the packet 28 is performed (step 108). Specifically, the information of the transmission output Pt included in the packet 28 is extracted, and the reception level Rt of the packet 28 is measured.
　次に、アンテナ利得Gが算出される（ステップ１１０）。具体的には、ステップ１０８で測定した受信レベルRt、ステップ１０４で算出した伝搬損失Ld、ステップ１０８で抽出した送信出力Ptを上記（２）式に代入することで、利得Gが算出される。 Next, the antenna gain G is calculated (step 110). Specifically, the gain G is calculated by substituting the reception level Rt measured in step 108, the propagation loss Ld calculated in step 104, and the transmission output Pt extracted in step 108 into the above equation (2).
　利得Gの算出が終わると、アンテナ１２から３ｍ離れた位置での伝搬損失Lが算出される（ステップ１１２）。 When the calculation of the gain G is completed, the propagation loss L at a position 3 m away from the antenna 12 is calculated (step 112).
　更に、微弱無線局に許容される電界強度の許容値Rが読み出される（ステップ１１４）。より詳細には、上記ステップ１００で選択された周波数において、微弱無線局として認められる３ｍ位置での許容値Rが、メモリ３０から読み出される。 Further, the permissible value R of the electric field strength permissible for the weak radio station is read out (step 114). More specifically, at the frequency selected in step 100, the permissible value R at the 3 m position recognized as a weak radio station is read from the memory 30.
　以上の処理が終わると、３ｍ位置での電界強度を許容値Rに収める最大の送信電力Pが算出される（ステップ１１６）。具体的には、ステップ１１０で算出したアンテナ利得G、ステップ１１２で算出した３ｍ伝搬損失L、およびステップ１１４で読み出した許容値Rを、上記（２）式および（３）式に代入することで送信電力Pが算出される。 When the above processing is completed, the maximum transmission power P that keeps the electric field strength at the 3 m position within the allowable value R is calculated (step 116). Specifically, by substituting the antenna gain G calculated in step 110, the 3 m propagation loss L calculated in step 112, and the permissible value R read in step 114 into the above equations (2) and (3). The transmission power P 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て、送信電力Pでの通信が開始される（ステップ１１８）。 After the transmission power P is calculated, communication with the transmission power P is started using the communication method and frequency band selected in step 100 (step 118).
　以上説明した通り、本実施形態の通信システムでは、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 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１の変形］
　ところで、上述した実施の形態１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]
By the way, in the above-described first embodiment, 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 first embodiment described above, 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では、対抗して配置した二台のソフトウェア無線機１０において、夫々送信電力Pを算出させることとし、双方の無線機に、夫々パケット２８を送信させることとしている。しかしながら、本開示はこれに限定されるものではない。例えば、ソフトウェア無線機１０―１だけに送信電力Pを算出させればよい状況下では、ソフトウェア無線機１０－１からソフトウェア無線機１０－２にパケット２８を送信する必要はない。この場合、ソフトウェア無線機１０－１が実行する処理からは、上記図３に示すフローチャート中、ステップ１０６の処理を省いてもよい。 Further, in the above-described first embodiment, the transmission power P is calculated for each of the two software defined radios 10 arranged in opposition to each other, and the packet 28 is transmitted to both radios. However, the present disclosure is not limited to this. For example, in a situation where only the software defined radio 10-1 needs to calculate the transmission power P, it is not necessary to transmit the packet 28 from the software defined radio 10-1 to the software defined radio 10-2. In this case, the process of step 106 may be omitted from the process executed by the software defined radio 10-1 in the flowchart shown in FIG.
　また、上述した実施の形態１では、既定の送信出力Ptの情報をパケット２８に含めて通信相手のソフトウェア無線機１０に知らせることとしている。しかしながら、本開示はこれに限定されるものではない。送信電力Pを算出するために用いる送信出力Ptを予め決めておけば、その情報をパケット２８に含める処理は省略してもよい。 Further, in the above-described first embodiment, the information of the default transmission output Pt is included in the packet 28 and notified to the software defined radio 10 of the communication partner. However, the present disclosure is not limited to this. If the transmission output Pt used for calculating the transmission power P is determined in advance, the process of including the information in the packet 28 may be omitted.
　また、上述した実施の形態１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 first embodiment described above, 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 options that can be provided to the user are It is 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では、ソフトウェア無線機１０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、より明確には、ソフトウェア無線機１０を微弱無線局として用いる場合、送信電力Pが定まるまでは通信の開始を禁止することと解釈してもよい。 Further, in the first embodiment described above, the software defined radio 10 starts communication after calculating the transmission power P. More specifically, when the software defined radio 10 is used as a weak radio station, this function may be interpreted as prohibiting the start of communication until the transmission power P is determined.
　また、上述した実施の形態１では、二つのアンテナ１２の距離dをユーザが測定して入力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。距離dは、他の公知の手法で無線通信システムの側で測定することとしてもよい。 Further, in the first embodiment described above, the user measures and inputs the distance d between the two antennas 12, but the present disclosure is not limited to this. The distance d may be measured on the side of the wireless communication system by another known method.
　また、上述した実施の形態１では、ソフトウェア無線機１０は、ステップ１１６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 first embodiment described above, the software defined radio 10 starts communication with the transmission power P calculated in step 116, but the present disclosure is not limited to this. For example, the software defined radio 10 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.
１０、１０－１、１０－２　ソフトウェア無線機
１２、１２－１、１２－２　アンテナ
２２、２４、２６　通信回線
２８、２８－１、２８－２　パケット
３０　メモリ
d　装置間距離（アンテナ間距離）
Ld　距離dの位置での伝搬損失
L　距離３ｍの位置での伝搬損失
Rt　受信レベル
Pt　送信出力
P　送信電力
G　アンテナの利得 10, 10-1, 10-2 Software defined radio 12, 12-1, 12-2 Antenna 22, 24, 26 Communication line 28, 28-1, 28-2 Packet 30 Memory
d Distance between devices (distance between antennas)
Ld Propagation loss at distance d
Propagation loss at a position with an L distance of 3 m
Rt reception level
Pt transmit power
P transmission power
G antenna 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、
    　同一のアンテナを備え、アンテナ間に距離dが生ずるように離間して配置される二台のソフトウェア無線機を備え、
    　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他方のソフトウェア無線機と共有する処理と、
    　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、
    　他方のソフトウェア無線機から前記周波数帯で送信されてきた信号の受信レベルRtを検知する処理と、
    　前記他方のソフトウェア無線機が前記信号の送信に用いた送信出力Ptを検知する出力検知処理と、
    　前記距離dを検知する処理と、
    　前記アンテナから距離dの位置で、前記周波数帯において生ずる伝搬損失Ldを算出する処理と、
    　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、
    　前記メモリから、前記周波数帯における前記許容値Rを読み出す処理と、
    　P ＝ R － (Rt ＋ Ld－ Pt）/ 2 ＋ 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.
    Equipped with the same antenna and two software defined radios that are spaced apart so that a distance d is created between the antennas.
    The control unit
    Selection processing to select the communication method and frequency band used for communication,
    The process of sharing the communication method and the frequency band with the other software defined radio,
    Processing that constitutes a communication line using the communication method and the frequency band, and
    Processing to detect the reception level Rt of the signal transmitted in the frequency band from the other software defined radio, and
    Output detection processing that detects the transmission output Pt used by the other software defined radio to transmit the signal, and
    The process of detecting the distance d and
    The process of calculating the propagation loss Ld that occurs in the frequency band at a position d from the antenna, 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.
    The process of reading the allowable value R in the frequency band from the memory and
    The process of calculating the upper limit of the transmission power P according to P = R- (Rt + Ld-Pt) / 2 + L, and
    A wireless communication system that runs.
  2. 　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 claim 1.
  3. 　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、伝送容量の指定を受け付ける処理と、
    　指定された伝送容量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または２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 via the input interface,
    The process of searching for a communication method and frequency band that meets the specified transmission capacity, and
    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 claim 1 or 2.
  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、伝送品質の指定を受け付ける処理と、
    　指定された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 transmission quality designation via the input interface,
    Processing to search for communication methods and frequency bands that meet the specified 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 3.
  5. 　前記他方のソフトウェア無線機は、前記送信出力Ptの情報を含むパケット信号を前記信号として送信し、
    　前記出力検知処理は、前記パケット信号から前記情報を抽出して前記送信出力Ptを検知する処理を含む請求項１乃至４の何れか1項に記載の無線通信システム。     The other software defined radio device transmits a packet signal including the information of the transmission output Pt as the signal.
    The wireless communication system according to any one of claims 1 to 4, wherein the output detection process includes a process of extracting the information from the packet signal and detecting the transmission output Pt.
  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送信電力制御方法であって、
    　同一のアンテナを備え、アンテナ間に距離dが生ずるように離間して二台のソフトウェア無線機を配置するステップと、
    　一方のソフトウェア無線機に、通信に用いる通信方式および周波数帯を選択させるステップと、
    　前記通信方式および前記周波数帯を前記二台のソフトウェア無線機で共有させるステップと、
    　前記二台のソフトウェア無線機に、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させるステップと、
    　他方のソフトウェア無線機に、前記周波数帯で信号を送信させるステップと、
    　前記一方のソフトウェア無線機に、送信されてきた前記信号の受信レベルRtを検知させるステップと、
    　前記一方のソフトウェア無線機に、前記他方のソフトウェア無線機が前記信号の送信に用いた送信出力Ptを検知させるステップと、
    　前記一方のソフトウェア無線機に、前記距離dを検知させるステップと、
    　前記一方のソフトウェア無線機に、前記アンテナから距離dの位置で、前記周波数帯において生ずる伝搬損失Ldを算出させるステップと、
    　前記一方のソフトウェア無線機に、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を算出させるステップと、
    　前記一方のソフトウェア無線機に、前記メモリから、前記周波数帯における前記許容値Rを読み出させるステップと、
    　前記一方のソフトウェア無線機に、P ＝ R － (Rt ＋ Ld－ Pt）/ 2 ＋ L　に従って送信電力Pの上限値を算出させるステップと、
    　を含む送信電力制御方法。     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 a transmission power 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.
    A step of arranging two software defined radios with the same antenna and separated so that a distance d occurs between the antennas.
    A step to let one software defined radio select the communication method and frequency band used for communication,
    A step of sharing the communication method and the frequency band between the two software defined radios,
    A step of making the two software defined radios configure a communication line using the communication method and the frequency band, and
    A step of causing the other software defined radio to transmit a signal in the frequency band,
    A step of causing one of the software defined radios to detect the reception level Rt of the transmitted signal, and
    A step of causing one of the software defined radios to detect the transmission output Pt used by the other software defined radio to transmit the signal.
    The step of causing one of the software defined radios to detect the distance d,
    A step of causing one of the software defined radios to calculate the propagation loss Ld generated in the frequency band at a position d from the antenna.
    The specified distance propagation loss that occurs 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 in the software defined radio. The step to calculate L and
    A step of causing one of the software defined radios to read the allowable value R in the frequency band from the memory.
    A step of causing one of the software defined radios to calculate the upper limit of the transmission power P according to P = R- (Rt + Ld-Pt) / 2 + L.
    Transmission power 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他の無線機と共有する処理と、
    　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、
    　前記他の無線機から前記周波数帯で送信されてきた信号の受信レベルRtを検知する処理と、
    　前記他の無線機が前記信号の送信に用いた送信出力Ptを検知する出力検知処理と、
    　前記他の無線機とのアンテナ間の距離dを検知する処理と、
    　前記アンテナから距離dの位置で、前記周波数帯において生ずる伝搬損失Ldを算出する処理と、
    　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、
    　前記メモリから、前記周波数帯における前記許容値Rを読み出す処理と、
    　P ＝ R － (Rt ＋ Ld－ Pt）/ 2 ＋ 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.
    The control unit
    Selection processing to select the communication method and frequency band used for communication,
    Processing to share the communication method and the frequency band with other radios,
    Processing that constitutes a communication line using the communication method and the frequency band, and
    Processing to detect the reception level Rt of the signal transmitted from the other radio in the frequency band, and
    Output detection processing that detects the transmission output Pt used by the other radio to transmit the signal, and
    The process of detecting the distance d between the antennas of the other radio and the
    The process of calculating the propagation loss Ld that occurs in the frequency band at a position d from the antenna, 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.
    The process of reading the allowable value R in the frequency band from the memory and
    The process of calculating the upper limit of the transmission power P according to P = R- (Rt + Ld-Pt) / 2 + 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送信電力制御用プログラム。
    　     A transmission power control program including a program for realizing the function of the software defined radio according to claim 7 in a computer.
PCT/JP2020/036725 2020-09-28 2020-09-28 Wireless communication system, transmission power control method, software defined radio, and transmission power control program WO2022064717A1 (en)

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