JP6689802B2 - Communication relay device, system and management device - Google Patents

Description

  The present invention relates to handling a HAPS (high altitude platform station) failure drop suitable for constructing a three-dimensional network for fifth generation communication.

  Conventionally, there is known a communication standard called LTE-Advanced Pro, which is an extension of LTE (Long Term Evolution) -Advanced (see Non-Patent Document 1) of 3GPP, which is a communication standard of a mobile communication system (see Non-Patent Document 2). . In this LTE-Advanced Pro, specifications have been established for providing communication to recent IoT (Internet of Things) devices. Furthermore, a fifth generation mobile device that supports simultaneous connection to a large number of terminal devices such as IoT devices (also referred to as “UE (user device)”, “mobile station”, and “communication terminal”) and low delay. Communication is under consideration (see Non-Patent Document 3, for example).

3GPP TS 36.300 V10.12.0 (2014-12). 3GPP TS 36.300 V13.5.0 (2016-09). G. Romano, "3GPP RAN progress on" 5G "", 3GPP, 2016.

  In the wireless communication with the terminal device including the IoT device in the fifth generation mobile communication, etc., the propagation delay is low, a large number of terminals in a wide range can be simultaneously connected, high speed communication is possible, and the system capacity per unit area is high. There is a problem to realize a large three-dimensional network stably over a wide area. In addition, there is a problem of improving safety when a device realized by such a three-dimensional network fails.

A communication relay device according to an aspect of the present invention includes a wireless relay station that performs wireless communication with a terminal device, and a levitation body that is controlled to be located in an airspace of a predetermined altitude by autonomous control or control from the outside. In the air-levitation type communication relay device, the communication relay device itself is located at a predetermined fall target location predicted based on information of surrounding airflow when a failure occurs due to the descending of the communication relay device itself. Is provided with a means for dropping.

In the communication relay device, a connection releasing mechanism configured by a plurality of partial structures connected by connection-releasable connecting portions, and selectively releasing the connection of the plurality of partial structures, and the plurality of partial structures. And a control unit that controls the connection release by the connection release mechanism so that the device is dropped to the drop target location.
The control unit may control at least one of the position and the number of connecting units for releasing the connection and the timing for releasing the connection.
Further, the control unit selects a combination of decoupling that has the highest probability of falling to the target drop location from a plurality of combinations of decoupling of the plurality of partial structures, and decomposes it into the partial structures. May be controlled as follows.
Further, in the communication relay device, each of the plurality of partial structures may be dropped while transmitting a drop warning signal to a terminal device located at a place where the partial structures are dropped.

Further, the communication relay device may be provided with means for detecting a change in altitude of the communication relay device itself and detecting occurrence of the failure based on the change in altitude. Means may be provided for receiving from the external device information regarding the occurrence of a failure associated with.
Further, the communication relay device may include a unit that predicts the target drop location, and a unit that receives information about the target drop location from an external device.

Further, in the communication relay device, the external device may be a ground or sky management device that manages the communication relay device. The external device is located in the periphery and includes a wireless relay station that performs wireless communication with the terminal device and a levitation body that is controlled to be located in an air space of a predetermined altitude by autonomous control or control from the outside. Alternatively, a plurality of other communication relay devices may be used.

Further, in the communication relay device, the drop target location is a wind speed and a wind direction of a peripheral airflow at the time of occurrence of the failure, a moving speed and a moving direction of the communication relay apparatus in which the failure has occurred, and communication in which the failure has occurred. It may be predicted based on the mass or the mass and the outer size of the plurality of partial structures that configure the relay device or the communication relay device.
Further, in the communication relay device, the drop target location is a result of machine learning obtained by a plurality of drop tests performed under a plurality of different conditions for the communication relay device or the plurality of partial structures. It may be predicted based on.

Further, in the communication relay device, dropping of the communication relay device itself may be dropped while transmitting the fall alarm signal to the terminal device located in a location that can be predicted.
Further, in the communication relay device, when a failure accompanied by a descent occurs in another communication relay device located in the vicinity, a terminal device located in a place where the other communication relay device or a partial structure thereof is predicted to fall. it may transmit a fall alarm signal.
Further, in the communication relay device, even if a change in altitude of another communication relay device located in the vicinity is detected, and occurrence of a failure accompanied by a descent of the other communication relay device is detected based on the change in altitude. Good.

Further, in the communication relay device, a three-dimensional cell may be formed in a predetermined cell formation target airspace between the ground and the sea surface, and the altitude of the cell formation target airspace may be 10 [km] or less. The altitude of the cell formation target airspace may be 50 [m] or more and 1 [km] or less.
Further, in the communication relay device, the altitude of the air space where the floating body is located may be 100 [km] or less. The levitation body may be located in a stratosphere having an altitude of 11 [km] or more and 50 [km] or less.

  A system according to another aspect of the present invention is a system including a plurality of any one of the communication relay devices, wherein each of the plurality of communication relay devices exchanges position information and scheduled route information of the communication relay device with each other. , The movement paths are controlled so that they do not approach each other within a predetermined distance or less than a predetermined distance.

A management device according to still another aspect of the present invention is a management device that manages any one of the communication relay devices, which is located on the ground or in the sky.
The management device may predict a fall target location of the communication relay device in which the failure has occurred, and transmit information regarding the predicted fall target location to the communication relay device in which the failure has occurred.
Further, in the management apparatus, dropping of the communication relay device or a partial structure may transmit the drop alarm signal to the terminal device located in a location that can be predicted.

  ADVANTAGE OF THE INVENTION According to this invention, the propagation delay of the wireless communication with the terminal device containing the device for IoT in 5th generation mobile communication etc. is low, it can be simultaneously connected with many terminal devices of a wide range, high-speed communication is possible, and unit area is large. A three-dimensional network with a large system capacity per unit can be stably realized over a wide area, and the safety in case of failure can be enhanced.

1 is a schematic configuration diagram showing an example of the overall configuration of a communication system that realizes a three-dimensional network according to an embodiment of the present invention. The perspective view which shows an example of HAPS used for the communication system of embodiment. The side view which shows the other example of HAPS used for the communication system of embodiment. FIG. 3 is an explanatory diagram showing an example of a wireless network formed in the sky by a plurality of HAPSs according to the embodiment. The schematic block diagram which shows an example of the whole structure of the communication system which implement | achieves the three-dimensional network which concerns on other embodiment. The block diagram which shows one structural example of the wireless relay station of HAPS of embodiment. The block diagram which shows the other structural example of the wireless relay station of HAPS of embodiment. The block diagram which shows the further another structural example of the wireless relay station of HAPS of embodiment. Explanatory drawing which shows an example of the failure generation by the collision at the time of formation flight of HAPS. The flowchart which shows an example of the collision avoidance flight control of HAPS during formation flight. Explanatory drawing which shows an example of the collision avoidance flight of HAPS during formation flight. (A) A top view showing an example of HAPS consisting of a plurality of partial structures. (B) The top view which shows the partial structure after disassembly which the HAPS was decoupled. The block diagram which shows an example of the control system of the decoupling of the partial structure in HAPS of embodiment. FIG. 5 is a sequence diagram showing an example of control when a HAPS failure occurs in the communication system of the embodiment. Explanatory drawing which shows an example of the mode of decomposition fall of HAPS. 6 is a flowchart showing an example of centralized management processing using a HAPS fall management database of a remote control device (control center) in the communication system of the embodiment.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic configuration diagram showing an example of the overall configuration of a communication system according to an embodiment of the present invention.
The communication system according to the present embodiment is suitable for realizing a three-dimensional network for fifth generation mobile communication, which supports simultaneous connection to a large number of terminal devices and low delay.

As illustrated in FIG. 1, the communication system includes a plurality of high altitude platform stations (HAPS) 10 and 20 as a plurality of aerial levitation type communication relay devices. The HAPS 10 and 20 are located in an air space of a predetermined altitude and form three-dimensional cells (three-dimensional areas) 41 and 42 in the cell formation target air space 40 of the predetermined altitude as shown by hatched areas in the figure. HAPS10,20 autonomously controlled or 100 from the ground or sea surface by external control [km] The following high-altitude airspace (flotation airspace) 50 to the floating or buoyant body is controlled so as to lie flight (e.g., (Solar plane, airship) is equipped with a wireless relay station.

  The airspace 50 in which the HAPS 10 and 20 are located is, for example, a stratospheric airspace with an altitude of 11 [km] or more and 50 [km] or less. The airspace 50 may be an airspace having an altitude of 15 [km] or more and 25 [km] or less, in which the weather conditions are relatively stable, and may be an airspace having an altitude of approximately 20 [km]. Hrsl and Hrsu in the figure respectively indicate the relative heights of the lower end and the upper end of the air space 50 where the HAPS 10, 20 are located with respect to the ground (GL).

  The cell formation target airspace 40 is a target airspace for forming a three-dimensional cell by one or more HAPS in the communication system of the present embodiment. The cell formation target airspace 40 is located between the airspace 50 in which the HAPS 10 and 20 are located and the cell formation region near the ground covered by the base station 90 such as the conventional macrocell base station, and the predetermined altitude range (for example, 50 [ It is an airspace of an altitude range from m] to 1000 [m]. Hcl and Hcu in the figure respectively indicate the relative altitudes of the lower end and the upper end of the cell formation target airspace 40 with respect to the ground (GL).

  The cell formation target air space 40 in which the three-dimensional cell of this embodiment is formed may be above the sea, river, or lake.

  The wireless relay stations of the HAPS 10 and 20 form beams 100 and 200 for wireless communication with a terminal device, which is a mobile station, toward the ground. The terminal device may be a communication terminal module incorporated in a drone 60 which is an aircraft such as a small helicopter capable of remote control, or a user device used by a user in an airplane 65. In the cell formation target air space 40, the regions through which the beams 100 and 200 pass are the three-dimensional cells 41 and 42. The plurality of beams 100 and 200 adjacent to each other in the cell formation target airspace 40 may partially overlap.

  The wireless relay stations of the HAPS 10 and 20 are each connected to the core network of the mobile communication network 80 via a feeder station (gateway) 70 which is a relay station installed on the ground or at the sea. Communication between the HAPS 10 and 20 and the feeder station 70 may be performed by wireless communication using radio waves such as microwaves, or may be performed by optical communication using laser light or the like.

  Each of the HAPSs 10 and 20 may autonomously control its own levitating movement (flying) and processing at the wireless relay station by a control unit configured by a computer or the like incorporated therein to execute a control program. For example, the HAPS 10 and 20 each acquire their own current position information (for example, GPS position information), position control information (for example, flight schedule information) stored in advance, position information of other HAPS located in the vicinity, and the like. The levitation movement (flight) and the process in the wireless relay station may be autonomously controlled based on the information of (1).

  Further, the floating movement (flight) of each of the HAPS 10 and 20 and the processing in the wireless relay station may be controlled by a remote control device 85 as a management device provided in a communication center of the mobile communication network 80 or the like. In this case, the HAPS 10, 20 has a control communication terminal device (for example, a mobile communication module) incorporated therein so as to receive control information from the remote control device 85 and send various information to the remote control device 85, Terminal identification information (eg, IP address, telephone number, etc.) may be assigned so that the remote control device 85 can identify it. The MAC address of the communication interface may be used to identify the control communication terminal device. In addition, the HAPS 10 and 20 respectively provide information regarding the levitation movement (flight) of HAPS or its surrounding HAPS and processing at the wireless relay station, and information such as observation data acquired by various sensors to a predetermined value of the remote control device 85 or the like. You may make it transmit to a transmission destination.

  In the cell formation target airspace 40, there may be a region where the beams 100 and 200 of the HAPS 10 and 20 do not pass (regions where the three-dimensional cells 41 and 42 are not formed). In order to complement this area, as in the configuration example of FIG. 1, a radial beam 300 is formed upward from the ground side or the sea side to form a three-dimensional cell 43 to form an ATG (Air To Ground) connection. A base station (hereinafter, referred to as “ATG station”) 30 for performing may be provided.

  In addition, by adjusting the positions of the HAPSs 10 and 20, the divergence angles (beam widths) of the beams 100 and 200, etc. without using the ATG station 30, the wireless relay stations of the HAPSs 10 and 20 are set up in the cell formation target airspace 40. The beams 100 and 200 may be formed so as to cover the entire upper end surface of the cell formation target airspace 40 so that the dimensional cells are formed all over.

  The three-dimensional cells formed by the HAPS 10 and 20 may be formed so as to reach the ground surface or the sea surface so that they can communicate with a terminal device located on the ground or at the sea.

FIG. 2 is a perspective view showing an example of the HAPS 10 used in the communication system of the embodiment.
The HAPS 10 of FIG. 2 is a solar plane type HAPS, and has a plurality of main blades 101 with both ends in the longitudinal direction extending upward and a plurality of bus power system propulsion devices at one edge of the main blade 101 in the lateral direction. Motor driven propeller 103. A solar power generation panel (hereinafter referred to as “solar panel”) 102 as a solar power generation unit having a solar power generation function is provided on the upper surface of the main wing portion 101. In addition, pods 105 serving as a plurality of device accommodating parts for accommodating mission devices are connected to two positions on the lower surface of the main wing part 101 in the longitudinal direction via plate-like connecting parts 104. Inside each pod 105, a wireless relay station 110 as a mission device and a battery 106 are housed. Further, wheels 107 used at the time of taking off and landing are provided on the lower surface side of each pod 105. The electric power generated by the solar panel 102 is stored in the battery 106, the motor of the propeller 103 is rotationally driven by the electric power supplied from the battery 106, and the wireless relay processing by the wireless relay station 110 is executed.

  The solar plane type HAPS 10 can be levitated by a lift force by performing a turning flight or a figure-8 flight, and can be levitated so as to stay in a predetermined horizontal range at a predetermined altitude. The solar plane type HAPS 10 can fly like a glider when the propeller 103 is not rotationally driven. For example, the power of the battery 106 rises to a high position when the solar panel 102 generates power during the daytime, and when the solar panel 102 cannot generate power during the night, the power supply from the battery 106 to the motor is stopped and the glider. You can fly like.

  The HAPS 10 also includes a three-dimensional directional optical antenna device 130 as a communication unit used for optical communication with other HAPS and artificial satellites. In the example of FIG. 2, the optical antenna device 130 is arranged at both ends of the main wing portion 101 in the longitudinal direction, but the optical antenna device 130 may be arranged at another portion of the HAPS 10. The communication unit used for optical communication with other HAPS and artificial satellites is not limited to such optical communication, and may be wireless communication by other methods such as wireless communication by radio waves such as microwaves. Good.

FIG. 3 is a perspective view showing another example of the HAPS 20 used in the communication system of the embodiment.
The HAPS 20 of FIG. 3 is an unmanned airship type HAPS and has a large payload, so a large capacity battery can be mounted. The HAPS 20 includes an airship body 201 filled with a gas such as helium gas for levitating with buoyancy, a motor-driven propeller 202 as a bus power system propulsion device, and a device housing portion 203 that houses mission devices. Prepare A wireless relay station 210 and a battery 204 are housed inside the device housing unit 203. The electric power supplied from the battery 204 rotationally drives the motor of the propeller 202, and the wireless relay station 210 executes wireless relay processing.

  A solar panel having a solar power generation function may be provided on the upper surface of the airship body 201 so that the battery 204 stores the electric power generated by the solar panel.

  The unmanned airship type HAPS 20 also includes a three-dimensional directional optical antenna device 230 as a communication unit used for optical communication with other HAPS and artificial satellites. In the example of FIG. 3, the optical antenna device 230 is arranged on the upper surface of the airship body 201 and the lower surface of the device housing 203, but the optical antenna device 230 may be arranged on other parts of the HAPS 20. The communication unit used for optical communication with other HAPS or artificial satellites is not limited to such optical communication, but may be wireless communication by other methods such as wireless communication by radio waves such as microwaves. It may be.

FIG. 4 is an explanatory diagram showing an example of a wireless network formed in the sky by the plurality of HAPS 10 and 20 of the embodiment.
The plurality of HAPS 10 and 20 are configured to be capable of performing inter-HAPS communication by optical communication in the sky, and form a wireless communication network with excellent robustness that can stably realize a three-dimensional network over a wide area. This wireless communication network can also function as an ad hoc network by dynamic routing according to various environments and various information. The wireless communication network can be formed to have various two-dimensional or three-dimensional topologies, and may be, for example, a mesh type wireless communication network as shown in FIG.

FIG. 5 is a schematic configuration diagram showing an example of the overall configuration of a communication system according to another embodiment.
In FIG. 5, the same parts as those in FIG. 1 described above are designated by the same reference numerals, and the description thereof will be omitted.

  In the embodiment of FIG. 5, communication between the HAPS 10 and the core network of the mobile communication network 80 is performed via the feeder station 70 and the low-orbit artificial satellite 72. In this case, the communication between the artificial satellite 72 and the feeder station 70 may be wireless communication using radio waves such as microwaves, or may be optical communication using laser light or the like. Further, the communication between the HAPS 10 and the artificial satellite 72 is performed by optical communication using laser light or the like.

FIG. 6 is a block diagram showing a configuration example of the wireless relay stations 110 and 210 of the HAPS 10 and 20 of the embodiment.
The wireless relay stations 110 and 210 in FIG. 6 are examples of repeater type wireless relay stations. The wireless relay stations 110 and 210 respectively include a 3D cell forming antenna unit 111, a transmitting / receiving unit 112, a feed antenna unit 113, a transmitting / receiving unit 114, a repeater unit 115, a monitoring control unit 116, and a power supply unit 117. Prepare Further, each of the wireless relay stations 110 and 210 includes an optical communication unit 125 used for inter-HAPS communication and the like, and a beam control unit 126.

  The 3D cell formation antenna unit 111 has an antenna that forms radial beams 100 and 200 toward the cell formation target airspace 40, and forms three-dimensional cells 41 and 42 that can communicate with a terminal device. The transmission / reception unit 112 configures a first wireless communication unit together with the 3D cell formation antenna unit 111, has a duplexer (DUP: DUPlexer), an amplifier, and the like, and includes the three-dimensional cell 41 via the 3D cell formation antenna unit 111. , 42 for transmitting a wireless signal to the terminal device located in the area, and receiving a wireless signal from the terminal device.

  The feed antenna unit 113 has a directional antenna for wireless communication with the feeder station 70 on the ground or at sea. The transmission / reception unit 114 constitutes a second wireless communication unit together with the feed antenna unit 113, has a duplexer (DUP: DUPlexer), an amplifier, etc., and transmits a radio signal to the feeder station 70 via the feed antenna unit 113. To receive a wireless signal from the feeder station 70.

  The repeater unit 115 relays the signal of the transmission / reception unit 112 transmitted / received to / from the terminal device and the signal of the transmission / reception unit 114 transmitted / received to / from the feeder station 70. The repeater unit 115 may have a frequency conversion function.

  The monitoring control unit 116 is composed of, for example, a CPU and a memory, and executes a program incorporated in advance to monitor the operation processing status of each unit in the HAPS 10 and 20 and control each unit. In particular, the monitoring control unit 116 controls the motor drive unit 141 that drives the propellers 103 and 202 by executing the control program to move the HAPS 10 and 20 to the target position and to stay near the target position. To control.

  The power supply unit 117 supplies the power output from the batteries 106 and 204 to each unit in the HAPS 10 and 20. The power supply unit 117 may have a function of storing electric power generated by a solar power generation panel or the like or electric power supplied from the outside in the batteries 106 and 204.

  The optical communication unit 125 communicates with other HAPSs 10 and 20 in the vicinity and the artificial satellite 72 via an optical communication medium such as a laser beam. This communication enables dynamic routing that dynamically relays wireless communication between the terminal device such as the drone 60 and the mobile communication network 80, and when one HAPS fails, another HAPS backs it up. By wirelessly relaying the data, the robustness of the mobile communication system can be enhanced.

  The beam control unit 126 controls the direction and intensity of a beam of laser light or the like used for inter-HAPS communication and communication with the artificial satellite 72, and a relative position with respect to other HAPSs (wireless relay stations) in the vicinity. The other HAPS (wireless relay station) that performs communication using a light beam such as a laser beam is controlled to be switched according to the change of This control may be performed based on, for example, the position and orientation of HAPS itself, the position of surrounding HAPS, and the like. The information on the position and orientation of the HAPS itself is acquired based on the outputs of the GPS receiving device, the gyro sensor, the acceleration sensor, etc. incorporated in the HAPS, and the information on the position of the HAPS around the remote is provided in the mobile communication network 80. It may be obtained from the controller 85 or another HAPS management server.

FIG. 7 is a block diagram showing another configuration example of the wireless relay stations 110 and 210 of the HAPS 10 and 20 of the embodiment.
The wireless relay stations 110 and 210 in FIG. 7 are examples of base station type wireless relay stations.
Note that, in FIG. 7, the same components as those in FIG. 6 are denoted by the same reference numerals, and description thereof will be omitted. Each of the wireless relay stations 110 and 210 in FIG. 7 further includes a modem unit 118, and includes a base station processing unit 119 instead of the repeater unit 115. Further, the wireless relay stations 110 and 210 each include an optical communication unit 125 and a beam control unit 126.

  The modem unit 118 performs demodulation processing and decoding processing on the received signal received from the feeder station 70 via the feed antenna unit 113 and the transmission / reception unit 114, and outputs the data signal to the base station processing unit 119 side. To generate. Also, the modem unit 118 performs encoding processing and modulation processing on the data signal received from the base station processing unit 119 side, and transmits to the feeder station 70 via the feed antenna unit 113 and the transmission / reception unit 114. Generate a signal.

  The base station processing unit 119 has a function as an e-NodeB that performs baseband processing based on, for example, a method based on the LTE / LTE-Advanced standard. The base station processing unit 119 may perform processing by a method that complies with future mobile communication standards such as the fifth generation.

  The base station processing unit 119 executes, for example, demodulation processing and decoding processing on a reception signal received from the terminal device located in the three-dimensional cells 41 and 42 via the 3D cell formation antenna unit 111 and the transmission / reception unit 112. , And generates a data signal to be output to the modem unit 118 side. Also, the base station processing unit 119 performs encoding processing and modulation processing on the data signal received from the modem unit 118 side, and the three-dimensional cells 41 and 42 via the 3D cell forming antenna unit 111 and the transmitting / receiving unit 112. To generate a transmission signal to be transmitted to the terminal device.

FIG. 8 is a block diagram showing still another configuration example of the wireless relay stations 110 and 210 of the HAPS 10 and 20 of the embodiment.
The wireless relay stations 110 and 210 in FIG. 8 are examples of highly functional base station type wireless relay stations having an edge computing function. Note that, in FIG. 8, the same components as those in FIGS. 6 and 7 are denoted by the same reference numerals, and description thereof will be omitted. Each of the wireless relay stations 110 and 210 of FIG. 8 further includes an edge computing unit 120 in addition to the components of FIG. 7.

  The edge computing unit 120 is composed of, for example, a small computer, and can execute various information processing related to wireless relay in the wireless relay stations 110 and 210 of the HAPS 10 and 20 by executing a program installed in advance. it can.

  For example, the edge computing unit 120 determines the transmission destination of the data signal based on the data signal received from the terminal device located in the three-dimensional cell 41, 42, and the relay destination of the communication based on the determination result. Execute the process of switching. More specifically, when the destination of the data signal output from the base station processing unit 119 is a terminal device located in its own three-dimensional cell 41, 42, the data signal is not passed to the modem unit 118. Then, the data is returned to the base station processing unit 119 and transmitted to the terminal device of the transmission destination located in the own three-dimensional cells 41 and 42. On the other hand, when the destination of the data signal output from the base station processing unit 119 is a terminal device located in a cell other than the own three-dimensional cells 41 and 42, the data signal is passed to the modem unit 118. The data is transmitted to the feeder station 70 and is transmitted via the mobile communication network 80 to the terminal device of the transmission destination located in another cell of the transmission destination.

  The edge computing unit 120 may execute a process of analyzing information received from a large number of terminal devices located in the three-dimensional cells 41 and 42. The analysis result may be transmitted to a large number of terminal devices located in the three-dimensional cells 41 and 42, or may be transmitted to a server device of the mobile communication network 80 or the like.

  The uplink and downlink duplex schemes for wireless communication with the terminal device via the radio relay stations 110 and 210 are not limited to specific schemes, and for example, Time Division Duplex (TDD) schemes are also available. Alternatively, a frequency division duplex (FDD) method may be used. Further, the access method of wireless communication with the terminal device via the wireless relay stations 110 and 210 is not limited to a specific method, and for example, an FDMA (Frequency Division Multiple Access) method, a TDMA (Time Division Multiple Access) method, A CDMA (Code Division Multiple Access) system or an OFDMA (Orthogonal Frequency Division Multiple Access) system may be used. In addition, the wireless communication has functions such as diversity coding, transmission beamforming, and space division multiplexing (SDM), and a plurality of antennas are simultaneously used for both transmission and reception to enable a unit frequency per unit frequency. A MIMO (Multi-Input and Multi-Output) technology that can increase the transmission capacity of the above may be used. The MIMO technology may be SU-MIMO (Single-User MIMO) technology in which one base station transmits a plurality of signals at the same time and the same frequency as one terminal device, or one base station has a plurality of signals. Even in the MU-MIMO (Multi-User MIMO) technique in which signals are transmitted to different communication terminal devices at the same time and the same frequency, or a plurality of different base stations transmits signals to one terminal device at the same time and the same frequency. Good.

  In the present embodiment, the HAPS 10 may fail in the sky and fall, causing damage to the drop point. For example, when a plurality of HAPS 10 fly in a formation as shown in FIG. 9, adjacent HAPS 10 collide with each other to cause a failure, and when the failed HAPS 10 descends and falls, damage may occur at the drop point. is there.

  Therefore, in the present embodiment, in order to enhance the safety during operation of the HAPS 10, the following HAPS flight control and countermeasures against failure and fall are taken. For example, in the present embodiment, the flight control is performed so that the HAPSs 10 communicate with each other during the formation flight of the HAPS to avoid a collision.

  FIG. 10 is a flowchart showing an example of collision avoidance flight control of the HAPS 10 during formation flight, and FIG. 11 is an explanatory diagram showing an example of collision avoidance flight of the HAPS 10 during formation flight. Although only the solar plane type HAPS 10 is shown here, the unmanned airship type HAPS 20 may be used, or these HAPS 10 and 20 may be mixed.

  In FIG. 10, when a plurality of HAPSs 10 of the present embodiment fly in a formation, the HAPS 10 uses a communication between HAPSs such as optical communication to cause a predetermined signal for establishing communication with a surrounding HAPS 10 ′ at predetermined intervals. Is wirelessly transmitted (S101) and waits for reception of a response signal (ACK signal) to the transmission signal. When the response signal (ACK signal) is received (Yes in S102), the HAPS 10 establishes communication with the surrounding HAPS 10 '(S103) and exchanges the current position information with the flight schedule route information (S104). . When the HAPS 10 determines that there is a possibility of collision based on the current position information received from the surrounding HAPS 10 ′ and the route information of the flight schedule (Yes in S105), the HAPS 10 moves within a certain area 10R centered on the HAPS 10. The flight path of the HAPS 10 itself is changed so that the surrounding HAPS 10 'does not enter (see FIG. 11) (S106). This information exchange and flight route change are repeated until there is no possibility of collision (S104 to S106), and then the communication between HAPSs is disconnected (S107).

  In addition, in the example of FIG. 10, the flight path of the HAPS 10 itself is changed. However, the flight from the HAPS 10 to the surrounding HAPS 10 ′ is performed so that the surrounding HAPS 10 ′ does not enter the area 10R of a certain range centered on the HAPS 10. The flight path of the surrounding HAPS 10 ′ may be changed by transmitting the control information. The flight control that does not collide with the HAPS 10 ′ around the HAPS 10 may be manually and remotely performed from the remote control device 85 based on the position information of each HAPS.

  Further, in the present embodiment, in order to enhance the safety at the time of failure of the HAPS 10, when a failure accompanied by the lowering of the HAPS 10 occurs, a safe fall based on the information of the surrounding airflow so as to reduce the damage caused by the failed HAPS 101. The target location is predicted, the HAPS 10 is disassembled, and the HAPS 10 is dropped to the safe fall target location as much as possible.

  FIG. 12 is an explanatory diagram of the HAPS 10 including a plurality of partial structural bodies 10A to 10E connected by the connection portions 151 and 152 that can be released from the connection. FIG. 12A is a top view showing an example of the HAPS 10 composed of a plurality of partial structures 10A to 10E, and FIG. 12B shows the partial structures 10A to 10E after the HAPS 10 has been decoupled and disassembled. It is a top view. FIG. 13 is a block diagram showing an example of a control system for disconnecting the partial structures 10A to 10E in the HAPS 10.

  Although FIG. 12 shows the case where the number of the partial structures 10A to 10E forming the HAPS 10 is 5, the number of the partial structures may be 2 to 4 or 6 or more. Further, the positions and structures of the connecting portions of the partial structures 10A to 10E are not limited to those shown in the drawings. Further, although FIG. 12 shows the case where the HAPS 10 has the tail 150, the HAPS 10 of the present embodiment does not require the tail and the tail 150 and the connecting portion 152 thereof may not be provided.

  In the configuration example illustrated in FIGS. 12 and 13, the partial structures 10A to 10E of the HAPS 10 are connected by the plurality of connecting portions 151 of the main wing portion 101 and the connecting portions 152 of the plurality of tail wings 150. Each of the plurality of connecting portions 151 and 152 is composed of a pair of connecting portion constituting members 151A to 151E and 152A to 152E which are combined and connected so as to face each other. The connection releasing mechanism that selectively releases the connection of the plurality of partial structures 10A to 10E can selectively connect or separate the corresponding connecting portion constituent members. As the decoupling mechanism, various mechanisms can be used. For example, a coupling / separation mechanism using an electromagnet, a mechanical coupling / separation mechanism using a clamp or a spring, or a combination thereof can be used. it can. The mechanical coupling / separation mechanism may have an actuator such as a servo and can be decoupled by an electric signal. Further, the connection release mechanism may have a release mechanism by deformation of a shape memory alloy or thermoplastic resin using Joule heat.

  When the control unit 153 receives the failure occurrence notification that the failure accompanied by the lowering of the HAPS 10 has occurred, the disassembly control generated so as to cause the HAPS 10 to fall to a safe fall target location predicted based on the information of the surrounding airflow. The disconnecting mechanism 154 is controlled based on the information. The connection releasing mechanism 154 releases the connection of some or all of the plurality of connecting portions 151 and 152 based on the control signal from the control portion 153.

  Note that in the control system of FIG. 13, the control unit 153 controls the position and the number (division number) of the connection portions to be released from the connection among the plurality of connection portions 151 and 152, and the timing to release the connection (for example, At least one of the time information) may be controlled. In addition, the control unit 153 selects a combination of decoupling that has the highest probability of falling to the safe fall target location from a plurality of combinations of decoupling of the partial structures 10A to 10E and decomposes it into a partial structure. May be controlled as follows. The selection information of this combination of disconnection may be included in the disassembly control information sent to the control unit 153.

  FIG. 14 is a sequence diagram showing an example of control when the HAPS 10 fails in the communication system of the embodiment. In addition, FIG. 15 is an explanatory diagram illustrating an example of a state in which the HAPS 10 is disassembled and dropped. Although FIG. 14 shows the case where the HAPS 10 ′ in the vicinity detects the failure occurrence of the HAPS 10, the HAPS 10 itself may detect the failure occurrence of the HAPS 10. In addition, when there are a plurality of peripheral HAPS 10 ', the peripheral HAPS 10' that has detected the failure occurrence of the HAPS 10 may notify the detection result to other peripheral HAPS 10 '.

  In FIG. 14, when a failure accompanied by a drop occurs in the HAPS 10 (S201), the failure is detected by one or a plurality of HAPS 10 'around the external device (S202). For example, the peripheral HAPS 10 ′ determines that a failure of the HAPS 10 occurs when the HAPS 10 detects a drop of a predetermined threshold value or more by performing inter-HAPS communication such as optical communication with the HAPS 10. When the HAPS 10 ′ in the vicinity detects the occurrence of a failure in the HAPS 10, the HAPS 10 ′ transmits the failure notification to the HAPS 10 and the remote control device 85 as a management device (external device) provided in the ground or sea control center (S203). , S204).

  When the remote control device 85 receives the failure occurrence notification of the HAPS 10 from the surrounding HAPS 10 ′, it predicts a safe fall target location of the HAPS 10 (the partial structures 10A to 10E) based on the information of the air flow around the HAPS 10 (S205). . For example, the remote control device 85 includes a wind speed and a wind direction of the surrounding airflow at the time of occurrence of a failure, a moving speed and a moving direction of the HAPS 10 in which the failure has occurred, the HAPS 10 in which the failure has occurred, or a plurality of partial structural bodies constituting the HAPS 10. Based on the masses or masses of 10A to 10E and the outer size, the safe falling target locations of the partial structures 10A to 10E of the HAPS 10 are predicted. The remote control device 85 generates disassembly control information so that the HAPS 10 (partial structures 10A to 10E) is dropped to the safe fall target location (S206), and transmits it to the HAPS 10 (S207). This disassembly control information may include selection information for the above-described combination of disconnection.

  It should be noted that the prediction of the target drop location and the generation of the disassembly control information are performed by a database (“HAPS fall management database (DB)”) as a storage unit that stores information about the fall of the HAPS during the past fall and information during the drop test. (Also referred to as "."). The HAPS fall management database includes information indicating the wind velocity and direction of the surrounding airflow, the moving velocity and moving direction of HAPS, the mass or mass and outer size of HAPS or its partial structure, and the magnitude of correlation with the falling location. But it's okay. Here, the data of the falling place may be relative position data (for example, radius and direction) based on the position of the HAPS or the partial structure before falling and descending.

  Upon receiving the disassembly control information from the remote control device 85, the HAPS 10 controls so as to release the connection of some or all of the plurality of connection units 151 and 152 based on the disassembly control information (S208). As described above, the HAPS 10 executes the connection release control for controlling the position and the number of the connection portions of the plurality of connection portions 151 and 152, which are the connection release objects to release the connection. This connection release control may include control of the timing of releasing the connection.

  Each of the partial structures 10A to 10E disassembled at the predetermined connecting portion of the HAPS 10 starts disassembly and fall as shown in FIG. 15 and falls to a safe fall target location. As a result, it is possible to suppress the occurrence of damage at the dropping place when the HAPS 10 fails and to improve safety. In particular, in the present embodiment, the probability that the HAPS 10 will fall to the predicted safe fall target location can be increased by disassembling the HAPS 10 into the partial structures 10A to 10E and dropping them.

In the control example of FIG. 14 described above, each of the partial structures 10A to 10E of the HAPS 10 falls onto a terminal device such as a user device (UE) in the vicinity located at a drop location on the ground or at the sea where each partial structure falls. You may fall while transmitting an alarm signal (fall alarm) (S209). In this case, partial structure 10A~10E includes a control communication terminal device can send a fall alarm signal to the terminal device via the periphery of HAPS10 '(e.g., a mobile communication module) and emergency power supply are incorporated, Terminal identification information (for example, an IP address, a telephone number, etc.) may be assigned so that it can be identified by the HAPS 10 'and the terminal device in the vicinity. The user of the terminal device that has received the fall warning signal can evacuate indoors such as a building.

  In addition, the fall alarm signal is generated when the HAPS 10 or its substructures 10A to 10E cannot fall to a safe fall target location, that is, when the HAPS 10 or its substructures 10A to 10E are falling toward a location deviating from the fall target location (actual fall location) Alternatively, it may be transmitted to a terminal device such as a user device located at an actual drop location.

Further, when the HAPS 10 descending due to a failure or the partial structures 10A to 10E thereof are in a state where communication is not possible, one or a plurality of peripheral HAPS 10 'located around the HAPS 10 descending due to the failure, and a remote control device 85, the to the terminal device, such as a user equipment located in a safe drop target location or the actual drop locations, drop alarm signal (falling alarm) may be transmitted. The remote control device 85, the the terminal device such as a user equipment located in a safe drop target location or the actual drop location may transmit a drop alarm signal.

  Further, in the control example of FIG. 14 described above, the HAPS 10 in which a failure has occurred may detect a change in its own altitude and detect the occurrence of a failure based on the change in the altitude. Further, the HAPS 10 in which the failure has occurred may receive from the remote control device 85 information (failure occurrence notification) regarding the occurrence of the failure accompanied by the descending of itself.

  Further, in the control example of FIG. 14 described above, the HAPS 10 in which the failure has occurred may predict the drop target location and generate the disassembly control information. Alternatively, the surrounding HAPS 10 'may predict the fall target location, generate the disassembly control information, and transmit the generated disassembly control information to the HAPS 10 as information about the fall target location.

  Further, in the present embodiment, the drop target location is a HAPS drop management obtained by a drop test performed on the HAPS 10 or a plurality of partial structures 10A to 10E constituting the HAPS 10 and machine learning using the test data. You may make a prediction based on a database.

FIG. 16 is a flowchart showing an example of centralized management processing using the HAPS fall management database of the remote control device 85 (control center) in the communication system of the embodiment.
In FIG. 16, the remote control device 85 collects test result data for a plurality of drop tests that have been attempted for each of the HAPS 10 or the plurality of partial structures 10A to 10E under a plurality of different types of conditions (S301). The data of the test result includes the data of the wind speed and the wind direction of the airflow at the time of the test, and the data of the actual falling location. The data of the test result may include the data of the moving speed and the moving direction of the HAPS 10 or the partial structures 10A to 10E before dropping, and the data of the mass or the mass and the outer size of the HAPS 10 or the partial structures 10A to 10E. Further, the test result data may be received and acquired from the test apparatus used for the drop test, or may be acquired by inputting by the operator of the drop test or the like.

  Next, the remote control device 85 executes machine learning based on the test result data of the HAPS 10 or the partial structures 10A to 10E (S302). This machine learning is performed, for example, by artificial intelligence (AI), the wind speed and direction of the air flow, the moving speed and moving direction of the HAPS or substructure, and the mass or mass and external size of the HAPS or substructure, and the HAPS or substructure. The size of the correlation with the place where the body actually falls is calculated and obtained. Here, the data of the falling place may be relative position data (for example, radius and direction) based on the position of the HAPS or the partial structure before falling and descending.

  Next, the remote control device 85 updates the HAPS fall management database based on the result of the machine learning so as to improve the prediction accuracy of the drop locations of the HAPS and the partial structure (S303).

  Next, when a failure accompanied by the descent of the HAPS 10 in operation is detected, the remote control device 85 receives the failure HAPS information regarding the failure HAPS (S304). The failure HAPS information includes, for example, the wind speed and the wind direction of the surrounding airflow at the time of the failure, the moving speed and the moving direction of the HAPS 10 in which the failure has occurred, the HAPS 10 in which the failure has occurred, or a plurality of partial structures 10A constituting the HAPS 10. Mass or mass and external size of 10E.

  The remote control device 85 predicts the safe fall target location of the HAPS 10 or the substructures 10A to 10E based on the received failure HAPS information and the HAPS fall management database (S305), and generates the disassembly control information of the HAPS 10. (S306), the generated disassembly control information is transmitted to the failed HAPS 10 (S307). Here, the disassembly control information includes information that specifies the position and the number of the connection portions to be released from the connection among the plurality of connection portions 151 and 152 of the HAPS 10. The disassembly control information may include a timing for releasing the connection (for example, time information). In addition, the disassembly control information may include selection information that selects a combination of disconnection that has the highest probability of falling to the safe target drop location from a plurality of combinations of disconnection of the partial structures 10A to 10E.

  After the partial structures 10A to 10E of the HAPS 10 disassembled based on the disassembly control information fall, the remote control device 85 receives the fall result data and performs machine learning so as to improve the prediction accuracy of the fall target location. , The HAPS fall management database may be updated (S308, S302, S303). The fall result data includes information on the place where the partial structures 10A to 10E of the HAPS 10 actually fell. The fall result data may include the wind speed and the wind direction of the airflow at a plurality of altitudes measured during the fall in which the partial structures 10A to 10E of the HAPS 10 are falling, or the partial structures 10A to 10E measured during the fall. It may also include device status information such as the drop rate of 10E. Further, the fall result data may be received from the fallen HAPS 10 or the partial structures 10A to 10E having a communication function, or may be received from the surrounding HAPS 10 ′ located around the fallen HAPS 10. Good.

  It should be noted that the processing steps described in the present specification and wireless relay stations of communication relay devices such as HAPS 10 and 20, feeder stations, remote control devices, terminal devices (user devices, mobile stations, communication terminals) and base stations in base stations. The components of the device can be implemented by various means. For example, these processes and components may be implemented in hardware, firmware, software, or a combination thereof.

  As for hardware implementation, the entity (for example, wireless relay station, feeder station, base station device, wireless relay station device, terminal device (user device, mobile station, communication terminal), remote control device, hard disk drive device, or optical disk In the drive device), means such as a processing unit used for realizing the steps and components are one or a plurality of application-specific ICs (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs). ), Programmable logic device (PLD), field programmable gate array (FPGA), processor, controller, microcontroller, microprocessor, electronic device, designed to perform the functions described herein. Other electronic units, comps Over data, or it may be implemented in a combination thereof.

  Also, for firmware and / or software implementations, means such as processing units used to implement the components are programs (eg, procedures, functions, modules, instructions) that perform the functions described herein. , Etc.) may be implemented. In general, any computer / processor readable medium embodying firmware and / or software code, means, such as a processing unit, used to implement the steps and components described herein. May be used to implement. For example, firmware and / or software code may be stored in memory and executed by a computer or processor, eg, at the controller. The memory may be mounted inside the computer or the processor, or may be mounted outside the processor. The firmware and / or software code may be, for example, random access memory (RAM), read only memory (ROM), non-volatile random access memory (NVRAM), programmable read only memory (PROM), electrically erasable PROM (EEPROM). ), A FLASH memory, a floppy disk, a compact disk (CD), a digital versatile disk (DVD), a magnetic or optical data storage device, etc., and may be stored on a computer or processor readable medium. Good. The code may be executed by one or more computers or processors, or may cause the computers or processors to perform the functional aspects described herein.

  Also, the description of the embodiments disclosed herein is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to this disclosure will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the spirit or scope of this disclosure. Therefore, the present disclosure should not be limited to the examples and designs described herein, but should be admitted to the broadest extent consistent with the principles and novel features disclosed herein.

10 HAPS (Solar plane type)
10A-10E Partial structure 20 HAPS (airship type)
40 Cell formation target air space 41, 42, 43 Three-dimensional cell 50 Air space where HAPS is located 60 Drone 65 Airplane 70 Feeder station 72 Artificial satellite 75 Microwave feeding station 80 Mobile communication network 85 Remote control device (control center)
100, 200, 300 beam 101 main wing 102 solar panel (solar power generation panel)
103,202 Propeller 104 Connecting part 105 Pod 106 Battery 107 Wheel 108 Power receiving pod 110,210 Wireless relay station 111 Three-dimensional (3D) cell forming antenna part 112 Transmitting / receiving part 113 Feeding antenna part 114 Transmitting / receiving part 115 Repeater part 116 Monitoring control Part 117 Power supply part 118 Modem part 119 Base station processing part 120 Edge computing part 125 Optical communication part 126 Beam control part 130,230 Optical antenna device 141 Motor drive part 150 Tail 151,152 Connection part 151A-151E Connection after disconnection Part configuration members 152A to 152E Connection part configuration member 153 after connection release 153 Control unit 154 Connection release mechanism

Claims (29)

An aerial levitation type communication relay device comprising a wireless relay station that performs wireless communication with a terminal device, and a levitation body that is controlled to be located in an air space of a predetermined altitude by autonomous control or control from the outside. hand,
When a failure accompanying the lowering of the communication relay device itself occurs, a means for dropping the communication relay device itself to a predetermined drop target location predicted based on information of the surrounding airflow,
It is composed of multiple partial structures that are connected by a connection part that can be disconnected.
A connection releasing mechanism for selectively releasing the connection of the plurality of partial structures,
A communication relay device, comprising: a control unit that controls the connection release by the connection release mechanism so that the selectively disconnected partial structure falls to the drop target location. The communication relay device according to claim 1,
The communication relay device according to claim 1, wherein the control unit controls at least one of a position and the number of connecting units for releasing the connection and a timing for releasing the connection. The communication relay device according to claim 1 or 2,
The control unit selects a combination of decoupling that has the highest probability of falling to the fall target location from a plurality of combinations of decoupling of the plurality of partial structures, and decomposes the combination into the partial structures. A communication relay device characterized by controlling. The communication relay device according to any one of claims 1 to 3,
The communication relay device, wherein each of the plurality of partial structures falls while transmitting a drop warning signal to a terminal device located at a place where the partial structures fall. The communication relay device according to any one of claims 1 to 4,
A communication relay device, wherein the communication relay device falls while transmitting a fall warning signal to a terminal device located at a place where the fall of the communication relay device itself is predicted. The communication relay device according to any one of claims 1 to 5,
When a failure accompanied by descent occurs in another communication relay device located in the vicinity, the terminal device is located in a place where the fall of the other communication relay device is predicted, or the other communication relay device is configured. A communication relay device , wherein a fall warning signal is transmitted to a terminal device located at a place where a plurality of substructures connected by a connection unit that can be released from connection is predicted to fall. The communication relay device according to any one of claims 1 to 6,
A communication relay device, which detects a change in altitude of another communication relay device located in the vicinity, and detects the occurrence of a failure accompanying the descent of the other communication relay device based on the change in altitude. A wireless relay station that performs wireless communication with the terminal device,
An aerial levitation type communication relay device comprising: a levitation body that is controlled to be located in an air space of a predetermined altitude by autonomous control or control from the outside,
When a failure accompanying the lowering of the communication relay device itself occurs, a means for dropping the communication relay device itself to a predetermined drop target location predicted based on information of the surrounding airflow,
A communication relay device, wherein the communication relay device falls while transmitting a fall warning signal to a terminal device located at a place where the fall of the communication relay device itself is predicted. The communication relay device according to claim 8,
When a fault accompanied by lowering the other communication relay device located around has occurred, characterized in that falling of the other communication relay equipment transmits a fall alarm signal to the terminal device located in a location that can be predicted Communication relay device. The communication relay device according to claim 8 or 9,
A communication relay device, which detects a change in altitude of another communication relay device located in the vicinity, and detects the occurrence of a failure accompanying the descent of the other communication relay device based on the change in altitude. A wireless relay station that performs wireless communication with the terminal device,
An aerial levitation type communication relay device comprising: a levitation body that is controlled to be located in an air space of a predetermined altitude by autonomous control or control from the outside,
When a failure accompanying the lowering of the communication relay device itself occurs, a means for dropping the communication relay device itself to a predetermined drop target location predicted based on information of the surrounding airflow,
When a failure accompanied by descent occurs in another communication relay device located in the vicinity, the terminal device is located in a place where the fall of the other communication relay device is predicted, or the other communication relay device is configured. A communication relay device , wherein a fall warning signal is transmitted to a terminal device located at a place where a plurality of substructures connected by a connection unit that can be released from connection is predicted to fall. The communication relay device according to claim 11,
A communication relay device, which detects a change in altitude of another communication relay device located in the vicinity, and detects the occurrence of a failure accompanying the descent of the other communication relay device based on the change in altitude. A wireless relay station that performs wireless communication with the terminal device,
An aerial levitation type communication relay device comprising: a levitation body that is controlled to be located in an air space of a predetermined altitude by autonomous control or control from the outside,
When a failure accompanying the lowering of the communication relay device itself occurs, a means for dropping the communication relay device itself to a predetermined drop target location predicted based on information of the surrounding airflow,
A communication relay device, which detects a change in altitude of another communication relay device located in the vicinity, and detects the occurrence of a failure accompanying the descent of the other communication relay device based on the change in altitude. The communication relay device according to any one of claims 1 to 13,
A communication relay device, comprising means for receiving from an external device information regarding the occurrence of a failure accompanying the lowering of the communication relay device itself. The communication relay device according to any one of claims 1 to 14,
A communication relay device comprising means for receiving information on the target fall location from an external device. The communication relay device according to claim 14 or 15,
The communication relay device, wherein the external device is a management device on the ground or in the air that manages the communication relay device. The communication relay device according to claim 14 or 15,
The external device is located in the periphery and includes a wireless relay station that performs wireless communication with the terminal device and a levitation body that is controlled to be located in an air space of a predetermined altitude by autonomous control or control from the outside. Alternatively, the communication relay device is a plurality of other communication relay devices. A wireless relay station that performs wireless communication with the terminal device,
An aerial levitation type communication relay device comprising: a levitation body that is controlled to be located in an air space of a predetermined altitude by autonomous control or control from the outside,
A means for dropping the communication relay device itself to a predetermined drop target location predicted on the basis of the information of the surrounding airflow when a failure accompanying the lowering of the communication relay device itself occurs,
Means for receiving from the external device information regarding the occurrence of a failure accompanying the descending of the communication relay device itself,
The external device is located in the periphery and includes a wireless relay station that performs wireless communication with the terminal device and a levitation body that is controlled to be located in an air space of a predetermined altitude by autonomous control or control from the outside. Alternatively, the communication relay device is a plurality of other communication relay devices. The communication relay device according to claim 18,
A communication relay device comprising means for receiving information on the target fall location from an external device. A wireless relay station that performs wireless communication with the terminal device,
An aerial levitation type communication relay device comprising: a levitation body that is controlled to be located in an air space of a predetermined altitude by autonomous control or control from the outside,
A means for dropping the communication relay device itself to a predetermined drop target location predicted on the basis of the information of the surrounding airflow when a failure accompanying the lowering of the communication relay device itself occurs,
Means for receiving information about the fall target location from an external device,
The external device is located in the periphery and includes a wireless relay station that performs wireless communication with the terminal device and a levitation body that is controlled to be located in an air space of a predetermined altitude by autonomous control or control from the outside. Alternatively, the communication relay device is a plurality of other communication relay devices. The communication relay device according to any one of claims 1 to 20,
A communication relay device comprising means for detecting a change in altitude of the communication relay device itself and detecting occurrence of the failure based on the change in altitude. The communication relay device according to any one of claims 1 to 21,
A communication relay device comprising means for predicting the fall target location. The communication relay device according to any one of claims 1 to 22,
The drop target location is the wind speed and direction of the surrounding airflow at the time of the occurrence of the failure, the moving speed and direction of the communication relay apparatus in which the failure has occurred, and the mass or mass and outer shape of the communication relay apparatus in which the failure has occurred. The communication relay device is estimated based on the size or the mass or mass and the outer size of a plurality of partial structures that are connected by a connection-releasable connection part that constitutes the communication relay device in which the failure has occurred. . The communication relay device according to any one of claims 1 to 23,
The target drop location is connected by a result of machine learning obtained by a plurality of drop tests executed under a plurality of different types of conditions for the communication relay device, or by a disconnectable connection part that constitutes the communication relay device. A communication relay device , which is predicted based on a result of machine learning obtained by a plurality of drop tests executed under a plurality of different types of conditions for a plurality of generated partial structures. The communication relay device according to any one of claims 1 to 24,
A three-dimensional cell is formed in a predetermined cell formation target air space between the ground and the sea surface,
The altitude of the cell formation target airspace is 10 [km] or less,
The altitude of the air space where the floating body is located is 100 [km] or less. A system comprising a plurality of communication relay devices according to any one of claims 1 to 25,
Each of the plurality of communication relay devices exchanges position information and scheduled route information of the communication relay device with each other, and controls a moving route so as not to approach a range less than or equal to a predetermined distance or less than a predetermined distance. system. A management device for managing the communication relay device according to any one of claims 1 to 25, which is located on the ground or in the sky.
A management device, which predicts a fall target location of the communication relay device in which the failure has occurred, and transmits information regarding the predicted fall target location to the communication relay device in which the failure has occurred. The management device according to claim 27,
In a terminal device located in a place where the communication relay device is expected to fall, or in a place where a plurality of partial structural bodies connected by a connection-releasable connection part that constitutes the communication relay device are expected to fall. the terminal device located, management apparatus and transmits a fall alarm signal. A ground that manages an aerial levitation type communication relay device including a wireless relay station that performs wireless communication with a terminal device and a levitation body that is controlled so as to be located in an air space of a predetermined altitude by autonomous control or control from the outside. Or a management device located in the sky,
When a failure accompanying the lowering of the communication relay device itself occurs, a means for dropping the communication relay device itself to a predetermined drop target location predicted based on information of the surrounding airflow,
Predicting the fall target location of the communication relay device in which the failure has occurred, and transmitting information about the predicted fall target location to the communication relay device in which the failure has occurred,
In a terminal device located in a place where the communication relay device is expected to fall, or in a place where a plurality of partial structural bodies connected by a connection-releasable connection part that constitutes the communication relay device are expected to fall. the terminal device located, management apparatus and transmits a fall alarm signal.