WO2015162878A1 - 無線通信システムにおける無線通信制御方法および装置、ならびに無線通信装置 - Google Patents
無線通信システムにおける無線通信制御方法および装置、ならびに無線通信装置 Download PDFInfo
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- WO2015162878A1 WO2015162878A1 PCT/JP2015/002082 JP2015002082W WO2015162878A1 WO 2015162878 A1 WO2015162878 A1 WO 2015162878A1 JP 2015002082 W JP2015002082 W JP 2015002082W WO 2015162878 A1 WO2015162878 A1 WO 2015162878A1
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- 238000004891 communication Methods 0.000 title claims abstract description 308
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000001556 precipitation Methods 0.000 claims description 46
- 230000006870 function Effects 0.000 description 20
- 230000005540 biological transmission Effects 0.000 description 17
- 238000010586 diagram Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 238000010801 machine learning Methods 0.000 description 5
- 230000002238 attenuated effect Effects 0.000 description 4
- 239000000284 extract Substances 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 238000004088 simulation Methods 0.000 description 2
- 238000013528 artificial neural network Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/08—Testing, supervising or monitoring using real traffic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/26—Monitoring; Testing of receivers using historical data, averaging values or statistics
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/318—Received signal strength
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/373—Predicting channel quality or other radio frequency [RF] parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/22—TPC being performed according to specific parameters taking into account previous information or commands
- H04W52/228—TPC being performed according to specific parameters taking into account previous information or commands using past power values or information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
Definitions
- the present invention relates to a wireless communication system, and more particularly to a wireless communication control technique in an environment where radio field intensity is attenuated due to weather conditions and a wireless communication apparatus using the wireless communication control technique.
- Radio wave intensity at frequencies above the microwave band is greatly affected by weather conditions such as rain, fog, and humidity, and it is known that the radio wave intensity is greatly attenuated by rain and snow, especially in the quasi-millimeter wave and millimeter wave bands above 10 GHz. ing.
- the relationship between the attenuation rate ⁇ R (dB / km) and the rainfall per hour R (mm / h) is expressed by the following equation (1).
- k and ⁇ are coefficients that depend on the frequency of the radio wave. Since attenuation of radio wave intensity caused by such weather conditions degrades the quality of the radio channel, various techniques for avoiding or suppressing this influence have been proposed.
- the wireless device disclosed in Patent Document 1 a sensor that acquires weather information such as rainfall, snowfall, and humidity is provided, and radio frequency and modulation are performed so as to achieve good communication quality according to the acquired weather information. Control the method. Further, the line bandwidth control device disclosed in Patent Document 2 predicts the rainfall intensity distribution and the moving speed from the rain information obtained in advance, and controls the line bandwidth so as to avoid the deterioration of the quality of the radio line.
- an object of the present invention is to provide a radio communication control method and apparatus and a radio communication apparatus that can appropriately control radio channel quality in response to weather changes without adding a special apparatus. .
- the wireless communication control device is based on the attenuation amount prediction means for predicting the future attenuation amount from the history of the attenuation amount of the radio field intensity from another wireless communication device to the wireless communication device, and the predicted attenuation amount.
- Control means for controlling the wireless communication device.
- the attenuation amount prediction means predicts the future attenuation amount from the history of the attenuation amount of the radio field intensity from another wireless communication device to the wireless communication device, and the control means predicts the predicted attenuation amount.
- the wireless communication device is controlled based on the amount.
- a wireless communication system is a wireless communication system including a wireless communication device and a wireless communication control device that controls the wireless communication device, from a history of attenuation of radio field intensity from other wireless communication devices to the wireless communication device.
- An attenuation amount prediction unit that predicts a future attenuation amount, and a control unit that controls the wireless communication device based on the predicted attenuation amount.
- a wireless communication device is a wireless communication device capable of wireless communication with another wireless communication device, and includes wireless communication means for performing wireless communication, and radio wave intensity from the other wireless communication device to the wireless communication device.
- An attenuation amount prediction unit that predicts a future attenuation amount from a history of attenuation amount, and a control unit that controls the wireless communication unit based on the predicted attenuation amount.
- a future attenuation value is predicted from a time-series radio field intensity attenuation amount, and wireless communication control is executed based on the predicted value, so that it is possible to cope with weather changes without adding a special device.
- Wireless channel quality can be controlled appropriately.
- FIG. 1 is a block diagram showing a schematic configuration of a radio communication control apparatus in a radio communication system according to a first embodiment of the present invention.
- FIG. 2 is a flowchart showing the radio communication control method according to the first embodiment.
- FIG. 3 is a block diagram showing a schematic configuration of a radio communication control apparatus in the radio communication system according to the second embodiment of the present invention.
- FIG. 4 is a flowchart showing a radio communication control method according to the second embodiment.
- FIG. 5 is a block diagram showing a schematic configuration of a radio communication control apparatus in the radio communication system according to the third embodiment of the present invention.
- FIG. 6 is a flowchart showing a wireless communication control method according to the third embodiment.
- FIG. 1 is a block diagram showing a schematic configuration of a radio communication control apparatus in a radio communication system according to a first embodiment of the present invention.
- FIG. 2 is a flowchart showing the radio communication control method according to the first embodiment.
- FIG. 3 is a block diagram
- FIG. 7 is a block diagram showing a schematic configuration of a radio communication control apparatus in a radio communication system according to the fourth embodiment of the present invention.
- FIG. 8 is a flowchart showing a wireless communication control method according to the fourth embodiment.
- FIG. 9 is a block diagram showing a schematic configuration of a radio communication control apparatus in a radio communication system according to the fifth embodiment of the present invention.
- FIG. 10 is a block diagram showing a schematic configuration of a radio communication control apparatus in a radio communication system according to the sixth embodiment of the present invention.
- FIG. 11 is a block diagram showing a schematic configuration of a radio communication control apparatus in a radio communication system according to the seventh embodiment of the present invention.
- a future attenuation value is predicted from the radio field intensity attenuation stored in time series, and wireless communication control is executed based on the predicted value. Since the future attenuation amount is predicted from the time-series attenuation amount up to now, it is possible to predict with high accuracy against a sudden weather change, and it is not necessary to add a special device, and the processing load is reduced.
- embodiments of the present invention will be described in detail with reference to the drawings.
- a wireless communication device 10 and a wireless communication device 11 perform wireless communication, and a wireless communication control device. 100 is assumed to control the wireless communication parameters (transmission power, modulation method, frequency band used, etc.) of the wireless communication device 10.
- Various weather conditions (rainfall, snowfall, humidity, etc.) that attenuate the radio field intensity are assumed between the wireless communication device 10 and the wireless communication device 11, and the presence or absence of precipitation including rainfall and snowfall will be considered below.
- the wireless communication control device 100 has a function of controlling the wireless communication parameters of the wireless communication device 10 and includes, as functional elements, an attenuation amount acquisition unit 101, a time series attenuation amount storage unit 102, an attenuation amount prediction unit 103, and a control unit 104.
- the control unit 104 controls the attenuation acquisition unit 101, the time-series attenuation storage unit 102, and the attenuation prediction unit 103 to optimize the wireless communication function of the wireless communication device 10 according to weather conditions. Control.
- the same functions as the attenuation amount acquisition unit 101, the attenuation amount prediction unit 103, and the control unit 104 may be realized by executing a program stored in a storage device (not shown) on a computer or a CPU (Central Processing Unit). it can.
- a storage device not shown
- CPU Central Processing Unit
- the attenuation amount acquisition unit 101 acquires the current attenuation amount A occurring between the wireless communication devices 10 and 11 at a predetermined period (operation S201).
- the sequentially acquired attenuation amount A is stored in time series in the time series attenuation amount storage unit 102 (operation S202).
- the attenuation amount A may be calculated from, for example, a transmission power value notified from the transmission side and a reception power measurement value on the reception side. If the transmission power value on the transmission side cannot be obtained, it can be estimated using a preset reception power reference value and reception power value in fine weather. That is, the attenuation amount A can be calculated as a difference from the attenuation value in fine weather. Radar information can also be used.
- the time-series attenuation amount A is simulated by radar information, and the simulation result is stored in the time-series attenuation storage unit 102. This simulation result may be used as training data for machine learning.
- the control unit 104 compares the acquired current attenuation amount A with a predetermined attenuation threshold value, and determines whether or not precipitation has occurred (operation S203). If the attenuation amount A exceeds the attenuation threshold value, it is determined that rain or snow is occurring between the wireless communication devices 10 and 11. If precipitation has occurred (operation S203; YES), the attenuation amount prediction unit 103 extracts a change in attenuation amount from the time series attenuation amount stored in the time series attenuation amount storage unit 102 according to the control of the control unit 104. Then, the attenuation amount Ae at the next acquisition time point or a future time point is predicted (operation S204).
- a machine learning method such as a neural network method can be used to extract the attenuation change.
- the control unit 104 optimally controls the wireless communication parameters of the wireless communication device 10 so as to maintain good communication according to the predicted attenuation amount Ae (operation S205). For example, it is possible to increase the transmission power of the wireless communication device 10 so as to reduce the predicted attenuation amount, or to switch to a frequency band or a modulation method in which attenuation due to precipitation becomes smaller. More specifically, communication quality indicators such as CNR (Carrier Noise Ratio), Eb / N0 (Energy per Bit to Noise power spectral density ratio), and BER (Bit Error Rate) are calculated and calculated. Based on the result, one or both of the modulation method and the used frequency are controlled. If the amount of attenuation is equal to or less than the attenuation threshold (operation S203; NO), it is determined that precipitation has not occurred, and the prediction of the amount of attenuation and the update of the wireless communication parameters are not performed.
- CNR Carrier Noise Ratio
- Eb / N0 Energy
- the radio wave intensity is attenuated in advance before the attenuation of the radio wave intensity due to a large weather change occurs.
- the wireless communication parameters of the communication device can be controlled, and communication failure can be avoided in advance.
- the wireless communication device 10 and the wireless communication device 11 are wireless. It is assumed that communication is performed and the wireless communication control device 100a controls wireless communication parameters (transmission power, modulation scheme, used frequency band, etc.) of the wireless communication device 10.
- the wireless communication device 10 and the wireless communication device 11 are separated from each other by a physical distance L, and various weather conditions (rainfall, snowfall, humidity, etc.) that attenuate the radio wave intensity are assumed between them. Consider the presence or absence of precipitation, including snowfall.
- the wireless communication control device 100a has a function of controlling wireless communication parameters of the wireless communication device 10, and includes as functional elements an attenuation / distance acquisition unit 101a, a time-series attenuation storage unit 102, an attenuation / precipitation prediction unit. 103 a and the control unit 104.
- the control unit 104 controls the attenuation / distance acquisition unit 101a, the time-series attenuation storage unit 102, and the attenuation / precipitation prediction unit 103a, and controls the wireless communication device 10 according to weather conditions. Optimum control of wireless communication functions.
- the same functions as the attenuation / distance acquisition unit 101a, the attenuation / precipitation prediction unit 103a, and the control unit 104 may be realized by executing a program stored in a storage device (not shown) on a computer or CPU. it can.
- the attenuation / distance acquisition unit 101 a calculates the physical distance L between the wireless communication devices 10 and 11 and the current attenuation A generated between the wireless communication devices 10 and 11. Acquired at a predetermined period, and stores the acquired attenuation amount and distance in the time-series attenuation amount storage unit 102 in time series (operation S301).
- the attenuation amount A may be calculated from, for example, the transmission power value notified from the transmission side and the reception power measurement value at the reception side. If the transmission power value on the transmission side cannot be obtained, it can be estimated using a preset reception power reference value and reception power value in fine weather. Radar information can also be used.
- the current rainfall rate R (mm / h) is calculated using equation (2) (operation S302).
- the control unit 104 compares the calculated rainfall rate R with a predetermined threshold value to determine whether or not precipitation has occurred (operation S303). If the rainfall rate R exceeds the threshold value, it is determined that rain or snow is occurring between the wireless communication devices 10 and 11. If precipitation has occurred (operation S303; YES), the attenuation amount / precipitation amount prediction unit 103a determines the attenuation amount from the time series attenuation amount stored in the time series attenuation amount storage unit 102 according to the control of the control unit 104. The change is extracted, and the attenuation amount Ae and the rainfall rate Re at the next acquisition time point or the future time point are predicted (operation S304).
- the control unit 104 optimally controls the wireless communication parameters of the wireless communication device 10 so as to maintain good communication according to the predicted attenuation amount Ae (operation S305). For example, it is possible to increase the transmission power of the wireless communication device 10 so as to reduce the predicted attenuation amount, or to switch to a frequency band or a modulation method in which attenuation due to precipitation becomes smaller. If the rainfall rate R is equal to or less than the threshold value (operation S303; NO), it is determined that precipitation has not occurred, and the attenuation amount and the rainfall rate are not predicted and the wireless communication parameters are not updated.
- the present embodiment predicts the future attenuation amount from the time-series attenuation amount up to now, and thus has the same effect as the first embodiment. It is also possible to calculate the precipitation rate and its predicted value using the target distance.
- a wireless communication control device 100b according to a third embodiment of the present invention adds a location information acquisition unit 105 to the wireless communication control device 100a according to the second embodiment. Have a configuration. Therefore, blocks having the same functions as those in FIG.
- the location information acquisition unit 105 acquires the geographical location information of the wireless communication devices 10 and 11.
- the geographical location of each radio can be measured in various ways. If the wireless communication devices 10 and 11 are both fixed, the longitude / latitude information of each installation location can be used. If either one of the wireless communication devices is a mobile station, the mobile station may be provided with a GPS (Global Positioning System) receiver, or from three or more nearest fixed wireless communication devices (base stations). The position may be specified using received radio waves.
- the position information of the wireless communication device 11 can be acquired by a position information acquisition unit provided in a wireless communication control device (not shown) connected to the wireless communication device 11.
- the wireless communication device 10 can receive the position information of the other wireless communication device 11 by a control message.
- the attenuation amount / distance acquisition unit 101 a includes the current geographical position information of the wireless communication devices 10 and 11 and the current attenuation amount A generated between the wireless communication devices 10 and 11. Are acquired in a predetermined cycle, and the acquired attenuation amount and position information are stored in the time-series attenuation amount storage unit 102 in time series (operation S401).
- the attenuation amount A may be calculated from, for example, the transmission power value notified from the transmission side and the reception power measurement value at the reception side. If the transmission power value on the transmission side cannot be obtained, it can be estimated using a preset reception power reference value and reception power value in fine weather. Radar information can also be used.
- the control unit 104 calculates the current physical distance L (km) between the radio communication devices 10 and 11 from the geographical position information, and uses the equation (2) as described in the second embodiment.
- the current rainfall rate R (mm / h) is calculated (operation S402).
- the control unit 104 compares the calculated rainfall rate R with a predetermined threshold value to determine whether or not precipitation has occurred (operation S403). If the rainfall rate R is equal to or less than the threshold (operation S403; NO), it is then determined whether or not the current position information of the wireless communication devices 10 and 11 has changed from the previous acquisition time (operation S404). If precipitation has occurred or if there is a change in position (operation S403; YES or operation S404; YES), the attenuation / precipitation prediction unit 103a stores the time-series attenuation storage unit 102 in accordance with the control of the control unit 104. A change in attenuation is extracted from the stored time-series attenuation, and an attenuation Ae and a rainfall rate Re at the next acquisition time or a future time are predicted (operation S405).
- the control unit 104 optimally controls the wireless communication parameters of the wireless communication device 10 so as to maintain good communication according to the predicted attenuation amount Ae (operation S406). For example, it is possible to increase the transmission power of the wireless communication device 10 so as to reduce the predicted attenuation amount, or to switch to a frequency band or a modulation method in which attenuation due to precipitation becomes smaller. If there is no precipitation and no change in position (operation S403; NO and operation S404; NO), the attenuation amount and the rainfall rate are not predicted and the wireless communication parameters are not updated.
- the present embodiment predicts the future attenuation amount from the time-series attenuation amount up to the present, and further uses the physical distance between the wireless communication devices to calculate the precipitation rate and its predicted value. Since calculation is also possible, it has the same effect as the second embodiment. Further, by recording the position information of the wireless communication devices 10 and 11 in time series, it is possible to detect a change in the position of both, and even when the wireless communication device moves, accurate wireless communication control according to weather conditions is possible. It becomes possible.
- a radio communication control apparatus 100c adds a communication network connection unit 106 to the radio communication control apparatus 100 according to the first embodiment. Have a configuration. Therefore, the blocks having the same functions as those in FIG.
- the communication network connection unit 106 is an interface with the communication network 20, and can communicate with another wireless communication control device 100 c and the management device 30 of the wireless communication system through the communication network 20. As will be described later, the wireless communication control device 100c can notify the other wireless communication control device or the management device 30 of the result predicted using the time-series attenuation amount.
- the communication network 20 is a packet communication network, for example.
- the same effect as that of the first embodiment can be obtained, and the other can be obtained by notifying the other wireless communication control device of the predicted attenuation amount.
- the wireless communication control device wireless control in consideration of the attenuation amount of other devices can be performed.
- a radio communication control apparatus 100d according to the fifth embodiment of the present invention has a configuration in which a communication network connection unit 106 according to the fourth embodiment is added to the radio communication control apparatus 100b according to the third embodiment. Since this embodiment is a combination of the functions described in the third and fourth embodiments, details are omitted.
- the functions of the wireless communication control device and the functions of the wireless communication device 10 according to the first to third embodiments described above are combined into one wireless communication device 600. It can also be included. That is, the wireless communication device 600 according to the present embodiment includes a wireless unit 601 for performing wireless communication with other wireless communication devices, and a wireless communication control unit 602 having the functions of the wireless communication control device according to the above embodiment.
- the function of the wireless communication control unit 602 is the same as that of the first embodiment, but may be the same as that of the wireless communication control devices 100a and 100b according to the second and third embodiments.
- the functions of the wireless communication control device and the function of the wireless communication device 10 according to the fourth and fifth embodiments described above are combined into one wireless communication device 600a. It can also be included. That is, the wireless communication device 600a according to the present embodiment includes a wireless unit 601 for performing wireless communication with other wireless communication devices, and a wireless communication control unit 602a having the same function as the wireless communication control device according to the above embodiment. . In FIG. 11, the function of the wireless communication control unit 602a is the same as that of the fourth embodiment, but may be the same as that of the wireless communication control device 100d according to the fifth embodiment.
- the wireless / weather condition monitoring apparatus 300 can collect the attenuation amount or the rainfall rate predicted from each wireless communication apparatus 600a, and can accurately determine the weather condition.
- a wireless communication control device for controlling a wireless communication device, Attenuation amount predicting means for predicting the future attenuation amount from the history of the attenuation amount of the radio field intensity from the other wireless communication device to the wireless communication device, Control means for controlling the wireless communication device based on the predicted attenuation amount;
- a wireless communication control device comprising: (Appendix 2) The control means determines the presence or absence of precipitation by comparing the latest attenuation amount and a precipitation threshold value, and when it is determined that there is precipitation, the attenuation amount prediction means predicts the future attenuation amount.
- the wireless communication control device according to Supplementary Note 1, wherein the wireless communication control device is characterized in that: (Appendix 3) The control means detects the latest precipitation situation based on the latest attenuation amount and the distance between the other wireless communication devices, and when it is determined that there is precipitation, the attenuation amount prediction means determines the future The wireless communication control device according to appendix 1, wherein an attenuation amount of the signal is predicted. (Appendix 4) The wireless communication control device according to appendix 3, wherein the attenuation amount prediction means predicts a future rainfall rate based on the predicted attenuation amount and a distance between the other wireless communication devices. .
- the control unit causes the attenuation amount prediction unit to predict the future attenuation amount when there is precipitation or when the relative position with the other wireless communication device changes.
- the wireless communication control device according to any one of the above. (Appendix 6) Any one of Supplementary notes 1-5, wherein the attenuation amount prediction means extracts a time-series change in attenuation amount from the attenuation amount history by a machine learning method, and predicts the future attenuation amount.
- a wireless communication control method for controlling a wireless communication device comprising: Attenuation amount predicting means predicts future attenuation amount from the history of attenuation amount of radio field intensity from other wireless communication devices to the wireless communication device, A control unit controls the wireless communication device based on the predicted attenuation amount; A wireless communication control method.
- the control means determines the presence or absence of precipitation by comparing the latest attenuation and the precipitation threshold, When it is determined that there is precipitation, the control unit causes the attenuation amount prediction unit to predict the future attenuation amount.
- the wireless communication control method according to appendix 7, wherein (Appendix 9)
- the control means detects the latest precipitation situation based on the latest attenuation and the distance between the other wireless communication devices, When it is determined that there is precipitation, the control unit causes the attenuation amount prediction unit to predict the future attenuation amount.
- the wireless communication control method according to appendix 7, wherein (Appendix 10)
- the wireless communication control according to appendix 9, wherein the attenuation amount prediction means predicts a future rainfall rate based on the predicted attenuation amount and a distance between the other wireless communication devices.
- the position acquisition means further comprises position acquisition means for acquiring geographical position information of the wireless communication device,
- the control means makes the attenuation prediction means predict the future attenuation when there is precipitation or when the relative position with the other wireless communication device changes;
- the wireless communication control method according to any one of appendices 8-10, wherein: (Appendix 12) Any one of appendixes 7-11, wherein the attenuation amount predicting means extracts a time-series change in attenuation amount from a history of the attenuation amount by a machine learning method and predicts the future attenuation amount.
- a wireless communication system including a wireless communication device and a wireless communication control device that controls the wireless communication device, Attenuation amount predicting means for predicting the future attenuation amount from the history of the attenuation amount of the radio field intensity from the other wireless communication device to the wireless communication device, Control means for controlling the wireless communication device based on the predicted attenuation amount;
- a wireless communication system comprising: (Appendix 14) The control means determines the presence or absence of precipitation by comparing the latest attenuation amount and a precipitation threshold value, and when it is determined that there is precipitation, the attenuation amount prediction means predicts the future attenuation amount. 14.
- the wireless communication system according to appendix 13, which is a feature.
- the control means detects the latest precipitation situation based on the latest attenuation amount and the distance between the other wireless communication devices, and when it is determined that there is precipitation, the attenuation amount prediction means determines the future 14.
- the wireless communication device further includes position acquisition means for acquiring geographical position information,
- the control unit causes the attenuation amount prediction unit to predict the future attenuation amount when there is precipitation or when the relative position with the other wireless communication device changes.
- the wireless communication system according to any one of the above.
- the wireless communication system according to any one of appendices 13 to 18, wherein the wireless communication device and the wireless communication control device are provided in one wireless communication device.
- Appendix 20 A communication network, and the wireless communication control device and the management device are connected to the communication network; 20.
- Appendix 21 A communication network, and the wireless communication control device and the management device are connected to the communication network;
- the wireless communication system according to supplementary note 16, wherein the wireless communication control device transmits the predicted attenuation amount and / or the predicted rainfall rate to the management device through the communication network.
- a wireless communication device capable of wireless communication with another wireless communication device, Wireless communication means for performing wireless communication; Attenuation amount predicting means for predicting a future attenuation amount from a history of attenuation amount of radio field intensity from the other wireless communication device to the wireless communication device, Control means for controlling the wireless communication means based on the predicted attenuation amount;
- a wireless communication apparatus comprising: (Appendix 23) A program for causing a computer to function as a wireless communication control device for controlling a wireless communication device, Attenuation amount prediction function for predicting future attenuation amount from a history of attenuation amount of radio field intensity from other wireless communication devices to the wireless communication device, A control function for controlling the wireless communication device based on the predicted attenuation amount; Is realized by the computer.
- the present invention can be applied to a wireless communication control technique in a wireless communication system in an environment where radio field intensity is attenuated due to weather conditions.
- Wireless communication device 10
- Communication network 30 Management device 100, 100a to 100d Wireless communication control device 101 Attenuation acquisition unit 101a Attenuation / distance acquisition unit 102 Time series attenuation storage unit 103 Attenuation prediction unit 103a Attenuation / precipitation Quantity prediction unit 104 Control unit 105 Position information acquisition unit 106 Communication network connection unit 300 Wireless / weather condition monitoring device 601 Radio units 602, 602a Wireless communication control unit
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Abstract
Description
ここでkおよびαは電波の周波数に依存する係数である。このような気象状況に起因する電波強度の減衰は無線回線品質を劣化させるために、この影響を回避あるいは抑制する技術が種々提案されている。
本発明による無線通信制御方法は、減衰量予測手段が他の無線通信機から前記無線通信機までの電波強度の減衰量の履歴から将来の減衰量を予測し、制御手段が前記予測された減衰量に基づいて前記無線通信機を制御する、ことを特徴とする。
本発明による無線通信システムは、無線通信機とそれを制御する無線通信制御装置とを含む無線通信システムであって、他の無線通信機から前記無線通信機までの電波強度の減衰量の履歴から将来の減衰量を予測する減衰量予測手段と、前記予測された減衰量に基づいて前記無線通信機を制御する制御手段と、を有することを特徴とする。
本発明による無線通信装置は、他の無線通信装置と無線通信可能な無線通信装置であって、無線通信を行う無線通信手段と、前記他の無線通信装置から当該無線通信装置までの電波強度の減衰量の履歴から将来の減衰量を予測する減衰量予測手段と、前記予測された減衰量に基づいて前記無線通信手段を制御する制御手段と、を有することを特徴とする。
本発明の実施形態によれば、時系列で格納した電波強度減衰量から将来の減衰値を予測し、その予測値に基づいて無線通信制御を実行する。現在までの時系列減衰量から将来の減衰量を予測するので、急激な気象変化に対して高精度の予測が可能となり、特別な装置を追加する必要はなく処理負荷も軽減される。以下、本発明の実施形態について、図面を参照しながら詳細に説明する。
1.1)システム構成
図1に示すように、本発明の第1実施形態による無線通信システムでは、無線通信機10と無線通信機11とが無線通信を行い、無線通信制御装置100が無線通信機10の無線通信パラメータ(送信電力、変調方式、使用周波数帯域など)を制御するものとする。
無線通信機10と無線通信機11との間には電波強度を減衰させる種々の気象状況(降雨、降雪、湿度など)が想定されるが、以下、降雨、降雪を含む降水の有無を考える。
図2において、減衰量取得部101は、無線通信機10および11の間で生じている現在の減衰量Aを所定周期で取得する(動作S201)。順次取得された減衰量Aは、時系列減衰量格納部102に時系列で格納される(動作S202)。なお、減衰量Aは、たとえば送信側から通知された送信電力値と受信側での受信電力測定値とから計算されてもよい。送信側の送信電力値が得られない場合には、予め設定された晴天時の受信電力基準値と受信電力値とを用いて推定することもできる。すなわち、減衰量Aは晴天時の減衰値との差として計算可能である。また、レーダ情報を利用することもできる。たとえば、レーダ情報により時系列の減衰量Aを模擬して、その模擬結果を時系列減衰量格納部102に格納する。この模擬結果は機械学習のトレーニングデータとして利用されてもよい。
上述したように、本実施形態によれば、現在までの時系列減衰量から将来の減衰量を予測するので、大きな気象変化による電波強度の減衰が発生する前に、予め無線通信機の無線通信パラメータを制御することができ、通信障害を未然に回避することができる。
2.1)システム構成
図3に示すように、本発明の第2実施形態による無線通信システムでは、第1実施形態と同様に、無線通信機10と無線通信機11とが無線通信を行い、無線通信制御装置100aが無線通信機10の無線通信パラメータ(送信電力、変調方式、使用周波数帯域など)を制御するものとする。無線通信機10と無線通信機11とは物理的距離Lだけ離れており、その間には電波強度を減衰させる種々の気象状況(降雨、降雪、湿度など)が想定されるが、以下、降雨、降雪を含む降水の有無を考える。
図4において、減衰量・距離取得部101aは、無線通信機10と11との物理的距離Lと無線通信機10および11の間で生じている現在の減衰量Aとを所定周期で取得し、取得された減衰量および距離を時系列減衰量格納部102に時系列で格納する(動作S301)。減衰量Aは、上述したように、たとえば送信側から通知された送信電力値と受信側での受信電力測定値とから計算されてもよい。送信側の送信電力値が得られない場合には、予め設定された晴天時の受信電力基準値と受信電力値とを用いて推定することもできる。また、レーダ情報を利用することもできる。
上述したように、本実施形態は、現在までの時系列減衰量から将来の減衰量を予測するので第1実施形態と同様の効果を有し、さらに無線通信機間の物理的距離を用いて降水率及びその予測値の算出も可能となる。
3.1)システム構成
図5に示すように、本発明の第3実施形態による無線通信制御装置100bは、第2実施形態による無線通信制御装置100aに位置情報取得部105を加えた構成を有する。したがって、図3と同じ機能を有するブロックには同一参照番号を付して詳細な説明は省略する。
図6において、減衰量・距離取得部101aは、無線通信機10および11の現在の地理的位置情報と無線通信機10および11の間で生じている現在の減衰量Aとを所定周期で取得し、取得された減衰量および位置情報を時系列減衰量格納部102に時系列で格納する(動作S401)。減衰量Aは、上述したように、たとえば送信側から通知された送信電力値と受信側での受信電力測定値とから計算されてもよい。送信側の送信電力値が得られない場合には、予め設定された晴天時の受信電力基準値と受信電力値とを用いて推定することもできる。また、レーダ情報を利用することもできる。
上述したように、本実施形態は、現在までの時系列減衰量から将来の減衰量を予測し、さらに無線通信機間の物理的距離を用いて降水率及びその予測値の算出も可能になるので、第2実施形態と同様の効果を有する。さらに無線通信機10および11の位置情報を時系列で記録することで、両者の位置変化を検出することができ、無線通信機が移動する場合でも、気象状況に応じた正確な無線通信制御が可能となる。
4.1)システム構成
図7に示すように、本発明の第4実施形態による無線通信制御装置100cは、第1実施形態による無線通信制御装置100に通信網接続部106を加えた構成を有する。したがって、図1と同じ機能を有するブロックには同一参照番号を付して詳細な説明は省略する。
図8における動作S501~S505は、図2における動作S201~S205と同じであるから説明は省略する。制御部104は、既に述べたように、予測減衰量Aeに応じて無線通信機10の無線通信パラメータを最適制御すると(動作S505)、その予測減衰量Aeを通信網接続部106を通して他の無線通信制御装置または管理装置30へ送信する(動作S506)。
上述したように、本実施形態によれば、第1実施形態と同様の効果を得ることができると共に、他の無線通信制御装置へ予測減衰量を通知することで、当該他の無線通信制御装置において他の装置の減衰量を考慮した無線制御が可能となる。
本発明は、上述した第1~第4実施形態に限定されるものではなく、以下に述べる実施形態も本発明に含まれる。
図9に示すように、本発明の第5実施形態による無線通信制御装置100dは、第3実施形態による無線通信制御装置100bに第4実施形態における通信網接続部106を加えた構成を有する。本実施形態は、上記第3および第4実施形態で説明した機能の組み合わせであるから詳細は省略する。
図10に示すように、本発明の第6実施形態によれば、上述した第1~第3実施形態による無線通信制御装置の機能と無線通信機10の機能とを一つの無線通信装置600に含むこともできる。すなわち、本実施形態による無線通信装置600は、他の無線通信装置と無線通信するための無線部601と、上記実施形態による無線通信制御装置の機能を有する無線通信制御部602と、を有する。図10において、無線通信制御部602の機能は第1実施形態と同じであるが、第2、第3実施形態による無線通信制御装置100a、100bと同じであってもよい。
図11に示すように、本発明の第7実施形態によれば、上述した第4、第5実施形態による無線通信制御装置の機能と無線通信機10の機能とを一つの無線通信装置600aに含むこともできる。すなわち、本実施形態による無線通信装置600aは、他の無線通信装置と無線通信するための無線部601と、上記実施形態による無線通信制御装置と同じ機能を有する無線通信制御部602aと、を有する。図11において、無線通信制御部602aの機能は第4実施形態と同じであるが、第5実施形態による無線通信制御装置100dと同じであってもよい。
上述した実施形態の一部あるいは全部は、以下の付記のようにも記載されうるが、これらに限定されるものではない。
(付記1)
無線通信機を制御する無線通信制御装置であって、
他の無線通信機から前記無線通信機までの電波強度の減衰量の履歴から将来の減衰量を予測する減衰量予測手段と、
前記予測された減衰量に基づいて前記無線通信機を制御する制御手段と、
を有することを特徴とする無線通信制御装置。
(付記2)
前記制御手段は、最新の減衰量と降水閾値とを比較することで降水の有無を判別し、降水があると判定されると、前記減衰量予測手段により前記将来の減衰量を予測させること
を特徴とする付記1に記載の無線通信制御装置。
(付記3)
前記制御手段は、最新の減衰量と前記他の無線通信機との間の距離とに基づいて最新の降水状況を検知し、降水があると判定されると、前記減衰量予測手段により前記将来の減衰量を予測させることを特徴とする付記1に記載の無線通信制御装置。
(付記4)
前記減衰量予測手段は、前記予測された減衰量と前記他の無線通信機との間の距離とに基づいて将来の降雨率を予測することを特徴とする付記3に記載の無線通信制御装置。
(付記5)
自機の地理上の位置情報を取得する位置取得手段を更に有し、
前記制御手段は、降水がある時または前記他の無線通信機との相対的な位置が変化した時、前記減衰量予測手段により前記将来の減衰量を予測させることを特徴とする付記2-4のいずれか1項に記載の無線通信制御装置。
(付記6)
前記減衰量予測手段は、前記減衰量の履歴から機械学習法により減衰量の時系列変化を抽出し、前記将来の減衰量を予測することを特徴とする付記1-5のいずれか1項に記載の無線通信制御装置。
(付記7)
無線通信機を制御する無線通信制御方法であって、
減衰量予測手段が他の無線通信機から前記無線通信機までの電波強度の減衰量の履歴から将来の減衰量を予測し、
制御手段が前記予測された減衰量に基づいて前記無線通信機を制御する、
ことを特徴とする無線通信制御方法。
(付記8)
前記制御手段が最新の減衰量と降水閾値とを比較することで降水の有無を判別し、
降水があると判定されると、前記制御手段が前記減衰量予測手段に前記将来の減衰量を予測させる、
ことを特徴とする付記7に記載の無線通信制御方法。
(付記9)
前記制御手段が最新の減衰量と前記他の無線通信機との間の距離とに基づいて最新の降水状況を検知し、
降水があると判定されると、前記制御手段が前記減衰量予測手段に前記将来の減衰量を予測させる、
ことを特徴とする付記7に記載の無線通信制御方法。
(付記10)
前記減衰量予測手段が、前記予測された減衰量と前記他の無線通信機との間の距離とに基づいて将来の降雨率を予測する、ことを特徴とする付記9に記載の無線通信制御方法。
(付記11)
位置取得手段が前記無線通信機の地理上の位置情報を取得する位置取得手段を更に有し、
前記制御手段が、降水がある時または前記他の無線通信機との相対的な位置が変化した時、前記減衰量予測手段により前記将来の減衰量を予測させる、
ことを特徴とする付記8-10のいずれか1項に記載の無線通信制御方法。
(付記12)
前記減衰量予測手段が、前記減衰量の履歴から機械学習法により減衰量の時系列変化を抽出し前記将来の減衰量を予測する、ことを特徴とする付記7-11のいずれか1項に記載の無線通信制御方法。
(付記13)
無線通信機とそれを制御する無線通信制御装置とを含む無線通信システムであって、
他の無線通信機から前記無線通信機までの電波強度の減衰量の履歴から将来の減衰量を予測する減衰量予測手段と、
前記予測された減衰量に基づいて前記無線通信機を制御する制御手段と、
を有することを特徴とする無線通信システム。
(付記14)
前記制御手段は、最新の減衰量と降水閾値とを比較することで降水の有無を判別し、降水があると判定されると、前記減衰量予測手段により前記将来の減衰量を予測させることを特徴とする付記13に記載の無線通信システム。
(付記15)
前記制御手段は、最新の減衰量と前記他の無線通信機との間の距離とに基づいて最新の降水状況を検知し、降水があると判定されると、前記減衰量予測手段により前記将来の減衰量を予測させることを特徴とする付記13に記載の無線通信システム。
(付記16)
前記減衰量予測手段は、前記予測された減衰量と前記他の無線通信機との間の距離とに基づいて将来の降雨率を予測することを特徴とする付記15に記載の無線通信システム。
(付記17)
前記無線通信機は地理上の位置情報を取得する位置取得手段を更に有し、
前記制御手段は、降水がある時または前記他の無線通信機との相対的な位置が変化した時、前記減衰量予測手段により前記将来の減衰量を予測させることを特徴とする付記14-16のいずれか1項に記載の無線通信システム。
(付記18)
前記減衰量予測手段は、前記減衰量の履歴から機械学習法により減衰量の時系列変化を抽出し、前記将来の減衰量を予測することを特徴とする付記13-17のいずれか1項に記載の無線通信システム。
(付記19)
前記無線通信機および前記無線通信制御装置がひとつの無線通信装置に設けられていることを特徴とする付記13-18のいずれか1項に記載の無線通信システム。
(付記20)
通信網を更に有し、前記通信網に前記無線通信制御装置および管理装置が接続されており、
前記無線通信制御装置が前記予測された減衰量を前記通信網を通して前記管理装置へ送信することを特徴とする付記13-19のいずれか1項に記載の無線通信システム。
(付記21)
通信網を更に有し、前記通信網に前記無線通信制御装置および管理装置が接続されており、
前記無線通信制御装置が前記予測された減衰量および/または前記予測された降雨率を前記通信網を通して前記管理装置へ送信することを特徴とする付記16に記載の無線通信システム。
(付記22)
他の無線通信装置と無線通信可能な無線通信装置であって、
無線通信を行う無線通信手段と、
前記他の無線通信装置から当該無線通信装置までの電波強度の減衰量の履歴から将来の減衰量を予測する減衰量予測手段と、
前記予測された減衰量に基づいて前記無線通信手段を制御する制御手段と、
を有することを特徴とする無線通信装置。
(付記23)
無線通信機を制御する無線通信制御装置としてコンピュータを機能させるためのプログラムであって、
他の無線通信機から前記無線通信機までの電波強度の減衰量の履歴から将来の減衰量を予測する減衰量予測機能と、
前記予測された減衰量に基づいて前記無線通信機を制御する制御機能と、
を前記コンピュータに実現させることを特徴とするプログラム。
20 通信網
30 管理装置
100、100a~100d 無線通信制御装置
101 減衰量取得部
101a 減衰量・距離取得部
102 時系列減衰量格納部
103 減衰量予測部
103a 減衰量・降水量予測部
104 制御部
105 位置情報取得部
106 通信網接続部
300 無線/気象状況監視装置
601 無線部
602、602a 無線通信制御部
Claims (10)
- 無線通信機を制御する無線通信制御装置であって、
他の無線通信機から前記無線通信機までの電波強度の減衰量の履歴から将来の減衰量を予測する減衰量予測手段と、
前記予測された減衰量に基づいて前記無線通信機を制御する制御手段と、
を有することを特徴とする無線通信制御装置。 - 前記制御手段は、最新の減衰量と降水閾値とを比較することで降水の有無を判別し、降水があると判定されると、前記減衰量予測手段により前記将来の減衰量を予測させることを特徴とする請求項1に記載の無線通信制御装置。
- 前記制御手段は、最新の減衰量と前記他の無線通信機との間の距離とに基づいて最新の降水状況を検知し、降水があると判定されると、前記減衰量予測手段により前記将来の減衰量を予測させることを特徴とする請求項1に記載の無線通信制御装置。
- 前記減衰量予測手段は、前記予測された減衰量と前記他の無線通信機との間の距離とに基づいて将来の降雨率を予測することを特徴とする請求項3に記載の無線通信制御装置。
- 前記無線通信機の地理上の位置情報を取得する位置取得手段を更に有し、
前記制御手段は、降水がある時または前記他の無線通信機との相対的な位置が変化した時、前記減衰量予測手段により前記将来の減衰量を予測させることを特徴とする請求項2-4のいずれか1項に記載の無線通信制御装置。 - 無線通信機を制御する無線通信制御方法であって、
減衰量予測手段が他の無線通信機から前記無線通信機までの電波強度の減衰量の履歴から将来の減衰量を予測し、
制御手段が前記予測された減衰量に基づいて前記無線通信機を制御する、
ことを特徴とする無線通信制御方法。 - 無線通信機とそれを制御する無線通信制御装置とを含む無線通信システムであって、
他の無線通信機から前記無線通信機までの電波強度の減衰量の履歴から将来の減衰量を予測する減衰量予測手段と、
前記予測された減衰量に基づいて前記無線通信機を制御する制御手段と、
を有することを特徴とする無線通信システム。 - 通信網を更に有し、前記通信網に前記無線通信制御装置および管理装置が接続されており、
前記無線通信制御装置が前記予測された減衰量を前記通信網を通して前記管理装置へ送信することを特徴とする請求項7に記載の無線通信システム。 - 他の無線通信装置と無線通信可能な無線通信装置であって、
無線通信を行う無線通信手段と、
前記他の無線通信装置から当該無線通信装置までの電波強度の減衰量の履歴から将来の減衰量を予測する減衰量予測手段と、
前記予測された減衰量に基づいて前記無線通信手段を制御する制御手段と、
を有することを特徴とする無線通信装置。 - 無線通信機を制御する無線通信制御装置としてコンピュータを機能させるためのプログラムを記録した記録媒体であって、
他の無線通信機から前記無線通信機までの電波強度の減衰量の履歴から将来の減衰量を予測する減衰量予測機能と、
前記予測された減衰量に基づいて前記無線通信機を制御する制御機能と、
を前記コンピュータに実現させることを特徴とするプログラムを記録した記録媒体。
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