JP2017188709A - Transmission device, transmission method, and transmission program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable communication between mobile objects capable of moving in an arbitrary direction.SOLUTION: A transmission device (91) comprises: a position detection part (11) for acquiring an absolute geographical position of an own device; an azimuth detection part (12) for detecting an azimuth; a virtual beam determination part (31) for determining a collimation and shape of a virtual beam as an ideal beam emitted from a transmission antenna 14 by using the geographical position acquired by the position detection part (11) and the azimuth detected by the azimuth detection part (12); and an antenna control part (32) for causing the transmission antenna (14) to transmit an antenna beam having the collimation and shape corresponding to the virtual beam.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a transmission apparatus, a transmission method, and a transmission program for transmitting a radio signal.

  With the technological innovation of IoT (Internet of Things) and AI (Artificial Intelligence), semi-automated and fully-automated moving bodies such as cars, ships, and airplanes are progressing. In order to automate a mobile body, collaborative work between mobile bodies or between a mobile body and a person, information sharing requires instantaneous one-to-one or one-to-many communication between adjacent mobile bodies (for example, (Refer nonpatent literature 1.).

  The communication system of Non-Patent Document 1 includes a communication device including two directional antennas, front and rear, mounted on a vehicle, a signal received from the front of the vehicle is transmitted to the rear of the vehicle, and a signal received from the rear of the vehicle is Forward one way.

Kuribayashi et al., “Characteristic analysis of broadcast communication system with delay tolerance for VANET”, IEICE technical report. IN, Information Network 109 (37), pp. 19-24, 2009-05-14

  For communication between arbitrary mobile bodies, it is preferable to perform flexible communication using the spatial positional relationship of the mobile bodies. In particular, in the case of a drone or robot that can move in any direction, the direction of signal transfer is not determined. The system of Non-Patent Document 1 cannot be applied to a moving body that can move in any direction because the signal transfer direction is only forward or backward.

  Therefore, an object of the present invention is to enable communication between moving bodies that are movable in an arbitrary direction.

Specifically, the transmission device according to the present invention is:
A position detector that acquires the absolute geographical position of the device;
A direction detection unit for detecting the direction;
A virtual beam determination unit that determines the aim and shape of a virtual beam that is an ideal beam radiated from an antenna, using the geographical position acquired by the position detection unit and the direction detected by the direction detection unit;
An antenna control unit for transmitting an antenna beam having an aim and a shape according to the virtual beam to the antenna;
Is provided.

Specifically, the transmission method according to the present invention is:
A position detecting step for obtaining an absolute geographical position of the device;
A direction detecting step for detecting a direction;
A virtual beam determining step for determining the aim and shape of a virtual beam, which is an ideal beam radiated from an antenna, using the geographical position acquired in the position detecting step and the direction detected in the direction detecting step;
An antenna control step of causing the antenna to transmit an antenna beam having an aim and a shape corresponding to the virtual beam;
Is provided.

  Specifically, the transmission program according to the present invention is a program for causing a computer to execute each step included in the transmission method according to the present invention. The program may be recorded on a computer-readable recording medium.

  ADVANTAGE OF THE INVENTION According to this invention, communication between the mobile bodies which can move to arbitrary directions can be enabled.

An example of the communication system which concerns on this embodiment is shown. An example of the hierarchical structure of the communication function which concerns on this embodiment is shown. 2 shows a configuration example of a communication apparatus according to the present embodiment. An example of a virtual beam and an antenna beam is shown. An example of the coordinate which specifies the aim of a virtual beam is shown. 10 shows a first example of a virtual beam BI according to the second embodiment. 6 shows a second example of a virtual beam BI according to the second embodiment. 8 shows a third example of a virtual beam BI according to the second embodiment. 4 shows a fourth example of a virtual beam BI according to the second embodiment. 10 shows a fifth example of a virtual beam BI according to the second embodiment. 6 shows a sixth example of a virtual beam BI according to the second embodiment. 7 shows a seventh example of a virtual beam BI according to the second embodiment. 10 shows an eighth example of a virtual beam BI according to the second embodiment. An example of the communication apparatus which concerns on Embodiment 3 is shown. 10 shows a first example of a virtual beam BI according to a third embodiment. 10 shows a second example of a virtual beam BI according to the third embodiment. 10 shows a third example of a virtual beam BI according to the third embodiment. An example of the communication apparatus which concerns on Embodiment 4 is shown. 10 shows a first example of a virtual beam BI according to a fourth embodiment. 10 shows a second example of a virtual beam BI according to the fourth embodiment. 10 shows a third example of a virtual beam BI according to the fourth embodiment. 10 illustrates an example of a communication apparatus according to a fifth embodiment. 10 shows an example of a virtual beam BI according to the fifth embodiment. 10 illustrates an example of a communication apparatus according to a seventh embodiment. 18 illustrates an example of a virtual beam BI according to the seventh embodiment. The structural example of the communication system which concerns on Embodiments 9-11 is shown. 10 shows a configuration example of a communication system according to Embodiment 10. 12 shows a configuration example of a communication system according to Embodiment 11.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited to embodiment shown below. These embodiments are merely examples, and the present invention can be implemented in various modifications and improvements based on the knowledge of those skilled in the art. In the present specification and drawings, the same reference numerals denote the same components.

(Embodiment 1)
FIG. 1 shows an example of a communication system according to the present embodiment. The communication system according to the present embodiment includes a plurality of communication devices 91 mounted on a movable body that can move. The moving body is arbitrary, for example, a person or a robot. The moving range of the moving body is arbitrary, for example, it may be on the ground like a car or a train, or may be on the water or underwater like a boat, yacht or submarine, a drone, an aircraft, a satellite or It may be in the air or space like a spacecraft. The communication system according to the present embodiment preferably uses RCL (Relay Control Layer) for the cooperative operation of each of the communication devices 91-1, 91-2,.

  FIG. 2 shows an example of a hierarchical structure of communication functions provided in the communication device 91. The function of the communication device 91 in this embodiment is a new layer (RCL: Relay) in seven layers of the OSI (Open Systems Interconnection) reference model or four layers of the TCP / IP (Transmission Control Protocol / Internet Protocol) model. Control Layer) is added and realized as a newly added RCL function. The upper layer of the RCL may be the Internet layer of the TCP / IP model or a new network layer / transport layer that will newly appear in the future. The network interface layer may be existing WiFi (registered trademark) or BlueTooth (registered trademark), or may be a new network interface layer that will appear in the future. The RCL can perform transfer and transmission / reception processing in units of frames, and can add information necessary for processing to the frames. The communication system according to the present embodiment is based on broadcast transfer without requiring prior routing, but may operate in cooperation with a routing protocol and perform unicast transfer.

  The communication device 91-1 functions as a transmission node and transmits a frame. The communication device 91-2 functions as a transfer node and transfers the received frame. The communication device 91-3 functions as a destination node and receives a frame. The transmission node and the forwarding node function as a transmission node when transmitting a frame. The forwarding node and the destination node function as a receiving node when receiving a frame. When each communication device 91 functions as a transmission node, it determines a direction for transmitting a frame for each frame, and transmits the frame in that direction.

  Each communication device 91 has a unique node ID, and each frame has a unique frame ID. The node ID is arbitrary identification information unique to each communication device 91, and is, for example, a MAC address. The frame ID is arbitrary identification information unique to each frame, and is, for example, a sequence number. The frame ID may be a combination of a node ID of the transmission node and a sequence number created by the transmission node.

  The source node includes the node ID and sequence number of its own device in the frame. The transmission node may further include a transmission position indicating the position of the own device in the frame, or may include a transmission time indicating the time when the frame is transmitted in the frame.

  The forwarding node includes the node ID of its own device in the frame. The forwarding node may include a transmission position indicating the position of the own device at the time of frame transmission in the frame. The forwarding node may include the forwarding history in the frame. The transfer history is, for example, the number of hops or the transfer route length.

  FIG. 3 shows a configuration example of the communication apparatus according to the present embodiment. The communication device 91 according to the present embodiment includes a position detection unit 11, a direction detection unit 12, and an RCL including a virtual beam determination unit 31, an antenna control unit 32, a frame generation unit 33, and a reception processing unit 34. The network interface layer includes a transmission antenna 14 and a reception antenna 15 inside.

  The communication device 91 may be realized by causing a computer to function as each function provided in the communication device 91. In this case, each configuration is realized by a CPU (not shown) in the communication device 91 executing a computer program stored in a storage unit (not shown).

  The position detection unit 11 acquires the absolute geographical position of the device itself and outputs position information. The acquisition method is arbitrary, and for example, a satellite positioning system can be used. The direction detection unit 12 is, for example, a geomagnetic sensor, an acceleration sensor, or an orientation sensor, detects a direction, and outputs direction information.

  The frame generation unit 33 generates a frame transmitted by the communication device 91. The frame is preferably an RCL frame processed by RCL. The transmission antenna 14 transmits a radio signal according to control from the antenna control unit 32. The receiving antenna 15 receives a radio signal. The reception processing unit 34 receives a frame.

  FIG. 4 shows an example of the transmission antenna 14. The transmission antennas 14A to 14D are preferably antennas having directivity in a specific direction with respect to the communication device 91 and capable of beam forming. Since the connection between the communication device 91 and the transmission antennas 14A to 14D is fixed, it is possible to detect when, where, and which antenna is directed in which direction. Similarly to the transmission antenna 14, the reception antenna 15 may have directivity in a specific direction with respect to the communication device 91. The transmission antenna 14 and the reception antenna 15 may be a common antenna.

  In addition, it is preferable to install a shielding plate between the transmission antennas 14A to 14D. The number of transmission antennas 14 is not limited to four, and may be any number such as two, six, or eight. For example, in the case of the transmission antenna 14 in which the direction of the antenna beam BA is variable in accordance with the destination direction of the virtual beam BI, the number of transmission antennas 14 can be reduced to one. Further, the direction in which the antennas 14A to 14D have directivity is not limited to the horizontal direction, and may be a vertical direction as shown in FIG.

  The virtual beam determination unit 31 uses the direction information to detect which direction the transmission antenna 14 is facing. Then, the virtual beam determining unit 31 determines the aim and shape of the virtual beam using the position information and the direction information. The virtual beam is an ideal beam radiated from the transmitting antenna 14. The antenna control unit 32 causes the transmission antenna 14 to transmit the frame generated by the frame generation unit 33. At this time, each transmission antenna 14 is controlled so that the antenna beam transmitted from each transmission antenna 14 has an aim and shape corresponding to the virtual beam. Accordingly, the communication device 91 can transmit a frame toward a specific absolute destination direction even if the communication device rotates or moves.

  Thus, the communication device 91 radiates the antenna beam in a specific destination direction. For this reason, it is preferable that the transmission antenna 14 is an antenna having directivity with variable aiming and shape of the antenna beam. Further, since the communication device 91 transmits a frame toward a specific absolute destination direction, the communication device 91 communicates between mobile bodies that can move in any direction while suppressing radio wave interference between the communication devices 91. be able to.

FIG. 4 shows an example of a virtual beam and an antenna beam. NE sight of each antenna beam of the transmitting antenna 14A~14D respectively, southeast, southwest, and northwest, aiming _{S I} of the virtual beam BI is NNE, the angle theta _I is 135 ° showing the beam shape of the virtual beam BI The transmitting antennas 14A and 14D radiate the antenna beam BA. At this time, it is preferable that the transmission antenna 14D outputs the antenna beam BA only in a range overlapping with the virtual beam BI. Further, only the transmission antenna 14A that most covers the destination direction to be transmitted may output the antenna beam BA.

  The aim of the virtual beam is arbitrary, and may be, for example, a coordinate or a direction. The coordinates are, for example, a direction and a distance from the own device such as 157.5 ° south-southeast and a distance of 200 m and 45 ° above and 200 m as shown in FIG. The coordinates are, for example, a combination of latitude, longitude, and altitude, such as north latitude 35 ° 42'18 '', east longitude 139 ° 44'13 '', and altitude 1 m. The direction may be specified in the horizontal direction and the vertical direction such as 157.5 ° south-southeast and 45 ° above.

The shape of the virtual beam is arbitrary, and is, for example, spherical or elliptical spherical or a part thereof. For some spherical or spheroidal shape of the virtual beam BI is may be at an angle theta _I cut a spherical surface around the direct and coordinate the own apparatus and the sight S _I of the aiming S _I. However, as will be described later, the shape of the virtual beam BI can be any shape that facilitates the formation of the transmission antenna 14. In that case, the shape of the virtual beam BI, instead of the angle theta _I, the optional parameters corresponding to the transmitting antenna 14.

  As described above, each communication device 91 determines the virtual beam BI when transmitting a frame, and radiates the antenna beam BA in accordance with the virtual beam BI. For this reason, the communication apparatus 91 and the communication system using the same according to the present embodiment can operate by recognizing the position of the own apparatus and the direction in which the notification message is relayed in absolute coordinates.

(Embodiment 2)
Communication device 91 according to the present embodiment transmits the frame towards a destination space A _A. The virtual beam determination unit 31 determines the aim S _I and the shape of the virtual beam BI based on the destination space A _A indicating the destination of the frame.

The destination space A _A can be determined from the coordinates of the destination. The coordinates are, for example, a combination of latitude, longitude, and altitude. The destination space A _A may include a plurality of coordinates constituting the three-dimensional space. The shape of the three-dimensional space can be any shape according to the environment in which the communication system is used, and examples thereof include a square shape, a sphere shape, an elliptic sphere shape, a cone shape, and a combination thereof. For example, in a closed space such as a room, the shape of the three-dimensional space can be a square. The destination space A _A may be determined from the node ID of the destination node. In this case, the node ID of the destination node, derives a spatial the destination node is located destined space A _A. The destination space A _A may include the coordinates of the destination or the space around the destination node. The destination space A _A may be further determined based on time. As an example of determination based on time, when it is desired to use a train vehicle as the destination space, the destination space _AA is determined based on the train operation status and the current time.

Since the communication device 91 transmits a frame toward the destination space A _A, a communication system according to the embodiment, it is possible to perform information distribution to the destination space A _A. When the sending node is outside destination space A _A, it is possible to efficiently transfer frames to a destination space A _A. This makes it possible to distribute a coupon that can be used within a certain area to a communication device that approaches the area, or to a signage within the area. The transmitting node when the destination space A _A can be uniformly just enough to go without span a frame in the destination space A _A. As a result, the existence of robots moving in the same area can be known. The destination space A _A may be a destination direction for the own device. This can be applied to alerts that are issued in the direction of travel by cars or drones. This is especially useful at intersections and curves.

6 shows an example of a virtual beam BI when the antenna beam BA does not reach the destination space A _A. The coordinates of the straight line connecting the point sight S _I of the virtual beam BI is located in the communication device 91 and a destination space A _A, including the destination space A _A in the angle theta _I showing the shape of a virtual beam BI. A point located in the destination space A _A is capable of 1 or above any point located in the destination space A _A, for example, a P _RC point located in the center of the destination space A _A may be, it may be a P _RE point located at the end of the destination space a _a.

Figure 7 shows an example of a virtual beam BI when the antenna beam BA reaches the destination space A _A. The aim S _I of the virtual beam BI is a coordinate in the destination space A _A , the shape of the virtual beam BI is a sphere, and the destination space A _A is included in an angle θ _I for cutting the sphere. When the distance R _I from the communication device 91 to the destination space A _A is known, the virtual beam determination unit 31 may further determine the distance D _I of the virtual beam BI in addition to the aim S _I and shape of the virtual beam BI. Good.

Here, the angle θ _I indicating the shape of the virtual beam BI may be different depending on the distance from the transmission position of the transmission node. For example, when the communication device 91 is an orbiting satellite, the orbiting speed is faster as the satellite is farther from the earth. In this case, as shown in FIG. 8, the angle theta _I -1 of the communication device 91-1, the angle theta _I -2 communication device 91-2, the order of the angle theta _I -3 communication device 91-3, the angle It is preferable to increase. As a result, the reception probability can be improved even with a high altitude orbiting satellite. In addition, the distance from the transmission position of the transmission node is not limited to the linear distance, but may be the number of hops from the transmission node, the transfer path length from the transmission node, or the transmission time of the transmission node. The elapsed time from the current time to the current time may be used.

The angle θ _I indicating the shape of the virtual beam BI may be different depending on the distance from the destination space A _A to the own apparatus. For example, when the destination space A _A is large, it is necessary to transfer to the destination space A _A using a plurality of transfer nodes. In this case, as shown in FIG. 9, the angle θ _I indicating the shape of the virtual beam BI is increased as the distance from the destination space A _A to the own apparatus is shorter. Specifically, the angle θ _I −1 of the communication device 91-1, the angle θ _I -2 of the communication device 91-2, the angles θ _I −3 and θ _I −4 of the communication devices 91-3 and 91-4 are in this order. The angle is preferably increased. Thus, even when the destination space A _A is large, it is possible to transfer the frame to the whole area in the destination space A _A. Note that the distance from the destination space A _A to the own device is not limited to the linear distance, and may be the number of hops from the destination space to the own device, or the transfer path length from the destination space to the own device. Alternatively, the remaining time from the current time to a predetermined time limit may be used. It is also effective when the receivable radio waves in the direction of the destination node in the destination space A _A is limited.

Note that the shape of the virtual beam BI is not limited to a sphere or an elliptical sphere, and may be a solid having a different shape. For example, as shown in FIG. 10, the shape which cut off the cylinder (elliptical pillar) may be sufficient. In this case, the shape of the virtual beam BI includes the height _{H I.}

11 shows an example of a virtual beam BI when the communication device 91 is in contact with the end point of the destination space A _A. 12 shows an example of a virtual beam BI when the communication device 91 is in contact with one side of the destination space A _A. When the communication device 91 is in contact with the end point or one side of the destination space A _A, virtual sight S _I beam BI are the coordinates in the destination space A _A, the angle theta _I in the destination space A _A showing the shape of a virtual beam BI including. In the figure, as an example of the angle θ _I , only the angle θ _Ixy in the xy plane that is a horizontal plane, the angle θ _Ixz in the xz plane including the height direction, and the angle θ _Iyz in the yz plane including the height direction are only for the xz plane. Indicated. A rectangular parallelepiped the destination space A _A As shown in FIG. 11, when the communication device 91 in a rectangular vertex is positioned, the shape of the virtual beam BI is part of the smallest sphere containing the destination space A _A 1 / 8 spheres, and the angle θ _Ixy , the angle θ _Ixz, and the angle θ _Iyz are 90 °. Also a destination space _{A A} rectangular parallelepiped as shown in FIG. 12, when the communication device 91 located on the rectangular surface, the angle theta _Ixy is 360 °, the angle theta _Ixz and angle theta _Iyz is 180 °.

10 to 12 in the virtual beam BI shape is an example defined by the angle theta _I, but the present embodiment is not limited thereto. For example, assuming indoors, roads, etc., the virtual beam BI can be a polyhedron as shown in FIG. In this case, to be able to identify the shape of the destination space A _A, the shape of the virtual beam BI comprises one or more reference points P _R which is arranged in line or plane comprises the destination space A _A. When the virtual beam BI is a rectangular parallelepiped, the shape of the virtual beam BI is, for example, the coordinates of the reference point P _{R 2} points and sighting S _I.

The virtual beam determination unit 31, the shape may be the shape of a virtual beam BI as destination space A _A. Although the destination space A _A In FIGS. 11 to 13 is an example a rectangular parallelepiped (cube), the shape of the destination space A _A is optional. For example, it may be a cylinder, an elliptic cylinder, a sphere, or an elliptic sphere.

Further, the communication device 91 in FIGS. 11 to 13 showed an example in contact with the destination space A _A, the communication device 91 may be located in the destination space A _A. In this case, the sight S _I of the virtual beam BI and omnidirectional or ∞, it is preferable to span go uniformly just proportion in the destination space A _A. For example, the shape of the virtual beam BI may be defined by an angle theta _I, the shape of the virtual beam BI spherical. When the destination space A _A is within the reach of the antenna beam BA, the radius R _I of the sphere is preferably determined so that the virtual beam BI is the smallest sphere including the destination space A _A.

The virtual beam determination unit 31, the shape may be the shape of a virtual beam BI as destination space A _A. For example, when the shape of the virtual beam BI is a cube, the virtual beam BI shape identified using sight S _I and the coordinates of the reference point P _{R 2} points.

Note that FIG. 12 illustrates an example in which the communication device 91 that is the device itself is arranged at the center of the virtual beam BI. The position of the communication device 91 with respect to the virtual beam BI is arbitrary. In this case, similarly to FIG. 13, separately specify the reference point P _R to substitute the center point to the own device.

(Embodiment 3)
The communication device 91 according to the present embodiment transmits a frame to a destination direction corresponding to nodes located around the own device. FIG. 14 shows an example of a communication apparatus according to this embodiment. The communication device 91 according to the present embodiment includes a node detection unit 41. The node detection unit 41 detects a node 92 located around the communication device 91 that is its own device. The virtual beam determining unit 31 determines the aim S _I and the shape of the virtual beam based on the position of the node.

The node detection method is arbitrary. For example, the following can be illustrated.
(1) Use a normal frame. For example, each node includes the node ID of its own device in the frame. The position of the node may include the position of the transmission source (including the GPS value: latitude, longitude, and altitude) in the frame, may estimate the distance from the radio field intensity of the received frame, or may receive the received frame Information from an antenna that can estimate the direction of the signal may be used. The latest version may be used as the position, or an average value for a certain period may be used.

(2) Use information held by each link. For example, in WiFi, adjacent node information is held depending on the Beacon reception status, and the information is acquired and used.

(3) Use a frame for node detection. For example, each node periodically transmits a node detection frame, and detects neighboring nodes based on the reception status. The information included in the node detection frame is the same as the method (1).

15 and 16 show a first example and a second example of the virtual beam BI. In the first example of the virtual beam BI, the aiming S _I −1 and S _I −2 and the angles θ _I −1 and θ _I −2 of the virtual beam BI aligned with the position of the node 92 are set. In the second example of the virtual beam BI, the aim S _I and the angle θ _{I of} the virtual beam BI are matched to the spatial distribution of the nodes 92. The shape of the virtual beam BI is, for example, a shape that includes only a high-density region of the nodes 92.

FIG. 17 shows a third example of the virtual beam BI. In the third example of the virtual beam BI, the aim S _I and the angle θ _{I of} the virtual beam BI avoiding the transfer source node 93 are set. In this case, the virtual beam determination unit 31 determines whether the node detected by the node detection unit 41 includes the frame transfer source node 93, and the transfer source node 93 exists among the nodes. The shape of the virtual beam BI is determined so that the node 93 is not included in the region of the virtual beam BI. It can be expected to reduce wasteful radio wave emission, reduce power consumption, and avoid radio wave interference.

FIGS. 15 to 17 show a case where the shape of the virtual beam BI is an angle θ _I as shown in FIGS. 6 and 7 in which the spherical surface is cut directly around the own apparatus and the aim, but this embodiment is not limited to this. It is not limited. For example, as described in the second embodiment, a combination with another shape that is not a shape obtained by cutting off the spherical surface may be used.

Further, the destination direction of the virtual beam BI may be opposite the direction to the destination space A _A. When the node does not exist or when radio wave emission to the destination direction is not permitted, a detour can be found.

The virtual beam determination unit 31 selects one from among the detected node of the node detecting section 41 satisfies a predetermined condition, determining a sight S _I and the shape of the virtual beam BI to include only the selected node May be. The predetermined condition includes, for example, a method of managing past communication success levels and selecting only nodes with high communication success levels. In addition, there is a method of selecting only a node whose moving speed of each node 92 is slow. There is a method of selecting only a node having a large remaining battery level of each node 92. There is a method of selecting only a node having a low processing load on each node 92. There is a method of selecting only a node having a parameter such as a wireless channel that the communication apparatus 91 can handle. By selecting a node by these methods, the communication device 91 according to the present embodiment can transmit a frame to a node that can be transferred more reliably while suppressing radio wave interference.

(Embodiment 4)
The communication device 91 according to the present embodiment transmits a frame in a destination direction corresponding to the arrival direction of the frame. FIG. 18 shows an example of a communication apparatus according to this embodiment. The communication device 91 according to the present embodiment includes an arrival direction detection unit 42. When the receiving antenna 15 receives a frame, the arrival direction detection unit 42 detects the arrival direction from which the frame has arrived using the direction information from the direction detection unit 12. The virtual beam determination unit 31 determines the aim S _I and the shape of the virtual beam BI based on the arrival direction detected by the arrival direction detection unit 42.

When the receiving antenna 15 is arranged as 14A to 14D shown in FIG. 4 and only 14A receives the frame, the arrival direction detection unit 42 detects the direction of 14A as the arrival direction. Arrival direction may be a direction of the central angle C _A of 14A, or may be a direction of the entire range of the antenna beam BA.

19 to 21 show first to third examples of the virtual beam BI. In a first example of a virtual beam BI shown in FIG. 19, the virtual beam determination unit 31, the incoming direction to the position of the node 93 in the opposite direction, to determine the aim S _I of the virtual beam BI. Thereby, the relay effect is acquired. In the second example of the virtual beam BI illustrated in FIG. 20, the virtual beam determination unit 31 determines the range excluding the arrival direction in which the node 93 is located as the shape of the virtual beam BI. Thereby, the diffusion effect is obtained. In a third example of a virtual beam BI shown in FIG. 21, the virtual beam determination unit 31, the node 93 that was placed in the same horizontal plane perpendicular vertical plane directions, to determine the aim S _I of the virtual beam BI . Thereby, the relay surface can be changed.

(Embodiment 5)
The communication device 91 according to the present embodiment transmits a frame in a destination direction corresponding to the radio wave environment. FIG. 22 shows an example of a communication apparatus according to this embodiment. The communication device 91 according to the present embodiment includes a radio wave environment detection unit 44. The radio wave environment detection unit 44 grasps the radio wave usage status around the communication device 91 that is its own device. The virtual beam determination unit 31 determines the aim S _I and the shape of the virtual beam BI based on the radio wave environment detected by the radio wave environment detection unit 44.

FIG. 23 shows an example of the virtual beam BI. When there is a radio wave generation source 94 that uses the same frequency channel, the virtual beam determination unit 31 determines the aim S _I and the angle θ _I of the virtual beam BI so as not to include the radio wave generation source 94. The radio wave generation source 94 is not limited to a node, and may be the arrival direction of radio waves.

The virtual beam determination unit 31 may determine the aim S _I and the angle θ _I of the virtual beam BI so as to include the radio wave generation source 94 when the radio wave generation source exists in the destination direction. By transmitting toward the radio wave generation source, there is an effect of increasing the reception accuracy. In the case of transmitting to the direction of the radio wave generating source 94, the virtual beam narrowing the BI angle theta _I, by taking long distance D _I of the virtual beam BI, can be improved similarly reception accuracy.

(Embodiment 6)
The communication device 91 according to the present embodiment transmits a frame to a destination direction corresponding to the altitude of the own device. For example, the communication device 91 has the same configuration as that in FIG. 3, and the position detection unit 11 detects the altitude of the own device. The virtual beam determination unit 31 determines the aim S _I and the shape of the virtual beam based on the altitude of the device itself.

For example, when the position detecting unit 11 detects the altitude indicating that the in-flight, the virtual beam determination unit 31, a lower -90 ° shown in FIG. 5, to determine the aim S _I of the virtual beam BI. On the other hand, when the position detecting unit 11 detects the altitude indicating that the vehicle is traveling on the ground, the virtual beam determination unit 31, the horizontal 0 ° shown in FIG. 5, to determine the aim S _I of the virtual beam BI. Thereby, when located in the air, a frame can be transmitted toward the ground, and when it is on the ground, the frame can be transmitted toward the ground.

(Embodiment 7)
The communication device 91 according to the present embodiment transmits a frame in a destination direction corresponding to information around the device itself. FIG. 24 shows an example of a communication apparatus according to this embodiment. The communication device 91 according to this embodiment includes an information acquisition unit 45. The information acquisition unit 45 acquires information around the device itself. The virtual beam determination unit 31 determines the aim S _I and the shape of the virtual beam BI based on the information. The information around the device itself is, for example, map information or radio wave environment information.

FIG. 25 shows an example of the virtual beam BI. When there is an obstacle 95 that interferes with radio waves around the device itself, the virtual beam determination unit 31 determines the aim S _I and the angle θ _I of the virtual beam BI so as to avoid the obstacle 95. The obstacle 95 is, for example, a communication area of a structure such as a building or another communication system that shares radio waves. When the presence / absence of the obstacle 95 changes depending on the time, time information may be included as information around the device itself.

(Embodiment 8)
The communication device 91 according to the present embodiment transmits a frame to a destination direction and a range corresponding to the battery level of the device itself. For example, the communication device 91 has the same configuration as that in FIG. 3, and the virtual beam determination unit 31 acquires the remaining battery level of the own device. The virtual beam determination unit 31 determines the aim and shape of the virtual beam based on the remaining battery level of the device itself.

For example, when the battery remaining amount is large to widen the angle theta _I, if the battery level is low to narrow the angle theta _I. By narrowing the angle theta _I, it is possible to reduce the number of antennas to operate one of the transmit antennas 14A~14D shown in FIG. Thereby, power consumption can be reduced. If the antenna is capable of beam forming, the output power of the antenna can be suppressed when the range is narrowed, and the power consumption can be reduced. If the battery remaining amount is large to increase the distance D _I of the virtual beam BI, if the battery level is low it may shorten the distance D _I of the virtual beam BI.

(Embodiment 9)
The communication device 91 according to the present embodiment has a function for preventing infinite frame transfer. Hereinafter, a description will be given with reference to FIG. Figure 26 is a communication device frame transmitted from the communication device 91-1 that functions as an originating node, the communication device 91-4, and 91-5, is transferred by the communication apparatus 91-6 in the order, located in the destination space _{A A} The example received by 91-9 and 91-10 is shown.

  For example, the communication device 91 has the same configuration as that in FIG. 3, and the frame includes a storage period. In the communication device 91-1, the frame generation unit 33 includes the storage time limit in the frame. In the communication devices 91-4, 91-5, and 91-6, the reception processing unit 34 reads the storage deadline from the frame and outputs it to the virtual beam determination unit 31. In the communication devices 91-4, 91-5, 91-6, 91-9, and 91-10, the virtual beam determination unit 31 aims and shapes the virtual beam BI when the frame reception time is within the storage period. To decide. When the reception time of the frame has passed the storage deadline in the communication devices 91-9 and 91-10, the communication devices 91-9 and 91-10 do not transmit the frame. For this reason, infinite frame transfer can be prevented.

  For example, the communication device 91 has the same configuration as that in FIG. 3, and the frame includes a transmission position where the frame is generated. In the communication device 91-1, the frame generation unit 33 includes the position detected by the position detection unit 11 as a transmission position in the frame. In the communication devices 91-4, 91-5, 91-6, 91-9, and 91-10, the reception processing unit 34 reads the transmission position from the frame and outputs it to the virtual beam determination unit 31. In the communication devices 91-4, 91-5, 91-6, 91-9, and 91-10, the virtual beam determination unit 31 is within a range in which the geographical position acquired by the position detection unit 11 is set from the transmission position. In some cases, the aim and shape of the virtual beam BI is determined. For this set range, a predetermined threshold value may be used, or the threshold value may be changed according to the situation of the device itself. In the communication apparatuses 91-9 and 91-10, when the geographical position acquired by the position detection unit 11 is outside the range set from the transmission position, the communication apparatuses 91-9 and 91-10 do not transmit a frame. For this reason, infinite frame transfer can be prevented.

For example, a configuration similar to that of the communication device 91 of FIG. 3, the frame includes a destination space A _A. In the communication device 91-1, the frame generation unit 33 includes the destination space _AA in the frame. In the communication devices 91-4, 91-5, 91-6, 91-9, and 91-10, the reception processing unit 34 reads the destination space A _A from the frame and outputs it to the virtual beam determination unit 31. In the communication devices 91-4, 91-5, 91-6, 91-9, and 91-10, the virtual beam determination unit 31 sets the geographical position acquired by the position detection unit 11 with the destination space _AA as a base point. If so, the aim and shape of the virtual beam BI are determined. For this set range, a predetermined threshold value may be used, or the threshold value may be changed according to the situation of the device itself. When the geographical position acquired by the position detection unit 11 in the communication devices 91-9 and 91-10 is outside the range set with the destination space _AA as the base point, the communication devices 91-9 and 91-10 transmit frames. do not do. For this reason, infinite frame transfer can be prevented.

  For example, the communication device 91 has the same configuration as that in FIG. 3, and the frame includes the number of remaining hops. In the communication device 91-1, the frame generation unit 33 includes the number of remaining possible hops in the frame. In the communication devices 91-4, 91-5, 91-6, 91-9, and 91-10, the reception processing unit 34 reads the remaining hop count from the frame and outputs it to the virtual beam determination unit 31. In the communication apparatuses 91-4, 91-5, 91-6, 91-9, and 91-10, the virtual beam determination unit 31 determines the aim and shape of the virtual beam when the remaining possible hop count is 1 or more. . In the communication devices 91-4, 91-5, 91-6, 91-9, and 91-10, the antenna control unit 32 sends a frame in which the number of remaining hops included in the frame is reduced by 1 to the transmission antenna 14. Send it. When the number of remaining possible hops is less than 1 in the communication devices 91-9 and 91-10, the communication devices 91-9 and 91-10 do not transmit a frame. For this reason, infinite frame transfer can be prevented.

  For example, the communication device 91 further includes a distance calculation unit (not shown), and the frame includes a transfer path length. The transfer path length is a transfer path length from a transmission position, which is a frame generation point, to a transmission node. In the communication device 91-1, the frame generation unit 33 includes the position information acquired by the position detection unit 11 in the frame as the transfer path length. In the communication devices 91-4, 91-5, 91-6, 91-9, and 91-10, the reception processing unit 34 reads the transfer path length from the frame and outputs it to the virtual beam determination unit 31. In the communication devices 91-4, 91-5, 91-6, 91-9, 91-10, the distance calculation unit (not shown) from the transmission node that is the transmission source of the frame received by the reception antenna 15 to the own device. The distance is calculated. For example, the communication device 91-6 calculates the distance from the communication device 91-4 to the communication device 91-6. In the communication devices 91-4, 91-5, 91-6, 91-9, and 91-10, the virtual beam determination unit 31 adds the total distance calculated by the distance calculation unit (not shown) to the transfer path length. When the path length is within the set range, the aim and shape of the virtual beam are determined. Here, for the set range, a predetermined threshold value may be used, or the threshold value may be changed according to the situation of the device itself. In the communication devices 91-4, 91-5, 91-6, 91-9, and 91-10, the antenna control unit 32 transmits a frame in which the transfer path length included in the frame is updated to the total transfer path length as a transmission antenna. 14 to transmit the frame. When the total transfer path length obtained by adding the distance calculated by the distance calculation unit (not shown) in the communication apparatuses 91-9 and 91-10 to the transfer path length is equal to or larger than the set threshold value, the communication apparatuses 91-9 and 91-9 91-10 does not transmit a frame. For this reason, infinite frame transfer can be prevented.

(Embodiment 10)
The communication device 91 according to the present embodiment has a function for preventing unnecessary transfer. Hereinafter, a description will be given with reference to FIGS. 26 and 27. FIG.

  For example, the same frame is not transmitted more than once. The device configuration of the communication device 91 in this case is the same as that in FIG. As illustrated in FIG. 27, in the communication device 91-1, the frame generation unit 33 includes the node ID of its own device in the frame. In the communication devices 91-4, 91-5, 91-6, and 91-9, the virtual beam determination unit 31 determines the aim and shape of the virtual beam when the node ID of the own device is not included in the node ID. To do. On the other hand, in the communication devices 91-4, 91-5, 91-6, 91-9, the virtual beam determination unit 31 determines the aim and shape of the virtual beam when the node ID of the own device is included in the node ID. The signal is not output to the antenna control unit 32. For example, when the communication device 91-6 receives a frame from the communication device 91-9, the node ID of the own device is included in the node ID, so the communication device 91-6 does not transmit the frame. For this reason, unnecessary transfer can be prevented.

For example, the same frame is not transmitted more than once in the same direction. The device configuration of the communication device 91 in this case further includes a transmission history storage unit (not shown) in addition to the configuration of FIG. As illustrated in FIG. 26, in the communication device 91-1, the frame generation unit 33 includes the frame ID in the frame. In the communication devices 91-1, 91-4, 91-5, 91-6, 91-9, and 91-10, the transmission history storage unit (not shown) stored with aiming _{S a} and shape of BA. In the communication device 91-4,91-5,91-6,91-9,91-10, virtual beam determination unit 31, a frame ID the same frame ID and it is determined aiming _{S I} and the shape of the virtual beam BI It is checked whether or not it is stored in a transmission history storage unit (not shown). If it is stored, the aim and shape of the antenna beam having the same frame ID are read, and the aim and shape of the antenna beam are the aim of the virtual beam. And whether or not the shape overlaps. In the communication devices 91-4, 91-5, 91-6, 91-9, and 91-10, the virtual beam determination unit 31 stores the aim and shape of the virtual beam BI in a transmission history storage unit (not shown). If it does not overlap with the aim S _A and the shape of the antenna beam BA being used, the aim and shape of the virtual beam BI are determined. On the other hand, in the communication devices 91-4, 91-5, 91-6, 91-9, 91-10, the virtual beam determination unit 31 stores the aim and shape of the virtual beam BI in a transmission history storage unit (not shown). may overlap the optical sight S _a and the shape of which is an antenna beam BA, does not output the sighting and shape of the virtual beam BI to the antenna control unit 32. For example, determining at the communication device 91-6, when receiving the aiming S _A and the shape of the antenna beam BA stored in the transmission history storage unit (not shown) when receiving a frame from 91-4, a frame from 91-5 When the aiming and shape of the virtual beam BI overlapped, the communication device 91-6 does not transmit a frame. For this reason, unnecessary transfer can be prevented.

  For example, when a frame is transferred, if there are no nodes in the vicinity other than the node that has received the frame, the frame is not transmitted. The device configuration of the communication device 91 in this case is the same as that in FIG. As illustrated in FIG. 26, in the communication device 91-1, the frame generation unit 33 includes the node ID of its own device in the frame as the node ID of each communication device that has passed through the frame. In the communication devices 91-4, 91-5, 91-6, 91-9, and 91-10, the reception processing unit 34 reads the node ID from the frame and outputs it to the virtual beam determination unit 31. In the communication devices 91-4, 91-5, 91-6, 91-9, and 91-10, the virtual beam determination unit 31 detects the node detected by the node detection unit 41 in the node ID acquired from the reception processing unit 34. When all of the IDs are included, the aim and shape of the virtual beam BI are not output to the antenna control unit 32. For example, in the communication device 91-9, the node detection unit 41 detects the communication device 91-6, and the received frame includes all node IDs (91-6) of the communication device detected by the node detection unit 41. Therefore, the communication device 91-9 does not transmit a frame. For this reason, unnecessary transfer can be prevented.

  For example, the same frame is not returned to the transmission source. The device configuration of the communication device 91 in this case further includes a reception history storage unit (not shown) in addition to the configuration of FIG. As illustrated in FIG. 26, in the communication device 91-1, the frame generation unit 33 includes the node ID of its own device in the frame. In the communication devices 91-4, 91-5, 91-6, 91-9, 91-10, a reception history storage unit (not shown) stores the received frame ID and the node ID of the transmission node of the transmission source. In the communication devices 91-4, 91-5, 91-6, 91-9, 91-10, the virtual beam determination unit 31 refers to a reception history storage unit (not shown) and is associated with a frame ID. The ID is extracted from a reception history storage unit (not shown), the extracted node ID is compared with the node ID detected by the node detection unit 41, and all the node IDs detected by the node detection unit 41 are included in the extracted node ID. If so, the aim and shape of the virtual beam are not output to the antenna control unit 32. For example, in the communication device 91-9, when the node detection unit 41 detects the communication device 91-6 and receives a frame from 91-6, all the node IDs (91-6) detected by the node detection unit 41 are stored. Since it is included in the extracted node ID, the communication device 91-9 does not transmit a frame. For this reason, unnecessary transfer can be prevented.

(Embodiment 11)
The communication device 91 according to the present embodiment has a function for reducing inefficient transfer. Hereinafter, a description will be given with reference to FIGS.

  For example, the transfer is stopped with a certain probability according to the number of peripheral communication devices 91. The device configuration of the communication device 91 in this case is the same as that in FIG. As illustrated in FIG. 26, in the communication devices 91-4, 91-5, 91-6, 91-9, and 91-10, the node detection unit 41 outputs the detected number of communication nodes to the virtual beam determination unit 31. To do. For example, when the communication nodes detected by the communication device 91-4 are the communication devices 91-1, 91-2, 91-3, 91-5, 91-6, the number of detected communication nodes is 6 including the own device. It becomes a stand. In addition, when the communication nodes detected by the communication device 91-5 are 91-1, 91-4, 91-6, the number of detected communication nodes is four including the own device. The virtual beam determination unit 31 determines the aim and shape of the virtual beam with a probability corresponding to the number of nodes. When the number of nodes is large, the probability of stopping frame transfer is increased. For this reason, inefficient transfer can be reduced. For example, a method in which the probability of stopping the transfer is “1-1 / number of detected communication nodes” is conceivable. In the above example, the probability that the communication device 91-4 stops transferring is 1-1 / 6 = 5/6, and the probability that the communication device 91-5 stops transferring is 1-1 / 4 = 3/4. Is more likely to stop communication.

  For example, when attempting to transfer a frame, if a frame with a common frame ID is received again before actual transmission, the transfer is stopped. The device configuration of the communication device 91 in this case is the same as that in FIG. As illustrated in FIG. 28, in the communication devices 91-4, 91-5, 91-6, and 91-9, the reception processing unit 34 detects the time when the reception antenna 15 receives a frame, and the virtual beam determination unit 31. Output to. In the communication devices 91-4, 91-5, 91-6, and 91-9, the virtual beam determination unit 31 performs frame ID between the time when the receiving antenna 15 receives the frame and the time when the set standby time elapses. It is determined whether or not a common frame is received. If received, the aim and shape of the virtual beam BI are not output to the antenna control unit 32. For example, when the communication device 91-5 receives a frame from the communication device 91-4 between the time when the communication device 91-5 receives from the communication device 91-1 and the time when the standby time has elapsed, the virtual beam determination unit included in the communication device 91-5 31 does not output the aim and shape of the virtual beam BI to the antenna control unit 32.

  It is preferable to use it together with the control to set the standby time appropriately.For example, if the distance from the transmission node is short, the standby time is lengthened, and if the distance from the transmission node is long, the standby time is shortened. It will be possible to transfer to far away quickly. Also, when the battery level is low, when the calculation load is large, or when the movement speed is high, the standby time is lengthened. When the battery level is high, when the calculation load is low, or when the movement speed is low, the standby time is set. There is also a method of shortening.

For example, stop the transfer if different from the azimuth of the destination space A _A certain level. The device configuration of the communication device 91 in this case is the same as that in FIG. As illustrated in FIG. 26, in the communication device 91-1, the frame generation unit 33 includes the destination space _AA in the frame. In the communication devices 91-4, 91-5, 91-6, 91-9 and 91-10, the virtual beam determination unit 31 includes the aim S _I of the virtual beam BI and the destination direction to the destination space A _A for the own device. When the difference between the values exceeds the set range, the aim S _I and the shape of the virtual beam BI are not output to the antenna control unit 32. For this set range, a predetermined threshold value may be used, or the threshold value may be changed according to the situation of the device itself. This is effective in applications such as radar where detouring is not desirable.

  The present invention can be applied to the information communication industry.

11: Position detection unit 12: Direction detection unit 14: Transmission antenna 15: Reception antenna 31: Virtual beam determination unit 32: Antenna control unit 33: Frame generation unit 34: Reception processing unit 41: Node detection unit 42: Arrival direction detection unit 44: Radio wave environment detection unit 45: Information acquisition unit 91, 91-1, 91-2, 91-3, 91-4, 91-5, 91-6, 91-7, 91-8, 91-9, 91 −10, 91-N: Communication device 92: Node 93: Transfer source node 94: Radio wave generation source 95: Obstacle

Claims (23)

A position detector that acquires the absolute geographical position of the device;
A direction detection unit for detecting the direction;
A virtual beam determination unit that determines the aim and shape of a virtual beam that is an ideal beam radiated from an antenna, using the geographical position acquired by the position detection unit and the direction detected by the direction detection unit;
An antenna control unit for transmitting an antenna beam having an aim and a shape according to the virtual beam to the antenna;
A transmission apparatus comprising: The virtual beam determining unit determines the aim and shape of the virtual beam based on a destination space indicating a destination of the signal;
The transmission device according to claim 1. The virtual beam determination unit further includes:
Distance or number of hops from the origination position where the destination space is determined to the own device,
Elapsed time from the transmission time when the destination space is determined to the current time,
The distance or the number of hops from the destination space to the own device, or
The remaining time from the current time to a preset time limit,
Determining the aim and shape of the virtual beam based on at least one of:
The transmission device according to claim 1 or 2. A node detector for detecting nodes located around the device itself;
The virtual beam determination unit determines the aim and shape of the virtual beam based on the position of the node detected by the node detection unit;
The transmission device according to claim 1. When the antenna receives a signal, the antenna includes an arrival direction detection unit that detects an arrival direction in which the signal has arrived using a detection result of the direction detection unit,
The virtual beam determination unit determines the aim and shape of the virtual beam based on the arrival direction detected by the arrival direction detection unit.
The transmission device according to claim 1. Equipped with a radio wave environment detection unit that detects the radio wave environment used by its own device,
The virtual beam determination unit determines the aim and shape of the virtual beam based on the radio wave environment detected by the radio wave environment detection unit;
The transmission device according to claim 1. The virtual beam determination unit determines the aim and shape of the virtual beam based on the altitude of the device itself.
The transmission device according to claim 1. The virtual beam determination unit obtains information around the device itself, and determines the aim and shape of the virtual beam based on the information.
The transmission device according to claim 1. The virtual beam determination unit determines the aim and shape of the virtual beam based on the battery level of the device itself.
The transmission device according to claim 1. The signal received by the antenna includes an expiration date,
The virtual beam determination unit determines the aim and shape of the virtual beam when the reception time of the signal is within the storage period;
The transmission device according to claim 1. The signal received by the antenna includes the transmission position that is the signal generation point,
The virtual beam determination unit determines the aim and shape of the virtual beam when the geographical position acquired by the position detection unit is within a range set from the transmission position.
The transmission device according to claim 1. The signal received by the antenna includes a destination space indicating the destination of the signal,
The virtual beam determination unit determines the aim and shape of the virtual beam when the geographical position acquired by the position detection unit is within a range set with the destination space as a base point;
The transmission device according to claim 1. The signal received by the antenna contains the number of remaining hops,
The virtual beam determination unit determines the aim and shape of the virtual beam when the remaining possible hop count is 1 or more,
The antenna control unit causes the antenna to transmit a signal in which the number of remaining possible hops included in the signal is reduced by one.
The transmission device according to claim 1. A distance calculation unit that calculates a distance from a transmission node that is a transmission source of the signal received by the antenna to the own device;
The signal received by the antenna includes a transfer path length from the transmission position that is the generation point of the signal to the transmission node,
The virtual beam determination unit determines the aim and shape of the virtual beam when the total transfer path length obtained by adding the distance calculated by the distance calculation unit to the transfer path length is within a set range;
The antenna control unit causes the antenna to transmit a signal in which the transfer path length included in the signal is updated to the total transfer path length.
The transmission device according to claim 1. The signal received by the antenna includes identification information of each node through which the signal has passed,
The virtual beam determination unit does not output the aim and shape of the virtual beam to the antenna control unit when the identification information of the device itself is included in the identification information.
The transmission device according to claim 1. A node detector for detecting nodes located around the device itself;
The signal received by the antenna includes identification information of each node through which the signal has passed,
The virtual beam determination unit does not output the aim and shape of the virtual beam to the antenna control unit when all of the identification information of the node detected by the node detection unit is included in the identification information,
The transmission device according to any one of claims 1 to 15. The signal received by the antenna includes signal identification information;
A transmission history storage unit that stores the transmission history of the signal transmitted by the device itself together with the aim and shape of the antenna beam of the signal;
The virtual beam determination unit stores the same signal as the signal for determining the aim and shape of the virtual beam in the transmission history storage unit, and aims the antenna beam stored in the transmission history storage unit And the shape and shape of the virtual beam overlap with the aim and shape of the virtual beam, do not output the aim and shape of the virtual beam to the antenna control unit,
The transmission device according to claim 1. The signal received by the antenna includes signal identification information;
A node detector for detecting nodes located around the device itself;
A reception history storage unit for storing a reception history of signals at each node detected by the node detection unit;
With
The virtual beam determining unit obtains, from the reception history storage unit, a node that has received the same signal as the signal that determines the aim and shape of the virtual beam, and all the nodes detected by the node detecting unit are acquired as the acquired nodes. Is included, do not output the aim and shape of the virtual beam to the antenna control unit,
The transmission device according to claim 1. A node detector for detecting nodes located around the device itself;
The virtual beam determination unit determines the aim and shape of the virtual beam with a probability according to the number of nodes detected by the node detection unit;
The transmission device according to claim 1. When the antenna receives the same signal between the time when the antenna receives the signal and the time when the set standby time has elapsed, the virtual beam determining unit determines the aim and shape of the virtual beam when the antenna receives the same signal. Output to
The transmission device according to any one of claims 1 to 19. The signal received by the antenna includes a destination space indicating the destination of the signal,
The virtual beam determination unit does not output the aim and shape of the virtual beam to the antenna control unit when the difference between the aim of the virtual beam and the direction to the destination space with respect to the own device exceeds a set range.
The transmission device according to any one of claims 1 to 20. A position detecting step for obtaining an absolute geographical position of the device;
A direction detecting step for detecting a direction;
A virtual beam determining step for determining the aim and shape of a virtual beam, which is an ideal beam radiated from an antenna, using the geographical position acquired in the position detecting step and the direction detected in the direction detecting step;
An antenna control step of causing the antenna to transmit an antenna beam having an aim and a shape corresponding to the virtual beam;
A transmission method comprising:   The transmission program for making a computer perform each step of Claim 22.

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