WO2015008442A1 - ポイントツーポイント無線システム、通信装置、及び通信制御方法 - Google Patents
ポイントツーポイント無線システム、通信装置、及び通信制御方法 Download PDFInfo
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- WO2015008442A1 WO2015008442A1 PCT/JP2014/003520 JP2014003520W WO2015008442A1 WO 2015008442 A1 WO2015008442 A1 WO 2015008442A1 JP 2014003520 W JP2014003520 W JP 2014003520W WO 2015008442 A1 WO2015008442 A1 WO 2015008442A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
- H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/005—Damping of vibrations; Means for reducing wind-induced forces
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/11—Monitoring; Testing of transmitters for calibration
- H04B17/12—Monitoring; Testing of transmitters for calibration of transmit antennas, e.g. of the amplitude or phase
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/21—Monitoring; Testing of receivers for calibration; for correcting measurements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
Definitions
- This application relates to adaptive adjustment of modulation scheme and coding rate in a point-to-point wireless system.
- a point-to-point wireless system using microwaves or millimeter waves is known (see, for example, Patent Document 1).
- two communication devices perform digital communication via a point-to-point wireless link.
- each communication device includes a directional antenna and directs a directional beam toward the opposite device. Thereby, a point-to-point wireless link is established between the two communication devices.
- the communication quality of the point-to-point wireless link depends on weather conditions (for example, rain, fog, haze). Rain, fog, haze, or the like is for worsening the visibility between the two communication devices and attenuating radio signals (eg, microwaves or millimeter waves). For this reason, in a point-to-point wireless system, the communication quality of a point-to-point wireless link (for example, received signal strength (Received Signal Strength Indicator (RSSI)), Signal to Noise Ratio (SNR), or Bit Error Rate (BER)) Based on the above, an adaptive process for adaptively adjusting a modulation scheme, a code rate, and the like is performed.
- RSSI Receiveived Signal Strength Indicator
- SNR Signal to Noise Ratio
- BER Bit Error Rate
- the point-to-point wireless system is used for mobile backhaul, for example.
- the mobile backhaul means a line for connecting a base station of the cellular communication system to the core network and a line for connecting the base stations.
- the use of a point-to-point wireless system has advantages in terms of ease of network construction, high economic efficiency, and relaxation of restrictions on the location of a base station, compared to wired connection using optical fibers.
- a small cell having a coverage of about several tens to several hundreds of meters is used mainly for the purpose of increasing communication capacity in a city area, improving communication speed, and improving a coverage hole.
- Small cells are sometimes called picocells or femtocells.
- Small cell base stations may be installed in places closer to the street level than macro cell base stations, for example, lampposts and bus shelters.
- the point-to-point wireless communication device is also installed in a lamppost, a bus waiting area, and the like, like the small cell base station.
- lampposts and bus shelters are easily deformed by external forces such as wind, subway vibrations, and earthquakes, and are easily mechanically vibrated. This mechanical vibration may not be a major problem for small cell base stations.
- a point-to-point wireless communication apparatus communicates a directional beam toward an opposite apparatus, there is a possibility that the communication quality is greatly deteriorated due to fluctuation of the antenna direction due to mechanical vibration.
- the present invention has been made on the basis of the above-mentioned knowledge by the present inventor, and indicates that the communication quality of a radio link is deteriorated due to mechanical vibration of a structure to which a point-to-point radio communication device is attached.
- An object is to provide a point-to-point wireless system, a communication device, a communication control method, and a program that can be suppressed.
- the point-to-point wireless system includes first and second communication devices and a control unit.
- the first and second communication devices are respectively connected to first and second antennas attached to the first and second structures, respectively, and are configured to communicate with the first and second antennas, respectively.
- the control unit is configured to adjust a wireless communication parameter applied to the communication based on a quality index related to mechanical vibration of at least one of the first or second structures. ing.
- a communication device that communicates by point-to-point wireless communication includes an antenna, a communication unit, and a control unit.
- the communication unit is connected to the antenna attached to a structure.
- the control unit is configured to adjust a wireless communication parameter applied to the communication based on a quality index related to mechanical vibration of the structure.
- a communication control method for performing communication by point-to-point wireless communication includes performing communication using an antenna attached to a structure, and setting a wireless communication parameter applied to the communication to mechanical vibration of the structure. Based on the control.
- the program includes a group of instructions for causing a computer to perform the method according to the third aspect described above.
- the point-to-point wireless system includes first and second communication devices and a control unit.
- the first and second communication devices are respectively connected to first and second antennas attached to the first and second structures, respectively, and are configured to communicate with the first and second antennas, respectively.
- the control unit includes a wireless communication parameter applied to the communication, a first quality indicator related to a propagation characteristic of a wireless link, and a machine of at least one structure of the first or second structure. And adjusting based on a second quality indicator related to dynamic vibration.
- a communication device that communicates by point-to-point wireless communication includes a communication unit and a control unit.
- the communication unit is connected to an antenna attached to the structure.
- the control unit is configured to determine a radio communication parameter applied to the communication based on a first quality index related to a propagation characteristic of a radio link and a second quality index related to mechanical vibration of the structure. Configured to adjust.
- a communication control method for performing communication by point-to-point wireless communication performs communication using an antenna attached to a structure, and sets a wireless communication parameter applied to the communication as a propagation characteristic of a wireless link. Adjusting based on a first relevant quality indicator and a second indicator relating to mechanical vibrations of the structure.
- the program includes a group of instructions for causing a computer to perform the method according to the seventh aspect described above.
- the point-to-point wireless system, the communication apparatus, and the communication capable of suppressing the deterioration of the communication quality of the wireless link due to the mechanical vibration of the structure to which the point-to-point wireless communication apparatus is attached.
- a control method and a program can be provided.
- FIG. 1 is a block diagram illustrating a configuration example of a point-to-point wireless system according to a first embodiment. It is a figure which shows the mechanical vibration of the structure to which the antenna of a point-to-point radio
- FIG. 1 shows a configuration example of a point-to-point wireless system according to the present embodiment.
- the point-to-point wireless system of this embodiment includes communication devices 1 and 2.
- the communication devices 1 and 2 have antennas 10 and 20, respectively.
- the antennas 10 and 20 are directional antennas.
- the communication apparatuses 1 and 2 establish a point-to-point wireless link 50 between the antennas 10 and 20 by directing directional beams toward each other, and transmit a signal in at least one direction between each other via the wireless link 50.
- the communication devices 1 and 2 have transceivers (transceivers) 11 and 21, respectively, and transmit signals bidirectionally via a wireless link 50.
- the communication devices 1 and 2 further have controllers 12 and 22, respectively.
- Each of the controllers 12 and 22 performs an adaptation process to maintain the communication quality (eg, received signal strength, SNR, or BER) of the point-to-point wireless link 50.
- Controllers 12 and 22 may use modulation schemes, code rates, etc. to deal with changes in propagation conditions due to weather conditions (eg, rain, fog, hail, haze, smoke, or smog) as described in the background art. May be performed in accordance with the communication quality of the radio link 50.
- each of the controllers 12 and 22 may determine the wireless communication parameters (based on the mechanical vibration of the antenna 10 or 20 to compensate for the deterioration of the communication quality of the wireless link 50 due to the mechanical vibration of the antenna 10 or 20. For example, the modulation scheme and / or coding rate are adjusted. In other words, each of the controllers 12 and 22 adjusts wireless communication parameters based on quality indicators related to mechanical vibrations of the structure to which the antenna 10 or 20 is attached. The mechanical vibration of the structure to which the antenna 10 or 20 is attached is transmitted to the antenna 10 or 20. Thus, it can be said that each of the controllers 12 and 22 adjusts the wireless communication parameters based on a quality indicator associated with the mechanical vibration of the antenna 10 or 20.
- the quality index related to the mechanical vibration of the structure may be a measured value indicating the displacement, speed, or acceleration of the structure to which the antenna 10 or 20 is attached. These measurements may be obtained by a vibration sensor coupled to a structure to which the antenna 10 or 20 is attached. Instead, the quality indicator related to the mechanical vibration of the structure is a statistical value (eg, standard deviation or variance) indicating fluctuations in the communication quality (eg, RSSI, SNR, or BER) of the radio link 50. May be.
- FIG. 2 shows a specific example of mechanical vibration of a structure to which the antenna 10 is attached.
- the antenna 10 is fixedly attached to a structure 40 (for example, a streetlight pole and a bus shelter).
- the communication apparatus 1 including the antenna 10 and the transceiver 11 as well as the antenna 10 may be attached to the structure 40.
- the communication device 1 When the communication device 1 is used for a mobile backhaul of a small cell base station, the communication device 1 and the small cell base station may be attached to the structure 40.
- the data transfer device may be attached to the structure 40 together with the communication device 1 and the small cell base station.
- the data transfer device transfers a data packet (for example, an IP (Internet Protocol) packet) or a data frame (for example, a MAC (Media Access Control) frame) between the communication device 1 and the small cell base station.
- the data transfer device is, for example, a router, a layer 3 switch, or a layer 2 switch.
- the structure 40 is deformed and mechanically vibrated by external forces such as wind, subway vibrations, and earthquakes. As the structure 40 vibrates, the antenna 10 also vibrates mechanically. Since the antenna 10 communicates with the directional beam 51 directed to the antenna 20 of the communication device 2, the communication quality of the wireless link 50 is increased by the direction of the antenna 10 (that is, the directional beam 51) being fluctuated by mechanical vibration. May deteriorate.
- the AMC for coping with changes in the propagation state due to weather conditions as described in the background art may be performed in accordance with the speed of changes in the weather.
- the average value of radio link communication quality for example, RSSI, SNR, or BER
- the modulation scheme and coding rate may be changed according to the average value of the communication quality. The reason why the average value of the communication quality is used as an index is to prevent the sudden follow-up of quality fluctuation in a short time.
- the frequency and vibration period of the structure 40 are determined according to the natural frequency and the natural period of the structure 40.
- the natural frequency of structures such as lampposts and bus shelters is typically about 1 Hz to 10 Hz, and roughly estimated to be about 0.1 Hz to 20 Hz.
- the natural period of these structures is typically about 0.1 to 1 second, and is roughly estimated to be about 0.05 to 10 seconds. Therefore, the vibration period of the structure 40 to which the point-to-point wireless antenna 10 is attached is typically about 0.1 to 1 second, and roughly estimated to be about 0.05 to 10 seconds.
- FIG. 3 is a frequency distribution diagram showing an example of the influence of the mechanical vibration of the antenna 10 or 20 on the communication quality.
- the communication quality is, for example, received signal strength, SNR, or BER.
- the broken line graph in FIG. 3 shows the distribution of the communication quality of the wireless link 50 when no mechanical vibration of the antennas 10 and 20 occurs.
- the solid line graph in FIG. 3 shows the distribution of the communication quality of the wireless link 50 when the mechanical vibrations of the antennas 10 and 20 occur. It should be noted that when mechanical vibration occurs, not only the average value (or median value) of communication quality is lowered, but also fluctuation (variation) in communication quality is increased.
- the time scale of the fluctuation of the communication quality is determined by the natural period of the structure 40 to which the antenna 10 or 20 is attached, and is based on the weather condition (for example, rain, fog, haze, haze, smoke, or smog). Very short compared to the time scale of change.
- the “average value” of communication quality used as an index in AMC for dealing with changes in the propagation state due to weather conditions is the deterioration of communication quality due to mechanical vibration of the antenna 10 or 20. It may not be appropriate as an indicator for observing This is because the “average value” of the communication quality cannot sufficiently represent the fluctuation (variation) of the communication quality due to the mechanical vibration.
- the observation of communication quality on a long time scale (for example, every minute to every hour) in AMC to cope with changes in propagation conditions due to weather conditions is the communication quality caused by mechanical vibration of the antenna 10 or 20 It may not be possible to observe the deterioration of This is because the vibration period of the antenna 10 or 20 determined according to the natural period of the structure 40 has a very short time scale compared to the speed of change in weather.
- each of the controllers 12 and 22 is configured to adjust the modulation scheme, the coding rate, and the like based on the mechanical vibration of the antenna 10 or 20. Specifically, each of the controllers 12 and 22 responds to the detection of the mechanical vibration of the antenna 10 or 20 (or according to the magnitude of the mechanical vibration), and the following (a) to (e ) May be adjusted.
- the controller 12 applies a modulation scheme to be applied to the transmission signal of the transceiver 11 to the first modulation scheme (for example, 64 ⁇ ⁇ ⁇ Quadrature Amplitude having a small inter-symbol distance).
- Modulation 64-QAM
- a second modulation scheme having a large inter-symbol distance for example, 16-QAM or Quadrature
- Phase ⁇ Shift ⁇ Keying QPSK
- the controller 12 may be changed to a modulation scheme having a relatively large intersymbol distance as the mechanical vibration of the antenna 10 or 20 increases.
- the mechanical vibration of the antenna 10 or 20 increases the propagation loss of the radio link 50 and may cause a decrease in received signal strength. Therefore, an increase in the code error rate can be suppressed by using a modulation scheme in which the inter-symbol distance is relatively large, that is, resistant to noise and interference while mechanical vibration of the antenna 10 or 20 occurs.
- the controller 12 may reduce the coding rate applied to the transmission signal of the transceiver 11 when the mechanical vibration of the antenna 10 or 20 is detected (that is, increase the redundancy of the transmission signal). Further, the controller 12 may lower the coding rate as the mechanical vibration of the antenna 10 or 20 is larger. Thereby, the increase in the code error rate resulting from the mechanical vibration of the antenna 10 or 20 can be suppressed.
- the controller 12 may increase the transmission power of the transceiver 11 when mechanical vibration of the antenna 10 or 20 is detected. Further, the controller 12 may increase the transmission power of the transceiver 11 as the mechanical vibration of the antenna 10 or 20 increases. As a result, it is possible to compensate for a decrease in received signal strength due to mechanical vibration of the antenna 10 or 20, and thus suppress an increase in the code error rate.
- the controller 12 may widen the transmission beam width and / or the reception beam width of the antenna 10. Further, the controller 12 may increase the transmission beam width and / or the reception beam width as the mechanical vibration of the antenna 10 or 20 increases.
- a narrow directional beam is used when mechanical vibration of the antenna 10 or 20 is occurring, the fluctuation range of the received signal intensity becomes large. Therefore, by using a relatively wide directional beam while the mechanical vibration of the antenna 10 or 20 is occurring, the fluctuation range of the received signal strength can be reduced, and thus the fluctuation range of the code error rate can be reduced. Can be small.
- the mechanical vibration of the antenna 10 or 20 may be detected directly using a vibration sensor.
- a vibration sensor is a sensor that measures the displacement, speed, or acceleration of an object.
- the vibration sensor is coupled to the structure 40, the antenna 10 (20), or the transceiver 11 (21), and the displacement of the structure 40, the antenna 10 (20), or the transceiver 11 (21) is detected.
- Speed, or acceleration may be measured.
- the mechanical vibration of the antenna 10 or 20 may be detected indirectly by observing fluctuations in the communication quality of the wireless link 50.
- each of the controllers 12 and 22 may detect mechanical vibration indirectly by using a quality index indicating the magnitude of the communication quality fluctuation of the wireless link 50.
- each of the controllers 12 and 22 generates mechanical vibrations in the antenna 10 or 20 based on the magnitude of the fluctuation of the communication quality of the wireless link 50 exceeding a predetermined level (threshold). It may be determined that The method using the communication quality of the wireless link 50 has an advantage that it does not need to use a vibration sensor and does not require a new interface for supplying the output signals of the vibration sensor to the controllers 12 and 22.
- the method using the communication quality of the radio link 50 has an advantage that it has high affinity with an existing AMC that similarly uses the communication quality of the radio link 50 and can be easily implemented by improving the existing AMC algorithm. .
- the quality index indicating the magnitude of communication quality fluctuation may be a statistical value (eg, standard deviation or variance) indicating the magnitude of fluctuation of a plurality of communication quality measurement values.
- the plurality of communication quality measurement values are preferably repeatedly measured at an interval shorter than the natural period of the structure 40 or the forced vibration period of the wind so that mechanical vibration can be detected.
- the natural period of the structure 40 or the forced vibration period due to wind is typically about 0.1 to 1 second, and is roughly estimated to be about 0.05 to 10 seconds.
- FIG. 4 is a flowchart showing an example of an adaptive control procedure performed by the controllers 12 and 22.
- the controller 12 (22) acquires the magnitude of the mechanical vibration of the antenna 10 or 20 detected directly or indirectly.
- the magnitude of the mechanical vibration may be calculated using an output signal of the vibration sensor, or may be calculated using a communication quality measurement value of the wireless link 50.
- the controller 12 (22) adjusts at least one of the modulation scheme, the coding rate, the transmission power, the transmission beam width, and the reception beam width according to the magnitude of the mechanical vibration of the antenna 10 or 20. To do.
- the point-to-point wireless system adjusts at least one of the modulation scheme, the coding rate, the transmission power, and the transmission beam width based on the mechanical vibration of the antenna 10 or 20. It is configured to Therefore, the point-to-point wireless system according to the present embodiment reduces the communication quality of the point-to-point wireless link 50 due to mechanical vibration of the structure 40 to which the communication device 1 or 2 (antenna 10 or 20) is attached. Can be suppressed.
- This embodiment shows one specific example of the configuration and adaptive control procedure of the point-to-point wireless system described in the first embodiment.
- the modulation scheme, the coding rate, and the like are adjusted according to the magnitude of fluctuations in the communication quality of the wireless link 50 calculated from a plurality of communication quality measurement values.
- a configuration example of the point-to-point wireless system according to the present embodiment is the same as that shown in FIG.
- FIG. 5 is a block diagram illustrating a configuration example of the communication device 1 according to the present embodiment.
- the communication device 2 is configured similarly to the communication device 1.
- the communication apparatus 1 illustrated in FIG. 5 includes an antenna 10, a controller 12, a transmitter 13, a receiver 14, and a duplexer 15.
- the transmitter 13 and the receiver 14 correspond to the transceiver 11 shown in FIG.
- FIG. 5 shows an example in which bidirectional communication is performed by Frequency ⁇ ⁇ ⁇ Division Duplex (FDD), and the duplexer 15 is used to separate the transmission frequency band and the reception frequency band.
- the communication apparatus 1 may perform two-way communication using Time Division Duplex (TDD).
- TDD Time Division Duplex
- a high frequency switch may be used for switching between transmission and reception instead of the duplexer 15.
- the transmitter 13 shown in FIG. 5 includes a Forward Error Correction (FEC) encoder 131, a modulator 132, a DA converter 133, and a TX-RF 134.
- the FEC encoder 131 performs transmission line coding of transmission data according to the FEC scheme.
- the modulator 132 receives the encoded data sequence generated by the FEC encoder 131, maps the encoded data sequence to transmission symbols, band-limits the transmission symbol sequence with a low-pass filter, and thereby generates a transmission baseband signal To do.
- the DA converter 133 converts the digital transmission baseband signal into an analog signal.
- the TX-RF134 generates a modulated signal by mixing the analog transmit baseband signal with the local oscillator signal, upconverts the modulated signal to a radio frequency (RF), and amplifies the RF signal And send it to the antenna 10.
- RF radio frequency
- the receiver shown in FIG. 5 includes an RX-RF 141, an AD converter 142, a demodulator 143, and an FEC decoder 144.
- the RX-RF 141 amplifies the received RF signal received by the antenna 10 using a Low Noise Amplifier (LNA), and down-converts the received RF signal to an Intermediate frequency (IF) band.
- the AD converter 142 converts the received IF signal into a digital signal.
- the demodulator 143 performs demodulation processing in the digital domain. That is, the demodulator 143 multiplies the digital reception IF signal with the digital sine wave signal, performs low-pass filter processing, and thereby generates an orthogonal baseband signal.
- the demodulator 143 performs symbol determination (symbol demapping) on the orthogonal baseband signal and generates a reception data sequence.
- the FEC decoder 144 performs error correction on the received data string in accordance with the transmission path coding scheme performed by the opposite device (communication device 2).
- the controller 12 refers to the communication quality obtained at the receiver 14, refers to the modulation scheme in the modulator 132, the coding rate in the FEC encoder 131, the transmission power in the TX-RF 134, the transmission beam width (transmission weight vector in the TX-RF 134). ) Is adaptively adjusted.
- the controller 12 may adaptively adjust the reception beam width (reception weight vector) in the RX-RF 141.
- the communication quality obtained at the receiver 14 is, for example, the received signal strength (RSSI) obtained at the RX-RF 141, the SNR obtained at the demodulator 143, or the BER obtained at the FEC decoder 144.
- RSSI received signal strength
- the controller 12 observes fluctuations in the communication quality of the radio link 50 and adjusts the modulation scheme and coding rate based on the magnitude of fluctuations in the communication quality. That is, the controller 12 according to the present embodiment indirectly detects the mechanical vibration of the antenna 10 by observing fluctuations in the communication quality of the wireless link 50.
- FIG. 6 is a flowchart showing an example of an adaptive control procedure performed by the controller 12 according to the present embodiment.
- the adaptive control procedure by the controller 22 is the same as this.
- step S21 in order to detect fluctuations in the communication quality of the radio link 50 that are likely to be caused by the mechanical vibration of the antenna 10, the controller 12 detects the natural period or wind of the structure 40 to which the antenna 10 is attached. A plurality of communication quality measurement values that are repeatedly measured at intervals shorter than the forced vibration period due to are acquired. As already described, the natural period of the structure 40 or the forced vibration period due to wind is typically about 0.1 to 1 second, and is roughly estimated to be about 0.05 to 10 seconds. And the controller 12 calculates the statistical value (for example, standard deviation or dispersion
- the statistical value for example, standard deviation or dispersion
- step S22 the controller 12 adjusts at least one of the modulation scheme, the coding rate, the transmission power, the transmission beam width, and the reception beam width in accordance with the magnitude of the communication quality fluctuation of the radio link 50.
- the present embodiment shows another specific example of the configuration and adaptive control procedure of the point-to-point wireless system described in the first embodiment.
- the modulation scheme, the coding rate, and the like are adjusted according to the magnitude of the mechanical vibration directly detected by the vibration sensor is described.
- a configuration example of the point-to-point wireless system according to the present embodiment is the same as that shown in FIG.
- FIG. 7 is a block diagram illustrating a configuration example of the communication device 1 according to the present embodiment.
- the communication device 2 is configured similarly to the communication device 1.
- the communication device 1 illustrated in FIG. 7 includes a vibration sensor 31.
- the vibration sensor 31 is coupled to the structure 40, the communication device 1, or the antenna 10, and measures the displacement, speed, or acceleration of the structure 40, the communication device 1, or the antenna 10.
- the controller 12 according to the present embodiment receives the output signal of the vibration sensor 31 and detects the mechanical vibration of the antenna 10 (or the structure 40) based on the output signal of the vibration sensor 31.
- the configuration and operation of the other elements shown in FIG. 7 are the same as those of the elements denoted by the same reference numerals shown in FIG.
- FIG. 8 is a flowchart showing an example of an adaptive control procedure performed by the controller 12 according to the present embodiment.
- the adaptive control procedure by the controller 22 is the same as this.
- the controller 12 detects mechanical vibration of the antenna 10 (or the structure 40) based on the output signal of the vibration sensor 31.
- the controller 12 selects at least one of a modulation scheme, a coding rate, a transmission power, a transmission beam width, and a reception beam width according to the magnitude of the mechanical vibration of the antenna 10 (or the structure 40). adjust.
- each of the communication devices 1 and 2 includes a first adaptation process for dealing with fluctuations in the communication quality of the radio link 50 caused by mechanical vibration of the antenna 10, and weather.
- the second adaptive processing for coping with the deterioration of the communication quality of the wireless link 50 due to conditions (for example, rain, fog, haze, haze, smoke, or smog) is performed together.
- the first adaptive process and the second adaptive process are referred to as a first AMC and a second AMC.
- the first AMC is the same as the adaptive processing described in the first and second embodiments. That is, in the first AMC, each of the controllers 12 and 22 uses the plurality of communication quality measurement values repeatedly measured at intervals shorter than the natural period of the structure 40 (or the forced vibration period by the wind), and the radio link 50.
- the communication quality for example, RSSI, SNR, or BER
- the communication quality fluctuation is calculated, and the modulation scheme and coding rate are adjusted according to the communication quality fluctuation.
- the second AMC is an AMC for dealing with changes in the propagation state due to weather conditions. That is, in the second AMC, each of the controllers 12 and 22 has the radio link communication quality (eg, for example) observed on a long time scale (eg, every minute to 1 hour) corresponding to the speed of change in weather.
- the average value of RSSI, SNR, or BER) is used as an index, and the modulation scheme and coding rate are adjusted according to the average value of the communication quality.
- the reason why the average value of the communication quality is used as an index is to prevent the sudden follow-up of quality fluctuation in a short time.
- the first and second AMCs have different communication quality indexes to be used, and the communication quality indexes have different time scales.
- the first AMC in order to determine the mechanical vibration of the antenna 10, a statistical value (for example, standard deviation) indicating the magnitude of fluctuation in the communication quality of the wireless link 50 within a time shorter than the natural period of the structure 40. Or dispersion) is used.
- the second AMC in order to judge the deterioration of the visibility between the antennas 10 and 20 due to the weather change on a relatively long time scale, and to follow the sudden short-term quality fluctuation. In order to avoid this, the average value of the communication quality of the radio link 50 is used.
- FIG. 9 is a flowchart illustrating an example of an adaptive control procedure performed by the controller 12 according to the present embodiment.
- the adaptive control procedure by the controller 22 is the same as this.
- a standard deviation of communication quality is used as a quality index indicating the magnitude of the communication quality fluctuation of the radio link 50.
- the first AMC (S41) that is, AMC for dealing with the mechanical vibration of the antenna 10
- the second AMC (S45) that is, AMC for coping with a change in weather conditions is performed.
- the first AMC (S41) in FIG. 9 includes steps S42 to S44.
- step S42 the controller 12 calculates the standard deviation of the communication quality of the radio link 50. As already described, this standard deviation may be a standard deviation of a plurality of communication quality measurement values repeatedly measured within a time shorter than the natural period of the structure 40.
- step S43 the controller 12 determines whether or not the standard deviation of communication quality exceeds a predetermined threshold value. If the standard deviation of communication quality exceeds the threshold (YES in step S43), the controller 12 performs AMC based on the standard deviation of communication quality (step S44). That is, the controller 12 may adjust at least one of the modulation scheme, the coding rate, the transmission power, the transmission beam width, and the reception beam width according to the standard deviation of the communication quality.
- the controller 12 performs the second AMC (S45). That is, the controller 12 calculates the average value of the communication quality of the radio link 50 (step S46), and performs AMC based on the average value of the communication quality (step S47). That is, the controller 12 may adjust at least one of the modulation scheme, the coding rate, the transmission power, the transmission beam width, and the reception beam width in accordance with the average value of the communication quality.
- the point-to-point wireless system includes the first AMC for dealing with the mechanical vibration of the antenna 10 and the visibility between the antennas 10 and 20 due to weather changes. Since the second AMC for coping with the deterioration of the network is performed together, the communication quality of the radio link 50 can be more reliably maintained.
- the adaptive control described in the plurality of embodiments described above may be performed only in one of the communication devices 1 and 2.
- these adaptive controls may be performed on only one of the communication devices 1 and 2 that is attached to a structure that is easily deformed by an external force (such as a streetlight pole and a bus shelter).
- the example has been shown in which the communication apparatuses 1 and 2 transmit signals bidirectionally via a point-to-point wireless link.
- the communication devices 1 and 2 may be configured to transmit signals in only one direction over a point-to-point wireless link.
- the communication quality (reception signal quality) measured in the communication device (for example, communication device 2) on the reception side may be fed back to the communication device (for example, communication device 1) on the transmission side. This feedback may occur over a control line that is different from the point-to-point wireless link.
- the architecture of the communication devices 1 and 2 shown in FIGS. 5 and 7 is merely an example.
- Various transmission and reception architectures have been proposed for point-to-point radio.
- the communication devices 1 and 2 may employ these various transmission and reception architectures.
- each of the controllers 12 and 22 described in the above-described embodiments may be realized using a semiconductor processing apparatus including Application Specific Integrated Circuit (ASIC).
- ASIC Application Specific Integrated Circuit
- these processes may be realized by causing a computer system including at least one processor (e.g. microprocessor or digital signal processor (DSP)) to execute a program.
- processor e.g. microprocessor or digital signal processor (DSP)
- DSP digital signal processor
- Non-transitory computer readable media include various types of tangible storage media (tangible storage medium). Examples of non-transitory computer-readable media are magnetic recording media (eg flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (eg magneto-optical discs), CompactComp Disc Read Only Memory (CD-ROM), CD-ROM Includes R, CD-R / W, semiconductor memory (eg mask ROM, Programmable ROM (PROM), Erasable PROM (EPROM), flash ROM, Random Access Memory (RAM)).
- the program may also be supplied to the computer by various types of temporary computer-readable media. Examples of transitory computer readable media include electrical signals, optical signals, and electromagnetic waves.
- the temporary computer-readable medium can supply the program to the computer via a wired communication path such as an electric wire and an optical fiber, or a wireless communication path.
- a point-to-point wireless system First and second communication devices connected to first and second antennas respectively attached to the first and second structures, respectively, and communicating with the first and second antennas, respectively; A controller configured to adjust a wireless communication parameter applied to the communication based on a quality index related to mechanical vibration of at least one of the first and second structures; A point-to-point wireless system.
- the wireless communication parameters include at least one of a modulation scheme, a coding rate, a transmission power, a transmission beam width, and a reception beam width.
- the point-to-point wireless system according to attachment 1.
- the quality indicator indicates the magnitude of fluctuations of a plurality of communication quality measurement values repeatedly measured at an interval shorter than the natural period of the first or second structure or the forced vibration period due to wind.
- Appendix 4 The point-to-point wireless system according to appendix 3, wherein the natural period and the forced vibration period are in a range of 0.05 to 10 seconds.
- Appendix 5 The point-to-point wireless system according to appendix 1 or 2, wherein the quality indicator is a standard deviation or variance of a plurality of communication quality measurement values repeatedly measured at intervals shorter than a predetermined time.
- Appendix 6 The point-to-point wireless system according to appendix 5, wherein the predetermined time is in a range of 0.05 seconds to 10 seconds.
- Appendix 7 The point-to-point wireless system according to any one of appendices 1 to 6, wherein the control unit increases a transmission beam width or a reception beam width of the first or second antenna as the mechanical vibration increases.
- a point-to-point wireless system First and second communication devices connected to first and second antennas respectively attached to the first and second structures, respectively, and communicating with the first and second antennas, respectively;
- the wireless communication parameter applied to the communication is related to a first quality indicator related to a propagation characteristic of a wireless link, and further to mechanical vibration of at least one of the first or second structures.
- a controller that adjusts based on the second quality indicator;
- the wireless communication parameters include at least one of a modulation scheme, a coding rate, a transmission power, a transmission beam width, and a reception beam width.
- the point-to-point wireless system according to appendix 8.
- the first quality indicator indicates a communication quality related to the communication every first time
- the second quality index indicates a magnitude of fluctuations in communication quality of the radio link obtained from a plurality of communication quality measurement values repeatedly measured within a second time shorter than the first time.
- Appendix 12 The point-to-point wireless system according to any one of appendices 8 to 11, wherein the second time is determined according to a natural period of the first or the second structure or a forced vibration period due to wind.
- Appendix 14 The point-to-point wireless system according to appendix 10, wherein the second time is in a range of 0.05 seconds to 10 seconds.
- Appendix 15 Any one of appendices 8 to 14, wherein the first quality indicator indicates deterioration in communication quality of the radio link due to deterioration in visibility between the first antenna and the second antenna due to weather conditions.
- the point-to-point wireless system according to item.
- the first quality indicator indicates the deterioration of communication quality of the wireless link due to an attenuation effect of at least one of rain, fog, haze, haze, smoke, and smog, according to any one of appendices 8 to 15. Point-to-point wireless system.
- Appendix 18 15. The point-to-point wireless system according to appendix 10 or 14, wherein the first time is in a range of 1 minute to 1 hour.
Abstract
Description
図1は、本実施形態に係るポイントツーポイント無線システムの構成例を示している。本実施形態のポイントツーポイント無線システムは、通信装置1及び2を含む。通信装置1及び2は、アンテナ10及び20をそれぞれ有する。アンテナ10及び20は、指向性アンテナである。通信装置1及び2は、指向性ビームを互いに向け合うことでアンテナ10及び20の間にポイントツーポイント無線リンク50を確立し、無線リンク50を介してお互いの間で少なくとも一方向に信号を送信する。図1に示された具体例では、通信装置1及び2は、送受信機(トランシーバ)11及び21をそれぞれ有し、無線リンク50を介して双方向に信号を送信する。
(a)送受信機11(又は21)の送信信号に適用される変調スキーム
(b)送受信機11(又は21)の送信信号に適用される符号化率
(c)送受信機11(又は21)の送信信号に適用される送信電力
(d)送受信機11(又は21)の送信信号に適用される送信ビーム幅
(e)送受信機11(又は21)の受信信号に適用される受信ビーム幅
本実施形態は、第1の実施形態で説明されたポイントツーポイント無線システムの構成及び適応制御手順の具体例の1つを示す。本実施形態では、複数の通信品質計測値から計算された無線リンク50の通信品質の揺らぎの大きさに応じて変調スキーム及び符号化率などを調整する例が説明される。本実施形態に係るポイントツーポイント無線システムの構成例は、図1と同様である。
本実施形態は、第1の実施形態で説明されたポイントツーポイント無線システムの構成及び適応制御手順の他の具体例を示す。本実施形態では、振動センサにより直接的に検出された機械的振動の大きさに応じて変調スキーム及び符号化率などを調整する例が説明される。本実施形態に係るポイントツーポイント無線システムの構成例は、図1と同様である。
本実施形態では、上述した第2の実施形態の改良について更に説明する。本実施形態に係るポイントツーポイント無線システムの構成例は、図1と同様である。本実施形態では、通信装置1及び2(コントローラ12及び22)の各々は、アンテナ10の機械的振動に起因する無線リンク50の通信品質の揺らぎに対処するための第1の適応処理と、気象条件(例えば、雨、霧、靄、煙霧、煙、又はスモッグ)による無線リンク50の通信品質の劣化に対処するための第2の適応処理を共に行う。以下では、第1の適応処理及び第2の適応処理を、第1のAMC及び第2のAMCと呼ぶ。
上述した複数の実施形態で説明された適応制御は、通信装置1及び2の一方のみにおいて行われてもよい。例えば、これらの適応制御は、通信装置1及び2のうち、外力によって変形しやすい構造物(街灯柱及びバス待合所等)に取り付けられた一方のみにおいて行われてもよい。
ポイントツーポイント無線システムであって、
第1及び第2の構造物にそれぞれ取り付けられる第1及び第2のアンテナにそれぞれ接続され、それぞれ前記第1及び前記第2のアンテナにより通信する第1及び第2の通信装置と、
前記通信に適用される無線通信パラメータを、前記第1又は前記第2の構造物のうち少なくとも1つの構造物の機械的振動に関連する品質指標に基づいて調整する制御部と、
を備える、ポイントツーポイント無線システム。
前記無線通信パラメータは、変調スキーム、符号化率、送信電力、送信ビーム幅、および受信ビーム幅のうちの少なくとも1つを含む、
付記1に記載のポイントツーポイント無線システム。
前記品質指標は、前記第1又は前記第2の構造物の固有周期又は風による強制振動周期より短い間隔で繰り返し計測された複数の通信品質測定値の揺らぎの大きさを示す、付記1又は2に記載のポイントツーポイント無線システム。
前記固有周期及び前記強制振動周期は、0.05秒~10秒の範囲内である、付記3に記載のポイントツーポイント無線システム。
前記品質指標は、所定の時間より短い間隔で繰り返し計測された複数の通信品質測定値の標準偏差又は分散である、付記1又は2に記載のポイントツーポイント無線システム。
前記所定の時間は、0.05秒~10秒の範囲内である、付記5に記載のポイントツーポイント無線システム。
前記制御部は、前記機械的振動が大きくなるにつれて前記第1又は前記第2のアンテナの送信ビーム幅又は受信ビーム幅を広げる、付記1~6のいずれか1項に記載のポイントツーポイント無線システム。
ポイントツーポイント無線システムであって、
第1及び第2の構造物にそれぞれ取り付けられる第1及び第2のアンテナにそれぞれ接続され、それぞれ前記第1及び前記第2のアンテナにより通信する第1及び第2の通信装置と、
前記通信に適用される無線通信パラメータを、無線リンクの伝搬特性に関連する第1の品質指標と、さらに前記第1又は第2の構造物のうち少なくとも1つの構造物の機械的振動に関連する第2の品質指標とに基づいて調整する制御部と、
を備える、ポイントツーポイント無線システム。
前記無線通信パラメータは、変調スキーム、符号化率、送信電力、送信ビーム幅、及び受信ビーム幅のうち少なくとも1つを含む、
付記8に記載のポイントツーポイント無線システム。
前記第1の品質指標は、第1の時間毎の前記通信に関する通信品質を示し、
前記第2の品質指標は、前記第1の時間より短い第2の時間内において繰り返し計測された複数の通信品質計測値から得られる前記無線リンクの通信品質の揺らぎの大きさを示す、
付記8又は9に記載のポイントツーポイント無線システム。
前記第2の品質指標は、前記第1又は前記第2の構造物の機械的振動に起因する前記無線リンクの通信品質の揺らぎの大きさを示す、付記8~10のいずれか1項に記載のポイントツーポイント無線システム。
前記第2の時間は、前記第1又は前記第2の構造物の固有周期又は風による強制振動周期に応じて定められる、付記8~11のいずれか1項に記載のポイントツーポイント無線システム。
前記第2の品質指標は、前記通信に関する複数の通信品質計測値の標準偏差又は分散である、付記8~12のいずれか1項に記載のポイントツーポイント無線システム。
前記第2の時間は、0.05秒~10秒の範囲内である、付記10に記載のポイントツーポイント無線システム。
前記第1の品質指標は、気象条件による前記第1のアンテナと前記第2のアンテナの間の視程の悪化に起因する前記無線リンクの通信品質の劣化を示す、付記8~14のいずれか1項に記載のポイントツーポイント無線システム。
前記第1の品質指標は、雨、霧、靄、煙霧、煙、及びスモッグのうち少なくとも1つの減衰効果による前記無線リンクの通信品質の劣化を示す、付記8~15のいずれか1項に記載のポイントツーポイント無線システム。
前記第1の品質指標は、前記無線リンクの通信品質の平均値である、付記8~16のいずれか1項に記載のポイントツーポイント無線システム。
前記第1の時間は、1分~1時間の範囲内である、付記10又は14に記載のポイントツーポイント無線システム。
10、20 アンテナ
11、21 送受信機(トランシーバ)
12、22 コントローラ
13 送信機
14 受信機
15 デュプレクサ
31 振動センサ
40 構造物
50 ポイントツーポイント無線リンク
51 指向性ビーム
131 Forward Error Correction(FEC)エンコーダ
132 シンボルマッパ
133 DAコンバータ
134 送信RFユニット(TX-RF)
141 受信RFユニット(RX-RF)
142 ADコンバータ
143 復調器
144 FECデコーダ
Claims (21)
- ポイントツーポイント無線システムであって、
第1及び第2の構造物にそれぞれ取り付けられる第1及び第2のアンテナにそれぞれ接続され、それぞれ前記第1及び前記第2のアンテナにより通信する第1及び第2の通信装置と、
前記通信に適用される無線通信パラメータを、前記第1又は前記第2の構造物のうち少なくとも1つの構造物の機械的振動に関連する品質指標に基づいて調整する制御手段と、
を備える、ポイントツーポイント無線システム。 - 前記無線通信パラメータは、変調スキーム、符号化率、送信電力、送信ビーム幅、及び受信ビーム幅のうち少なくとも1つを含む、
請求項1に記載のポイントツーポイント無線システム。 - 前記機械的振動を直接的に又は間接的に検出する検出手段をさらに備え、
前記品質指標は、前記検出手段による検出結果を基に算出される、
請求項1又は2に記載のポイントツーポイント無線システム。 - 前記検出手段は、前記第1のアンテナ、前記第2のアンテナ、前記第1の構造物、又は前記第2の構造物に結合された振動センサを用いて前記機械的振動を直接的に計測する、
請求項3に記載のポイントツーポイント無線システム。 - 前記検出手段は、前記通信に関する通信品質の揺らぎに基づき前記機械的振動を間接的に計測する、
請求項3に記載のポイントツーポイント無線システム。 - 構造物に取り付けられるアンテナと、
前記アンテナに電気的に接続される通信手段と、
前記通信手段に適用される無線通信パラメータを前記構造物の揺れに関連する通信品質を示す品質指標に基づいて制御する制御手段と、
を備える、通信装置。 - 前記無線通信パラメータは、変調スキーム、符号化率、送信電力、送信ビーム幅、および受信ビーム幅のうちの少なくとも1つを含む、
請求項6に記載の通信装置。 - 前記揺れを直接的又は間接的に検出する検出手段をさらに備え、
前記品質指標は、前記検出手段による検出結果を基に算出される、
請求項6又は7に記載の通信装置。 - 前記検出手段は、前記アンテナ又は前記構造物に結合された振動センサを用いて前記揺れを直接的に計測する、
請求項8に記載の通信装置。 - 前記検出手段は、前記通信に関する通信品質の揺らぎに基づき前記機械的振動を間接的に計測する、
請求項8に記載の通信装置。 - ポイントツーポイント無線通信で通信するための通信制御方法であって、
構造物に取り付けられるアンテナにより通信し、
前記通信に適用される無線通信パラメータを前記構造物の機械的振動に基づいて制御する、
通信制御方法。 - 構造物に取り付けられるアンテナによりポイントツーポイント無線通信で通信するための通信制御方法をコンピュータに行わせるためのプログラムを格納した非一時的なコンピュータ可読媒体であって、
前記通信制御方法は、前記通信に適用される無線通信パラメータを、前記構造物の機械的振動に基づいて調整する、
非一時的なコンピュータ可読媒体。 - ポイントツーポイント無線システムであって、
第1及び第2の構造物にそれぞれ取り付けられる第1及び第2のアンテナにそれぞれ接続され、それぞれ前記第1及び前記第2のアンテナにより通信する第1及び第2の通信装置と、
前記通信に適用される無線通信パラメータを、無線リンクの伝搬特性に関連する第1の品質指標と、さらに前記第1又は第2の構造物のうち少なくとも1つの構造物の機械的振動に関連する第2の品質指標とに基づいて調整する制御手段と、
を備える、ポイントツーポイント無線システム。 - 前記無線通信パラメータは、変調スキーム、符号化率、送信電力、送信ビーム幅、及び受信ビーム幅のうち少なくとも1つを含む、
請求項13に記載のポイントツーポイント無線システム。 - 前記機械的振動を直接的に又は間接的に検出する検出手段をさらに備え、
前記第2の品質指標は、前記検出手段による検出結果を基に算出される、
請求項13又は14に記載のポイントツーポイント無線システム。 - 前記検出手段は、前記第1のアンテナ、前記第2のアンテナ、前記第1の構造物、又は前記第2の構造物に結合された振動センサを用いて前記機械的振動を直接的に計測する、
請求項15に記載のポイントツーポイント無線システム。 - 前記検出手段は、前記通信に関する通信品質の揺らぎに基づき前記機械的振動を間接的に計測する、
請求項15に記載のポイントツーポイント無線システム。 - ポイントツーポイント無線通信で通信する通信装置であって、
構造物に取り付けられるアンテナに接続される通信手段と、
前記通信に適用される無線通信パラメータを、無線リンクの伝搬特性に関連する第1の品質指標と、さらに前記構造物の機械的振動に関連する第2の品質指標とに基づいて調整する制御手段と、
を備える、通信装置。 - 前記無線通信パラメータは、変調スキーム、符号化率、送信電力、送信ビーム幅、及び受信ビーム幅のうち少なくとも1つを含む、
請求項18に記載の通信装置。 - ポイントツーポイント無線通信で通信するための通信制御方法であって、
構造物に取り付けられるアンテナにより通信し、
前記通信に適用される無線通信パラメータを、無線リンクの伝搬特性に関連する第1の品質指標と、さらに前記構造物の機械的振動に関連する第2の指標とに基づいて調整する、通信制御方法。 - 構造物に取り付けられるアンテナによりポイントツーポイント無線通信で通信するための通信制御方法をコンピュータに行わせるためのプログラムを格納した非一時的なコンピュータ可読媒体であって、
前記通信制御方法は、前記通信に適用される無線通信パラメータを、無線リンクの伝搬特性に関連する第1の品質指標と、さらに前記構造物の機械的振動に関連する第2の指標とに基づいて調整する、
非一時的なコンピュータ可読媒体。
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MX2016000749A (es) | 2016-04-15 |
EP3024151A1 (en) | 2016-05-25 |
CN105379004A (zh) | 2016-03-02 |
RU2016105249A (ru) | 2017-08-23 |
US20160173227A1 (en) | 2016-06-16 |
EP3024151A4 (en) | 2017-03-22 |
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