JP7556566B2 - Wireless communication device, center of gravity control method, and center of gravity control program - Google Patents

Description

The present disclosure relates to a wireless communication device, a center of gravity control method, and a center of gravity control program.

Conventionally, various technologies have been proposed for improving the quality of wireless communication of wireless communication devices. As an example of such a technology, Patent Document 1 discloses a wireless LAN (Local Area Network) access point system. In this access point system, when the radio wave strength of a wireless terminal measured by the access point falls below a specified value, the wireless terminal and the wireless LAN access point each detect location information. The server calculates a position where the radio wave strength of the wireless terminal falls within an allowable range of radio wave strength as the moving location information of the access point. The access point is equipped with a moving unit that moves the access point along a rail, and is intended to improve the wireless LAN environment in a location where the wireless LAN environment has deteriorated by moving to a position indicated by the moving location information calculated by the server.

JP 2015-082667 A

However, the access point system disclosed in Patent Document 1 has a problem of low versatility because the locations where the access point can be moved are limited to positions along the rails.

In view of the above-mentioned problems, one of the objectives of the present disclosure is to provide a highly versatile wireless communication device, a center of gravity control method, and a center of gravity control program that can improve the quality of wireless communication of a wireless communication device.

A wireless communication device according to an embodiment includes:
a center-of-gravity changing mechanism for changing a center-of-gravity position of the wireless communication device;
A mechanism control unit that controls the center of gravity changing mechanism;
a radio wave intensity calculation unit that calculates an intensity of a first radio wave received by the wireless communication device from another wireless communication device and an intensity of a second radio wave received by the wireless communication device from the other wireless communication device after the first radio wave;
a radio wave intensity determination unit that determines whether the intensity of the second radio wave is smaller than the intensity of the first radio wave,
When the mechanism control unit determines that the strength of the second radio wave is smaller than the strength of the first radio wave, it controls the center of gravity changing mechanism to change the current center of gravity position of the wireless communication device to another predetermined center of gravity position.

The center of gravity control method according to one embodiment includes:
Calculating the intensity of a first radio wave received by the wireless communication device from another wireless communication device and the intensity of a second radio wave received by the wireless communication device from the other wireless communication device after the first radio wave;
determining whether the intensity of the second radio wave is less than the intensity of the first radio wave;
If it is determined that the strength of the second radio wave is smaller than the strength of the first radio wave, a step of controlling a center of gravity changing mechanism that changes the center of gravity position of the wireless communication device to change the current center of gravity position of the wireless communication device to another predetermined center of gravity position is executed.

A center of gravity control program according to an embodiment of the present invention includes:
Calculating the intensity of a first radio wave received by the wireless communication device from another wireless communication device and the intensity of a second radio wave received by the wireless communication device from the other wireless communication device after the first radio wave;
determining whether the intensity of the second radio wave is less than the intensity of the first radio wave;
If it is determined that the strength of the second radio wave is smaller than the strength of the first radio wave, a step of controlling a center of gravity changing mechanism that changes the center of gravity position of the wireless communication device to change the current center of gravity position of the wireless communication device to another predetermined center of gravity position is executed.

The present disclosure provides a highly versatile wireless communication device, a center of gravity control method, and a center of gravity control program that can improve the quality of wireless communication in a wireless communication device.

1 is a block diagram showing a configuration of a wireless communication device. FIG. 4 is a diagram illustrating an example of management information. FIG. 2 is a perspective view showing a center of gravity changing mechanism according to the first embodiment. 13 is a flowchart showing a process executed by the wireless communication device. 11A and 11B are diagrams illustrating a method for controlling the center of gravity position of a wireless communication device. 1 is a block diagram showing main components of a wireless communication device. FIG. 11 is a front view showing a center of gravity changing mechanism according to a second embodiment. 13 is a diagram showing a vertical cross section of a center of gravity changing mechanism according to a second embodiment. FIG.

First Embodiment
Hereinafter, the first embodiment will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a wireless communication device 1. Specific examples of the wireless communication device 1 include wireless communication devices such as an access point, a mobile router, a smartphone, a tablet terminal, a notebook PC, and a wearable terminal. The wireless communication device 1 can perform data communication with other wireless communication devices such as a wireless LAN slave via wireless communication such as a wireless LAN. For example, when the wireless communication device 1 is an access point, the other wireless communication device may be a wireless LAN slave or a router. Also, when the wireless communication device 1 is a mobile router, the other wireless communication device may be a base station or a wireless LAN slave. Also, when the wireless communication device 1 is a smartphone, a tablet terminal, a notebook PC, or a wearable terminal, the other wireless communication device may be a base station, a router, or an access point.

The wireless communication device 1 includes a control device 10, a center of gravity changing mechanism 20, a wireless communication interface 30, and a storage device 40. The control device 10 is a device that controls the devices and electronic circuits included in the wireless communication device 1. Specific examples of the control device 10 include semiconductor integrated devices such as a processor, an FPGA (Field-Programmable Gate Array), and an ASIC (Application Specific Integrated Circuit). Processors include a CPU (Central Processing Unit) and a RAM (Random Access Memory). The wireless communication device 1 and the control device 10 correspond to a computer.

The control device 10 executes a center of gravity control program according to an embodiment, thereby executing a center of gravity control method according to an embodiment. The center of gravity control program includes a radio wave intensity calculation unit 101, a radio wave intensity determination unit 102, a center of gravity position selection unit 103, a management information update unit 104, and a mechanism control unit 105.

The radio wave intensity calculation unit 101 is a program that calculates the intensity of a first radio wave received by the wireless communication device 1 and the intensity of a second radio wave received by the wireless communication device 1 after the first radio wave.

The radio wave strength determination unit 102 is a program that determines whether the strength of the second radio wave is smaller than the strength of the first radio wave.

The center of gravity position selection unit 103 is a program that selects one of the other predefined center of gravity positions other than the initial center of gravity position of the wireless communication device 1. The center of gravity position of the wireless communication device 1 corresponds to the position of the weight (hereinafter referred to as the "weight position") provided in the center of gravity change mechanism 20. The initial center of gravity position of the wireless communication device 1 corresponds to the initial weight position of the center of gravity change mechanism 20. The other predefined center of gravity position of the wireless communication device 1 corresponds to a predefined weight position other than the initial weight position. The center of gravity position selection unit 103 selects an unselected center of gravity position from among the predefined center of gravity positions based on management information indicating whether or not the center of gravity position of the wireless communication device 1 has been selected. When there are multiple predefined center of gravity positions, the center of gravity position selection unit 103 can select an unselected center of gravity position according to a predefined order. The center of gravity position selection unit 103 can also randomly select an unselected center of gravity position.

The management information update unit 104 is a program that updates the management information of the center of gravity position. FIG. 2 is a diagram showing an example of the management information. The management information includes management information for each predefined center of gravity position of the wireless communication device 1. As shown in FIG. 2, the management information indicates whether each predefined center of gravity position is selected.

The mechanism control unit 105 is a program that controls the center of gravity change mechanism 20 to change the center of gravity position of the wireless communication device 1. The center of gravity position of the wireless communication device 1 includes an initial center of gravity position and one or more predefined center of gravity positions other than the initial center of gravity position. The mechanism control unit 105 controls the center of gravity change mechanism 20 to change the current center of gravity position of the wireless communication device 1 to the initial center of gravity position or the predefined center of gravity position.

The center of gravity changing mechanism 20 is a mechanism that changes the center of gravity position of the wireless communication device 1. FIG. 3 is a perspective view showing the center of gravity changing mechanism 20 according to the first embodiment. The center of gravity changing mechanism 20 includes a weight 21, a plate 22, a support member 23, and an expandable member 24.

The center of gravity change mechanism 20 changes the center of gravity of the wireless communication device 1 by moving the weight 21. The center of gravity change mechanism 20 can change the center of gravity of the wireless communication device 1 from the initial center of gravity position to a predetermined center of gravity position by moving the weight 21 from the initial weight position to one of the predetermined weight positions WP1 to WP4 corresponding to the predetermined center of gravity position. The initial weight position is preferably a position to which the weight 21 can move in all directions on the plate 22, such as the center position of the plate 22. The predetermined weight positions WP1 to WP4 are preferably positions at which a user carrying the wireless communication device 1 can sense that the weight 21 has moved from a certain weight position to another weight position. The center of gravity change mechanism 20 can change the center of gravity of the wireless communication device 1 to the initial center of gravity position or another predetermined center of gravity position by moving the weight 21 from the current weight position to the initial weight position or one of the predetermined weight positions WP1 to WP4.

The weight 21 is a weight that can change the center of gravity of the wireless communication device 1. The weight 21 is placed on the plate 22 and can move on the plate 22. Note that although the center of gravity changing mechanism 20 shown in FIG. 3 has one weight, the center of gravity changing mechanism 20 may have multiple weights.

The plate 22 is a member on which the weight 21 is placed. The plate 22 is supported by the support member 23. The plate 22 can tilt with the support member 23 as a fulcrum. It is preferable that the support member 23 is attached to the center of gravity of the plate 22, for example, the center of the lower surface of the plate 22.

In addition, an expandable member 24 is attached to the end of the plate 22. Each expandable member 24 can expand and contract individually under the control of the mechanism control unit 105. As each expandable member 24 expands and contracts, the plate 22 tilts and the weight 21 moves to one of the weight positions WP1 to WP4 on the plate 22 that corresponds to the position of the center of gravity of the wireless communication device 1. As a result, the position of the center of gravity of the wireless communication device 1 is changed. In other words, the center of gravity change mechanism 20 changes the position of the center of gravity of the wireless communication device 1 by tilting the plate 22.

Note that while the planar shape of the plate 22 shown in FIG. 3 is a rectangle, in other embodiments, the planar shape of the plate 22 may be another polygon or a circle. Also, while four elastic members 24 are attached to the plate 22 shown in FIG. 3, any number of elastic members 24 may be attached to the plate 22. Furthermore, in the example shown in FIG. 3, the elastic members 24 are attached to the corners of the plate 22, but the elastic members 24 may be attached between each corner of the plate 22.

The wireless communication interface 30 is a device that performs wireless communication via an antenna (not shown). Wireless communication includes wireless LAN communication, Bluetooth (registered trademark) communication, and other communication. The wireless communication interface 30 includes a receiving circuit and a transmitting circuit. The receiving circuit receives various data from other wireless communication devices via the antenna and provides the data to the control device 10. The transmitting circuit transmits various data via the antenna under the control of the control device 10.

The storage device 40 is a storage device that stores various data such as the center of gravity control program of the present invention and management information for the center of gravity position of the wireless communication device 1.

Figure 4 is a flowchart showing the processing executed by the wireless communication device 1. In step S1, the wireless communication device 1 receives radio waves emitted by another wireless communication device. In step S2, the radio wave intensity calculation unit 101 calculates the intensity of the radio waves received in step S1. In step S3, the center of gravity position selection unit 103 selects one of the other predefined center of gravity positions other than the initial center of gravity position. In step S4, the mechanism control unit 105 controls the center of gravity change mechanism 20 to change the center of gravity position of the wireless communication device 1 to the center of gravity position selected in step S3.

In step S5, the wireless communication device 1 receives radio waves emitted by another wireless communication device. In step S6, the radio wave strength calculation unit 101 calculates the strength of the radio waves received in step S5. In step S7, the radio wave strength determination unit 102 determines whether the calculated strength of the subsequent radio waves is smaller than the calculated strength of the preceding radio waves. The strength of the preceding radio waves corresponds to the strength of the first radio waves. The strength of the subsequent radio waves corresponds to the strength of the second radio waves.

Specifically, when step S7 is executed for the first time, that is, in the first step S7, the radio wave strength determination unit 102 determines whether the strength of the subsequent radio wave calculated in step S6 is smaller than the strength of the preceding radio wave calculated in step S2. When step S7 is executed again, that is, in the Nth (N=integer equal to or greater than 2)th or subsequent step S7, the radio wave strength determination unit 102 determines whether the strength of the subsequent radio wave calculated in the Nth step S6 is smaller than the strength of the preceding radio wave calculated in the N-1th step S6.

If the strength of the subsequent radio wave is equal to or greater than the strength of the preceding radio wave (NO), the process returns to step S5. On the other hand, if it is determined that the strength of the subsequent radio wave is less than the strength of the preceding radio wave (YES), the process branches to step S8.

In step S8, the management information update unit 104 updates the management information of the selected center of gravity position. In step S9, the center of gravity position selection unit 103 refers to the management information of the center of gravity position and determines whether or not there is a center of gravity position that has not yet been selected. If there is a center of gravity position that has not yet been selected (YES), in step S10, the center of gravity position selection unit 103 refers to the management information of the center of gravity position and selects one from the center of gravity positions that have not yet been selected. In step S11, the mechanism control unit 105 controls the center of gravity change mechanism 20 to change the center of gravity position of the wireless communication device 1 to the center of gravity position selected in step S10, and the process returns to step S5.

On the other hand, if there is no center of gravity position that has not yet been selected in step S9 (NO), in step S12 the mechanism control unit 105 controls the center of gravity change mechanism 20 to change the center of gravity position of the wireless communication device 1 to the initial center of gravity position, and the processing in FIG. 4 ends. In other words, after the center of gravity position of the wireless communication device 1 has been changed to all of the default center of gravity positions, when the strength of the subsequent radio wave becomes smaller than the strength of the preceding radio wave, the mechanism control unit 105 controls the center of gravity change mechanism 20 to return the current center of gravity position of the wireless communication device 1 to the initial center of gravity position.

Figure 5 is a diagram showing a method for controlling the center of gravity position of the wireless communication device 1. Figure 5 shows the plan view of the weight 21 and the plate 22. In this embodiment, as shown in the upper left of Figure 5, before the center of gravity position of the wireless communication device 1 is changed, the weight 21 is placed at the center position of the plate 22, which is the initial weight position. The center of gravity position of the wireless communication device 1 at this time corresponds to the initial center of gravity position.

Next, the mechanism control unit 105 controls the center of gravity changing mechanism 20 to move the weight 21 to weight position WP4 corresponding to the fourth center of gravity position. At this time, the user carrying the wireless communication device 1 can understand that the weight 21 has moved from the initial weight position to weight position WP4, i.e., that the center of gravity of the wireless communication device 1 has changed from the initial center of gravity position to the fourth center of gravity position. The user can move according to the changed center of gravity position.

When the strength RSSI of the radio waves received by the wireless communication device 1 from other wireless communication devices decreases from -80 dBm to -85 dBm as a result of the user continuing to move, the mechanism control unit 105 controls the center of gravity change mechanism 20 to move the weight 21 to weight position WP1 corresponding to the first center of gravity position. At this time, the user carrying the wireless communication device 1 can understand that the weight 21 has moved from weight position WP4 to weight position WP1, i.e., that the center of gravity of the wireless communication device 1 has changed from the fourth center of gravity position to the first center of gravity position. The user can move according to the changed center of gravity position.

If the user continues to move and the radio wave strength RSSI increases from -85 dBm to -70 dBm, the mechanism control unit 105 does not change the center of gravity position of the wireless communication device 1. If the user then moves further and the radio wave strength RSSI decreases from -70 dBm to -75 dBm, the mechanism control unit 105 controls the center of gravity changing mechanism 20 to move the weight 21 to weight position WP3 corresponding to the third center of gravity position. At this time, the user carrying the wireless communication device 1 can understand that the weight 21 has moved from weight position WP1 to weight position WP3, i.e., that the center of gravity of the wireless communication device 1 has changed from the first center of gravity position to the third center of gravity position. The user can move according to the changed center of gravity position.

If the user continues to move and the radio wave strength RSSI decreases from -75 dBm to -80 dBm, the mechanism control unit 105 controls the center of gravity changing mechanism 20 to move the weight 21 to weight position WP2 corresponding to the second center of gravity position. At this time, the user carrying the wireless communication device 1 can understand that the weight 21 has moved from weight position WP3 to weight position WP2, i.e., that the center of gravity of the wireless communication device 1 has changed from the third center of gravity position to the second center of gravity position. The user can move according to the changed center of gravity position.

If the radio wave strength RSSI increases from -80 dBm to -40 dBm as the user continues to move, the mechanism control unit 105 does not change the center of gravity position of the wireless communication device 1. If the radio wave strength RSSI subsequently decreases from -40 dBm to -45 dBm as the user continues to move, the mechanism control unit 105 controls the center of gravity changing mechanism 20 to move the weight 21 to an initial weight position corresponding to the initial center of gravity position. At this time, the user carrying the wireless communication device 1 can understand that the weight 21 has moved from weight position WP2 to the initial weight position, i.e., that the center of gravity of the wireless communication device 1 has changed from the second center of gravity position to the initial center of gravity position, and can stop the movement.

Figure 6 is a block diagram showing the main components of the wireless communication device 1. The wireless communication device 1 includes a radio wave intensity calculation unit 101, a radio wave intensity determination unit 102, a mechanism control unit 105, and a center of gravity change mechanism 20. The radio wave intensity calculation unit 101 calculates the intensity of a first radio wave received by the wireless communication device 1 from another wireless communication device, and the intensity of a second radio wave received by the wireless communication device 1 from the other wireless communication device after the first radio wave. The radio wave intensity determination unit 102 determines whether the intensity of the second radio wave is smaller than the intensity of the first radio wave. If the mechanism control unit 105 determines that the intensity of the second radio wave is smaller than the intensity of the first radio wave, it controls the center of gravity change mechanism 20 to change the current center of gravity position of the wireless communication device 1 to another predetermined center of gravity position.

When a user carrying wireless communication device 1 moves according to the changed center of gravity position of wireless communication device 1, the strength of the radio waves received by wireless communication device 1 from the other wireless communication device changes as the distance between the other wireless communication device, which is the source of the radio waves, and wireless communication device 1 changes. If the strength of the radio waves received by wireless communication device 1 increases as the user moves, the center of gravity position of wireless communication device 1 does not change, so the user continues moving in the same direction.

On the other hand, when the strength of the radio waves received by the wireless communication device 1 from the other wireless communication device becomes weaker, the center of gravity of the wireless communication device 1 is changed to another center of gravity. The user then moves according to the changed center of gravity of the wireless communication device 1. By repeating the change in the center of gravity of the wireless communication device 1 and the movement of the user in this manner, it is possible to guide the user to a position where the strength of the radio waves received by the wireless communication device 1 from the other wireless communication device is stronger than in the initial state. As a result, it is possible to improve the quality of wireless communication between the wireless communication device 1 and the other wireless communication device.

In particular, when an access point in wireless LAN communication is adopted as the wireless communication device 1, the access point can guide the user to a position where the radio wave intensity received from other wireless communication devices such as client devices and routers is stronger than in the initial state. This can improve the quality of wireless communication between the access point and other wireless communication devices.

In addition, in the above-described embodiment, after the center of gravity position of the wireless communication device 1 has been changed to all of the preset center of gravity positions, when the strength of the second radio wave becomes smaller than the strength of the first radio wave, the mechanism control unit 105 controls the center of gravity change mechanism 20 to return the current center of gravity position of the wireless communication device 1 to the initial center of gravity position. This allows a user carrying the wireless communication device 1 to recognize that the center of gravity position of the wireless communication device 1 has returned to the initial center of gravity position, and can understand that the wireless communication device 1 has arrived at a position where the strength of the radio wave received from another wireless communication device is greater than in the initial state.

The center-of-gravity control program includes instructions (or software code) that, when loaded into a computer, cause the computer to perform one or more functions described in the embodiments. The program may be stored on a non-transitory computer-readable medium or a tangible storage medium. By way of example and not limitation, computer-readable media or tangible storage media include random-access memory (RAM), read-only memory (ROM), flash memory, solid-state drive (SSD) or other memory technology, CD-ROM, digital versatile disk (DVD), Blu-ray (registered trademark) disk or other optical disk storage, magnetic cassette, magnetic tape, magnetic disk storage or other magnetic storage device. The center-of-gravity control program may be transmitted on a temporary computer-readable medium or communication medium. By way of example and not limitation, the temporary computer-readable medium or communication medium includes electrical, optical, acoustic, or other form of propagated signal.

Second Embodiment
In the second embodiment, the wireless communication device 1 has a spherical shape and can roll by changing the position of the center of gravity of the wireless communication device 1. The second embodiment will be described below, focusing on the differences from the first embodiment.

Figure 7 is a front view showing the center of gravity change mechanism 200 provided in the spherical wireless communication device 1 according to the second embodiment. As shown in Figure 7, the center of gravity change mechanism 200 includes a support member 23, an expandable member 24, a storage section 25, and a transport path 26. Note that the appearance of the center of gravity change mechanism 200 when viewed from the back and side is the same as that shown in Figure 7.

The storage section 25 is a member in which a weight is stored. The support member 23 and the expandable member 24 are connected to the storage section 25. The storage section 25 can tilt around the connection between the storage section 25 and the support member 23 as a fulcrum by the expandable member 24 expanding and contracting under the control of the mechanism control section 105.

The transport path 26 has a transport means such as a roller motor inside, and transports the weight that has been moved to the preset weight position toward the initial weight position. Although three transport paths 26 are shown in FIG. 7, the center of gravity changing mechanism 200 has a number of transport paths 26 corresponding to the number of preset weight positions other than the initial weight position. In this embodiment, it is preferable that the initial weight position is the position of the connection between the storage section 25 and the support member 23.

Figure 8 is a diagram showing a vertical cross section of the center of gravity changing mechanism 200 according to the second embodiment. When the mechanism control unit 105 tilts the storage unit 25, the weight in the storage unit 25 moves to a default weight position corresponding to the center of gravity position selected by the center of gravity position selection unit 103. As a result, the center of gravity position of the wireless communication device 1 changes to the default weight position corresponding to the selected center of gravity position, and the wireless communication device 1 starts to roll in a direction corresponding to the selected center of gravity position. Specifically, the wireless communication device 1 moves in the direction of a straight line connecting the initial weight position and the default weight position to which the weight 21 has moved.

Next, when the weight 21 enters the transport path 26, the transport path 26 transports the weight 21 toward the initial weight position WP0. When the weight 21 is transported out of the transport path 26, the weight 21 moves again to the default weight position corresponding to the center of gravity position selected by the center of gravity position selection unit 103.

The transport time from when the weight 21 enters the inside of the transport path 26 until it is transported out of the transport path 26 can be determined based on the rotation period of the wireless communication device 1. For example, the time required for the wireless communication device 1 to rotate once can be adopted as the transport time of the weight 21. As the wireless communication device 1 rotates, the center of gravity change mechanism 200 also rotates. Therefore, by adopting the time required for the wireless communication device 1 to rotate once as the transport time of the weight 21, the tilt state of the center of gravity change mechanism 200 as viewed from outside the wireless communication device 1 becomes the same before and after the weight 21 is transported by the transport path 26. As a result, the spherical wireless communication device 1 can rotate smoothly in the direction corresponding to the center of gravity position selected by the center of gravity position selection unit 103.

The present invention is not limited to the above-described embodiment, and can be modified as appropriate without departing from the spirit of the present invention.

1 Wireless communication device 10 Control device 101 Radio wave intensity calculation unit 102 Radio wave intensity determination unit 103 Center of gravity position selection unit 104 Management information update unit 105 Mechanism control unit 20, 200 Center of gravity change mechanism 21 Weight 22 Plate 23 Support member 24 Expandable member 25 Storage unit 26 Transport path 30 Wireless communication interface 40 Storage device WP0 to WP4 Weight position

Claims (8)

1. A wireless communication device, comprising:
a center-of-gravity changing mechanism for changing a center-of-gravity position of the wireless communication device;
A mechanism control unit that controls the center of gravity changing mechanism;
a radio wave intensity calculation unit that calculates an intensity of a first radio wave received by the wireless communication device from another wireless communication device and an intensity of a second radio wave received by the wireless communication device from the other wireless communication device after the first radio wave;
a radio wave intensity determination unit that determines whether the intensity of the second radio wave is smaller than the intensity of the first radio wave,
when it is determined that the intensity of the second radio wave is smaller than the intensity of the first radio wave, the mechanism control unit controls the center of gravity changing mechanism to change the current center of gravity position of the wireless communication device to another predetermined center of gravity position.
Wireless communication device. The wireless communication device according to claim 1, wherein the mechanism control unit controls the center of gravity change mechanism to return the current center of gravity position of the wireless communication device to the initial center of gravity position when the strength of the second radio wave becomes smaller than the strength of the first radio wave after the center of gravity position of the wireless communication device has been changed to all of the preset center of gravity positions. The center of gravity changing mechanism includes at least one weight,
The wireless communication device according to claim 1 or 2, wherein the mechanism control unit changes the center of gravity position of the wireless communication device to the predetermined center of gravity position by moving the weight to a predetermined weight position corresponding to a predetermined center of gravity position. the center-of-gravity changing mechanism includes a plate on which the weight is placed,
4. The wireless communication device according to claim 3, wherein the mechanism control unit tilts the plate to move the weight to a predetermined weight position corresponding to the predetermined center of gravity position, thereby changing the center of gravity position of the wireless communication device to the predetermined center of gravity position. a center-of-gravity position selection unit that selects an unselected center-of-gravity position from among preset center-of-gravity positions based on management information indicating whether a center-of-gravity position of the wireless communication device has been selected;
3. The wireless communication device according to claim 1, wherein when the mechanism control unit determines that the strength of the second radio wave is smaller than the strength of the first radio wave, the mechanism control unit controls the center of gravity changing mechanism to change the current center of gravity position of the wireless communication device to the center of gravity position selected by the center of gravity position selection unit. the wireless communication device is spherical in shape;
The center of gravity changing mechanism includes:
A storage section in which the weight is stored;
a conveying path for conveying the weight that has been moved to the predetermined weight position toward an initial weight position,
The wireless communication device according to claim 3 , wherein the mechanism control unit tilts the storage unit to move the weight to a predetermined weight position corresponding to the predetermined center of gravity position, thereby changing the center of gravity position of the wireless communication device to the predetermined center of gravity position. The computer
Calculating the intensity of a first radio wave received by a wireless communication device from another wireless communication device and the intensity of a second radio wave received by the wireless communication device from the other wireless communication device after the first radio wave;
determining whether the intensity of the second radio wave is less than the intensity of the first radio wave;
and if it is determined that the strength of the second radio wave is smaller than the strength of the first radio wave, controlling a center of gravity change mechanism that changes the center of gravity position of the wireless communication device to change the current center of gravity position of the wireless communication device to another predetermined center of gravity position. For computers,
Calculating the intensity of a first radio wave received by a wireless communication device from another wireless communication device and the intensity of a second radio wave received by the wireless communication device from the other wireless communication device after the first radio wave;
determining whether the intensity of the second radio wave is less than the intensity of the first radio wave;
and if it is determined that the intensity of the second radio wave is smaller than the intensity of the first radio wave, controlling a center of gravity change mechanism that changes the center of gravity position of the wireless communication device to change the current center of gravity position of the wireless communication device to another predetermined center of gravity position.

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