WO2022064709A1 - Radio relay system, radio relay method, software radio machine for radio relay, and radio relay program - Google Patents

Radio relay system, radio relay method, software radio machine for radio relay, and radio relay program Download PDF

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Publication number
WO2022064709A1
WO2022064709A1 PCT/JP2020/036696 JP2020036696W WO2022064709A1 WO 2022064709 A1 WO2022064709 A1 WO 2022064709A1 JP 2020036696 W JP2020036696 W JP 2020036696W WO 2022064709 A1 WO2022064709 A1 WO 2022064709A1
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Prior art keywords
radio
frequency band
outdoor
indoor
communication
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PCT/JP2020/036696
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French (fr)
Japanese (ja)
Inventor
利文 宮城
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日本電信電話株式会社
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Application filed by 日本電信電話株式会社 filed Critical 日本電信電話株式会社
Priority to PCT/JP2020/036696 priority Critical patent/WO2022064709A1/en
Priority to JP2022551109A priority patent/JP7435808B2/en
Publication of WO2022064709A1 publication Critical patent/WO2022064709A1/en

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/14Relay systems
    • H04B7/15Active relay systems
    • H04B7/155Ground-based stations

Definitions

  • This disclosure relates to a radio relay system, a radio relay method, a software defined radio for radio relay, and a program for radio relay, and in particular, a radio relay system for relaying an outdoor radio and an indoor radio, a radio relay method, and a radio relay.
  • Software defined radio and wireless relay programs are provided.
  • Patent Document 1 discloses a wireless data communication system.
  • this wireless data communication system when a worker accesses an arbitrary terminal device and inputs new communication path data peculiar to another terminal device, the terminal device has a unique communication path to the other terminal device. The data is transmitted as a dedicated communication path data transmission command.
  • the other terminal device stores the communication path data received at that time in the storage means, sets and updates its own communication path data, and thereafter performs communication according to the communication path data.
  • the communication path of each terminal device can be communicated from any terminal device without the need for an operator to move to the installation location of each terminal device to set or update the communication path data. Data is set and updated.
  • the present disclosure has been made by paying attention to the above circumstances, and an object of the present invention is to provide a technology for reducing the influence of the communication environment and realizing good communication quality in wireless relay.
  • the present disclosure provides a radio relay system including an outdoor radio, an indoor radio, and a relay radio that relays them in order to achieve the above object.
  • the relay radio is configured as a software defined radio
  • the outdoor radio and the indoor radio are configured so that the frequency band to be used can be selected from a plurality of frequency bands.
  • the relay radio and the outdoor radio collaborate to execute the outdoor communication preparation process and the outdoor communication start process.
  • the interference and noise detected when the relay radio and the outdoor radio are not communicating are below the threshold value, and the communication partner received by at least one of the relay radio and the outdoor radio.
  • An outdoor communication frequency band in which the reception level of the radio wave from the radio wave is relatively high and the C / N of the radio wave is equal to or higher than the threshold value is searched for.
  • the outdoor communication start process communication between the relay radio and the outdoor radio is started using the frequency band for outdoor communication searched in the outdoor communication preparation process.
  • outdoor communication is defined as wireless communication between an outdoor radio and a relay radio.
  • the relay radio and the indoor radio collaborate to execute the indoor communication preparation process and the indoor communication start process.
  • the interference and noise detected when the relay radio and the indoor radio are not communicating are below the threshold value, and the communication partner received by at least one of the relay radio and the indoor radio.
  • An indoor communication frequency band in which the reception level of the radio wave from the radio wave is relatively high and the C / N of the radio wave is equal to or higher than the threshold value is searched for.
  • the indoor communication start process communication between the relay radio and the indoor radio is started using the frequency band for indoor communication searched in the indoor communication preparation process.
  • indoor communication is defined as wireless communication between an indoor radio and a relay radio.
  • the present disclosure provides a radio relay method in which an outdoor radio and an indoor radio are relayed by a relay radio.
  • the relay radio is a software defined radio
  • the outdoor radio and the indoor radio can select a frequency band to be used from a plurality of frequency bands.
  • the wireless relay method includes an outdoor communication step in which communication is performed between the relay radio and the outdoor radio, and an indoor communication step in which communication is performed between the relay radio and the indoor radio.
  • the outdoor communication step includes an outdoor communication preparation step and an outdoor communication start step.
  • the outdoor communication preparation step the interference and noise detected when the relay radio and the outdoor radio are not communicating are below the threshold value, and the communication partner received by at least one of the relay radio and the outdoor radio.
  • the outdoor communication start step communication is started between the relay radio and the outdoor radio using the searched frequency band for outdoor communication.
  • the indoor communication step includes an indoor communication preparation step and an indoor communication start step.
  • the indoor communication preparation step the interference and noise detected when the relay radio and the indoor radio are not communicating are below the threshold value, and the communication partner received by at least one of the relay radio and the indoor radio.
  • the indoor communication start step communication is started between the relay radio and the indoor radio using the searched frequency band for indoor communication.
  • the present disclosure provides a software defined radio for wireless relay according to the first aspect and a software defined radio for wireless relay according to the second aspect.
  • the software defined radio for radio relay of the first aspect is a software defined radio that relays an outdoor radio and an indoor radio configured so that the frequency band to be used can be selected from a plurality of frequency bands.
  • the software defined radio for wireless relay is connected to an outdoor communication transceiver that communicates with an outdoor radio, an indoor communication transceiver that communicates with an indoor radio, and an outdoor communication transceiver and an indoor communication transceiver. It also has a signal processing unit. In the signal processing unit, software that changes the frequency band used for communication with the outdoor radio and the frequency band used for communication with the indoor radio operates.
  • the signal processing unit executes the first frequency band search process, the second frequency band search process, and the outdoor communication start process in the communication with the outdoor radio.
  • the carrier sense searches for the first frequency band in which the interference and noise detected in the state of not communicating with the outdoor radio are equal to or less than the threshold value.
  • the second frequency band search process a second frequency band having a relatively high reception level and a C / N equal to or higher than the threshold value is searched for based on the radio waves transmitted from the outdoor radio. Then, in the outdoor communication start processing, the outdoor communication transmission / reception unit is controlled so as to communicate with the outdoor radio using the frequency band in which the first frequency band and the second frequency band overlap.
  • the signal processing unit executes the third frequency band search process, the fourth frequency band search process, and the indoor communication start process in the communication with the indoor radio.
  • the third frequency band search process the third frequency band in which the interference and noise detected in the state of not communicating with the outdoor radio are equal to or less than the threshold value is searched by carrier sense.
  • the fourth frequency band search process a fourth frequency band whose reception level is relatively high and whose C / N is equal to or higher than the threshold value is searched based on the radio waves transmitted from the indoor radio. Then, in the indoor communication start processing, the indoor communication transmission / reception unit is controlled so as to communicate with the indoor radio using the frequency band in which the third frequency band and the fourth frequency band overlap.
  • the software defined radio for wireless relay of the second aspect is a software defined radio that relays an outdoor radio and an indoor radio that use the software defined radio.
  • the software defined radio for wireless relay is connected to an outdoor communication transceiver that communicates with an outdoor radio, an indoor communication transceiver that communicates with an indoor radio, and an outdoor communication transceiver and an indoor communication transceiver. It also has a signal processing unit. In the signal processing unit, software that changes the frequency band used for communication with the outdoor radio and the frequency band used for communication with the indoor radio operates.
  • the signal processing unit executes the first common frequency band search process, the second common frequency band search process, and the outdoor communication start process in the communication with the outdoor radio.
  • the first common frequency band search process the first common frequency at which the level of interference and noise detected by both the software defined radio for wireless relay and the outdoor radio is below the threshold when not communicating with the outdoor radio.
  • the band is searched by carrier sense in cooperation with the outdoor radio.
  • the second common frequency band search process among the searched first common frequency bands, the reception level is relatively high in both the wireless relay software defined radio and the outdoor radio, and the C / N becomes equal to or higher than the threshold value. 2
  • a common frequency band is searched for in collaboration with an outdoor radio. Then, in the outdoor communication start processing, the outdoor communication transmission / reception unit is controlled so as to communicate with the outdoor radio using the searched second common frequency band.
  • the signal processing unit executes the third common frequency band search process, the fourth common frequency band search process, and the indoor communication start process in the communication with the indoor radio.
  • the level of interference and noise detected by both the software defined radio for wireless relay and the indoor radio is equal to or less than the threshold value in the state of not communicating with the indoor radio.
  • the band is searched by carrier sense in cooperation with the indoor radio.
  • the reception level is relatively high in both the wireless relay software defined radio and the indoor radio, and the C / N becomes equal to or higher than the threshold value. 4 Common frequency bands are searched for in collaboration with indoor radios. Then, in the indoor communication start processing, the indoor communication transmission / reception unit is controlled so as to communicate with the indoor radio using the searched fourth common frequency band.
  • the present disclosure provides a program for wireless relay in order to achieve the above object.
  • the present wireless relay program includes a program for realizing the function of the wireless relay software defined radio of the first aspect or the function of the wireless relay software defined radio of the second aspect to the computer.
  • FIG. 1 It is a block diagram for demonstrating the function of the outdoor radio and the indoor radio shown in FIG. It is a flowchart for demonstrating the content of the process executed between the outdoor radio and the relay radio in the wireless relay system shown in FIG. It is a flowchart for demonstrating the content of the process executed between an indoor radio and a relay radio in the wireless relay system shown in FIG.
  • FIG. 1 is a diagram for explaining an outline of a wireless relay system according to the first embodiment of the present disclosure.
  • the wireless relay system 2 is a system that relays wireless communication between an outdoor radio 4 installed outdoors and an indoor radio 6 installed indoors. Between indoors and outdoors, there is a physical boundary surface 8 such as a wall or a window of a house.
  • the wireless relay system 2 includes a relay radio 10 on the boundary surface 8 of the house.
  • the relay radio 10 can not only relay one outdoor radio 4 and one indoor radio 6, but also relay one outdoor radio 4 and a plurality of indoor radios 6. can.
  • the relay radio 10 can be installed both indoors and outdoors.
  • the relay radio 10 may be attached to the boundary surface 8 or may be installed near the boundary surface 8. In the present embodiment, it is assumed that the relay radio 10 is attached to the indoor side of the boundary surface 8.
  • FIG. 2 is a diagram showing the relationship between the transmission coefficient, the incident angle, and the frequency band in glass, which is generally used as a material for the boundary surface 8 of a house.
  • the solid line shows the relationship between the transmission coefficient and the frequency band when the incident angle is zero
  • the dotted line, the alternate long and short dash line, and the broken line show the relationship between the transmission coefficient and the frequency band when the incident angle is larger than zero.
  • the larger the incident angle the smaller the transmission coefficient.
  • the transmission coefficient changes by drawing a sinusoidal curve with respect to the frequency.
  • the relationship between the transmission coefficient and the frequency band and the relationship between the transmission coefficient and the incident angle differ depending on the material. Due to the characteristics shown in FIG. 2, when the relay radio 10 is installed indoors, the place where the distance from the outdoor radio 4 is closest is set as the installation place, so that the attenuation of the radio wave at the boundary surface 8 is suppressed. be able to. Once the installation location of the relay radio 10 is decided, the transmission loss depends on the frequency. Therefore, by appropriately selecting the frequency band used for wireless communication, it is possible to realize good communication quality even in a communication environment sandwiching a wall or a window.
  • a software defined radio is used as a means for appropriately selecting a frequency band.
  • the software defined radio 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 relay radio 10 is configured as a software defined radio.
  • the relay radio 10 which is a software defined radio has a function of determining a frequency band to be used for communication with the outdoor radio 4 and starting communication in the determined frequency band.
  • the relay radio 10 has a function for determining the communication conditions at the installation position of each indoor radio 6, for example, line-of-sight communication and non-line-of-sight communication. Further, the relay radio 10 has a function of determining a frequency band used for communication with each indoor radio 6 for each indoor radio 6 according to communication conditions and starting communication in the determined frequency band. Have.
  • the outdoor radio 4 and the indoor radio 6 are configured so that the frequency band required for wireless communication with the relay radio 10 can be selected from a plurality of frequency bands.
  • the outdoor radio 4 and the indoor radio 6 do not necessarily have to be software defined radios.
  • the outdoor radio 4 and the indoor radio 6 include a plurality of hardware having different frequency bands used for communication, and are configured to select the frequency band by changing the hardware.
  • the transmission loss at the boundary surface 8 of the house is small due to the cooperation between the relay radio 10 and the outdoor radio 4 and the cooperation between the relay radio 10 and the indoor radio 6.
  • a frequency band where good communication quality can be obtained is searched.
  • the influence of interference and noise from other radios is small among the frequency bands that can be selected by the outdoor radio 4, and the relay radio 10 receives the radio waves.
  • a wide band frequency band in which the reception level of the radio wave from the outdoor radio 4 is relatively high and the C / N of the radio wave is high is searched for.
  • the influence of interference and noise from other radios is small among the frequency bands that can be selected by the indoor radio 6, and the reception is received by the relay radio 10.
  • a wide band frequency band in which the reception level of the radio wave from the indoor radio 6 is relatively high and the C / N of the radio wave is high is searched for for each indoor radio 6.
  • the functions of the relay radio 10 related to the search for the frequency band will be described in detail in the following chapters.
  • the relay radio 10 which is a software defined radio can adopt a communication method capable of communicating with a small transmission power in addition to using a frequency band which is less affected by interference and noise in order to save power.
  • the relay radio 10 may be a radio having a very small power consumption such as a weak radio station, the relay radio 10 may be operated by a battery.
  • FIG. 3 is a block diagram for specifically explaining the function of the relay radio 10.
  • the relay radio 10 corresponds to a software defined radio for radio relay according to the first aspect of the present disclosure.
  • the relay radio 10 includes an outdoor communication antenna 12 for communicating with the outdoor radio 4 and an indoor communication antenna 14 for communicating with the indoor radio 6.
  • outdoor communication means wireless communication between an outdoor radio and a relay radio
  • indoor communication means wireless communication between an indoor radio and a relay radio. be.
  • the relay radio 10 includes a radio wave transmitting unit 32 and a radio wave receiving unit 34 connected to the outdoor communication antenna 12.
  • the radio wave transmitting unit 32 transmits radio waves for the outdoor radio device 4, and the radio wave receiving unit 34 receives radio waves from the outdoor radio device 4.
  • the radio wave transmission unit 32 has a D / A converter that converts a digital baseband signal into an analog signal, and an analog baseband signal produced by the D / A converter in a frequency band for outdoor communication, which will be described later. It is provided with a high frequency unit that is converted and transmitted from the outdoor communication antenna 12.
  • the radio wave receiving unit 34 has a high frequency unit that converts the radio signal received from the outdoor communication antenna 12 into a baseband signal that is easy to perform digital signal processing, and an A / that converts an analog baseband signal into a digital signal. It is equipped with a D converter.
  • the high frequency section of the radio wave transmitting section 32 and the high frequency section of the radio wave receiving section 34 can be integrated.
  • the radio wave transmitting unit 32 and the radio wave receiving unit 34 correspond to an outdoor communication transmitting / receiving unit included in the software defined radio for radio relay according to the first aspect of the present disclosure.
  • the relay radio 10 includes a radio wave transmitting unit 36 and a radio wave receiving unit 38 connected to the indoor communication antenna 14.
  • the radio wave transmitting unit 36 transmits radio waves for the indoor radio device 6, and the radio wave receiving unit 38 receives radio waves from the indoor radio wave device 6.
  • the radio wave transmission unit 36 sets the D / A converter that converts the digital baseband signal into an analog signal and the analog baseband signal produced by the D / A converter into the frequency band for indoor communication described later. It is provided with a high frequency unit that is converted and transmitted from the indoor communication antenna 14.
  • the radio wave receiving unit 38 has a high frequency unit that converts the radio signal received from the indoor communication antenna 14 into a baseband signal that is easy to perform digital signal processing, and an A / that converts an analog baseband signal into a digital signal. It is equipped with a D converter.
  • the high frequency section of the radio wave transmitting section 36 and the high frequency section of the radio wave receiving section 38 can be integrated.
  • the radio wave transmitting unit 36 and the radio wave receiving unit 38 correspond to an indoor communication transmitting / receiving unit included in the software defined radio for radio relay according to the first aspect of the present disclosure.
  • the relay radio 10 further includes a signal processing unit 20.
  • the radio wave transmitting unit 32 and the radio wave receiving unit 34 are connected to the signal processing unit 20, and the radio wave transmitting unit 36 and the radio wave receiving unit 38 are also connected to the signal processing unit 20.
  • the signal processing unit 20 corresponds to the signal processing unit included in the software defined radio for wireless relay according to the first aspect of the present disclosure.
  • the signal processing unit 20 includes hardware and software (program).
  • the hardware constituting the signal processing unit 20 may be, for example, a general-purpose processing device such as a CPU or MPU, a digital signal processing device (DSP), or a field programmable gate array (FPGA).
  • DSP digital signal processing device
  • FPGA field programmable gate array
  • the signal processing unit 20 may perform arbitrary processing such as signal coding / decoding, input / output processing, data processing, etc., which enables the relay radio 10 to perform wireless communication. Can be executed.
  • the signal processing unit 20 is drawn as a component separate from the radio wave transmitting units 32 and 36 and the radio wave receiving units 34 and 38.
  • the signal processing unit 20, the radio wave transmitting units 32 and 36, and the radio wave receiving units 34 and 38 may be integrated into one electronic component.
  • the signal processing unit 20 operates software that changes the frequency band and communication method used for communication with the outdoor radio 4 and changes the frequency band and communication method used for communication with the indoor radio 6. By the operation of this software, the signal processing unit 20 functions as a frequency band search unit 22 and also as a communication method selection unit 24.
  • the frequency band search unit 22 searches for a frequency band that can provide good communication quality in communication with the outdoor radio 4. First, the frequency band search unit 22 searches for a frequency band that is less affected by interference and noise from others by carrier sense. Further, the frequency band search unit 22 receives the radio wave from the outdoor radio 4 and searches for a wide band frequency band having a high reception level and a C / N equal to or higher than the threshold value. The common part of the frequency band obtained by these two searches is the frequency band capable of providing good communication quality.
  • the signal processing unit 20 controls the radio wave transmitting unit 32 and the radio wave receiving unit 34 so as to communicate with the outdoor radio 4 using the frequency band searched by the frequency band searching unit 22.
  • the frequency band search unit 22 performs the same processing in the communication with the indoor radio 6, and searches for a frequency band that can provide good communication quality in the communication with the indoor radio 6. However, when a plurality of indoor radios 6 are installed, the frequency band search unit 22 searches for a frequency band for each indoor radio 6.
  • the signal processing unit 20 controls the radio wave transmitting unit 36 and the radio wave receiving unit 38 so as to communicate with the indoor radio 6 using the frequency band searched by the frequency band searching unit 22.
  • the communication method selection unit 24 selects a power-saving communication method when communication with the outdoor radio device 4 and the indoor radio device 6 is started using the frequency band searched by the frequency band search unit 22. ..
  • a communication method includes, for example, a modulation method having a small number of multivalues that can be received at a low C / N.
  • the communication method selection unit 24 controls the radio wave transmission unit 32 and the radio wave reception unit 34, and the radio wave transmission unit 36 and the radio wave reception unit 38 so that communication is performed by the selected communication method.
  • FIG. 4 is a flowchart for explaining the contents of the process executed between the outdoor radio device 4 and the relay radio device 10 in the wireless relay system 2.
  • the frequency band to be used is determined between the two.
  • FIG. 4 shows a procedure for searching for a frequency band used for outdoor communication and starting communication in the searched frequency band.
  • the relay radio 10 searches for the frequency band A in which interference and noise are equal to or less than the threshold value by carrier sense (step S10). Specifically, the relay radio 10 selects a reception mode in a state where communication with the outdoor radio 4 is not performed, and measures the reception power in each frequency band that the relay radio 10 can use. The received power measured here represents the level of interference or noise. The relay radio 10 compares the received power with the threshold value for each frequency band, and searches for the frequency band A in which the received power is equal to or less than the threshold value.
  • the threshold value used in carrier sense is the received power at which it can be determined that another radio device is not using the frequency band.
  • the frequency band A searched in step S10 corresponds to the first frequency band searched in the software defined radio for radio relay according to the first aspect of the present disclosure.
  • the outdoor radio 4 transmits radio waves at a frequency that the outdoor radio 4 can transmit (step S20). Specifically, the outdoor radio 4 selects a frequency band in order from a plurality of frequency bands that can be selected by switching hardware, and transmits radio waves in the selected frequency band.
  • step S12 is performed by the relay radio 10.
  • the relay radio 10 receives the radio wave from the outdoor radio 4, and searches for a frequency band B in which the reception level of the received radio wave is relatively high and the C / N of the radio wave is equal to or higher than the threshold value (step S12). ).
  • the radio wave received from the outdoor radio 4 is limited to the radio wave in the frequency band that can be selected by the outdoor radio 4.
  • the relay radio 10 searches for a frequency band B having a relatively high reception level and a wider band band in the frequency band in which the C / N of the received radio wave is equal to or higher than the threshold value.
  • the frequency band B searched for in step S12 corresponds to the second frequency band searched for in the software defined radio for radio relay according to the first aspect of the present disclosure.
  • the relay radio 10 obtains a frequency band C in which the frequency band A and the frequency band B overlap.
  • the frequency band C is a frequency band that is not used in other radios, has a small transmission loss at the boundary surface 8 of the house, and is less affected by interference and noise, that is, a frequency at which good communication quality can be obtained. It is a band.
  • the frequency band C corresponds to the frequency band for outdoor communication in the wireless relay system and the wireless relay method of the present disclosure.
  • the relay radio 10 notifies the outdoor radio 4 of the frequency band C using a predetermined frequency band (above, step S14).
  • the outdoor radio 4 starts communication in the frequency band C notified by the relay radio 10 (step S22).
  • FIG. 5 is a flowchart for explaining the contents of the process executed between the indoor radio device 6 and the relay radio device 10 in the wireless relay system 2. Similar to the case of the outdoor radio 4, when starting communication between the indoor radio 6 and the relay radio 10, the frequency band to be used is determined between the two. However, when a plurality of indoor radios 6 are installed, the frequency band to be used is determined for each indoor radio 6 according to the procedure shown in FIG. FIG. 5 shows a procedure for searching for a frequency band used for indoor communication and starting communication in the searched frequency band.
  • the relay radio 10 searches for the frequency band D in which interference and noise are equal to or less than the threshold value by carrier sense (step S30). Specifically, the relay radio 10 selects a reception mode in a state where communication with the indoor radio 6 is not performed, and measures the reception power in each frequency band that the relay radio 10 can use. The relay radio 10 compares the received power with the threshold value for each frequency band, and searches for the frequency band D in which the received power is equal to or less than the threshold value.
  • the threshold value used in step S30 does not necessarily have to be the same value as the threshold value used in step S10.
  • the frequency band D searched for in step S30 corresponds to the third frequency band searched for in the software defined radio for radio relay according to the first aspect of the present disclosure.
  • the indoor radio 6 transmits radio waves at a frequency that the indoor radio 6 can transmit (step S40). Specifically, the indoor radio 6 selects a frequency band in order from a plurality of frequency bands that can be selected by switching hardware, and transmits radio waves in the selected frequency band.
  • step S32 is performed by the relay radio 10.
  • the relay radio 10 receives the radio wave from the indoor radio 6, and searches for a frequency band E in which the reception level of the received radio wave is relatively high and the C / N of the radio wave is equal to or higher than the threshold value (step S32). ).
  • the radio wave received from the indoor radio 6 is limited to the radio wave in the frequency band that can be selected by the indoor radio 6.
  • the relay radio 10 searches for a frequency band E having a relatively high reception level and a wider band in the frequency band in which the C / N of the received radio wave is equal to or higher than the threshold value.
  • the frequency band E searched in step S32 corresponds to the fourth frequency band searched in the software defined radio for radio relay according to the first aspect of the present disclosure.
  • the relay radio 10 obtains a frequency band F in which the frequency band D and the frequency band E overlap.
  • the frequency band F is a frequency band in which the best communication quality can be obtained between the indoor radio 6 and the relay radio 10.
  • the frequency band F corresponds to the frequency band for indoor communication in the wireless relay system and the wireless relay method of the present disclosure.
  • the relay radio 10 notifies the indoor radio 6 of the frequency band F using a predetermined frequency band (above, step S34).
  • the indoor radio 6 starts communication in the frequency band F notified by the relay radio 10 (step S42).
  • FIG. 6 is a diagram for explaining the outline of the wireless relay system according to the second embodiment of the present disclosure.
  • the wireless relay system 102 is a system that relays wireless communication between the outdoor wireless device 140 installed outdoors and the indoor wireless device 170 installed indoors by the relay wireless device 110. ..
  • the relay radio 110 relays one outdoor radio 140 and one or a plurality of indoor radios 170. In the present embodiment, it is assumed that the relay radio 110 is attached to the indoor side of the boundary surface 8 of the house.
  • the relay radio 110 is configured as a software defined radio as in the first embodiment. Further, as in the first embodiment, the outdoor radio device 140 and the indoor radio device 170 are configured so that the frequency band to be used can be selected from a plurality of frequency bands. However, in the wireless relay system 102, the outdoor radio 140 and the indoor radio 170 are limited to software defined radios. The outdoor radio 140 and the indoor radio 170, which are software defined radios, have a wider selectable frequency band than the first embodiment, and more communication methods and frequency combinations can be selected. That is, the outdoor radio 140 and the indoor radio 170 have the same functions as those of the relay radio 110.
  • the transmission loss at the boundary surface 8 of the house is small due to the cooperation between the relay radio 110 and the outdoor radio 140 and the cooperation between the relay radio 110 and the indoor radio 170.
  • a frequency band where good communication quality can be obtained is searched.
  • the influence of interference and noise from other radios is small, and the reception level of the radio wave from the outdoor radio 140 received by the relay radio 110 is relative.
  • a wide band frequency band having a high C / N of the radio wave is searched for.
  • the influence of interference and noise from other radios is small, and the reception level of the radio wave from the indoor radio 6 received by the relay radio 110 is relative.
  • a wide band frequency band having a high C / N of the radio wave is searched for for each indoor radio 6.
  • frequency bands 1, 2 and 3 are frequency bands suitable for communication between the relay radio 110 and the outdoor radio 140.
  • a frequency band that cannot be used due to a large transmission loss is sandwiched between the frequency bands 1, 2, and 3. Therefore, in this example, it is not possible to secure a continuous wide band frequency band, and there is a possibility that a desired transmission speed cannot be obtained.
  • by bundling frequency bands 1, 2, and 3 by carrier aggregation it is possible to use a plurality of frequency bands 1, 2, and 3 at the same time.
  • carrier aggregation is performed between the relay radio 110 and the indoor radio 170. Since there is a frequency band that cannot be used due to large diffraction loss in non-line-of-sight communication, it is effective to bundle the frequency bands by carrier aggregation. When a plurality of indoor radios 170 are installed, carrier aggregation is performed for each indoor radio 170. In the example shown in FIG. 6, frequency bands 4, 5 and 6 are bundled with one indoor radio 170, and frequency bands 7, 8 are bundled with another indoor radio 170. ..
  • each of the radios 110, 140, and 170 which are software defined radios, adopts a communication method capable of communicating with a small transmission power in addition to using a frequency band that is less affected by interference and noise in order to save power. be able to.
  • the radios 110, 140, 170 may be radios having very small power consumption such as a weak radio station, the radios 110, 140, 170 may be operated by batteries.
  • FIG. 7 is a block diagram for specifically explaining the function of the relay radio 110.
  • the same elements as those shown in FIG. 3 are designated by a common reference numeral, and the description thereof will be omitted or simplified.
  • the relay radio 110 corresponds to the software defined radio for radio relay according to the second aspect of the present disclosure.
  • the radio wave transmitting unit 32 and the radio wave receiving unit 34 correspond to the outdoor communication transmitting / receiving unit included in the software defined radio for radio relay according to the second aspect of the present disclosure.
  • the radio wave transmitting unit 36 and the radio wave receiving unit 38 correspond to an indoor communication transmitting / receiving unit included in the software defined radio for radio relay according to the second aspect of the present disclosure.
  • the relay radio 110 includes a user setting input unit 128 and a signal processing unit 120.
  • the user setting input unit 128 is a user interface that receives input of various settings to the relay radio 110 from the user 200.
  • the settings that can be input by the user 200 include the transmission speed between the relay radio 110 and the outdoor radio 140 and the indoor radio 170.
  • the user setting input unit 128 sets the input transmission speed desired by the user 200 with respect to the signal processing unit 120. Instead of inputting directly to the user setting input unit 128 by the user 200 itself, the transmission speed desired by the user 200 is acquired by wireless communication from another wireless terminal and set for the signal processing unit 120. May be good.
  • the signal processing unit 120 corresponds to the signal processing unit included in the software defined radio for wireless relay according to the second aspect of the present disclosure.
  • the signal processing unit 120 may be, for example, a general-purpose processing device, a DSP, or an FPGA.
  • the signal processing unit 120 can execute any processing that enables the relay radio 110 to perform wireless communication, such as signal coding / decoding, input / output processing, and data processing.
  • the signal processing unit 120 is drawn as a component separate from the radio wave transmitting units 32 and 36 and the radio wave receiving units 34 and 38.
  • the signal processing unit 120, the radio wave transmitting units 32 and 36, and the radio wave receiving units 34 and 38 may be integrated into one electronic component.
  • the signal processing unit 120 operates software that changes the frequency band and communication method used for communication with the outdoor radio 140 and changes the frequency band and communication method used for communication with the indoor radio 170.
  • the signal processing unit 120 functions as a frequency band search unit 122, a communication method selection unit 124, and further functions as a frequency bandwidth calculation unit 126.
  • the frequency band search unit 122 searches for a frequency band that can provide good communication quality in communication with the outdoor radio 140.
  • the frequency band search unit 122 searches for a frequency band in both the relay radio 110 and the outdoor radio 140 that is less affected by interference and noise from others in a state of not communicating with the outdoor radio 140 by carrier sense. do.
  • the frequency band search unit 122 has a frequency band in which the reception level is relatively high and the C / N is equal to or higher than the threshold value in both the relay radio 110 and the outdoor radio 140 among the frequency bands searched by the carrier sense.
  • the frequency band searched in this way is a frequency band capable of providing good communication quality between the relay radio 110 and the outdoor radio 140.
  • the signal processing unit 120 controls the radio wave transmitting unit 32 and the radio wave receiving unit 34 so as to communicate with the outdoor radio 140 using the frequency band searched by the frequency band searching unit 122.
  • the frequency band search unit 122 performs the same processing in the communication with the indoor radio 170, and searches for a frequency band capable of providing good communication quality in the communication with the indoor radio 170. However, when a plurality of indoor radios 170 are installed, the frequency band search unit 122 searches for a frequency band for each indoor radio 170.
  • the signal processing unit 120 controls the radio wave transmitting unit 36 and the radio wave receiving unit 38 so as to communicate with the indoor radio 170 using the frequency band searched by the frequency band searching unit 122.
  • the transmission speed desired by the user 200 is input from the user setting input unit 128 to the frequency bandwidth calculation unit 126.
  • the frequency bandwidth calculation unit 126 calculates a target frequency bandwidth for realizing the transmission speed (designated transmission speed) desired by the user 200.
  • the frequency band width calculation unit 126 bundles a plurality of frequency bands and performs carrier aggregation. ..
  • the communication method selection unit 124 starts communication with the outdoor radio 140 or the indoor radio 170 using the frequency band searched by the frequency band search unit 122 or the frequency band bundled by the frequency band width calculation unit 126. When this is done, select a communication method that can communicate with low power consumption. For example, the communication method selection unit 124 selects a modulation method having a small number of multivalues that can be received at a low C / N. The communication method selection unit 124 controls the radio wave transmission unit 32 and the radio wave reception unit 34, and the radio wave transmission unit 36 and the radio wave reception unit 38 so that communication is performed by the selected communication method.
  • FIG. 8 is a block diagram for explaining the functions of the outdoor radio 140 and the indoor radio 170. Since the outdoor radio 140 and the indoor radio 170 have a common function, the function of the outdoor radio 140 will be described here as a representative.
  • the outdoor radio 140 is provided with an antenna 142 for communicating with the relay radio 110.
  • the number and types of antennas 142 are not limited as long as the functions required for the outdoor radio 140 can be secured.
  • the outdoor radio 140 includes a radio wave transmitting unit 162 and a radio wave receiving unit 164 connected to the antenna 142.
  • the radio wave transmitting unit 162 transmits the radio wave for the relay radio 110, and the radio wave receiving unit 164 receives the radio wave from the relay radio 110.
  • the radio wave transmitting unit 162 includes a D / A converter and a high frequency unit
  • the radio wave receiving unit 164 includes a high frequency unit and an A / D converter.
  • the high frequency section of the radio wave transmitting section 162 and the high frequency section of the radio wave receiving section 164 can be integrated.
  • the outdoor radio unit 140 further includes a user setting input unit 158 and a signal processing unit 150.
  • Various settings for the outdoor radio 140 including the transmission speed desired by the user 200 are input to the user setting input unit 158.
  • the user setting input unit 158 sets the input transmission speed desired by the user 200 with respect to the signal processing unit 150.
  • the transmission speed desired by the user 200 may be acquired from the relay radio 110 by wireless communication, and the acquired transmission speed may be set for the signal processing unit 150.
  • the signal processing unit 150 may be, for example, a general-purpose processing device, a DSP, or an FPGA.
  • the signal processing unit 150 can execute any processing that enables the outdoor radio 140 to perform wireless communication, such as signal coding / decoding, input / output processing, and data processing.
  • the signal processing unit 150 is drawn as a component separate from the radio wave transmitting unit 162 and the radio wave receiving unit 164.
  • the signal processing unit 150, the radio wave transmitting unit 162, and the radio wave receiving unit 164 may be integrated into one electronic component.
  • the signal processing unit 150 operates software that changes the frequency band and communication method used for communication with the relay radio 110. By the operation of this software, the signal processing unit 150 functions as a frequency band search unit 152, a communication method selection unit 154, and further functions as a frequency band width calculation unit 156.
  • the frequency band search unit 152 is connected to the radio wave reception unit 164
  • the communication method selection unit 154 is connected to the radio wave transmission unit 162
  • the frequency band width calculation unit 156 is connected to the user setting input unit 158.
  • the frequency band search unit 152 searches for a frequency band that can provide good communication quality in cooperation with the relay radio 110 in communication with the relay radio 110.
  • the frequency band search unit 152 searches for a frequency band in which the influence of interference and noise from others is small in both the relay radio 110 and the outdoor radio 140 in a state of not communicating with the relay radio 110 by carrier sense. do.
  • the frequency band search unit 152 has a frequency band in which the reception level is relatively high and the C / N is equal to or higher than the threshold value in both the relay radio 110 and the outdoor radio 140. Is searched in cooperation with the relay radio 110.
  • the signal processing unit 150 controls the radio wave transmitting unit 162 and the radio wave receiving unit 164 so as to communicate with the relay radio 110 using the frequency band searched by the frequency band searching unit 152.
  • the transmission speed desired by the user 200 is input from the user setting input unit 158 to the frequency bandwidth calculation unit 156.
  • the frequency bandwidth calculation unit 156 calculates a target frequency bandwidth for realizing the transmission speed desired by the user 200.
  • the frequency band width calculation unit 156 bundles a plurality of frequency bands and performs carrier aggregation. ..
  • the communication method selection unit 154 saves time when communication with the relay radio 110 is started using the frequency band searched by the frequency band search unit 152 or the frequency band bundled by the frequency bandwidth calculation unit 156. Select a communication method that can communicate with power.
  • the communication method selection unit 154 controls the radio wave transmission unit 162 and the radio wave reception unit 164 so that communication is performed by the selected communication method.
  • FIG. 9 is a flowchart for explaining the contents of the process executed between the outdoor radio unit 140 and the relay radio unit 110 in the wireless relay system 102.
  • the frequency band to be used is determined between the two.
  • FIG. 9 shows a procedure for searching for a frequency band used for outdoor communication and starting communication in the searched frequency band.
  • the relay radio 110 accepts the designation of the transmission speed from the user 200 with the outdoor radio 140 (step S100).
  • the outdoor radio 140 also accepts the designation of the transmission speed with the relay radio 110 from the user 200 (step S120).
  • the transmission speed specified for the relay radio 110 and the transmission speed specified for the outdoor radio 140 need to match. Therefore, when the transmission speed is input to either the relay radio 110 or the outdoor radio 140, the transmission speed is notified to the other radio using a predetermined frequency band. May be good.
  • the relay radio 110 searches for the frequency band G1 in which interference and noise are equal to or less than the threshold value by carrier sense (step S102).
  • the outdoor radio 140 also searches for the frequency band G2 in which interference and noise are below the threshold value by carrier sense (step S122).
  • the relay radio 110 and the outdoor radio 140 select a reception mode in a state where they are not communicating, and measure the reception power in each frequency band that can be used by each.
  • the relay radio 110 compares the received power with the threshold value for each frequency band, and searches for the frequency band G1 in which the received power is equal to or less than the threshold value.
  • the outdoor radio 140 also compares the received power with the threshold value for each frequency band, and searches for the frequency band G2 in which the received power is equal to or less than the threshold value.
  • the threshold value used in step S102 and the threshold value used in step S122 do not necessarily have to be the same value.
  • the relay radio 110 transmits radio waves to the outdoor radio 140 in the frequency band G where the frequency band G1 and the frequency band G2 overlap (step S104).
  • the outdoor radio 140 also transmits radio waves to the relay radio 110 in the frequency band G (step S124).
  • the frequency band G is a frequency band that can be determined not to be used in other radios when viewed from both the relay radio 110 and the outdoor radio 140.
  • the frequency band G corresponds to the first common frequency band searched by the software defined radio for radio relay according to the second aspect of the present disclosure.
  • the relay radio 110 receives radio waves from the outdoor radio 140, and searches for a frequency band H1 in which the reception level of the received radio waves is relatively high and the C / N of the radio waves is equal to or higher than the threshold value (step S106). ).
  • the outdoor radio 140 also receives radio waves from the relay radio 110, and searches for a frequency band H2 in which the reception level of the received radio waves is relatively high and the C / N of the radio waves is equal to or higher than the threshold value (step). S126).
  • the threshold value used in step S106 and the threshold value used in step S126 do not necessarily have to be the same value.
  • the relay radio 110 transmits radio waves to the outdoor radio 140 in the frequency band H where the frequency band H1 and the frequency band H2 overlap (step S108).
  • the outdoor radio 140 also transmits radio waves to the relay radio 110 in the frequency band H (step S128).
  • the frequency band H is a frequency band in which the reception level of radio waves is relatively high and the C / N of radio waves is equal to or higher than the threshold value in both the relay radio 110 and the outdoor radio 140, that is, good. It is a frequency band that can provide communication quality.
  • the frequency band H corresponds to the second common frequency band searched for by the software defined radio for wireless relay according to the second aspect of the present disclosure, and is also the frequency band for outdoor communication in the wireless relay system and the wireless relay method of the present disclosure. Corresponds to.
  • the outdoor radio 140 and the relay radio 110 start communication in the frequency band H.
  • the relay radio 110 and the outdoor radio 140 perform carrier aggregation (steps S110 and S130). Specifically, when there are a plurality of frequency bands that can be used as the frequency band H, the relay radio 110 and the outdoor radio 140 are used by bundling the plurality of frequency bands. However, the frequency band for carrier aggregation needs to match between the relay radio 110 and the outdoor radio 140. Therefore, the frequency band to be carrier-aggregated is determined for either the relay radio 110 or the outdoor radio 140, and the target frequency band is notified to the other radio using a predetermined frequency band. You may do it.
  • FIG. 10 is a flowchart for explaining the contents of the process executed between the indoor radio unit 170 and the relay radio unit 110 in the wireless relay system 102.
  • the frequency band to be used is determined between the two.
  • the frequency band to be used is determined for each indoor radio 170 according to the procedure shown in FIG. FIG. 10 shows a procedure for searching for a frequency band used for indoor communication and starting communication in the searched frequency band.
  • the relay radio 110 accepts the designation of the transmission speed from the user 200 with the indoor radio 170 (step S140).
  • the indoor radio 170 also accepts the designation of the transmission speed with the relay radio 110 from the user 200 (step S160). However, when the transmission speed is input to either the relay radio 110 or the indoor radio 170, the transmission speed is notified to the other radio using a predetermined frequency band. May be good.
  • the relay radio 110 searches for the frequency band J1 in which interference and noise are equal to or less than the threshold value by carrier sense (step S142).
  • the indoor radio 170 also searches for the frequency band J2 in which interference and noise are below the threshold value by carrier sense (step S162).
  • the relay radio 110 and the indoor radio 170 select a reception mode in a state where they are not communicating, and measure the reception power in each frequency band that can be used by each.
  • the relay radio 110 compares the received power with the threshold value for each frequency band, and searches for the frequency band J1 in which the received power is equal to or less than the threshold value.
  • the indoor radio 170 also compares the received power with the threshold value for each frequency band, and searches for the frequency band J2 in which the received power is equal to or less than the threshold value.
  • the threshold value used in step S142 and the threshold value used in step S162 do not necessarily have to be the same value.
  • the relay radio 110 transmits radio waves to the indoor radio 170 in the frequency band J where the frequency band J1 and the frequency band J2 overlap (step S144).
  • the indoor radio 170 also transmits radio waves to the relay radio 110 in the frequency band J (step S164).
  • the frequency band J corresponds to the third common frequency band searched by the software defined radio for radio relay according to the second aspect of the present disclosure.
  • the relay radio 110 receives the radio wave from the indoor radio 170, and searches for a frequency band K1 in which the reception level of the received radio wave is relatively high and the C / N of the radio wave is equal to or higher than the threshold value (step S146). ).
  • the indoor radio 170 also receives radio waves from the relay radio 110, and searches for a frequency band K2 in which the reception level of the received radio waves is relatively high and the C / N of the radio waves is equal to or higher than the threshold value (step). S166).
  • the threshold value used in step S146 and the threshold value used in step S166 do not necessarily have to be the same value.
  • the relay radio 110 transmits radio waves to the indoor radio 170 in the frequency band K where the frequency band K1 and the frequency band K2 overlap (step S148).
  • the indoor radio 170 also transmits radio waves to the relay radio 110 in the frequency band K (step S168).
  • the frequency band K is a frequency band in which the reception level of radio waves is relatively high in both the relay radio 110 and the indoor radio 170 and the C / N of the radio waves is equal to or higher than the threshold value, that is, good. It is a frequency band that can provide communication quality.
  • the frequency band K corresponds to the fourth common frequency band searched for by the software defined radio for wireless relay according to the second aspect of the present disclosure, and is also the frequency band for indoor communication in the wireless relay system and the wireless relay method of the present disclosure. Corresponds to.
  • the indoor radio 170 and the relay radio 110 start communication in the frequency band K.
  • the relay radio 110 and the indoor radio 170 perform carrier aggregation (steps S150 and S170). Specifically, when there are a plurality of frequency bands that can be used as the frequency band K, the relay radio 110 and the indoor radio 170 are used by bundling the plurality of frequency bands. However, the frequency band to be carrier-aggregated is determined for either the relay radio 110 or the indoor radio 170, and the target frequency band is notified to the other radio using a predetermined frequency band. You may do it.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Relay Systems (AREA)

Abstract

A radio relay system according to the present disclosure comprises an outdoor radio machine, an indoor radio machine, and a relay radio machine which relays the outdoor radio machine and the indoor radio machine, wherein the at least relay radio machine is composed as a software radio machine. The radio relay system searches for a frequency band in which interference and noise detected in a state where communication is not performed with a communication partner are equal to or less than a threshold in each of radio communication between the relay radio machine and the outdoor radio machine, and radio communication between the relay radio machine and the indoor radio machine. The radio relay system further searches, from the searched frequency band, for a frequency band in which a C/N ratio of a radio wave received from the communication partner is equal to or greater than a threshold, and performs radio communication by using a finally found frequency band.

Description

無線中継システム、無線中継方法、無線中継用ソフトウェア無線機、および無線中継用プログラムWireless relay system, wireless relay method, software defined radio for wireless relay, and program for wireless relay
 この開示は、無線中継システム、無線中継方法、無線中継用ソフトウェア無線機、および無線中継用プログラムに係り、特に、屋外無線機と屋内無線機とを中継する無線中継システム、無線中継方法、無線中継用ソフトウェア無線機、および無線中継用プログラムに関する。 This disclosure relates to a radio relay system, a radio relay method, a software defined radio for radio relay, and a program for radio relay, and in particular, a radio relay system for relaying an outdoor radio and an indoor radio, a radio relay method, and a radio relay. Software defined radio and wireless relay programs.
 特許文献1には、無線データ通信システムが開示されている。この無線データ通信システムでは、任意の端末装置に作業者がアクセスして他の端末装置固有の新たな通信経路データを入力すると、その端末装置から当該他の端末装置に対して当該固有の通信経路データが専用の通信経路データ伝送コマンドとして送信される。当該他の端末装置はそのとき受信した通信経路データを記憶手段に格納することで、自らの通信経路データの設定、更新を行い、以後その通信経路データに従って通信を行う。この無線データ通信システムによれば、作業者がわざわざ各端末装置の設置箇所に移動して通信経路データの設定、更新作業を行わずとも、任意の端末装置からの通信により各端末装置の通信経路データが設定、更新される。 Patent Document 1 discloses a wireless data communication system. In this wireless data communication system, when a worker accesses an arbitrary terminal device and inputs new communication path data peculiar to another terminal device, the terminal device has a unique communication path to the other terminal device. The data is transmitted as a dedicated communication path data transmission command. The other terminal device stores the communication path data received at that time in the storage means, sets and updates its own communication path data, and thereafter performs communication according to the communication path data. According to this wireless data communication system, the communication path of each terminal device can be communicated from any terminal device without the need for an operator to move to the installation location of each terminal device to set or update the communication path data. Data is set and updated.
日本特開平04-321340号公報Japanese Patent Application Laid-Open No. 04-321340
 特許文献1に記載の従来技術によれば、中継に関するデータ設定を簡易に行うことができるので、無線機を設置する作業者の負担が軽減される。しかし、無線機で使用される周波数帯は、例えば、干渉や雑音による影響や、見通し外の無線機への通信における回折損失による影響等、通信環境による影響をうける。特に屋外と屋内とを中継する場合は、壁やガラスの透過損失による影響も受けることになる。このため、特許文献1に記載の従来技術では、データ設定の後に必ずしも良好な通信品質が確保されるとは言えない。 According to the conventional technique described in Patent Document 1, data setting related to relay can be easily performed, so that the burden on the operator who installs the radio is reduced. However, the frequency band used in the radio is affected by the communication environment, for example, the influence of interference and noise, and the influence of diffraction loss in communication to the radio in line of sight. Especially when relaying between outdoors and indoors, it will be affected by the transmission loss of walls and glass. Therefore, in the conventional technique described in Patent Document 1, it cannot be said that good communication quality is always ensured after data setting.
 本開示は、上記事情に着目してなされたもので、通信環境による影響を低減して良好な通信品質を無線中継において実現する技術を提供することを目的とする。 The present disclosure has been made by paying attention to the above circumstances, and an object of the present invention is to provide a technology for reducing the influence of the communication environment and realizing good communication quality in wireless relay.
 本開示は、上記目的を達成するため、屋外無線機と屋内無線機とそれらを中継する中継無線機とを備える無線中継システムを提供する。本無線中継システムにおいて、中継無線機はソフトウェア無線機として構成され、屋外無線機と屋内無線機とは複数の周波数帯の中から使用する周波数帯を選択可能に構成される。 The present disclosure provides a radio relay system including an outdoor radio, an indoor radio, and a relay radio that relays them in order to achieve the above object. In this radio relay system, the relay radio is configured as a software defined radio, and the outdoor radio and the indoor radio are configured so that the frequency band to be used can be selected from a plurality of frequency bands.
 中継無線機と屋外無線機とは、協働により、屋外通信準備処理と屋外通信開始処理とを実行する。屋外通信準備処理では、中継無線機と屋外無線機とが通信していない状態で検知される干渉及び雑音が閾値以下であり、中継無線機と屋外無線機との少なくとも一方で受信される通信相手からの電波の受信レベルが相対的に高く、且つ当該電波のC/Nが閾値以上になる屋外通信用周波数帯が探索される。屋外通信開始処理では、屋外通信準備処理で探索された屋外通信用周波数帯を用いて中継無線機と屋外無線機との通信が開始される。本開示では、屋外通信とは屋外無線機と中継無線機との間の無線通信と定義される。 The relay radio and the outdoor radio collaborate to execute the outdoor communication preparation process and the outdoor communication start process. In the outdoor communication preparation process, the interference and noise detected when the relay radio and the outdoor radio are not communicating are below the threshold value, and the communication partner received by at least one of the relay radio and the outdoor radio. An outdoor communication frequency band in which the reception level of the radio wave from the radio wave is relatively high and the C / N of the radio wave is equal to or higher than the threshold value is searched for. In the outdoor communication start process, communication between the relay radio and the outdoor radio is started using the frequency band for outdoor communication searched in the outdoor communication preparation process. In the present disclosure, outdoor communication is defined as wireless communication between an outdoor radio and a relay radio.
 中継無線機と屋内無線機とは、協働により、屋内通信準備処理と屋内通信開始処理とを実行する。屋内通信準備処理では、中継無線機と屋内無線機とが通信していない状態で検知される干渉及び雑音が閾値以下であり、中継無線機と屋内無線機との少なくとも一方で受信される通信相手からの電波の受信レベルが相対的に高く、且つ当該電波のC/Nが閾値以上になる屋内通信用周波数帯が探索される。屋内通信開始処理では、屋内通信準備処理で探索された屋内通信用周波数帯を用いて中継無線機と屋内無線機との通信が開始される。本開示では、屋内通信とは屋内無線機と中継無線機との間の無線通信と定義される。 The relay radio and the indoor radio collaborate to execute the indoor communication preparation process and the indoor communication start process. In the indoor communication preparation process, the interference and noise detected when the relay radio and the indoor radio are not communicating are below the threshold value, and the communication partner received by at least one of the relay radio and the indoor radio. An indoor communication frequency band in which the reception level of the radio wave from the radio wave is relatively high and the C / N of the radio wave is equal to or higher than the threshold value is searched for. In the indoor communication start process, communication between the relay radio and the indoor radio is started using the frequency band for indoor communication searched in the indoor communication preparation process. In the present disclosure, indoor communication is defined as wireless communication between an indoor radio and a relay radio.
 また、本開示は、上記目的を達成するため、屋外無線機と屋内無線機とを中継無線機によって中継する無線中継方法を提供する。本無線中継方法において、中継無線機はソフトウェア無線機であり、屋外無線機と屋内無線機とは複数の周波数帯の中から使用する周波数帯を選択可能である。本無線中継方法は、中継無線機と屋外無線機との間で通信を行う屋外通信ステップと、中継無線機と屋内無線機との間で通信を行う屋内通信ステップとを含む。 Further, in order to achieve the above object, the present disclosure provides a radio relay method in which an outdoor radio and an indoor radio are relayed by a relay radio. In this wireless relay method, the relay radio is a software defined radio, and the outdoor radio and the indoor radio can select a frequency band to be used from a plurality of frequency bands. The wireless relay method includes an outdoor communication step in which communication is performed between the relay radio and the outdoor radio, and an indoor communication step in which communication is performed between the relay radio and the indoor radio.
 屋外通信ステップは、屋外通信準備ステップと屋外通信開始ステップとを含む。屋外通信準備ステップでは、中継無線機と屋外無線機とが通信していない状態で検知される干渉及び雑音が閾値以下であり、中継無線機と屋外無線機との少なくとも一方で受信される通信相手からの電波の受信レベルが相対的に高く、且つ当該電波のC/Nが閾値以上になる屋外通信用周波数帯が探索される。屋外通信開始ステップでは、探索された屋外通信用周波数帯を用いて中継無線機と屋外無線機との間で通信が開始される。 The outdoor communication step includes an outdoor communication preparation step and an outdoor communication start step. In the outdoor communication preparation step, the interference and noise detected when the relay radio and the outdoor radio are not communicating are below the threshold value, and the communication partner received by at least one of the relay radio and the outdoor radio. An outdoor communication frequency band in which the reception level of the radio wave from the radio wave is relatively high and the C / N of the radio wave is equal to or higher than the threshold value is searched for. In the outdoor communication start step, communication is started between the relay radio and the outdoor radio using the searched frequency band for outdoor communication.
 屋内通信ステップは、屋内通信準備ステップと屋内通信開始ステップとを含む。屋内通信準備ステップでは、中継無線機と屋内無線機とが通信していない状態で検知される干渉及び雑音が閾値以下であり、中継無線機と屋内無線機との少なくとも一方で受信される通信相手からの電波の受信レベルが相対的に高く、且つ当該電波のC/Nが閾値以上になる屋内通信用周波数帯が探索される。屋内通信開始ステップでは、探索された屋内通信用周波数帯を用いて中継無線機と屋内無線機との間で通信が開始される。 The indoor communication step includes an indoor communication preparation step and an indoor communication start step. In the indoor communication preparation step, the interference and noise detected when the relay radio and the indoor radio are not communicating are below the threshold value, and the communication partner received by at least one of the relay radio and the indoor radio. An indoor communication frequency band in which the reception level of the radio wave from the radio wave is relatively high and the C / N of the radio wave is equal to or higher than the threshold value is searched for. In the indoor communication start step, communication is started between the relay radio and the indoor radio using the searched frequency band for indoor communication.
 また、本開示は、上記目的を達成するため、第1の態様の無線中継用ソフトウェア無線機と第2の態様の無線中継用ソフトウェア無線機とを提供する。 Further, in order to achieve the above object, the present disclosure provides a software defined radio for wireless relay according to the first aspect and a software defined radio for wireless relay according to the second aspect.
 第1の態様の無線中継用ソフトウェア無線機は、複数の周波数帯の中から使用する周波数帯を選択可能に構成された屋外無線機及び屋内無線機を中継するソフトウェア無線機である。本無線中継用ソフトウェア無線機は、屋外無線機と通信する屋外通信用送受信部と、屋内無線機と通信する屋内通信用送受信部と、屋外通信用送受信部と屋内通信用送受信部とに接続された信号処理部とを備える。信号処理部では、屋外無線機との通信に使用する周波数帯の変更と屋内無線機との通信に使用する周波数帯の変更とを行うソフトウェアが動作する。 The software defined radio for radio relay of the first aspect is a software defined radio that relays an outdoor radio and an indoor radio configured so that the frequency band to be used can be selected from a plurality of frequency bands. The software defined radio for wireless relay is connected to an outdoor communication transceiver that communicates with an outdoor radio, an indoor communication transceiver that communicates with an indoor radio, and an outdoor communication transceiver and an indoor communication transceiver. It also has a signal processing unit. In the signal processing unit, software that changes the frequency band used for communication with the outdoor radio and the frequency band used for communication with the indoor radio operates.
 信号処理部は、屋外無線機との通信において、第1周波数帯探索処理、第2周波数帯探索処理、及び、屋外通信開始処理を実行する。第1周波数帯探索処理では、屋外無線機と通信していない状態において検知される干渉及び雑音が閾値以下になる第1周波数帯がキャリアセンスにより探索される。第2周波数帯探索処理では、屋外無線機から送信される電波に基づき、受信レベルが相対的に高く且つC/Nが閾値以上になる第2周波数帯が探索される。そして、屋外通信開始処理では、第1周波数帯と第2周波数帯とが重なる周波数帯を用いて屋外無線機と通信するように屋外通信用送受信部が制御される。 The signal processing unit executes the first frequency band search process, the second frequency band search process, and the outdoor communication start process in the communication with the outdoor radio. In the first frequency band search process, the carrier sense searches for the first frequency band in which the interference and noise detected in the state of not communicating with the outdoor radio are equal to or less than the threshold value. In the second frequency band search process, a second frequency band having a relatively high reception level and a C / N equal to or higher than the threshold value is searched for based on the radio waves transmitted from the outdoor radio. Then, in the outdoor communication start processing, the outdoor communication transmission / reception unit is controlled so as to communicate with the outdoor radio using the frequency band in which the first frequency band and the second frequency band overlap.
 信号処理部は、屋内無線機との通信において、第3周波数帯探索処理、第4周波数帯探索処理、及び、屋内通信開始処理を実行する。第3周波数帯探索処理では、屋外無線機と通信していない状態において検知される干渉及び雑音が閾値以下になる第3周波数帯がキャリアセンスにより探索される。第4周波数帯探索処理では、屋内無線機から送信される電波に基づき、受信レベルが相対的に高く且つC/Nが閾値以上になる第4周波数帯が探索される。そして、屋内通信開始処理では、第3周波数帯と第4周波数帯とが重なる周波数帯を用いて屋内無線機と通信するように屋内通信用送受信部が制御される。 The signal processing unit executes the third frequency band search process, the fourth frequency band search process, and the indoor communication start process in the communication with the indoor radio. In the third frequency band search process, the third frequency band in which the interference and noise detected in the state of not communicating with the outdoor radio are equal to or less than the threshold value is searched by carrier sense. In the fourth frequency band search process, a fourth frequency band whose reception level is relatively high and whose C / N is equal to or higher than the threshold value is searched based on the radio waves transmitted from the indoor radio. Then, in the indoor communication start processing, the indoor communication transmission / reception unit is controlled so as to communicate with the indoor radio using the frequency band in which the third frequency band and the fourth frequency band overlap.
 第2の態様の無線中継用ソフトウェア無線機は、ソフトウェア無線を利用する屋外無線機及び屋内無線機を中継するソフトウェア無線機である。本無線中継用ソフトウェア無線機は、屋外無線機と通信する屋外通信用送受信部と、屋内無線機と通信する屋内通信用送受信部と、屋外通信用送受信部と屋内通信用送受信部とに接続された信号処理部とを備える。信号処理部では、屋外無線機との通信に使用する周波数帯の変更と屋内無線機との通信に使用する周波数帯の変更とを行うソフトウェアが動作する。 The software defined radio for wireless relay of the second aspect is a software defined radio that relays an outdoor radio and an indoor radio that use the software defined radio. The software defined radio for wireless relay is connected to an outdoor communication transceiver that communicates with an outdoor radio, an indoor communication transceiver that communicates with an indoor radio, and an outdoor communication transceiver and an indoor communication transceiver. It also has a signal processing unit. In the signal processing unit, software that changes the frequency band used for communication with the outdoor radio and the frequency band used for communication with the indoor radio operates.
 信号処理部は、屋外無線機との通信において、第1共通周波数帯探索処理、第2共通周波数帯探索処理、及び、屋外通信開始処理を実行する。第1共通周波数帯探索処理では、屋外無線機と通信していない状態において、無線中継用ソフトウェア無線機と屋外無線機の双方において検知される干渉及び雑音のレベルが閾値以下になる第1共通周波数帯が屋外無線機と協働してキャリアセンスにより探索される。第2共通周波数帯探索処理では、探索された第1共通周波数帯のうち、無線中継用ソフトウェア無線機と屋外無線機の双方において受信レベルが相対的に高く且つC/Nが閾値以上になる第2共通周波数帯が屋外無線機との協働により探索される。そして、屋外通信開始処理では、探索された第2共通周波数帯を用いて屋外無線機と通信するように屋外通信用送受信部が制御される。 The signal processing unit executes the first common frequency band search process, the second common frequency band search process, and the outdoor communication start process in the communication with the outdoor radio. In the first common frequency band search process, the first common frequency at which the level of interference and noise detected by both the software defined radio for wireless relay and the outdoor radio is below the threshold when not communicating with the outdoor radio. The band is searched by carrier sense in cooperation with the outdoor radio. In the second common frequency band search process, among the searched first common frequency bands, the reception level is relatively high in both the wireless relay software defined radio and the outdoor radio, and the C / N becomes equal to or higher than the threshold value. 2 A common frequency band is searched for in collaboration with an outdoor radio. Then, in the outdoor communication start processing, the outdoor communication transmission / reception unit is controlled so as to communicate with the outdoor radio using the searched second common frequency band.
 信号処理部は、屋内無線機との通信において、第3共通周波数帯探索処理、第4共通周波数帯探索処理、及び、屋内通信開始処理を実行する。第3共通周波数帯探索処理では、屋内無線機と通信していない状態において、無線中継用ソフトウェア無線機と屋内無線機の双方において検知される干渉及び雑音のレベルが閾値以下になる第3共通周波数帯が屋内無線機と協働してキャリアセンスにより探索される。第4共通周波数帯探索処理では、探索された第3共通周波数帯のうち、無線中継用ソフトウェア無線機と屋内無線機の双方において受信レベルが相対的に高く且つC/Nが閾値以上になる第4共通周波数帯が屋内無線機との協働により探索される。そして、屋内通信開始処理では、探索された第4共通周波数帯を用いて屋内無線機と通信するように屋内通信用送受信部が制御される。 The signal processing unit executes the third common frequency band search process, the fourth common frequency band search process, and the indoor communication start process in the communication with the indoor radio. In the third common frequency band search process, the level of interference and noise detected by both the software defined radio for wireless relay and the indoor radio is equal to or less than the threshold value in the state of not communicating with the indoor radio. The band is searched by carrier sense in cooperation with the indoor radio. In the fourth common frequency band search process, among the searched third common frequency bands, the reception level is relatively high in both the wireless relay software defined radio and the indoor radio, and the C / N becomes equal to or higher than the threshold value. 4 Common frequency bands are searched for in collaboration with indoor radios. Then, in the indoor communication start processing, the indoor communication transmission / reception unit is controlled so as to communicate with the indoor radio using the searched fourth common frequency band.
 また、本開示は、上記目的を達成するため、無線中継用プログラムを提供する。本無線中継用プログラムは、コンピュータに、上記第1の態様の無線中継用ソフトウェア無線機の機能、或いは、上記第2の態様の無線中継用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。 In addition, the present disclosure provides a program for wireless relay in order to achieve the above object. The present wireless relay program includes a program for realizing the function of the wireless relay software defined radio of the first aspect or the function of the wireless relay software defined radio of the second aspect to the computer.
 上記のとおり、本開示によれば、ソフトウェア無線機を活用し、通信環境による影響を低減して良好な通信品質を無線中継において実現する技術を提供することができる。 As described above, according to the present disclosure, it is possible to provide a technique for utilizing a software defined radio to reduce the influence of the communication environment and realize good communication quality in wireless relay.
本開示の第1実施形態に係る無線中継システムの概要を説明するための図である。It is a figure for demonstrating the outline of the wireless relay system which concerns on 1st Embodiment of this disclosure. ガラスの透過係数と入射角と周波数帯との関係を示す図である。It is a figure which shows the relationship between the transmission coefficient of a glass, an incident angle, and a frequency band. 図1に示す中継無線機の機能を説明するためのブロック図である。It is a block diagram for demonstrating the function of the relay radio shown in FIG. 図1に示す無線中継システムにおいて屋外無線機と中継無線機との間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 between the outdoor radio and the relay radio in the wireless relay system shown in FIG. 1. 図1に示す無線中継システムにおいて屋内無線機と中継無線機との間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 between an indoor radio and a relay radio in the wireless relay system shown in FIG. 1. 本開示の第2実施形態に係る無線中継システムの概要を説明するための図である。It is a figure for demonstrating the outline of the wireless relay system which concerns on 2nd Embodiment of this disclosure. 図6に示す中継無線機の機能を説明するためのブロック図である。It is a block diagram for demonstrating the function of the relay radio shown in FIG. 図6に示す屋外無線機及び屋内無線機の機能を説明するためのブロック図である。It is a block diagram for demonstrating the function of the outdoor radio and the indoor radio shown in FIG. 図6に示す無線中継システムにおいて屋外無線機と中継無線機との間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 between the outdoor radio and the relay radio in the wireless relay system shown in FIG. 図6に示す無線中継システムにおいて屋内無線機と中継無線機との間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 between an indoor radio and a relay radio in the wireless relay system shown in FIG.
 以下、図面を参照して本開示の実施形態について説明する。 Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.
1.第1実施形態
1-1.概要
 図1は、本開示の第1実施形態に係る無線中継システムの概要を説明するための図である。本無線中継システム2は、屋外に設置された屋外無線機4と、屋内に設置された屋内無線機6との無線通信を中継するシステムである。屋内と屋外との間には、家屋の壁や窓などの物理的な境界面8が存在する。本無線中継システム2は、家屋の境界面8に中継無線機10を備える。中継無線機10は、1台の屋外無線機4と1台の屋内無線機6とを中継するだけでなく、1台の屋外無線機4と複数台の屋内無線機6とを中継することができる。中継無線機10は、屋内と屋外のどちらにも設置することができる。中継無線機10は、境界面8に貼り付けてもよいし、境界面8のそばに設置してもよい。本実施形態では、中継無線機10は、境界面8の屋内側に貼り付けられているものとする。
1. 1. First Embodiment 1-1. Overview FIG. 1 is a diagram for explaining an outline of a wireless relay system according to the first embodiment of the present disclosure. The wireless relay system 2 is a system that relays wireless communication between an outdoor radio 4 installed outdoors and an indoor radio 6 installed indoors. Between indoors and outdoors, there is a physical boundary surface 8 such as a wall or a window of a house. The wireless relay system 2 includes a relay radio 10 on the boundary surface 8 of the house. The relay radio 10 can not only relay one outdoor radio 4 and one indoor radio 6, but also relay one outdoor radio 4 and a plurality of indoor radios 6. can. The relay radio 10 can be installed both indoors and outdoors. The relay radio 10 may be attached to the boundary surface 8 or may be installed near the boundary surface 8. In the present embodiment, it is assumed that the relay radio 10 is attached to the indoor side of the boundary surface 8.
 屋内と屋外との間での無線通信においては、家屋の境界面8を通過する際の透過損失によって電波が減衰する。透過損失は、境界面8の材質などにより異なるだけでなく、電波の入射角や周波数によっても異なる。図2は、家屋の境界面8の材料として一般的なガラスにおける透過係数と入射角と周波数帯との関係を示す図である。実線は入射角がゼロの場合の透過係数と周波数帯との関係を示し、点線、一点鎖線、及び破線は入射角がゼロより大きい場合の透過係数と周波数帯との関係を示す。図2に示すように、入射角が大きいほど透過係数は小さくなる。すなわち、入射角が大きいほど透過損失は大きくなる。また、透過係数は周波数に対して正弦曲線を描いて変化する。ただし、透過係数と周波数帯との関係、透過係数と入射角との関係は材質によって異なったものとなる。図2に示すような特性により、中継無線機10を屋内に設置する場合には、屋外無線機4との距離が最も近い場所を設置場所とすることで境界面8での電波の減衰を抑えることができる。中継無線機10の設置場所が決まれば、透過損失は周波数に依存するようになる。ゆえに、無線通信に使用する周波数帯を適宜選択することによって、壁や窓を挟む通信環境であっても良好な通信品質を実現することが可能となる。 In wireless communication between indoors and outdoors, radio waves are attenuated due to transmission loss when passing through the boundary surface 8 of a house. The transmission loss differs not only depending on the material of the boundary surface 8 and the like, but also on the incident angle and frequency of the radio wave. FIG. 2 is a diagram showing the relationship between the transmission coefficient, the incident angle, and the frequency band in glass, which is generally used as a material for the boundary surface 8 of a house. The solid line shows the relationship between the transmission coefficient and the frequency band when the incident angle is zero, and the dotted line, the alternate long and short dash line, and the broken line show the relationship between the transmission coefficient and the frequency band when the incident angle is larger than zero. As shown in FIG. 2, the larger the incident angle, the smaller the transmission coefficient. That is, the larger the incident angle, the larger the transmission loss. In addition, the transmission coefficient changes by drawing a sinusoidal curve with respect to the frequency. However, the relationship between the transmission coefficient and the frequency band and the relationship between the transmission coefficient and the incident angle differ depending on the material. Due to the characteristics shown in FIG. 2, when the relay radio 10 is installed indoors, the place where the distance from the outdoor radio 4 is closest is set as the installation place, so that the attenuation of the radio wave at the boundary surface 8 is suppressed. be able to. Once the installation location of the relay radio 10 is decided, the transmission loss depends on the frequency. Therefore, by appropriately selecting the frequency band used for wireless communication, it is possible to realize good communication quality even in a communication environment sandwiching a wall or a window.
 本無線中継システム2では、周波数帯を適宜に選択する手段としてソフトウェア無線機が用いられている。ソフトウェア無線機は、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や通信方式を変更することができる。本無線中継システム2では、中継無線機10がソフトウェア無線機として構成されている。ソフトウェア無線機である中継無線機10は、屋外無線機4との間で通信に用いる周波数帯を決定し、決定した周波数帯にて通信を開始する機能を有する。中継無線機10は、それぞれの屋内無線機6に対して、その設置位置での通信条件、例えば、見通し通信や見通し外通信を判定する機能を有する。さらに、中継無線機10は、それぞれの屋内無線機6との間で通信に用いる周波数帯を通信条件に応じて屋内無線機6ごとに決定し、決定した周波数帯にて通信を開始する機能を有する。 In this wireless relay system 2, a software defined radio is used as a means for appropriately selecting a frequency band. The software defined radio 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. In the wireless relay system 2, the relay radio 10 is configured as a software defined radio. The relay radio 10 which is a software defined radio has a function of determining a frequency band to be used for communication with the outdoor radio 4 and starting communication in the determined frequency band. The relay radio 10 has a function for determining the communication conditions at the installation position of each indoor radio 6, for example, line-of-sight communication and non-line-of-sight communication. Further, the relay radio 10 has a function of determining a frequency band used for communication with each indoor radio 6 for each indoor radio 6 according to communication conditions and starting communication in the determined frequency band. Have.
 屋外無線機4及び屋内無線機6は、複数の周波数帯の中から中継無線機10との無線通信に要する周波数帯を選択可能に構成されている。ただし、本無線中継システム2では、屋外無線機4及び屋内無線機6は、必ずしもソフトウェア無線機である必要はない。例えば、屋外無線機4及び屋内無線機6は、通信に用いる周波数帯が異なる複数のハードウェアを備え、ハードウェアを変更することによって周波数帯を選択するように構成されている。 The outdoor radio 4 and the indoor radio 6 are configured so that the frequency band required for wireless communication with the relay radio 10 can be selected from a plurality of frequency bands. However, in the present wireless relay system 2, the outdoor radio 4 and the indoor radio 6 do not necessarily have to be software defined radios. For example, the outdoor radio 4 and the indoor radio 6 include a plurality of hardware having different frequency bands used for communication, and are configured to select the frequency band by changing the hardware.
 本無線中継システム2では、中継無線機10と屋外無線機4との協働により、また、中継無線機10と屋内無線機6との協働により、家屋の境界面8での透過損失が少なく、良好な通信品質が得られる周波数帯が探索される。中継無線機10と屋外無線機4との通信においては、屋外無線機4が選択可能な周波数帯のうち、他の無線機からの干渉及び雑音の影響が少なく、中継無線機10で受信される屋外無線機4からの電波の受信レベルが相対的に高く、且つ当該電波のC/Nが高い広帯域な周波数帯が探索される。中継無線機10と屋内無線機6との通信においては、屋内無線機6が選択可能な周波数帯のうち、他の無線機からの干渉及び雑音の影響が少なく、中継無線機10で受信される屋内無線機6からの電波の受信レベルが相対的に高く、且つ当該電波のC/Nが高い広帯域な周波数帯が屋内無線機6毎に探索される。周波数帯の探索に係る中継無線機10の機能については次章以降において詳細に説明する。 In this wireless relay system 2, the transmission loss at the boundary surface 8 of the house is small due to the cooperation between the relay radio 10 and the outdoor radio 4 and the cooperation between the relay radio 10 and the indoor radio 6. , A frequency band where good communication quality can be obtained is searched. In the communication between the relay radio 10 and the outdoor radio 4, the influence of interference and noise from other radios is small among the frequency bands that can be selected by the outdoor radio 4, and the relay radio 10 receives the radio waves. A wide band frequency band in which the reception level of the radio wave from the outdoor radio 4 is relatively high and the C / N of the radio wave is high is searched for. In the communication between the relay radio 10 and the indoor radio 6, the influence of interference and noise from other radios is small among the frequency bands that can be selected by the indoor radio 6, and the reception is received by the relay radio 10. A wide band frequency band in which the reception level of the radio wave from the indoor radio 6 is relatively high and the C / N of the radio wave is high is searched for for each indoor radio 6. The functions of the relay radio 10 related to the search for the frequency band will be described in detail in the following chapters.
 なお、ソフトウェア無線機である中継無線機10は、省電力化のため、干渉や雑音の影響の少ない周波数帯の使用と併せて、少ない送信電力により通信可能な通信方式を採用することができる。中継無線機10が微弱無線局のような消費電力のごく小さな無線機でもよい場合は、中継無線機10を電池で動作させてもよい。 Note that the relay radio 10 which is a software defined radio can adopt a communication method capable of communicating with a small transmission power in addition to using a frequency band which is less affected by interference and noise in order to save power. When the relay radio 10 may be a radio having a very small power consumption such as a weak radio station, the relay radio 10 may be operated by a battery.
1-2.中継無線機の機能
 図3は、中継無線機10の機能を具体的に説明するためのブロック図である。中継無線機10は、本開示の第1の態様の無線中継用ソフトウェア無線機に相当する。
1-2. Function of Relay Radio FIG. 3 is a block diagram for specifically explaining the function of the relay radio 10. The relay radio 10 corresponds to a software defined radio for radio relay according to the first aspect of the present disclosure.
 中継無線機10は、屋外無線機4と通信するための屋外通信用アンテナ12と、屋内無線機6と通信するための屋内通信用アンテナ14とを備える。中継無線機10に求められる機能を確保できる限りにおいて、各アンテナ12、14の本数や種類に限定はない。なお、前述の定義のとおり、屋外通信とは屋外無線機と中継無線機との間の無線通信の意味であり、屋内通信とは屋内無線機と中継無線機との間の無線通信の意味である。 The relay radio 10 includes an outdoor communication antenna 12 for communicating with the outdoor radio 4 and an indoor communication antenna 14 for communicating with the indoor radio 6. As long as the functions required for the relay radio 10 can be secured, the number and types of the antennas 12 and 14 are not limited. As defined above, outdoor communication means wireless communication between an outdoor radio and a relay radio, and indoor communication means wireless communication between an indoor radio and a relay radio. be.
 中継無線機10は、屋外通信用アンテナ12に接続された電波送信部32及び電波受信部34を備える。電波送信部32は屋外無線機4向けの電波を送信し、電波受信部34は屋外無線機4からの電波を受信する。詳しくは、電波送信部32は、デジタルのベースバンド信号をアナログ信号に変換するD/A変換器と、D/A変換器で作られたアナログのベースバンド信号を後述する屋外通信用周波数帯に変換して屋外通信用アンテナ12から送信する高周波部とを備える。電波受信部34は、屋外通信用アンテナ12から受信した無線信号を周波数変換してデジタル信号処理を行いやすいベースバンド信号に変換する高周波部と、アナログのベースバンド信号をデジタル信号に変換するA/D変換器とを備える。電波送信部32の高周波部と電波受信部34の高周波部とは一体化することができる。電波送信部32と電波受信部34とは、本開示の第1の態様の無線中継用ソフトウェア無線機が備える屋外通信用送受信部に相当する。 The relay radio 10 includes a radio wave transmitting unit 32 and a radio wave receiving unit 34 connected to the outdoor communication antenna 12. The radio wave transmitting unit 32 transmits radio waves for the outdoor radio device 4, and the radio wave receiving unit 34 receives radio waves from the outdoor radio device 4. Specifically, the radio wave transmission unit 32 has a D / A converter that converts a digital baseband signal into an analog signal, and an analog baseband signal produced by the D / A converter in a frequency band for outdoor communication, which will be described later. It is provided with a high frequency unit that is converted and transmitted from the outdoor communication antenna 12. The radio wave receiving unit 34 has a high frequency unit that converts the radio signal received from the outdoor communication antenna 12 into a baseband signal that is easy to perform digital signal processing, and an A / that converts an analog baseband signal into a digital signal. It is equipped with a D converter. The high frequency section of the radio wave transmitting section 32 and the high frequency section of the radio wave receiving section 34 can be integrated. The radio wave transmitting unit 32 and the radio wave receiving unit 34 correspond to an outdoor communication transmitting / receiving unit included in the software defined radio for radio relay according to the first aspect of the present disclosure.
 中継無線機10は、屋内通信用アンテナ14に接続された電波送信部36及び電波受信部38を備える。電波送信部36は屋内無線機6向けの電波を送信し、電波受信部38は屋内無線機6からの電波を受信する。詳しくは、電波送信部36は、デジタルのベースバンド信号をアナログ信号に変換するD/A変換器と、D/A変換器で作られたアナログのベースバンド信号を後述する屋内通信用周波数帯に変換して屋内通信用アンテナ14から送信する高周波部とを備える。電波受信部38は、屋内通信用アンテナ14から受信した無線信号を周波数変換してデジタル信号処理を行いやすいベースバンド信号に変換する高周波部と、アナログのベースバンド信号をデジタル信号に変換するA/D変換器とを備える。電波送信部36の高周波部と電波受信部38の高周波部とは一体化することができる。電波送信部36と電波受信部38とは、本開示の第1の態様の無線中継用ソフトウェア無線機が備える屋内通信用送受信部に相当する。 The relay radio 10 includes a radio wave transmitting unit 36 and a radio wave receiving unit 38 connected to the indoor communication antenna 14. The radio wave transmitting unit 36 transmits radio waves for the indoor radio device 6, and the radio wave receiving unit 38 receives radio waves from the indoor radio wave device 6. Specifically, the radio wave transmission unit 36 sets the D / A converter that converts the digital baseband signal into an analog signal and the analog baseband signal produced by the D / A converter into the frequency band for indoor communication described later. It is provided with a high frequency unit that is converted and transmitted from the indoor communication antenna 14. The radio wave receiving unit 38 has a high frequency unit that converts the radio signal received from the indoor communication antenna 14 into a baseband signal that is easy to perform digital signal processing, and an A / that converts an analog baseband signal into a digital signal. It is equipped with a D converter. The high frequency section of the radio wave transmitting section 36 and the high frequency section of the radio wave receiving section 38 can be integrated. The radio wave transmitting unit 36 and the radio wave receiving unit 38 correspond to an indoor communication transmitting / receiving unit included in the software defined radio for radio relay according to the first aspect of the present disclosure.
 中継無線機10は、さらに、信号処理部20を備える。電波送信部32及び電波受信部34は信号処理部20に接続され、電波送信部36及び電波受信部38も信号処理部20に接続されている。信号処理部20は、本開示の第1の態様の無線中継用ソフトウェア無線機が備える信号処理部に相当する。 The relay radio 10 further includes a signal processing unit 20. The radio wave transmitting unit 32 and the radio wave receiving unit 34 are connected to the signal processing unit 20, and the radio wave transmitting unit 36 and the radio wave receiving unit 38 are also connected to the signal processing unit 20. The signal processing unit 20 corresponds to the signal processing unit included in the software defined radio for wireless relay according to the first aspect of the present disclosure.
 信号処理部20はハードウェアとソフトウェア(プログラム)とを含む。信号処理部20を構成するハードウェアは、例えば、CPUやMPU等の汎用の処理装置でもよいし、デジタル信号処理装置(DSP)でもよいし、フィールドプログラマブルゲートアレイ(FPGA)でもよい。ハードウェア上でソフトウェアが動作することで、信号処理部20は、例えば、信号の符号化/復号化、入力/出力処理、データ処理など、中継無線機10が無線通信を可能にする任意の処理を実行することができる。なお、図3では、信号処理部20は、電波送信部32、36及び電波受信部34、38とは別個の構成要素として描かれている。しかし、当然ながら、信号処理部20と電波送信部32、36及び電波受信部34、38とは、一つの電子部品に統合してもよい。 The signal processing unit 20 includes hardware and software (program). The hardware constituting the signal processing unit 20 may be, for example, a general-purpose processing device such as a CPU or MPU, a digital signal processing device (DSP), or a field programmable gate array (FPGA). By operating the software on the hardware, the signal processing unit 20 may perform arbitrary processing such as signal coding / decoding, input / output processing, data processing, etc., which enables the relay radio 10 to perform wireless communication. Can be executed. In FIG. 3, the signal processing unit 20 is drawn as a component separate from the radio wave transmitting units 32 and 36 and the radio wave receiving units 34 and 38. However, as a matter of course, the signal processing unit 20, the radio wave transmitting units 32 and 36, and the radio wave receiving units 34 and 38 may be integrated into one electronic component.
 信号処理部20では、屋外無線機4との通信に使用する周波数帯及び通信方式の変更と、屋内無線機6との通信に使用する周波数帯及び通信方式の変更とを行うソフトウェアが動作する。このソフトウェアの動作により、信号処理部20は周波数帯探索部22として機能し、また、通信方式選択部24として機能する。 The signal processing unit 20 operates software that changes the frequency band and communication method used for communication with the outdoor radio 4 and changes the frequency band and communication method used for communication with the indoor radio 6. By the operation of this software, the signal processing unit 20 functions as a frequency band search unit 22 and also as a communication method selection unit 24.
 周波数帯探索部22は、屋外無線機4との通信において、良好な通信品質を提供可能な周波数帯を探索する。まず、周波数帯探索部22は、キャリアセンスによって他からの干渉や雑音の影響が少ない周波数帯を探索する。さらに、周波数帯探索部22は、屋外無線機4からの電波を受信し、受信レベルが高く、且つ、C/Nが閾値以上の広帯域な周波数帯を探索する。これら2回の探索で得られた周波数帯の共通部分が良好な通信品質を提供可能な周波数帯である。信号処理部20は、周波数帯探索部22で探索された周波数帯を用いて屋外無線機4と通信するように電波送信部32及び電波受信部34を制御する。 The frequency band search unit 22 searches for a frequency band that can provide good communication quality in communication with the outdoor radio 4. First, the frequency band search unit 22 searches for a frequency band that is less affected by interference and noise from others by carrier sense. Further, the frequency band search unit 22 receives the radio wave from the outdoor radio 4 and searches for a wide band frequency band having a high reception level and a C / N equal to or higher than the threshold value. The common part of the frequency band obtained by these two searches is the frequency band capable of providing good communication quality. The signal processing unit 20 controls the radio wave transmitting unit 32 and the radio wave receiving unit 34 so as to communicate with the outdoor radio 4 using the frequency band searched by the frequency band searching unit 22.
 周波数帯探索部22は、同様の処理を屋内無線機6との通信においても行い、屋内無線機6との通信において良好な通信品質を提供可能な周波数帯を探索する。ただし、屋内無線機6が複数設置されている場合には、周波数帯探索部22は、屋内無線機6毎に周波数帯の探索を実施する。信号処理部20は、周波数帯探索部22で探索された周波数帯を用いて屋内無線機6と通信するように電波送信部36及び電波受信部38を制御する。 The frequency band search unit 22 performs the same processing in the communication with the indoor radio 6, and searches for a frequency band that can provide good communication quality in the communication with the indoor radio 6. However, when a plurality of indoor radios 6 are installed, the frequency band search unit 22 searches for a frequency band for each indoor radio 6. The signal processing unit 20 controls the radio wave transmitting unit 36 and the radio wave receiving unit 38 so as to communicate with the indoor radio 6 using the frequency band searched by the frequency band searching unit 22.
 通信方式選択部24は、周波数帯探索部22で探索された周波数帯を用いて屋外無線機4及び屋内無線機6との通信が開始される際、省電力で通信可能な通信方式を選択する。そのような通信方式には、例えば、低C/Nで受信可能な多値数の少ない変調方式が含まれる。通信方式選択部24は、選択した通信方式で通信を行うように電波送信部32及び電波受信部34、並びに電波送信部36及び電波受信部38を制御する。 The communication method selection unit 24 selects a power-saving communication method when communication with the outdoor radio device 4 and the indoor radio device 6 is started using the frequency band searched by the frequency band search unit 22. .. Such a communication method includes, for example, a modulation method having a small number of multivalues that can be received at a low C / N. The communication method selection unit 24 controls the radio wave transmission unit 32 and the radio wave reception unit 34, and the radio wave transmission unit 36 and the radio wave reception unit 38 so that communication is performed by the selected communication method.
1-3.屋外通信に係る中継無線機の機能の詳細
 屋外無線機4との通信に係る中継無線機10の機能について、図4を用いてより具体的に説明する。図4は、本無線中継システム2において屋外無線機4と中継無線機10との間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。屋外無線機4と中継無線機10との間で通信を開始するに際し、使用する周波数帯が両者の間で決定される。図4には、屋外通信で使用する周波数帯を探索し、探索した周波数帯で通信を開始するまでの手順が示されている。
1-3. Details of the Function of the Relay Radio Related to Outdoor Communication The function of the relay radio device 10 related to communication with the outdoor radio device 4 will be described more specifically with reference to FIG. FIG. 4 is a flowchart for explaining the contents of the process executed between the outdoor radio device 4 and the relay radio device 10 in the wireless relay system 2. When starting communication between the outdoor radio 4 and the relay radio 10, the frequency band to be used is determined between the two. FIG. 4 shows a procedure for searching for a frequency band used for outdoor communication and starting communication in the searched frequency band.
 まず、中継無線機10は、キャリアセンスにより、干渉や雑音が閾値以下の周波数帯Aを探索する(ステップS10)。具体的には、中継無線機10は、屋外無線機4との通信を行っていない状態において受信モードを選択し、中継無線機10が使用できる各周波数帯での受信電力を測定する。ここで測定される受信電力が干渉や雑音のレベルを表している。中継無線機10は、周波数帯毎に受信電力を閾値と比較し、受信電力が閾値以下になる周波数帯Aを探索する。キャリアセンスで用いられる閾値は、他の無線機が当該周波数帯を使用していないと判断できる受信電力である。ステップS10で探索される周波数帯Aは、本開示の第1の態様の無線中継用ソフトウェア無線機において探索される第1周波数帯に相当する。 First, the relay radio 10 searches for the frequency band A in which interference and noise are equal to or less than the threshold value by carrier sense (step S10). Specifically, the relay radio 10 selects a reception mode in a state where communication with the outdoor radio 4 is not performed, and measures the reception power in each frequency band that the relay radio 10 can use. The received power measured here represents the level of interference or noise. The relay radio 10 compares the received power with the threshold value for each frequency band, and searches for the frequency band A in which the received power is equal to or less than the threshold value. The threshold value used in carrier sense is the received power at which it can be determined that another radio device is not using the frequency band. The frequency band A searched in step S10 corresponds to the first frequency band searched in the software defined radio for radio relay according to the first aspect of the present disclosure.
 中継無線機10によるキャリアセンスの実施後、屋外無線機4は、屋外無線機4が送信可能な周波数で電波を送信する(ステップS20)。具体的には、屋外無線機4は、ハードウェアの切り替えによって選択可能な複数の周波数帯の中から順に周波数帯を選択し、選択した周波数帯の電波を送信する。 After the carrier sense is performed by the relay radio 10, the outdoor radio 4 transmits radio waves at a frequency that the outdoor radio 4 can transmit (step S20). Specifically, the outdoor radio 4 selects a frequency band in order from a plurality of frequency bands that can be selected by switching hardware, and transmits radio waves in the selected frequency band.
 屋外無線機4によるステップS20の処理に続いて、中継無線機10ではステップS12の処理が行われる。中継無線機10は、屋外無線機4からの電波を受信し、受信した電波の受信レベルが相対的に高く、且つ当該電波のC/Nが閾値以上になる周波数帯Bを探索する(ステップS12)。屋外無線機4から受信する電波は、屋外無線機4が選択可能な周波数帯の電波に限られている。中継無線機10は、受信した電波のC/Nが閾値以上になる周波数帯の中で、相対的に受信レベルが高く、且つ、より広帯域の周波数帯Bを探索する。中継無線機10が屋外無線機4から受信する電波は家屋の境界面8を通過するため、受信電波の受信レベルは透過損失の影響を受ける。透過損失が小さければ受信レベルは高くなる。また、使用する周波数帯が広帯域であるほど、高い伝送速度を確保することができる。ステップS12で探索される周波数帯Bは、本開示の第1の態様の無線中継用ソフトウェア無線機において探索される第2周波数帯に相当する。 Following the process of step S20 by the outdoor radio 4, the process of step S12 is performed by the relay radio 10. The relay radio 10 receives the radio wave from the outdoor radio 4, and searches for a frequency band B in which the reception level of the received radio wave is relatively high and the C / N of the radio wave is equal to or higher than the threshold value (step S12). ). The radio wave received from the outdoor radio 4 is limited to the radio wave in the frequency band that can be selected by the outdoor radio 4. The relay radio 10 searches for a frequency band B having a relatively high reception level and a wider band band in the frequency band in which the C / N of the received radio wave is equal to or higher than the threshold value. Since the radio wave received by the relay radio 10 from the outdoor radio 4 passes through the boundary surface 8 of the house, the reception level of the received radio wave is affected by the transmission loss. The smaller the transmission loss, the higher the reception level. Further, the wider the frequency band used, the higher the transmission speed can be ensured. The frequency band B searched for in step S12 corresponds to the second frequency band searched for in the software defined radio for radio relay according to the first aspect of the present disclosure.
 次に、中継無線機10は、周波数帯Aと周波数帯Bとが重なる周波数帯Cを求める。周波数帯Cは、他の無線機において使用されておらず、家屋の境界面8での透過損失が少なく、且つ、干渉及び雑音の影響の少ない周波数帯、すなわち、良好な通信品質が得られる周波数帯である。周波数帯Cは、本開示の無線中継システム及び無線中継方法における屋外通信用周波数帯に相当する。中継無線機10は、予め定めておいた周波数帯を用いて周波数帯Cを屋外無線機4に通知する(以上、ステップS14)。屋外無線機4は、中継無線機10から通知された周波数帯Cで通信を開始する(ステップS22)。 Next, the relay radio 10 obtains a frequency band C in which the frequency band A and the frequency band B overlap. The frequency band C is a frequency band that is not used in other radios, has a small transmission loss at the boundary surface 8 of the house, and is less affected by interference and noise, that is, a frequency at which good communication quality can be obtained. It is a band. The frequency band C corresponds to the frequency band for outdoor communication in the wireless relay system and the wireless relay method of the present disclosure. The relay radio 10 notifies the outdoor radio 4 of the frequency band C using a predetermined frequency band (above, step S14). The outdoor radio 4 starts communication in the frequency band C notified by the relay radio 10 (step S22).
1-4.屋内通信に係る中継無線機の機能の詳細
 次に、屋内無線機6との通信に係る中継無線機10の機能について、図5を用いてより具体的に説明する。図5は、本無線中継システム2において屋内無線機6と中継無線機10との間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。屋外無線機4の場合と同様に、屋内無線機6と中継無線機10との間で通信を開始するに際し、使用する周波数帯が両者の間で決定される。ただし、屋内無線機6が複数設置されている場合、屋内無線機6毎に図5に示す手順に従って使用する周波数帯が決定される。図5には、屋内通信で使用する周波数帯を探索し、探索した周波数帯で通信を開始するまでの手順が示されている。
1-4. Details of the Function of the Relay Radio for Indoor Communication Next, the function of the relay radio 10 for communication with the indoor radio 6 will be described more specifically with reference to FIG. FIG. 5 is a flowchart for explaining the contents of the process executed between the indoor radio device 6 and the relay radio device 10 in the wireless relay system 2. Similar to the case of the outdoor radio 4, when starting communication between the indoor radio 6 and the relay radio 10, the frequency band to be used is determined between the two. However, when a plurality of indoor radios 6 are installed, the frequency band to be used is determined for each indoor radio 6 according to the procedure shown in FIG. FIG. 5 shows a procedure for searching for a frequency band used for indoor communication and starting communication in the searched frequency band.
 まず、中継無線機10は、キャリアセンスにより、干渉や雑音が閾値以下の周波数帯Dを探索する(ステップS30)。具体的には、中継無線機10は、屋内無線機6との通信を行っていない状態において受信モードを選択し、中継無線機10が使用できる各周波数帯での受信電力を測定する。中継無線機10は、周波数帯毎に受信電力を閾値と比較し、受信電力が閾値以下になる周波数帯Dを探索する。ステップS30で用いられる閾値は、ステップS10で用いられる閾値と必ずしも同じ値である必要はない。ステップS30で探索される周波数帯Dは、本開示の第1の態様の無線中継用ソフトウェア無線機において探索される第3周波数帯に相当する。 First, the relay radio 10 searches for the frequency band D in which interference and noise are equal to or less than the threshold value by carrier sense (step S30). Specifically, the relay radio 10 selects a reception mode in a state where communication with the indoor radio 6 is not performed, and measures the reception power in each frequency band that the relay radio 10 can use. The relay radio 10 compares the received power with the threshold value for each frequency band, and searches for the frequency band D in which the received power is equal to or less than the threshold value. The threshold value used in step S30 does not necessarily have to be the same value as the threshold value used in step S10. The frequency band D searched for in step S30 corresponds to the third frequency band searched for in the software defined radio for radio relay according to the first aspect of the present disclosure.
 中継無線機10によるキャリアセンスの実施後、屋内無線機6は、屋内無線機6が送信可能な周波数で電波を送信する(ステップS40)。具体的には、屋内無線機6は、ハードウェアの切り替えによって選択可能な複数の周波数帯の中から順に周波数帯を選択し、選択した周波数帯の電波を送信する。 After the carrier sense is performed by the relay radio 10, the indoor radio 6 transmits radio waves at a frequency that the indoor radio 6 can transmit (step S40). Specifically, the indoor radio 6 selects a frequency band in order from a plurality of frequency bands that can be selected by switching hardware, and transmits radio waves in the selected frequency band.
 屋内無線機6によるステップS40の処理に続いて、中継無線機10ではステップS32の処理が行われる。中継無線機10は、屋内無線機6からの電波を受信し、受信した電波の受信レベルが相対的に高く、且つ当該電波のC/Nが閾値以上になる周波数帯Eを探索する(ステップS32)。屋内無線機6から受信する電波は、屋内無線機6が選択可能な周波数帯の電波に限られている。中継無線機10は、受信した電波のC/Nが閾値以上になる周波数帯の中で、相対的に受信レベルが高く、且つ、より広帯域の周波数帯Eを探索する。中継無線機10と屋内無線機6との通信は、屋内無線機6の設置場所に依存して見通し外通信となる。その場合、受信電波の受信レベルは回折損失の影響を受けるが、回折損失が小さければ受信レベルは高くなる。また、使用する周波数帯が広帯域であるほど、高い伝送速度を確保することができる。ステップS32で探索される周波数帯Eは、本開示の第1の態様の無線中継用ソフトウェア無線機において探索される第4周波数帯に相当する。 Following the processing of step S40 by the indoor radio 6, the processing of step S32 is performed by the relay radio 10. The relay radio 10 receives the radio wave from the indoor radio 6, and searches for a frequency band E in which the reception level of the received radio wave is relatively high and the C / N of the radio wave is equal to or higher than the threshold value (step S32). ). The radio wave received from the indoor radio 6 is limited to the radio wave in the frequency band that can be selected by the indoor radio 6. The relay radio 10 searches for a frequency band E having a relatively high reception level and a wider band in the frequency band in which the C / N of the received radio wave is equal to or higher than the threshold value. Communication between the relay radio 10 and the indoor radio 6 is non-line-of-sight communication depending on the installation location of the indoor radio 6. In that case, the reception level of the received radio wave is affected by the diffraction loss, but if the diffraction loss is small, the reception level becomes high. Further, the wider the frequency band used, the higher the transmission speed can be ensured. The frequency band E searched in step S32 corresponds to the fourth frequency band searched in the software defined radio for radio relay according to the first aspect of the present disclosure.
 次に、中継無線機10は、周波数帯Dと周波数帯Eとが重なる周波数帯Fを求める。周波数帯Fは、屋内無線機6と中継無線機10との間において最も良好な通信品質が得られる周波数帯である。周波数帯Fは、本開示の無線中継システム及び無線中継方法における屋内通信用周波数帯に相当する。中継無線機10は、予め定めておいた周波数帯を用いて周波数帯Fを屋内無線機6に通知する(以上、ステップS34)。屋内無線機6は、中継無線機10から通知された周波数帯Fで通信を開始する(ステップS42)。 Next, the relay radio 10 obtains a frequency band F in which the frequency band D and the frequency band E overlap. The frequency band F is a frequency band in which the best communication quality can be obtained between the indoor radio 6 and the relay radio 10. The frequency band F corresponds to the frequency band for indoor communication in the wireless relay system and the wireless relay method of the present disclosure. The relay radio 10 notifies the indoor radio 6 of the frequency band F using a predetermined frequency band (above, step S34). The indoor radio 6 starts communication in the frequency band F notified by the relay radio 10 (step S42).
1-5.効果
 以上の手順で屋外無線機4と中継無線機10との間の通信が行われ、且つ、屋内無線機6と中継無線機10との間の通信が行われることで、通信環境が通信品質に与える影響を低減し、良好な通信品質で無線中継を行うことが可能となる。
1-5. Effect By the above procedure, the communication between the outdoor radio 4 and the relay radio 10 is performed, and the communication between the indoor radio 6 and the relay radio 10 is performed, so that the communication environment is improved in communication quality. It is possible to perform wireless relay with good communication quality by reducing the influence on.
2.第2実施形態
2-1.概要
 図6は、本開示の第2実施形態に係る無線中継システムの概要を説明するための図である。本無線中継システム102は、第1実施形態と同様に、屋外に設置された屋外無線機140と、屋内に設置された屋内無線機170との無線通信を中継無線機110によって中継するシステムである。中継無線機110は、1台の屋外無線機140と1又は複数台の屋内無線機170とを中継する。本実施形態では、中継無線機110は家屋の境界面8の屋内側に貼り付けられているものとする。
2. 2. 2nd Embodiment 2-1. Outline FIG. 6 is a diagram for explaining the outline of the wireless relay system according to the second embodiment of the present disclosure. Similar to the first embodiment, the wireless relay system 102 is a system that relays wireless communication between the outdoor wireless device 140 installed outdoors and the indoor wireless device 170 installed indoors by the relay wireless device 110. .. The relay radio 110 relays one outdoor radio 140 and one or a plurality of indoor radios 170. In the present embodiment, it is assumed that the relay radio 110 is attached to the indoor side of the boundary surface 8 of the house.
 本無線中継システム102では、第1実施形態と同様に、中継無線機110はソフトウェア無線機として構成されている。また、第1実施形態と同様に、屋外無線機140及び屋内無線機170は複数の周波数帯の中から使用する周波数帯を選択可能に構成されている。ただし、本無線中継システム102では、屋外無線機140及び屋内無線機170はソフトウェア無線機に限定される。ソフトウェア無線機である屋外無線機140及び屋内無線機170は、第1実施形態よりも選択可能な周波数帯が広く、且つ、より多くの通信方式と周波数の組合せを選択することができる。つまり、屋外無線機140及び屋内無線機170は、中継無線機110が有する機能と同等の機能を有している。 In the wireless relay system 102, the relay radio 110 is configured as a software defined radio as in the first embodiment. Further, as in the first embodiment, the outdoor radio device 140 and the indoor radio device 170 are configured so that the frequency band to be used can be selected from a plurality of frequency bands. However, in the wireless relay system 102, the outdoor radio 140 and the indoor radio 170 are limited to software defined radios. The outdoor radio 140 and the indoor radio 170, which are software defined radios, have a wider selectable frequency band than the first embodiment, and more communication methods and frequency combinations can be selected. That is, the outdoor radio 140 and the indoor radio 170 have the same functions as those of the relay radio 110.
 本無線中継システム102では、中継無線機110と屋外無線機140との協働により、また、中継無線機110と屋内無線機170との協働により、家屋の境界面8での透過損失が少なく、良好な通信品質が得られる周波数帯が探索される。中継無線機110と屋外無線機140との通信においては、他の無線機からの干渉及び雑音の影響が少なく、中継無線機110で受信される屋外無線機140からの電波の受信レベルが相対的に高く、且つ当該電波のC/Nが高い広帯域な周波数帯が探索される。中継無線機110と屋内無線機170との通信においては、他の無線機からの干渉及び雑音の影響が少なく、中継無線機110で受信される屋内無線機6からの電波の受信レベルが相対的に高く、且つ当該電波のC/Nが高い広帯域な周波数帯が屋内無線機6毎に探索される。周波数帯の探索に係る各無線機110、140、170の機能については次章以降において詳細に説明する。 In this wireless relay system 102, the transmission loss at the boundary surface 8 of the house is small due to the cooperation between the relay radio 110 and the outdoor radio 140 and the cooperation between the relay radio 110 and the indoor radio 170. , A frequency band where good communication quality can be obtained is searched. In the communication between the relay radio 110 and the outdoor radio 140, the influence of interference and noise from other radios is small, and the reception level of the radio wave from the outdoor radio 140 received by the relay radio 110 is relative. A wide band frequency band having a high C / N of the radio wave is searched for. In the communication between the relay radio 110 and the indoor radio 170, the influence of interference and noise from other radios is small, and the reception level of the radio wave from the indoor radio 6 received by the relay radio 110 is relative. A wide band frequency band having a high C / N of the radio wave is searched for for each indoor radio 6. The functions of the radios 110, 140, and 170 related to the frequency band search will be described in detail in the following chapters.
 さらに、本無線中継システム102では、中継無線機110だけでなく、屋外無線機140と屋内無線機170もソフトウェア無線機として構成されているため、周波数帯を束ねて使用するキャリアアグリゲーションを用意に行うことができる。具体例を挙げると、図6に示す例では、周波数帯1、2、3が中継無線機110と屋外無線機140との間での通信に適した周波数帯である。しかし、周波数帯1、2、3の間には、透過損失が大きいために使用できない周波数帯が挟まれている。このため、この例では、連続した広帯域な周波数帯を確保することはできず、所望の伝送速度を得られない可能性がある。このような場合、キャリアアグリゲーションによって周波数帯1、2、3を束ねることで、複数の周波数帯1、2、3を同時に使用することが可能となる。 Further, in the wireless relay system 102, not only the relay radio 110 but also the outdoor radio 140 and the indoor radio 170 are configured as software defined radios, so that carrier aggregation to be used by bundling frequency bands is easily performed. be able to. To give a specific example, in the example shown in FIG. 6, frequency bands 1, 2 and 3 are frequency bands suitable for communication between the relay radio 110 and the outdoor radio 140. However, a frequency band that cannot be used due to a large transmission loss is sandwiched between the frequency bands 1, 2, and 3. Therefore, in this example, it is not possible to secure a continuous wide band frequency band, and there is a possibility that a desired transmission speed cannot be obtained. In such a case, by bundling frequency bands 1, 2, and 3 by carrier aggregation, it is possible to use a plurality of frequency bands 1, 2, and 3 at the same time.
 同様に、中継無線機110と屋内無線機170との間でもキャリアアグリゲーションが行われる。見通し外通信では回折損失が大きく使用できない周波数帯が生じるので、キャリアアグリゲーションによって周波数帯を束ねることは有効である。屋内無線機170が複数設置されている場合には、キャリアアグリゲーションは屋内無線機170毎に行われる。図6に示す例では、一つの屋内無線機170との間では、周波数帯4、5、6が束ねられ、別の屋内無線機170との間では、周波数帯7、8が束ねられている。 Similarly, carrier aggregation is performed between the relay radio 110 and the indoor radio 170. Since there is a frequency band that cannot be used due to large diffraction loss in non-line-of-sight communication, it is effective to bundle the frequency bands by carrier aggregation. When a plurality of indoor radios 170 are installed, carrier aggregation is performed for each indoor radio 170. In the example shown in FIG. 6, frequency bands 4, 5 and 6 are bundled with one indoor radio 170, and frequency bands 7, 8 are bundled with another indoor radio 170. ..
 なお、ソフトウェア無線機である各無線機110、140、170は、省電力化のため、干渉や雑音の影響の少ない周波数帯の使用と併せて、少ない送信電力により通信可能な通信方式を採用することができる。各無線機110、140、170が微弱無線局のような消費電力のごく小さな無線機でもよい場合は、各無線機110、140、170を電池で動作させてもよい。 In addition, each of the radios 110, 140, and 170, which are software defined radios, adopts a communication method capable of communicating with a small transmission power in addition to using a frequency band that is less affected by interference and noise in order to save power. be able to. When the radios 110, 140, 170 may be radios having very small power consumption such as a weak radio station, the radios 110, 140, 170 may be operated by batteries.
2-2.中継無線機の機能
 図7は、中継無線機110の機能を具体的に説明するためのブロック図である。図7において、図3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。
2-2. Function of Relay Radio FIG. 7 is a block diagram for specifically explaining the function of the relay radio 110. In FIG. 7, the same elements as those shown in FIG. 3 are designated by a common reference numeral, and the description thereof will be omitted or simplified.
 中継無線機110は、本開示の第2の態様の無線中継用ソフトウェア無線機に相当する。電波送信部32と電波受信部34は、本開示の第2の態様の無線中継用ソフトウェア無線機が備える屋外通信用送受信部に相当する。電波送信部36と電波受信部38は、本開示の第2の態様の無線中継用ソフトウェア無線機が備える屋内通信用送受信部に相当する。これらの要素に加え、中継無線機110は、ユーザ設定入力部128と信号処理部120とを備える。 The relay radio 110 corresponds to the software defined radio for radio relay according to the second aspect of the present disclosure. The radio wave transmitting unit 32 and the radio wave receiving unit 34 correspond to the outdoor communication transmitting / receiving unit included in the software defined radio for radio relay according to the second aspect of the present disclosure. The radio wave transmitting unit 36 and the radio wave receiving unit 38 correspond to an indoor communication transmitting / receiving unit included in the software defined radio for radio relay according to the second aspect of the present disclosure. In addition to these elements, the relay radio 110 includes a user setting input unit 128 and a signal processing unit 120.
 ユーザ設定入力部128は、ユーザ200からの中継無線機110に対する種々の設定の入力を受け付けるユーザインタフェースである。ユーザ200が入力可能な設定には、中継無線機110と屋外無線機140及び屋内無線機170との間の伝送速度が含まれる。ユーザ設定入力部128は、入力されたユーザ200が希望する伝送速度を信号処理部120に対して設定する。なお、ユーザ200自身がユーザ設定入力部128へ直接入力することに代えて、他の無線端末からの無線通信によってユーザ200の希望する伝送速度を取得し、信号処理部120に対して設定してもよい。 The user setting input unit 128 is a user interface that receives input of various settings to the relay radio 110 from the user 200. The settings that can be input by the user 200 include the transmission speed between the relay radio 110 and the outdoor radio 140 and the indoor radio 170. The user setting input unit 128 sets the input transmission speed desired by the user 200 with respect to the signal processing unit 120. Instead of inputting directly to the user setting input unit 128 by the user 200 itself, the transmission speed desired by the user 200 is acquired by wireless communication from another wireless terminal and set for the signal processing unit 120. May be good.
 信号処理部120は、本開示の第2の態様の無線中継用ソフトウェア無線機が備える信号処理部に相当する。信号処理部120は、例えば、汎用の処理装置でもよいし、DSPでもよいし、FPGAでもよい。信号処理部120は、例えば、信号の符号化/復号化、入力/出力処理、データ処理など、中継無線機110が無線通信を可能にする任意の処理を実行することができる。なお、図7では、信号処理部120は、電波送信部32、36及び電波受信部34、38とは別個の構成要素として描かれている。しかし、当然ながら、信号処理部120と電波送信部32、36及び電波受信部34、38とは、一つの電子部品に統合してもよい。 The signal processing unit 120 corresponds to the signal processing unit included in the software defined radio for wireless relay according to the second aspect of the present disclosure. The signal processing unit 120 may be, for example, a general-purpose processing device, a DSP, or an FPGA. The signal processing unit 120 can execute any processing that enables the relay radio 110 to perform wireless communication, such as signal coding / decoding, input / output processing, and data processing. In FIG. 7, the signal processing unit 120 is drawn as a component separate from the radio wave transmitting units 32 and 36 and the radio wave receiving units 34 and 38. However, as a matter of course, the signal processing unit 120, the radio wave transmitting units 32 and 36, and the radio wave receiving units 34 and 38 may be integrated into one electronic component.
 信号処理部120では、屋外無線機140との通信に使用する周波数帯及び通信方式の変更と、屋内無線機170との通信に使用する周波数帯及び通信方式の変更とを行うソフトウェアが動作する。このソフトウェアの動作により、信号処理部120は周波数帯探索部122として機能し、通信方式選択部124として機能し、さらに、周波数帯幅算出部126として機能する。 The signal processing unit 120 operates software that changes the frequency band and communication method used for communication with the outdoor radio 140 and changes the frequency band and communication method used for communication with the indoor radio 170. By the operation of this software, the signal processing unit 120 functions as a frequency band search unit 122, a communication method selection unit 124, and further functions as a frequency bandwidth calculation unit 126.
 周波数帯探索部122は、屋外無線機140との通信において、良好な通信品質を提供可能な周波数帯を探索する。まず、周波数帯探索部122は、屋外無線機140と通信していない状態において、中継無線機110と屋外無線機140の双方において他からの干渉や雑音の影響が少ない周波数帯をキャリアセンスによって探索する。さらに、周波数帯探索部122は、キャリアセンスによって探索された周波数帯のうち、中継無線機110と屋外無線機140の双方において受信レベルが相対的に高く且つC/Nが閾値以上になる周波数帯を屋外無線機140との協働により探索する。このようにして探索された周波数帯が中継無線機110と屋外無線機140との間で良好な通信品質を提供可能な周波数帯である。信号処理部120は、周波数帯探索部122で探索された周波数帯を用いて屋外無線機140と通信するように電波送信部32及び電波受信部34を制御する。 The frequency band search unit 122 searches for a frequency band that can provide good communication quality in communication with the outdoor radio 140. First, the frequency band search unit 122 searches for a frequency band in both the relay radio 110 and the outdoor radio 140 that is less affected by interference and noise from others in a state of not communicating with the outdoor radio 140 by carrier sense. do. Further, the frequency band search unit 122 has a frequency band in which the reception level is relatively high and the C / N is equal to or higher than the threshold value in both the relay radio 110 and the outdoor radio 140 among the frequency bands searched by the carrier sense. In collaboration with the outdoor radio 140. The frequency band searched in this way is a frequency band capable of providing good communication quality between the relay radio 110 and the outdoor radio 140. The signal processing unit 120 controls the radio wave transmitting unit 32 and the radio wave receiving unit 34 so as to communicate with the outdoor radio 140 using the frequency band searched by the frequency band searching unit 122.
 周波数帯探索部122は、同様の処理を屋内無線機170との通信においても行い、屋内無線機170との通信において良好な通信品質を提供可能な周波数帯を探索する。ただし、屋内無線機170が複数設置されている場合には、周波数帯探索部122は、屋内無線機170毎に周波数帯の探索を実施する。信号処理部120は、周波数帯探索部122で探索された周波数帯を用いて屋内無線機170と通信するように電波送信部36及び電波受信部38を制御する。 The frequency band search unit 122 performs the same processing in the communication with the indoor radio 170, and searches for a frequency band capable of providing good communication quality in the communication with the indoor radio 170. However, when a plurality of indoor radios 170 are installed, the frequency band search unit 122 searches for a frequency band for each indoor radio 170. The signal processing unit 120 controls the radio wave transmitting unit 36 and the radio wave receiving unit 38 so as to communicate with the indoor radio 170 using the frequency band searched by the frequency band searching unit 122.
 周波数帯幅算出部126には、ユーザ設定入力部128からユーザ200が希望する伝送速度が入力される。周波数帯幅算出部126は、ユーザ200の希望する伝送速度(指定伝送速度)を実現するための目標周波数帯幅を算出する。周波数帯探索部122で探索された周波数帯の中には目標周波数帯幅を満たす連続した広帯域の周波数帯がない場合、周波数帯幅算出部126は、複数の周波数帯を束ねてキャリアアグリゲーションを行う。 The transmission speed desired by the user 200 is input from the user setting input unit 128 to the frequency bandwidth calculation unit 126. The frequency bandwidth calculation unit 126 calculates a target frequency bandwidth for realizing the transmission speed (designated transmission speed) desired by the user 200. When there is no continuous wide band frequency band satisfying the target frequency band width in the frequency band searched by the frequency band search unit 122, the frequency band width calculation unit 126 bundles a plurality of frequency bands and performs carrier aggregation. ..
 通信方式選択部124は、周波数帯探索部122で探索された周波数帯、或いは、周波数帯幅算出部126で束ねられた周波数帯を用いて屋外無線機140或いは屋内無線機170との通信が開始される際、省電力で通信可能な通信方式を選択する。例えば、通信方式選択部124は、低C/Nで受信可能な多値数の少ない変調方式を選択する。通信方式選択部124は、選択した通信方式で通信を行うように電波送信部32及び電波受信部34、並びに電波送信部36及び電波受信部38を制御する。 The communication method selection unit 124 starts communication with the outdoor radio 140 or the indoor radio 170 using the frequency band searched by the frequency band search unit 122 or the frequency band bundled by the frequency band width calculation unit 126. When this is done, select a communication method that can communicate with low power consumption. For example, the communication method selection unit 124 selects a modulation method having a small number of multivalues that can be received at a low C / N. The communication method selection unit 124 controls the radio wave transmission unit 32 and the radio wave reception unit 34, and the radio wave transmission unit 36 and the radio wave reception unit 38 so that communication is performed by the selected communication method.
2-3.屋外無線機及び屋内無線機の機能
 図8は、屋外無線機140及び屋内無線機170の機能を説明するためのブロック図である。屋外無線機140と屋内無線機170は共通の機能を有しているので、ここでは、代表して屋外無線機140の機能について説明する。
2-3. Functions of Outdoor Radio and Indoor Radio FIG. 8 is a block diagram for explaining the functions of the outdoor radio 140 and the indoor radio 170. Since the outdoor radio 140 and the indoor radio 170 have a common function, the function of the outdoor radio 140 will be described here as a representative.
 屋外無線機140は、中継無線機110と通信するためのアンテナ142を備える。屋外無線機140に求められる機能を確保できる限りにおいて、アンテナ142の本数や種類に限定はない。屋外無線機140は、アンテナ142に接続された電波送信部162及び電波受信部164を備える。電波送信部162は中継無線機110向けの電波を送信し、電波受信部164は中継無線機110からの電波を受信する。詳しくは、電波送信部162はD/A変換器と高周波部とを備え、電波受信部164は高周波部とA/D変換器とを備える。電波送信部162の高周波部と電波受信部164の高周波部とは一体化することができる。 The outdoor radio 140 is provided with an antenna 142 for communicating with the relay radio 110. The number and types of antennas 142 are not limited as long as the functions required for the outdoor radio 140 can be secured. The outdoor radio 140 includes a radio wave transmitting unit 162 and a radio wave receiving unit 164 connected to the antenna 142. The radio wave transmitting unit 162 transmits the radio wave for the relay radio 110, and the radio wave receiving unit 164 receives the radio wave from the relay radio 110. Specifically, the radio wave transmitting unit 162 includes a D / A converter and a high frequency unit, and the radio wave receiving unit 164 includes a high frequency unit and an A / D converter. The high frequency section of the radio wave transmitting section 162 and the high frequency section of the radio wave receiving section 164 can be integrated.
 屋外無線機140は、さらに、ユーザ設定入力部158と信号処理部150とを備える。ユーザ設定入力部158には、ユーザ200が希望する伝送速度を含め屋外無線機140に対する種々の設定が入力される。ユーザ設定入力部158は、入力されたユーザ200が希望する伝送速度を信号処理部150に対して設定する。なお、中継無線機110から無線通信によってユーザ200が希望する伝送速度を取得し、取得した伝送速度を信号処理部150に対して設定してもよい。 The outdoor radio unit 140 further includes a user setting input unit 158 and a signal processing unit 150. Various settings for the outdoor radio 140 including the transmission speed desired by the user 200 are input to the user setting input unit 158. The user setting input unit 158 sets the input transmission speed desired by the user 200 with respect to the signal processing unit 150. The transmission speed desired by the user 200 may be acquired from the relay radio 110 by wireless communication, and the acquired transmission speed may be set for the signal processing unit 150.
 信号処理部150は、例えば、汎用の処理装置でもよいし、DSPでもよいし、FPGAでもよい。信号処理部150は、例えば、信号の符号化/復号化、入力/出力処理、データ処理など、屋外無線機140が無線通信を可能にする任意の処理を実行することができる。なお、図8では、信号処理部150は、電波送信部162及び電波受信部164とは別個の構成要素として描かれている。しかし、当然ながら、信号処理部150と電波送信部162及び電波受信部164とは、一つの電子部品に統合してもよい。 The signal processing unit 150 may be, for example, a general-purpose processing device, a DSP, or an FPGA. The signal processing unit 150 can execute any processing that enables the outdoor radio 140 to perform wireless communication, such as signal coding / decoding, input / output processing, and data processing. In FIG. 8, the signal processing unit 150 is drawn as a component separate from the radio wave transmitting unit 162 and the radio wave receiving unit 164. However, as a matter of course, the signal processing unit 150, the radio wave transmitting unit 162, and the radio wave receiving unit 164 may be integrated into one electronic component.
 信号処理部150では、中継無線機110との通信に使用する周波数帯及び通信方式の変更を行うソフトウェアが動作する。このソフトウェアの動作により、信号処理部150は周波数帯探索部152として機能し、通信方式選択部154として機能し、さらに、周波数帯幅算出部156として機能する。周波数帯探索部152は電波受信部164に接続され、通信方式選択部154は電波送信部162に接続され、周波数帯幅算出部156はユーザ設定入力部158に接続されている。 The signal processing unit 150 operates software that changes the frequency band and communication method used for communication with the relay radio 110. By the operation of this software, the signal processing unit 150 functions as a frequency band search unit 152, a communication method selection unit 154, and further functions as a frequency band width calculation unit 156. The frequency band search unit 152 is connected to the radio wave reception unit 164, the communication method selection unit 154 is connected to the radio wave transmission unit 162, and the frequency band width calculation unit 156 is connected to the user setting input unit 158.
 周波数帯探索部152は、中継無線機110との通信において、良好な通信品質を提供可能な周波数帯を中継無線機110と協働で探索する。まず、周波数帯探索部152は、中継無線機110と通信していない状態において、中継無線機110と屋外無線機140の双方において他からの干渉や雑音の影響が少ない周波数帯をキャリアセンスによって探索する。さらに、周波数帯探索部152は、キャリアセンスによって探索された周波数帯のうち、中継無線機110と屋外無線機140の双方において受信レベルが相対的に高く且つC/Nが閾値以上になる周波数帯を中継無線機110との協働により探索する。信号処理部150は、周波数帯探索部152で探索された周波数帯を用いて中継無線機110と通信するように電波送信部162及び電波受信部164を制御する。 The frequency band search unit 152 searches for a frequency band that can provide good communication quality in cooperation with the relay radio 110 in communication with the relay radio 110. First, the frequency band search unit 152 searches for a frequency band in which the influence of interference and noise from others is small in both the relay radio 110 and the outdoor radio 140 in a state of not communicating with the relay radio 110 by carrier sense. do. Further, among the frequency bands searched by the carrier sense, the frequency band search unit 152 has a frequency band in which the reception level is relatively high and the C / N is equal to or higher than the threshold value in both the relay radio 110 and the outdoor radio 140. Is searched in cooperation with the relay radio 110. The signal processing unit 150 controls the radio wave transmitting unit 162 and the radio wave receiving unit 164 so as to communicate with the relay radio 110 using the frequency band searched by the frequency band searching unit 152.
 周波数帯幅算出部156には、ユーザ設定入力部158からユーザ200が希望する伝送速度が入力される。周波数帯幅算出部156は、ユーザ200の希望する伝送速度を実現するための目標周波数帯幅を算出する。周波数帯探索部152で探索された周波数帯の中には目標周波数帯幅を満たす連続した広帯域の周波数帯がない場合、周波数帯幅算出部156は、複数の周波数帯を束ねてキャリアアグリゲーションを行う。 The transmission speed desired by the user 200 is input from the user setting input unit 158 to the frequency bandwidth calculation unit 156. The frequency bandwidth calculation unit 156 calculates a target frequency bandwidth for realizing the transmission speed desired by the user 200. When there is no continuous wide band frequency band satisfying the target frequency band width in the frequency band searched by the frequency band search unit 152, the frequency band width calculation unit 156 bundles a plurality of frequency bands and performs carrier aggregation. ..
 通信方式選択部154は、周波数帯探索部152で探索された周波数帯、或いは、周波数帯幅算出部156で束ねられた周波数帯を用いて中継無線機110との通信が開始される際、省電力で通信可能な通信方式を選択する。通信方式選択部154は、選択した通信方式で通信を行うように電波送信部162及び電波受信部164を制御する。 The communication method selection unit 154 saves time when communication with the relay radio 110 is started using the frequency band searched by the frequency band search unit 152 or the frequency band bundled by the frequency bandwidth calculation unit 156. Select a communication method that can communicate with power. The communication method selection unit 154 controls the radio wave transmission unit 162 and the radio wave reception unit 164 so that communication is performed by the selected communication method.
 以下、屋外無線機4との通信に係る中継無線機10の機能と、屋内無線機6との通信に係る中継無線機10の機能のそれぞれについて、フローチャートに基づいてより具体的に説明する。 Hereinafter, each of the function of the relay radio 10 related to the communication with the outdoor radio 4 and the function of the relay radio 10 related to the communication with the indoor radio 6 will be described more specifically based on the flowchart.
2-4.屋外通信に係る屋外無線機と中継無線機の機能の詳細
 屋外通信に係る屋外無線機140と中継無線機110の機能について、図9を用いてより具体的に説明する。図9は、本無線中継システム102において屋外無線機140と中継無線機110との間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。屋外無線機140と中継無線機110との間で通信を開始するに際し、使用する周波数帯が両者の間で決定される。図9には、屋外通信で使用する周波数帯を探索し、探索した周波数帯で通信を開始するまでの手順が示されている。
2-4. Details of Functions of Outdoor Radio and Relay Radio Related to Outdoor Communication The functions of the outdoor radio 140 and the relay radio 110 related to outdoor communication will be described more specifically with reference to FIG. FIG. 9 is a flowchart for explaining the contents of the process executed between the outdoor radio unit 140 and the relay radio unit 110 in the wireless relay system 102. When starting communication between the outdoor radio 140 and the relay radio 110, the frequency band to be used is determined between the two. FIG. 9 shows a procedure for searching for a frequency band used for outdoor communication and starting communication in the searched frequency band.
 まず、中継無線機110は、ユーザ200より屋外無線機140との伝送速度の指定を受け付ける(ステップS100)。屋外無線機140もまた、ユーザ200より中継無線機110との伝送速度の指定を受け付ける(ステップS120)。ただし、中継無線機110に対して指定される伝送速度と屋外無線機140に対して指定される伝送速度とは一致する必要がある。ゆえに、中継無線機110と屋外無線機140のどちらかに対して伝送速度が入力された場合、予め定めておいた周波数帯を用いて他方の無線機に対して伝送速度を通知するようにしてもよい。 First, the relay radio 110 accepts the designation of the transmission speed from the user 200 with the outdoor radio 140 (step S100). The outdoor radio 140 also accepts the designation of the transmission speed with the relay radio 110 from the user 200 (step S120). However, the transmission speed specified for the relay radio 110 and the transmission speed specified for the outdoor radio 140 need to match. Therefore, when the transmission speed is input to either the relay radio 110 or the outdoor radio 140, the transmission speed is notified to the other radio using a predetermined frequency band. May be good.
 次に、中継無線機110は、キャリアセンスにより、干渉や雑音が閾値以下の周波数帯G1を探索する(ステップS102)。屋外無線機140もまた、キャリアセンスにより、干渉や雑音が閾値以下の周波数帯G2を探索する(ステップS122)。具体的には、中継無線機110と屋外無線機140とは、通信を行っていない状態において受信モードを選択し、それぞれが使用可能な各周波数帯での受信電力を測定する。中継無線機110は、周波数帯毎に受信電力を閾値と比較し、受信電力が閾値以下になる周波数帯G1を探索する。屋外無線機140もまた、周波数帯毎に受信電力を閾値と比較し、受信電力が閾値以下になる周波数帯G2を探索する。ステップS102で用いられる閾値とステップS122で用いられる閾値とは必ずしも同じ値である必要はない。 Next, the relay radio 110 searches for the frequency band G1 in which interference and noise are equal to or less than the threshold value by carrier sense (step S102). The outdoor radio 140 also searches for the frequency band G2 in which interference and noise are below the threshold value by carrier sense (step S122). Specifically, the relay radio 110 and the outdoor radio 140 select a reception mode in a state where they are not communicating, and measure the reception power in each frequency band that can be used by each. The relay radio 110 compares the received power with the threshold value for each frequency band, and searches for the frequency band G1 in which the received power is equal to or less than the threshold value. The outdoor radio 140 also compares the received power with the threshold value for each frequency band, and searches for the frequency band G2 in which the received power is equal to or less than the threshold value. The threshold value used in step S102 and the threshold value used in step S122 do not necessarily have to be the same value.
 次に、中継無線機110は、周波数帯G1と周波数帯G2とが重なる周波数帯Gで屋外無線機140に電波を送信する(ステップS104)。屋外無線機140もまた、周波数帯Gで中継無線機110に電波を送信する(ステップS124)。周波数帯Gは、中継無線機110と屋外無線機140との両方から見て他の無線機において使用されていないと判断可能な周波数帯である。周波数帯Gは、本開示の第2の態様の無線中継用ソフトウェア無線機で探索される第1共通周波数帯に相当する。 Next, the relay radio 110 transmits radio waves to the outdoor radio 140 in the frequency band G where the frequency band G1 and the frequency band G2 overlap (step S104). The outdoor radio 140 also transmits radio waves to the relay radio 110 in the frequency band G (step S124). The frequency band G is a frequency band that can be determined not to be used in other radios when viewed from both the relay radio 110 and the outdoor radio 140. The frequency band G corresponds to the first common frequency band searched by the software defined radio for radio relay according to the second aspect of the present disclosure.
 中継無線機110は、屋外無線機140からの電波を受信し、受信した電波の受信レベルが相対的に高く、且つ当該電波のC/Nが閾値以上になる周波数帯H1を探索する(ステップS106)。屋外無線機140もまた、中継無線機110からの電波を受信し、受信した電波の受信レベルが相対的に高く、且つ当該電波のC/Nが閾値以上になる周波数帯H2を探索する(ステップS126)。ステップS106で用いられる閾値とステップS126で用いられる閾値とは必ずしも同じ値である必要はない。 The relay radio 110 receives radio waves from the outdoor radio 140, and searches for a frequency band H1 in which the reception level of the received radio waves is relatively high and the C / N of the radio waves is equal to or higher than the threshold value (step S106). ). The outdoor radio 140 also receives radio waves from the relay radio 110, and searches for a frequency band H2 in which the reception level of the received radio waves is relatively high and the C / N of the radio waves is equal to or higher than the threshold value (step). S126). The threshold value used in step S106 and the threshold value used in step S126 do not necessarily have to be the same value.
 次に、中継無線機110は、周波数帯H1と周波数帯H2とが重なる周波数帯Hで屋外無線機140に電波を送信する(ステップS108)。屋外無線機140もまた、周波数帯Hで中継無線機110に電波を送信する(ステップS128)。周波数帯Hは、周波数帯Gのうち、中継無線機110と屋外無線機140の双方において電波の受信レベルが相対的に高く且つ電波のC/Nが閾値以上になる周波数帯、すなわち、良好な通信品質を提供可能な周波数帯である。周波数帯Hは、本開示の第2の態様の無線中継用ソフトウェア無線機で探索される第2共通周波数帯に相当し、また、本開示の無線中継システム及び無線中継方法における屋外通信用周波数帯に相当する。屋外無線機140と中継無線機110とは、周波数帯Hで通信を開始する。 Next, the relay radio 110 transmits radio waves to the outdoor radio 140 in the frequency band H where the frequency band H1 and the frequency band H2 overlap (step S108). The outdoor radio 140 also transmits radio waves to the relay radio 110 in the frequency band H (step S128). The frequency band H is a frequency band in which the reception level of radio waves is relatively high and the C / N of radio waves is equal to or higher than the threshold value in both the relay radio 110 and the outdoor radio 140, that is, good. It is a frequency band that can provide communication quality. The frequency band H corresponds to the second common frequency band searched for by the software defined radio for wireless relay according to the second aspect of the present disclosure, and is also the frequency band for outdoor communication in the wireless relay system and the wireless relay method of the present disclosure. Corresponds to. The outdoor radio 140 and the relay radio 110 start communication in the frequency band H.
 周波数帯Hの単独使用ではステップS100及びステップS120で指定された伝送速度を実現できない場合、中継無線機110と屋外無線機140とは、キャリアアグリゲーションを行う(ステップS110、S130)。具体的には、周波数帯Hとして使用可能な周波数帯が複数ある場合に、中継無線機110と屋外無線機140とは、それら複数の周波数帯を束ねて使用する。ただし、キャリアアグリゲーションを行う周波数帯は、中継無線機110と屋外無線機140とで一致する必要がある。ゆえに、中継無線機110と屋外無線機140のどちらか一方でキャリアアグリゲーション対象の周波数帯を決定し、予め定めておいた周波数帯を用いて他方の無線機に対して対象周波数帯を通知するようにしてもよい。 When the transmission speed specified in steps S100 and S120 cannot be realized by using the frequency band H alone, the relay radio 110 and the outdoor radio 140 perform carrier aggregation (steps S110 and S130). Specifically, when there are a plurality of frequency bands that can be used as the frequency band H, the relay radio 110 and the outdoor radio 140 are used by bundling the plurality of frequency bands. However, the frequency band for carrier aggregation needs to match between the relay radio 110 and the outdoor radio 140. Therefore, the frequency band to be carrier-aggregated is determined for either the relay radio 110 or the outdoor radio 140, and the target frequency band is notified to the other radio using a predetermined frequency band. You may do it.
2-5.屋内通信に係る屋内無線機と中継無線機の機能の詳細
 屋内通信に係る屋内無線機170と中継無線機110の機能について、図10を用いてより具体的に説明する。図10は、本無線中継システム102において屋内無線機170と中継無線機110との間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。屋内無線機170と中継無線機110との間で通信を開始するに際し、使用する周波数帯が両者の間で決定される。ただし、屋内無線機170が複数設置されている場合、屋内無線機170毎に図10に示す手順に従って使用する周波数帯が決定される。図10には、屋内通信で使用する周波数帯を探索し、探索した周波数帯で通信を開始するまでの手順が示されている。
2-5. Details of Functions of Indoor Radio and Relay Radio Related to Indoor Communication The functions of the indoor radio 170 and relay radio 110 related to indoor communication will be described more specifically with reference to FIG. FIG. 10 is a flowchart for explaining the contents of the process executed between the indoor radio unit 170 and the relay radio unit 110 in the wireless relay system 102. When starting communication between the indoor radio 170 and the relay radio 110, the frequency band to be used is determined between the two. However, when a plurality of indoor radios 170 are installed, the frequency band to be used is determined for each indoor radio 170 according to the procedure shown in FIG. FIG. 10 shows a procedure for searching for a frequency band used for indoor communication and starting communication in the searched frequency band.
 まず、中継無線機110は、ユーザ200より屋内無線機170との伝送速度の指定を受け付ける(ステップS140)。屋内無線機170もまた、ユーザ200より中継無線機110との伝送速度の指定を受け付ける(ステップS160)。ただし、中継無線機110と屋内無線機170のどちらかに対して伝送速度が入力された場合、予め定めておいた周波数帯を用いて他方の無線機に対して伝送速度を通知するようにしてもよい。 First, the relay radio 110 accepts the designation of the transmission speed from the user 200 with the indoor radio 170 (step S140). The indoor radio 170 also accepts the designation of the transmission speed with the relay radio 110 from the user 200 (step S160). However, when the transmission speed is input to either the relay radio 110 or the indoor radio 170, the transmission speed is notified to the other radio using a predetermined frequency band. May be good.
 次に、中継無線機110は、キャリアセンスにより、干渉や雑音が閾値以下の周波数帯J1を探索する(ステップS142)。屋内無線機170もまた、キャリアセンスにより、干渉や雑音が閾値以下の周波数帯J2を探索する(ステップS162)。具体的には、中継無線機110と屋内無線機170とは、通信を行っていない状態において受信モードを選択し、それぞれが使用可能な各周波数帯での受信電力を測定する。中継無線機110は、周波数帯毎に受信電力を閾値と比較し、受信電力が閾値以下になる周波数帯J1を探索する。屋内無線機170もまた、周波数帯毎に受信電力を閾値と比較し、受信電力が閾値以下になる周波数帯J2を探索する。ステップS142で用いられる閾値とステップS162で用いられる閾値とは必ずしも同じ値である必要はない。 Next, the relay radio 110 searches for the frequency band J1 in which interference and noise are equal to or less than the threshold value by carrier sense (step S142). The indoor radio 170 also searches for the frequency band J2 in which interference and noise are below the threshold value by carrier sense (step S162). Specifically, the relay radio 110 and the indoor radio 170 select a reception mode in a state where they are not communicating, and measure the reception power in each frequency band that can be used by each. The relay radio 110 compares the received power with the threshold value for each frequency band, and searches for the frequency band J1 in which the received power is equal to or less than the threshold value. The indoor radio 170 also compares the received power with the threshold value for each frequency band, and searches for the frequency band J2 in which the received power is equal to or less than the threshold value. The threshold value used in step S142 and the threshold value used in step S162 do not necessarily have to be the same value.
 次に、中継無線機110は、周波数帯J1と周波数帯J2とが重なる周波数帯Jで屋内無線機170に電波を送信する(ステップS144)。屋内無線機170もまた、周波数帯Jで中継無線機110に電波を送信する(ステップS164)。周波数帯Jは、本開示の第2の態様の無線中継用ソフトウェア無線機で探索される第3共通周波数帯に相当する。 Next, the relay radio 110 transmits radio waves to the indoor radio 170 in the frequency band J where the frequency band J1 and the frequency band J2 overlap (step S144). The indoor radio 170 also transmits radio waves to the relay radio 110 in the frequency band J (step S164). The frequency band J corresponds to the third common frequency band searched by the software defined radio for radio relay according to the second aspect of the present disclosure.
 中継無線機110は、屋内無線機170からの電波を受信し、受信した電波の受信レベルが相対的に高く、且つ当該電波のC/Nが閾値以上になる周波数帯K1を探索する(ステップS146)。屋内無線機170もまた、中継無線機110からの電波を受信し、受信した電波の受信レベルが相対的に高く、且つ当該電波のC/Nが閾値以上になる周波数帯K2を探索する(ステップS166)。ステップS146で用いられる閾値とステップS166で用いられる閾値とは必ずしも同じ値である必要はない。 The relay radio 110 receives the radio wave from the indoor radio 170, and searches for a frequency band K1 in which the reception level of the received radio wave is relatively high and the C / N of the radio wave is equal to or higher than the threshold value (step S146). ). The indoor radio 170 also receives radio waves from the relay radio 110, and searches for a frequency band K2 in which the reception level of the received radio waves is relatively high and the C / N of the radio waves is equal to or higher than the threshold value (step). S166). The threshold value used in step S146 and the threshold value used in step S166 do not necessarily have to be the same value.
 次に、中継無線機110は、周波数帯K1と周波数帯K2とが重なる周波数帯Kで屋内無線機170に電波を送信する(ステップS148)。屋内無線機170もまた、周波数帯Kで中継無線機110に電波を送信する(ステップS168)。周波数帯Kは、周波数帯Jのうち、中継無線機110と屋内無線機170の双方において電波の受信レベルが相対的に高く且つ電波のC/Nが閾値以上になる周波数帯、すなわち、良好な通信品質を提供可能な周波数帯である。周波数帯Kは、本開示の第2の態様の無線中継用ソフトウェア無線機で探索される第4共通周波数帯に相当し、また、本開示の無線中継システム及び無線中継方法における屋内通信用周波数帯に相当する。屋内無線機170と中継無線機110とは、周波数帯Kで通信を開始する。 Next, the relay radio 110 transmits radio waves to the indoor radio 170 in the frequency band K where the frequency band K1 and the frequency band K2 overlap (step S148). The indoor radio 170 also transmits radio waves to the relay radio 110 in the frequency band K (step S168). Of the frequency bands J, the frequency band K is a frequency band in which the reception level of radio waves is relatively high in both the relay radio 110 and the indoor radio 170 and the C / N of the radio waves is equal to or higher than the threshold value, that is, good. It is a frequency band that can provide communication quality. The frequency band K corresponds to the fourth common frequency band searched for by the software defined radio for wireless relay according to the second aspect of the present disclosure, and is also the frequency band for indoor communication in the wireless relay system and the wireless relay method of the present disclosure. Corresponds to. The indoor radio 170 and the relay radio 110 start communication in the frequency band K.
 周波数帯Kの単独使用ではステップS140及びステップS160で指定された伝送速度を実現できない場合、中継無線機110と屋内無線機170とは、キャリアアグリゲーションを行う(ステップS150、S170)。具体的には、周波数帯Kとして使用可能な周波数帯が複数ある場合に、中継無線機110と屋内無線機170とは、それら複数の周波数帯を束ねて使用する。ただし、中継無線機110と屋内無線機170のどちらか一方でキャリアアグリゲーション対象の周波数帯を決定し、予め定めておいた周波数帯を用いて他方の無線機に対して対象周波数帯を通知するようにしてもよい。 If the transmission speed specified in steps S140 and S160 cannot be achieved by using the frequency band K alone, the relay radio 110 and the indoor radio 170 perform carrier aggregation (steps S150 and S170). Specifically, when there are a plurality of frequency bands that can be used as the frequency band K, the relay radio 110 and the indoor radio 170 are used by bundling the plurality of frequency bands. However, the frequency band to be carrier-aggregated is determined for either the relay radio 110 or the indoor radio 170, and the target frequency band is notified to the other radio using a predetermined frequency band. You may do it.
2-6.効果
 以上の手順で屋外無線機140と中継無線機110との間の通信が行われ、且つ、屋内無線機170と中継無線機110との間の通信が行われることで、通信環境が通信品質に与える影響を低減し、良好な通信品質で無線中継を行うことが可能となる。さらに、キャリアアグリゲーションが行われることで、ユーザ200が希望する伝送速度を実現することができる。
2-6. Effect By the above procedure, the communication between the outdoor radio 140 and the relay radio 110 is performed, and the communication between the indoor radio 170 and the relay radio 110 is performed, so that the communication environment is improved in communication quality. It is possible to perform wireless relay with good communication quality by reducing the influence on. Further, by performing carrier aggregation, the transmission speed desired by the user 200 can be realized.
3.その他
 以上説明した第1実施形態と第2実施形態は、本開示の要旨を逸脱しない範囲で種々に変形して実施することができる。すなわち、上記実施形態において各要素の個数、数量、量、範囲などの数に言及されている場合、特に明示した場合や原理的に明らかにその数に特定される場合を除いて、その言及した数に、本開示に係る技術が限定されるものではない。また、上記実施形態において説明する構造やステップなどは、特に明示した場合や明らかに原理的にそれに特定される場合を除いて、本開示に係る技術に必ずしも必須のものではない。
3. 3. Others The first embodiment and the second embodiment described above can be variously modified and implemented without departing from the gist of the present disclosure. That is, when the number, quantity, quantity, range, etc. of each element is mentioned in the above embodiment, the reference is made unless it is explicitly stated or when the number is clearly specified in principle. The number is not limited to the technology according to the present disclosure. In addition, the structures and steps described in the above embodiments are not necessarily essential to the technique according to the present disclosure, except when explicitly stated or clearly specified in principle.
2、102 無線中継システム
4、140 屋外無線機
6、170 屋内無線機
8 家屋の境界面
10、110 中継無線機(無線中継用ソフトウェア無線機)
20、120 信号処理部
32 屋外通信用の電波送信部
34 屋外通信用の電波受信部
36 屋内通信用の電波送信部
38 屋内通信用の電波受信部
2,102 Wireless relay system 4,140 Outdoor radio 6,170 Indoor radio 8 House boundary surface 10,110 Relay radio (software defined radio for wireless relay)
20, 120 Signal processing unit 32 Radio wave transmission unit for outdoor communication 34 Radio wave reception unit for outdoor communication 36 Radio wave transmission unit for indoor communication 38 Radio wave reception unit for indoor communication

Claims (8)

  1.  屋外無線機と屋内無線機とそれらを中継する中継無線機とを備える無線中継システムであって、
     前記中継無線機はソフトウェア無線機として構成され、
     前記屋外無線機と前記屋内無線機とは複数の周波数帯の中から使用する周波数帯を選択可能に構成され、
     前記中継無線機と前記屋外無線機とは、協働により、
      前記中継無線機と前記屋外無線機とが通信していない状態で検知される干渉及び雑音が閾値以下であり、前記中継無線機と前記屋外無線機との少なくとも一方で受信される通信相手からの電波の受信レベルが相対的に高く、且つ当該電波のC/Nが閾値以上になる屋外通信用周波数帯を探索する屋外通信準備処理と、
      前記屋外通信準備処理で探索された前記屋外通信用周波数帯を用いて前記中継無線機と前記屋外無線機との通信を開始する屋外通信開始処理と、を実行し、
     前記中継無線機と前記屋内無線機とは、協働により、
      前記中継無線機と前記屋内無線機とが通信していない状態で検知される干渉及び雑音が閾値以下であり、前記中継無線機と前記屋内無線機との少なくとも一方で受信される通信相手からの電波の受信レベルが相対的に高く、且つ当該電波のC/Nが閾値以上になる屋内通信用周波数帯を探索する屋内通信準備処理と、
      前記屋内通信準備処理で探索された前記屋内通信用周波数帯を用いて前記中継無線機と前記屋内無線機との通信を開始する屋内通信開始処理と、を実行する
    ことを特徴とする無線中継システム。
    It is a radio relay system including an outdoor radio, an indoor radio, and a relay radio that relays them.
    The relay radio is configured as a software defined radio.
    The outdoor radio and the indoor radio are configured so that the frequency band to be used can be selected from a plurality of frequency bands.
    The relay radio and the outdoor radio collaborate with each other.
    The interference and noise detected when the relay radio wave and the outdoor radio wave are not communicating are equal to or less than the threshold value, and the communication partner receives at least one of the relay radio wave and the outdoor radio wave. Outdoor communication preparation processing to search for an outdoor communication frequency band where the reception level of radio waves is relatively high and the C / N of the radio waves is equal to or higher than the threshold value.
    The outdoor communication start processing for starting the communication between the relay radio and the outdoor radio using the outdoor communication frequency band searched in the outdoor communication preparation process is executed.
    The relay radio and the indoor radio collaborate with each other.
    The interference and noise detected when the relay radio wave and the indoor radio wave are not communicating are equal to or less than the threshold value, and the communication partner receives at least one of the relay radio wave and the indoor radio wave. Indoor communication preparation processing to search for an indoor communication frequency band where the reception level of radio waves is relatively high and the C / N of the radio waves is equal to or higher than the threshold value.
    A wireless relay system characterized by executing an indoor communication start process for initiating communication between the relay radio device and the indoor radio device using the indoor communication frequency band searched in the indoor communication preparation process. ..
  2.  前記中継無線機は、
     前記屋外通信準備処理では、
      前記屋外無線機と通信していない状態において検知される干渉及び雑音が閾値以下になる第1周波数帯をキャリアセンスにより探索し、
      前記屋外無線機から送信される電波に基づき、受信レベルが相対的に高く且つC/Nが閾値以上になる第2周波数帯を探索し、
      前記第1周波数帯と前記第2周波数帯とが重なる周波数帯を前記屋外通信用周波数帯として決定し、
      決定した前記屋外通信用周波数帯を前記屋外無線機に通知し、
     前記屋内通信準備処理では、
      前記屋内無線機と通信していない状態において検知される干渉及び雑音が閾値以下になる第3周波数帯をキャリアセンスにより探索し、
      前記屋内無線機から送信される電波に基づき、受信レベルが相対的に高く且つC/Nが閾値以上になる第4周波数帯を探索し、
      前記第3周波数帯と前記第4周波数帯とが重なる周波数帯を前記屋内通信用周波数帯として決定し、
      決定した前記屋内通信用周波数帯を前記屋内無線機に通知する
    ことを特徴とする請求項1に記載の無線中継システム。
    The relay radio is
    In the outdoor communication preparation process,
    The carrier sense searches for the first frequency band in which the interference and noise detected in the state of not communicating with the outdoor radio are equal to or less than the threshold value.
    Based on the radio wave transmitted from the outdoor radio, a second frequency band having a relatively high reception level and a C / N equal to or higher than the threshold value is searched for.
    A frequency band in which the first frequency band and the second frequency band overlap is determined as the outdoor communication frequency band.
    Notify the outdoor radio of the determined frequency band for outdoor communication, and
    In the indoor communication preparation process,
    A third frequency band in which the interference and noise detected in the state of not communicating with the indoor radio is equal to or less than the threshold value is searched for by carrier sense.
    Based on the radio wave transmitted from the indoor radio, the fourth frequency band in which the reception level is relatively high and the C / N is equal to or higher than the threshold value is searched for.
    A frequency band in which the third frequency band and the fourth frequency band overlap is determined as the indoor communication frequency band.
    The wireless relay system according to claim 1, wherein the determined indoor communication frequency band is notified to the indoor radio.
  3.  前記屋外無線機と前記屋内無線機とはそれぞれソフトウェア無線機として構成され、
     前記中継無線機と前記屋外無線機とは、
     前記屋外通信準備処理では、
      前記中継無線機と前記屋外無線機とが通信していない状態において、前記中継無線機と前記屋外無線機の双方において検知される干渉及び雑音が閾値以下になる第1共通周波数帯をキャリアセンスにより探索し、
      前記第1共通周波数帯のうち、前記中継無線機と前記屋外無線機の双方において受信レベルが相対的に高く且つC/Nが閾値以上になる第2共通周波数帯を協働して探索し、
      前記第2共通周波数帯を前記屋外通信用周波数帯として決定し、
     前記中継無線機と前記屋内無線機とは、
     前記屋内通信準備処理では、
      前記中継無線機と前記屋内無線機とが通信していない状態において、前記中継無線機と前記屋内無線機の双方において検知される干渉及び雑音が閾値以下になる第3共通周波数帯をキャリアセンスにより探索し、
      前記第3共通周波数帯のうち、前記中継無線機と前記屋内無線機の双方において受信レベルが相対的に高く且つC/Nが閾値以上になる第4共通周波数帯を協働して探索し、
      前記第4共通周波数帯を前記屋内通信用周波数帯として決定する
    ことを特徴とする請求項1に記載の無線中継システム。
    The outdoor radio and the indoor radio are configured as software defined radios, respectively.
    The relay radio and the outdoor radio are
    In the outdoor communication preparation process,
    When the relay radio and the outdoor radio are not communicating with each other, the carrier sense determines the first common frequency band in which the interference and noise detected by both the relay radio and the outdoor radio are equal to or less than the threshold value. Explore and
    Of the first common frequency band, the second common frequency band in which the reception level is relatively high and the C / N is equal to or higher than the threshold value in both the relay radio and the outdoor radio is jointly searched.
    The second common frequency band is determined as the outdoor communication frequency band, and the frequency band is determined.
    The relay radio and the indoor radio
    In the indoor communication preparation process,
    In a state where the relay radio and the indoor radio are not communicating, a third common frequency band in which the interference and noise detected by both the relay radio and the indoor radio are equal to or less than the threshold value is determined by carrier sense. Explore and
    Of the third common frequency band, the fourth common frequency band in which the reception level is relatively high and the C / N is equal to or higher than the threshold value in both the relay radio and the indoor radio is jointly searched.
    The wireless relay system according to claim 1, wherein the fourth common frequency band is determined as the indoor communication frequency band.
  4.  前記中継無線機と前記屋外無線機とは、
     前記屋外通信開始処理において、
      指定伝送速度を満たす連続した周波数帯を前記屋外通信用周波数帯として確保できない場合、前記屋外通信用周波数帯として使用可能な複数の周波数帯を束ねてキャリアアグリゲーションを行い、
     前記中継無線機と前記屋内無線機とは、
     前記屋内通信開始処理において、
      前記指定伝送速度を満たす連続した周波数帯を前記屋内通信用周波数帯として確保できない場合、前記屋内通信用周波数帯として使用可能な複数の周波数帯を束ねてキャリアアグリゲーションを行う
    ことを特徴とする請求項3に記載の無線中継システム。
    The relay radio and the outdoor radio are
    In the outdoor communication start processing
    When a continuous frequency band satisfying the specified transmission speed cannot be secured as the outdoor communication frequency band, a plurality of frequency bands that can be used as the outdoor communication frequency band are bundled and carrier aggregation is performed.
    The relay radio and the indoor radio
    In the indoor communication start process
    The present invention is characterized in that when a continuous frequency band satisfying the designated transmission speed cannot be secured as the indoor communication frequency band, carrier aggregation is performed by bundling a plurality of frequency bands that can be used as the indoor communication frequency band. The wireless relay system according to 3.
  5.  屋外無線機と屋内無線機とを中継無線機によって中継する無線中継方法であって、
     前記中継無線機はソフトウェア無線機であり、
     前記屋外無線機と前記屋内無線機とは複数の周波数帯の中から使用する周波数帯を選択可能であり、
     前記中継無線機と前記屋外無線機との間で通信を行う屋外通信ステップと、
     前記中継無線機と前記屋内無線機との間で通信を行う屋内通信ステップと、を含み、
     前記屋外通信ステップは、
      前記中継無線機と前記屋外無線機とが通信していない状態で検知される干渉及び雑音が閾値以下であり、前記中継無線機と前記屋外無線機との少なくとも一方で受信される通信相手からの電波の受信レベルが相対的に高く、且つ当該電波のC/Nが閾値以上になる屋外通信用周波数帯を探索するステップと、
      探索された前記屋外通信用周波数帯を用いて前記中継無線機と前記屋外無線機との間で通信を開始するステップと、を含み、
     前記屋内通信ステップは、
      前記中継無線機と前記屋内無線機とが通信していない状態で検知される干渉及び雑音が閾値以下であり、前記中継無線機と前記屋内無線機との少なくとも一方で受信される通信相手からの電波の受信レベルが相対的に高く、且つ当該電波のC/Nが閾値以上になる屋内通信用周波数帯を探索するステップと、
      探索された前記屋内通信用周波数帯を用いて前記中継無線機と前記屋内無線機との間で通信を開始するステップと、を含む
    ことを特徴とする無線中継方法。
    It is a wireless relay method in which an outdoor radio and an indoor radio are relayed by a relay radio.
    The relay radio is a software defined radio.
    The frequency band to be used can be selected from a plurality of frequency bands for the outdoor radio and the indoor radio.
    An outdoor communication step for communicating between the relay radio and the outdoor radio,
    Including an indoor communication step of communicating between the relay radio and the indoor radio.
    The outdoor communication step is
    The interference and noise detected when the relay radio wave and the outdoor radio wave are not communicating are equal to or less than the threshold value, and the communication partner receives at least one of the relay radio wave and the outdoor radio wave. A step of searching for an outdoor communication frequency band in which the reception level of radio waves is relatively high and the C / N of the radio waves is equal to or higher than the threshold value.
    Including a step of initiating communication between the relay radio and the outdoor radio using the searched frequency band for outdoor communication.
    The indoor communication step is
    The interference and noise detected when the relay radio wave and the indoor radio wave are not communicating are equal to or less than the threshold value, and the communication partner receives at least one of the relay radio wave and the indoor radio wave. A step of searching for an indoor communication frequency band in which the reception level of radio waves is relatively high and the C / N of the radio waves is equal to or higher than the threshold value.
    A radio relay method comprising: a step of initiating communication between the relay radio and the indoor radio using the searched frequency band for indoor communication.
  6.  複数の周波数帯の中から使用する周波数帯を選択可能に構成された屋外無線機及び屋内無線機を中継する無線中継用ソフトウェア無線機であって、
     前記屋外無線機と通信する屋外通信用送受信部と、
     前記屋内無線機と通信する屋内通信用送受信部と、
     前記屋外無線機との通信に使用する周波数帯の変更と前記屋内無線機との通信に使用する周波数帯の変更とを行うソフトウェアが動作する信号処理部と、を備え、
     前記信号処理部は、
     前記屋外無線機と通信する場合、
      前記屋外無線機と通信していない状態において検知される干渉及び雑音が閾値以下になる第1周波数帯をキャリアセンスにより探索する処理と、
      前記屋外無線機から送信される電波に基づき、受信レベルが相対的に高く且つC/Nが閾値以上になる第2周波数帯を探索する処理と、
      前記第1周波数帯と前記第2周波数帯とが重なる周波数帯を用いて前記屋外無線機と通信するように前記屋外通信用送受信部を制御する処理と、を実行し、
     前記屋内無線機と通信する場合、
      前記屋内無線機と通信していない状態において検知される干渉及び雑音が閾値以下になる第3周波数帯をキャリアセンスにより探索する処理と、
      前記屋内無線機から送信される電波に基づき、受信レベルが相対的に高く且つC/Nが閾値以上になる第4周波数帯を探索する処理と、
      前記第3周波数帯と前記第4周波数帯とが重なる周波数帯を用いて前記屋内無線機と通信するように前記屋内通信用送受信部を制御する処理と、を実行する、
    ことを特徴とする無線中継用ソフトウェア無線機。
    It is a software defined radio for radio relay that relays outdoor radios and indoor radios configured so that the frequency band to be used can be selected from a plurality of frequency bands.
    An outdoor communication transceiver that communicates with the outdoor radio,
    An indoor communication transceiver that communicates with the indoor radio,
    A signal processing unit for operating software that changes the frequency band used for communication with the outdoor radio and the frequency band used for communication with the indoor radio is provided.
    The signal processing unit
    When communicating with the outdoor radio
    A process of searching for a first frequency band in which interference and noise detected in a state of not communicating with the outdoor radio are equal to or less than a threshold value by carrier sense, and
    A process of searching for a second frequency band in which the reception level is relatively high and the C / N is equal to or higher than the threshold value based on the radio wave transmitted from the outdoor radio.
    The process of controlling the transmission / reception unit for outdoor communication so as to communicate with the outdoor radio using the frequency band in which the first frequency band and the second frequency band overlap is executed.
    When communicating with the indoor radio
    A process of searching for a third frequency band in which interference and noise detected in a state of not communicating with the indoor radio are equal to or less than a threshold value by carrier sense, and
    A process of searching for a fourth frequency band in which the reception level is relatively high and the C / N is equal to or higher than the threshold value based on the radio waves transmitted from the indoor radio.
    A process of controlling the indoor communication transmission / reception unit so as to communicate with the indoor radio using the frequency band in which the third frequency band and the fourth frequency band overlap is executed.
    A software defined radio for wireless relay.
  7.  ソフトウェア無線を利用する屋外無線機及び屋内無線機を中継する無線中継用ソフトウェア無線機であって、
     前記屋外無線機と通信する屋外通信用送受信部と、
     前記屋内無線機と通信する屋内通信用送受信部と、
     前記屋外無線機との通信に使用する周波数帯の変更と前記屋内無線機との通信に使用する周波数帯の変更とを行うソフトウェアが動作する信号処理部と、を備え、
     前記信号処理部は、
     前記屋外無線機と通信する場合、
      前記屋外無線機と通信していない状態において、前記無線中継用ソフトウェア無線機と前記屋外無線機の双方において検知される干渉及び雑音が閾値以下になる第1共通周波数帯を前記屋外無線機と協働してキャリアセンスにより探索する処理と、
      探索された前記第1共通周波数帯のうち、前記無線中継用ソフトウェア無線機と前記屋外無線機の双方において受信レベルが相対的に高く且つC/Nが閾値以上になる第2共通周波数帯を前記屋外無線機との協働により探索する処理と、
      探索された前記第2共通周波数帯を用いて前記屋外無線機と通信するように前記屋外通信用送受信部を制御する処理と、を実行し、
     前記屋内無線機と通信する場合、
      前記屋内無線機と通信していない状態において、前記無線中継用ソフトウェア無線機と前記屋内無線機の双方において検知される干渉及び雑音が閾値以下になる第3共通周波数帯を前記屋内無線機と協働してキャリアセンスにより探索する処理と、
      探索された前記第3共通周波数帯のうち、前記無線中継用ソフトウェア無線機と前記屋内無線機の双方において受信レベルが相対的に高く且つC/Nが閾値以上になる第4共通周波数帯を前記屋内無線機との協働により探索する処理と、
      探索された前記第4共通周波数帯を用いて前記屋内無線機と通信するように前記屋内通信用送受信部を制御する処理と、を実行する、
    ことを特徴とする無線中継用ソフトウェア無線機。
    An outdoor radio device that uses software defined radio and a software defined radio device for wireless relay that relays indoor radio devices.
    An outdoor communication transceiver that communicates with the outdoor radio,
    An indoor communication transceiver that communicates with the indoor radio,
    A signal processing unit for operating software that changes the frequency band used for communication with the outdoor radio and the frequency band used for communication with the indoor radio is provided.
    The signal processing unit
    When communicating with the outdoor radio
    In a state of not communicating with the outdoor radio, the first common frequency band in which the interference and noise detected by both the wireless relay software defined radio and the outdoor radio are equal to or less than the threshold value is cooperated with the outdoor radio. The process of working and searching by carrier sense,
    Among the searched first common frequency bands, the second common frequency band in which the reception level is relatively high and the C / N is equal to or higher than the threshold value in both the wireless relay software defined radio and the outdoor radio is defined as the second common frequency band. The process of searching in collaboration with an outdoor radio and
    The process of controlling the outdoor communication transmission / reception unit so as to communicate with the outdoor radio using the searched second common frequency band is executed.
    When communicating with the indoor radio
    In a state where communication is not performed with the indoor radio, a third common frequency band in which interference and noise detected by both the wireless relay software defined radio and the indoor radio are equal to or less than the threshold value is cooperated with the indoor radio. The process of working and searching by carrier sense,
    Among the searched third common frequency bands, the fourth common frequency band in which the reception level is relatively high and the C / N is equal to or higher than the threshold value in both the wireless relay software defined radio and the indoor radio is described above. The process of searching in collaboration with an indoor radio and
    A process of controlling the indoor communication transmission / reception unit so as to communicate with the indoor radio using the searched fourth common frequency band is executed.
    A software defined radio for wireless relay.
  8.  コンピュータに、請求項6又は7の無線中継用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
    ことを特徴とする無線中継用プログラム。
    A program for wireless relay, comprising a program for realizing the function of the software defined radio for wireless relay according to claim 6 or 7.
PCT/JP2020/036696 2020-09-28 2020-09-28 Radio relay system, radio relay method, software radio machine for radio relay, and radio relay program WO2022064709A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005277753A (en) * 2004-03-24 2005-10-06 Oki Electric Ind Co Ltd Wireless communication system, base station, and communication terminal
JP2010177854A (en) * 2009-01-28 2010-08-12 Nippon Telegr & Teleph Corp <Ntt> Radio communication system, radio relay device and radio relay method
JP2013175940A (en) * 2012-02-24 2013-09-05 Advanced Telecommunication Research Institute International Communication device, communication method and program

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005277753A (en) * 2004-03-24 2005-10-06 Oki Electric Ind Co Ltd Wireless communication system, base station, and communication terminal
JP2010177854A (en) * 2009-01-28 2010-08-12 Nippon Telegr & Teleph Corp <Ntt> Radio communication system, radio relay device and radio relay method
JP2013175940A (en) * 2012-02-24 2013-09-05 Advanced Telecommunication Research Institute International Communication device, communication method and program

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