JP2023135684A - Information processing device, program, system, and information processing method - Google Patents

Abstract

To improve a simulation accuracy of a propagation characteristic of a radio signal.SOLUTION: In a system including a flying object, an information processing device 300 comprises: a storage part that stores map information including a position and a formation of an object; an information reception part that receives transmission power information on a radio signal that is transmitted to a flying body flying in the sky by a communication terminal, reception power information by reception of the radio signal by the flying body, communication terminal position information when transmitting the radio signal by the communication terminal, and flying body position information when receiving the radio signal by the flying body; a propagation path determination part that determines a reflection propagation path including reflection of the radio signal by the object on the basis of the communication terminal position, the flying body position information, and the map information; a reception power determination part that determines a reflection propagation path reception power as a reception power with which the flying body has received the radio signal propagated through the reflection propagation path on the basis of the reception power information; and a reflection attenuation rate determination part that determines a reflection attenuation rate of the object on the basis of the transmission power information, the reflection propagation path reception power, and the reflection propagation path.SELECTED DRAWING: Figure 3

Description

The present invention relates to an information processing device, a program, a system, and an information processing method.

Patent Document 1 describes a radio field intensity estimating device that employs a simulation model using a ray tracing method as a theoretical model of radio wave propagation and calculates a simulated radio field intensity using this model.
[Prior art documents]
[Patent document]
[Patent Document 1] Japanese Patent Application Publication No. 2021-170738

According to one embodiment of the present invention, an information processing device is provided. The information processing device may include a storage unit that stores map information including object position information indicating the position of the object and object shape information indicating the shape of the object. The information processing device includes: transmission power information indicating the transmission power of a wireless signal transmitted by a communication terminal to an aircraft flying above; reception power information indicating reception power of the radio signal received by the aircraft; comprising an information receiving unit that receives communication terminal position information indicating the position when the communication terminal transmitted the radio signal and aircraft position information indicating the position when the aircraft received the radio signal. good. Based on the communication terminal position information, the aircraft position information, and the map information, the information processing device is configured to detect the wireless communication by the object before the radio signal propagates from the communication terminal to the aircraft. The apparatus may include a propagation path determining section that determines a reflected propagation path that is a propagation path that includes signal reflection. The information processing device determines a reflected propagation path received power, which is a received power at which the flying object received the wireless signal propagated on the reflected propagation path, based on the received power indicated by the received power information. It may include a determining section. The information processing device includes a return attenuation factor determining unit that determines a return attenuation factor of the object based on the transmission power indicated by the transmission power information, the reflected propagation path received power, and the reflected propagation path. It's fine.

The received power determination unit may determine the reflected propagation path received power based on the received power that is greater than a predetermined received power threshold. The storage unit corresponds to the communication terminal position information, the transmission power information, the reception power information, and indoor/outdoor information indicating whether the communication terminal transmitted the wireless signal outdoors or indoors. You can attach it and store it. The information processing device uses the plurality of communication terminal position information, the transmission power information, the reception power information, and the indoor/outdoor information stored in the storage unit as training data to control the communication terminal. a model generation unit that uses machine learning to generate an estimation model for estimating whether the communication terminal transmitted the wireless signal outdoors or indoors from the position information, the transmission power information, and the reception power information; You can prepare. The return loss factor determination unit uses the estimation model to determine the radio signal of the communication terminal that is estimated to have been transmitted outdoors, based on the communication terminal location information, the transmission power information, and the reception power information. The transmission power, the reflected propagation path received power determined by the received power determination unit based on the received power at which the flying object received the wireless signal, and the reflected propagation path are determined based on the reflected propagation path. The return loss coefficient may be determined. The propagation path determining unit may determine a reflection point that is a point on the reflective propagation path where the object reflects the wireless signal. The return attenuation factor determining unit may determine the return attenuation factor at the reflection point of the object.

The information receiving unit further transmits weather information indicating the weather in a predetermined range including the reflected propagation path when the communication terminal transmits the wireless signal or when the flying object receives the wireless signal. You may receive it. The return attenuation factor determining section may store the return attenuation factor of the object and the weather information in association with each other in the storage section. The return attenuation rate determination unit may determine the return attenuation rate of the object based on the reflection propagation path in which the weather indicated by the weather information satisfies a predetermined good weather condition. The information receiving unit is configured to receive the weather information including cloud amount information indicating the cloud amount in the range including the reflection propagation path when the communication terminal transmits the wireless signal or when the flying object receives the wireless signal. may be received. The return attenuation rate determination unit may determine the return attenuation rate of the object based on the reflection propagation path in which the cloud amount indicated by the cloud amount information included in the weather information is lower than a predetermined cloud amount threshold. .

The information receiving unit is configured to provide people flow information indicating the number of people in a predetermined range including the reflected propagation path when the communication terminal transmits the wireless signal or when the flying object receives the wireless signal. You may receive more. The return attenuation rate determination unit may determine the return attenuation rate of the object based on the reflection propagation path in which the number of people indicated by the people flow information is smaller than a predetermined people flow threshold. The information receiving unit is configured to detect a base station located in a predetermined range including the reflected propagation path when the communication terminal transmits the radio signal or when the flying object receives the radio signal. Communication amount information indicating the amount of communication may also be received. The return attenuation rate determination unit determines the return attenuation rate of the object based on the reflection propagation path in which the communication amount of the base station indicated by the communication amount information is lower than a predetermined communication amount threshold. good.

The information processing device places a base station in a predetermined range including the position of the object indicated by the object position information, based on the return attenuation coefficient of the object determined by the return attenuation rate determination unit. The base station may include a simulation unit that simulates propagation characteristics of a radio signal received from a communication terminal in the case where the base station receives the radio signal from the communication terminal. The information processing device may be mounted on the aircraft.

According to one embodiment of the present invention, a program for causing a computer to function as the information processing device is provided.

According to one embodiment of the invention, a system is provided. The system may include the information processing device. The system may include the air vehicle.

The flying vehicle may function as a stratospheric platform, form a wireless communication area by irradiating a beam, and provide wireless communication services to the communication terminals within the wireless communication area. The information processing device may include an information transmitter that transmits target area information indicating a target area including a target object whose return attenuation rate is to be determined to the flying object. The flying object transmits the communication information to the communication terminal located in a subcell including the target area indicated by the target area information received from the information processing device, out of a plurality of subcells forming the wireless communication area. An instruction may be given to transmit terminal location information.

According to one embodiment of the present invention, an information processing method executed by a computer is provided. The information processing method includes transmitting power information indicating the transmitting power of a wireless signal transmitted by a communication terminal to a flying object flying above, and receiving power information indicating receiving power at which the wireless signal is received by the flying object. comprising an information receiving step of receiving communication terminal position information indicating the position when the communication terminal transmitted the radio signal and aircraft position information indicating the position when the aircraft received the radio signal. good. The information processing method includes the communication terminal position information, the flying object position information, and map information stored in the computer that includes object position information indicating the position of the object and object shape information indicating the shape of the object. The method may include a propagation path determining step of determining a reflected propagation path that is a propagation path including reflection of the wireless signal by the object during the time the wireless signal propagates from the communication terminal to the flying object. . The information processing method includes: determining a reflected propagation path received power, which is a received power at which the flying object received the wireless signal propagated on the reflected propagation path, based on the received power indicated by the received power information; May include a decision stage. The information processing method includes a return attenuation factor determination step of determining a return attenuation factor of the object based on the transmission power indicated by the transmission power information, the reflected propagation path received power, and the reflected propagation path. It's fine.

Note that the above summary of the invention does not list all the necessary features of the invention. Furthermore, subcombinations of these features may also constitute inventions.

1 schematically depicts an example of a system 10; FIG. 3 is an explanatory diagram for explaining an example in which the information processing device 300 determines the return attenuation coefficient of an object. An example of the functional configuration of the information processing device 300 is schematically shown. FIG. 3 is an explanatory diagram for explaining an example in which the information processing device 300 determines a reflection propagation path whose return attenuation rate is to be determined. FIG. 7 is an explanatory diagram for explaining another example in which the information processing device 300 determines a reflection propagation path whose return attenuation rate is to be determined. FIG. 7 is an explanatory diagram for explaining another example in which the information processing device 300 determines a reflection propagation path whose return attenuation rate is to be determined. An example in which the aircraft 100 instructs the communication terminal 200 is schematically shown. FIG. 3 is an explanatory diagram for explaining an example of the flow of processing of the information processing device 300. An example of the hardware configuration of a computer 1200 functioning as an information processing device 300 is schematically shown.

When constructing a network (NW), the flow is to first calculate the propagation characteristics of a wireless signal by simulation when base stations are placed, and then to actually place the base stations. When base stations are actually placed using this flow, an error may occur between the wireless signal propagation characteristics calculated in the simulation and the wireless signal propagation characteristics calculated from the data actually measured by the actually placed base stations. It may be stored away. One of the causes of this error is due to the multipath phenomenon, in which the wireless signal transmitted by the transmitting device is reflected by an object such as a building, propagates through multiple propagation paths, and is received by the receiving device. Signal interference is an example of this. Therefore, in order to improve the accuracy of simulation of the propagation characteristics of wireless signals, it is necessary to accurately determine the influence of signal interference caused by multipath phenomena from the propagation characteristics of each of the multiple propagation paths through which the wireless signal propagated. There is a need. In order to determine the propagation characteristics of a propagation path that includes reflection of a wireless signal by an object among a plurality of propagation paths, the return loss rate of the object that reflected the wireless signal is required. Further, the return attenuation coefficient of an object differs depending on the material of the object. From the above, in order to improve the accuracy of simulation of the propagation characteristics of a radio signal, the accuracy of the return loss coefficient of an object existing in the propagation space of the radio signal is important. One method of determining the return loss coefficient of an object is to determine whether the wireless signal is received from the transmitting device based on the transmission result of the transmitting device transmitting the wireless signal and the reception result of the receiving device receiving the wireless signal. One method is to determine a propagation path that includes reflection of the wireless signal by an object before propagating to the side device, and determine the return attenuation rate of the object that reflected the wireless signal on the propagation path. However, as the number of propagation paths through which a wireless signal propagates from a transmitting device to a receiving device increases, it becomes more difficult to determine each propagation path with high precision. Furthermore, the more times a radio signal is reflected on a propagation path, the more difficult it becomes to accurately determine how much the radio signal has been attenuated due to reflection of the radio signal by a specific object. In the system 10 according to the present embodiment, for example, the information processing device transmits the transmission result of the communication terminal transmitting a measurement report (MR) to which position information of the communication terminal is attached, and an aircraft flying above. collects the reception result of receiving the MR. The information processing device uses the ray tracing method to determine the propagation path including reflections of the wireless signal by objects during the time the wireless signal propagates from the transmitting device to the receiving device, based on the collected transmission results and reception results. Determine the return loss rate of the object on which the wireless signal is reflected. This can contribute to improving the simulation accuracy of radio signal propagation characteristics.

Hereinafter, the present invention will be explained through embodiments of the invention, but the following embodiments do not limit the invention according to the claims. Furthermore, not all combinations of features described in the embodiments are essential to the solution of the invention.

FIG. 1 schematically depicts an example of a system 10. The system 10 may include an aircraft 100 and an information processing device 300. The system 10 may include a weather information management device 400. The system 10 may include a people flow information management device 500. The system 10 may include a base station management device 600.

Aircraft 100 provides wireless communication service to communication terminal 200. The flying object 100 is, for example, an unmanned aircraft. The flying object 100 is, for example, a flying object that functions as a stratospheric platform, forms a wireless communication area by irradiating a beam, and provides wireless communication services to the communication terminals 200 within the wireless communication area. The aircraft is, for example, a HAPS (High Altitude Platform Station). The flying object 100 may be a drone. Aircraft 100 may be a manned aircraft. In FIG. 1, an example in which the aircraft 100 is a HAPS will be mainly described.

The flying object 100 includes, for example, a main wing section 121, a main body section 122, a propeller 124, a solar panel 130, an SL (Service Link) antenna 132, and an FL (Feeder Link) antenna 134. A battery is disposed in at least one of the main wing section 121 and the main body section 122. The battery stores power generated by the solar panel 130. The main body 122 may include a control device 150 .

Control device 150 controls flying object 100 . The control device 150 causes the flying object 100 to fly by, for example, rotating the propeller 124 using electric power stored in a battery. The flying object 100 may fly under the control of the control device 150.

The control device 150 controls communication of the flying object 100, for example. The aircraft 100 may communicate under the control of the control device 150.

The flying object 100 forms a wireless communication area 140 by emitting a beam using the SL antenna 132, for example, and provides wireless communication services to the communication terminals 200 within the wireless communication area 140. The flying object 100 establishes a service link with the communication terminal 200 within the wireless communication area 140 using the SL antenna 132, for example. The aircraft 100 establishes a service link with the communication terminal 200 by, for example, radio wave communication. In this case, the frequency of the SL beam is, for example, in the microwave band. The frequency of the SL beam may be in the millimeter wave band. The aircraft 100 may establish a service link with the communication terminal 200 using optical wireless communication. In this case, the frequency of the SL beam is, for example, in the infrared light band.

SL antenna 132 is, for example, a multi-beam antenna. In this case, the wireless communication area 140 formed by the SL antenna 132 may be multi-cell.

The communication terminal 200 may be any communication terminal that can establish a service link with the aircraft 100. For example, the communication terminal 200 is a mobile phone such as a smartphone, a tablet terminal, a wearable terminal, or the like. Communication terminal 200 may be a PC (Personal Computer). Communication terminal 200 may be an IoT (Internet of Things) terminal. Communication terminal 200 may include anything that corresponds to IoE (Internet of Everything).

The aircraft 100 establishes a feeder link with the gateway 40 by emitting a beam using the FL antenna 134, for example. Aircraft 100 may access network 20 via gateway 40 with which it has established a feeder link.

Network 20 may include a core network provided by a carrier. The core network complies with, for example, a 5G (5th Generation) communication system. The core network may be based on a mobile communication system after the 6G (6th Generation) communication system. The core network may conform to a 3G (3rd Generation) communication system. The core network may be compliant with the Long Term Evolution (LTE) communication system. Network 20 may include the Internet.

For example, the flying object 100 covers an area on the ground to be covered while patrolling in the sky above the area. The flying object 100 may cover the entire ground area by flying over the ground area while covering a portion of the ground area to be covered by the wireless communication area 140.

The aircraft 100 acquires aircraft position information indicating the position of the aircraft 100, for example. The aircraft 100 uses, for example, a GNSS (Global Navigation Satellite System) function to acquire aircraft position information. The aircraft 100 uses, for example, a GPS (Global Positioning System) function to obtain aircraft position information. The aircraft 100 may acquire aircraft position information using an RTK (Real Time Kinematic) function.

The location information includes, for example, longitude information. The location information includes, for example, latitude information. The location information includes, for example, altitude information.

For example, the aircraft 100 transmits a transmission instruction to the communication terminal 200 within the wireless communication area 140 to instruct the communication terminal 200 to transmit a wireless signal to the aircraft 100. The aircraft 100 may receive the wireless signal transmitted by the communication terminal 200 according to the transmission instruction.

The transmission instruction includes, for example, instructing the communication terminal 200 to transmit a wireless signal with a predetermined configuration. The configuration includes, for example, transmitting a wireless signal with predetermined transmission power. The configuration includes, for example, transmitting a wireless signal at a predetermined frequency. The configuration includes, for example, when communication terminal position information indicating the position when the communication terminal 200 transmits the wireless signal can be acquired, transmitting the wireless signal with the communication terminal position information attached. The configuration includes, for example, adding transmission time information indicating the time when the communication terminal 200 transmits the wireless signal and transmitting the wireless signal. The configuration includes, for example, adding communication terminal movement speed information indicating the movement speed when the communication terminal 200 transmits the wireless signal and transmitting the wireless signal. The configuration may include transmitting the wireless signal with communication terminal movement direction information indicating the movement direction when the communication terminal 200 transmits the wireless signal.

The radio signal is, for example, an MR that reports the received signal quality of a reference signal (RS) transmitted by the flying object 100. The received signal quality includes, for example, received signal strength indicator (RSSI). Received signal quality includes, for example, signal-to-noise ratio (SNR), which is the ratio of signal power to noise power. Received signal quality may include a signal-to-interference-plus-noise ratio (SNIR), which is the ratio of signal power to the sum of noise power and interference power.

For example, when the radio signal received from the communication terminal 200 is propagating through a plurality of propagation paths, the aircraft 100 decomposes the radio signal received from the communication terminal 200 into the radio signals propagated on each propagation path. For example, based on the phase of the radio signal received from the communication terminal 200, the aircraft 100 decomposes the radio signal received from the communication terminal 200 into radio signals propagated on respective propagation paths. For example, based on the frequency of the radio signal received from the communication terminal 200, the aircraft 100 decomposes the radio signal received from the communication terminal 200 into radio signals propagated on respective propagation paths. For example, the flying object 100 determines the Doppler shift due to the movement of the communication terminal 200 from the movement speed and movement direction of the communication terminal 200 when the communication terminal 200 transmits the wireless signal, and based on the determined Doppler shift, the communication terminal The radio signal received from 200 is decomposed into radio signals propagated through respective propagation paths. The flying object 100 determines the Doppler shift due to the movement of the flying object 100 from the moving speed and moving direction of the flying object 100 when the flying object 100 receives the radio signal, and transmits information from the communication terminal 200 based on the determined Doppler shift. The received radio signal may be decomposed into radio signals propagated through respective propagation paths.

The aircraft 100 uses, for example, a blind signal separation method to decompose the radio signal received from the communication terminal 200 into radio signals propagated on respective propagation paths. For example, the flying object 100 performs a Fourier transform on the radio signal received from the communication terminal 200 to decompose it into radio signals propagated on respective propagation paths. The aircraft 100 may use any other method to decompose the radio signal received from the communication terminal 200 into radio signals propagated on respective propagation paths.

The flying object 100 receives, for example, the transmission result of the communication terminal 200 transmitting a wireless signal to the flying object 100 flying above the network 20, and the reception result of the flying object 100 receiving the wireless signal from the communication terminal 200. Send. When the wireless signal received from the communication terminal 200 is propagating through a plurality of propagation paths, the aircraft 100 may transmit the reception result for the wireless signal propagated through each propagation path.

For example, the flying object 100 transmits the results of the wireless signal transmission by the communication terminal 200 and the receiving results of the wireless signal by the flying object 100 to the information processing device 300. The flying object 100 may transmit the results of the wireless signal transmission by the communication terminal 200 and the receiving results of the wireless signal by the flying object 100 to the flying object management device that manages the flying object 100.

The transmission result includes, for example, transmission power information indicating the transmission power of the wireless signal transmitted by communication terminal 200. The transmission result includes, for example, transmission frequency information indicating the frequency of the wireless signal transmitted by communication terminal 200. The transmission result includes, for example, transmission time information indicating the time when communication terminal 200 transmitted the wireless signal. The transmission result includes, for example, communication terminal position information indicating the position when communication terminal 200 transmitted the wireless signal. The transmission result includes, for example, communication terminal movement speed information indicating the movement speed at which communication terminal 200 transmitted the wireless signal. The transmission result may include communication terminal movement direction information indicating the movement direction when communication terminal 200 transmitted the wireless signal.

The reception result includes, for example, received power information indicating the received power of the radio signal received by the aircraft 100. For example, when the radio signal propagates on multiple propagation paths, the reception result includes total received power information indicating the total received power of the radio signals received by the aircraft 100 and propagated on each propagation path. The total received power may be an example of received power. The reception result includes, for example, reception frequency information indicating the frequency of the radio signal received by the aircraft 100. The reception result includes, for example, phase information indicating the phase of the radio signal received by the aircraft 100. The reception result includes, for example, wavelength information indicating the wavelength of the radio signal received by the aircraft 100. The reception result includes, for example, reception time information indicating the time when the flying object 100 received the radio signal. The reception result includes, for example, aircraft position information indicating the position of the aircraft 100 when the radio signal was received. The reception result includes, for example, flying object moving speed information indicating the moving speed of the flying object 100 when the wireless signal was received. The reception result may include flying object movement direction information indicating the moving direction when the flying object 100 received the radio signal.

Information processing device 300 determines a propagation path of a wireless signal. For example, the information processing device 300 determines the propagation distance of the radio signal propagation path. For example, the information processing device 300 determines the propagation direction of the propagation path of the wireless signal.

Information processing device 300 determines, for example, a propagation path for a wireless signal to propagate from communication terminal 200 to aircraft 100. The information processing device 300 receives, for example, the results of the transmission of the radio signal by the communication terminal 200 and the reception result of the radio signal by the aircraft 100, which are received from the aircraft 100 via the network 20, and the object position information indicating the position of the object. A propagation path is determined based on map information including object shape information indicating the shape of the object. Objects include, for example, buildings such as buildings and residences. Objects include, for example, information display devices such as billboards and road signs. Objects may include natural objects such as trees and rocks.

For example, the information processing device 300 regards the electromagnetic waves radiated from the transmission point as rays, and geometrically traces the rays that reach the reception point from the transmission point. The propagation path of the wireless signal is determined using a ray tracing method that determines the propagation path that propagates to the receiving point. Information processing device 300 may determine the propagation path of the wireless signal using any other method.

The propagation path includes, for example, a direct propagation path that is a propagation path that does not include reflection by an object while the wireless signal propagates from the communication terminal 200 to the aircraft 100. The propagation path includes, for example, a reflected propagation path that is a propagation path that includes reflection of the wireless signal by an object before the wireless signal propagates from the communication terminal 200 to the aircraft 100. In the example shown in FIG. 1, a wireless signal propagates from a communication terminal 200 to an aircraft 100 via a direct propagation path 210 and a reflected propagation path 220 that includes reflection of the wireless signal by a building 50.

Based on the received power of the radio signal received by the aircraft 100 indicated by the received power information, the information processing device 300 determines the reflected propagation path reception which is the received power at which the aircraft 100 received the radio signal propagated on the reflected propagation path. Determine power. Based on the received power of the radio signal received by the aircraft 100 indicated by the received power information, the information processing device 300 determines the direct propagation path reception which is the received power at which the aircraft 100 received the radio signal propagated on the direct propagation path. The power may be determined. In the example shown in FIG. 1, the information processing device 300 determines the reflected propagation path received power of the radio signal propagated by the flying object 100 along the reflected propagation path 220.

For example, the information processing device 300 determines the return attenuation rate of an object that reflects the wireless signal on the reflection propagation path. In the example of FIG. 1, the information processing device 300 calculates, for example, the transmission power of the wireless signal transmitted by the communication terminal 200 indicated by the transmission power information, and the reflected propagation path of the wireless signal propagated by the flying object 100 along the reflected propagation path 220. Based on the received power and the reflected propagation path 220, the return loss rate of the building 50 that reflected the wireless signal on the reflected propagation path 220 is determined.

The reflectance of the object is 1-(reflection attenuation factor of the object). Therefore, the information processing device 300 determining the return attenuation factor of the object may include the information processing device 300 determining the reflectance of the object.

The information processing device 300 is placed on the ground, for example. Information processing device 300 may be mounted on aircraft 100.

Weather information management device 400 manages weather information indicating the weather. The weather information includes, for example, cloud amount information indicating the amount of clouds, which is the ratio of clouds occupying a predetermined range of space. The weather information includes, for example, rainfall information indicating the amount of rainfall. The weather information includes, for example, snowfall amount information indicating the amount of snowfall. The weather information includes, for example, temperature information indicating the temperature. The weather information may include humidity information indicating humidity. The information processing device 300 receives weather information in a predetermined range including the reflected propagation path from the weather information management device 400, for example, via the network 20.

The people flow information management device 500 manages people flow information indicating the number of people at a predetermined time. The information processing device 300 receives, for example, people flow information in a predetermined range including the reflected propagation path from the people flow information management device 500 via the network 20.

Base station management device 600 manages base stations. The base station management device 600 manages, for example, base stations located on the ground. The base station management device 600 may manage base stations mounted on an aircraft. The information processing device 300 receives, for example, traffic information indicating the traffic of base stations located in a predetermined range including the reflected propagation path from the base station management device 600 via the network 20.

When constructing a network, the flow is to first calculate the propagation characteristics of wireless signals when base stations are placed through simulation, and then to actually place the base stations. When base stations are actually placed using this flow, an error may occur between the wireless signal propagation characteristics calculated in the simulation and the wireless signal propagation characteristics calculated from the data actually measured by the actually placed base stations. It may be stored away. One of the causes of this error is due to the multipath phenomenon, in which the wireless signal transmitted by the transmitting device is reflected by an object such as a building, propagates through multiple propagation paths, and is received by the receiving device. Signal interference is an example of this. In particular, when the frequency of the wireless signal is high, the influence of signal interference caused by multipath phenomena becomes large. Therefore, in order to improve the accuracy of simulation of the propagation characteristics of wireless signals, it is necessary to accurately determine the influence of signal interference caused by multipath phenomena from the propagation characteristics of each of the multiple propagation paths through which the wireless signal propagated. There is a need. In order to determine the propagation characteristics of a propagation path that includes reflection of a wireless signal by an object among a plurality of propagation paths, the return loss rate of the object that reflected the wireless signal is required. Further, the return attenuation coefficient of an object differs depending on the material of the object. From the above, in order to improve the accuracy of simulation of the propagation characteristics of a radio signal, the accuracy of the return loss coefficient of an object existing in the propagation space of the radio signal is important.

One method of determining the return loss coefficient of an object is to determine whether the wireless signal is received from the transmitting device based on the transmission result of the transmitting device transmitting the wireless signal and the reception result of the receiving device receiving the wireless signal. One method is to determine a propagation path that includes reflection of the wireless signal by an object before propagating to the side device, and determine the return attenuation rate of the object that reflected the wireless signal on the propagation path. In conventional systems, the communication terminal is the transmitting device and the terrestrial base station is the receiving device, and reflections of the radio signal by objects are included during the time the wireless signal propagates from the communication terminal to the terrestrial base station. The return loss rate of objects that reflected radio signals along the propagation path was determined. However, since the height difference between the height of the receiving antenna of the ground base station and the height of the object is small, when the ground base station is used as the receiving device, the wireless signal propagates from the communication terminal to the ground base station. There is a high possibility that the radio signal will be reflected by multiple objects during that time. In particular, when wireless signals propagate through areas with dense buildings such as urban areas or residential areas, the wireless signals may be reflected by multiple objects while propagating from the communication terminal to the base station on the ground. The possibility of this happening becomes even higher. Furthermore, since the receiving antenna of a terrestrial base station is located at a low altitude from the ground, when a terrestrial base station is used as a receiving device, the radio signal is is likely to be reflected by the ground. The more likely a radio signal is to be reflected during its journey from the sending device to the receiving device, the more paths the radio signal has to propagate from the sending device to the receiving device. Probability is high. As the number of propagation paths increases, it becomes more difficult to determine each propagation path with high precision. Furthermore, the more times a radio signal is reflected on a propagation path, the more difficult it becomes to accurately determine how much the radio signal has been attenuated due to reflection of the radio signal by a specific object. Therefore, in conventional systems in which a terrestrial base station is used as a receiving device, it may not be possible to accurately determine the return loss coefficient of an object existing in a radio signal propagation space.

On the other hand, according to the system 10 according to the present embodiment, the information processing device 300 uses the communication terminal 200 as a transmitting device and the flying object 100 flying in the sky as a receiving device, and uses the reflected propagation path Determine the return loss rate of the object that reflected the radio signal at . The height difference between the height of the receiving antenna of the flying object 100 flying in the sky and the height of the object is large compared to the height difference between the height of the receiving antenna of the base station on the ground and the height of the object. . In particular, when the flying object 100 flying in the sky is a HAPS flying in the stratosphere, the altitude difference between the altitude of the SL antenna 132 and the altitude of the object is the same as the altitude of the receiving antenna of the base station on the ground. The height difference between the height of the object and the height of the object is significantly larger. Therefore, when the receiving device is an aircraft 100 flying in the sky, there is a low possibility that the radio signal will be reflected by multiple objects before it propagates from the communication terminal 200 to the aircraft 100. , is lower than when a wireless signal propagates from a communication terminal to a base station on the ground. Furthermore, the altitude from the ground of the receiving antenna of the flying object 100 flying in the sky is higher than the altitude from the ground of the receiving antenna of the base station on the ground. In particular, when the flying object 100 flying in the sky is a HAPS flying in the stratosphere, the altitude of the SL antenna 132 from the ground is significantly higher than the altitude of the receiving antenna of the ground base station from the ground. expensive. Therefore, when the receiving device is an aircraft 100 flying in the sky, the possibility that the radio signal is reflected by the ground during propagation from the communication terminal 200 to the aircraft 100 is less than This is lower than when the signal propagates from the communication terminal to the base station on the ground. Therefore, when the receiving device is the flying object 100 flying in the sky, the information processing device 300 selects the wireless signal from among the small number of propagation paths through which the wireless signal propagates from the communication terminal 200 to the flying object 100. It is possible to determine a reflection propagation path in which the number of reflections is small. Thereby, the system 10 according to the present embodiment can determine the return attenuation coefficient of an object existing in the radio signal propagation space with high accuracy, and can contribute to improving the simulation accuracy of the radio signal propagation characteristics. In particular, when the receiving device is a HAPS flying in the stratosphere, the HAPS can stay in the air at a fixed point for a long period of time, so it is possible to more stably acquire data on the return loss coefficient of an object. Thereby, it is possible to reliably obtain data on the return attenuation coefficient of an object when the weather is fine. Also, for example, data on the return attenuation coefficient of an object depending on the weather condition, such as data on the return attenuation coefficient of the object when the weather is good or data on the return attenuation coefficient of the object when the weather is bad. It is also possible to obtain

FIG. 2 is an explanatory diagram for explaining an example in which the information processing device 300 determines the return attenuation coefficient of an object. In FIG. 2, an example in which the information processing device 300 determines the return attenuation factor of the building 50 on the reflection propagation path 220 will be mainly described.

For example, the information processing device 300 receives from the aircraft 100 based on the communication terminal position information when the communication terminal 200 transmits the radio signal and the aircraft position information when the aircraft 100 receives the radio signal. The propagation distance of the reflected propagation path 220 is determined. As shown in FIG. 2, the propagation distance from the position of the communication terminal 200 when the communication terminal 200 transmits the wireless signal to the reflection point, which is the point at which the building 50 reflected the wireless signal, is _d1 , and the reflection point The propagation distance from to the position of the aircraft 100 when the aircraft 100 receives the radio signal is _d2 . Therefore, the propagation distance of the reflected propagation path 220 is d ₁ +d ₂ .

The information processing device 300 calculates, for example, the transmission power _Pt of the wireless signal transmitted by the communication terminal 200 indicated by the transmission power information, and the reflected propagation path received power on which the flying object 100 received the wireless signal propagated on the reflected propagation path 220. Based on P _r and the propagation distance d ₁ +d ₂ of the reflection propagation path 220, the reflection attenuation factor γ of the building 50 is calculated from Equation 1 below. Note that in Equation 1 below, λ is the wavelength of the wireless signal.

[Formula 1]

FIG. 3 schematically shows an example of the functional configuration of the information processing device 300. The information processing device 300 includes a storage section 302, an information transmission section 304, an information reception section 306, a propagation path determination section 308, a received power determination section 310, a return loss factor determination section 312, a model generation section 314, and a simulation section 316. . Note that it is not necessarily necessary for the information processing device 300 to have all of these configurations.

The storage unit 302 stores various information. The storage unit 302 stores, for example, map information.

The storage unit 302 stores, for example, the return attenuation coefficient of an object included in the map information. For example, if the information processing device 300 has not determined the return attenuation coefficient of the object, the return attenuation coefficient of the object is set to a default value. The default value is, for example, 0.

The storage unit 302 stores, for example, target area information indicating a target area including a target object whose return attenuation rate is to be determined. The target object includes, for example, an object whose return attenuation rate has not been determined by the information processing device 300. The target object may include an object for which a predetermined period of time has passed since the information processing device 300 last determined the return attenuation coefficient. The storage unit 302 stores, for example, a predetermined received power threshold.

The storage unit 302 may store predetermined propagation path conditions. The propagation path condition includes, for example, that the number of times the wireless signal is reflected on the reflective propagation path is less than a predetermined number of times. The predetermined number of times is, for example, two times. The predetermined number of times may be more than two times.

The propagation path condition includes that the weather in a predetermined range including the reflected propagation path satisfies a predetermined good weather condition. The good weather condition includes, for example, that the amount of clouds in a predetermined range including the reflection propagation path is lower than a predetermined cloud amount threshold. The good weather condition includes, for example, that the amount of rainfall in a predetermined range including the reflection propagation path is lower than a predetermined rainfall amount threshold. The good weather condition includes, for example, that the amount of snowfall in a predetermined range including the reflection propagation path is lower than a predetermined snowfall amount threshold. The good weather condition includes, for example, that the temperature in a predetermined range including the reflection propagation path is included in a predetermined temperature region. The favorable weather conditions may include the humidity in the predetermined range including the reflection propagation path being lower than a predetermined humidity threshold.

The propagation path condition may include that the number of people in a predetermined range including the reflected propagation path is less than a predetermined people flow threshold. The propagation path condition may include that the amount of communication of a base station located in a predetermined range including the reflected propagation path is lower than a predetermined amount of communication threshold.

Information transmitting section 304 transmits various information. The information transmitting unit 304 transmits various information via the network 20, for example.

The information transmitter 304 transmits various information to the aircraft 100, for example. The information transmitting unit 304 transmits a transmission instruction to the aircraft 100, for example. The aircraft 100 may transmit the transmission instruction received from the information processing device 300 to the communication terminal 200 within the wireless communication area 140. The information transmitter 304 may transmit target area information to the aircraft 100. The information transmitter 304 may transmit the same information as the information transmitted to the aircraft 100 to the aircraft management device.

Information receiving section 306 receives various information. The information receiving unit 306 receives various information via the network 20, for example.

The information receiving unit 306 receives, for example, from the aircraft 100 the results of the transmission of the radio signal by the communication terminal 200 and the results of the reception of the radio signal by the aircraft 100. The information receiving unit 306 may receive, for example, the results of the transmission of the radio signal by the communication terminal 200 and the results of the reception of the radio signal by the aircraft 100 from an aircraft management device that manages the aircraft 100. The information receiving unit 306 may store the received result of the wireless signal transmitted by the communication terminal 200 and the received result of the wireless signal by the aircraft 100 in the storage unit 302.

Propagation path determining section 308 determines the propagation path of the wireless signal. The propagation path determining unit 308 determines, for example, a propagation path of a wireless signal transmitted by the communication terminal 200, which propagates from the communication terminal 200 to the aircraft 100 flying in the sky.

For example, the propagation path determining unit 308 determines the result of transmitting a wireless signal by the communication terminal 200 whose propagation path is to be determined, based on the result of transmitting the wireless signal by the communication terminal 200 stored in the storage unit 302. . For example, the propagation path determining unit 308 determines, among the results of the transmission of the wireless signal by the communication terminal 200, the transmission of the wireless signal by the communication terminal 200, which includes the communication terminal position information of the communication terminal 200 when the communication terminal 200 transmitted the wireless signal. The result is used to determine the propagation path.

The propagation route determining unit 308 determines the propagation route of the communication based on the communication terminal position information of the communication terminal 200 when the communication terminal 200 transmits the wireless signal and the map information stored in the storage unit 302. The result of transmitting a wireless signal by the terminal 200 may also be determined. For example, the propagation path determination unit 308 determines, among the results of wireless signal transmission by the communication terminal 200, the position of the communication terminal 200 at the time of transmitting the wireless signal indicated by the communication terminal position information, and the object position information included in the map information. The transmission result of a wireless signal by the communication terminal 200 whose distance from the position of the communication terminal 200 to the position of the nearest building indicated by is longer than a predetermined distance threshold is the target for determining the propagation route.

The propagation path determining unit 308 uses, for example, the communication terminal position information of the communication terminal 200 when the communication terminal 200 transmits the radio signal, which is stored in the storage unit 302, and the communication terminal position information when the aircraft 100 receives the radio signal. A propagation route is determined based on the aircraft position information of the aircraft 100 and the map information. Propagation route determining section 308 determines a propagation route based on, for example, communication terminal position information of communication terminal 200 when communication terminal 200, which is a target for determining the propagation route, transmits a wireless signal.

The propagation path determination unit 308 determines the propagation path of the wireless signal using, for example, a ray tracing method. The propagation path determination unit 308 may determine the propagation path of the wireless signal using any other method.

The propagation path determination unit 308 determines, for example, a reflected propagation path along which the wireless signal propagates from the communication terminal 200 to the aircraft 100. In this case, the propagation path determination unit 308 may determine a reflection point where an object on the reflected propagation path reflects the wireless signal. The propagation path determining unit 308 may determine a direct propagation path along which the wireless signal propagates from the communication terminal 200 to the aircraft 100.

The propagation route determining unit 308 stores the determined reflected propagation route of the radio signal as reflected propagation route information in the storage unit 302 in association with the result of transmitting the radio signal by the communication terminal 200 and the result of receiving the radio signal by the aircraft 100. You may do so. The propagation route determining unit 308 stores the determined direct propagation route of the wireless signal as direct propagation route information in the storage unit 302 in association with the result of transmitting the wireless signal by the communication terminal 200 and the result of receiving the wireless signal by the aircraft 100. You may.

For example, the information receiving unit 306 receives from the weather information management device 400 the reflected propagation path determined by the propagation path determining unit 308 when the communication terminal 200 transmits the wireless signal or when the aircraft 100 receives the wireless signal. receive weather information of a predetermined range including; For example, the information receiving unit 306 determines the flow of people in a predetermined range including the reflected propagation path when the communication terminal 200 transmits a wireless signal or when the aircraft 100 receives a wireless signal from the people flow information management device 500. Receive information. The information receiving unit 306 receives information from the base station management device 600 in a predetermined range including the reflected propagation path when the communication terminal 200 transmits a wireless signal or when the aircraft 100 receives a wireless signal. The communication amount information of the base station may be received. When a plurality of base stations are arranged in a predetermined range including the reflected propagation path, the information receiving unit 306 may receive communication amount information of each of the plurality of base stations.

The received power determining unit 310 determines the reflected propagation path received power when the aircraft 100 receives the radio signal propagated on the reflected propagation path determined by the propagation path determining unit 308. For example, the received power determining unit 310 determines the received power of the reflected propagation path based on the received result of the wireless signal by the flying object 100 stored in the storage unit 302. Determine. For example, among the reception results of the radio signal by the aircraft 100, the reception power determination unit 310 sets the reception power of the radio signal received by the aircraft 100 indicated by the reception power information to a reception power threshold value stored in the storage unit 302. The reception result of the radio signal by the larger flying object 100 is used as the target for determining the reflected propagation path received power. For example, when the reception result of the radio signal by the aircraft 100 is the reception result of the radio signal propagated through a plurality of propagation paths, the reception power determination unit 310 determines the total received power of the reception result of the radio signal by the aircraft 100. The results of reception of radio signals by the aircraft 100 in which the total received power of the radio signals received by the aircraft 100 indicated by the information is greater than the reception power threshold may be used as targets for determining the reflected propagation path received power.

For example, the received power determining unit 310 determines the received power of the reflected propagation path where the flying object 100 received the wireless signal propagated on the reflected propagation path, based on the received power of the wireless signal received by the flying object 100 indicated by the received power information. Determine. For example, the received power determination unit 310 determines the reflected propagation path received power on which the flying object 100 receives the radio signal propagated on the reflected propagation path, based on the received power that is larger than the received power threshold. For example, the received power determination unit 310 determines the reflected propagation path received power on which the flying object 100 receives the radio signal propagated on the reflected propagation path, based on each received power of the total received power that is larger than the received power threshold. The received power determining unit 310 stores the determined reflected propagation path received power in the storage unit 302 in association with the result of transmitting the wireless signal by the communication terminal 200 and the result of receiving the wireless signal by the aircraft 100 as reflected propagation path received power information. May be stored.

For example, the received power determining unit 310 determines the received power of the radio signal received by the flying object 100 indicated by the received power information as the reflected propagation path received power. For example, when the reception result of a radio signal by the aircraft 100 is a reception result of a radio signal propagated through a plurality of propagation paths, the received power determination section 310 determines the propagation distance of the reflected propagation path determined by the propagation path determination section 308. Based on this, the phase of the wireless signal propagated through the reflected propagation path is determined. The received power determining unit 310 determines a wireless signal having a phase corresponding to the determined phase from the phase indicated by the phase information of each wireless signal propagated on each propagation path. The received power determining unit 310 determines the received power at which the flying object 100 receives the wireless signal, which is indicated by the determined received power information of the wireless signal, as the reflected propagation path received power.

The received power determining unit 310 may determine the direct propagation path received power at which the flying object 100 receives the wireless signal propagated through the direct propagation path. The received power determination unit 310 may determine the direct propagation path received power in the same manner as in determining the reflected propagation path received power. The received power determining unit 310 stores the determined direct propagation path received power in the storage unit 302 in association with the results of transmitting the wireless signal by the communication terminal 200 and the results of receiving the wireless signal by the aircraft 100 as direct propagation path received power information. May be stored.

The return attenuation factor determination unit 312 determines the return attenuation rate of the object that reflected the wireless signal on the reflection propagation path determined by the propagation path determination unit 308. The return loss rate determining unit 312 determines, for example, the transmission power of the wireless signal transmitted by the communication terminal 200, which is indicated by the transmission power information included in the transmission result of the wireless signal by the communication terminal 200, which is stored in the storage unit 302; Based on the reflected propagation path received power determined by the received power determination unit 310 and the reflected propagation path, the return attenuation factor of the object that reflected the wireless signal on the reflected propagation path is determined. For example, the return attenuation factor determination unit 312 determines the return attenuation factor of an object that reflects the wireless signal on the reflected propagation path, based on the reflected propagation path that satisfies the propagation path conditions stored in the storage unit 302. The return attenuation rate determination unit 312 determines the return attenuation rate of the object that reflected the wireless signal on the reflection propagation path, using, for example, Equation 1 above. The return attenuation rate determination unit 312 may store the determined return attenuation rate of the object and the object position information of the object included in the map information in the storage unit 302 in association with each other.

The return attenuation factor determination unit 312 determines, for example, the return attenuation rate at the reflection point of the object determined by the propagation path determination unit 308. The return attenuation rate determining unit 312 associates and stores the return attenuation rate at the reflection point of the object and reflection point position information indicating the position of the reflection point of the object included in the map information stored in the storage unit 302. It may be stored in the section 302. The return attenuation coefficient at the reflection point of the object and the reflection point position information indicating the position of the reflection point of the object are stored in the storage unit 302 in association with each other. This may be an example of storing them in the storage unit 302 in association with each other.

When an object has multiple different return attenuation coefficients, the return attenuation coefficient of the object varies depending on the reflection point at which the object reflects the wireless signal. For example, when the object is a building, the reflection attenuation rate is different depending on whether the reflection point is concrete or glass. Therefore, the return attenuation rate determination unit 312 determines the return attenuation rate for each reflection point of the object. As a result, the information processing device 300 can determine the return attenuation factor of the object with high accuracy even when the object has a plurality of different return attenuation factors.

For example, the return attenuation factor determining unit 312 further associates the determined return attenuation factor of the object with the transmission frequency information included in the result of transmitting the wireless signal by the communication terminal 200 and stores them in the storage unit 302. For example, the return attenuation factor determining unit 312 further associates the determined return attenuation factor of the object with reception frequency information included in the reception result of the radio signal by the flying object 100 and stores the result in the storage unit 302.

For example, the return attenuation rate determination unit 312 further associates the determined return attenuation rate of the object with transmission time information included in the transmission result of the wireless signal by the communication terminal 200 and stores the result in the storage unit 302. For example, the return attenuation rate determining unit 312 further associates the determined return attenuation rate of the object with the reception time information included in the reception result of the radio signal by the flying object 100 and stores them in the storage unit 302.

The return attenuation rate determining unit 312 determines, for example, the return attenuation rate of the determined object and the information received by the information receiving unit 306 from the weather information management device 400, when the communication terminal 200 transmits a wireless signal or when the aircraft 100 transmits a wireless signal. It is further associated with weather information in a predetermined range including the reflected propagation path when received, and stored in the storage unit 302. The return attenuation rate determining unit 312 determines, for example, the return attenuation rate of the determined object and the information received by the information receiving unit 306 from the people flow information management device 500, when the communication terminal 200 transmits a wireless signal, or when the aircraft 100 transmits a wireless signal. When received, the information on the flow of people in a predetermined range including the reflected propagation path is further associated with the information and stored in the storage unit 302. The return attenuation rate determining unit 312 determines the return attenuation rate of the determined object and the information received by the information receiving unit 306 from the base station management device 600 when the communication terminal 200 transmits a wireless signal or when the aircraft 100 receives a wireless signal. At that time, the information may be stored in the storage unit 302 in association with communication amount information of base stations located in a predetermined range including the reflected propagation path.

When a plurality of return attenuation coefficients of a specific object are stored in the storage unit 302, the return attenuation rate determination unit 312 performs statistical processing on the return attenuation coefficients of the plurality of objects stored in the storage unit 302. Then, the return loss coefficient of the object may be determined. The return attenuation rate determination unit 312 determines, for example, an average return attenuation rate, which is an average return attenuation rate of the return attenuation coefficients of a plurality of objects, as the return attenuation rate of the object. The return attenuation factor determining unit 312 may determine the return attenuation factor corresponding to the median value of the return attenuation factors of the plurality of objects as the return attenuation factor of the object.

The information receiving unit 306 may receive return attenuation rate characteristic data from a return attenuation rate characteristic database that stores return attenuation rate characteristic data indicating return attenuation rate characteristics for each material. The characteristics of the return loss factor include, for example, the frequency characteristics of the return loss factor. The characteristic of the return attenuation factor may include a temperature number characteristic of the return attenuation factor.

For example, the return attenuation rate determination unit 312 calculates the determined return attenuation rate of the object, the transmission frequency information included in the transmission result of the wireless signal by the communication terminal 200, and the wireless signal by the flying object 100, which is stored in the storage unit 302. The material of the object is determined based on at least one of the reception frequency information included in the reception result of , and the return attenuation characteristic data received by the information receiving unit 306 from the return attenuation characteristic database. The return loss rate determining unit 312 determines the reflection propagation determined by the propagation path determining unit 308 when the communication terminal 200 transmits a wireless signal or when the aircraft 100 receives a wireless signal, which is stored in the storage unit 302. The material of the object may be determined further based on temperature information included in weather information for a predetermined range including the route. The return attenuation factor determining section 312 may store the determined material of the object as material information in the storage section 302 in association with the determined return attenuation factor of the object.

Based on the material information stored in the storage unit 302 in association with the return attenuation rate and the return attenuation rate characteristic data received by the information receiving unit 306 from the return attenuation rate characteristic database, the return attenuation rate determination unit 312 The return loss coefficient of the object may also be determined. For example, the return attenuation rate determination unit 312 may determine the return attenuation rate of the object at a frequency different from the frequency indicated by the transmission frequency information stored in the storage unit 302 in association with the return attenuation rate of the object. . The return attenuation rate determining unit 312 may determine the return attenuation rate of an object having a frequency different from the frequency indicated by the reception frequency information stored in the storage unit 302 in association with the return attenuation rate.

The information receiving unit 306 receives the results of the wireless signal transmitted by the communication terminal 200 owned by the worker who is engaged in the work of collecting data necessary for the information processing device 300 to determine the return attenuation coefficient of the object, and the result of the transmission of the wireless signal by the aircraft 100. The reception result of the wireless signal may also be received. The communication terminal 200 may use an input device installed in the communication terminal 200 to receive input by a worker of indoor/outdoor information indicating whether the communication terminal 200 transmitted the wireless signal outdoors or indoors. The communication terminal 200 may transmit a wireless signal by adding indoor/outdoor information. In this case, the information receiving unit 306 receives the communication terminal position information and transmission power information included in the result of transmitting the wireless signal by the communication terminal 200, the received power information included in the result of receiving the wireless signal by the aircraft 100, indoors and outdoors. The information may be stored in the storage unit 302 in association with the information.

The model generation unit 314 generates, by machine learning, an estimation model that estimates whether the communication terminal 200 transmitted the wireless signal outdoors or indoors. The model generation unit 314 uses, for example, the plurality of communication terminal position information, transmission power information, reception power information, and indoor/outdoor information stored in the storage unit 302 as training data, and the information reception unit 306 Based on the received communication terminal position information, transmission power information, and reception power information, an estimation model for estimating whether the communication terminal 200 transmitted the wireless signal outdoors or indoors is generated by machine learning. The model generation unit 314 uses, for example, a plurality of communication terminal position information, transmission power information, reception power information, and indoor/outdoor information indicating that the communication terminal 200 transmitted a wireless signal outdoors as training data. . The model generation unit 314 uses, for example, a plurality of communication terminal position information, transmission power information, reception power information, and indoor/outdoor information indicating that the communication terminal 200 transmitted a wireless signal indoors as training data.

The return loss rate determining unit 312 generates a model from the communication terminal position information and transmission power information included in the result of transmitting the radio signal by the communication terminal 200 and the received power information included in the result of receiving the radio signal by the aircraft 100. Using the estimation model generated by section 314, it may be estimated whether communication terminal 200 transmitted the wireless signal outdoors or indoors. The reflection attenuation rate determination unit 312 determines the reflection loss rate determined by the reception power determination unit 310 based on the transmission power of the wireless signal from the communication terminal 200 estimated to have been transmitted outdoors and the reception power at which the aircraft 100 received the wireless signal. The return attenuation factor of the object may be determined based on the propagation path received power and the reflected propagation path determined by the propagation path determining section 308.

The propagation path determination unit 308 determines the propagation path of the radio signal based on the return attenuation coefficient of the object determined by the return attenuation rate determination unit 312, for example. The propagation path determination unit 308 determines the propagation path of the radio signal propagating from the communication terminal 200 to the aircraft 100 flying in the sky, based on the return attenuation coefficient of the object determined by the return attenuation rate determination unit 312, for example. do. The propagation path determining unit 308 may determine the propagation path of the radio signal propagating from the aircraft 100 to the base station located on the ground based on the return attenuation factor of the object determined by the return attenuation rate determining unit 312. . The information processing device 300 determines the propagation path of the wireless signal based on the return attenuation coefficient of the object determined by the return attenuation rate determination unit 312, so that even if the propagation path of the wireless signal is reflected many times, the transmission path of the wireless signal is high. It can be determined with precision.

The simulation unit 316 simulates the propagation characteristics of a radio signal that the base station receives from the communication terminal 200 when the base station is arranged. The propagation characteristics of the radio signal include, for example, the propagation loss of the radio signal. The propagation characteristics of the radio signal include, for example, the propagation direction of the radio signal.

The base station to be simulated is, for example, a base station scheduled to be placed on the ground. The base station to be simulated is, for example, a base station mounted on an aircraft 100 scheduled to be placed in the sky. The base station to be simulated is, for example, a base station mounted on a HAPS scheduled to be placed in the sky.

The simulation unit 316 simulates the propagation characteristics of the radio signal that the base station receives from the communication terminal 200, for example, based on the return attenuation factor of the object determined by the return attenuation rate determination unit 312. For example, the simulation unit 316 uses the propagation path determining unit 308 to simulate the propagation path of a wireless signal propagating from the communication terminal 200 to the base station. If the result of simulating the propagation path of the wireless signal is that the propagation path of the wireless signal includes a reflected propagation path, the simulation unit 316 simulates that the wireless signal is reflected on the reflected propagation path determined by the return attenuation rate determination unit 312. Using the return loss coefficient of the object, the propagation characteristics of the wireless signal propagating through the reflected propagation path are simulated. Thereafter, the simulation unit 316 simulates the influence of the propagation characteristics of the wireless signal propagating through the reflected propagation path on the propagation characteristics of the wireless signal propagating through the direct propagation path.

The simulation unit 316 calculates, for example, reflection propagation data when the communication terminal 200 transmits a wireless signal or when the flying object 100 receives a wireless signal, which is stored in the storage unit 302 in association with the return loss coefficient of an object. Further based on weather information in a predetermined range including the route, the base station simulates the propagation characteristics of the wireless signal received from the communication terminal 200. The simulation unit 316 simulates, for example, the propagation characteristics of the radio signal that the base station receives from the communication terminal 200 for each weather state indicated by the weather information. The simulation unit 316 calculates, for example, the propagation characteristics of a radio signal that the base station receives from the communication terminal 200 when the weather satisfies the good weather conditions, and when the weather does not satisfy the good weather conditions stored in the storage unit 302. The propagation characteristics of radio signals received by the base station from the communication terminal 200 are simulated.

The simulation unit 316 calculates, for example, reflection propagation data when the communication terminal 200 transmits a wireless signal or when the flying object 100 receives a wireless signal, which is stored in the storage unit 302 in association with the return loss coefficient of an object. The base station simulates the propagation characteristics of the wireless signal received from the communication terminal 200 based on the flow of people information in a predetermined range including the route. For example, the simulation unit 316 simulates the propagation characteristics of the wireless signal that the base station receives from the communication terminal 200 for each number of people indicated by the people flow information. The simulation unit 316 calculates, for example, the propagation characteristics of the wireless signal that the base station receives from the communication terminal 200 when the number of people is less than the people flow threshold stored in the storage unit 302, and the propagation characteristics of the wireless signal that the base station receives from the communication terminal 200 when the number of people is more than the people flow threshold. The propagation characteristics of radio signals received by the base station from the communication terminal 200 in each case are simulated.

The simulation unit 316 calculates, for example, reflection propagation data when the communication terminal 200 transmits a wireless signal or when the flying object 100 receives a wireless signal, which is stored in the storage unit 302 in association with the return loss coefficient of an object. The propagation characteristics of the radio signal received from the communication terminal 200 by the base station are simulated based on the communication amount information of other base stations located in a predetermined range including the route. The simulation unit 316 simulates, for example, the propagation characteristics of a radio signal that the base station receives from the communication terminal 200 for each traffic of another base station indicated by the traffic information. The simulation unit 316 calculates, for example, the propagation characteristics of a wireless signal that the base station receives from the communication terminal 200 when the traffic of the other base station is less than the traffic threshold stored in the storage unit 302, and the other base station. The propagation characteristics of a wireless signal received by the base station from the communication terminal 200 when the communication amount of the station is greater than the communication amount threshold are simulated.

For example, the simulation unit 316 further calculates whether the base station is connected to the communication terminal 200 based on at least one of transmission time information and reception time information stored in the storage unit 302 in association with the return attenuation coefficient of the object. Simulate the propagation characteristics of the received wireless signal. The simulation unit 316 simulates the propagation characteristics of the wireless signal that the base station receives from the communication terminal 200, for example, every predetermined simulation period including at least either transmission time information or reception time information. The simulation period is, for example, March. The simulation period is, for example, January. The simulation period is, for example, one week. The simulation period is, for example, one day. The simulation period may be one hour.

FIG. 4 is an explanatory diagram for explaining an example in which the information processing device 300 determines a reflection propagation path whose return attenuation rate is to be determined. In FIG. 4, an example in which the reflected propagation path propagating from the communication terminal 200 to the aircraft 100 includes the reflected propagation path 220 and the reflected propagation path 225 will be mainly described.

The return attenuation factor determining unit 312 determines, for example, when the communication terminal 200 transmits a wireless signal or when the aircraft 100 receives a wireless signal, which is indicated by the weather information received by the information receiving unit 306 from the weather information management device 400. The return attenuation factor of the object that reflected the radio signal on the reflection propagation path is determined based on the reflection propagation path in which the weather in a predetermined range including the reflection propagation path satisfies a good weather condition. The return attenuation rate determining unit 312 determines, for example, when the communication terminal 200 transmits a wireless signal or when the aircraft 100 receives a wireless signal, which is indicated by the cloud amount information received by the information receiving unit 306 from the weather information management device 400. The return attenuation factor of the object that reflected the radio signal on the reflection propagation path is determined based on the reflection propagation path in which the cloud amount in a predetermined range including the reflection propagation path is lower than the cloud amount threshold. In the example shown in FIG. 4, the information receiving unit 306 includes cloud amount information in a predetermined range including the reflection propagation path 220 and a predetermined cloud amount information including the reflection propagation path 225 when the flying object 100 receives the radio signal. Receive cloud amount information for each area. In FIG. 4, the cloud amount indicated by the cloud amount information in a predetermined range including the reflection propagation path 220 is lower than the cloud amount threshold, and due to the presence of the cloud 60, the cloud amount indicated by the cloud amount information in the predetermined range including the reflection propagation path 225 is lower than the cloud amount threshold. The explanation will continue assuming that the cloud amount is higher than the cloud amount threshold.

Since the amount of clouds in a predetermined range including the reflected propagation path 220 is lower than the cloud amount threshold, the return attenuation factor determination unit 312 determines the return attenuation factor of the building 50 that reflected the wireless signal on the reflected propagation path 220. On the other hand, since the amount of clouds in a predetermined range including the reflection propagation path 225 is higher than the cloud amount threshold, the return attenuation factor determining unit 312 does not determine the return attenuation factor of the building 55 that reflected the wireless signal on the reflection propagation path 225. .

When the weather is bad, such as when there is a lot of cloud cover, the propagation loss that occurs while the wireless signal transmitted by the communication terminal 200 propagates through the atmosphere is greater than when the weather is fine. Therefore, the adverse effect of weather on the accuracy of the return attenuation coefficient of an object determined by the return attenuation coefficient determining unit 312 is greater in bad weather than in good weather.

On the other hand, in the example shown in FIG. 4, the return attenuation factor determination unit 312 determines whether the reflection propagation path is connected to the Determine the return loss coefficient of the object that reflected the signal. Thereby, the information processing device 300 can more reliably determine the return attenuation factor of the object with high precision.

FIG. 5 is an explanatory diagram for explaining another example in which the information processing device 300 determines a reflection propagation path whose return attenuation coefficient is to be determined. In FIG. 5, an example in which the reflected propagation path propagating from the communication terminal 200 to the aircraft 100 includes the reflected propagation path 220 and the reflected propagation path 225 will be mainly described.

The return attenuation factor determining unit 312 determines, for example, when the communication terminal 200 transmits a wireless signal or when the aircraft 100 receives a wireless signal, which is indicated by the people flow information that the information receiving unit 306 receives from the people flow information management device 500. The return attenuation factor of the object that reflected the wireless signal on the reflected propagation path is determined based on the reflected propagation path in which the number of people in a predetermined range including the reflected propagation path is less than the people flow threshold. In the example shown in FIG. 5, the information receiving unit 306 includes information on the flow of people in a predetermined range including the reflected propagation path 220 and a predetermined range including the reflected propagation path 225 when the flying object 100 receives the radio signal. Receive information on the flow of people in each range. In FIG. 5, the explanation will be made assuming that the number of people in a predetermined range including the reflection propagation path 220 is less than the people flow threshold, and the number of people in the predetermined range including the reflection propagation path 225 is greater than the people flow threshold. continue.

The return attenuation factor determination unit 312 determines the return attenuation factor of the building 50 that reflected the wireless signal on the reflection propagation path 220 because the number of people in a predetermined range including the reflection propagation path 220 is less than the people flow threshold. On the other hand, since the number of people in the predetermined range including the reflection propagation path 225 is greater than the human flow threshold, the return loss factor determination unit 312 determines the return loss factor of the building 55 that reflected the wireless signal on the reflection propagation path 225. Not decided.

The wireless signal transmitted by the communication terminal 200 may cause signal interference with a wireless signal for communication by a communication terminal owned by a person located within a predetermined range including the reflected propagation path. Furthermore, the wireless signal transmitted by the communication terminal 200 may be reflected on a reflection propagation path to a person located within the range. Therefore, there is a high possibility that a person residing within the range will have a negative effect on the accuracy of the return attenuation coefficient of the object determined by the return attenuation coefficient determination unit 312.

On the other hand, in the example shown in FIG. 5, the return attenuation factor determining unit 312 determines whether the number of people in a predetermined range including the reflection propagation path is smaller than the people flow threshold. Determine the return loss rate of the object that reflected the radio signal. Thereby, the information processing device 300 can more reliably determine the return attenuation factor of the object with high precision.

FIG. 6 is an explanatory diagram for explaining another example in which the information processing device 300 determines a reflection propagation path whose return attenuation coefficient is to be determined. In FIG. 6, an example in which the reflected propagation path propagating from the communication terminal 200 to the aircraft 100 includes the reflected propagation path 220 and the reflected propagation path 225 will be mainly described.

The return loss rate determining unit 312 determines, for example, when the communication terminal 200 transmits a wireless signal or when the aircraft 100 receives a wireless signal, which is indicated by the communication amount information received by the information receiving unit 306 from the base station management device 600. The return attenuation factor of an object that reflected a wireless signal on the reflected propagation path, based on the reflected propagation path where the communication traffic of base stations located in a predetermined range including the reflected propagation path is lower than the communication volume threshold. Determine. In the example shown in FIG. 6, the information receiving unit 306 includes traffic information and reflection information of the base station 70 located in a predetermined range including the reflection propagation path 220 when the flying object 100 receives a radio signal. The communication amount information of each base station 75 located in a predetermined range including the propagation path 225 is received. In FIG. 6, the description will be continued assuming that the communication amount of the base station 70 is lower than the communication amount threshold, and the communication amount of the base station 75 is higher than the communication amount threshold.

Since the communication amount of the base station 70 is lower than the communication amount threshold, the return attenuation factor determining unit 312 determines the return attenuation factor of the building 50 that reflected the wireless signal on the reflected propagation path 220. On the other hand, the return attenuation rate determination unit 312 does not determine the return attenuation rate of the building 55 that reflected the wireless signal on the reflected propagation path 225 because the communication amount of the base station 75 is higher than the communication amount threshold.

The radio signal transmitted by the communication terminal 200 may cause signal interference with radio signals for communication by base stations located in a predetermined range including the reflected propagation path. Therefore, there is a high possibility that the communication of the base station located in the range will adversely affect the accuracy of the return attenuation coefficient of the object determined by the return attenuation coefficient determination unit 312.

On the other hand, in the example shown in FIG. 6, the return loss factor determination unit 312 is based on the reflected propagation path where the communication amount of the base station located in a predetermined range including the reflected propagation path is lower than the communication amount threshold. Then, the return attenuation factor of the object that reflected the radio signal on the reflected propagation path is determined. Thereby, the information processing device 300 can more reliably determine the return attenuation factor of the object with high precision.

FIG. 7 schematically shows an example in which the aircraft 100 instructs the communication terminal 200. In FIG. 7, an example in which the aircraft 100 forms a wireless communication area 140 including a subcell 142, a subcell 144, a subcell 146, and a subcell 148 will be mainly described.

The aircraft 100 receives target area information from the information processing device 300 via the network 20, for example. In FIG. 7, the description will be continued assuming that the flying object 100 has received target area information indicating a target area 80 including a building 50, which is a target object for which the return attenuation rate is to be determined.

For example, the aircraft 100 sends a communication terminal location information to a communication terminal 200 located in a subcell that includes the target area indicated by the target area information received from the information processing device 300, among a plurality of subcells that constitute a wireless communication area. Instruct to send information. The aircraft 100 instructs the communication terminal 200 to transmit the communication terminal position information by, for example, transmitting a transmission instruction to the communication terminal 200 residing in a subcell including the target area. In FIG. 7, the aircraft 100 sends a communication terminal to a communication terminal 200 located in a subcell 142 that includes the target area 80 out of subcells 142, 144, 146, and 148 that make up the wireless communication area 140. The explanation will continue assuming that a transmission instruction instructing to transmit location information has been transmitted.

When the communication terminal 200 located in the subcell 142 is able to acquire communication terminal position information indicating the position when the communication terminal 200 transmitted the wireless signal in response to receiving the transmission instruction from the aircraft 100, A radio signal is transmitted with the communication terminal location information attached thereto. The flying object 100 transmits the results of the wireless signal transmission by the communication terminal 200 located in the subcell 142 and the receiving result of the wireless signal by the flying object 100 to the information processing device 300.

According to the example shown in FIG. 7, the flying object 100 transmits communication terminal position information only to the communication terminal 200 located in a subcell that includes the target area indicated by the target area information received from the information processing device 300. instruct what to do. Thereby, the information processing device 300 can efficiently collect data necessary for determining the return attenuation coefficient of the target object, so that the system 10 as a whole can efficiently determine the return attenuation coefficient of the object.

In an example shown in FIG. 7, the flying object 100 may transmit a transmission instruction including target area information to a communication terminal 200 located in a wireless communication area. In this case, the communication terminal 200 determines whether the position of the communication terminal 200 is included in the target area indicated by the target area information, and if the position of the communication terminal 200 is included in the target area, transmits a wireless signal. .

FIG. 8 is an explanatory diagram for explaining an example of the processing flow of the information processing device 300. In FIG. 8, an example of a process flow in which the information processing device 300 determines the return attenuation coefficient of an object will be mainly described.

In step (step may be abbreviated as S) 102 , the information receiving unit 306 transmits the results of the wireless signal transmission by the communication terminal 200 from the aircraft 100 via the network 20 and the information received by the aircraft 100 . Receive the wireless signal reception results. In S104, the received power determining unit 310 determines the radio power received by the aircraft 100, which is indicated by the received power information included in the reception result of the radio signal by the aircraft 100, which the information receiving unit 306 received from the aircraft 100 in S102. It is determined whether the received power of the signal is greater than the received power threshold stored in the storage unit 302. If the received power determination unit 310 determines that the received power of the radio signal received by the aircraft 100 is greater than the received power threshold, the process advances to S106. If the received power determination unit 310 determines that the received power of the radio signal received by the aircraft 100 is smaller than the received power threshold, the processing of the information processing device 300 ends.

In S106, the propagation path determining unit 308 determines the communication terminal position of the communication terminal 200 when the communication terminal 200 transmitted the wireless signal, which is included in the transmission result of the wireless signal by the communication terminal 200, which is received by the information receiving unit 306 in S102. Based on the information and the aircraft position information of the aircraft 100 when the aircraft 100 received the radio signal, which is included in the reception result of the radio signal by the aircraft 100, and the map information stored in the storage unit 302, Determine the reflection propagation path. In FIG. 8, the description will be continued assuming that the propagation path through which the wireless signal propagated from the communication terminal 200 to the aircraft 100 includes a reflected propagation path.

In S<b>108 , the return loss factor determination unit 312 determines whether the reflection propagation path determined by the propagation path determination unit 308 in S<b>106 satisfies the propagation path conditions stored in the storage unit 302 . When the return attenuation rate determination unit 312 determines that the reflection propagation path satisfies the propagation path conditions, the process advances to S110. If the reflection attenuation rate determination unit 312 determines that the reflection propagation path does not satisfy the propagation path conditions, the processing of the information processing device 300 ends.

In S110, the received power determining unit 310 determines the received power of the radio signal received by the aircraft 100, which is indicated by the received power information included in the reception result of the radio signal by the aircraft 100, which the information receiving unit 306 received in S102. Based on this, the reflected propagation path reception power when the aircraft 100 receives the radio signal propagated on the reflected propagation path determined by the propagation path determination unit 308 in S108 is determined. In S112, the return loss rate determining unit 312 determines the transmission power of the wireless signal transmitted by the communication terminal 200, which is indicated by the transmission power information included in the transmission result of the wireless signal by the communication terminal 200, which is received by the information receiving unit 306 in S102. Based on the reflected propagation path received power determined by the received power determination unit 310 in S110 and the reflected propagation path in S306, the return attenuation factor of the object that reflected the wireless signal on the reflected propagation path is determined. The return attenuation rate determining unit 312 associates the determined return attenuation coefficient of the object with the object position information of the object included in the map information stored in the storage unit 302 and stores it in the storage unit 302 . After that, the processing of the information processing device 300 ends.

FIG. 9 schematically shows an example of the hardware configuration of the computer 1200 functioning as the information processing device 300. The program installed on the computer 1200 causes the computer 1200 to function as one or more "parts" of the apparatus according to the above embodiment, or causes the computer 1200 to perform operations associated with the apparatus according to the above embodiment or the one or more "parts" of the apparatus according to the above embodiment. Multiple units may be executed and/or the computer 1200 may execute a process or a step of a process according to the embodiments described above. Such programs may be executed by CPU 1212 to cause computer 1200 to perform certain operations associated with some or all of the blocks in the flowcharts and block diagrams described herein.

The computer 1200 according to this embodiment includes a CPU 1212, a RAM 1214, and a graphics controller 1216, which are interconnected by a host controller 1210. The computer 1200 also includes input/output units such as a communication interface 1222, a storage device 1224, a DVD drive 1226, and an IC card drive, which are connected to the host controller 1210 via an input/output controller 1220. DVD drive 1226 may be a DVD-ROM drive, a DVD-RAM drive, or the like. Storage device 1224 may be a hard disk drive, solid state drive, or the like. Computer 1200 also includes legacy input/output units, such as ROM 1230 and keyboard 1242, which are connected to input/output controller 1220 via input/output chip 1240.

The CPU 1212 operates according to programs stored in the ROM 1230 and RAM 1214, thereby controlling each unit. Graphics controller 1216 obtains image data generated by CPU 1212, such as in a frame buffer provided in RAM 1214 or itself, and causes the image data to be displayed on display device 1218.

Communication interface 1222 communicates with other electronic devices via a network. Storage device 1224 stores programs and data used by CPU 1212 within computer 1200. The DVD drive 1226 reads a program or data from a DVD-ROM 1227 or the like and provides it to the storage device 1224. The IC card drive reads programs and data from and/or writes programs and data to the IC card.

ROM 1230 stores therein programs that are dependent on the computer 1200 hardware, such as a boot program that is executed by the computer 1200 upon activation. I/O chip 1240 may also connect various I/O units to I/O controller 1220 via USB ports, parallel ports, serial ports, keyboard ports, mouse ports, etc.

The program is provided by a computer readable storage medium such as a DVD-ROM 1227 or an IC card. The program is read from a computer-readable storage medium, installed in storage device 1224, RAM 1214, or ROM 1230, which are also examples of computer-readable storage media, and executed by CPU 1212. The information processing described in these programs is read by the computer 1200 and provides coordination between the programs and the various types of hardware resources described above. An apparatus or method may be configured to implement the operation or processing of information according to the use of computer 1200.

For example, when communication is performed between the computer 1200 and an external device, the CPU 1212 executes a communication program loaded into the RAM 1214 and sends communication processing to the communication interface 1222 based on the processing written in the communication program. You may give orders. The communication interface 1222 reads transmission data stored in a transmission buffer area provided in a recording medium such as a RAM 1214, a storage device 1224, a DVD-ROM 1227, or an IC card under the control of the CPU 1212, and transmits the read transmission data. Data is transmitted to the network, or received data received from the network is written to a reception buffer area provided on the recording medium.

Further, the CPU 1212 causes the RAM 1214 to read all or a necessary part of a file or database stored in an external recording medium such as a storage device 1224, a DVD drive 1226 (DVD-ROM 1227), or an IC card. Various types of processing may be performed on the data. CPU 1212 may then write the processed data back to an external storage medium.

Various types of information, such as various types of programs, data, tables, and databases, may be stored on a recording medium and subjected to information processing. CPU 1212 performs various types of operations, information processing, conditional determination, conditional branching, unconditional branching, and information retrieval on data read from RAM 1214 as described elsewhere in this disclosure and specified by the program's instruction sequence. Various types of processing may be performed, including /substitutions, etc., and the results are written back to RAM 1214. Further, the CPU 1212 may search for information in a file in a recording medium, a database, or the like. For example, when a plurality of entries are stored in a recording medium, each having an attribute value of a first attribute associated with an attribute value of a second attribute, the CPU 1212 selects the first entry from among the plurality of entries. Search for an entry whose attribute value matches the specified condition, read the attribute value of the second attribute stored in the entry, and then set the attribute value to the first attribute that satisfies the predetermined condition. An attribute value of the associated second attribute may be obtained.

The programs or software modules described above may be stored in a computer-readable storage medium on or near computer 1200. Also, a storage medium such as a hard disk or RAM provided in a server system connected to a dedicated communication network or the Internet can be used as a computer-readable storage medium, thereby allowing the program to be transferred to the computer 1200 via the network. provide.

Blocks in the flowcharts and block diagrams of the present embodiments may represent stages in a process in which an operation is performed or a "part" of a device responsible for performing the operation. Certain steps and units may be provided with dedicated circuitry, programmable circuitry provided with computer readable instructions stored on a computer readable storage medium, and/or provided with computer readable instructions stored on a computer readable storage medium. May be implemented by a processor. Dedicated circuitry may include digital and/or analog hardware circuits, and may include integrated circuits (ICs) and/or discrete circuits. Programmable circuits can perform AND, OR, EXCLUSIVE OR, NAND, NOR, and other logical operations, such as field programmable gate arrays (FPGAs), programmable logic arrays (PLAs), etc. , flip-flops, registers, and memory elements.

A computer-readable storage medium may include any tangible device capable of storing instructions for execution by a suitable device such that a computer-readable storage medium with instructions stored therein may be illustrated in a flowchart or block diagram. A product will be provided that includes instructions that can be executed to create a means for performing specified operations. Examples of computer-readable storage media may include electronic storage media, magnetic storage media, optical storage media, electromagnetic storage media, semiconductor storage media, and the like. More specific examples of computer readable storage media include floppy disks, diskettes, hard disks, random access memory (RAM), read only memory (ROM), erasable programmable read only memory (EPROM or flash memory). , Electrically Erasable Programmable Read Only Memory (EEPROM), Static Random Access Memory (SRAM), Compact Disc Read Only Memory (CD-ROM), Digital Versatile Disk (DVD), Blu-ray Disc, Memory Stick , integrated circuit cards, and the like.

Computer-readable instructions may include assembler instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, state configuration data, or instructions such as Smalltalk®, JAVA®, C++, etc. any source code or object code written in any combination of one or more programming languages, including object-oriented programming languages such as may include.

The computer-readable instructions are for producing means for a processor of a general purpose computer, special purpose computer, or other programmable data processing device, or programmable circuit to perform the operations specified in the flowchart or block diagrams. A general purpose computer, special purpose computer, or other programmable data processor, locally or over a local area network (LAN), wide area network (WAN), such as the Internet, to execute the computer readable instructions. It may be provided in a processor or programmable circuit of the device. Examples of processors include computer processors, processing units, microprocessors, digital signal processors, controllers, microcontrollers, and the like.

Although the present invention has been described above using the embodiments, the technical scope of the present invention is not limited to the range described in the above embodiments. It will be apparent to those skilled in the art that various changes or improvements can be made to the embodiments described above. It is clear from the claims that forms with such changes or improvements may also be included within the technical scope of the present invention.

The execution order of each process, such as an operation, a procedure, a step, and a stage in the apparatus, system, program, and method shown in the claims, specification, and drawings, specifically refers to "before" or "before". It should be noted that they can be implemented in any order unless the output of the previous process is used in the subsequent process. Even if the claims, specifications, and operational flows in the drawings are explained using "first," "next," etc. for convenience, this does not mean that it is essential to carry out the operations in this order. It's not a thing.

10 system, 20 network, 40 gateway, 50 building, 55 building, 60 cloud, 70 base station, 75 base station, 80 target area, 100 aircraft, 121 main wing, 122 main body, 124 propeller, 130 solar panel, 132 SL antenna, 134 FL antenna, 140 wireless communication area, 142 subcell, 144 subcell, 146 subcell, 148 subcell, 150 control device, 200 communication terminal, 210 direct propagation path, 220 reflected propagation path, 225 reflected propagation path, 300 information processing device, 302 storage unit, 304 information transmission unit, 306 information reception unit, 308 propagation path determination unit, 310 received power determination unit, 312 return attenuation rate determination unit, 314 model generation unit, 316 simulation unit, 400 weather information management device , 500 people flow information management device, 600 base station management device, 1200 computer, 1210 host controller, 1212 CPU, 1214 RAM, 1216 graphic controller, 1218 display device, 1220 input/output controller, 1222 communication interface, 1224 storage device, 1226 DVD drive , 1227 DVD-ROM, 1230 ROM, 1240 input/output chip, 1242 keyboard

Claims (16)

a storage unit that stores map information including object position information indicating the position of the object and object shape information indicating the shape of the object;
Transmission power information indicating the transmission power of a radio signal transmitted by a communication terminal to an aircraft flying above; reception power information indicating reception power of the radio signal received by the aircraft; an information receiving unit that receives communication terminal position information indicating the position when the radio signal was transmitted, and aircraft position information indicating the position when the aircraft received the radio signal;
Based on the communication terminal position information, the aircraft position information, and the map information, reflection of the radio signal by the object is included until the radio signal propagates from the communication terminal to the aircraft. a propagation path determination unit that determines a reflected propagation path that is a propagation path;
a received power determination unit that determines a reflected propagation path received power that is a received power at which the flying object received the wireless signal propagated on the reflected propagation path, based on the received power indicated by the received power information;
an information processing device comprising: a return attenuation rate determination unit that determines a return attenuation rate of the object based on the transmission power indicated by the transmission power information, the reflected propagation path received power, and the reflected propagation path. . The information processing apparatus according to claim 1, wherein the received power determination unit determines the reflected propagation path received power based on the received power that is larger than a predetermined received power threshold. The storage unit corresponds to the communication terminal position information, the transmission power information, the reception power information, and indoor/outdoor information indicating whether the communication terminal transmitted the wireless signal outdoors or indoors. Attach and store it.
The information processing device uses the plurality of communication terminal position information, the transmission power information, the reception power information, and the indoor/outdoor information stored in the storage unit as training data to control the communication terminal. a model generation unit that uses machine learning to generate an estimation model for estimating whether the communication terminal transmitted the wireless signal outdoors or indoors from the position information, the transmission power information, and the reception power information; More prepared,
The return loss factor determination unit uses the estimation model to determine the radio signal of the communication terminal that is estimated to have been transmitted outdoors, based on the communication terminal location information, the transmission power information, and the reception power information. The transmission power, the reflected propagation path received power determined by the received power determination unit based on the received power at which the flying object received the wireless signal, and the reflected propagation path are determined based on the reflected propagation path. determine the return loss coefficient,
The information processing device according to claim 1 or 2. The propagation path determination unit determines a reflection point that is a point at which the wireless signal is reflected by the object on the reflection propagation path,
The return attenuation rate determination unit determines the return attenuation rate at the reflection point of the object.
The information processing device according to any one of claims 1 to 3. The information receiving unit further transmits weather information indicating the weather in a predetermined range including the reflected propagation path when the communication terminal transmits the wireless signal or when the flying object receives the wireless signal. receive,
The return attenuation rate determination unit stores the return attenuation rate of the object and the weather information in association with each other in the storage unit.
The information processing device according to any one of claims 1 to 4. The information receiving unit further transmits weather information indicating the weather in a predetermined range including the reflected propagation path when the communication terminal transmits the wireless signal or when the flying object receives the wireless signal. receive,
The return attenuation rate determination unit determines the return attenuation rate of the object based on the reflection propagation path where the weather indicated by the weather information satisfies a predetermined good weather condition.
The information processing device according to any one of claims 1 to 4. The information receiving unit is configured to receive the weather information including cloud amount information indicating the cloud amount in the range including the reflection propagation path when the communication terminal transmits the wireless signal or when the flying object receives the wireless signal. receive and
The return attenuation rate determination unit determines the return attenuation rate of the object based on the reflection propagation path in which the cloud amount indicated by the cloud amount information included in the weather information is lower than a predetermined cloud amount threshold.
The information processing device according to claim 6. The information receiving unit is configured to provide people flow information indicating the number of people in a predetermined range including the reflected propagation path when the communication terminal transmits the wireless signal or when the flying object receives the wireless signal. further receive and
The return attenuation rate determination unit determines the return attenuation rate of the object based on the reflection propagation path in which the number of people indicated by the people flow information is less than a predetermined people flow threshold.
The information processing device according to any one of claims 1 to 7. The information receiving unit is configured to detect a base station located in a predetermined range including the reflected propagation path when the communication terminal transmits the radio signal or when the flying object receives the radio signal. further receive traffic information indicating the traffic;
The return attenuation factor determination unit determines the return attenuation factor of the object based on the reflection propagation path where the communication amount of the base station indicated by the communication amount information is lower than a predetermined communication amount threshold.
The information processing device according to any one of claims 1 to 8. The base station is located in a predetermined range including the position of the object indicated by the object position information based on the return attenuation coefficient of the object determined by the return attenuation rate determination unit. The information processing device according to any one of claims 1 to 9, further comprising a simulation unit that simulates propagation characteristics of a radio signal that the station receives from a communication terminal. The information processing device according to any one of claims 1 to 10, wherein the information processing device is mounted on the flying object. A program for causing a computer to function as the information processing device according to any one of claims 1 to 11. The information processing device according to any one of claims 1 to 11;
A system comprising the above-mentioned flying object. 14. The system of claim 13, wherein the flying vehicle functions as a stratospheric platform and forms a wireless communication area by irradiating a beam to provide wireless communication services to the communication terminals within the wireless communication area. The information processing device further includes an information transmitting unit that transmits target area information indicating a target area including a target object whose return attenuation rate is to be determined to the flying object,
The flying object transmits the communication information to the communication terminal located in a subcell including the target area indicated by the target area information received from the information processing device, out of a plurality of subcells forming the wireless communication area. Instructs to send device location information,
15. The system of claim 14. An information processing method performed by a computer, the method comprising:
Transmission power information indicating the transmission power of a radio signal transmitted by the communication terminal to an aircraft flying above; reception power information indicating the reception power at which the radio signal was received by the aircraft; an information receiving step of receiving communication terminal position information indicating the position when the radio signal was transmitted, and aircraft position information indicating the position when the aircraft received the radio signal;
Based on the communication terminal position information, the flying object position information, and map information stored in the computer that includes object position information indicating the position of the object and object shape information indicating the shape of the object, a propagation path determining step of determining a reflected propagation path that is a propagation path that includes reflection of the wireless signal by the object before the wireless signal propagates from the communication terminal to the flying object;
a received power determining step of determining a reflected propagation path received power, which is a received power at which the flying object received the wireless signal propagated on the reflected propagation path, based on the received power indicated by the received power information;
an information processing method comprising: determining a return attenuation rate of the object based on the transmission power indicated by the transmission power information, the reflected propagation path received power, and the reflected propagation path; .

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