In-vehicle communication device, communication control method, and program

Abstract

To make it possible to set suitable transmission power when a vehicle is in a parked state and a charging state.SOLUTION: An in-vehicle communication device mounted on a vehicle includes a control unit that determines transmission power to be used for wireless communication based on whether the current charging mode is a first mode or a second mode, regarding wireless communication using the in-vehicle communication device when the vehicle is in a parked state and a charging state in which a secondary battery that supplies power to a motor provided in the vehicle is being charged.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to an in-vehicle communication device, a communication control method, and a program. [Background technology]

[0002] Conventionally, there are in-vehicle communication devices that are capable of Wi-Fi connection (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-062548 Summary of the Invention [Problem to be solved by the invention]

[0004] The present disclosure aims to provide an in-vehicle communication device, a communication control method, and a program that can adjust the transmission power of wireless communication to an appropriate level in a vehicle that is parked and charging. [Means for solving the problem]

[0005] One aspect of the present disclosure is an in-vehicle communication device mounted on a vehicle, the in-vehicle communication device including a control unit that determines the transmission power to be used for wireless communication using the in-vehicle communication device when the vehicle is parked and in a charging state in which a secondary battery that supplies power to a motor equipped in the vehicle is being charged, based on whether the current charging mode is a first mode or a second mode.

[0006] Another aspect of the present disclosure is a communication control method for determining the transmission power to be used for wireless communication using an in-vehicle communication device mounted on a vehicle when the vehicle is parked and in a charging state in which a secondary battery that supplies power to a motor equipped in the vehicle is being charged, based on whether the current charging mode is a first mode or a second mode.

[0007] Another aspect of the present disclosure is a program that causes a computer of an in-vehicle communication device mounted on a vehicle to execute a step of determining a transmission power to be used for wireless communication using the in-vehicle communication device when the vehicle is parked and in a charging state in which a secondary battery that supplies power to a motor equipped in the vehicle is being charged, based on whether the current charging mode is a first mode or a second mode.

[0008] Other aspects of the present disclosure may include an information processing system including the above-described in-vehicle communication device, a non-transitory storage medium (computer-readable medium) on which the above-described program is recorded, and the like. [Effects of the Invention]

[0009] According to the present disclosure, the transmission power of wireless communication can be set to an appropriate level in a vehicle that is parked and charging. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a diagram illustrating an example of the configuration of an information processing system. [Figure 2] FIG. 2 is a diagram illustrating an example of the configuration of an in-vehicle communication device. [Figure 3] FIG. 3 is a flowchart illustrating a first processing example of the in-vehicle communication device. [Figure 4] FIG. 4 is a flowchart showing a second processing example of the in-vehicle communication device. [Figure 5] FIG. 5 is a flowchart showing a third processing example of the in-vehicle communication device. [Figure 6]FIG. 6 is a flowchart showing a fourth processing example of the in-vehicle communication device. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments of an in-vehicle communication device, a communication control method, and a program will be described with reference to the drawings. Note that in all drawings of the following embodiments, the same or corresponding parts are designated by the same reference numerals. Furthermore, the present disclosure is not limited to the embodiments described below.

[0012] <Information Processing System> Fig. 1 is a diagram showing an example of the configuration of an information processing system. In Fig. 1, the information processing system is a system for a vehicle 4 to communicate with a communication partner (for example, a server 6) connected to a network 1.

[0013] The network 1 is, for example, a public communication network such as the Internet. A local area network (LAN) is connected to the network 1 as an access network, and the LAN includes a wireless LAN access point (AP) 2. The wireless LAN conforms to or complies with a predetermined wireless communication standard, for example, the IEEE802.11 series (including Wi-Fi).

[0014] The vehicle 4 is an EV (Electric Vehicle) and includes a motor 7 that drives the drive wheels and a secondary battery (sometimes called a storage battery or a rechargeable battery) 8 that supplies driving power to the motor 7. The EV may be a plug-in hybrid vehicle (PHEV), a fuel cell vehicle (FCV), a battery electric vehicle (BEV), or the like. The vehicle 4 may be driven by a driver or may be an autonomous, unmanned vehicle.

[0015] The vehicle 4 is equipped with an in-vehicle communication device 10. The in-vehicle communication device 10 may be installed in the vehicle or may be detachable from the vehicle 4. The in-vehicle communication device 10 is used to transmit various information, such as information (e.g., IoT data) obtained from various sensors equipped in the vehicle 4, to the server 6 via the network 1. The in-vehicle communication device 10 can also function as an access point (base station) for connecting a mobile terminal 5 carried by the driver or passenger of the vehicle 4 to the network 1. The mobile terminal 5 is, for example, a smart device such as a smartphone or a tablet terminal, or a laptop personal computer (PC). The type of the mobile terminal 5 is not important as long as it is capable of communicating with the in-vehicle communication device 10.

[0016] <In-vehicle communication device> Fig. 2 is a diagram showing an example of the configuration of the in-vehicle communication device 10. In Fig. 2, the in-vehicle communication device 10 includes a processor 31 serving as a processing unit or control unit (controller), a storage device 32, communication interfaces (communication IFs) 33A and 33B, an input device 34, and an output device 35, which are interconnected via a bus 30.

[0017] The storage device 32 includes a main storage device and an auxiliary storage device. The main storage device is used as a storage area for programs and data, a program expansion area, a program work area, and a buffer area for communication data. The main storage device is configured with RAM (Random Access Memory) or a combination of RAM and ROM (Read Only Memory). The auxiliary storage device is used as a storage area for data and programs. Non-volatile storage media such as a hard disk, a solid state drive (SSD), a flash memory, and an EEPROM (Electrically Erasable Programmable Read-Only Memory) can be used as the auxiliary storage device.

[0018] The communication IFs 33A and 33B are circuits that perform processing related to wireless communication and each have an antenna for transmitting and receiving radio waves. The communication IFs 33A and 33B perform processing for transmitting (radiating) and receiving radio waves, and operate as a transmitter and a receiver (communication unit). The communication IF 33A is used for communication with the AP 2, and the communication IF 33B is used for communication with the mobile terminal 5 (operating as an access point for the mobile terminal 5). The communication IF 33A conforms to or complies with the same wireless communication standard as the AP 2. The communication IF 33B conforms to or complies with the wireless communication standard that the mobile terminal 5 conforms to or complies with. The wireless communication standard that the communication IF 33B conforms to or complies with may be the same as or different from the wireless communication standard that the communication IF 33A conforms to or complies with. Instead of the communication IFs 33A and 33B, a communication device that relays information or data from the vehicle 4 and the mobile terminal 5 to the AP 2 may be provided.

[0019] The input device 34 includes keys, buttons, a pointing device, a touch panel, etc., and is used to input information. The input device 34 may include a microphone (audio input device). The output device 35 is, for example, a liquid crystal display or an organic EL display, and displays information and data. The output device 35 may include a speaker (audio output device). The sensor group 36 acquires vehicle-related information from the vehicle 4. The vehicle-related information acquired includes physical data such as the state or temperature of various mechanisms of the vehicle 4, and information indicating the interior of the vehicle 4 or the environment surrounding the vehicle 4 (such as location information of the vehicle 4 or information about objects present in the vicinity). The sensor group 36 may include a camera, radar, lidar, GPS receiver, or other measuring equipment depending on the type of information to be collected.

[0020] The processor 31 is, for example, a CPU (Central Processing Unit). The server 31 executes various programs stored in the storage device 32 to perform various processes.

[0021] For example, the processor 31 uses the communication IF 33A to perform processing to transmit information or data collected by the sensor group 36 to the AP2 (the server 6 connected to the network 1). The processor 31 also uses the communication IF 33B to perform wireless communication with the mobile terminal 5, transmitting and receiving data or information to and from the mobile terminal 5. The processor 31 can also perform processing to transmit data or information received from the mobile terminal 5 to the AP2. The processor 31 performs transmission power control for communication with the AP2 and communication with the mobile terminal 5. The transmission power indicates the strength of radio waves emitted (transmitted) from the antenna. The processor 31 determines (controls) the magnitude of the transmission power according to the state of the vehicle 4.

[0022] It should be noted that a plurality of CPUs or a multi-core CPU may be applied as the processor 31. At least a part of the processing performed by the CPU may be performed by a processor other than the CPU, such as a DSP (Digital Signal Processor) or a GPU (Graphical Processing Unit). The processing performed by the CPU may be performed by a dedicated or general-purpose integrated circuit (hardware). The integrated circuit may include an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array). Alternatively, at least a part of the processing performed by the CPU may be performed by a combination of a processor and an integrated circuit. The combination is called, for example, a microcontroller (MCU), an SoC (System-on-a-chip), a system LSI, or a chipset. The processor 31, the integrated circuit, and the combination described above are each an example of a circuit.

[0023] <First processing example> 3 is a flowchart showing a first processing example of the in-vehicle communication device 10. The first processing example is performed by the processor 31 executing a program stored in the storage device 32 or the like. The processing in FIG. 3 includes communication using the communication IF 33A and communication using the communication IF 33B. It is possible to apply this to at least one of the above (for example, both of them).

[0024] In step S001, the processor 31 determines whether or not communication is to be started using the communication IF 33A or the communication IF 33B. If it is determined that communication is to be started, the process proceeds to step S002.

[0025] In step S002, the processor 31 determines the vehicle state based on information obtained by the sensor group 36. That is, the processor 31 determines whether the vehicle state is a parked state and a charging state, or a running state or a non-charging state. The parked state (stopped state) is a state in which the vehicle 4 remains stopped. Whether the vehicle is in a parked state or a running state can be determined by detecting, for example, using the sensor group 36 whether the shift lever position of the vehicle 4 is in "parking" or whether the position of the vehicle 4 has not changed for a certain period of time (in other words, the determination is made using information obtained from the sensor group 36, etc.).

[0026] The charging state indicates that the secondary battery 8 of the vehicle 4 is being charged, and whether the secondary battery 8 is in the charging state or not can be determined, for example, by measuring the terminal voltage of the secondary battery 8 using the sensor group 36. If the vehicle state is determined to be the parked state and the charging state in step S002, the process proceeds to step S003. On the other hand, if the vehicle state is determined to be the traveling state or the not-charging state, the process proceeds to step S004.

[0027] In step S003, processor 31 determines whether the current charging mode is the rapid mode or the normal mode. In the rapid mode, the charging amount per unit time is greater than the charging amount per unit time in the normal mode, and charging can be completed in a shorter time than in the normal mode. The rapid mode is an example of a first mode in which the charging amount per unit time is a first charging amount, and the normal mode is an example of a second mode in which the charging amount per unit time is less than the first charging amount (the charging amount in the rapid mode).

[0028] The processor 31 can determine the charge mode by referring to information indicating the current charge mode stored in the storage device 32, or based on the value of the charge voltage (applied voltage) for the secondary battery 8 measured using the sensor group 36. That is, if it is determined that the charge voltage is greater than a threshold, the charge mode can be determined to be the rapid mode, and if not, the charge mode can be determined to be the normal mode. If the charge mode is determined to be the rapid mode, the process proceeds to step S005, and if it is determined to be the normal mode, the process proceeds to step S004. The processor 31 determines the transmission power to be used for wireless communication based on the determination result of step S003, i.e., whether the charge mode is the rapid mode or the normal mode.

[0029] When the process proceeds to step S004, the processor 31 performs normal transmission power control. For example, the processor 31 sets the value of the transmission power to be used for communication to an initial value. Then, the processor 31 changes (increases or decreases) the transmission power according to the field strength of the radio waves received from the communication partner (AP 2 or mobile terminal 5). For example, when the field strength is below a threshold, the processor 31 increases the transmission power in stages. For example, the range from a certain transmission power value to the maximum transmission power value is divided into two or more stages, and the processor 31 sets the transmission power according to the field strength. In other words, the processor 31 determines the use of transmission power according to the field strength. When the process of step S004 ends, the process proceeds to step S006.

[0030] In step S005, the processor 31 sets the upper limit of the transmission power to be used for communication (the upper limit of the transmission power that can be used in the transmission power control) to a value smaller (lower) than the maximum value of the transmission power, and proceeds to step S006. That is, when proceeding to step S005, the processor 31 sets the transmission power to be used for wireless communication to a value smaller than the maximum value. Decide to use it for communication.

[0031] In steps S004 and S005, the processor 31 determines and sets the value of the transmission power to be used for communication, but a configuration may be adopted in which the value of the transmission power is determined and set by a device other than the processor 31. Information indicating the determined value of the transmission power is output, for example, in the form of a control signal to a circuit that changes the magnitude of the transmission power. Alternatively, the information indicating the determined value of the transmission power may be transmitted in the form of data to a circuit that controls the transmission power, and the value of the transmission power may be changed through interpretation of the data.

[0032] In step S006, the processor 31 determines whether the communication has ended. If it is determined that the communication has not ended, the process returns to step S002. On the other hand, if it is determined that the communication has ended, the processor 31 performs a process to end the communication, and ends the process of FIG. 3.

[0033] According to the first processing example, when the vehicle 4 is in a parked state and a charging state, in step S003, it is determined whether the charging mode is a rapid mode or a normal mode. If the charging mode is the rapid mode, in step S005, the upper limit of the transmission power value is set to a value smaller (lower) than the maximum value of the transmission power. Then, within the set upper limit, the transmission power is controlled (increased and decreased) in stages according to the field strength of the received radio waves. If the transmission power is set to the maximum while the secondary battery 8 is being charged, it may take a long time for the secondary battery 8 to be fully charged (for charging to be completed). By setting the upper limit of the transmission power control to a value smaller than the maximum value, it is possible to complete charging earlier.

[0034] <Second processing example> 4 is a flowchart showing a second processing example of the in-vehicle communication device 10. The second processing example is performed by the processor 31 executing a program stored in the storage device 32 or the like. The processing in FIG. 4 is applicable to at least one (for example, both) of communication using the communication IF 33A and communication using the communication IF 33B.

[0035] The process shown in Fig. 4 is the same as the process shown in Fig. 3, except that step S005A is provided instead of step S005. Therefore, explanations of steps other than step S005A will be omitted. In step S005A, processor 31 forcibly sets the value of transmission power to the maximum value. That is, processor 31 fixes the value of transmission power at the maximum value.

[0036] In the second processing example, unlike the first processing example, the transmission power used for communication is fixed at a maximum value. According to the second processing example, for example, when a passenger (such as a driver or a fellow passenger) of the vehicle 4 communicates using the mobile terminal 5 inside the vehicle 4 while charging, a suitable communication environment can be provided for the passenger.

[0037] <Third processing example> Fig. 5 is a flowchart showing a third processing example of the in-vehicle communication device 10. The third processing example is performed by the processor 31 executing a program stored in the storage device 32 or the like. The processing in Fig. 5 is applicable to at least one (for example, both) of communication using the communication IF 33A and communication using the communication IF 33B.

[0038] The process shown in FIG. 5 differs from the first processing example shown in FIG. 3 in that step S013 is provided instead of step S005, and steps S011 and S012 are provided between step S003 and step S013.

[0039] In step S011, the processor 31 checks whether information indicating input settings related to transmission power is stored. The processor 31 determines whether the input setting is stored in the storage device 32. The input setting is information indicating whether the upper limit of the transmission power is set to a value lower than the maximum value or fixed at the maximum value. The operator of the in-vehicle communication device 10 can use the input device 34 or the like to store (set) information indicating the input setting in advance in the storage device 32 when the vehicle is parked and charging. If the processor 31 determines that the input setting is present, the processor 31 proceeds to step S013; otherwise, the processor 31 proceeds to step S012.

[0040] In step S012, the processor 31 determines whether the surrounding environment of the vehicle 4 satisfies a condition. The condition related to the surrounding environment is, for example, that the communication IF 33B and the portable terminal 5 are connected, that radio waves from the portable terminal 5 are detected even though the communication IF 33B is not connected, or that the received field strength of the radio waves from the portable terminal 5 is equal to or greater than a threshold. However, the condition related to the surrounding environment may be other than the above examples. If it is determined that the condition is satisfied, the process proceeds to step S013; if not, the process proceeds to step S004.

[0041] In step S013, processor 31 sets an upper limit for transmission power. When the process proceeds from step S011 to step S013, processor 31 sets the upper limit for transmission power to a value smaller than the maximum value, or sets the transmission power to the maximum value (fixes it at the maximum value) according to the contents of the input setting. When the process proceeds from step S012 to step S013, processor 31 fixes the transmission power to the maximum value. As in the second processing example, this is to ensure optimal communication with mobile terminal 5. However, depending on conditions related to the surrounding environment, if the conditions are met, in step S013, the upper limit for transmission power may be set to a value smaller than the maximum value. Except for the above, the process of FIG. 5 is the same as the process of FIG. 3, and therefore a description of similar points will be omitted.

[0042] According to the third processing example, the upper limit of the transmission power can be lowered or fixed to the maximum value depending on whether the conditions related to the input settings or the surrounding environment are satisfied. The judgment of the input settings and the judgment of whether the conditions related to the surrounding environment are satisfied or not are both optional.

[0043] <Fourth processing example> Fig. 6 is a flowchart showing a fourth processing example of the in-vehicle communication device 10. The fourth processing example is performed by the processor 31 executing a program stored in the storage device 32 or the like. The processing in Fig. 6 is applicable to at least one (for example, both) of communication using the communication IF 33A and communication using the communication IF 33B.

[0044] The process shown in FIG. 6 differs from the first example of the process shown in FIG. 3 in that step S014 is provided between step S003 and step S005.

[0045] In step S014, processor 31 determines whether the length of time between the current time and the estimated time of completion of charging of secondary battery 8, which is stored in storage device 32, is equal to or less than a threshold. If it is determined that the length of time is equal to or less than the threshold, processor 31 sets the upper limit of transmission power to a value smaller than the maximum value (step S005). Except for the above, the processing in Figure 6 is similar to the processing in Figure 3, and therefore a description of similar points will be omitted.

[0046] In the fourth processing example, if the time required for charging is equal to or less than the threshold (or less), the upper limit of the transmission power is reduced to end charging earlier. However, if it is determined in step S014 that the time is equal to or greater than the threshold (or more), the transmission power may be fixed at the maximum value. This is because, if charging takes a time equal to or greater than the threshold, it is considered that priority should be given to optimal communication with the mobile terminal 5.

[0047] In the embodiment, the in-vehicle communication device 10 mounted on the vehicle 4 includes a processor 31 (controller ) The processor 31 can perform the following with regard to wireless communication using the in-vehicle communication device 10 when the vehicle 4 is in a parked state and in a charging state in which the secondary battery 8 that supplies power to the motor 7 provided in the vehicle 4 is being charged. That is, the processor 31 can determine the transmission power to be used for wireless communication based on whether the current charging mode is a rapid mode or a normal mode. The in-vehicle communication device 10 and the communication control method using the in-vehicle communication device 10 can set the transmission power of wireless communication to an appropriate level in a vehicle that is parked and charging.

[0048] As shown in the first processing example (FIG. 3), when the charging mode is the rapid mode (first mode), the processor 31 can set the upper limit of the transmission power to a value smaller than the maximum value. That is, a configuration can be adopted in which the value of the transmission power used for wireless communication in the rapid mode is a value smaller than the maximum transmission power.

[0049] On the other hand, as shown in the second processing example (FIG. 4), when the charging mode is the rapid mode (first mode), the processor 31 can fix the transmission power at its maximum value. That is, a configuration can be adopted in which the value of the transmission power used for wireless communication in the rapid mode is the maximum transmission power value.

[0050] Furthermore, as shown in the third processing example (Figure 5), the processor 31 (control unit) can determine whether to set the upper limit of the transmission power used for wireless communication when the charging mode is the rapid mode to a value smaller than the maximum value of the transmission power, or to fix the transmission power at that maximum value, based on the following information. -Information indicating input settings (information indicating whether the maximum value can be used), or Information indicating the surrounding environment of the in-vehicle communication device 10.

[0051] The information indicative of the surrounding environment may include: Information indicating whether the in-vehicle communication device 10 is detecting radio waves from the mobile terminal 5. Information indicating whether the strength of the radio waves (field strength) received from the mobile terminal 5 exceeds a threshold value. Information indicating whether the in-vehicle communication device 10 and the mobile terminal 5 are in a connected state. The conditions relating to the surrounding environment may be set as a combination of two or more of the above-mentioned information.

[0052] Furthermore, as shown in the fourth processing example (Figure 6), when the charging mode is the rapid mode and the length of time from the current time to the scheduled time when charging of the secondary battery 8 is completed is equal to or less than a threshold, a configuration can be adopted in which the value of the transmission power used for wireless communication is a value smaller than the maximum transmission power.

[0053] Furthermore, as explained in the fourth processing example, a configuration may be adopted in which, when the charging mode is the rapid mode and the length of time from the current time to the scheduled time when charging of the secondary battery 8 is completed exceeds a threshold value, the value of the transmission power used for wireless communication becomes a value indicating the maximum transmission power.

[0054] The order of processing in the sequence diagrams and flowcharts in this specification may be changed as long as no contradictions are present.

[0055] The processes and means described in this disclosure can be freely combined and implemented as long as no technical contradictions arise. Furthermore, a process described as being performed by one device may be shared and executed by multiple devices. Alternatively, a process described as being performed by different devices may be executed by one device. In a computer system, the hardware configuration (server configuration) by which each function is realized is flexible. can be changed to.

[0056] The present disclosure can also be realized by providing a computer program implementing the functions described in the above embodiments to a computer, and having one or more processors in the computer read and execute the program. Such a computer program may be provided to the computer on a non-transitory computer-readable medium connectable to the computer's system bus or via a network. Non-transitory computer-readable media include, for example, any type of disk, such as a magnetic disk (e.g., a floppy disk, a hard disk drive (HDD), etc.), an optical disk (e.g., a CD-ROM, a DVD disk, a Blu-ray disk), a read-only memory (ROM), a random-access memory (RAM), an EPROM, an EEPROM, a magnetic card, a flash memory, an optical card, or any type of medium suitable for storing electronic instructions. [Explanation of symbols]

[0057] 1 Network, 2 Access Point (AP), 4 Vehicle, 5 Mobile Terminal, 10 In-Vehicle Communication Device, 31 Processor, 32 Storage Device

Claims

1. An in-vehicle communication device mounted on a vehicle, a control unit that determines a transmission power to be used for wireless communication using the in-vehicle communication device when the vehicle is parked and in a charging state in which a secondary battery that supplies power to a motor provided in the vehicle is being charged, based on whether a current charging mode is a first mode or a second mode; An in-vehicle communication device comprising:

2. When the charging mode is the first mode, the value of the transmission power used for the wireless communication is smaller than the maximum value of the transmission power. The vehicle-mounted communication device according to claim 1 .

3. When the charging mode is the first mode, the value of the transmission power used in the wireless communication becomes the maximum value of the transmission power. The vehicle-mounted communication device according to claim 1 .

4. When the charging mode is the first mode, the control unit determines whether to set an upper limit of the transmission power used in the wireless communication to a value smaller than a maximum value of the transmission power or to fix the transmission power at the maximum value, based on information indicating whether the maximum value can be used or information indicating a surrounding environment of the in-vehicle communication device. The vehicle-mounted communication device according to claim 1 .

5. The information indicating the surrounding environment is information indicating whether the in-vehicle communication device is detecting radio waves from a mobile terminal, information indicating whether the strength of radio waves received from the mobile terminal exceeds a threshold, or information indicating whether the in-vehicle communication device and the mobile terminal are connected. The vehicle-mounted communication device according to claim 4 .

6. When the charging mode is the first mode and the length of time from the current time to the scheduled charging completion time of the secondary battery is equal to or less than a threshold, the value of the transmission power used in the wireless communication becomes smaller than the maximum transmission power. The vehicle-mounted communication device according to claim 1 .

7. When the charging mode is the first mode and the length of time from the current time to the scheduled charging completion time of the secondary battery exceeds a threshold, the value of the transmission power used in the wireless communication becomes a value indicating maximum transmission power.

2. The in-vehicle communication device according to claim 1.

8. An in-vehicle communication device installed in a vehicle With regard to wireless communication using the in-vehicle communication device when the vehicle is in a parked state and in a charging state in which a secondary battery that supplies power to a motor provided in the vehicle is being charged, the transmission power to be used for the wireless communication is determined based on whether the current charging mode is a first mode or a second mode. A communication control method comprising:

9. When the charging mode is the first mode, the value of the transmission power used for the wireless communication is smaller than the maximum transmission power. The communication control method according to claim 8.

10. When the charging mode is the first mode, a transmission power used for the wireless communication is The value of is the maximum value of the transmission power. The communication control method according to claim 8.

11. When the charging mode is the first mode, the in-vehicle communication device determines whether to set an upper limit of the transmission power used in the wireless communication to a value smaller than a maximum value of the transmission power or to fix the transmission power at the maximum value, based on information indicating whether the maximum value can be used or information indicating a surrounding environment of the in-vehicle communication device. The communication control method according to claim 8.

12. The information indicating the surrounding environment is information indicating whether the in-vehicle communication device is detecting radio waves from a mobile terminal, information indicating whether the strength of radio waves received from the mobile terminal exceeds a threshold, or information indicating whether the in-vehicle communication device and the mobile terminal are connected. The communication control method according to claim 11.

13. When the charging mode is the first mode and the length of time from the current time to the scheduled charging completion time of the secondary battery is equal to or less than a threshold, the value of the transmission power used in the wireless communication becomes smaller than the maximum transmission power. The communication control method according to claim 8.

14. When the charging mode is the first mode and the length of time from the current time to the scheduled charging completion time of the secondary battery exceeds a threshold, the value of the transmission power used in the wireless communication becomes a value indicating maximum transmission power. The communication control method according to claim 8.

15. The computer of the vehicle-mounted communication device determining a transmission power to be used for wireless communication using the in-vehicle communication device when the vehicle is in a parked state and in a charging state in which a secondary battery that supplies power to a motor provided in the vehicle is being charged, based on whether a current charging mode is a first mode or a second mode; A program that executes the following.

16. causing the computer to set a value smaller than a maximum value of transmission power as a value of transmission power to be used in the wireless communication when the charging mode is the first mode; The program according to claim 15.

17. causing the computer to set a maximum value of transmission power as a value of transmission power to be used in the wireless communication when the charging mode is the first mode; The program according to claim 15.

18. causing the computer to execute a step of determining, when the charging mode is the first mode, whether to set an upper limit of transmission power used in the wireless communication to a value smaller than a maximum value of transmission power or to fix the transmission power at the maximum value, based on information indicating whether the maximum value can be used or information indicating a surrounding environment of the in-vehicle communication device. The program according to claim 15.

19. causing the computer to set a value smaller than a maximum value of transmission power as a value of transmission power to be used in the wireless communication when the charging mode is the first mode and the length of time from the current time to the scheduled charging completion time of the secondary battery is equal to or less than a threshold value; The program according to claim 15.

20. causing the computer to set a maximum value of transmission power as a value of transmission power to be used in the wireless communication when the charging mode is the first mode and the length of time from the current time to the scheduled time of charging completion of the secondary battery exceeds a threshold value; The program according to claim 15.

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