JP6760351B2 - In-vehicle short-range wireless communication device, master unit, and slave unit - Google Patents

Description

The present invention relates to an in-vehicle short-range wireless communication device , a master unit, and a slave unit .

Conventionally, as disclosed in Patent Document 1, a user receives various services such as hands-free calling by using wireless communication between a mobile terminal carried by the user and a short-range wireless communication device mounted on a vehicle. The technology to make it possible is known.

JP-A-2014-130566

Services using wireless communication between a mobile terminal and a short-range wireless communication device are not limited to services limited to the vehicle interior, such as hands-free calling disclosed in Patent Document 1. For example, demand for services such as data communication that receives data on vehicles outside the vehicle is expected in the future. Depending on the type of service, multiple short-range wireless communication devices may be installed in the vehicle, and the position of the mobile terminal may be estimated from the strength of radio waves received from the mobile terminal by each of these multiple short-range wireless communication devices. It is thought that this will also be necessary.

An object of the present invention is to provide an in-vehicle short-range wireless communication device , a master unit, and a slave unit that can detect a mobile terminal located in any direction of a vehicle.

The in-vehicle short-range wireless communication device of the present invention is an in-vehicle short-range wireless communication device mounted on a vehicle and for detecting the position of a mobile terminal, and is connected to a mobile terminal located in a communication range. As a device for performing short-range wireless communication, it has one master unit (1) and a plurality of slave units (2a, 2b, 2c), and the master unit covers the entire circumference of the vehicle. It has a communication range and has a mobile terminal detection unit (13) that detects a mobile terminal located in the communication range, and a plurality of slave units are arranged on the right side and the left side of the vehicle, respectively, and communication different from the above communication range. Having a range, when the master unit is connected to the mobile terminal by communication, the power supply of multiple slave units is switched on, and the multiple slave units start receiving radio waves from the mobile terminal. It is characterized by including an activation control unit (14) that detects a position from radio waves received by a plurality of slave units.
The master unit of the present invention is a master unit mounted on a vehicle and used in an in-vehicle short-range wireless communication device for detecting the position of a mobile terminal, and communicates with a mobile terminal located in a communication range. A mobile terminal detector (13), which is a master unit as a device for connecting and performing short-range wireless communication, has a communication range of the entire circumference with respect to the vehicle, and detects a mobile terminal located in the communication range. When the master unit is connected to the mobile terminal by communication, the master unit communicates with the mobile terminal located in the communication range, which is arranged on the right side and the left side of the vehicle and has a communication range different from the above communication range, respectively, for short-range wireless communication. The power supply of multiple slave units as a communication device is switched on, the reception of radio waves from the mobile terminal is started by the multiple slave units, and the position is detected from the radio waves received by the multiple slave units. It is characterized in that it is provided with an activation control unit (14) to be operated.
The slave unit of the present invention is a slave unit mounted on a vehicle and used in an in-vehicle short-range radio communication device for detecting the position of a mobile terminal, and communicates with a mobile terminal located within a communication range. of the apparatus for performing short-range wireless communication by connecting, it either handset der of which is disposed on the right and left sides of the vehicle respectively, radio waves received by a plurality thereof are arranged on the right and left sides of the vehicle It is a slave unit whose position is detected from, and has a communication range that is different from the communication range of the master unit that has a communication range of the entire circumference with respect to the vehicle and detects a mobile terminal located in that communication range. When a communication connection is made with a mobile terminal, the power supply is switched on to start receiving radio waves from the mobile terminal.

It is a figure which shows an example of the schematic structure of the short-range wireless communication system 100. It is a functional block diagram which shows an example of the schematic structure of the master unit 1. It is a functional block diagram which shows an example of the schematic structure of the slave unit 2. It is a flowchart which shows an example of the flow of the slave unit start control related processing in a master unit 1. It is a flowchart which shows an example of the flow of terminal detection in the handset start control related processing. It is a schematic diagram which shows an example of the transition of the activation state of the master unit 1 and the slave units 2a to 2c in the first embodiment. It is a schematic diagram which shows an example of the transition of the activation state of the master unit 1 and the slave units 2a to 2c in the modification 1.

(Embodiment 1)
<Rough configuration of short-range wireless communication system 100>
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing an example of a schematic configuration of a short-range wireless communication system 100 to which the present invention is applied. As shown in FIG. 1, the short-range wireless communication system 100 includes a short-range wireless communication device (hereinafter, master unit 1) mounted on the vehicle A as a master unit, and a plurality of short-range wireless communication devices as slave units. (Hereinafter, slave units 2a to 2c) and the mobile terminal 3 are included. The master unit 1 and the slave units 2a to 2c are connected by, for example, an in-vehicle LAN. The master unit and the slave units 2a to 2c correspond to the short-range wireless communication system according to the claim.

The mobile terminal 3 is a mobile terminal such as a multifunctional mobile phone that the user can carry and carry. The master unit 1 and the slave units 2a to 2c are mounted on the vehicle A as described above, and perform wireless communication by communicating with a mobile terminal 3 located within the communication range of the own device. Further, the master unit 1 controls the activation of the slave units 2a to 2c, and the slave units 2a to 2c control the equipment mounted on the vehicle A to use wireless communication with the mobile terminal 3. Provide service.

As an example of the service, a hands-free call is made by using a speaker and a microphone mounted on the vehicle A instead of making a call by the mobile terminal 3, and an audio that reproduces a music stored in the mobile terminal 3 by car audio. There is streaming. There is also data communication in which the mobile terminal 3 acquires information from the device of the vehicle A, and remote operation of operating the device of the vehicle A from the mobile terminal 3. Examples of the information acquired by the mobile terminal 3 in the data communication include the average fuel consumption, the mileage, and the tire pressure of the vehicle A. An example of remote operation is an operation of starting a car air conditioner from outside the vehicle.

The slave units 2a to 2c are mounted at different positions of the vehicle A, and have different communication ranges. For example, the slave unit 2a is mounted at a position closer to the left side of the vehicle A, and the communication range is from the inside of the vehicle to the outside of the vehicle on the left side of the vehicle A. The slave unit 2b is mounted at a position closer to the right side of the vehicle A, and the communication range is from the inside of the vehicle to the outside of the vehicle on the right side of the vehicle A. The slave unit 2c is mounted at a position closer to the rear of the vehicle A, and has a communication range from the inside of the vehicle near the rear of the vehicle A to the outside of the vehicle.

Hereinafter, when the slave units 2a to 2c are not distinguished, they will be referred to as the slave unit 2. In the present embodiment, the short-range wireless communication system 100 includes three slave units 2, but the present invention is not limited to this, and if there are a plurality of slave units 2, the number of slave units 2 other than the three is included in the short-range wireless communication system 100. It may be a configuration included in.

<Outline configuration of master unit 1>
Here, an example of a schematic configuration of the master unit 1 will be described with reference to FIG. As shown in FIG. 2, the master unit 1 includes a wireless communication unit 11, a mobile terminal detection unit 13, a slave unit activation control unit 14, and a terminal position estimation unit 15.

The wireless communication unit 11 has an antenna 12 and performs short-range wireless communication with the mobile terminal 3 having a communication range of, for example, at most several tens of meters. The communication range of the wireless communication unit 11 preferably covers the entire circumference of the vehicle A so that the mobile terminal 3 located in any direction of the vehicle A can be detected. Further, the communication range of the wireless communication unit 11 is a range that stays in the vicinity of the vehicle A, such as keeping it within 1 meter or several meters from the vehicle A so as not to detect the mobile terminal 3 of the user who is too far from the vehicle A. Is preferable.

The antenna 12 is, for example, a transmission / reception antenna, but the wireless communication unit 11 may have a transmission antenna and a reception antenna. In addition, for short-range wireless communication, from the viewpoint of convenience, the short-range wireless communication standards such as Bluetooth (registered trademark) and Wi-Fi (registered trademark), which are standardly used in multifunctional mobile phones, are followed. It is preferable to adopt short-range wireless communication.

In addition, in an electronic key system such as a smart entry system, a mobile terminal 3 is used instead of the electronic key, and a UHF band is used in order to share the wireless communication unit 11 with the wireless communication unit used in the electronic key system. It may be configured to adopt short-range wireless communication.

The mobile terminal detection unit 13 detects the mobile terminal 3 registered in the master unit 1 located in the communication range of the master unit 1. For example, it is assumed that the registration is performed by storing the code for identifying the mobile terminal 3 in the non-volatile memory of the master unit 1. The determination as to whether or not the registration has been completed may be performed based on whether or not the code stored in the master unit 1 and the code of the mobile terminal 3 received by the wireless communication unit 11 match. Then, when the wireless communication unit 11 communicates with the registered mobile terminal 3, the mobile terminal detection unit 13 detects the registered mobile terminal 3 located in the communication range. The communication connection referred to here indicates a state in which the connection is established according to the communication protocol.

Further, the mobile terminal detection unit 13 is located in the communication range even when the radio wave is received from the registered mobile terminal 3 and the received radio wave strength (that is, RSSI) is equal to or higher than the threshold value. The registered mobile terminal 3 is detected. The threshold value referred to here can be arbitrarily set according to how far the mobile terminal 3 from the vehicle A is to be detected.

The slave unit activation control unit 14 controls the activation of the slave unit 2. The slave unit activation control unit 14 corresponds to the activation control unit according to the claim. The start-up control of the slave unit 2 may be controlled by switching the power supply to the slave unit 2 on and off, but in the present embodiment, a case where an instruction is sent to the slave unit 2 is taken as an example. The following description will be given. The slave unit activation control unit 14 activates the slave unit 2 based on the detection of the mobile terminal 3 by the mobile terminal detection unit 13. The processing by the slave unit start control unit 14 will be described in detail later.

The terminal position estimation unit 15 estimates the position of the mobile terminal 3 with respect to the handset 2 based on the information sent from the handset 2. The processing in the terminal position estimation unit 15 will also be described in detail later.

<Outline configuration of slave unit 2>
Subsequently, an example of a schematic configuration of the slave unit 2 will be described with reference to FIG. As shown in FIG. 3, the slave unit 2 includes a power supply control unit 21, a wireless communication unit 22, and a mobile terminal detection unit 24. In FIG. 3, the description of the member having a function related to the service using wireless communication is omitted.

The power control unit 21 switches the power supply of its own device on and off according to the instruction from the master unit 1. When the power supply is switched on by the power control unit 21, the own device is activated and wireless communication is possible. On the other hand, when the power supply is switched off by the power control unit 21, the own device is stopped and wireless communication cannot be performed. As an example, the slave unit 2 may be configured to be in a sleep state until the power supply is turned on.

The wireless communication unit 22 has an antenna 23, and performs short-range wireless communication with the mobile terminal 3 with a communication range of, for example, at most several meters. The mobile terminal detection unit 24 detects the mobile terminal 3 registered in the slave unit 2 located in the communication range of the own device in the same manner as the mobile terminal detection unit 13. Further, when the mobile terminal detection unit 24 receives a radio wave from the registered mobile terminal 3, the mobile terminal detection unit 24 sends the RSSI of the radio wave to the master unit 1.

<Processing related to slave unit startup control>
Subsequently, an example of the flow of the slave unit activation control-related processing, which is the processing related to the control of the activation of the slave unit 2 in the master unit 1, will be described with reference to the flowchart of FIG. The flowchart of FIG. 4 may be configured to start when the power of the master unit 1 is turned on and end when the power of the master unit 1 is turned off, for example. If there is a switch that switches between the use of the master unit 1 and the slave unit 2 by user operation, the switch starts when the switch accepts the user operation to be used, and the switch is used to switch the user operation to be unused. It may be configured to end when it is accepted. In addition, the slave units 2a to 2c are stopped by default.

First, in step S1, the master unit 1 is activated. In step S2, the mobile terminal detection unit 13 detects the registered mobile terminal 3 (hereinafter, terminal detection). Here, the outline of the terminal detection by the mobile terminal detection unit 13 will be described with reference to the flowchart of FIG.

First, in step S21, when the wireless communication unit 11 communicates with the registered mobile terminal 3 (YES in S21), the process proceeds to step S24. On the other hand, when the communication connection with the registered mobile terminal 3 is not made (NO in S21), the process proceeds to step S22.

In step S22, when the radio wave is received from the registered mobile terminal 3 (YES in step S22), the process proceeds to step S23. On the other hand, when the radio wave is not received from the registered mobile terminal 3 (NO in step S22), the process proceeds to step S25.

In step S23, if the RSSI of the radio wave received from the registered mobile terminal 3 is equal to or greater than the threshold value (YES in step S23), the process proceeds to step S24. On the other hand, if the RSSI of the radio wave received from the registered mobile terminal 3 is less than the threshold value (NO in step S23), the process proceeds to step S25.

In step S24, it is assumed that the registered mobile terminal 3 has been detected, and the process proceeds to step S3. On the other hand, in step S25, it is assumed that the registered mobile terminal 3 has not been detected, and the process proceeds to step S3.

Returning to FIG. 4, in step S3, when the registered mobile terminal 3 is detected by the terminal detection (YES in S3), the process proceeds to step S4. On the other hand, when the registered mobile terminal 3 is not detected (NO in S3), the process returns to S2 and the process is repeated.

In step S4, the slave unit activation control unit 14 activates all the slave units 2 (that is, the slave units 2a to 2c). As an example, it is assumed that all the slave units 2 are started at the same time. The term "simultaneous" as used herein may include a deviation of an error. When the activated slave units 2a to 2c receive a radio wave from the mobile terminal 3, the activated slave units 2a to 2c send the RSSI of the radio wave to the master unit 1.

In step S5, when the RSSI is sent from the slave unit 2, the terminal position estimation unit 15 acquires the RSSI. In step S6, the position of the mobile terminal 3 with respect to the handset 2 (hereinafter referred to as the terminal position) is estimated based on the RSSI of the handset 2 acquired in S5. As an example, if the RSSI can be acquired only from one of the slave units 2a to 2c, it is estimated that the mobile terminal 3 is located at the position closest to the slave unit 2 from which the RSSI can be acquired. To do. Further, when RSSI can be acquired from a plurality of slave units 2 among the slave units 2a to 2c, it is estimated that the mobile terminal 3 is closer to the slave unit 2 having a larger RSSI value.

In step S7, the handset activation control unit 14 stops the start of the handset 2 other than the handset 2 closest to the mobile terminal 3 based on the terminal position estimated in S6. When the slave unit 2 closest to the mobile terminal 3 is the slave unit 2a, the slave unit 2a is continuously started and the slave units 2b and 2c are stopped. Then, the above-mentioned service is performed by wireless communication between the handset 2 and the mobile terminal 3 whose activation is continued.

In step S8, the mobile terminal detection unit 13 detects the terminal in the same manner as in S2. In step S9, when the registered mobile terminal 3 is detected by the terminal detection (YES in S9), the process returns to S8 and the process is repeated. On the other hand, if the registered mobile terminal 3 is not detected (NO in S9), the process proceeds to S10. In step S10, the slave unit start control unit 14 stops the slave unit 2 that has been activated, and stops all the slave units 2. Then, the process returns to S2 and the process is repeated.

Here, an example of the transition of the activation state of the master unit 1 and the slave units 2a to 2c will be described with reference to FIG. The transitions are performed in the order indicated by the arrows. In FIG. 6, a case where the mobile terminal 3 is initially located closest to the slave unit 2a and then disappears in the vicinity of the vehicle A will be taken as an example. In FIG. 6, B shows the communication range of the master unit 1, C1 shows the communication range of the slave unit 2a, C2 shows the communication range of the slave unit 2b, and C3 shows the communication range of the slave unit 2c.

At first, only the master unit 1 of the master unit 1 and the slave units 2a to 2c is activated, and the slave units 2a to 2c are stopped. Here, when the mobile terminal 3 is located in the communication range B of the master unit 1 and is detected by the terminal detection in the master unit 1, the slave units 2a to 2c are started at the same time. Subsequently, based on the RSSI of the radio waves received from the mobile terminal 3 by the activated slave units 2a to 2c, the slave unit 2a closest to the mobile terminal 3 continues to start, while the slave units 2b and 2c are stopped. To. When the mobile terminal 3 is no longer detected by the terminal detection of the master unit 1, the slave unit 2a is also stopped, and all of the slave units 2a to 2c are stopped.

<Summary of Embodiment 1>
According to the configuration of the first embodiment, the slave units 2a to 2c are not activated until the registered mobile terminal 3 is detected by the mobile terminal detection unit 13 of the master unit 1, and the registered mobile terminal 3 is registered by the mobile terminal detection unit 13. Since the slave units 2a to 2c are activated when the mobile terminal is detected, it is not necessary to keep activating the plurality of slave units 2a to 2c. Therefore, wasteful power consumption can be suppressed as compared with the case where a plurality of slave units 2a to 2c are continuously activated.

Further, the slave unit start control unit 14 activates all the slave units 2a to 2c at the same time when a plurality of slave units 2a to 2c are activated. Therefore, the time required to estimate the position of the mobile terminal 3 with respect to the slave unit 2 based on the RSSI of the slave units 2a to 2c can be shortened as compared with the case where the slave units 2a to 2c are started one by one. it can.

In addition, the slave unit activation control unit 14 continues the activation of the slave unit 2 closest to the mobile terminal 3, while stopping the other slave units 2. The handset 2 closest to the mobile terminal 3 is likely to be a handset 2 that is convenient for performing a service using wireless communication with the mobile terminal 3. Therefore, according to the configuration of the first embodiment, it is possible to suppress unnecessary power consumption by stopping other than the slave unit 2 which is convenient for performing the service using wireless communication with the mobile terminal 3. become.

Further, according to the configuration of the first embodiment, if the registered mobile terminal 3 is no longer detected by the mobile terminal detection unit 13 after the slave unit 2 is activated, all the slave units 2 are stopped. Therefore, when the registered mobile terminal 3 is not located near the vehicle A and the need for wireless communication with the slave unit 2 becomes scarce, all the slave units 2 are stopped to suppress unnecessary power consumption. It becomes possible to do.

(Modification example 1)
In the first embodiment, when the mobile terminal 3 is detected by the terminal detection by the mobile terminal detection unit 13, the slave unit activation control unit 14 starts all the slave units 2 at the same time, but the present invention is not necessarily limited to this. Absent. For example, it may be configured to start the slave units 2 one by one (hereinafter, modification 1). For convenience of explanation, in the explanations after the first modification, the members having the same functions as the members shown in the drawings used in the explanations so far are designated by the same reference numerals, and the description thereof will be omitted.

For example, in the first modification, when the mobile terminal 3 is detected by the terminal detection by the mobile terminal detection unit 13, the slave unit activation control unit 14 activates the slave units 2a to 2c in order at regular time intervals. Just let me do it. The fixed time interval referred to here is an interval that cannot be said to be simultaneous, and may be, for example, 100 msec or 1 sec.

Here, an example of the transition of the activation state of the master unit 1 and the slave units 2a to 2c in the modified example 1 will be described with reference to FIG. 7. The transitions are performed in the order indicated by the arrows. In FIG. 7, a case where the mobile terminal 3 is initially located closest to the slave unit 2a and then disappears in the vicinity of the vehicle A will be taken as an example. In FIG. 7, B shows the communication range of the master unit 1, C1 shows the communication range of the slave unit 2a, C2 shows the communication range of the slave unit 2b, and C3 shows the communication range of the slave unit 2c. Further, in FIG. 7, a case where the slave unit 2a, the slave unit 2b, and the slave unit 2c are started in this order will be described as an example.

At first, only the master unit 1 of the master unit 1 and the slave units 2a to 2c is activated, and the slave units 2a to 2c are stopped. Here, when the mobile terminal 3 is located in the communication range B of the master unit 1 and is detected by the terminal detection in the master unit 1, the slave unit 2a, the slave unit 2b, and the slave unit 2c are in that order at regular time intervals. It is started one by one. Specifically, the slave units 2b and 2c are stopped while the slave unit 2a is starting up, the slave units 2a and 2c are stopped while the slave unit 2b is starting up, and the slave unit 2a is stopped while the slave unit 2c is starting up. , 2b are stopped.

Subsequently, the slave unit 2a closest to the mobile terminal 3 is started based on the RSSI of the radio wave received from the mobile terminal 3 by the activated slave units 2a, 2b, 2c, while the slave units 2b, 2c are stopped. To. When the mobile terminal 3 is no longer detected by the terminal detection of the master unit 1, the slave unit 2a is also stopped, and all of the slave units 2a to 2c are stopped.

When the slave units 2a, the slave units 2b, and the slave units 2c are started in this order, all the slave units 2a to 2c may be started once while continuing the activation of the activated slave units 2.

(Modification 2)
The terminal detection by the mobile terminal detection unit 13 of the master unit 1 may be configured not on the condition that the RSSI of the radio wave received from the registered mobile terminal 3 is equal to or higher than the threshold value. In this case, in the flowchart of FIG. 5, the processing of S22 and S23 may be omitted, and if the result is NO in S21, the process may move to S25.

(Modification 3)
The terminal detection by the mobile terminal detection unit 13 of the master unit 1 may be configured not on the condition that the wireless communication unit 11 has a communication connection with the registered mobile terminal 3. In this case, in the flowchart of FIG. 5, the process of S21 may be omitted and the process may be shifted from S2 to S22.

(Modification example 4)
In the first embodiment, the configuration in which the master unit 1 is continuously started even when the slave unit 2 other than the slave unit 2 closest to the mobile terminal 3 is stopped is shown, but the present invention is not necessarily limited to this. For example, when the slave unit 2 other than the slave unit 2 closest to the mobile terminal 3 is stopped, the master unit 1 may also be stopped (hereinafter, modification 4).

In this configuration, when the mobile terminal 3 cannot be detected due to the terminal detection by the activated slave unit 2, the master unit 1 may be restarted and the slave unit 2 may be stopped. The restart of the master unit 1 may be performed by giving an instruction or switching the power supply to on from the activated slave unit 2. Further, the slave unit 2 may be stopped by the instruction of the slave unit 2 itself, or by the instruction of the restarted master unit 1 or the switching of the power supply to off.

According to the configuration of the modified example 4, the master unit 1 can be stopped when the slave unit 2 closest to the mobile terminal 3 and the mobile terminal 3 are performing the above-mentioned service by wireless communication. Therefore, the power consumption can be suppressed as compared with the case where the master unit 1 is activated.

The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims, and the technical means disclosed in the different embodiments can be appropriately combined. Also included in the technical scope of the present invention.

1 master unit (short-range wireless communication device), 2a, 2b, 2c slave unit (short-range wireless communication device), 3 mobile terminal, 13 mobile terminal detection unit, 14 slave unit activation control unit (startup control), 15 terminal position Estimator, 100 Near Field Communication

Claims (8)

An in-vehicle short-range wireless communication device that is mounted on a vehicle and for detecting the position of a mobile terminal.
As a device for performing short-range wireless communication by communicating with a mobile terminal located in the communication range, it has one master unit (1) and a plurality of slave units (2a, 2b, 2c).
The master unit has a communication range of the entire circumference with respect to the vehicle, and has a mobile terminal detection unit (13) that detects a mobile terminal located in the communication range.
The plurality of slave units are arranged on the right side and the left side of the vehicle, respectively, and have a communication range different from the communication range.
When the master unit itself is connected to the mobile terminal by communication, the power supply of the plurality of slave units is switched on, and the plurality of slave units start receiving radio waves from the mobile terminal. An in-vehicle short-range wireless communication device including an activation control unit (14) for detecting the position from radio waves received by a plurality of the slave units. In claim 1,
The mobile terminal detection unit is an in-vehicle short-range wireless communication device characterized in that it detects the mobile terminal because it is connected to the mobile terminal by communication. In claim 1 or 2,
The mobile terminal detection unit is an in-vehicle short-range wireless communication device, characterized in that it detects the mobile terminal when the intensity of radio waves received from the mobile terminal is equal to or higher than a threshold value. In any one of claims 1 to 3,
The activation control unit is an in-vehicle short-range wireless communication device characterized in that all of the plurality of slave units are activated at the same time. In any one of claims 1 to 4,
The activation control unit is an in-vehicle short-range wireless communication device characterized in that a plurality of the slave units are activated one by one. In any one of claims 1 to 5,
The master unit is
After the slave unit is activated by the activation control unit, when the mobile terminal detection unit no longer detects the mobile terminal, control is performed to stop the reception of radio waves by the slave unit. Near field communication device. It is a master unit that is mounted on a vehicle and is used in an in-vehicle short-range wireless communication device for detecting the position of a mobile terminal.
It is a master unit as a device that performs short-range wireless communication by communicating with a mobile terminal located in the communication range.
A mobile terminal detection unit (13) having a communication range of the entire circumference with respect to the vehicle and detecting a mobile terminal located in the communication range,
When the master unit is connected to the mobile terminal by communication, the master unit communicates with a mobile terminal located in the communication range, which is arranged on the right side and the left side of the vehicle and has a communication range different from the communication range. The power supply of a plurality of slave units as a device for performing short-range wireless communication is switched on , the plurality of slave units start receiving radio waves from the mobile terminal, and the plurality of slave units start receiving radio waves. A master unit including a start control unit (14) for detecting the position from received radio waves. It is a slave unit mounted on a vehicle and used in an in-vehicle short-range wireless communication device for detecting the position of a mobile terminal.
Of the apparatus for performing short-range wireless communication by the communication connection with the mobile terminal located in the communication range, I either handset der of which is disposed on the right and left sides of each said vehicle,
It is a slave unit that performs the position detection from the radio waves received by the plurality of vehicles arranged on the right side and the left side of the vehicle.
It has a communication range of the entire circumference of the vehicle and has a communication range different from that of the master unit that detects a mobile terminal located in the communication range.
A slave unit characterized in that when the master unit is connected to the mobile terminal by communication, the power supply is switched on and reception of radio waves from the mobile terminal is started.

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