JP2021044774A - Radio relay system - Google Patents

Abstract

To provide a radio relay system that achieves even in mountains and forests a longer relay distance between a fixed base station and a master unit and between the master unit and a slave unit to ensure a targeted coverage for radio communication in an out of coverage area of the fixed base station.SOLUTION: The system comprises a first radio relay station that can communicate with a fixed base station via radio and is mounted on a floating body capable of staying in midair and a second radio relay station that is mounted on a flying craft capable of staying in midair within a coverage for radio communication with the first radio relay station and relays radio communication between the first radio relay station and a user device.SELECTED DRAWING: Figure 1

Description

The present invention relates to a wireless relay system.

Conventionally, for relay antennas and anti-mobile stations in weak electric field areas such as insensitive areas, mountain areas, and marine areas where there are obstacles that obstruct the line-of-sight propagation of radio waves between the antennas of fixed base stations on the ground. A wireless relay system that performs wireless relay by a drone or a moored balloon equipped with a wireless relay station having an antenna is known (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2016-002973

In the above-mentioned conventional wireless relay system, since it is difficult to wirelessly communicate between the fixed base station and the wireless relay station mounted on the drone or mooring balloon in the area outside the fixed base station, the fixed base station and the user device (mobile station). ) May not be able to relay wireless communication. Therefore, the applicant mounts a wireless relay station (master unit) including a frequency converter on a vehicle that can move on the ground, moves to the destination (site) where the wireless relay is performed, and receives radio waves from the fixed base station. By receiving on the master unit and establishing wireless communication between the master unit and the wireless relay station (slave unit) mounted on the drone as an air vehicle, the fixed base station and the user device (mobile station) can be used. We have proposed a wireless relay system for wireless communication between the two (see Japanese Patent Application No. 2017-045122, Japanese Patent Application No. 2018-004142, Japanese Patent Application No. 2018-055632).

The wireless relay system may be used in a place such as a mountain or a forest where there are many obstacles that hinder the line-of-sight propagation of radio waves from a fixed base station (for example, an environment near a distress site). In such a place, the line between the master unit and the fixed base station is often out of sight, and it is difficult to find the installation location of the master unit that is within the communication range of the fixed base station near the distress site. In particular, when relaying radio waves from multiple communication operators (telecommunications carriers) at the same time, the location where the master unit is installed must be within the entire communication range of the relaying communication operator, so search for the location where the master unit is installed. Becomes more and more difficult. Furthermore, the place where a vehicle equipped with a wireless relay station (master unit) can enter is often a place away from the distress site. Therefore, the location where the master unit is installed is often far away from the vicinity of the distress site, and the distance between the master unit and the slave unit becomes long, or the master unit and the slave unit are out of sight due to obstacles. Therefore, it may not be possible to construct a communication area in the target area including the real search site that is presumed to be the distress site.

The wireless relay system according to one aspect of the present invention is a wireless relay system that relays wireless communication between a fixed base station of a mobile communication network and a user device, and is located in an aerial area capable of wireless communication with the fixed base station. Between the first radio relay station mounted on the levitation body capable of staying and the first radio relay station mounted on the air vehicle capable of staying in an aerial area capable of wireless communication with the first radio relay station and the user device. A second wireless relay station that relays the wireless communication of the above is provided.
In the wireless relay system, the antenna for communicating with the fixed base station of the first wireless relay station may be an omnidirectional antenna.
Further, in the wireless relay system, electric power may be supplied from the ground to the first wireless relay station mounted on the floating body.

According to the present invention, the relay distance between the fixed base station and the master unit and the relay distance between the master unit and the slave unit can be increased even in a place such as a mountain or a forest, and the relay distance between the fixed base station and the slave unit can be increased. A wireless communication area can be reliably constructed in the target area located in.

The schematic block diagram which shows an example of the whole structure of the communication system including the wireless relay system which concerns on one Embodiment of this invention. The schematic block diagram which shows an example of the whole structure of the communication system including the wireless relay system which concerns on another embodiment. (A) is an explanatory diagram of a problem of a wireless relay system according to a comparative example, and (b) is an explanatory diagram of an effect of the wireless relay system of the present embodiment. The block diagram which shows an example of the main part composition of the 1st wireless relay station (master unit) and the 2nd wireless relay station (slave unit) of the wireless relay system which concerns on embodiment. The block diagram which shows the other example of the main part composition of the 1st wireless relay station (master unit) and the 2nd wireless relay station (slave unit) of the wireless relay system which concerns on embodiment. FIG. 3 is a block diagram showing still another example of the main part configuration of the first wireless relay station (master unit) and the second wireless relay station (slave unit) of the wireless relay system according to the embodiment. FIG. 3 is a block diagram showing still another example of the configuration of the main parts of the first wireless relay station (master unit) and the second wireless relay station (slave unit) of the wireless relay system according to the embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 are schematic configuration diagrams showing an example of an overall configuration of a communication system including a wireless relay system according to an embodiment of the present invention, respectively. The wireless relay system of the present embodiment is equipped with a wireless relay station on an air vehicle such as a drone or a moored balloon when searching for a victim such as a mountain or a forest in the event of a disaster, and wirelessly covers an area outside the fixed base station. It is a temporary wireless relay system that can carry out relay. In particular, the wireless relay system of the present embodiment has a simple configuration, and after moving to a target position, wireless communication between a fixed base station of a mobile communication network of a plurality of communication operators (mobile communication carriers) and a user device. Can be started promptly.

In FIG. 1, the wireless relay system according to the present embodiment includes a first wireless relay station (hereinafter, also referred to as “master unit”) 10 and a second wireless relay station (hereinafter, also referred to as “slave unit”) 20. .. The first wireless relay station (master unit) 10 and the second wireless relay station (slave unit) 20 are of mobile communication networks 80A and 80B of a plurality of communication operators (communication carriers) A and B having different radio signal frequencies. Wireless communication between a plurality of fixed base stations 30A and 30B such as macrocell base stations connected to each core network and a plurality of mobile stations 40A and 40B as user devices corresponding to the plurality of communication operators A and B respectively. Are relayed at the same time. The master unit 10 and the slave unit 20 are time-synchronized with each other by using a signal received from a GPS satellite or the like.

In this embodiment, the case where the number of communication operators (fixed base stations) is 2, but the number of communication operators (fixed base stations) may be 3 or more. Further, in FIG. 1, the number of mobile stations corresponding to each of the communication operators A and B is 1, but the number of mobile stations corresponding to each of the communication operators A and B may be 2 or more.

The mobile communication networks 80A and 80B may be provided with remote control devices 81A and 81B (remote control sources), respectively. The remote control devices 81A and 81B hold, for example, information on the first radio relay station 10 and the second radio relay station 20, and transmit control information to at least one of the first radio relay station 10 and the second radio relay station 20. be able to. Further, the remote control devices 81A and 81B may function as information transmission destinations and may receive information from at least one of the first radio relay station 10 and the second radio relay station 20. The remote control devices 81A and 81B may be provided in a place other than the mobile communication networks 80A and 80B as long as they can communicate with the first wireless relay station 10 and the second wireless relay station 20. Further, the control of the first radio relay station 10 and the second radio relay station 20 may be performed by both the remote control devices 81A and 81B, or may be performed by either one of the remote control devices 81A and 81B. Good. Further, the remote control device 81C may be installed on a common communication network 80C other than the mobile communication networks 80A and 80B of each communication operator.

In the common communication network 80C, the drone 60 as an air vehicle equipped with the first radio relay station (master unit) 10 was remotely controlled, and the second radio relay station (slave unit) 20 was mounted. A remote control device (hereinafter, referred to as “remote drone control device”) 82 for remotely controlling the drone 70 as an air vehicle may be provided.

The remote control devices 81A, 81B, 81C are, for example, a server, a PC or a tablet terminal capable of communicating with the first wireless relay station 10 or communicating with the first wireless relay station 10 and the second wireless relay station 20. There may be. Further, the remote drone control device 82 can communicate with the control units of the drones 60 and 70 via the first radio relay station 10 or via the first radio relay station 10 and the second radio relay station 20. It may be a server, a PC or a tablet terminal.

The first wireless relay station 10 is also referred to as a first frequency (hereinafter, also referred to as “radio relay frequency” or “base station side frequency”) to be relayed between the fixed base stations 30A and 30B for each communication operator A and B. ) The second frequency (hereinafter referred to as "intermediate frequency") between the radio signals of F1A (downlink signal) and F1A'(uplink signal) and F1B (downlink signal) and F1B'(uplink signal) and the second radio relay station 20. Also referred to as) F2A (downlink signal) and F2A'(uplink signal) and F2B (downlink signal) and F2B'(uplink signal) radio signals are relayed by a frequency conversion type wireless relay device.

The first radio relay station 10 is mounted on the drone 60 as an air vehicle, which is a floating body that stays or moves in a predetermined airspace by autonomous control or external control. The drone 60 equipped with the first wireless relay station 10 is transported to a target position on the ground by a vehicle (radio relay vehicle) 50 so as to stay above a predetermined altitude (for example, 100 to 150 m) from the ground. Flight controlled.

The vehicle 50 that carries and moves the drone 60 and the first radio relay station 10 to the target position on the ground supplies electric power to the first radio relay station 10 and the drone 60 for a long time, such as an electric vehicle, a hybrid vehicle, and a fuel cell vehicle. It is equipped with a supplyable battery and generator. Electric power is supplied to the flight drive unit of the drone 60 and the first radio relay station 10 from a battery or a generator mounted on the automobile 50 on the ground via a cable 61.

In the present embodiment, the drone 60 is equipped with the first radio relay station 10 to stay above the automobile 50, but the first radio relay station 10 is mounted on a floating body such as a mooring balloon to be an automobile. You may stay above 50.

As shown in FIG. 2, the radio signal between the first radio relay station 10 and the second radio relay station 20 is a second frequency (hereinafter, also referred to as “intermediate frequency”) F2 (downlink signal) common to communication operators. ) And F2'(uplink signal) radio signals. Further, each communication operator A and B may use the wireless relay in a time division manner.

Hereinafter, F1A (downlink signal) and F1A'(uplink signal) are collectively referred to as "F1A / F1A'", and F1B (downlink signal) and F1B'(uplink signal) are collectively referred to as "F1B / F1B'". To do. In addition, F2A (downlink signal) and F2A'(uplink signal) are collectively referred to as "F2A / F2A'", and F2B (downlink signal) and F2B'(uplink signal) are collectively referred to as "F2B / F2B'". Then, F2 (down signal) and F2'(up signal) are collectively referred to as "F2 / F2'".

The second radio relay station 20 is a radio signal of the second frequency (intermediate frequency) F2A / F2A', F2B / F2B', F2 / F2'to the first radio relay station 10 for each communication operator A and B. And the radio signals of F1A / F1A'and F1B / F1B', which are the first frequencies to be relayed between the mobile stations 40A and 40B (hereinafter, also referred to as "radio relay frequency" or "mobile station side frequency"). It is a frequency conversion type wireless relay device that relays.

The second radio relay station 20 is mounted on the drone 70 as an air vehicle that stays or moves in a predetermined airspace by autonomous control or external control. The drone 70 equipped with the second wireless relay station 20 is transported to a target position on the ground by an automobile (wireless relay vehicle) 50, and is controlled to stay above a predetermined altitude (for example, 100 to 150 m) from the ground. .. Power is supplied from the built-in battery to the flight drive unit of the drone 70 and the second radio relay station 20.

The automobile 50 may be provided with a takeoff and landing portion on which the drone 60 and the drone 70 can take off and land.

Hereinafter, a radio relay system using a drone 60 as an air vehicle equipped with the first radio relay station 10 and a drone 70 as an air vehicle equipped with the second radio relay station 20 is also referred to as a “drone radio relay system”.

The first frequency (relay target frequency) F1A / F1A', F1B / F1B'and the second frequency (intermediate frequency) F2A converted for each communication operator A and B in the first radio relay station 10 and the second radio relay station 20, respectively. In / F2A', F2B / F2B', and F2 / F2', wraparound interference between radio signals transmitted and received by the first radio relay station 10 and wraparound interference between radio signals transmitted and received by the second radio relay station 20 occur. The frequencies are different from each other so as not to. For example, the first frequency (relay target frequency) F1A / F1A', F1B / F1B'is a frequency in the 2.1 GHz band, and the second frequency (intermediate frequency) F2A / F2A', F2B / F2B', F2 / F2' May be a frequency in the 3.3 GHz band.

FIG. 3A is an explanatory diagram of problems of the wireless relay system according to the comparative example, and FIG. 3B is an explanatory diagram of the effect of the wireless relay system of the present embodiment.
In the wireless relay system according to the comparative example shown in FIG. 3A, the first wireless relay station 10 is mounted on the automobile 50, and is located near the distress site in order to secure communication with the user device (mobile station) of the victim. Generally, the first radio relay station (master unit) 10 is installed by moving the automobile 50, but the distress site is often a mountain or a forest. In such mountains and forests, there are few fixed base stations for each communication operator A and B, and when operating a wireless relay system in mountains and forests, the fixed bases are caused by obstacles S in the mountains and forests. The area between the stations 30A and 30B and the first wireless relay station (master unit) 10 tends to be out of sight. As a result, it is difficult to find the installation location of the master unit 10 which is the communication range area of the fixed base stations 30A and 30B near the distress site. In particular, when the radio waves of a plurality of communication operators A and B are relayed at the same time, the place where the master unit 10 is installed needs to be in all the communication range areas of the relaying communication operators A and B, but in mountains and forests. Since the installation locations of the fixed base stations are scattered, there are few locations that cover all the communication range areas of the relay communication operators A and B, and it becomes more difficult to find the installation location of the master unit 10. Further, the place where the automobile 50 can enter is often a place away from the distress site. As a result, it is often difficult to install the first wireless relay station (master unit) 10 near the distress site. Therefore, the location where the master unit 10 is installed is often far away from the vicinity of the distress site, and the distance between the master unit 10 and the target area including the true search site presumed to be the distress site becomes long. In addition, the obstacle S makes it impossible to see between the master unit 10 and the slave unit 20, and the relay distance between the master unit 10 and the slave unit 20 cannot be extended. As a result, it may not be possible to construct a communication area in the target area including the real search site that is presumed to be the distress site.

On the other hand, in the wireless relay system of the present embodiment, the first wireless relay station (master unit) 10 is mounted on the drone 60, lifted high in the sky, and flight-controlled so as to stay (hover) there. As a result, as shown in FIG. 3B, even when the first wireless relay station (master unit) 10 is installed near the disaster site in mountains or forests, the mountains or forests are obstacles to the relay wireless communication. Instead of becoming S, the line between the first wireless relay station (master unit) 10 and the fixed base stations 30A and 30B of each communication operator A and B is within the line-of-sight, and the first wireless relay station (master unit) 10 and It is also within the line of sight with the second wireless relay station (slave unit) 20. Therefore, according to the present embodiment, it is possible to reliably construct a communication range area capable of communicating with the user device in the target area including the real search site presumed to be the distress site.

Further, according to the present embodiment, even when the first wireless relay station (master unit) 10 is installed near the disaster site in a mountain or forest, the first wireless relay station (master unit) 10 and each communication operator A, Since the distance between the fixed base stations 30A and 30B of B is within the line-of-sight, the relay distance between the first wireless relay station (master unit) 10 and the fixed base stations 30A and 30B can be increased. Further, since the line between the first wireless relay station (master unit) 10 and the second wireless relay station (slave unit) 20 is within the line-of-sight, the first wireless relay station (master unit) 10 and the second wireless relay station (slave unit) ( The relay distance to and from the slave unit) 20 can also be increased. Therefore, even if the place where the automobile 50 can enter is a place away from the distress site and the first wireless relay station (master unit) 10 cannot be installed near the distress site, the real search site presumed to be the distress site can be found. It is possible to reliably construct a communication range area capable of communicating with the user device in the target area including the user device.

Further, according to the present embodiment, by mounting the first wireless relay station (master unit) 10 on the drone 60 and lifting it high in the sky, wireless relay is performed near the disaster site where the first wireless relay station (master unit) 10 is lifted. Since it is possible to significantly improve the probability that the plurality of communication operators A and B are all within the service area, it is possible to significantly reduce the time required to determine the installation location of the first wireless relay station (master unit) 10. As a result, the operating time of the drone wireless relay system can be significantly shortened, and the time spent for locating the victims who are competing for the moment can be significantly shortened.

Further, according to the present embodiment, the flight drive unit 60a such as a motor that drives the first wireless relay station (master unit) 10 and the propeller of the drone 60 from the battery or generator mounted on the automobile 50 via the cable 61. By supplying electric power to and, the first wireless relay station (master unit) 10 can stay in the sky for a long time, and the first wireless relay station (master unit) 10 which is the key to the drone wireless relay system It can be operated for a long time.

FIG. 4 is a block diagram showing an example of the main configuration of the first wireless relay station (master unit) and the second wireless relay station (slave unit) of the wireless relay system according to the embodiment.
In FIG. 4, the wireless relay system according to the present embodiment is a first wireless relay station (master unit) mounted on a drone 60 that stays in the sky at a position capable of communicating with existing mobile base stations (fixed base stations) 30A and 30B. It is composed of 10 and a second wireless relay station (slave unit) 20 mounted on the drone 70. As the wireless relay method, a "non-reproduction / frequency-modified repeat method" is used in which radio waves of mobile base stations 30A and 30B are received, frequency-converted and relayed.

The first radio relay station (master unit) 10 has directional first antennas (antennas for base stations) 101A and 101B for fixed base stations of each communication operator A and B, and a first antenna corresponding to communication operator A. It includes a master unit function unit 11A, a second master unit function unit 11B corresponding to the communication operator B, an addition / distribution unit 12, and a second antenna (antenna for anti-slave unit) 102 for a wireless relay station. .. The first master unit function unit 11A and the second master unit function unit 11B are each composed of a frequency converter, an amplifier (AMP), and the like.

The second wireless relay station (slave unit) 20 corresponds to the first antenna (antenna for the master unit) 201 for the wireless relay station, the first slave unit function unit 21A corresponding to the communication operator A, and the communication operator B. The second handset function unit 21B, the addition / distribution unit 22, and the second antenna 202 for mobile stations are provided. The first slave unit function unit 21A and the second slave unit function unit 21B are each composed of a frequency converter, an amplifier (AMP), and the like.

In addition, a changeover switch is provided instead of each of the addition / distribution units 12 and 22 in FIG. 4, and the first master unit function unit 11A and the second master unit function unit 11B of the master unit 10 can be switched, and the slave unit 20 can be switched. By synchronously executing the switching of the first slave unit function unit 21A and the second slave unit function unit 21B, the communication operators A and B may be configured to use the wireless relay in a time-division manner.

The master unit 10 relays radio signals of frequencies F1A and F1B received by the first antennas 101A and 10B for fixed base stations of a plurality of communication operators A and B on a downlink, for example, by a frequency converter different from F1. It is converted into a frequency (F2A, F2B) and transmitted from the second antenna 102 to the slave unit 20.

The slave unit 20 receives the radio waves transmitted by the frequency (F2A, F2B) from the master unit 10 by the first antenna 201, converts the frequency to (F1A, F1B) by the frequency converter, and directs the radio waves to the mobile stations 40A and 40B. Is output from the second antenna 202. The mobile station 40A of the communication operator A receives the frequency of F1A, and the mobile station 40B of the communication operator B receives the frequency of F1B.

By frequency conversion in each of the master unit 10 and the slave unit 20, wraparound interference of the same frequency between the first antennas 101A and 101B of the master unit 10 and the second antenna 102 and between the antennas 201 and 202 of the slave unit 20 occurs. Since the transmission power of the master unit 10 and the slave unit 20 can be transmitted at the maximum transmission power, the wireless relay distance and the wireless relay area can be increased.

Further, the wireless relay system of the present embodiment controls ON / OFF of wireless relay of each master unit 10 and slave unit 20 on the mobile communication networks (fixed networks) 80A and 80B of the communication operators A and B. The remote control devices 81A and 81B are provided for transmitting wireless relay ON / OFF control data to the master unit 10 and the slave unit 20 and remotely controlling the wireless relay of each of the master unit 10 and the slave unit 20 for ON / OFF control.

Further, in the wireless relay system of the present embodiment, the master unit 10 and the slave unit 20 are provided with wireless relay control devices 13 and 23 and wireless communication devices (portable communication modules) 14 and 24, respectively. The communication operators A and B are the wireless communication devices 14 and 24 and the wireless relay control device 13 in the master unit 10 and the slave unit 20 from the remote control devices 81A and 81B on the mobile communication network (fixed network) 80A and 80B. The wireless communication of each master unit 10 or slave unit 20 is ON / FF controlled via 23.

Further, the first wireless relay station (master unit) 10 has a DC transformer 62 that transforms a DC voltage supplied from a battery or a generator mounted on the automobile 50 via a cable 61. The electric power transformed by the DC transformer 62 is supplied to the first wireless relay station (master unit) 10. Further, power is supplied from the DC transformer 62 to the flight drive unit 60a of the drone 60 equipped with the first wireless relay station (master unit) 10, and the first wireless relay station (master unit) 10 stays above the automobile 50. The drone 60 is flight-driven to allow it to fly. In this way, by supplying electric power from the battery or generator mounted on the automobile 50 to the flight drive unit 60a of the first wireless relay station (master unit) 10 and the drone 60, the first wireless relay station 10 can be operated for a long time. You can let them stay in the sky.

Further, the second wireless relay station (slave unit) 20 has a battery 25, and power is supplied from the battery 25 to the second wireless relay station 20 and the flight drive unit 70a of the drone 70.

FIG. 5 is a block diagram showing another example of the main component configuration of the first wireless relay station (master unit) 10 and the second wireless relay station (slave unit) 20 of the wireless relay system according to the embodiment.
In the wireless relay system shown in FIG. 5, the first antenna 101 for the fixed base stations 30A and 30B of the first wireless relay station (master unit) 10 is used as one horizontal omnidirectional antenna. By using one antenna 101 as an omnidirectional antenna in the horizontal plane, the antenna configuration can be simplified as compared with the configuration of FIG. 4 in which the directional antennas are provided for each of the communication operators A and B. it can. Further, the weight of the first wireless relay station (master unit) 10 can be reduced as compared with the configuration of FIG. 4 in which the first antenna is provided for each of the communication operators A and B. In addition, although the gain is low by using an omnidirectional antenna, the first radio relay station (master unit) 10 is raised to the sky by an air vehicle such as a drone 60 to perform line-of-sight communication with the fixed base stations 30A and 30B. Therefore, there is almost no power loss of radio waves. Therefore, even if the gain is low, good communication can be performed with the fixed base stations 30A and 30B.

Further, in the configuration of FIG. 4 in which the first directional antenna is provided for each of the communication operators A and B, each of the first antennas is based on the directions of the fixed base stations 30A and 30B at the installation site of the first radio relay station. It is necessary to adjust the attitude of the first radio relay station 10 and to accurately control the attitude of the drone 60 so that the first antennas 101A and 101B face the corresponding fixed base stations 30A and 30B. .. However, by using an omnidirectional antenna as the first antenna, the attitude adjustment of the antenna becomes unnecessary, and the highly accurate attitude control of the drone 60 becomes unnecessary.

6 and 7 are block diagrams showing still other examples of the main configuration of the first wireless relay station (master unit) and the second wireless relay station (slave unit) of the wireless relay system according to the embodiment, respectively. .. FIG. 6 shows an example in which the first directional antennas 101A and 101B are provided so as to correspond to the fixed base stations 30A and 30B, and FIG. 7 shows an example in which the first wireless relay station (master unit) 10 is used. FIG. This is an example in which the first wireless relay station (master unit) 10 provided with the first antenna of sex is used.

In the wireless relay systems shown in FIGS. 6 and 7, a battery 63 is mounted on the first wireless relay station (master unit) 10, and the first wireless relay station 10 and the first wireless relay station are powered by the electric power stored in the battery 63, respectively. The drone 60 equipped with the 10 is configured to be driven in flight. By mounting the battery 63 on the first wireless relay station (master unit) 10, the operating time of the first wireless relay station (master unit) 10 is shortened, but vehicles such as automobiles (wireless relay vehicles) cannot enter. The first radio relay station 10 can be allowed to stay in the sky above such a site, and the first radio relay station 10 can be installed closer to the disaster site.

The processing process described in the present specification and the components of the radio relay station, the remote control device, the remote control device, and the base station device in the base station can be implemented by various means. For example, these steps and components may be implemented in hardware, firmware, software, or a combination thereof.

For hardware implementation, the entity (for example, wireless relay station, base station device, wireless relay device, user device (mobile station, communication terminal), remote control device, remote control device, hard disk drive device, or optical disk drive device) The means such as a processing unit used to realize the above steps and components are one or more application-specific ICs (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), and programmable. Logic devices (PLDs), field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, electronic devices, and others designed to perform the functions described herein. It may be implemented in an electronic unit, a computer, or a combination thereof.

For firmware and / or software implementation, means such as processing units used to implement the above components are programs (eg, procedures, functions, modules, instructions) that perform the functions described herein. , Etc.) may be implemented. Generally, any computer / processor readable medium that clearly embodies the firmware and / or software code is a means such as a processing unit used to implement the steps and components described herein. May be used to implement. For example, the firmware and / or software code may be stored in memory and executed by a computer or processor, for example, in a control device. The memory may be implemented inside the computer or processor, or may be implemented outside the processor. Further, the firmware and / or software code includes, for example, a random access memory (RAM), a read-only memory (ROM), a non-volatile random access memory (NVRAM), a programmable read-only memory (PROM), and an electrically erasable PROM (EEPROM). ), FLASH memory, floppy (registered trademark) discs, compact discs (CDs), digital versatile discs (DVDs), magnetic or optical data storage devices, etc. Good. The code may be executed by one or more computers or processors, or the computers or processors may be made to perform functional embodiments described herein.

Further, the medium may be a non-temporary recording medium. Further, the code of the program may be read and executed by a computer, a processor, or another device or device machine, and the format thereof is not limited to a specific format. For example, the code of the program may be any of source code, object code, and binary code, or may be a mixture of two or more of these codes.

Also, the description of the embodiments disclosed herein is provided to allow one of ordinary skill in the art to manufacture or use the disclosure. Various amendments to this disclosure will be readily apparent to those of skill in the art and the general principles defined herein are applicable to other variations without departing from the spirit or scope of this disclosure. Therefore, this disclosure is not limited to the examples and designs described herein, but should be accepted in the broadest range consistent with the principles and novel features disclosed herein.

10: 1st wireless relay station (master unit)
11A: First master unit function unit (communication operator A)
11B: Second master unit function unit (communication operator B)
12: Addition / distribution unit 13: Wireless relay control device 14: Wireless communication device 20: Second wireless relay station (slave unit)
21A: First slave unit function unit (communication operator A)
21B: 2nd slave unit function unit (communication operator B)
22: Addition / distribution unit 23: Wireless relay control device 24: Wireless communication device 25: Battery 30A, 30B: Fixed base station (mobile base station)
31A, 31B: Antenna 40A, 40B: Mobile station 50: Automobile 60: Aircraft (drone)
60a: Flight drive 61: Cable 62: DC transformer 63: Battery 70: Flying object (drone)
70a: Flight drive unit 101,101A, 101B: First antenna (antenna for base station)
102: Second antenna (antenna for anti-slave unit)
200A, 200B: Cell 201: 1st antenna (antenna for master unit)
202: Second antenna (antenna for terminals)

Claims (3)

A wireless relay system that relays wireless communication between a fixed base station of a mobile communication network and a user device.
A first wireless relay station mounted on a floating body capable of staying in an aerial area capable of wireless communication with the fixed base station, and
A second wireless relay station mounted on an air vehicle that can be controlled to stay in an aerial area capable of wireless communication with the first wireless relay station and relaying wireless communication between the first wireless relay station and a user device. A wireless relay system characterized by being equipped with. In the wireless relay system according to claim 1,
A wireless relay system characterized in that the antenna for communicating with the fixed base station of the first wireless relay station is an omnidirectional antenna. In the wireless relay system according to claim 1 or 2.
A wireless relay system characterized by supplying electric power to the first wireless relay station mounted on the floating body and from the ground.

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