Communication terminal, base station, communication system, communication control method, and program

Abstract

To provide a communication terminal capable of shortening the time required to set antenna directivity to a setting suitable for communication.SOLUTION: A communication terminal (1) includes an information acquisition unit (12) that controls the directivity of an antenna unit (11) to a first directivity and acquires information indicating the position of a base station from the base station, and a communication control unit (13) that controls the directivity to a second directivity narrower than the first directivity and communicates with the base station. The communication control unit (13) determines the second directivity based on the relative positions of the base station and the communication terminal (1) and the moving speed of the communication terminal (1).SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a communication terminal, a base station, a communication system, a communication control method, and a program. [Background technology]

[0002] There is known a technique in which a terminal equipped with an antenna whose directivity can be controlled communicates with a base station while changing the directivity.

[0003] For example, Patent Document 1 discloses a wireless communication device that narrows down the number of wireless communication terminals that can respond by gradually narrowing the antenna directivity from a wide range. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2003-188886 A Summary of the Invention [Problem to be solved by the invention]

[0005] The wireless communication device described in Patent Document 1 gradually narrows the antenna directivity. Therefore, in the wireless communication device, after communication with a wireless communication terminal is established, it takes time to set the antenna directivity to a high communication speed without disconnecting the communication with the wireless communication terminal. In other words, there is a problem in that it takes time for the antenna directivity of the communication terminal to be set to a setting suitable for communication.

[0006] The present disclosure has been made in consideration of the above problems, and an exemplary objective thereof is to provide a technique for shortening the time required for the antenna directivity of a communication terminal to be set to a setting suitable for communication. [Means for solving the problem]

[0007] A communication terminal device according to an exemplary aspect of the present disclosure includes an antenna unit having controllable directivity, an information acquisition means for controlling the directivity of the antenna unit to a first directivity and acquiring information indicating a position of the base station from the base station via the antenna unit, and a communication control means for controlling the directivity of the antenna unit to a second directivity narrower than the first directivity and communicating with the base station via the antenna unit, wherein the communication control means determines the second directivity based on a relative position between the base station and the communication terminal based on the information and a moving speed of the communication terminal.

[0008] A base station according to an exemplary aspect of the present disclosure comprises an information acquisition means for acquiring, from a communication terminal having an antenna unit capable of controlling directivity, information indicating a first directivity of the antenna unit, a position of the communication terminal, and a moving speed of the communication terminal when the communication terminal is communicating with the base station, and an instruction means for controlling the directivity of the antenna unit to a second directivity narrower than the first directivity, and instructing the communication terminal to communicate with the base station via the antenna unit, wherein the instruction means determines the second directivity based on the relative position between the base station and the communication terminal based on the information, and the moving speed of the communication terminal.

[0009] A communication system according to an exemplary aspect of the present disclosure is a communication system including a communication terminal and a base station, wherein the communication terminal includes an antenna unit having controllable directivity, an information acquisition means for controlling the directivity of the antenna unit to a first directivity and acquiring information indicating a position of the base station from the base station via the antenna unit, and a communication control means for controlling the directivity of the antenna unit to a second directivity narrower than the first directivity and communicating with the base station via the antenna unit, wherein the communication control means determines the second directivity based on a relative position between the base station and the communication terminal based on the information and a moving speed of the communication terminal, and the base station includes an information output means for outputting information indicating the position of the base station to the communication terminal.

[0010] A communication system according to an exemplary aspect of the present disclosure is a communication system including a communication terminal and a base station, wherein the communication terminal includes an antenna unit capable of controlling directivity, an information output means for outputting information indicating a first directivity of the antenna unit, a position of the communication terminal, and a moving speed of the communication terminal when the communication terminal is communicating with the base station, to the base station, a reception means for receiving instructions from the base station, and a communication control means for controlling the directivity of the antenna unit in accordance with the instructions and communicating with the base station via the antenna unit, wherein the base station includes an information acquisition means for acquiring the information from the communication terminal, and an instruction means for instructing the communication terminal to control the directivity of the antenna unit to a second directivity narrower than the first directivity and communicate with the base station via the antenna unit, and the instruction means determines the second directivity based on the relative position of the base station and the communication terminal based on the information, and the moving speed of the communication terminal.

[0011] A communication control method according to an exemplary aspect of the present disclosure includes a communication terminal having an antenna unit with controllable directivity controlling the directivity of the antenna unit to a first directivity and acquiring information indicating a position of the base station from the base station via the antenna unit, and controlling the directivity of the antenna unit to a second directivity narrower than the first directivity and communicating with the base station via the antenna unit, wherein in communicating, the second directivity is determined based on a relative position between the base station and the communication terminal based on the information and a moving speed of the communication terminal.

[0012] A program according to an exemplary aspect of the present disclosure causes a computer to execute an information acquisition process of controlling a directivity of an antenna unit to a first directivity and acquiring information indicating a position of the base station from a base station via the antenna unit, and a communication control process of controlling the directivity of the antenna unit to a second directivity narrower than the first directivity and communicating with the base station via the antenna unit, and in the communication control process, determines the second directivity based on a relative position between the base station and the communication terminal based on the information and on a moving speed of the communication terminal. Effect of the Invention

[0013] According to an exemplary aspect of the present disclosure, an exemplary effect is achieved in that the time required to set the antenna directivity of a communication terminal to a setting suitable for communication can be shortened. [Brief description of the drawings]

[0014] [Figure 1] 1 is a block diagram showing a configuration of a communication terminal according to the present disclosure. [Diagram 2] 1 is a flow diagram showing the flow of a communication control method according to the present disclosure. [Diagram 3] FIG. 2 is a block diagram showing a configuration of a base station according to the present disclosure. [Figure 4] 1 is a flow diagram showing the flow of a communication control method according to the present disclosure. [Diagram 5] 1 is a block diagram showing a configuration of a communication system according to the present disclosure. [Figure 6] 1 is a flow diagram showing the flow of a communication control method according to the present disclosure. [Figure 7] 1 is a block diagram showing a configuration of a communication system according to the present disclosure. [Figure 8] 1 is a flow diagram showing the flow of a communication control method according to the present disclosure. [Figure 9] 1 is a block diagram showing a configuration of a communication system according to the present disclosure. [Figure 10] FIG. 1 is a diagram illustrating an example of a communication method in a communication system according to the present disclosure. [Figure 11] 1 is a flow diagram showing the flow of a communication control method according to the present disclosure. [Figure 12] 1 is a block diagram showing a configuration of a communication system according to the present disclosure. [Figure 13] FIG. 1 is a diagram illustrating an example of a communication method in a communication system according to the present disclosure. [Figure 14] 1 is a flow diagram showing the flow of a communication control method according to the present disclosure. [Figure 15]1 is a block diagram showing a configuration of a computer functioning as a communication terminal and a base station according to the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] The following are examples of embodiments of the present invention. However, the present invention is not limited to the exemplary embodiments shown below, and various modifications are possible within the scope of the claims. For example, an embodiment obtained by appropriately combining the technical means employed in each of the exemplary embodiments shown below may also be included in the scope of the present invention. In addition, an embodiment obtained by appropriately omitting a part of the technical means employed in each of the exemplary embodiments shown below may also be included in the scope of the present invention. In addition, the effects mentioned in each of the exemplary embodiments shown below are examples of effects expected in the exemplary embodiments, and do not define the scope of the present invention. In other words, an embodiment that does not exhibit the effects mentioned in each of the exemplary embodiments shown below may also be included in the scope of the present invention.

[0016] First Exemplary Embodiment A first exemplary embodiment, which is an example of an embodiment of the present invention, will be described in detail with reference to the drawings. This exemplary embodiment is the basic form of each exemplary embodiment described later. The scope of application of each technical means adopted in this exemplary embodiment is not limited to this exemplary embodiment. That is, each technical means adopted in this exemplary embodiment can be adopted in other exemplary embodiments included in this disclosure to the extent that no particular technical obstacle occurs. In addition, each technical means shown in the drawings referred to for explaining this exemplary embodiment can also be adopted in other exemplary embodiments included in this disclosure to the extent that no particular technical obstacle occurs.

[0017] (Configuration of communication terminal 1) The configuration of the communication terminal 1 will be described with reference to Fig. 1. Fig. 1 is a block diagram showing the configuration of the communication terminal 1. As shown in Fig. 1, the communication terminal 1 includes an antenna unit 11, an information acquisition unit 12, and a communication control unit 13. The information acquisition unit 12 and the communication control unit 13 are components that respectively realize an information acquisition means and a communication control means in this exemplary embodiment.

[0018] The antenna unit 11 includes one or more antennas and is configured so that the directivity can be controlled. As an example, the antenna unit 11 is a multi-element antenna.

[0019] The information acquisition unit 12 controls the directivity of the antenna unit 11 to a first directivity, and acquires information indicating the position of the base station from the base station via the antenna unit 11. The first directivity is not limited, but an example thereof is the widest directivity among directivities capable of establishing communication with the base station.

[0020] The communication control unit 13 controls the directivity of the antenna unit 11 to a second directivity narrower than the first directivity, and communicates with the base station via the antenna unit 11. Specifically, the communication control unit 13 determines the second directivity based on the relative position between the base station and the communication terminal 1 based on the information acquired by the information acquisition unit 12, and the moving speed of the communication terminal 1. For example, the communication control unit 13 may determine the main direction of the second directivity to be the direction from the communication terminal 1 corresponding to the above-mentioned relative position to the base station. In addition, the communication control unit 13 may determine the width of the second directivity (for example, the beam half width) to be the narrowest allowable directivity among the directivities that are narrower than the first directivity and can establish communication with the base station taking into account the moving speed of the communication terminal 1. For example, the second directivity may be narrowed as the moving speed of the communication terminal 1 is slower.

[0021] (Effect of communication terminal 1) As described above, the communication terminal 1 is configured to include an antenna unit 11 capable of controlling directivity, an information acquisition unit 12 that controls the directivity of the antenna unit 11 to a first directivity and acquires information indicating the position of the base station from the base station via the antenna unit 11, and a communication control unit 13 that controls the directivity of the antenna unit 11 to a second directivity narrower than the first directivity and communicates with the base station via the antenna unit 11. The communication control unit 13 determines the second directivity based on the relative position between the base station and the communication terminal 1 based on the information acquired by the information acquisition unit 12 and the moving speed of the communication terminal. Therefore, the communication terminal 1 has an effect of shortening the time required to set the antenna directivity to a setting suitable for communication.

[0022] (Flow of communication control method S1) The flow of a communication control method S1 executed by a communication terminal 1 having an antenna unit 11 capable of controlling directivity will be described with reference to Fig. 2. Fig. 2 is a flow diagram showing the flow of the communication control method S1. As shown in Fig. 2, the communication control method S1 includes an information acquisition process S11 and a communication control process S12.

[0023] (Step S11) In step S11, the information acquisition unit 12 controls the directivity of the antenna unit 11 to a first directivity, and acquires, from the base station via the antenna unit 11, information indicating the position of the base station.

[0024] (Step S12) In step S12, the communication control unit 13 controls the directivity of the antenna unit 11 to a second directivity narrower than the first directivity, and communicates with the base station via the antenna unit 11. Specifically, in step S12, the communication control unit 13 determines the second directivity based on the relative position between the base station and the communication terminal 1 based on the information acquired by the information acquisition unit 12, and the moving speed of the communication terminal.

[0025] (Effects of communication control method S1) As described above, the communication control method S1 executed by the communication terminal 1 having the antenna unit 11 capable of controlling the directivity includes a step S11 in which the information acquisition unit 12 controls the directivity of the antenna unit 11 to a first directivity and acquires information indicating the position of the base station from the base station via the antenna unit 11, and a step S12 in which the communication control unit 13 controls the directivity of the antenna unit 11 to a second directivity narrower than the first directivity and communicates with the base station via the antenna unit 11. In addition, in step S12, the communication control unit 13 determines the second directivity based on the relative position between the base station and the communication terminal 1 based on the information acquired by the information acquisition unit 12 and the moving speed of the communication terminal. Therefore, according to the communication control method S1, the same effect as that of the above-mentioned communication terminal 1 can be obtained.

[0026] (Configuration of base station 2) The configuration of the base station 2 will be described with reference to Fig. 3. Fig. 3 is a block diagram showing the configuration of the base station 2. As shown in Fig. 3, the base station 2 includes an information acquisition unit 21 and an instruction unit 22. The information acquisition unit 21 and the instruction unit 22 are components that respectively realize an information acquisition means and an instruction means in this exemplary embodiment.

[0027] The information acquisition unit 21 acquires, from a communication terminal equipped with an antenna unit whose directivity can be controlled, information indicating a first directivity of the antenna unit, the position of the communication terminal, and the moving speed of the communication terminal when the communication terminal is communicating with a base station 2.

[0028] The instruction unit 22 controls the directivity of the antenna unit of the communication terminal to a second directivity narrower than the first directivity, and instructs the communication terminal to communicate with the base station 2 via the antenna unit. Specifically, the instruction unit 22 determines the second directivity based on the relative position between the base station 2 and the communication terminal based on the information acquired by the information acquisition unit 21, and the moving speed of the communication terminal.

[0029] (Effect of base station 2) As described above, the base station 2 is configured to include an information acquisition unit 21 that acquires information indicating a first directivity of the antenna unit, a position of the communication terminal, and a moving speed of the communication terminal when the communication terminal is communicating with the base station 2 from a communication terminal equipped with an antenna unit capable of controlling directivity, and an instruction unit 22 that controls the directivity of the antenna unit to a second directivity narrower than the first directivity, and instructs the communication terminal to communicate with the base station 2 via the antenna unit. The instruction unit 22 determines the second directivity based on the relative position between the base station 2 and the communication terminal based on the information acquired by the information acquisition unit 21, and the moving speed of the communication terminal. Therefore, the base station 2 can obtain the same effect as the above-mentioned communication terminal 1.

[0030] (Flow of communication control method S2) The flow of the communication control method S2 executed by the base station will be described with reference to Fig. 4. Fig. 4 is a flow diagram showing the flow of the communication control method S2. As shown in Fig. 4, the communication control method S2 includes an information acquisition process S21 and an instruction process S22.

[0031] (Step S21) In step S21, the information acquisition unit 21 acquires information from a communication terminal equipped with an antenna unit whose directivity can be controlled, indicating a first directivity of the antenna unit, the position of the communication terminal, and the moving speed of the communication terminal when the communication terminal is communicating with a base station 2.

[0032] (Step S22) In step S22, the instruction unit 22 controls the directivity of the antenna unit to a second directivity narrower than the first directivity, and instructs the communication terminal to communicate with the base station 2 via the antenna unit. Specifically, in step S22, the instruction unit 22 determines the second directivity based on the relative position between the base station 2 and the communication terminal based on the information acquired by the information acquisition unit 21, and the moving speed of the communication terminal.

[0033] (Effects of communication control method S2) As described above, the communication control method S2 includes a step S21 in which the information acquisition unit 21 acquires information indicating a first directivity of the antenna unit, a position of the communication terminal, and a moving speed of the communication terminal when the communication terminal is communicating with the base station 2 from a communication terminal equipped with an antenna unit capable of controlling directivity, and a step S22 in which the instruction unit 22 controls the directivity of the antenna unit to a second directivity narrower than the first directivity, and instructs the communication terminal to communicate with the base station 2 via the antenna unit. In addition, in step S22, the instruction unit 22 determines the second directivity based on the relative position between the base station 2 and the communication terminal based on the information acquired by the information acquisition unit 21, and the moving speed of the communication terminal. Therefore, according to the communication control method S2, the same effect as that of the above-mentioned communication terminal 1 can be obtained.

[0034] (Configuration of communication system 100) The configuration of the communication system 100 will be described with reference to Fig. 5. Fig. 5 is a block diagram showing the configuration of the communication system 100. As shown in Fig. 5, the communication system 100 includes a communication terminal 3 and a base station 4.

[0035] 5, the communication terminal 3 includes an antenna unit 31, an information acquisition unit 32, and a communication control unit 33. In this exemplary embodiment, the information acquisition unit 32 and the communication control unit 33 are components that respectively realize an information acquisition means and a communication control means.

[0036] The antenna unit 31 is an antenna whose directivity can be controlled.

[0037] The information acquisition unit 32 controls the directivity to a first directivity, and acquires information indicating the position of the base station 4 from the base station 4 via the antenna unit 31.

[0038] The communication control unit 33 controls the directivity of the antenna unit 31 to a second directivity narrower than the first directivity, and communicates with the base station 4 via the antenna unit 31. Specifically, the communication control unit 33 determines the second directivity based on the relative positions between the base station 4 and the communication terminal 3 based on the information acquired by the information acquisition unit 32, and the moving speed of the communication terminal 3.

[0039] 5, the base station 4 includes an information output unit 41. The information output unit 41 is configured to realize information output means in this exemplary embodiment.

[0040] The information output unit 41 outputs information indicating the position of the base station 4 to the communication terminal 3 .

[0041] (Effects of the communication system 100) As described above, the communication system 100 employs a configuration including the communication terminal 3 and the base station 4.

[0042] The communication terminal 3 is configured to include an antenna unit 31 capable of controlling directivity, an information acquisition unit 32 that controls the directivity of the antenna unit 31 to a first directivity and acquires information indicating the position of the base station 4 from the base station 4 via the antenna unit 31, and a communication control unit 33 that controls the directivity of the antenna unit 31 to a second directivity narrower than the first directivity and communicates with the base station 4 via the antenna unit 31. The communication control unit 33 determines the second directivity based on the relative position between the base station 4 and the communication terminal 3 based on the information acquired by the information acquisition unit 32 and the moving speed of the communication terminal 3.

[0043] The base station 4 employs a configuration including an information output unit 41 that outputs information indicating the position of the base station 4 to the communication terminal 3.

[0044] Therefore, according to the communication system 100, the same effects as those of the above-mentioned communication terminal 1 can be obtained.

[0045] (Flow of communication control method S100) The flow of the communication control method S100 will be described with reference to Fig. 6. Fig. 6 is a flow diagram showing the flow of the communication control method S100. As shown in Fig. 6, the communication control method S100 includes an information output process S101, an information acquisition process S102, and a communication control process S103.

[0046] (Step S101) In step S 101 , the information output unit 41 of the base station 4 outputs information indicating the position of the base station 4 to the communication terminal 3 .

[0047] (Step S102) In step S102, the information acquisition unit 32 of the communication terminal 3 equipped with an antenna unit 31 whose directivity is controllable controls the directivity of the antenna unit 31 to a first directivity and acquires information indicating the position of the base station 4 from the base station 4 via the antenna unit 31.

[0048] (Step S103) In step S103, the communication control unit 33 controls the directivity of the antenna unit 31 to a second directivity narrower than the first directivity, and communicates with the base station 4 via the antenna unit 31. Specifically, in step S103, the communication control unit 33 determines the second directivity based on the relative positions between the base station 4 and the communication terminal 3 based on the information acquired by the information acquisition unit 32, and the moving speed of the communication terminal 3.

[0049] (Effects of communication control method S100) As described above, the communication control method S100 employs a configuration including step S101 in which the information output unit 41 of the base station 4 outputs information indicating the position of the base station 4 to the communication terminal 3.

[0050] Moreover, the communication control method S100 employs a configuration including a step S102 in which an information acquisition unit 32 of a communication terminal 3 equipped with an antenna unit 31 capable of controlling directivity controls the directivity of the antenna unit 31 to a first directivity and acquires information indicating the position of the base station 4 from the base station 4 via the antenna unit 31, and a step S103 in which a communication control unit 33 controls the directivity of the antenna unit 31 to a second directivity narrower than the first directivity and communicates with the base station 4 via the antenna unit 31. Furthermore, in step S103, the communication control unit 33 determines the second directivity based on the relative position between the base station 4 and the communication terminal 3 based on the information acquired by the information acquisition unit 32 and the movement speed of the communication terminal 3.

[0051] Therefore, according to the communication control method S100, the same effects as those of the above-mentioned communication terminal 1 can be obtained.

[0052] (Configuration of communication system 200) The configuration of the communication system 200 will be described with reference to Fig. 7. Fig. 7 is a block diagram showing the configuration of the communication system 200. As shown in Fig. 7, the communication system 200 includes a communication terminal 5 and a base station 6.

[0053] 7, the communication terminal 5 includes an antenna unit 51, an information output unit 52, a reception unit 53, and a communication control unit 54. In this exemplary embodiment, the information output unit 52, the reception unit 53, and the communication control unit 54 are components that respectively realize an information output means, a reception means, and a communication control means.

[0054] The antenna unit 51 is an antenna whose directivity can be controlled.

[0055] The information output unit 52 outputs to the base station 6 information indicating the first directivity of the antenna unit 51, the position of the communication terminal 5, and the moving speed of the communication terminal 5 when the communication terminal 5 is communicating with the base station 6.

[0056] The reception unit 53 receives an instruction from the base station 6 .

[0057] The communication control unit 54 controls the directivity of the antenna unit 51 in accordance with the instruction received by the receiving unit 53 , and communicates with the base station 6 via the antenna unit 51 .

[0058] 7, the base station 6 includes an information acquisition unit 61 and an instruction unit 62. The information acquisition unit 61 and the instruction unit 62 are components that respectively realize an information acquisition means and an instruction means in this exemplary embodiment.

[0059] The information acquisition unit 61 acquires, from the communication terminal 5, information indicating the first directivity, the position of the communication terminal 5, and the moving speed of the communication terminal 5.

[0060] The instruction unit 62 controls the directivity of the antenna unit 51 to a second directivity narrower than the first directivity, and instructs the communication terminal 5 to communicate with the base station 6 via the antenna unit 51. Specifically, the instruction unit 62 determines the second directivity based on the relative positions of the base station 6 and the communication terminal 5 based on the information acquired by the information acquisition unit 61, and the moving speed of the communication terminal 5.

[0061] (Effects of communication system 200) As described above, the communication system 200 employs a configuration including the communication terminal 5 and the base station 6.

[0062] The communication terminal 5 is configured to include an antenna unit 51 capable of controlling directivity, an information output unit 52 that outputs information indicating a first directivity of the antenna unit 51, the position of the communication terminal 5, and the moving speed of the communication terminal 5 to the base station 6 when the communication terminal 5 is communicating with the base station 6, a reception unit 53 that receives instructions from the base station 6, and a communication control unit 54 that controls the directivity of the antenna unit 51 in accordance with the instructions received by the reception unit 53 and communicates with the base station 6 via the antenna unit 51.

[0063] The base station 6 is configured to include an information acquisition unit 61 that acquires information indicating a first directivity, the position of the communication terminal 5, and the moving speed of the communication terminal 5 from the communication terminal 5, and an instruction unit 62 that controls the directivity of the antenna unit 51 to a second directivity narrower than the first directivity, and instructs the communication terminal 5 to communicate with the base station 6 via the antenna unit 51. The instruction unit 62 determines the second directivity based on the relative position between the base station 6 and the communication terminal 5 based on the information acquired by the information acquisition unit 61, and the moving speed of the communication terminal 5.

[0064] Therefore, according to the communication system 200, the same effects as those of the above-mentioned communication terminal 1 can be obtained.

[0065] (Flow of communication control method S200) The flow of the communication control method S200 will be described with reference to Fig. 8. Fig. 8 is a flow diagram showing the flow of the communication control method S200. As shown in Fig. 8, the communication control method S200 includes an information output process S201, an information acquisition process S202, an instruction process S203, a reception process S204, and a communication control process S205.

[0066] (Step S201) In step S201, the information output unit 52 of the communication terminal 5 whose directivity is controllable outputs to the base station 6 information indicating the first directivity of the antenna unit 51, the position of the communication terminal 5, and the moving speed of the communication terminal 5 when the communication terminal 5 is communicating with the base station 6.

[0067] (Step S202) In step S202, the information acquisition unit 61 of the base station 6 acquires, from the communication terminal 5, information indicating the first directivity, the position of the communication terminal 5, and the moving speed of the communication terminal 5.

[0068] (Step S203) In step S203, the instruction unit 62 controls the directivity of the antenna unit 51 to a second directivity narrower than the first directivity, and instructs the communication terminal 5 to communicate with the base station 6 via the antenna unit 51. Specifically, in step S203, the instruction unit 62 determines the second directivity based on the relative positions of the base station 6 and the communication terminal 5 based on the information acquired by the information acquisition unit 61, and the moving speed of the communication terminal 5.

[0069] (Step S204) In step S204, the reception unit 53 receives an instruction from the base station 6.

[0070] (Step S205) In step S 205 , the communication control unit 54 controls the directivity of the antenna unit 51 in accordance with the instruction received by the receiving unit 53 , and communicates with the base station 6 via the antenna unit 51 .

[0071] (Effects of the communication control method S200) As described above, the communication control method S200 employs a configuration including a step S201 in which the information output unit 52 of the communication terminal 5 capable of controlling directivity outputs to the base station 6 information indicating the first directivity of the antenna unit 51, the position of the communication terminal 5, and the moving speed of the communication terminal 5 when the communication terminal 5 is communicating with the base station 6.

[0072] Moreover, the communication control method S200 employs a configuration including step S202 in which the information acquisition unit 61 of the base station 6 acquires information indicating a first directivity, a position of the communication terminal 5, and a moving speed of the communication terminal 5 from the communication terminal 5, and step S203 in which the instruction unit 62 controls the directivity of the antenna unit 51 to a second directivity narrower than the first directivity, and instructs the communication terminal 5 to communicate with the base station 6 via the antenna unit 51. Furthermore, in step S203, the instruction unit 62 determines the second directivity based on the relative position between the base station 6 and the communication terminal 5 based on the information acquired by the information acquisition unit 61, and the moving speed of the communication terminal 5.

[0073] In addition, the communication control method S200 employs a configuration including a step S204 in which the reception unit 53 of the communication terminal 5 receives instructions from the base station 6, and a step S205 in which the communication control unit 54 controls the directivity of the antenna unit 51 in accordance with the instructions received by the reception unit 53, and communicates with the base station 6 via the antenna unit 51.

[0074] Therefore, according to the communication control method S200, the same effects as those of the above-mentioned communication terminal 1 can be obtained.

[0075] Second Exemplary Embodiment A second exemplary embodiment, which is an example of an embodiment of the present invention, will be described in detail with reference to the drawings. Components having the same functions as those described in the above exemplary embodiment will be given the same reference numerals, and their description will be omitted as appropriate. The scope of application of each technical means adopted in this exemplary embodiment is not limited to this exemplary embodiment. That is, each technical means adopted in this exemplary embodiment can be adopted in other exemplary embodiments included in this disclosure, as long as no particular technical hindrance occurs. In addition, each technical means shown in each drawing referred to for explaining this exemplary embodiment can be adopted in other exemplary embodiments included in this disclosure, as long as no particular technical hindrance occurs.

[0076] (Configuration of communication system 110) The configuration of communication system 110 will be described with reference to Fig. 9. Fig. 9 is a block diagram showing the configuration of communication system 110.

[0077] As shown in Fig. 9, the communication system 110 includes a communication terminal 3A and a base station 4A. In the communication system 110, the communication terminal 3A and the base station 4A can transmit and receive data to and from each other via wireless communication. In Fig. 9, there is one communication terminal 3A and one base station 4A, but the number of communication terminals 3A and base stations 4A included in the communication system 110 is not limited, and the communication system 110 may include a plurality of communication terminals 3A and base stations 4A.

[0078] (Overview of communication system 110) An overview of the communication system 110 will be described with reference to Fig. 10. Fig. 10 is a diagram showing an overview of the communication system 110.

[0079] The communication terminal 3A includes an antenna unit (an antenna unit 31 described later) capable of controlling directivity. The communication terminal 3A and the base station 4A shown in Fig. 10 communicate with each other using one of 64QAM (Quadrature Amplitude Modulation), 16QAM, QPSK (Quadrature Phase Shift Keying), and BPSK (Binary Phase Shift Keying) as an example of a modulation method.

[0080] First, the communication terminal 3A attempts to establish communication with the base station 4A by controlling the directivity of the antenna unit to a wide directivity (as an example, the widest directivity) as shown in the upper part of Fig. 10. With this configuration, the communication terminal 3A can easily find the base station 4A.

[0081] Furthermore, when the communication terminal 3A attempts to establish communication with the base station 4A, the communication between the communication terminal 3A and the base station 4A uses a modulation method with a small modulation multi-level number (in other words, a modulation method with a long communication distance; in FIG. 10, BPSK is used as an example) as shown in the upper part of FIG. 10. This configuration allows the communication terminal 3A and the base station 4A to easily establish communication. Furthermore, the directivity of the antenna unit of the communication terminal 3A when the communication terminal 3A and the base station 4A establish communication is referred to as a first directivity. The first directivity is as described above.

[0082] When communication is established between the communication terminal 3A and the base station 4A, the base station 4A outputs information indicating the location of the base station 4A to the communication terminal 3A, as shown in the upper part of Fig. 10. When the communication terminal 3A acquires the information indicating the location of the base station 4A, the communication terminal 3A controls the directivity of the antenna unit to a directivity narrower than the first directivity based on the information and the moving speed of the communication terminal 3A, as shown in the lower part of Fig. 10, and communicates with the base station 4A. In this configuration, the directivity narrower than the first directivity of the communication terminal 3A is referred to as the second directivity. The second directivity is as described above.

[0083] Furthermore, when the communication terminal 3A communicates with the base station 4A using the second directivity, the communication between the communication terminal 3A and the base station 4A uses a modulation scheme with a large modulation multi-level number (in other words, a modulation scheme with high throughput, 64QAM as an example in FIG. 10) as shown in the lower part of Fig. 10. With this configuration, it is possible to achieve high throughput in the communication between the communication terminal 3A and the base station 4A.

[0084] (Configuration of communication terminal 3A) As shown in FIG. 9, the communication terminal 3A includes a control unit 37 and a storage unit 38 in addition to the antenna unit 31 included in the communication terminal 3.

[0085] As described above, the antenna unit 31 is an antenna unit capable of controlling directivity. A specific example of the antenna unit 31 is a multi-element antenna, but is not limited thereto. The communication terminal 3A performs wireless communication with the base station 4A via the antenna unit 31.

[0086] The storage unit 38 stores data referenced by the control unit 37. Examples of data stored in the storage unit 38 include, but are not limited to, radio wave maps and maps showing radio wave conditions for each location. Examples of radio wave conditions include, but are not limited to, reception power. Examples of the storage unit 38 include, but are not limited to, flash memory, HDD (Hard Disk Drive), SSD (Solid State Drive), or a combination thereof.

[0087] (Control unit 37) The control unit 37 controls each component included in the communication terminal 3A. As shown in Fig. 9, the control unit 37 includes an information acquisition unit 32A, a communication control unit 33A, an estimation unit 34, an update unit 35, and an output unit 36. In this exemplary embodiment, the information acquisition unit 32A, the communication control unit 33A, the estimation unit 34, and the update unit 35 are configured to realize an information acquisition means, a communication control means, an estimation means, and an update means, respectively.

[0088] The information acquisition unit 32A controls the antenna unit 31 to acquire information from the base station 4A. As one example, the information acquisition unit 32A controls the directivity of the antenna unit 31 to a first directivity, and acquires information indicating the position of the base station 4A from the base station 4A via the antenna unit 31. As another example, the information acquisition unit 32A acquires a radio wave map from the base station 4A.

[0089] The communication control unit 33A controls communication with the base station 4A. As an example, the communication control unit 33A controls the directivity of the antenna unit 31 to a first directivity, and establishes communication with the base station 4A via the antenna unit 31.

[0090] Furthermore, the communication control unit 33A controls the directivity of the antenna unit 31 to a second directivity narrower than the first directivity, and communicates with the base station 4A via the antenna unit 31. More specifically, the communication control unit 33A determines the second directivity based on the relative position between the base station 4A and the communication terminal 3A based on the information acquired by the information acquisition unit 32A, and the moving speed of the communication terminal 3A. The communication control unit 33A may calculate the moving speed of the communication terminal 3A based on information acquired from a sensor not shown in FIG. 9.

[0091] Furthermore, the communication control unit 33A may determine the second directivity based on the attitude of the communication terminal 3A in addition to the relative positions between the base station 4A and the communication terminal 3A and the moving speed of the communication terminal 3A. As an example, when the attitude of the communication terminal 3A is such that radio waves cannot be received in a predetermined direction, the communication control unit 33A communicates with the base station 4A in a direction different from the predetermined direction.

[0092] Furthermore, the communication control unit 33A determines a communication method for communication with the base station 4A via the antenna unit 31 based on the relative positions of the base station 4A and the communication terminal 3A and the moving speed of the communication terminal 3A. Examples of the communication method include, but are not limited to, a modulation method (e.g., 64QAM, 16QAM, QPSK, BPSK) and an error correction rate. The process executed by the communication control unit 33A will be described later.

[0093] The estimation unit 34 estimates the destination of the communication terminal 3A after a predetermined time. As an example, the estimation unit 34 estimates the destination of the communication terminal 3A after a predetermined time by referring to the moving speed of the communication terminal 3A, a map stored in the storage unit 38, and information indicating the position of the communication terminal 3A. An example of the information indicating the position of the communication terminal 3A is a GPS (Global Positioning System) signal.

[0094] For example, if the position of the communications terminal 3A is along a road, the estimation unit 34 estimates the position of the communications terminal 3A when it moves along the road at the moving speed of the communications terminal 3A for a predetermined time as the destination of the communications terminal 3A after the predetermined time.

[0095] The update unit 35 updates the radio wave map stored in the storage unit 38. As one example, the update unit 35 updates the radio wave map by associating the current reception power of the communication terminal 3A with the current location of the communication terminal 3A in the radio wave map. As another example, the update unit 35 updates the radio wave map stored in the storage unit 38 to the radio wave map acquired by the information acquisition unit 32A from the base station 4A.

[0096] Furthermore, the update unit 35 may associate a position on the radio wave map with the settings of the communication terminal 3A. As one example, the update unit 35 may associate a position on the radio wave map with a communication method by which the communication terminal 3A communicates with the base station 4A at that position. As another example, the update unit 35 may associate a position on the radio wave map with a communication method by which the communication terminal 3A was unable to communicate with the base station 4A at that position.

[0097] The output unit 36 ​​outputs information to the base station 4A. As an example, the output unit 36 ​​outputs information indicating the current location of the communication terminal 3A and the current reception power of the communication terminal 3A to the base station 4A.

[0098] (Configuration of base station 4A) The base station 4A includes a control unit 44, an antenna unit 45, and a storage unit .

[0099] The antenna unit 45 is an antenna for wireless communication with the communication terminal 3 A. The base station 4 A performs wireless communication with the communication terminal 3 A via the antenna unit 45.

[0100] The storage unit 46 stores data referenced by the control unit 44. Examples of data stored in the storage unit 46 include information indicating the position of the base station 4A and the radio wave map described above. Examples of the storage unit 46 include, but are not limited to, a flash memory, a HDD, an SSD, or a combination thereof.

[0101] (Control unit 44) The control unit 44 controls each component included in the base station 4A. As shown in Fig. 9, the control unit 44 includes an information output unit 41A, a communication control unit 42, and an update unit 43. In this exemplary embodiment, the information output unit 41A, the communication control unit 42, and the update unit 43 are configured to realize an information output means, a communication control means, and an update means, respectively.

[0102] The information output unit 41A outputs information to the communication terminal 3A. As one example, the information output unit 41A outputs information indicating the position of the base station 4A to the communication terminal 3A. As another example, the information output unit 41A outputs a radio wave map stored in the storage unit 46 to the communication terminal 3A.

[0103] The communication control unit 42 controls communication with the communication terminal 3 A. As an example, the communication control unit 42 establishes communication with the communication terminal 3 A via the antenna unit 45.

[0104] Furthermore, the communication control unit 42 determines a communication method for communication with the communication terminal 3A via the antenna unit 45. As an example, the communication control unit 42 acquires information on the channel state from the communication terminal 3A and determines the communication method based on the information. The process of determining the communication method by the communication control unit 42 will be described later.

[0105] The update unit 43 updates the radio wave map stored in the storage unit 46. As an example, the update unit 43 acquires information indicating the current location of the communication terminal 3A and the current reception power of the communication terminal 3A from the communication terminal 3A. The update unit 43 also updates the reception power at the location indicated by the acquired information in the radio wave map to the reception power indicated by the acquired information.

[0106] Furthermore, the update unit 43 may acquire information indicating the current location of the communication terminal 3A and the current reception power of the communication terminal 3A from each of the multiple communication terminals 3A. In this case, for a certain communication terminal 3A, the radio wave map becomes a radio wave map reflecting the radio wave conditions of the certain communication terminal 3A and the radio wave conditions of one or more other communication terminals 3A different from the certain communication terminal 3A. With this configuration, the update unit 43 can create a radio wave map reflecting the radio wave conditions of the multiple communication terminals 3A.

[0107] (Example 1 of a process in which the communication control unit 33A determines the second directivity) As an example of a process in which the communication control unit 33A determines the second directivity, the communication control unit 33A determines the second directivity using a learning model that receives at least the relative position between the base station 4A and the communication terminal 3A and the moving speed of the communication terminal 3A as input and is trained to output the second directivity.

[0108] The learning model is generated by learning past communication situations as teacher data. As an example, the learning model learns the past relative positions between the base station 4A and the communication terminal 3A, the moving speed of the communication terminal 3A, and the second directivity as a set of teacher data. One example of the learning model is a convolutional neural network (CNN).

[0109] In this way, the communication control unit 33A can suitably determine the second directivity by determining the second directivity using the learning model. In other words, the communication control unit 33A can determine a suitable second directivity without gradually widening the directivity from the first directivity to determine the second directivity. Therefore, the communication control unit 33A can shorten the time it takes to set the antenna directivity of the communication terminal 3A to a setting suitable for communication.

[0110] (Example 2 of process in which communication control unit 33A determines second directivity) Another example of the process in which the communication control unit 33A determines the second directivity is a process in which the communication control unit 33A determines the second directivity based on the relative positions between the base station 4A and the communication terminal 3A, the moving speed of the communication terminal 3A, and a radio wave map stored in the storage unit 38 and indicating the radio wave conditions for each location. The radio wave map in this configuration may be a radio wave map generated by the communication terminal 3A or may be a radio wave map acquired from the base station 4A. When the communication control unit 33A uses the radio wave map acquired from the base station 4A, the communication control unit 33A can also refer to the radio wave conditions of other communication terminals 3A.

[0111] As an example of this configuration, assume that the moving speed of the communication terminal 3A is 0 (in other words, the communication terminal 3A is not moving). In this case, the communication control unit 33 acquires the radio wave conditions of the area where the communication terminal 3A is located from the radio wave map based on the relative positions of the base station 4A and the communication terminal 3A. Next, the communication control unit 33 determines, from the radio wave conditions of the area where the communication terminal 3A is located, the narrowest directivity that allows communication with the base station 4A to be established in the radio wave conditions, as the second directivity.

[0112] In this way, the communication control unit 33A can suitably determine the second directivity by determining the second directivity based on the radio wave map. In other words, the communication control unit 33A can determine a suitable second directivity without gradually widening the directivity from the first directivity to determine the second directivity. Therefore, the communication control unit 33A can shorten the time it takes to set the antenna directivity of the communication terminal 3A to a setting suitable for communication.

[0113] As another example of this configuration, assume that the moving speed of the communication terminal 3A is other than 0 (in other words, the communication terminal 3A is moving). In this case, the communication control unit 33 acquires information indicating the destination of the communication terminal 3A after a predetermined time, which is estimated by the estimation unit 34. Next, the communication control unit 33 acquires the radio wave conditions of the area of ​​the destination of the communication terminal 3A estimated by the estimation unit 34 from the radio wave map. Next, the communication control unit 33 refers to the radio wave map, and based on the radio wave conditions of the area of ​​the destination of the communication terminal 3A estimated by the estimation unit 34, determines the narrowest directivity, which is a directivity that can establish communication with the base station 4A in the radio wave conditions, as the second directivity after the predetermined time.

[0114] In this way, even when the communication terminal 3A is moving, the communication control unit 33A can suitably determine the second directivity at the destination.

[0115] (Example 3 of process in which communication control unit 33A determines second directivity) As yet another example of a process in which the communication control unit 33A determines the second directivity, the communication control unit 33A determines the second directivity based on the relative position between the base station 4A and the communication terminal 3A and the movement speed of the communication terminal 3A.

[0116] As an example, the communication control unit 33A determines the main direction of the second directivity so that the main direction of the second directivity is a direction from the communication terminal 3A corresponding to the relative position to the base station 4A.

[0117] As another example, the communication control unit 33A determines the width of the second directivity (e.g., beam half-width) according to the moving speed of the communication terminal 3A. For example, assume that the moving speed of the communication terminal 3A is greater than a predetermined value (when the moving speed of the communication terminal 3A is fast). In this case, the communication control unit 33A determines the widest directivity, which is narrower than the first directivity and allows the communication terminal 3A and the base station 4A to establish communication, as the second directivity. As another example, assume that the moving speed of the communication terminal 3A is equal to or less than a predetermined value (when the moving speed of the communication terminal 3A is slow). In this case, the communication control unit 33A determines the narrowest directivity, which is narrower than the first directivity and allows the communication terminal 3A and the base station 4A to establish communication, as the second directivity.

[0118] (Example 1 of a process in which the communication control unit 33A determines a communication method) As described above, the communication method may be determined by the communication control unit 33A of the communication terminal 3A or by the communication control unit 42 of the base station 4A. Here, an example of a process in which the communication control unit 33A of the communication terminal 3A determines the communication method will be described.

[0119] For example, when the base station 4A adaptively selects from a plurality of modulation methods and error correction rates for communication, the communication control unit 33A of the communication terminal 3A calculates the distance to the base station 4A from the relative positions of the base station 4A and the communication terminal 3A. The communication control unit 33A determines the modulation method and error correction rate based on the calculated distance and the moving speed of the communication terminal 3A.

[0120] As an example, when the moving speed of the communication terminal 3A is 0 (in other words, when the communication terminal 3A is not moving), the communication control unit 33A determines a modulation method and an error correction rate according to the calculated distance. For example, the communication control unit 33A determines a modulation method with a smaller modulation multi-level number (in other words, a modulation method with a slower communication speed) and a higher error correction rate as the calculated distance is longer. On the other hand, the communication control unit 33A determines a modulation method with a larger modulation multi-level number (in other words, a modulation method with a faster communication speed) and a lower error correction rate as the calculated distance is shorter.

[0121] As another example, when the moving speed of the communication terminal 3A is other than 0 (in other words, when the communication terminal 3A is moving), the communication control unit 33A acquires information indicating the destination of the communication terminal 3A after a predetermined time, which is estimated by the estimation unit 34. Next, the communication control unit 33 acquires the radio wave conditions of the area of ​​the destination of the communication terminal 3A, which is estimated by the estimation unit 34, from the radio wave map. Next, the communication control unit 33 refers to the radio wave map and determines the modulation method and the error correction rate. For example, when the radio wave conditions of the area of ​​the destination of the communication terminal 3A, which is estimated by the estimation unit 34, are poor (for example, the received power is lower than a predetermined threshold), the communication control unit 33 determines a modulation method with a small modulation multi-level number and a high error correction rate. On the other hand, when the radio wave conditions of the area of ​​the destination of the communication terminal 3A, which is estimated by the estimation unit 34, are good (for example, the received power is equal to or higher than a predetermined threshold), the communication control unit 33 determines a modulation method with a large modulation multi-level number and a low error correction rate.

[0122] As yet another example, the communication control unit 33A may determine the communication method using a learning model that is trained to receive at least the calculated distance and moving speed and output the communication method.

[0123] In this way, the communication control unit 33A of the communication terminal 3A determines the communication method for communication between the communication terminal 3A and the base station 4A. Therefore, when the base station 4A adaptively selects from a plurality of modulation methods and error correction rates for communication, the communication control unit 33A can select an appropriate modulation method and error correction rate.

[0124] (Example 2 of a process in which the communication control unit 33A determines a communication method) The communication control unit 33A may be configured to monitor the quality of communication with the base station 4A. In this configuration, the communication control unit 33A determines the modulation method and the error correction rate according to the radio wave conditions. An example of the communication quality is the received power, but is not limited to this.

[0125] For example, when the radio wave condition with the base station 4A is below a threshold for a predetermined period, the communication control unit 33A determines a modulation method with a small modulation level and a high error correction rate. That is, when the communication quality with the base station 4A is below a threshold for a predetermined period, the communication control unit 33A determines the communication method with the base station 4A to be a communication method for low-speed and stable communication. In this case, after determining the communication method for low-speed and stable communication, the communication control unit 33A may gradually change the communication method to a communication method for high-speed communication at predetermined intervals.

[0126] (An example of a process in which the communication control unit 42 determines the communication method) Here, an example of a process in which the communication control unit 42 of the base station 4A determines the communication method will be described.

[0127] As an example, the communication control unit 42 acquires information on the channel state from the communication terminal 3A and determines the communication method based on the information. For example, when the information acquired from the communication terminal 3A indicates a communication quality below a threshold, the communication control unit 42 determines a modulation method with a small modulation level and a high error correction rate. On the other hand, when the information acquired from the communication terminal 3A indicates a communication quality above the threshold, the communication control unit 42 determines a modulation method with a small modulation level and a high error correction rate.

[0128] In this way, the communication control unit 42 of the base station 4A determines the communication method for communication between the communication terminal 3A and the base station 4A. Therefore, the communication control unit 42 allows the communication terminal 3A and the base station 4A to communicate with each other using a suitable communication method.

[0129] (Flow of communication control method S110) The flow of the communication control method S110 executed in the communication system 110 will be described with reference to Fig. 11. Fig. 11 is a flow diagram showing the flow of the communication control method S110.

[0130] (Step S111) In step S111, the communication control unit 33A of the communication terminal 3A controls the directivity of the antenna unit 31 to the first directivity, and establishes communication with the base station 4A via the antenna unit 31.

[0131] (Step S112) In step S112, the communication control unit 42 of the base station 4A establishes communication with the communication terminal 3A via the antenna unit 45.

[0132] (Step S113) In step S113, the information output unit 41A outputs information indicating the position of the base station 4A to the communication terminal 3A.

[0133] (Step S114) In step S114, the information acquisition unit 32A controls the directivity of the antenna unit 31 to the first directivity, and acquires, via the antenna unit 31, information indicating the position of the base station 4A from the base station 4A.

[0134] (Step S115) In step S115, the communication control unit 33A controls the directivity of the antenna unit 31 to a second directivity narrower than the first directivity based on the relative position between the base station 4A and the communication terminal 3A based on the position of the base station 4A and the moving speed of the communication terminal 3A, and communicates with the base station 4A via the antenna unit 31.

[0135] (Effects of the communication system 110) As described above, in communication system 110 including communication terminal 3A and base station 4A, communication terminal 3A determines the second directivity based on the relative position between base station 4A and communication terminal 3A based on information indicating the position of base station 4A obtained from base station 4A, and based on the moving speed of communication terminal 3A.

[0136] Therefore, in the communication system 110, a suitable second directivity is determined without gradually widening the directivity from the first directivity to determine the second directivity. Therefore, in the communication system 110, an effect is obtained in that it is possible to shorten the time required to set the antenna directivity of the communication terminal 3A to a setting suitable for communication.

[0137] Third Exemplary Embodiment A third exemplary embodiment, which is an example of an embodiment of the present invention, will be described in detail with reference to the drawings. Components having the same functions as those described in the above exemplary embodiment will be given the same reference numerals, and their description will be omitted as appropriate. The scope of application of each technical means employed in this exemplary embodiment is not limited to this exemplary embodiment. That is, each technical means employed in this exemplary embodiment can be employed in other exemplary embodiments included in this disclosure, as long as no particular technical hindrance occurs. In addition, each technical means shown in each drawing referred to for explaining this exemplary embodiment can be employed in other exemplary embodiments included in this disclosure, as long as no particular technical hindrance occurs.

[0138] (Configuration of communication system 210) The configuration of the communication system 210 will be described with reference to Fig. 12. Fig. 12 is a block diagram showing the configuration of the communication system 210.

[0139] 12, the communication system 210 includes a communication terminal 5A and a base station 6A. In the communication system 210, similar to the above-described communication system 110, the communication terminal 5A and the base station 6A can transmit and receive data to and from each other via wireless communication. Furthermore, the number of communication terminals 5A and base stations 6A included in the communication system 210 is not limited, and the communication system 210 may include a plurality of communication terminals 5A and base stations 6A.

[0140] (Overview of communication system 210) An overview of the communication system 210 will be described with reference to Fig. 13. Fig. 13 is a diagram showing an overview of the communication system 210.

[0141] The communication terminal 5A includes an antenna unit (an antenna unit 51 described later) capable of controlling directivity. The communication terminal 5A and the base station 6A shown in Fig. 13 communicate with each other using one of 64QAM, 16QAM, QPSK, and BPSK as an example of a modulation method.

[0142] First, the communication terminal 5A tries to establish communication with the base station 6A by controlling the directivity of the antenna unit to a wide directivity (the widest directivity as an example) as shown in the upper part of Fig. 13. With this configuration, the communication terminal 5A can easily find the base station 6A.

[0143] Furthermore, when the communication terminal 5A attempts to establish communication with the base station 6A, the communication between the communication terminal 5A and the base station 6A uses a modulation method with a small modulation multi-level number (in other words, a modulation method with a long communication distance, BPSK is used as an example in FIG. 13) as shown in the upper part of FIG. 13. This configuration allows the communication terminal 5A and the base station 6A to easily establish communication. Furthermore, similar to the above-mentioned embodiment, the directivity of the antenna of the communication terminal 5A when the communication terminal 5A and the base station 6A establish communication is referred to as a first directivity.

[0144] When communication terminal 5A and base station 6A establish communication, as shown in the upper part of Fig. 13, communication terminal 5A outputs information indicating the first directivity, the position of communication terminal 5A, and the moving speed of communication terminal 5A to base station 6A. When base station 6A acquires the information indicating the first directivity, the position of communication terminal 5A, and the moving speed of communication terminal 5A, it instructs communication terminal 5A. As an example, base station 6A controls the directivity of the antenna unit to a second directivity narrower than the first directivity, and instructs communication terminal 5A to communicate with base station 6A. Based on the instruction from base station 6A, communication terminal 5A controls the directivity of the antenna unit to the second directivity narrower than the first directivity, and communicates with base station 4A.

[0145] Furthermore, when the communication terminal 5A communicates with the base station 6A using the second directivity, the communication between the communication terminal 5A and the base station 6A uses a modulation scheme with a large modulation multi-level number (in other words, a modulation scheme with high throughput, 64QAM as an example in FIG. 13) as shown in the lower part of FIG. 13. With this configuration, it is possible to achieve high throughput in the communication between the communication terminal 5A and the base station 6A.

[0146] (Configuration of communication terminal 5A) As shown in FIG. 12, the communication terminal 5A includes a control unit 57 and a storage unit 58 in addition to the antenna unit 51 included in the communication terminal 5.

[0147] As described above, the antenna unit 51 is an antenna unit capable of controlling directivity. A specific example of the antenna unit 51 is a multi-element antenna, but is not limited thereto. The communication terminal 5A performs wireless communication with the base station 6A via the antenna unit 51.

[0148] The storage unit 58 stores data referenced by the control unit 57. The data and examples stored in the storage unit 58 are similar to those of the storage unit 38 described above.

[0149] (Control unit 57) The control unit 57 controls each component included in the communication terminal 5A. The control unit 57 also includes an information output unit 52A, a reception unit 53A, and a communication control unit 54A, as shown in Fig. 12. The information output unit 52A, the reception unit 53A, and the communication control unit 54A are components that respectively realize an information output means, a reception means, and a communication control means in this exemplary embodiment.

[0150] The information output unit 52A outputs information to the base station 6A. As an example, the information output unit 52A outputs information indicating the first directivity of the antenna unit 51, the position of the communication terminal 5A, and the moving speed of the communication terminal 5A to the base station 6A when the communication terminal 5A is communicating with the base station 6A. As another example, the information output unit 52A outputs information indicating the current position of the communication terminal 5A and the current reception power of the communication terminal 5A to the base station 6A. An example of the information indicating the position of the communication terminal 5A is a GPS signal. Also, the moving speed of the communication terminal 5A may be calculated based on information acquired from a sensor not shown in FIG. 12.

[0151] The reception unit 53A receives an instruction from the base station 6A. As an example, the reception unit 53A receives an instruction to control the directivity of the antenna unit 51 to a second directivity narrower than the first directivity and to communicate with the base station 6A via the antenna unit 51.

[0152] The communication control unit 54A controls communication with the base station 6A. As an example, the communication control unit 54A controls the antenna unit 51 according to an instruction received by the reception unit 53A. For example, assume that the instruction received by the reception unit 53A is an instruction to control the directivity of the antenna unit 51 to a second directivity narrower than the first directivity and to communicate with the base station 6A via the antenna unit 51. In this case, the communication control unit 54A controls the directivity of the antenna unit 51 to the second directivity narrower than the first directivity and communicates with the base station 6A via the antenna unit 51.

[0153] (Configuration of base station 6A) The base station 6 A includes a control unit 66 , an antenna unit 67 , and a storage unit 68 .

[0154] The antenna unit 67 is an antenna for wireless communication with the communication terminal 5 A. The base station 6A performs wireless communication with the communication terminal 5 A via the antenna unit 67.

[0155] The storage unit 68 stores data referenced by the control unit 66. Examples of data stored in the storage unit 68 include information acquired from the communication terminal 5A, information indicating the position of the base station 6A, and a radio wave map. Examples of the storage unit 68 include, but are not limited to, a flash memory, an HDD, an SSD, or a combination thereof.

[0156] (Control unit 66) The control unit 66 controls each component included in the base station 6A. As shown in Fig. 12, the control unit 66 includes an information acquisition unit 61A, an instruction unit 62A, a communication control unit 63, an estimation unit 64, and an update unit 65. In this exemplary embodiment, the information acquisition unit 61A, the instruction unit 62A, the communication control unit 63, and the update unit 65 are configured to realize an information acquisition means, an instruction means, a communication control means, and an update means, respectively.

[0157] The information acquisition unit 61A acquires information from the communication terminal 5A. As an example, the information acquisition unit 61A acquires information indicating the first directivity, the position of the communication terminal 5A, and the moving speed of the communication terminal 5A from the communication terminal 5A. The information acquisition unit 61A also acquires information indicating the current position of the communication terminal 5A and the current reception power of the communication terminal 5A from the communication terminal 5A.

[0158] The instruction unit 62A instructs the communication terminal 5A. As an example, the instruction unit 62A controls the directivity of the antenna unit 51 to a second directivity narrower than the first directivity, and instructs the communication terminal 5A to communicate with the base station 6A via the antenna unit 51. An example of the process executed by the instruction unit 62A will be described later.

[0159] The communication control unit 63 controls communication with the communication terminal 5A, similar to the above-mentioned communication control unit 42. As an example, the communication control unit 63 determines the communication method for communication between the communication terminal 5A and the base station 6A based on the relative positions of the base station 6A and the communication terminal 5A and the moving speed of the communication terminal 5A, which are based on the information acquired by the information acquisition unit 61A. The communication method is as described above.

[0160] The estimation unit 64 estimates the destination of the communication terminal 5A after a predetermined time, similar to the above-mentioned estimation unit 34. The example in which the estimation unit 64 estimates the destination of the communication terminal 5A after a predetermined time is as described above.

[0161] The update unit 65 updates the radio wave map stored in the storage unit 46, similar to the update unit 43 described above. As an example of the update unit 65 updating the radio wave map, similar to the example described above, the update unit 65 first acquires information indicating the position and reception power of the communication terminal 5A acquired by the information acquisition unit 61A from the communication terminal 5A. Then, the update unit 65 updates the radio wave map based on the information indicating the position and reception power of the communication terminal 5A. With this configuration, the update unit 65 can create a radio wave map that reflects the radio wave conditions of the communication terminal 3A.

[0162] (Example 1 of a process in which the instruction unit 62A determines the second directivity) One example of a process in which the instruction unit 62A determines the second directivity is a process in which the instruction unit 62A determines the second directivity using a learning model that is trained to output the second directivity by inputting at least the first directivity, the relative position between the base station 6A and the communication terminal 5A, and the moving speed of the communication terminal 5A.

[0163] The learning model is generated by learning past communication conditions as teacher data. As an example, the learning model learns a past first directivity, a past relative position between the base station 6A and the communication terminal 5A, a moving speed of the communication terminal 5A, and a second directivity as a set of teacher data. One example of the learning model is CNN.

[0164] In this way, the instruction unit 62A can suitably determine the second directivity by determining the second directivity using the learning model. In other words, the instruction unit 62A can determine a suitable second directivity without gradually widening the directivity from the first directivity to determine the second directivity. Therefore, the instruction unit 62A can shorten the time until the antenna directivity of the communication terminal 5A is set to a setting suitable for communication.

[0165] (Example 2 of process in which the instruction unit 62A determines the second directivity) Another example of a process in which the instruction unit 62A determines the second directivity is a process in which the instruction unit 62A determines the second directivity based on the first directivity, the relative position between the base station 6A and the communication terminal 5A, the moving speed of the communication terminal 5A, and a radio wave map stored in the memory unit 46 that indicates the radio wave conditions for each location.

[0166] As an example of this configuration, assume that the moving speed of the communication terminal 5A is 0 (in other words, the communication terminal 5A is not moving). In this case, the instruction unit 62A acquires the radio wave conditions of the area where the communication terminal 5A is located from a radio wave map. Next, the instruction unit 62A determines, from the radio wave conditions of the area where the communication terminal 5A is located, the narrowest directivity that is narrower than the first directivity and allows communication to be established with the base station 6A in the radio wave conditions, as the second directivity.

[0167] As another example of this configuration, a case where the moving speed of the communication terminal 5A is other than 0 (in other words, the communication terminal 5A is moving) is assumed. In this case, the instruction unit 62A acquires information indicating the destination of the communication terminal 5A after a predetermined time, which is estimated by the estimation unit 64. Next, the instruction unit 62A acquires the radio wave conditions of the area of ​​the destination of the communication terminal 5A estimated by the estimation unit 64 from the radio wave map. Next, the instruction unit 62A refers to the radio wave map and determines, based on the radio wave conditions of the area of ​​the destination of the communication terminal 5A estimated by the estimation unit 64, the narrowest directivity that is narrower than the first directivity and allows communication with the base station 6A to be established in the radio wave conditions, as the second directivity after the predetermined time.

[0168] In this way, the instruction unit 62A can suitably determine the second directivity by determining the second directivity based on the radio wave map. In other words, the instruction unit 62A can determine a suitable second directivity without gradually widening the directivity from the first directivity to determine the second directivity. Therefore, the instruction unit 62A can shorten the time required to set the antenna directivity of the communication terminal 5A to a setting suitable for communication.

[0169] (Flow of communication control method S210) The flow of the communication control method S210 executed in the communication system 210 will be described with reference to Fig. 14. Fig. 14 is a flow diagram showing the flow of the communication control method S210.

[0170] (Step S211) In step S211, the communication control unit 54A of the communication terminal 5A controls the directivity of the antenna unit 51 to the first directivity, and establishes communication with the base station 6A via the antenna unit 51.

[0171] (Step S212) In step S212, the communication control unit 63 of the base station 6A establishes communication with the communication terminal 5A via the antenna unit 67.

[0172] (Step S213) In step S213, the information output unit 52A of the communication terminal 5A outputs to the base station 6A information indicating the first directivity of the antenna unit 51, the position of the communication terminal 5A, and the moving speed of the communication terminal 5A when the communication terminal 5A is communicating with the base station 6A.

[0173] (Step S214) In step S214, the information acquisition unit 61A of the base station 6A acquires information from the communication terminal 5A indicating the first directivity of the antenna unit 51, the position of the communication terminal 5A, and the moving speed of the communication terminal 5A when the communication terminal 5A is communicating with the base station 6A.

[0174] (Step S215) In step S215, the instruction unit 62A controls the directivity of the antenna unit 51 to a second directivity narrower than the first directivity based on the relative position between the base station 6A and the communication terminal 5A based on the position of the communication terminal 5A and the movement speed of the communication terminal 5A, and instructs the communication terminal 5A to communicate with the base station 6A via the antenna unit 51.

[0175] (Step S216) In step S216, the reception unit 53A of the communication terminal 5A receives the instruction from the base station 6A.

[0176] (Step S217) In step S217, the communication control unit 54A controls the directivity of the antenna unit 51 in accordance with the instruction received by the reception unit 53A, and communicates with the base station 6A via the antenna unit 51.

[0177] (Effects of the communication system 210) As described above, in the communication system 210 including the communication terminal 5A and the base station 6A, the base station 4A determines the second directivity based on information indicating the first directivity, the position of the communication terminal 5A, and the movement speed of the communication terminal 5A obtained from the communication terminal 5A.

[0178] Therefore, in the communication system 210, a suitable second directivity is determined without gradually widening the directivity from the first directivity to determine the second directivity. Therefore, in the communication system 210, an effect is obtained in that it is possible to shorten the time until the antenna directivity of the communication terminal 5A is set to a setting suitable for communication.

[0179] [Software implementation example] Some or all of the functions of the communication terminals 1, 3, 3A, 5, 5A and base stations 2, 4, 4A, 6, 6A (hereinafter also referred to as "the above-mentioned devices") may be realized by hardware such as an integrated circuit (IC chip), or by software.

[0180] In the latter case, each of the above devices is realized, for example, by a computer that executes instructions of a program, which is software that realizes each function. An example of such a computer (hereinafter, referred to as computer C) is shown in Fig. 15. Fig. 15 is a block diagram showing the hardware configuration of computer C that functions as each of the above devices.

[0181] The computer C includes at least one processor C1 and at least one memory C2. The memory C2 stores a program P for causing the computer C to operate as each of the above-mentioned devices. In the computer C, the processor C1 reads and executes the program P from the memory C2, thereby realizing the functions of each of the above-mentioned devices.

[0182] The processor C1 may be, for example, a central processing unit (CPU), a graphic processing unit (GPU), a digital signal processor (DSP), a micro processing unit (MPU), a floating point number processing unit (FPU), a physics processing unit (PPU), a tensor processing unit (TPU), a quantum processor, a microcontroller, or a combination thereof. The memory C2 may be, for example, a flash memory, a hard disk drive (HDD), a solid state drive (SSD), or a combination thereof.

[0183] The computer C may further include a RAM (Random Access Memory) for expanding the program P during execution and for temporarily storing various data. The computer C may further include a communication interface for transmitting and receiving data to and from other devices. The computer C may further include an input / output interface for connecting input / output devices such as a keyboard, a mouse, a display, and a printer.

[0184] Furthermore, the program P can be recorded on a non-transitory tangible recording medium M that can be read by the computer C. Such a recording medium M can be, for example, a tape, a disk, a card, a semiconductor memory, or a programmable logic circuit. The computer C can obtain the program P via such a recording medium M. Furthermore, the program P can be transmitted via a transmission medium. Such a transmission medium can be, for example, a communication network or broadcast waves. The computer C can also obtain the program P via such a transmission medium.

[0185] [Additional Note 1] This disclosure includes the techniques described in the following appendices. However, the present invention is not limited to the techniques described in the following appendices, and various modifications are possible within the scope of the claims.

[0186] (Appendix 1) A communication terminal comprising: an antenna unit capable of controlling directivity; an information acquisition means for controlling the directivity of the antenna unit to a first directivity and acquiring information indicating the position of the base station from the base station via the antenna unit; and a communication control means for controlling the directivity of the antenna unit to a second directivity narrower than the first directivity and communicating with the base station via the antenna unit, wherein the communication control means determines the second directivity based on a relative position between the base station and the communication terminal based on the information, and on a moving speed of the communication terminal.

[0187] (Appendix 2) The communication terminal described in Appendix 1, wherein the communication control means determines the second directivity using a learning model that receives at least the relative position between the base station and the communication terminal and the moving speed of the communication terminal as input and is trained to output the second directivity.

[0188] (Appendix 3) The communication terminal described in Appendix 1, wherein the communication control means determines the second directivity based on the relative position between the base station and the communication terminal, the moving speed of the communication terminal, and a radio wave map showing radio wave conditions at each location.

[0189] (Appendix 4) The communication terminal of claim 3, further comprising an estimation means for estimating a destination of the communication terminal after a predetermined time, wherein the communication control means refers to the radio wave map and determines the second directivity after the predetermined time based on the radio wave conditions of the destination estimated by the estimation means.

[0190] (Appendix 5) The communication terminal according to claim 3 or 4, wherein the radio wave map reflects the radio wave conditions of the communication terminal and one or more other communication terminals different from the communication terminal.

[0191] (Appendix 6) 5. The communication terminal according to claim 1, wherein the communication control means determines a communication method for the communication based on a relative position between the base station and the communication terminal, and a moving speed of the communication terminal.

[0192] (Appendix 7) A base station comprising: an information acquisition means for acquiring, from a communication terminal having an antenna unit capable of controlling directivity, information indicating a first directivity of the antenna unit, a position of the communication terminal, and a moving speed of the communication terminal when the communication terminal is communicating with the base station; and an instruction means for instructing the communication terminal to control the directivity of the antenna unit to a second directivity narrower than the first directivity, and to communicate with the base station via the antenna unit, wherein the instruction means determines the second directivity based on the relative position between the base station and the communication terminal based on the information, and the moving speed of the communication terminal.

[0193] (Appendix 8) The base station described in Appendix 7, wherein the instruction means determines the second directivity using a learning model that is trained to output the second directivity by inputting at least the first directivity, a relative position between the base station and the communication terminal, and a moving speed of the communication terminal.

[0194] (Appendix 9) The base station according to claim 7, wherein the instruction means determines the second directivity based on the first directivity, a relative position between the base station and the communication terminal, a moving speed of the communication terminal, and a radio wave map showing radio wave conditions at each location.

[0195] (Appendix 10) The base station according to any one of appendixes 7 to 9, further comprising a communication control means for determining a communication method for the communication based on a relative position between the base station and the communication terminal based on the information and a moving speed of the communication terminal.

[0196] (Appendix 11) A base station as described in Appendix 7 or 8, further comprising an update means for updating a radio wave map, wherein the information acquisition means further acquires information indicating a position and received power of the communication terminal from the communication terminal, and the update means updates the radio wave map based on the information indicating the position and received power of the communication terminal.

[0197] (Appendix 12) A communication system comprising a communication terminal and a base station, wherein the communication terminal comprises an antenna unit having controllable directivity, an information acquisition means for controlling the directivity of the antenna unit to a first directivity and acquiring information indicating a position of the base station from the base station via the antenna unit, and a communication control means for controlling the directivity of the antenna unit to a second directivity narrower than the first directivity and communicating with the base station via the antenna unit, wherein the communication control means determines the second directivity based on a relative position between the base station and the communication terminal based on the information and on a moving speed of the communication terminal, and the base station comprises information output means for outputting information indicating the position of the base station to the communication terminal.

[0198] (Appendix 13) A communication system comprising a communication terminal and a base station, wherein the communication terminal comprises an antenna unit capable of controlling directivity, an information output means for outputting information indicating a first directivity of the antenna unit, a position of the communication terminal, and a moving speed of the communication terminal when the communication terminal is communicating with the base station, to the base station, a receiving means for receiving instructions from the base station, and a communication control means for controlling the directivity of the antenna unit in accordance with the instructions and communicating with the base station via the antenna unit, wherein the base station comprises information acquiring means for acquiring the information from the communication terminal, and an instruction means for instructing the communication terminal to control the directivity of the antenna unit to a second directivity narrower than the first directivity and communicate with the base station via the antenna unit, and the instruction means determines the second directivity based on the relative position between the base station and the communication terminal based on the information, and the moving speed of the communication terminal.

[0199] (Appendix 14) A communication control method comprising: a communication terminal having an antenna unit with controllable directivity controls the directivity of the antenna unit to a first directivity and acquires information indicating the position of the base station from the base station via the antenna unit; and controls the directivity of the antenna unit to a second directivity narrower than the first directivity and communicates with the base station via the antenna unit, wherein, in performing the communication, the second directivity is determined based on the relative position between the base station and the communication terminal based on the information, and on the moving speed of the communication terminal.

[0200] (Appendix 15) A program that causes a computer to execute an information acquisition process that controls the directivity of an antenna unit to a first directivity and acquires information indicating the position of the base station from a base station via the antenna unit, and a communication control process that controls the directivity of the antenna unit to a second directivity narrower than the first directivity and communicates with the base station via the antenna unit, and in the communication control process, determines the second directivity based on the relative position between the base station and the communication terminal based on the information, and on the moving speed of the communication terminal.

[0201] (Appendix 16) A communication control method comprising: a base station acquiring, from a communication terminal equipped with an antenna unit capable of controlling directivity, information indicating a first directivity of the antenna unit, the position of the communication terminal, and the moving speed of the communication terminal when the communication terminal is communicating with the base station; and instructing the communication terminal to control the directivity of the antenna unit to a second directivity narrower than the first directivity, and to communicate with the base station via the antenna unit, wherein, in instructing, the second directivity is determined based on the relative position between the base station and the communication terminal based on the information, and the moving speed of the communication terminal.

[0202] (Appendix 17) A program that causes a computer to execute an information acquisition process to acquire, from a communication terminal having an antenna unit capable of controlling directivity, information indicating a first directivity of the antenna unit, a position of the communication terminal, and a moving speed of the communication terminal when the communication terminal is communicating with a base station, and an instruction process to instruct the communication terminal to control the directivity of the antenna unit to a second directivity narrower than the first directivity, and to communicate with the base station via the antenna unit, and in the instruction process, determine the second directivity based on the relative position between the base station and the communication terminal based on the information, and the moving speed of the communication terminal.

[0203] (Appendix 18) A communication control method executed by a communication system having a communication terminal and a base station, the method including: the base station outputting information indicating a position of the base station to the communication terminal; the communication terminal having an antenna unit capable of controlling directivity controlling the directivity of the antenna unit to a first directivity and acquiring information indicating the position of the base station from the base station via the antenna unit; and controlling the directivity of the antenna unit to a second directivity narrower than the first directivity and communicating with the base station via the antenna unit, wherein, in communicating with the base station, the second directivity is determined based on a relative position between the base station and the communication terminal based on the information and on a moving speed of the communication terminal.

[0204] (Appendix 19) A communication control method executed by a communication system having a communication terminal and a base station, the communication terminal having an antenna unit capable of controlling directivity outputs information indicating a first directivity of the antenna unit, a position of the communication terminal, and a moving speed of the communication terminal when the communication terminal is communicating with the base station, to the base station, the base station acquiring the information from the communication terminal, and instructing the communication terminal to control the directivity of the antenna unit to a second directivity narrower than the first directivity and to communicate with the base station via the antenna unit, the communication terminal accepting the instruction from the base station, and controlling the directivity of the antenna unit in accordance with the instruction to communicate with the base station via the antenna unit, the communication control method including: determining the second directivity based on the relative position between the base station and the communication terminal based on the information, and the moving speed of the communication terminal,

[0205] [Additional Note 2] This disclosure includes the techniques described in the following appendices. However, the present invention is not limited to the techniques described in the following appendices, and various modifications are possible within the scope of the claims.

[0206] (Appendix 1) A communication terminal comprising an antenna unit capable of controlling directivity and at least one processor, the at least one processor executing an information acquisition process of controlling the directivity of the antenna unit to a first directivity and acquiring information indicating the position of the base station from the base station via the antenna unit, and a communication control process of controlling the directivity of the antenna unit to a second directivity narrower than the first directivity and communicating with the base station via the antenna unit, and determining the second directivity in the communication control process based on the relative position between the base station and the communication terminal based on the information and on the moving speed of the communication terminal.

[0207] (Appendix 2) The communication terminal of claim 1, wherein the at least one processor, in the communication control process, determines the second directivity using a learning model that is trained to output the second directivity by inputting at least the relative position between the base station and the communication terminal and the moving speed of the communication terminal.

[0208] (Appendix 3) The communication terminal of claim 1, wherein the at least one processor determines the second directivity based on the relative position between the base station and the communication terminal, the moving speed of the communication terminal, and a radio wave map showing radio wave conditions at each location, in the communication control process.

[0209] (Appendix 4) The communication terminal described in Appendix 3, wherein the at least one processor further executes an estimation process to estimate a destination of the communication terminal after a predetermined time, and in the communication control process, refers to the radio wave map and determines the second directivity after the predetermined time based on the radio wave conditions of the destination estimated by the estimation means.

[0210] (Appendix 5) The communication terminal according to claim 3 or 4, wherein the radio wave map reflects the radio wave conditions of the communication terminal and one or more other communication terminals different from the communication terminal.

[0211] (Appendix 6) The communication terminal according to any one of appendices 1 to 4, wherein, in the communication control process, the at least one processor determines a communication method for the communication based on a relative position between the base station and the communication terminal and a moving speed of the communication terminal.

[0212] (Appendix 7) A base station comprising at least one processor, the at least one processor executing an information acquisition process for acquiring, from a communication terminal having an antenna unit capable of controlling directivity, information indicating a first directivity of the antenna unit, a position of the communication terminal, and a moving speed of the communication terminal when the communication terminal is communicating with the base station, and an instruction process for instructing the communication terminal to control the directivity of the antenna unit to a second directivity narrower than the first directivity, and to communicate with the base station via the antenna unit, and in the instruction process, determining the second directivity based on the relative position between the base station and the communication terminal based on the information, and the moving speed of the communication terminal.

[0213] (Appendix 8) The base station described in Appendix 7, wherein, in the instruction process, the at least one processor determines the second directivity using a learning model that is trained to output the second directivity by inputting at least the first directivity, a relative position between the base station and the communication terminal, and a moving speed of the communication terminal.

[0214] (Appendix 9) The base station described in Appendix 7, wherein, in the instruction process, the at least one processor determines the second directivity based on the first directivity, a relative position between the base station and the communication terminal, a moving speed of the communication terminal, and a radio wave map indicating radio wave conditions at each location.

[0215] (Appendix 10) The base station according to any one of appendices 7 to 9, wherein the at least one processor further executes a communication control process for determining a communication method for the communication based on a relative position between the base station and the communication terminal based on the information and a moving speed of the communication terminal.

[0216] (Appendix 11) A base station as described in any of Appendices 7 to 9, wherein the at least one processor further executes an update process to update a radio wave map, and in the information acquisition process, further acquires information indicating a position and received power of the communication terminal from the communication terminal, and in the update process, updates the radio wave map based on the information indicating the position and received power of the communication terminal.

[0217] (Appendix 12) A communication system comprising a communication terminal and a base station, wherein the communication terminal comprises an antenna unit capable of controlling directivity, and at least one processor, and the at least one processor executes an information acquisition process of controlling the directivity of the antenna unit to a first directivity and acquiring information indicating a position of the base station from the base station via the antenna unit, and a communication control process of controlling the directivity of the antenna unit to a second directivity narrower than the first directivity and communicating with the base station via the antenna unit, wherein in the communication control process, the second directivity is determined based on a relative position between the base station and the communication terminal based on the information, and on a moving speed of the communication terminal, and the base station comprises at least one processor, and the at least one processor executes an information output process of outputting information indicating the position of the base station to the communication terminal.

[0218] (Appendix 13) A communication system comprising a communication terminal and a base station, wherein the communication terminal comprises an antenna unit capable of controlling directivity, and at least one processor, and the at least one processor executes an information output process to output information indicating a first directivity of the antenna unit, a position of the communication terminal, and a moving speed of the communication terminal when the communication terminal is communicating with the base station, to the base station, a reception process to receive instructions from the base station, and a communication control process to control the directivity of the antenna unit in accordance with the instructions and communicate with the base station via the antenna unit, and the base station comprises at least one processor, and the at least one processor executes an information acquisition process to acquire the information from the communication terminal, and an instruction process to instruct the communication terminal to control the directivity of the antenna unit to a second directivity narrower than the first directivity and communicate with the base station via the antenna unit, and in the instruction process, the second directivity is determined based on a relative position between the base station and the communication terminal based on the information, and the moving speed of the communication terminal. [Explanation of symbols]

[0219] 1, 3, 3A, 5, 5A Communication terminal 2, 4, 4A, 6, 6A base station 11, 31, 45, 51, 67 Antenna section 12, 21, 32, 32A, 61, 61A Information acquisition section 22, 62, 62A indicator 34, 64 Guessing part 35, 43, 65 update section 36 Output section 37, 44, 57, 66 Control section 38, 46, 58, 68 memory section 41, 41A, 52, 52A Information output section 53, 53A Reception 100, 110, 200, 210 Communication Systems

Claims

1. An antenna unit capable of controlling directivity; an information acquisition means for controlling a directivity of the antenna unit to a first directivity and acquiring information indicating a position of the base station from the base station via the antenna unit; a communication control means for controlling a directivity of the antenna unit to a second directivity narrower than the first directivity and communicating with the base station via the antenna unit, the communication control means determines the second directivity based on a relative position between the base station and the communication terminal based on the information and a moving speed of the communication terminal; Communications terminal.

2. the communication control means determines the second directivity using a learning model that is trained to output the second directivity based on at least the relative position between the base station and the communication terminal and the moving speed of the communication terminal; The communication terminal according to claim 1.

3. the communication control means determines the second directivity based on a relative position between the base station and the communication terminal, a moving speed of the communication terminal, and a radio wave map showing radio wave conditions for each location; The communication terminal according to claim 1.

4. The communication device further includes a prediction unit for predicting a destination of the communication terminal after a predetermined time, the communication control means refers to the radio wave map, and determines the second directivity after the predetermined time based on the radio wave conditions of the destination estimated by the estimation means. The communication terminal according to claim 3.

5. The radio wave map is a radio wave map reflecting the radio wave conditions of the communication terminal and the radio wave conditions of one or more other communication terminals different from the communication terminal.

5. A communication terminal according to claim 3 or 4.

6. the communication control means determines a communication method for the communication based on a relative position between the base station and the communication terminal and a moving speed of the communication terminal; A communication terminal according to any one of claims 1 to 4.

7. an information acquiring means for acquiring, from a communication terminal having an antenna unit capable of controlling directivity, information indicating a first directivity of the antenna unit, a position of the communication terminal, and a moving speed of the communication terminal when the communication terminal is communicating with the base station; an instruction means for instructing the communication terminal to control a directivity of the antenna unit to a second directivity narrower than the first directivity and to communicate with the base station via the antenna unit; the instruction means determines the second directivity based on a relative position between the base station and the communication terminal based on the information and on a moving speed of the communication terminal. Base station.

8. the instruction means determines the second directivity using a learning model that is trained to output the second directivity by inputting at least the first directivity, a relative position between the base station and the communication terminal, and a moving speed of the communication terminal; The base station according to claim 7.

9. the instruction means determines the second directivity based on the first directivity, a relative position between the base station and the communication terminal, a moving speed of the communication terminal, and a radio wave map showing radio wave conditions at each location. The base station according to claim 7.

10. and a communication control means for determining a communication method of the communication based on a relative position between the base station and the communication terminal based on the information and a moving speed of the communication terminal. A base station according to any one of claims 7 to 9.

11. An update means for updating the radio wave map is further provided, The information acquisition means further acquires information indicating a position and a reception power of the communication terminal from the communication terminal; The update means updates a radio wave map based on information indicating a position and a reception power of the communication terminal. A base station according to claim 7 or 8.

12. A communication system including a communication terminal and a base station, The communication terminal includes: An antenna unit capable of controlling directivity; an information acquisition means for controlling a directivity of the antenna unit to a first directivity and acquiring information indicating a position of the base station from the base station via the antenna unit; a communication control means for controlling a directivity of the antenna unit to a second directivity narrower than the first directivity and communicating with the base station via the antenna unit, the communication control means determines the second directivity based on a relative position between the base station and the communication terminal based on the information and a moving speed of the communication terminal; The base station includes an information output unit that outputs information indicating a position of the base station to the communication terminal. Communication systems.

13. A communication system including a communication terminal and a base station, The communication terminal includes: An antenna unit capable of controlling directivity; an information output means for outputting, to the base station, information indicating a first directivity of the antenna unit, a position of the communication terminal, and a moving speed of the communication terminal when the communication terminal is communicating with the base station; A reception means for receiving an instruction from the base station; a communication control means for controlling the directivity of the antenna unit in accordance with the instruction and communicating with the base station via the antenna unit, The base station, an information acquisition means for acquiring the information from the communication terminal; an instruction means for instructing the communication terminal to control a directivity of the antenna unit to a second directivity narrower than the first directivity and to communicate with the base station via the antenna unit; the instruction means determines the second directivity based on a relative position between the base station and the communication terminal based on the information and on a moving speed of the communication terminal. Communication systems.

14. A communication terminal including an antenna unit capable of controlling directivity, controlling a directivity of the antenna unit to a first directivity, and acquiring information indicating a position of the base station from the base station via the antenna unit; controlling a directivity of the antenna unit to a second directivity narrower than the first directivity, and communicating with the base station via the antenna unit; determining the second directivity based on a relative position between the base station and the communication terminal based on the information and a moving speed of the communication terminal in performing the communication; Communications control method.

15. On the computer, an information acquisition process of controlling a directivity of the antenna unit to a first directivity and acquiring information indicating a position of the base station from the base station via the antenna unit; a communication control process for controlling the directivity of the antenna unit to a second directivity narrower than the first directivity and communicating with the base station via the antenna unit; determining the second directivity based on a relative position between the base station and the communication terminal based on the information and a moving speed of the communication terminal in the communication control process; program.

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