JP6935891B2 - Wireless relay system - Google Patents

Description

The present invention relates to communication technology, and more particularly to a wireless relay system for transferring data.

In a wireless communication system, a base station device and a terminal device communicate with each other. Communication between the base station device and the terminal device may not be possible or communication may be difficult due to a large-scale disaster or the like. In such a case, in order to enable communication between the base station device and the terminal device without the engineer going to the site, the moving body is within the range that can communicate with the base station device and the terminal device. It moves and the mobile body relays the communication between the base station device and the terminal device (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2016-21987

When an unmanned mobile body such as a drone is equipped with a communication function and an imaging function, it is possible to receive an image captured at the moved position while instructing the moving body to move via wireless communication. As a result, for example, when a moving body is flown to a disaster occurrence site at the time of a disaster, it is possible to check an image of the disaster occurrence site without a person moving to the disaster occurrence site. In such a process, the wireless communication transmits a control signal used for control such as instructing the moving body to move and data including the captured image. A long transmission distance is required for the control signal in order to widen the moving range of the moving body, and a high transmission rate is required for the data in order to improve the quality of the image.

The present invention has been made in view of such a situation, and an object of the present invention is to provide a technique for achieving both a long transmission distance and a high-speed transmission rate.

In order to solve the above problems, the wireless relay system according to an embodiment of the present invention includes a control device capable of communicating between the first wireless communication network and the second wireless communication network, and a first wireless communication network and a second wireless communication network. It is provided with a data transmission mobile body that is communicable and mobile, and a data relay mobile body that is communicable and movable between the first wireless communication network and the second wireless communication network. The data transmission source mobile body transmits data to the data relay mobile body by the second wireless communication network at a position moved according to the first control signal received from the control device by the first wireless communication network, and data relays. The mobile body receives data from the data transmission source mobile body by the second wireless communication network at a position moved according to the second control signal received from the control device by the first wireless communication network, and also receives the data from the second wireless communication network. Data is transmitted to the control device by the wireless communication network, and the control device receives the data from the data relay mobile body by the second wireless communication network.

It should be noted that any combination of the above components and the conversion of the expression of the present invention between methods, devices, systems, recording media, computer programs and the like are also effective as aspects of the present invention.

According to the present invention, both a long transmission distance and a high-speed transmission rate can be achieved at the same time.

It is a figure which shows the structure of the wireless relay system which concerns on Example 1. FIG. It is a sequence diagram which shows the relay procedure by the wireless relay system of FIG. It is a figure which shows the structure of the wireless relay system which concerns on Example 2. FIG. It is a sequence diagram which shows the relay procedure by the wireless relay system of FIG. It is a figure which shows the structure of the wireless relay system which concerns on Example 3. FIG. It is a sequence diagram which shows the relay procedure by the wireless relay system of FIG. It is a figure which shows the structure of the wireless relay system which concerns on Example 4. FIG.

(Example 1)
Before concretely explaining the present invention, an outline will be described. The first embodiment relates to a wireless relay system that performs wireless communication with an unmanned mobile body such as a drone. As described above, the moving body has a communication function and an imaging function, moves according to an instruction included in a control signal received via wireless communication, and acquires data including an image captured at the moved position. Send. Since the working range of such a moving body is limited to the transmission distance of the control signal, a long transmission distance is required for the control signal. On the other hand, since the quality of video is limited to the band of data, high-speed transmission rate is required for data. One of the wireless communication systems having a long transmission distance and a high transmission rate is LTE (Long Term Evolution). However, in general, as the transmission distance becomes longer, the transmission rate becomes slower, so that it may be difficult to achieve both a long transmission distance and a high-speed transmission rate at the same time.

In this embodiment, in order to achieve both of these, a mobile communication system such as LTE (hereinafter referred to as "first wireless communication system" or "first wireless communication network") is used for transmission of control signals. Since the transmission rate required for transmission of the control signal may generally be slow, a first wireless communication network is used to increase the transmission distance. On the other hand, in this embodiment, a wireless LAN (Local Area Network) (hereinafter referred to as "second wireless communication system" or "second wireless communication network") is used for data transmission. However, the transmission distance of the second wireless communication network is short as the transmission distance of the first wireless communication network. Therefore, the data is not transmitted. Therefore, in this embodiment, in addition to the mobile body for capturing an image (hereinafter, referred to as "data transmission source mobile body"), the mobile body for relaying data from the data transmission source mobile body (hereinafter, "data transmission source mobile body"). , "Mobile for data relay") is also used. That is, the transmission of the control signal by the first wireless communication network having a long transmission distance and the relay of data by the second wireless communication network having a high transmission rate but a short transmission distance are executed.

FIG. 1 shows the configuration of the wireless relay system 100. The wireless relay system 100 includes a control device 10, a first network 12, a first base station device 14, a second network 16, a second base station device 18, a data transmission source mobile body 20, and a data relay mobile body 22. .. The wireless relay system 100 executes, for example, a task of moving a data transmission source mobile body 20 to a disaster occurrence site, capturing an image at the disaster occurrence site, and transmitting the captured image.

The control device 10 is a computer corresponding to a cloud server. The control device 10 may be composed of one computer or a combination of a plurality of computers. The control device 10 receives a mission instruction from the user, causes the data transmission source mobile body 20 to execute the mission, and receives an image from the data transmission source mobile body 20. Details of these processes will be described later.

The first network 12 connects the control device 10 and the first base station device 14. The first base station device 14 is included in a first wireless communication network such as LTE. On the other hand, the second network 16 connects the control device 10 and the second base station device 18. The second base station device 18 is included in a second wireless communication network such as a wireless LAN. The second wireless communication network has a shorter transmission distance and a higher transmission rate as compared with the first wireless communication network. With such a configuration, the control device 10 can communicate with the first wireless communication network and the second wireless communication network. Here, for the sake of clarity, the first network 12 connected to the first base station apparatus 14 and the second network 16 connected to the second base station apparatus 18 are shown separately. May be standardized.

The data transmission source mobile body 20 and the data relay mobile body 22 are, for example, unmanned aerial vehicles such as drones, and can move like a flight. The data transmission source mobile body 20 and the data relay mobile body 22 are driven by the electric power stored in the battery. Further, the data transmission source mobile body 20 and the data relay mobile body 22 can communicate with each other via the first wireless communication network and the second wireless communication network. The data transmission source mobile body 20 and the data relay mobile body 22 have the same configuration, but here, different functions according to different roles will be described.

In the following, based on such a configuration, for the mission of moving the data transmission source mobile body 20 to the disaster occurrence site, capturing an image at the disaster occurrence site, and transmitting the captured image. The processing will be described in the order of (1) movement processing and (2) relay processing.

(1) Movement processing The operation unit 30 of the control device 10 is an interface capable of receiving instructions from the user. The operation unit 30 corresponds to, for example, a keyboard, a mouse, a touch panel, or the like. The operation unit 30 receives instructions regarding the mission (hereinafter referred to as "mission instructions") from the user. The mission instruction is, for example, the location information of the disaster occurrence site. Here, the content of the mission is to move the data transmission source mobile body 20 to the disaster occurrence site, image the image at the disaster occurrence site, and transmit the captured image. If so, the content is included in the mission instruction. The operation unit 30 outputs a mission instruction to the processing unit 32.

The processing unit 32 receives a mission instruction from the operation unit 30. The processing unit 32 extracts the location information of the disaster occurrence site included in the mission instruction, and the first control including the instruction to move to the location information of the disaster occurrence site (hereinafter, referred to as “first movement instruction”). Generate a signal. The destination of the first control signal is the data transmission source mobile body 20. The processing unit 32 outputs the first control signal to the first communication unit 34. The first communication unit 34 transmits the first control signal to the data transmission source mobile body 20 via the first network 12 and the first base station device 14. Here, it is assumed that the disaster occurrence site is included in the communication area (hereinafter, referred to as “first communication area”) capable of communicating with the first base station apparatus 14. A plurality of first base station devices 14 may be arranged, and a handover may be performed across the plurality of first base station devices 14 between the current position of the data transmission source mobile body 20 and the disaster occurrence site.

The processing unit 32 stores the position information of the second base station device 18, and calculates the distance between the second base station device 18 and the disaster occurrence site. When the distance between the second base station device 18 and the disaster occurrence site is longer than the distance between the communication area end of the second base station device 18 and the second base station device 18. , Determines the use of the data relay mobile body 22. This corresponds to the fact that the disaster occurrence site is not included in the communication area (hereinafter, referred to as “second communication area”) capable of communicating with the second base station device 18.

The processing unit 32 identifies a position (hereinafter, referred to as “relay position”) capable of ad hoc communication with the data transmission source mobile body 20 existing at the disaster occurrence site even though the position is included in the second communication area. do. For example, the processing unit 32 specifies an intermediate point between the position of the second base station device 18 and the disaster occurrence site as a relay position. The processing unit 32 holds the map information, and when an obstacle such as a skyscraper is arranged at the specified relay position, the relay position may be corrected in the second communication area. The processing unit 32 generates a second control signal including an instruction to move to the relay position (hereinafter, referred to as “second movement instruction”). The destination of the second control signal is the data relay mobile body 22. The processing unit 32 outputs the second control signal to the first communication unit 34. The first communication unit 34 transmits a second control signal to the data relay mobile body 22 via the first network 12 and the first base station device 14. Here, too, the relay position is included in the first communication area.

The first communication unit 40 of the data transmission source mobile body 20 can execute communication on the first wireless communication network, and receives the first control signal from the first base station device 14. The first communication unit 40 outputs the first control signal to the processing unit 42. The processing unit 42 extracts the first movement instruction from the first control signal and specifies the position information of the disaster occurrence site based on the first movement instruction. Further, the positioning unit 44 is provided with a GPS (Global Positioning System) receiver, and positions the current position of the data transmission source mobile body 20 by receiving a signal from a GPS satellite (not shown). Since a known technique may be used for positioning in the positioning unit 44, description thereof will be omitted here. The positioning unit 44 outputs the current position measured periodically to the processing unit 42.

The processing unit 42 controls the operation of the drive unit 46 so that the current position received from the positioning unit 44 approaches the position information of the disaster occurrence site. The drive unit 46 includes, for example, a motor connected to a propeller and also has a steering function, and operates under the control of the processing unit 42. By the operation of the drive unit 46, the data transmission source mobile body 20 moves toward the disaster occurrence site. When the current position approaches within a certain range from the position information of the disaster occurrence site, the processing unit 42 determines that the data transmission source mobile body 20 has arrived at the disaster occurrence site. When the processing unit 42 determines the arrival, the processing unit 42 generates a first response signal including the arrival report. The destination of the first response signal is the control device 10.

The processing unit 42 outputs the first response signal to the first communication unit 40. The first communication unit 40 transmits a first response signal to the control device 10 via the first base station device 14 and the first network 12. The first communication unit 34 of the control device 10 receives the first response signal from the data transmission source mobile body 20 and outputs the first response signal to the processing unit 32. When the processing unit 32 receives the first response signal from the first communication unit 34, the processing unit 32 confirms the arrival report included in the first response signal, and the data transmission source mobile body 20 has arrived at the disaster occurrence site. Recognize.

The first communication unit 60, the processing unit 62, the positioning unit 64, and the driving unit 66 of the data relay mobile body 22 are the first communication unit 40, the processing unit 42, the positioning unit 44, and the driving unit of the data transmission source mobile body 20. The same process as in 46 is executed. The first communication unit 60 of the data relay mobile body 22 receives the second control signal from the first base station device 14. The first communication unit 60 outputs the second control signal to the processing unit 62. The processing unit 62 extracts the second movement instruction from the second control signal and specifies the relay position based on the second movement instruction. The processing unit 62 controls the operation of the drive unit 66 so that the current position received from the positioning unit 64 approaches the relay position. By the operation of the drive unit 66, the data relay moving body 22 moves toward the relay position.

The processing unit 62 determines that the data relay moving body 22 has arrived at the relay position when the current position approaches within a certain range from the relay position. When the processing unit 62 determines the arrival, it generates a second response signal including the arrival report. The destination of the second response signal is the control device 10. The processing unit 62 outputs the second response signal to the first communication unit 60. The first communication unit 60 transmits a second response signal to the control device 10 via the first base station device 14 and the first network 12. The first communication unit 34 of the control device 10 receives the second response signal from the data relay mobile body 22 and outputs the second response signal to the processing unit 32. When the processing unit 32 receives the second response signal from the first communication unit 34, it confirms the arrival report included in the second response signal and recognizes that the data relay moving body 22 has arrived at the relay position. do.

(2) Relay processing The processing unit 32 of the control device 10 includes an instruction for imaging and an instruction for transmitting the captured image (hereinafter, referred to as “transmission instruction”) to the data transmission source mobile body 20. 1 Generate a control signal. The imaging instruction may include position information of an object to be imaged, and the imaging instruction and transmission instruction may include information about a period during which imaging and transmission should be performed. The destination of the first control signal is the data transmission source mobile body 20. The processing unit 32 outputs the first control signal to the first communication unit 34. The first communication unit 34 transmits the first control signal to the data transmission source mobile body 20 via the first network 12 and the first base station device 14.

The processing unit 32 of the control device 10 gives the data relay mobile body 22 a second control signal including an instruction to relay the video from the data transmission source mobile body 20 (hereinafter, referred to as “relay instruction”). To generate. The relay instruction may include information about how long the relay should be performed. The destination of the second control signal is the data relay mobile body 22. The processing unit 32 outputs the second control signal to the first communication unit 34. The first communication unit 34 transmits a second control signal to the data relay mobile body 22 via the first network 12 and the first base station device 14.

The first communication unit 40 of the data transmission source mobile body 20 receives the first control signal from the first base station device 14. The first communication unit 40 outputs the first control signal to the processing unit 42. The processing unit 42 extracts an imaging instruction and a transmission instruction from the first control signal. The processing unit 42 causes the imaging unit 50 to capture an image according to the imaging instruction. When the imaging instruction includes the position information of the target to be imaged, the processing unit 42 causes the imaging unit 50 to image the target of the position information. The imaging unit 50 is, for example, a camera, which captures an image and outputs the image to the processing unit 42. When the processing unit 42 receives the image from the imaging unit 50, the processing unit 42 generates data including the image. The processing unit 42 causes the second communication unit 48 to transmit the data according to the transmission instruction.

The second communication unit 48 corresponds to the second wireless communication network, and can execute ad hoc communication with the second communication unit 68 of the data relay mobile body 22. Since a known technique may be used for ad hoc communication, the description thereof will be omitted here. The second communication unit 48 transmits the data received from the processing unit 42 to the second communication unit 68. That is, the data transmission source mobile body 20 transfers data to the data relay mobile body 22 by the second wireless communication network at the position where the data transmission source mobile body 20 moves according to the first control signal received from the control device 10 by the first wireless communication network. Send.

The first communication unit 60 of the data relay mobile body 22 receives the second control signal from the first base station device 14. The first communication unit 60 outputs the second control signal to the processing unit 62. The processing unit 62 extracts the relay instruction from the second control signal and relays the data to the second communication unit 68 according to the relay instruction. The second communication unit 68 corresponds to the second wireless communication network, and can execute ad hoc communication with the second communication unit 48 of the data transmission source mobile body 20. The second communication unit 68 receives data from the second communication unit 48 of the data transmission source mobile body 20 and transmits the data to the second base station device 18. That is, the data relay mobile body 22 moves from the data transmission source mobile body 20 by the second wireless communication network at the position where the data relay mobile body 22 moves according to the second control signal received from the control device 10 by the first wireless communication network. Is transferred to the control device 10.

The second communication unit 36 of the control device 10 receives data from the data relay mobile body 22 via the second base station device 18 and the second network 16. The second communication unit 36 outputs data to the processing unit 32. The processing unit 32 extracts an image from the received data. The processing unit 32 may reproduce the video.

In terms of hardware, this configuration can be realized by the CPU, memory, or other LSI of any computer, and in terms of software, it can be realized by a program with a communication function loaded in the memory. It depicts a functional block realized by the cooperation of. Therefore, it will be understood by those skilled in the art that these functional blocks can be realized in various ways by hardware only, software only, or a combination thereof.

The operation of the wireless relay system 100 with the above configuration will be described. FIG. 2 is a sequence diagram showing a relay procedure by the wireless relay system 100. The control device 10 transmits the first control signal to the data transmission source mobile body 20 (S10). The data transmission source mobile body 20 moves to the disaster occurrence site (S12) and arrives at the disaster occurrence site (S14). The control device 10 transmits the second control signal to the data relay mobile body 22 (S16). The data relay moving body 22 moves to the relay position (S18) and arrives at the relay position (S20).

The data transmission source mobile body 20 transmits the first response signal to the control device 10 (S22), and the data relay mobile body 22 transmits the second response signal to the control device 10 (S24). The control device 10 transmits the first control signal to the data transmission source mobile body 20 (S26), and transmits the second control signal to the data relay mobile body 22 (S28). The data transmission source mobile body 20 captures an image (S30), the data transmission source mobile body 20 transmits data to the data relay mobile body 22 (S32), and the data relay mobile body 22 controls the data. It is transmitted to the device 10 (S34). The control device 10 acquires data (S36).

According to this embodiment, since the control signal and the response signal are transmitted using the first wireless communication network, the transmission distance between the control signal and the response signal can be lengthened. Further, since the transmission distance between the control signal and the response signal becomes long, it is possible to stably control the data transmission source moving body and the data relay moving body. Further, since the data from the data transmission source mobile body is relayed to the data relay mobile body by using the second wireless communication network, the transmission distance can be lengthened even when the second wireless communication network is used. .. Further, since the data from the data transmission source mobile body is relayed to the data relay mobile body by using the second wireless communication network, the transmission rate can be increased. Further, since the first wireless communication network and the second wireless communication network are used in combination, a long transmission distance and a high-speed transmission rate can be achieved at the same time.

(Example 2)
Next, Example 2 will be described. The second embodiment relates to a wireless relay system that executes wireless communication with a mobile body as in the first embodiment. Further, also in the second embodiment, control is performed by transmitting a control signal from the control device to the data transmission source mobile body and the data relay mobile body, and relaying the data from the data transmission source mobile body in the data relay mobile body. The device receives. Further, a first wireless communication network is used for transmission of control signals, and a second wireless communication network is used for data relay. The second embodiment aims to further increase the transmission rate in the second wireless communication network. Therefore, in the second embodiment, a plurality of antennas are provided for each of the second base station apparatus, the mobile body for data transmission, and the mobile body for data relay, and adaptive array, beamforming, and MIMO (Multiple Input Multiple Output) are executed. Will be done. In the following, the differences from the past will be mainly explained.

FIG. 3 shows the configuration of the wireless relay system 100. Similar to FIG. 1, the wireless relay system 100 includes a control device 10, a first network 12, a first base station device 14, a second network 16, a second base station device 18, a data transmission source mobile body 20, and data relay. The moving body 22 is included. The control device 10, the data transmission source mobile body 20, and the data relay mobile body 22 have the same configurations as those in FIG. On the other hand, the second base station device 18 is provided with a plurality of antennas, the data transmission source mobile body 20 is provided with a plurality of antennas for the second wireless communication network, and the data relay mobile body 22 is of the second wireless communication network. It is equipped with multiple antennas for this purpose. Here, the differences from the past will be mainly described.

In the first embodiment, (1) movement processing and (2) relay processing were executed in order, but in the second embodiment, (1) movement processing, (1') preparation processing, and (2) relay processing are executed in order. Will be done. That is, in the second embodiment, the (1') preparatory process is added as compared with the first embodiment. (1) Since the movement process is the same as that of the first embodiment, the description thereof will be omitted here.

(1') Preparatory processing The processing unit 32 of the control device 10 includes an instruction (hereinafter, referred to as “transmission instruction”) for transmitting a training signal for estimating a transmission path to the data transmission source mobile body 20. The first control signal is generated. The destination of the first control signal is the data transmission source mobile body 20. The processing unit 32 outputs the first control signal to the first communication unit 34. The first communication unit 34 transmits the first control signal to the data transmission source mobile body 20 via the first network 12 and the first base station device 14.

The processing unit 32 of the control device 10 generates a transmission line estimation instruction (hereinafter, referred to as “estimation instruction”) and a second control signal including a transmission instruction to the data relay mobile body 22. The destination of the second control signal is the data relay mobile body 22. The processing unit 32 outputs the second control signal to the first communication unit 34. The first communication unit 34 transmits a second control signal to the data relay mobile body 22 via the first network 12 and the first base station device 14.

The first communication unit 40 of the data transmission source mobile body 20 receives the first control signal from the first base station device 14. The first communication unit 40 outputs the first control signal to the processing unit 42. The processing unit 42 extracts a transmission instruction from the first control signal. The processing unit 42 causes the second communication unit 48 to transmit the training signal according to the transmission instruction. The second communication unit 48 transmits training signals from each of the plurality of antennas to the data relay mobile body 22. The training signal is a signal known to the data relay mobile body 22.

The first communication unit 60 of the data relay mobile body 22 receives the second control signal from the first base station device 14. The first communication unit 60 outputs the second control signal to the processing unit 62. The processing unit 62 extracts the estimation instruction and the transmission instruction from the second control signal, and causes the second communication unit 68 to receive the training signal from the data transmission source mobile body 20 according to the estimation instruction. The second communication unit 68 receives the training signal from the data transmission source mobile body 20 at each of the plurality of antennas, and estimates the transmission line characteristics. Since a known technique may be used for estimating the transmission line characteristics, the description thereof will be omitted here. The second communication unit 68 outputs the estimated transmission line characteristics to the processing unit 62. The processing unit 62 generates a second response signal including the transmission line characteristics received from the second communication unit 68. The processing unit 62 outputs the second response signal to the first communication unit 60. The first communication unit 60 transmits a second response signal to the control device 10 via the first base station device 14 and the first network 12.

Further, the processing unit 62 causes the second communication unit 68 to transmit the training signal according to the transmission instruction. The second communication unit 68 transmits a training signal from each of the plurality of antennas to the second base station device 18. The training signal is a signal known to the second base station apparatus 18. The second base station device 18 receives the training signal from the data relay mobile body 22 at each of the plurality of antennas, and estimates the transmission line characteristics. The second base station device 18 transmits the transmission line characteristics to the control device 10 via the second network 16.

The first communication unit 34 of the control device 10 receives the second response signal from the data relay mobile body 22 and outputs the second response signal to the processing unit 32. When the processing unit 32 receives the second response signal from the first communication unit 34, the processing unit 32 extracts the transmission line characteristics included in the second response signal. This shows the characteristics of the transmission line from the data transmission source mobile body 20 to the data relay mobile body 22. The processing unit 32 derives at least one of the transmission weights for the plurality of antennas of the data transmission source mobile body 20 and the reception weights for the plurality of antennas of the data relay mobile body 22 based on the transmission line characteristics. The transmission weight and the reception weight are collectively referred to as "weight". Such weights are used to perform adaptive arrays, beamforming, MIMO, and known techniques are used to derive the weights. The number of antennas of the data transmission source mobile body 20 and the number of antennas of the data relay mobile body 22 are managed in advance by the processing unit 32. When the transmission weight is derived, the processing unit 32 generates a first control signal including the transmission weight, and causes the first communication unit 34 to transmit the first control signal to the data transmission source mobile body 20. When the reception weight is derived, the processing unit 32 generates a second control signal including the reception weight, and causes the first communication unit 34 to transmit the second control signal to the data relay mobile body 22.

The second communication unit 36 of the control device 10 receives the transmission line characteristics from the second base station device 18 and outputs the transmission line characteristics to the processing unit 32. The processing unit 32 receives the transmission line characteristics from the second communication unit 36. This shows the characteristics of the transmission line from the data relay mobile body 22 to the second base station device 18. The processing unit 32 derives at least one of the transmission weights for the plurality of antennas of the data relay mobile body 22 and the reception weights for the plurality of antennas of the second base station device 18 based on the transmission line characteristics. The transmission weight and the reception weight are collectively referred to as "weight" as described above. The number of antennas of the second base station device 18 is managed in advance by the processing unit 32. When the transmission weight is derived, the processing unit 32 generates a second control signal including the transmission weight, and causes the first communication unit 34 to transmit the second control signal to the data relay mobile body 22. When the receiving weight is derived, the processing unit 32 causes the second communication unit 36 to transmit the receiving weight to the second base station device 18. That is, the control device 10 determines the weight, which is the content of the process when the plurality of antennas provided in the data relay mobile body 22 are used for communication by the second wireless communication network. Further, the control device 10 transmits a second control signal including the determined weight to the data relay mobile body 22 by the first wireless communication network.

When the transmission weight is derived, the first communication unit 40 of the data transmission source mobile body 20 receives the first control signal from the first base station device 14. The first communication unit 40 outputs the first control signal to the processing unit 42. The processing unit 42 extracts the transmission weight from the first control signal. Further, the first communication unit 60 of the data relay mobile body 22 receives the second control signal from the first base station device 14. The first communication unit 60 outputs the second control signal to the processing unit 62. The processing unit 62 extracts at least one of the receiving weight and the transmitting weight from the second control signal. Further, the second base station device 18 receives the reception weight from the control device 10 via the second network 16.

(2) Relay processing As in the past, the processing unit 32 of the control device 10 generates a first control signal including an imaging instruction and a transmission instruction for the data transmission source mobile body 20. The first communication unit 34 transmits the first control signal to the data transmission source mobile body 20 via the first network 12 and the first base station device 14. The processing unit 32 of the control device 10 generates a second control signal including a relay instruction for the data relay mobile body 22. The first communication unit 34 transmits a second control signal to the data relay mobile body 22 via the first network 12 and the first base station device 14.

The first communication unit 40 of the data transmission source mobile body 20 receives the first control signal from the first base station device 14. The first communication unit 40 outputs the first control signal to the processing unit 42. The processing unit 42 extracts an imaging instruction and a transmission instruction from the first control signal. The processing unit 42 causes the imaging unit 50 to image an image according to the instruction of imaging, and when the image is received from the imaging unit 50, the processing unit 42 generates data including the image. At that time, if the processing unit 42 receives the transmission weight, the processing unit 42 weights the data by the transmission weight. This is equivalent to performing beamforming or MIMO. The processing unit 42 causes the second communication unit 48 to transmit the data according to the transmission instruction. At that time, the data is transmitted from a plurality of antennas.

The first communication unit 60 of the data relay mobile body 22 receives the second control signal from the first base station device 14. The first communication unit 60 outputs the second control signal to the processing unit 62. The processing unit 62 extracts the relay instruction from the second control signal and relays the data to the second communication unit 68 according to the relay instruction. The second communication unit 68 receives the data from the second communication unit 48 of the data transmission source mobile body 20 with the plurality of antennas, and outputs the received data to the processing unit 62. At that time, if the receiving weight is received, the processing unit 62 weights the data according to the receiving weight. This is equivalent to running an adaptive array or MIMO. If the processing unit 62 receives the transmission weight, the processing unit 62 weights the data according to the transmission weight. This is equivalent to performing beamforming or MIMO. The processing unit 62 causes the second communication unit 68 to transmit the data. At that time, the data is transmitted from a plurality of antennas.

The second base station device 18 receives data from the second communication unit 68 of the data relay mobile body 22 by a plurality of antennas. If the second base station device 18 receives the reception weight, the second base station device 18 weights the data according to the reception weight. This is equivalent to running an adaptive array or MIMO. The second communication unit 36 of the control device 10 receives the data from the second base station device 18. The second communication unit 36 outputs data to the processing unit 32. The processing unit 32 extracts an image from the received data. The processing unit 32 may reproduce the video.

The operation of the wireless relay system 100 with the above configuration will be described. FIG. 4 is a sequence diagram showing a relay procedure by the wireless relay system 100. The control device 10 transmits the first control signal to the data transmission source mobile body 20 (S50). The data transmission source mobile body 20 moves to the disaster occurrence site (S52) and arrives at the disaster occurrence site (S54). The control device 10 transmits the second control signal to the data relay mobile body 22 (S56). The data relay moving body 22 moves to the relay position (S58) and arrives at the relay position (S60).

The data transmission source mobile body 20 transmits the first response signal to the control device 10 (S62), and the data relay mobile body 22 transmits the second response signal to the control device 10 (S64). The control device 10 transmits the first control signal to the data transmission source mobile body 20 (S66), and transmits the second control signal to the data relay mobile body 22 (S68). The data relay mobile unit 22 estimates the transmission line characteristics (S72). The data relay mobile body 22 transmits the second response signal to the control device 10 (S76). The control device 10 derives the weight (S78). The control device 10 transmits the first control signal to the data transmission source mobile body 20 (S80), and transmits the second control signal to the data relay mobile body 22 (S82). The data transmission source mobile body 20 captures an image (S84), the data transmission source mobile body 20 transmits data to the data relay mobile body 22 (S86), and the data relay mobile body 22 controls the data. It is transmitted to the device 10 (S88). The control device 10 acquires data (S90).

According to this embodiment, since a plurality of antennas are used for communication by the second wireless communication network, the transmission rate can be further increased. Further, since the weight when a plurality of antennas are used is derived in the control device, it is possible to suppress an increase in the processing amount of the data transmission source mobile body and the data relay mobile body. Further, since the increase in the processing amount of the data transmission source mobile body and the data relay mobile body is suppressed, the drive time of the data transmission source mobile body and the data relay mobile body can be lengthened by the battery.

(Example 3)
Next, Example 3 will be described. The third embodiment relates to a wireless relay system that executes wireless communication with a mobile body as before. Further, also in the third embodiment, control is performed by transmitting a control signal from the control device to the data transmission source mobile body and the data relay mobile body, and relaying the data from the data transmission source mobile body in the data relay mobile body. The device receives. Further, a first wireless communication network is used for transmission of control signals, and a second wireless communication network is used for data relay. The third embodiment also aims to further increase the transmission rate in the second wireless communication network. Therefore, in the third embodiment, a plurality of data relay mobiles are used as the data relay mobiles, and cooperative transmission is executed by these. In the following, the differences from the past will be mainly explained.

FIG. 5 shows the configuration of the wireless relay system 100. The wireless relay system 100 is collectively referred to as a control device 10, a first network 12, a first base station device 14, a second network 16, a second base station device 18, a data transmission source mobile body 20, and a data relay mobile body 22. The first data relay moving body 22a and the second data relay moving body 22b are included. The number of mobile bodies 22 for data relay may be "3 or more". The control device 10, the data transmission source mobile body 20, and each data relay mobile body 22 have the same configurations as those in FIG. On the other hand, the second base station device 18 is provided with a plurality of antennas, the data transmission source mobile body 20 is provided with a plurality of antennas for the second wireless communication network, and each data relay mobile body 22 is provided with the second wireless communication network. Equipped with multiple antennas for. Here, the differences from the past will be mainly described. In the third embodiment, (1) movement processing, (1') preparation processing, and (2) relay processing are executed in order.

(1) Mobile processing When the second communication area capable of communicating with the second base station device 18 does not include a disaster occurrence site, the mobile processing unit 32 is used for the first data relay mobile body 22a and the second data relay. Determine the use of the moving body 22b. The processing unit 32 is located in the second communication area, but is capable of ad hoc communication with the data transmission source mobile body 20 existing at the disaster site (hereinafter, "first relay position"). And "second relay position"). For example, the processing unit 32 sets two points separated by a predetermined distance as a first relay position and a second relay position in the vicinity of the intermediate point between the position of the second base station device 18 and the disaster occurrence site. Identify. The processing unit 32 generates a second control signal including a second movement instruction to the first relay position, and the first communication unit 34 uses the first network 12 and the first base station device 14 to generate a second control signal. 1 A second control signal is transmitted to the data relay mobile body 22a. Further, the processing unit 32 generates a second control signal including a second movement instruction to the second relay position, and the first communication unit 34 passes through the first network 12 and the first base station device 14. , A second control signal is transmitted to the second data relay mobile body 22b.

The first communication unit 60 of the first data relay mobile body 22a receives the second control signal from the first base station device 14. The first communication unit 60 outputs the second control signal to the processing unit 62. The processing unit 62 extracts the second movement instruction from the second control signal and specifies the first relay position based on the second movement instruction. The processing unit 62 controls the operation of the drive unit 66 so that the current position received from the positioning unit 64 approaches the first relay position. By the operation of the drive unit 66, the first data relay moving body 22a moves toward the first relay position. When the processing unit 62 determines the arrival at the first relay position, the processing unit 62 generates a second response signal including the arrival report. The first communication unit 60 transmits a second response signal to the control device 10 via the first base station device 14 and the first network 12.

The first communication unit 60 of the second data relay mobile body 22b receives the second control signal from the first base station device 14. The first communication unit 60 outputs the second control signal to the processing unit 62. The processing unit 62 extracts the second movement instruction from the second control signal and specifies the second relay position based on the second movement instruction. The processing unit 62 controls the operation of the drive unit 66 so that the current position received from the positioning unit 64 approaches the second relay position. By the operation of the drive unit 66, the second data relay moving body 22b moves toward the second relay position. When the processing unit 62 determines the arrival at the second relay position, the processing unit 62 generates a second response signal including the arrival report. The first communication unit 60 transmits a second response signal to the control device 10 via the first base station device 14 and the first network 12. The first communication unit 34 of the control device 10 receives the second response signal from the first data relay mobile body 22a and receives the second response signal from the second data relay mobile body 22b, and receives them. Output to the processing unit 32. When the processing unit 32 receives these second response signals from the first communication unit 34, the processing unit 32 confirms the arrival report included in the second response signal, and the first data relay mobile body 22a is in the first relay position. Recognizes that the second data relay moving body 22b has arrived at the second relay position.

(1') Preparatory processing The processing unit 32 of the control device 10 has a second control including an estimation instruction and a transmission instruction for each of the first data relay mobile body 22a and the second data relay mobile body 22b. Generate a signal. The processing unit 32 outputs the second control signal to the first communication unit 34. The first communication unit 34 transmits a second control signal to the first data relay mobile body 22a and the second data relay mobile body 22b via the first network 12 and the first base station device 14.

The first communication unit 60 of the first data relay mobile body 22a and the second data relay mobile body 22b receives the second control signal from the first base station apparatus 14. The first communication unit 60 outputs the second control signal to the processing unit 62. The processing unit 62 extracts an estimation instruction and a transmission instruction from the second control signal. The second communication unit 68 receives the training signal from the data transmission source mobile body 20 at each of the plurality of antennas according to the estimation instruction, and estimates the transmission line characteristics. The second communication unit 68 outputs the estimated transmission line characteristics to the processing unit 62. The processing unit 62 generates a second response signal including the transmission line characteristics received from the second communication unit 68. The first communication unit 60 transmits a second response signal to the control device 10 via the first base station device 14 and the first network 12.

Further, the processing unit 62 causes the second communication unit 68 to transmit the training signal according to the transmission instruction. The second communication unit 68 transmits a training signal from each of the plurality of antennas to the second base station device 18. The second base station apparatus 18 receives training signals from each of the first data relay mobile body 22a and the second data relay mobile body 22b at each of the plurality of antennas, and estimates the transmission line characteristics. The second base station device 18 transmits the transmission line characteristics to the control device 10 via the second network 16.

The first communication unit 34 of the control device 10 receives the second response signal from each of the first data relay mobile body 22a and the second data relay mobile body 22b, and outputs the second response signal to the processing unit 32. do. When the processing unit 32 receives the second response signal from the first communication unit 34, the processing unit 32 extracts the transmission line characteristics included in the second response signal. This shows the characteristics of the transmission line from the data transmission source mobile body 20 to the two data relay mobile bodies 22. Based on the transmission line characteristics, the processing unit 32 sets at least one of the transmission weights for the plurality of antennas of the data transmission source mobile body 20 and the reception weights for the respective plurality of antennas of the two data relay mobile bodies 22. Derived. Such weights are used to execute coordinated transmission by the first data relay mobile body 22a and the second data relay mobile body 22b, and a known technique is used for deriving the weights. When the transmission weight is derived, the processing unit 32 generates a first control signal including the transmission weight, and causes the first communication unit 34 to transmit the first control signal to the data transmission source mobile body 20. Further, when the reception weight is derived, the processing unit 32 generates a second control signal including the reception weight, and causes the first communication unit 34 to transmit the second control signal to the two data relay mobile bodies 22. ..

The second communication unit 36 of the control device 10 receives the transmission line characteristics from the second base station device 18 and outputs the transmission line characteristics to the processing unit 32. The processing unit 32 receives the transmission line characteristics from the second communication unit 36. This shows the characteristics of the transmission line from the two data relay mobiles 22 to the second base station device 18. The processing unit 32 derives at least one of the transmission weights for the plurality of antennas of the two data relay mobile bodies 22 and the reception weights for the plurality of antennas of the second base station device 18 based on the transmission line characteristics. When the transmission weight is derived, the processing unit 32 generates a second control signal including the transmission weight, and transmits the second control signal from the first communication unit 34 to the first data relay moving body 22a and the second data relay. It is transmitted to the mobile body 22b. When the receiving weight is derived, the processing unit 32 causes the second communication unit 36 to transmit the receiving weight to the second base station device 18. That is, the control device 10 determines the weight, which is the content of the process for causing the first data relay mobile body 22a and the second data relay mobile body 22b to execute cooperative transmission in the communication by the second wireless communication network. .. Further, the control device 10 transmits a second control signal including the determined weight to the first data relay mobile body 22a and the second data relay mobile body 22b by the first wireless communication network.

The first communication unit 60 of the first data relay mobile body 22a and the second data relay mobile body 22b receives the second control signal from the first base station apparatus 14. The first communication unit 60 outputs the second control signal to the processing unit 62. The processing unit 62 extracts at least one of the receiving weight and the transmitting weight from the second control signal. Further, the second base station device 18 receives the reception weight from the control device 10 via the second network 16.

(2) Relay processing As in the past, the processing unit 32 of the control device 10 has a second control including a relay instruction for the first data relay mobile body 22a and the second data relay mobile body 22b. Generate a signal. The first communication unit 34 transmits a second control signal to the first data relay mobile body 22a and the second data relay mobile body 22b via the first network 12 and the first base station device 14.

The first communication unit 60 of the first data relay mobile body 22a and the second data relay mobile body 22b receives the second control signal from the first base station apparatus 14. The first communication unit 60 outputs the second control signal to the processing unit 62. The processing unit 62 extracts a relay instruction from the second control signal. The second communication unit 68 receives the data from the second communication unit 48 of the data transmission source mobile body 20 with the plurality of antennas, and outputs the received data to the processing unit 62. At that time, if the receiving weight is received, the processing unit 62 weights the data according to the receiving weight. If the processing unit 62 receives the transmission weight, the processing unit 62 weights the data according to the transmission weight. The processing unit 62 causes the second communication unit 68 to transmit the data. At that time, the data is transmitted from a plurality of antennas.

The first data relay mobile body 22a and the second data relay mobile body 22b synchronize the transmission timing when transmitting data. The transmission timing may be specified by a second control signal from the control device 10. Further, the transmission timing may be specified by ad hoc communication in the second wireless communication network from one of the first data relay mobile body 22a and the second data relay mobile body 22b to the other.

The second base station apparatus 18 receives data from the second communication unit 68 of the first data relay mobile body 22a and the second data relay mobile body 22b with a plurality of antennas. If the second base station device 18 receives the reception weight, the second base station device 18 weights the data according to the reception weight. The second communication unit 36 of the control device 10 receives the data from the second base station device 18. The second communication unit 36 outputs data to the processing unit 32. The processing unit 32 extracts an image from the received data. The processing unit 32 may reproduce the video.

The operation of the wireless relay system 100 with the above configuration will be described. FIG. 6 is a sequence diagram showing a relay procedure by the wireless relay system 100. The control device 10 transmits the first control signal to the data transmission source mobile body 20 (S100). The data transmission source mobile body 20 moves to and arrives at the disaster occurrence site (S102). The control device 10 transmits the second control signal to the first data relay mobile body 22a (S104). The first data relay moving body 22a moves to the relay position and arrives (S106). The control device 10 transmits the second control signal to the second data relay mobile body 22b (S108). The second data relay moving body 22b moves to the relay position and arrives (S110).

The data transmission source moving body 20 transmits the first response signal to the control device 10 (S112), the first data relay moving body 22a transmits the second response signal to the control device 10 (S114), and the second data. The relay moving body 22b transmits a second response signal to the control device 10 (S116). The control device 10 transmits the first control signal to the data transmission source moving body 20 (S118), transmits the second control signal to the first data relay moving body 22a (S120), and transmits the second control signal to the first data relay moving body 22a (S120). 2 The data is transmitted to the data relay moving body 22b (S122). The first data relay moving body 22a estimates the transmission line characteristics (S126), and the second data relay moving body 22b also estimates the transmission line characteristics (S128). The first data relay moving body 22a transmits a second response signal to the control device 10 (S132), and the second data relay moving body 22b transmits a second response signal to the control device 10 (S134). The control device 10 derives the weight (S136).

The control device 10 transmits the first control signal to the data transmission source moving body 20 (S138), transmits the second control signal to the first data relay moving body 22a (S140), and transmits the second control signal to the first data relay moving body 22a (S140). 2 The data is transmitted to the data relay moving body 22b (S142). The data transmission source mobile body 20 captures an image (S144), the data transmission source mobile body 20 transmits data to the first data relay mobile body 22a (S146), and the data is used for the second data relay. It is transmitted to the moving body 22b (S148). The first data relay moving body 22a transmits data to the control device 10 (S150), and the second data relay moving body 22b transmits data to the control device 10 (S152). The control device 10 acquires data (S154).

According to this embodiment, since the cooperative transmission is executed by using the first data relay mobile body and the second data relay mobile body, the transmission rate can be further increased. Further, since the weight for executing the coordinated transmission is derived in the control device, it is possible to suppress an increase in the processing amount of the data transmission source mobile body and the plurality of data relay mobile bodies. Further, since the increase in the processing amount of the data transmission source mobile body and the plurality of data relay mobile bodies is suppressed, the drive time of the data transmission source mobile body and the plurality of data relay mobile bodies can be lengthened by the battery.

(Example 4)
Next, Example 4 will be described. The fourth embodiment relates to a wireless relay system that executes wireless communication with a mobile body as before. Further, also in the fourth embodiment, control is performed by transmitting a control signal from the control device to the data transmission source mobile body and the data relay mobile body, and relaying the data from the data transmission source mobile body in the data relay mobile body. The device receives. Further, a first wireless communication network is used for transmission of control signals, and a second wireless communication network is used for data relay. The fourth embodiment aims to further increase the transmission rate in the second wireless communication network. Therefore, in the second embodiment, the data relay moving body is moved at the data reception timing and the data transmission timing. In the following, the differences from the past will be mainly explained.

FIG. 7 shows the configuration of the wireless relay system 100. Similar to FIG. 3, the wireless relay system 100 includes a control device 10, a first network 12, a first base station device 14, a second network 16, a second base station device 18, a data transmission source mobile body 20, and data relay. The moving body 22 is included. Here, the differences from the past will be mainly described. In the fourth embodiment, (1) movement processing, (1') preparation processing, and (2) relay processing are executed in order.

(1) Mobile processing The processing unit 32 decides to use the data relay mobile body 22 when the disaster occurrence site is not included in the second communication area capable of communicating with the second base station device 18. The processing unit 32 specifies a relay position P1 close to the data transmission source mobile body 20 and a relay position P2 close to the second base station device 18 as relay positions. The relay position P1 is a position when the data relay mobile body 22 receives data from the data transmission source mobile body 20 by the second wireless communication network, and is a position when the data relay mobile body 22 receives data from the data transmission source mobile body 20 outside the second communication area. It is arranged at a position separated from the body 20 by a predetermined distance. Here, the processing distance is determined so that the communication speed with the data transmission source mobile body 20 becomes the maximum value.

On the other hand, the relay position P2 is a position when the data relay mobile body 22 transmits data to the second base station device 18 via the second wireless communication network, and the second base station device 18 is located in the second communication area. It is placed at a position a predetermined distance away from. Here, the processing distance is determined so that the communication speed with the second base station apparatus 18 becomes the maximum value. The processing unit 32 generates a second control signal including the position information of the relay position P1 and the relay position P2 and the second movement instruction to the relay position P1, and the first communication unit 34 generates the first network 12, A second control signal is transmitted to the data relay mobile body 22 via the first base station device 14.

The first communication unit 60 of the first data relay mobile body 22a receives the second control signal from the first base station device 14. The first communication unit 60 outputs the second control signal to the processing unit 62. The processing unit 62 extracts the second movement instruction from the second control signal and specifies the relay position P1 based on the second movement instruction. The processing unit 62 controls the operation of the drive unit 66 so that the current position received from the positioning unit 64 approaches the relay position P1. By the operation of the drive unit 66, the data relay moving body 22 moves toward the relay position P1. When the processing unit 62 determines the arrival at the relay position P1, it generates a second response signal including the arrival report. The first communication unit 60 transmits a second response signal to the control device 10 via the first base station device 14 and the first network 12.

The first communication unit 34 of the control device 10 receives the second response signal from the data relay mobile body 22 and outputs the second response signal to the processing unit 32. When the processing unit 32 receives the second response signal from the first communication unit 34, the processing unit 32 confirms the arrival report included in the second response signal, and confirms that the data relay moving body 22 has arrived at the relay position P1. recognize.

(1') Preparation process The processing unit 32 of the control device 10 generates a second control signal including an estimation instruction and a transmission instruction for the data relay moving body 22. The processing unit 32 outputs the second control signal to the first communication unit 34. The first communication unit 34 transmits a second control signal to the first data relay mobile body 22a and the second data relay mobile body 22b via the first network 12 and the first base station device 14.

The first communication unit 60 of the data relay mobile body 22 receives the second control signal from the first base station device 14. The first communication unit 60 outputs the second control signal to the processing unit 62. The processing unit 62 extracts an estimation instruction and a transmission instruction from the second control signal. The second communication unit 68 receives the training signal from the data transmission source mobile body 20 at each of the plurality of antennas at the relay position P1 according to the estimation instruction, and estimates the transmission line characteristics. The second communication unit 68 outputs the estimated transmission line characteristics to the processing unit 62. The processing unit 62 generates a second response signal including the transmission line characteristics received from the second communication unit 68. The first communication unit 60 transmits a second response signal to the control device 10 via the first base station device 14 and the first network 12.

Following this, the processing unit 62 controls the operation of the drive unit 66 so that the current position received from the positioning unit 64 approaches the relay position P2. By the operation of the drive unit 66, the data relay moving body 22 moves toward the relay position P2. When the processing unit 62 determines the arrival at the relay position P2, the processing unit 62 causes the second communication unit 68 to transmit the training signal. The second communication unit 68 transmits a training signal from each of the plurality of antennas to the second base station device 18. After that, the processing unit 62 controls the operation of the drive unit 66 so that the data relay moving body 22 approaches the relay position P1. The second base station device 18 receives the training signal from the data relay mobile body 22 at each of the plurality of antennas, and estimates the transmission line characteristics. The second base station device 18 transmits the transmission line characteristics to the control device 10 via the second network 16.

The first communication unit 34 of the control device 10 receives the second response signal from the data relay mobile body 22 and outputs the second response signal to the processing unit 32. When the processing unit 32 receives the second response signal from the first communication unit 34, the processing unit 32 extracts the transmission line characteristics included in the second response signal. This shows the characteristics of the transmission line from the data transmission source mobile body 20 to the data relay mobile body 22 at the relay position P1. The processing unit 32 derives at least one of the transmission weights for the plurality of antennas of the data transmission source mobile body 20 and the reception weights for the plurality of antennas of the data relay mobile body 22 based on the transmission line characteristics. When the transmission weight is derived, the processing unit 32 generates a first control signal including the transmission weight, and causes the first communication unit 34 to transmit the first control signal to the data transmission source mobile body 20. When the reception weight is derived, the processing unit 32 generates a second control signal including the reception weight, and causes the first communication unit 34 to transmit the second control signal to the data relay mobile body 22.

The second communication unit 36 of the control device 10 receives the transmission line characteristics from the second base station device 18 and outputs the transmission line characteristics to the processing unit 32. The processing unit 32 receives the transmission line characteristics from the second communication unit 36. This shows the characteristics of the transmission line from the data relay mobile body 22 at the relay position P2 to the second base station device 18. The processing unit 32 derives at least one of the transmission weights for the plurality of antennas of the data relay mobile body 22 and the reception weights for the plurality of antennas of the second base station device 18 based on the transmission line characteristics. When the transmission weight is derived, the processing unit 32 generates a second control signal including the transmission weight, and causes the first communication unit 34 to transmit the second control signal to the data relay mobile body 22. When the receiving weight is derived, the processing unit 32 causes the second communication unit 36 to transmit the receiving weight to the second base station device 18.

The first communication unit 60 of the data relay mobile body 22 receives the second control signal from the first base station device 14. The first communication unit 60 outputs the second control signal to the processing unit 62. The processing unit 62 extracts at least one of the receiving weight and the transmitting weight from the second control signal. Further, the second base station device 18 receives the reception weight from the control device 10 via the second network 16.

(2) Relay processing The processing unit 32 of the control device 10 generates a second control signal including a relay instruction for the data relay mobile body 22. The first communication unit 34 transmits a second control signal to the data relay mobile body 22 via the first network 12 and the first base station device 14.

The first communication unit 60 of the data relay mobile body 22 receives the second control signal from the first base station device 14. The first communication unit 60 outputs the second control signal to the processing unit 62. The processing unit 62 extracts the relay instruction from the second control signal and relays the data to the second communication unit 68 according to the relay instruction. The second communication unit 68 receives the data from the second communication unit 48 of the data transmission source mobile body 20 by the plurality of antennas at the relay position P1, and outputs the received data to the processing unit 62. At that time, if the receiving weight is received, the processing unit 62 weights the data according to the receiving weight.

Following this, the processing unit 62 controls the operation of the drive unit 66 so that the current position received from the positioning unit 64 approaches the relay position P2. By the operation of the drive unit 66, the data relay moving body 22 moves toward the relay position P2. When the processing unit 62 determines that the data has arrived at the relay position P2, if the transmission weight is received, the processing unit 62 weights the data according to the transmission weight. The processing unit 62 causes the second communication unit 68 to transmit data at the relay position P2. At that time, the data is transmitted from a plurality of antennas. After that, the processing unit 62 controls the operation of the drive unit 66 so that the data relay moving body 22 approaches the relay position P1. That is, the data relay mobile body 22 receives the data from the data transmission source mobile body 20 at the relay position P1, moves from the relay position P1 to the relay position P2, and relays the data to the second base station device 18. It is transmitted in P2.

The second base station device 18 receives data from the second communication unit 68 of the data relay mobile body 22 at the relay position P2 with a plurality of antennas. If the second base station device 18 receives the reception weight, the second base station device 18 weights the data according to the reception weight. The second communication unit 36 of the control device 10 receives the data from the second base station device 18. The second communication unit 36 outputs data to the processing unit 32. The processing unit 32 extracts an image from the received data. The processing unit 32 may reproduce the video.

According to this embodiment, since the data relay mobile body is moved to the relay position P1 and the data from the data transmission source mobile body is received, transmission between the data relay mobile body and the data transmission source mobile body is performed. The distance can be shortened. Further, since the transmission distance between the data relay mobile body and the data transmission source mobile body is shortened, the transmission rate can be further increased. Further, since the data relay mobile body is moved to the relay position P2 and the data is transmitted to the second base station device 18, the transmission distance between the data relay mobile body and the second base station device can be shortened. Further, since the transmission distance between the data relay mobile body and the second base station device is shortened, the transmission rate can be further increased. Further, since the data relay moving body is moved between the relay position P1 and the relay position P2, it is possible to suppress an increase in the amount of movement of the data transmission source moving body. Further, since the increase in the moving amount of the moving body for the data transmission source is suppressed, the imaging time in the moving body for the data transmission source can be lengthened.

The present invention has been described above based on examples. This embodiment is an example, and it is understood by those skilled in the art that various modifications are possible for each of these components and combinations of each processing process, and that such modifications are also within the scope of the present invention. ..

In the second to fourth embodiments, the data transmission source mobile body 20, the data relay mobile body 22, and the second base station device 18 include a plurality of antennas for the second wireless communication network, and the processing unit 32 of the control device 10 includes a plurality of antennas. Derives the weights for them as the content of the process. However, the present invention is not limited to this, and for example, the processing unit 32 of the control device 10 may select the antenna in the selection diversity as the processing content. Further, the data transmission source mobile body 20, the data relay mobile body 22, and the second base station device 18 are provided with a directional antenna for the second wireless communication network, and the processing unit 32 is directional as the content of the processing. The direction in which the antenna is directed may be derived. According to this modification, the degree of freedom of configuration can be improved.

It may be any combination of Examples 1 to 4. According to this modification, the effect of any combination of Examples 1 to 4 can be obtained.

10 Control device, 12 1st network, 14 1st base station device, 16 2nd network, 18 2nd base station device, 20 Data source mobile unit, 22 Data relay mobile unit, 30 Operation unit, 32 Processing unit , 34 1st communication unit, 36 2nd communication unit, 40 1st communication unit, 42 processing unit, 44 positioning unit, 46 drive unit, 48 2nd communication unit, 50 imaging unit, 60 1st communication unit, 62 processing unit , 64 Positioning unit, 66 Drive unit, 68 Second communication unit, 100 Wireless relay system.

Claims (4)

A control device capable of communicating with the first wireless communication network and the second wireless communication network,
A mobile body for a data source that can communicate and move between the first wireless communication network and the second wireless communication network,
It is equipped with a mobile body for data relay that can communicate with the first wireless communication network and the second wireless communication network and is also mobile.
The data transmission source mobile body transmits data to the data relay mobile body by the second wireless communication network at a position moved according to the first control signal received from the control device by the first wireless communication network. ,
The data relay moving body receives data from the data transmitting source moving body by the second wireless communication network at a position moved according to the second control signal received from the control device by the first wireless communication network. At the same time, data is transmitted to the control device by the second wireless communication network.
The control device is a wireless relay system characterized in that data from the data relay mobile body is received by a second wireless communication network. The data relay mobile body includes a plurality of antennas and has a plurality of antennas.
The control device determines the content of processing when a plurality of antennas provided in the data relay mobile body are used for communication by the second wireless communication network, and the second control signal including the content of the determined processing. The wireless relay system according to claim 1, wherein the data is transmitted to the data relay mobile body by the first wireless communication network. The data relay mobile body includes a first data relay mobile body and a second data relay mobile body.
The control device determines and determines the content of processing for causing the first data relay mobile body and the second data relay mobile body to execute cooperative transmission in communication by the second wireless communication network. The first aspect of claim 1 is characterized in that a second control signal including the content of processing is transmitted to the first data relay mobile body and the second data relay mobile body by the first wireless communication network. The described wireless relay system. The control device transmits data to the control device by the second wireless communication network and a first position when the data relay mobile body receives data from the data transmission mobile body by the second wireless communication network. A second control signal including the second position when the data relay mobile body transmits is transmitted to the data relay mobile body by the first wireless communication network.
The data relay mobile body receives data from the data transmission source mobile body at the first position by the second wireless communication network, moves from the first position to the second position, and is said by the second wireless communication network. The wireless relay system according to claim 1, wherein data is transmitted to the control device at a second position.

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