Mobile body and wireless communication device

Abstract

To provide a technique that acquires surrounding communication quality and enables control based on the surrounding communication quality.SOLUTION: A mobile body includes a wireless communication unit and a control unit. The control unit executes: receiving a communication quality message including location information and communication quality information at a location indicated by the location information from a plurality of other mobile bodies by the wireless communication unit; determining a destination based on the communication quality message; and presenting information about the destination to a user.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to mobile and wireless communication devices. [Background technology]

[0002] Patent Document 1 discloses that an autonomous mobile device creates a communication quality map while moving and uses it for route search. However, this method only allows the autonomous mobile device to grasp the communication quality of the position where it has traveled, and it is not possible to control the communication quality of the surrounding area. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2017-167625 A Summary of the Invention [Problem to be solved by the invention]

[0004] One aspect of the present disclosure aims to provide a mobile object and a wireless communication device that can more appropriately acquire surrounding communication quality and use it for control. [Means for solving the problem]

[0005] One aspect of the present disclosure is A mobile object including a wireless communication unit and a control unit, The control unit is receiving, by the wireless communication unit, communication quality messages from a plurality of other moving objects, the communication quality messages including location information and communication quality information at the locations indicated by the location information; determining a destination based on the communication quality message; presenting information about the destination to a user; and The mobile object is characterized by executing the above.

[0006] Another aspect of the present disclosure is A mobile object including a wireless communication unit and a control unit, The control unit is receiving, by the wireless communication unit, communication quality messages from a plurality of other moving objects, the communication quality messages including location information and communication quality information at the locations indicated by the location information; generating a communication quality map for each location based on the communication quality messages; searching for a route to a destination based on the communication quality map, and presenting the route to a user or moving along the route; The mobile object is characterized by executing the above.

[0007] Yet another aspect of the present disclosure is receiving communication quality information from a plurality of other wireless communication devices; selecting at least one wireless communication device from among the plurality of other wireless communication devices based on the communication quality information; requesting the selected other wireless communication device to relay communication via a base station; The wireless communication device includes a control unit that executes the above. Effect of the Invention

[0008] A mobile object or a wireless communication device can obtain the surrounding communication quality and use it for control. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram for explaining an outline of a system according to an embodiment. [Diagram 2] 1 is a diagram showing a configuration of a vehicle (moving object) according to an embodiment. [Diagram 3] 4 is a flowchart of a communication quality acquisition process performed by a vehicle in an embodiment. [Figure 4] 5 is a flowchart showing the flow of a destination determination process in the first embodiment. [Diagram 5] 10 is a flowchart showing the flow of a route search process in the second embodiment. [Figure 6] 13 is a flowchart showing the flow of a communication relay process in the third embodiment. [Figure 7] 13 is a flowchart showing a modified example of the flow of communication relay processing in the third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] (overview) In recent years, wireless communication has become capable of transmitting and receiving large amounts of data. For example, the 5G communication standard is said to enable high-speed, high-capacity communication of 10 Gbps or more. However, the communication quality of wireless communication varies from location to location, and it is desirable to be in a location with good communication quality in order to perform high-speed, high-capacity wireless communication. Here, it is conceivable to obtain a location with good communication quality based on a map that represents statistical communication quality, but since communication quality also varies over time, it is not necessarily possible to obtain a location with good communication quality at that time. In addition, it is conceivable to create a communication quality map by having a device move while measuring communication quality, but this method does not allow for understanding of communication quality at locations that the device has not experienced, and furthermore, past communication quality does not necessarily match the current communication quality.

[0011] Therefore, an object of the present disclosure is to obtain the surrounding communication quality and perform control based on this.

[0012] The present disclosure includes, for example, an aspect of determining a location with good communication quality and presenting the location or a route to the location. The present disclosure also includes, for example, an aspect of searching for a route that passes through a location with good communication quality when searching for a route to a destination. The present disclosure also includes, for example, an aspect of requesting a device that is in a location with good communication quality to relay communication.

[0013] One aspect of the present disclosure is a mobile body having a wireless communication unit and a control unit, wherein the control unit receives, via the wireless communication unit, a communication quality message from a plurality of other mobile bodies, the communication quality message including location information and communication quality information at a location indicated by the location information, determines a destination based on the communication quality message, and presents information regarding the destination to a user.

[0014] In this aspect, the control unit may determine the location where the communication quality is equal to or higher than a predetermined standard as the destination. A typical example of the information about the destination is information about the location of the destination, more specifically, the location of the destination itself or a route to the destination.

[0015] According to this aspect, the user of the mobile body can know a location with good communication quality. For example, when performing large-volume communication, if the user can know a location with good communication quality, the user can move the mobile body to that location and then perform communication, thereby realizing large-volume communication.

[0016] Another aspect of the present disclosure is a mobile body having a wireless communication unit and a control unit, wherein the control unit receives, via the wireless communication unit, communication quality messages from a plurality of other mobile bodies, the communication quality messages including location information and communication quality information at a location indicated by the location information; generates a communication quality map for each location based on the communication quality messages; and searches for a route to a destination based on the communication quality map, and presents the route to a user or moves according to the route.

[0017] In this aspect, the control unit may preferentially search for a route whose communication quality is equal to or higher than a predetermined standard based on the communication quality map. Note that it is not necessary for the communication quality of the entire route to be equal to or higher than the predetermined standard, and a route including a portion with poor communication quality may be searched for as long as the communication quality of the entire communication route satisfies the predetermined standard. Also, it is not necessary for the communication quality of the entire route to be equal to or higher than the predetermined standard, and a route whose communication quality satisfies the predetermined standard during a predetermined period (for example, a period during which high-volume communication is predicted to occur) may be searched for.

[0018] In this aspect, the destination may be input by the user, or the control unit may determine the destination based on communication quality information received from other mobile objects or a communication quality map created based on the communication quality information.

[0019] Yet another aspect of the present disclosure is a wireless communication device including a control unit that receives communication quality information from a plurality of other wireless communication devices, selects at least one wireless communication device from among the plurality of other wireless communication devices based on the communication quality information, and requests the selected other wireless communication device to relay communication via a base station.

[0020] According to this aspect, by performing communication via another wireless communication device that is located in a position with good communication quality, the wireless communication device is able to perform large-volume communication without moving to a position with good communication quality.

[0021] In the present disclosure, communication quality may be, for example, received radio wave strength, reception quality, signal-to-interference-plus-noise ratio, or communication throughput.

[0022] The present disclosure further includes a computer program for causing a computer to execute each step of the above method, and a computer program for implementing the above network node or information processing system using a computer. The present disclosure further includes a computer-readable medium having the above computer program recorded thereon.

[0023] (Embodiment 1) Hereinafter, an embodiment of the present disclosure will be described based on the drawings. The following embodiment is merely an example for explanation, and the present disclosure is not limited to the configuration of the embodiment. For example, an example using mobile communication, particularly mobile communication of the 5G standard, will be described below, but mobile communication other than the 5G standard or wireless communication other than mobile communication may be used.

[0024] <System Overview> 1 is a diagram illustrating an overview of a system according to the present embodiment. The system includes a plurality of vehicles 100A to 100D. In the following, the vehicles will be collectively referred to as vehicle 100 when there is no need to distinguish between the individual vehicles.

[0025] Vehicle 100 has a wireless communication device compatible with mobile communications (e.g., 5G) and is capable of communication via base station 200 and a 5G core system (5GCS) and direct communication between vehicles 100 via a side link (SL).

[0026] Here, it is assumed that vehicle 100A is planning to carry out large-volume communication, but the current radio wave environment is not good, and vehicle 100A wants to move to a location with a better radio wave environment and therefore better communication quality to carry out large-volume communication. Therefore, vehicle 100A obtains communication quality information from surrounding vehicles 100B to 100D, moves to a location with better communication quality, and carries out large-volume communication.

[0027] <Configuration> 2 is a diagram showing an example of the configuration of the vehicle 100. The vehicle 100 includes a control unit 110, a wireless communication unit 120, and a GPS device .

[0028] The control unit 110 has a CPU 111 and a storage unit 112, and realizes functions described below by the CPU 111 executing a computer program loaded into the storage unit 112. There may be only one CPU 111 or there may be multiple CPUs 111, and one CPU may have multiple cores. The control unit 110 may have other processors such as a GPU or a DSP in addition to the CPU. The storage unit 112 includes a volatile memory such as a RAM, and a non-volatile memory such as an SSD, an HDD, or a flash memory. The control unit 110 can be regarded as an information processing device or a computer.

[0029] The wireless communication unit 120 is, for example, a communication device compatible with a mobile communication standard, and includes a signal oscillator, a modulator / demodulator, an amplifier, an antenna, etc. The wireless communication unit 120 is compatible with, for example, a 5G communication standard, and is capable of communication via a base station (gNB) 200 and direct communication with other vehicles 100 via a side link (SL).

[0030] The GPS device 130 is a device that performs positioning based on GPS satellite signals, and is capable of acquiring the current position of the vehicle 100 .

[0031] <Processing> 3 is a flowchart showing the flow of communication quality acquisition processing periodically performed by the vehicle 100. This processing can be performed at regular time intervals (for example, 1 second, 5 seconds, 10 seconds, 30 seconds, 1 minute, etc.), but may also be performed every time a certain distance is traveled or every time a predetermined trigger occurs.

[0032] In step S301, the control unit 110 acquires the current communication quality. The communication quality may be the received radio wave strength (e.g., Reference Signal Received Power (RSRP)), the reception quality (e.g., Reference Signal Received Quality (RSRQ)), or the signal-to-interference-plus-noise ratio (SINR) obtained from the wireless communication unit 120, or may be the end-to-end communication throughput that the control unit 110 can grasp.

[0033] In step S302, the control unit 110 acquires location information of the current location from the GPS device 130. Note that the location information may be acquired from a sensor other than the GPS device 130, or by analyzing a camera image, or the like.

[0034] In step S303, control unit 110 stores in storage unit 112 the communication quality acquired in step S301 and the location information acquired in step S30 in association with each other.

[0035] 4 is a flowchart showing the flow of processing executed by vehicle 100A when performing large volume communication. In the following description, it is expressed that vehicle 100 executes the processing, but more accurately, control unit 110 of vehicle 100 executes the processing.

[0036] 4 is started when a request for high-volume communication occurs in the vehicle 100A in step S401. Note that a request for high-volume communication includes a case where communication is scheduled to start after a predetermined time, in addition to a case where communication is immediately started.

[0037] In step S402, the vehicle 100A transmits a request message requesting communication quality information to the surrounding vehicles 100B to 100D via the wireless communication unit 120. The request message may include an identifier of the vehicle 100A and a current position of the vehicle 100A. In an embodiment, this request message is transmitted by sidelink communication, but may also be transmitted by communication via base station 200.

[0038] In step S403, in response to receiving the request message, the vehicles 100B to 100D transmit the communication quality information stored in the storage unit 112 to the vehicle 100A. More specifically, the vehicles 100B to 100D transmit to the vehicle 100A a communication quality message including the location information stored in the storage unit 112 and the communication quality information at the location indicated by the location information. The communication quality information to be transmitted may be only the most recent measurement result, or may be a plurality of measurement results within a most recent predetermined period, or may be a measurement result within a predetermined area (for example, within a predetermined distance from the current location of the vehicle 100A).

[0039] In step S404, the vehicle 100A determines a location with high communication quality as the destination based on the obtained communication quality information. At this time, the vehicle 100A may determine the destination using communication quality information measured by itself. In the present disclosure, "high communication quality" may mean, for example, that the communication quality meets a predetermined standard. The "predetermined standard" may be any standard that meets the communication quality required by the vehicle 100A. For example, conditions such as a received radio wave strength of a predetermined strength or more, a reception quality of a predetermined value or more, a signal-to-interference-and-noise ratio of a predetermined value or more, and a communication throughput of a predetermined value or more may be adopted. In addition, when there are multiple locations that meet the predetermined standard, the destination may be determined based on other factors such as the distance from the current position of the vehicle 100A. In addition, the vehicle 100A may present candidates for the destination to the user of the vehicle 100A and leave the final decision to the user.

[0040] In step S405, the vehicle 100A searches for a route from the current location to the destination determined in step S404, and presents the obtained route to the user in step S406. When the user decides to adopt the route, the vehicle 100A starts guidance according to this route. Note that, when multiple destinations are obtained in step S404, the route for each destination may be presented to the user, and the user may select which destination and route to adopt. In addition, when the vehicle 100A is an autonomous vehicle, the route may be changed or determined after obtaining the user's confirmation, or may be changed or determined without obtaining the user's confirmation.

[0041] <Advantageous Effects> According to this embodiment, it is possible to grasp locations with good communication quality, including locations where the vehicle is not traveling, and to move to those locations and perform large-volume communication. The same thing can be achieved by using a communication quality map created based on statistical communication quality, but since communication quality changes over time, the communication quality shown in the map is not necessarily accurate. In this embodiment, the communication quality obtained by the most recent measurement is used, so more accurate information can be grasped.

[0042] (Embodiment 2) In the first embodiment, the destination is determined based on communication quality information, but in the present embodiment, the destination is assumed to be given and a route to the destination is determined based on communication quality information obtained from surrounding vehicles.

[0043] The overall configuration of the system (FIG. 1), the configuration of the vehicle 100 (FIG. 2), and the flow of the process of acquiring communication quality information in the vehicle 100 (FIG. 3) are similar to those in the first embodiment, and therefore will not be described.

[0044] FIG. 5 is a flowchart showing the flow of the process executed when the vehicle 100A starts moving to the destination.

[0045] In step S501, the vehicle 100A receives a route search request from a user to a destination. By receiving the signal, the process of Fig. 5 is started. Note that the process of Fig. 5 may be executed while traveling along the determined route.

[0046] In step S502, the vehicle 100A transmits a request message requesting communication quality information to the surrounding vehicles 100B to 100D via the wireless communication unit 120. The request message may include an identifier of the vehicle 100A and a current location of the vehicle 100A. In this embodiment, the request message is transmitted by sidelink communication, but may also be transmitted by communication via the base station 200.

[0047] In step S503, in response to receiving the request message, the vehicles 100B to 100D transmit the communication quality information stored in the storage unit 112 to the vehicle 100A. More specifically, the vehicles 100B to 100D transmit to the vehicle 100A a communication quality message including the location information stored in the storage unit 112 and the communication quality information at the location indicated by the location information. The communication quality information to be transmitted may be only the most recent measurement result, or may be multiple measurement results within a most recent predetermined period, or may be measurement results within a predetermined area (for example, within a predetermined distance from the current location of the vehicle 100A).

[0048] In step S504, the vehicle 100A generates a communication quality map from the obtained communication quality information. The communication quality map is a map that indicates the communication quality for each position or each road.

[0049] In step S505, the vehicle 100A searches for a route to the destination, taking into consideration the communication quality on the route, based on the created communication quality map. A route search taking into consideration communication quality is, for example, a search that preferentially searches for a route whose communication quality is equal to or higher than a predetermined standard, and excludes a route that does not meet the predetermined standard. Such a search can be realized by setting a large travel cost for roads that do not meet the predetermined standard. Note that various methods are assumed as the route search criteria. For example, a method based on the average communication quality of the entire route, or a method of searching for a route that does not pass through a place where the communication quality is below the standard. The former is effective when a predetermined amount of communication is performed, and the latter is effective when continuous communication is performed. Note that, if the time period during which communication quality needs to be ensured is known in advance, a route search taking into consideration communication quality may be performed only for that time period.

[0050] The route obtained in step S506 is presented to the user. When the user decides to adopt the route, the vehicle 100A starts guidance according to the route. In addition, if the vehicle 100A is an autonomous vehicle, the route may be changed or determined after obtaining the user's confirmation, or may be changed or determined without obtaining the user's confirmation.

[0051] <Advantageous Effects> According to this embodiment, it is possible to grasp locations with good communication quality, including locations where the vehicle is not traveling, and based on that, a route with good communication quality to the destination can be presented. The user can experience good communication services because the user travels along a route with good communication quality throughout the entire journey to the destination (or for a necessary period of that time).

[0052] (Embodiment 3) In the first and second embodiments, examples are given in which a mobile object moves to a position with good communication quality and moves through a position with good communication quality in consideration of the surrounding communication quality. In the present embodiment, it is proposed that the device itself does not move, but that communication is performed via a wireless communication device that is located in a position with good communication quality.

[0053] The overall configuration of the system in this embodiment is as shown in FIG. 1, similarly to the first and second embodiments, but instead of a vehicle, a user terminal (wireless communication device) is a component of the system. However, the user terminal may be mounted on a vehicle or other moving object. Alternatively, the user terminal may be in a form carried by a person, or may be fixed in one place. In other words, the user terminal in this embodiment may be mobile or immobile.

[0054] The user terminal in this embodiment includes a control unit 110, a wireless communication unit 120, and a GPS device 130, similar to the vehicle 100 shown in Fig. 2. Note that a user terminal having these components can be regarded as a wireless communication device.

[0055] The flow of the process of acquiring communication quality information in the user terminal in this embodiment (FIG. 3) is similar to that in the first embodiment, and therefore a description thereof will be omitted.

[0056] 6 is a flowchart showing the flow of processing executed by a user terminal when performing large-volume communication. In the following description, it is expressed that the user terminal performs the processing, but more accurately, it is the control unit 110 of the user terminal that performs the processing.

[0057] The process of Fig. 6 starts when a request for high-volume communication occurs in the user terminal in step S601. A request for high-volume communication includes a case where communication is scheduled to start after a predetermined time, in addition to a case where communication is started immediately. The need for high-volume communication is merely one example of a trigger for this process, and the start of any other communication may be used as a trigger for this process.

[0058] In step S602, user terminal A transmits a Relay Discovery Solicitation message to surrounding user terminals via the wireless communication unit 120. The relay discovery solicitation message in this embodiment includes a parameter requesting communication quality information. The relay discovery solicitation message may include an identifier of user terminal A and a current location of user terminal A. In this embodiment, this relay discovery solicitation message is transmitted by sidelink communication, but may also be transmitted by communication via base station 200.

[0059] In step S603, user terminals B to D determine whether or not they can relay communications from other user terminals, and if so, transmit a Relay Discovery Response message to user terminal A. The Relay Discovery Response message includes communication quality information. More specifically, the communication quality information includes location information and the communication quality at the location indicated by the location information. The communication quality information to be transmitted may be only the most recent measurement result, or may be a plurality of measurement results within a most recent predetermined period, or may be measurement results within a predetermined area (for example, within a predetermined distance from the current location of user terminal A). The Relay Discovery Response message can also be considered as a communication quality message.

[0060] In step S604, the user terminal A determines, as a relay terminal, a user terminal capable of relaying and having good communication quality from the communication quality information included in the relay discovery response message. In the present disclosure, "high communication quality" may mean, for example, that the communication quality meets a predetermined standard. The "predetermined standard" may be any standard as long as it is equal to or higher than the communication quality required by the user terminal A. For example, conditions such as a received radio wave strength of a predetermined strength or higher, a received quality of a predetermined value or higher, a signal-to-interference-and-noise ratio of a predetermined value or higher, and a communication throughput of a predetermined value or higher may be adopted. In addition, when there are multiple user terminals that meet the predetermined standard, the relay terminal may be determined based on other factors such as the distance from the current location of the user terminal A. In addition, the user terminal A may present candidates for relay terminals to the user of the user terminal A and leave the final decision to the user.

[0061] In step S605, the user terminal A determines to relay communication via the base station 200. In step S606, the relay terminal responds to the relay request by transmitting the requested communication to the base station 200. When the relay terminal receives a response from the base station 200 to user terminal A, it transmits the response to user terminal A.

[0062] 7 is a flowchart showing a process flow according to a modification of this embodiment. In this embodiment, each user terminal transmits a Relay Discovery Announcement message to surroundings when communication relay is possible (step S701). The Relay Discovery Announcement message includes communication quality information. The communication quality information to be transmitted may be only the most recent measurement result, or may be a plurality of measurement results within a most recent predetermined period. This Relay Discovery Announcement message is transmitted by sidelink communication, but may also be transmitted by communication via base station 200.

[0063] When a request for large-volume communication occurs in step S702, user terminal A determines a relay terminal based on the relay discovery announce message received in step S704. Note that user terminal A may determine a relay terminal based on a relay discovery announce message received after the request for large-volume communication occurs. The selection criteria for the relay terminal are the same as above. Also, the processing in steps S704 to S706 is the same as the processing in steps S604 to S606, and therefore description thereof will be omitted.

[0064] <Advantageous Effects> According to this embodiment, by performing communication via another wireless communication device located in a position with good communication quality with the base station, the wireless communication device can perform large-volume communication without moving to a position with good communication quality. In addition, load distribution that distributes the communication load of each user terminal is possible. In particular, efficient load distribution is possible by selecting a user terminal with high communication throughput as a communication quality as a relay terminal.

[0065] (Other variations) The above-described embodiment is merely an example, and the present disclosure can be modified and implemented as appropriate without departing from the spirit and scope of the present disclosure.

[0066] In the above embodiment, an example is shown in which 5G mobile communication (communication via a base station and sidelink communication) is used, but any standard of communication may be adopted as long as it is wide-area wireless communication via a base station or access point and direct communication between vehicles or user terminals. Wide-area wireless communication includes wide-area wireless LAN (IEEE 802.11ah), WiMax (IEEE 802.6), etc. Examples of direct communication between vehicles or user terminals include WiFi Direct and Bluetooth (registered trademark).

[0067] The present disclosure can also be realized by supplying a computer program implementing the functions described in the above embodiments to a computer, and having one or more processors of the computer read and execute the program. Such a computer program may be provided to the computer by a non-transitory computer-readable storage medium connectable to the system bus of the computer, or may be provided to the computer via a network. Non-transitory computer-readable storage media include, for example, any type of disk, such as a magnetic disk (floppy disk, hard disk drive (HDD), etc.), an optical disk (CD-ROM, DVD disk, Blu-ray disk, etc.), a read-only memory (ROM), a random access memory (RAM), an EPROM, an EEPROM, a magnetic card, a flash memory, an optical card, and any type of medium suitable for storing electronic instructions. [Explanation of symbols]

[0068] 100(100A~100D):Vehicle 110: Control unit 111: CPU 112: Storage unit 120: Wireless communication device 130: GPS device 200: Base station

Claims

1. A mobile object including a wireless communication unit and a control unit, The control unit is receiving, by the wireless communication unit, communication quality messages from a plurality of other moving objects, the communication quality messages including location information and communication quality information at the locations indicated by the location information; determining a destination based on the communication quality message; presenting information about the destination to a user; and A mobile object characterized by:

2. The control unit determines, as the destination, a location where the communication quality is equal to or higher than a predetermined standard.

2. The moving body according to claim 1 .

3. The information about the destination is a route to the destination.

2. The moving body according to claim 1 .

4. The communication quality is a received radio wave strength, a reception quality, a signal to interference plus noise ratio, or a communication throughput.

2. The moving body according to claim 1 .

5. A mobile object including a wireless communication unit and a control unit, The control unit is receiving, by the wireless communication unit, communication quality messages from a plurality of other moving objects, the communication quality messages including location information and communication quality information at the locations indicated by the location information; generating a communication quality map for each location based on the communication quality messages; searching for a route to a destination based on the communication quality map, and presenting the route to a user or moving along the route; A mobile object characterized by:

6. The control unit is accepting a route search request including a destination from the user; In response to the route search request, a request message is transmitted to the other device to request the communication quality message; searching for a route to the destination using a communication quality map generated based on the communication quality message obtained in response to the request message, and presenting the route to the user; 6. The moving body according to claim 5.

7. The control unit searches preferentially for a route whose communication quality is equal to or higher than a predetermined standard based on the communication quality map.

6. The moving body according to claim 5.

8. The control unit further determines a location where communication quality is high as the destination.

6. The moving body according to claim 5.

9. The communication quality is a received radio wave strength, a reception quality, a signal to interference plus noise ratio, or a communication throughput.

6. The moving body according to claim 5.

10. receiving communication quality information from a plurality of other wireless communication devices; selecting at least one wireless communication device from among the plurality of other wireless communication devices based on the communication quality information; requesting the selected other wireless communication device to relay communication via a base station; A wireless communication device comprising a control unit that executes the above.

11. The control unit is Transmitting a request message to the other wireless communication devices to request the communication quality information; selecting at least one wireless communication device from among the plurality of other wireless communication devices based on the communication quality information obtained by the request message; 11. The wireless communication device according to claim 10.

12. The wireless communication device is a wireless communication device that performs portable wireless communication.

11. The wireless communication device according to claim 10.

13. The communication quality is a received radio wave strength, a reception quality, a signal-to-interference-plus-noise ratio, or a communication throughput, the control unit selects a wireless communication device having the highest received radio wave strength, the highest reception quality, the highest signal-to-interference-plus-noise ratio, or the highest communication throughput.

11. The wireless communication device according to claim 10.

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