JP5415222B2 - In-vehicle wireless communication system - Google Patents

Description

  The present invention relates to an in-vehicle wireless communication system, and more particularly to an in-vehicle wireless communication system that makes a Bluetooth connection between an in-vehicle communication device and a mobile phone.

  In recent years, wireless communication systems that enable communication between mobile phones and in-vehicle hands-free devices have been used. In this wireless communication system, a form in which a mobile phone and an in-vehicle hands-free device are connected by Bluetooth (registered trademark) is widespread.

  Bluetooth is a short-range wireless communication, and can be connected to a notebook computer or a mobile phone without using a cable, and can exchange voice and data. Further, Bluetooth can perform communication within a radius range of about 10 m to 100 m using an ISM (Industrial Science and Medical) frequency band that can be freely used without a license.

  By using a device capable of Bluetooth connection, it is possible to make a hands-free call or connect to the Internet to acquire various information and store it in an in-vehicle device.

  As described above, since Bluetooth enables wireless communication between devices at a short distance, depending on the distance between the mobile phone and the device provided in the vehicle, the user with the mobile phone has moved out of the vehicle. Even if the connection is valid. In this case, since the voice having received a hands-free call flows from a speaker installed in the vehicle, the voice cannot be heard.

  On the other hand, Patent Document 1 describes a technique for transferring a telephone function from an in-vehicle communication terminal side to a mobile communication terminal side owned by the user when the user gets off the vehicle.

JP 2007-235841 A

  As described above, when the in-vehicle communication device and the mobile phone are connected by wireless communication, when the user gets out of the vehicle, the telephone function is transferred to the mobile phone. It becomes possible to respond.

  However, for example, when the map database data is downloaded to the in-vehicle communication device or the music streaming playback is performed via the mobile phone, it functions on the mobile phone side when the user of the mobile phone gets out of the vehicle. The following inconveniences will occur if this is transferred. That is, when the downloading of the map database data is not completed, the necessary data is lost due to the function being transferred to the mobile phone in the middle. In addition, when listening to music in the vehicle interior, the sound is interrupted by the function being transferred to the mobile phone in the middle, which may cause discomfort to those who remain in the vehicle interior and listen to the music.

  The present invention has been made in view of the problems of the prior art, and in the in-vehicle communication device and the mobile phone connected via Bluetooth, even when the user of the mobile phone gets out of the vehicle, the in-vehicle communication device It is an object of the present invention to provide an in-vehicle wireless communication system that can avoid incomplete data acquisition.

The above-described problem is an in-vehicle wireless communication system in which an in-vehicle communication device and a mobile communication terminal can perform wireless communication with each other via a Bluetooth unit, and the in-vehicle communication device is carried by a user. A short-range wireless communication means for communicating with the mobile communication terminal, and analyzing the signal from the sensor to determine that the user has exited the vehicle, the mobile communication terminal and the vehicle-mounted Control means for continuing or disconnecting a short-range wireless communication connection in accordance with a Bluetooth profile communicating with the communication terminal via the short-range wireless communication means, and the control means includes the Bluetooth When the profile of HFP is HFP (Hands-Free Profile), the short-range wireless communication connection is disconnected and the Bluetooth profile is DUN (Dial-up Profile). In the case of (Networking Profile), it is determined whether or not data is being downloaded. If the data is not being downloaded, the problem is solved by the in- vehicle wireless communication system that disconnects the short-range wireless communication connection .

In-vehicle radio communication system according to this embodiment, the control means, wherein a Bluetooth profile DUN, when downloading data, after completion downloading of the data, so as to cut the short-range wireless communication connection It may be.

  In the in-vehicle wireless communication system according to this aspect, the control unit disconnects the short-range wireless communication connection when the Bluetooth profile is A2DP (Advanced Audio Distribution Profile) and the music is not being reproduced. The control means may disconnect the short-range wireless communication connection after the reproduction of the music is completed when the Bluetooth profile is A2DP and the music is being reproduced. .

  According to the in-vehicle wireless communication system of the present invention, it is determined whether or not a user who has a mobile phone has got out of the vehicle, and when the vehicle gets out of the vehicle, the Bluetooth profile is connected to the in-vehicle device by short-range wireless communication. In response to this, the connection of the short-range wireless communication is continued or disconnected.

  For example, when the Bluetooth profile is DUN, if data is being downloaded, the short-range wireless communication connection is not disconnected until the download is completed, and is disconnected when the download is completed.

  As a result, when a user who has a mobile phone gets out of the vehicle, the short-range wireless communication (Bluetooth) connection is not suddenly disconnected, and the loss of data being downloaded can be prevented.

It is a block diagram which shows the structure of the radio | wireless communications system which concerns on one Embodiment of this invention. It is a block diagram which shows the structure of the Bluetooth unit in the radio | wireless communications system of FIG. It is a flowchart which shows an example of the optimal cutting | disconnection process of a Bluetooth connection.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 shows a block diagram of an in-vehicle wireless communication system 100 according to an embodiment of the present invention.

  The in-vehicle wireless communication system 100 according to the present embodiment includes an in-vehicle communication device 10 and a mobile phone 20, and a short distance between the in-vehicle communication device 10 and the mobile phone 20 by Bluetooth (Bluetooth: registered trademark). They are connected so that they can communicate with each other by wireless communication. The mobile phone 20 can be connected to the Internet or the like.

  The in-vehicle communication device 10 includes a Bluetooth unit (Bluetooth unit) 11, an electronic volume 12, an amplifier 13, a control unit 14, a storage unit 15, an operation unit 16, a sensor 17, a microphone 18, and a speaker 19. And a communication unit (BT (Bluetooth) antenna) 31.

  The Bluetooth unit 11 is a unit capable of transmitting and receiving via Bluetooth, and exchanges data with an external Bluetooth device. For example, when receiving data from an external Bluetooth device, such as when receiving a call using the hands-free function of a mobile phone or receiving music data from a portable audio player, audio data transmitted from an external Bluetooth device or Music data is received by the BT antenna 31, audio signals are generated by performing predetermined signal processing on the audio data and music data, and supplied to the electronic volume 12.

  In addition, for example, when transmitting data to an external Bluetooth device, such as when speaking using a hands-free function of a mobile phone, the microphone 18 acquires sound and converts it into a sound signal, and the converted sound signal Is supplied to the Bluetooth unit 11. The Bluetooth unit 11 performs predetermined signal processing on the audio signal to generate audio data, and transmits the audio data to an external Bluetooth device via the antenna 31.

  The electronic volume 12 adjusts the volume by amplifying the audio signal supplied from the Bluetooth unit 11 based on the control of the control unit 14.

  The amplifier 13 amplifies the audio signal supplied from the electronic volume 12 to a predetermined volume, and supplies the amplified audio signal to the speaker 19. The speaker 19 outputs the supplied audio signal to the outside.

  The operation unit 16 includes various buttons and transmits an operation signal corresponding to an operation instructed by the user to the control unit 14.

  The microphone 18 acquires the user's utterance and transmits a signal to the Bluetooth unit 11.

  The sensor 17 detects whether or not a driver is in the driver's seat. For example, a seat sensor using a weight sensor is provided in the seat of the driver's seat, and a signal corresponding to the driver's seating is generated and transmitted to the control unit 14. Moreover, the camera apparatus which detects a driver | operator's presence may be sufficient, and the ultrasonic sensor which has arrange | positioned the person (driver | operator) so that detection is possible may be sufficient.

  The control unit 14 is composed of a microcomputer, and controls the functions of the respective units. In this embodiment, the signal from the sensor 17 is received to determine whether or not the user has got off the vehicle, and when it is determined that the user has got off, the in-vehicle communication device 10 and the mobile phone 20 are in communication with each other. In accordance with the distance wireless communication profile, it is determined whether to continue or disconnect the communication.

  On the other hand, the mobile phone 20 includes a Bluetooth unit 21, a display unit 22, a control unit 23, a communication unit 24, an operation unit 25, a microphone 26, a speaker 27, and a short-range wireless communication BT (Bluetooth). The antenna 32 is basically composed of an antenna 32 and an antenna 33 for wireless communication with a base station (not shown).

  The Bluetooth unit 21 has basically the same configuration as the Bluetooth unit 11 of the in-vehicle communication device 10 and can perform near field communication with the in-vehicle device 10 via the BT antenna 32 and the Bluetooth unit 21.

  The communication unit 24 and the antenna 33 are connected to the Internet via a base station and a telephone network (not shown), and perform voice and data communication with other mobile phones.

  The operation unit 25 is provided with various operation buttons and instructs various functions for the mobile phone 20.

  The display unit 22 is composed of, for example, an LCD, and displays the contents of an e-mail or displays an image.

  The microphone 26 acquires the speech voice and converts it into a voice signal, and the speaker 27 outputs the voice received from another mobile phone.

  The control unit 23 is composed of a microcomputer and controls the functions of the above-described units.

  FIG. 2 is a diagram showing a block configuration of the Bluetooth units 11 and 21. The Bluetooth units 11 and 21 are devices constituting an RF (Radio Frequency) layer and a BB (Base Band) layer below the HCI (host control interface) of the Bluetooth protocol layer.

  Each Bluetooth unit includes an antenna 47 including a chip antenna for the 2.4 GHz band, an RF circuit (Bluetooth RF controller 41) for raising and lowering the frequency in order to perform frequency hopping in the 2.4 GHz band, and a frequency hopping type spread spectrum. A base band (control unit 43) that performs packet wireless communication by a communication method and a ROM 42 such as a flash memory or an EEPROM that records the protocol of the communication method are provided.

  The host controller 44 controls the entire device including the Bluetooth units 11 and 21. In FIG. 1, it corresponds to each control unit of the in-vehicle communication device 10 or the mobile phone 20.

  The host controller 44 includes an HCI (Host Controller Interface) port, and is connected to the Bluetooth unit via an interface such as a UART (Universal Asynchronous Receiver Transmitter) or a USB (Universal Serial Bus).

  The CODEC 45 performs CODE / DECODE conversion of the PCM signal and inputs / outputs telephone voice. The PCM signal is converted into an analog signal by the DAC 46, and a stream music reproduction signal is output.

  Next, a profile in Bluetooth will be described. Since Bluetooth can be used for communication with various electronic devices, a protocol called a profile corresponding to the function of the electronic device has been established. The profile includes a profile that is always mounted on the electronic device and a profile that is mounted according to the function of the electronic device. When communicating between electronic devices, it is assumed that they have the same profile.

  The profile that is always installed in the electronic device is, for example, a profile that is first required when connecting various electronic devices, and establishes recognition and security of the electronic device that is required when connecting the electronic device. There is a GAP (Generic Access Profile) for setting a procedure.

  Examples of profiles mounted according to the functions of electronic devices include HFP (Hands-Free Profile) for realizing hands-free calling of mobile phones in the car, headphones with receivers and in-vehicle devices for music. There is an A2DP (Advanced Audio Distribution Profile) for transmission to the network.

  In the in-vehicle wireless communication system 100 configured as shown in FIG. 1, the Bluetooth connection between the in-vehicle communication device 10 and the mobile phone 20 is performed immediately after the power is turned on. One is a master and the other is a slave, and the master and slave are connected through a synchronization establishment phase and a communication connection phase.

  When the in-vehicle communication device 10 and the mobile phone wearer 20 are connected via Bluetooth, Bluetooth profiles executed by the control unit 14 of the in-vehicle communication device 10 are shown. When a desired profile is selected, information on the selected profile is stored in the storage unit 15.

  For example, when a hands-free profile is selected, the mobile phone 20 can be talked without hand. At this time, the mobile phone 20 converts the analog audio signal into a digital audio packet by CODEC, and transmits the audio packet to the in-vehicle communication device 10 via the Bluetooth unit 21 and the antenna 32.

  In addition, the cellular phone 20 receives the audio packet transmitted from the in-vehicle communication device 10 via the antenna 32 and the Bluetooth unit 21 and transmits the audio packet to the outside via the communication unit 24 and the antenna 33.

  On the other hand, the in-vehicle communication device 10 receives an audio packet transmitted from the mobile phone 20 via the antenna 31 and the Bluetooth unit 11, converts the audio packet into an analog audio signal by the CODEC 45, and supplies the analog audio signal to the speaker 19. .

  Further, the in-vehicle communication device 10 converts an analog audio signal of the user's uttered voice input via the connected microphone 18 into a digital audio packet by the CODEC 56, and the audio packet is converted to the Bluetooth unit 11 and the antenna 31. Via the mobile phone 20.

  Hereinafter, an optimal disconnection process for short-range wireless communication connection performed by the control unit 14 of the in-vehicle communication device 10 in the in-vehicle wireless communication system 100 will be described with reference to the flowchart of FIG. 3. In this process, it is assumed that the mobile phone 20 and the in-vehicle communication device 10 are connected by short-range wireless communication.

  First, in step S11 of FIG. 3, a signal from the person detection sensor 17 is acquired.

  In the next step S12, it is determined whether or not the target user is outside the vehicle. For example, when the target user is a driver and the person detection sensor 17 is a seat sensor provided in the driver's seat, the signal is close to zero with respect to the pressure signal in the state where the driver is seated. When it is determined that the driver has got off the vehicle. When it is determined that the target user has gone out of the vehicle, the process proceeds to step S13. When it is determined that the target user is in the vehicle interior, the process returns to step S11 and the determination is continued.

  In the next step S13, Bluetooth profile information established with the mobile phone 20 is acquired. This profile information is acquired by referring to the storage unit 15 selected and stored when the Bluetooth connection is established.

  In the next step S14, it is determined whether or not the Bluetooth profile is HFP (Hands-Free Profile). When the Bluetooth profile is HFP, the process proceeds to step S15 to disconnect the short-range wireless communication connection. If the profile is not HFP, the process proceeds to step S16. HFP is a profile for realizing hands-free calling in a vehicle or in a headset. When the profile is HFP, it is in a state of performing hands-free phone. Therefore, when the user using the mobile phone 20 gets off the vehicle, if the short-range wireless communication connection is enabled, the user I cannot hear the voice of. For this reason, the short-range wireless communication connection is disconnected, and the telephone function is shifted to the mobile phone 20.

  In the next step S16, it is determined whether or not the profile is DUN. When the profile is not DUN, the process proceeds to step S19, and when the profile is DUN (Dial-up Networking Profile), the process proceeds to step S17. DUN is a profile for dial-up connection to the Internet via a mobile phone / PHS.

  In the next step S17, it is determined whether or not data is being downloaded. If the data is not being downloaded, the process proceeds to step S15, and the near field communication connection is disconnected. Even if the cellular phone 20 is dial-up connected, if data is not downloaded, data loss will not occur even if the connection is disconnected. When data is being downloaded, the process proceeds to step S18.

  In the next step S18, it is determined whether or not the data download is completed. If the download is not completed, the process waits. If the download is completed, the process proceeds to step S15 to disconnect the short-range wireless communication connection.

  As described above, even if the user goes out of the vehicle during data download, it is possible to prevent data from being lost by continuing to download data within the range of short-range wireless communication. Further, by disconnecting the short-range wireless communication after the download is completed and transferring the telephone function to the mobile phone, it is possible to respond immediately when the mobile phone 20 is called.

  In step S19, it is determined whether or not the profile is A2DP (Advanced Audio Distribution Profile). A2DP is a profile for transmitting audio to headphones with a receiver. When the profile is not A2DP, the process proceeds to step S15, and the near field communication is disconnected. When the profile is A2DP, the process proceeds to step S20.

  In the next step S20, it is determined whether or not the music is being reproduced. When the music is being reproduced, the process proceeds to step S21. When the music is not being reproduced, the process proceeds to step S15, and the near field communication is disconnected.

  In the next step S21, it is determined whether or not the reproduction of the music has been completed. The process waits until the reproduction of the music is completed. When the reproduction is completed, the process proceeds to step S15 and the short-range wireless communication is disconnected.

  As described above, according to the in-vehicle wireless communication system of the present embodiment, it is determined whether or not the user who has the mobile phone has got out of the vehicle, and when the user gets out of the vehicle, the in-vehicle device and the short-range wireless communication The connection of the short-range wireless communication is continued or disconnected according to the Bluetooth profile connected by.

  For example, when the Bluetooth profile is DUN, if data is being downloaded, the short-range wireless communication connection is not disconnected until the download is completed, and is disconnected when the download is completed.

  As a result, when a user who has a mobile phone gets out of the vehicle, the short-range wireless communication (Bluetooth) connection is not suddenly disconnected, and the loss of data being downloaded can be prevented.

  In the present embodiment, in the case of music reproduction, the case of reproducing one music has been described, but the present invention can also be applied to the case of reproducing all music. In this case, after the reproduction of one song is completed, the next song is continuously reproduced.

  Also, in the case of playing one song, it may be detected that the user who got off the vehicle has returned to the vehicle and asked whether to play the music that was listened to when getting off or to play the next song. . This inquiry may be displayed by selecting it on the display screen or may be selected by voice response.

10: In-vehicle communication device,
11, 21 ... Bluetooth unit (short-range wireless communication means),
12 ... Electronic volume,
13 ... Amplifier,
14 ... Control part (control means),
15 ... storage part,
16, 25 ... operation unit,
17 ... sensor,
18, 26 ... Mike,
19, 27 ... Speakers,
20 ... mobile phone (mobile communication terminal),
22 ... display part,
23. Control unit,
24 ... communication section,
100: In-vehicle wireless communication system.

Claims (4)

An in-vehicle wireless communication system in which an in-vehicle communication device and a mobile communication terminal can perform wireless communication with each other via a Bluetooth unit,
The in-vehicle communication device is
A sensor that senses when the user is on board,
Short-range wireless communication means for communicating with the mobile communication terminal;
A Bluetooth profile communicating between the mobile communication terminal and the in-vehicle communication terminal via the short-range wireless communication means when analyzing the signal from the sensor and determining that the user has exited the vehicle and a control means for performing continuous or disconnection of short-range wireless communication connection in accordance with the
The control means disconnects the short-range wireless communication connection when the Bluetooth profile is HFP (Hands-Free Profile), and downloads data when the Bluetooth profile is DUN (Dial-up Networking Profile). An in- vehicle wireless communication system characterized by determining whether or not data is being downloaded and disconnecting the short-range wireless communication connection if data is not being downloaded . Said control means, said a Bluetooth profile DUN, when downloading data, vehicle according to After downloading of the data, to claim 1, characterized in that cutting the short-range wireless communication connection Wireless communication system. 3. The in-vehicle use according to claim 2 , wherein the control unit disconnects the short-range wireless communication connection when the Bluetooth profile is A2DP (Advanced Audio Distribution Profile) and the music is not being reproduced. Wireless communication system. Said control means, said a Bluetooth profile A2DP, when playing music, after regeneration completion of the music, according to claim 3, characterized in that cutting the short-range wireless communication connection In-vehicle wireless communication system.

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