WO2020077658A1 - 用于蓝牙设备的扩展连接方法和扩展连接系统 - Google Patents

用于蓝牙设备的扩展连接方法和扩展连接系统 Download PDF

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Publication number
WO2020077658A1
WO2020077658A1 PCT/CN2018/111623 CN2018111623W WO2020077658A1 WO 2020077658 A1 WO2020077658 A1 WO 2020077658A1 CN 2018111623 W CN2018111623 W CN 2018111623W WO 2020077658 A1 WO2020077658 A1 WO 2020077658A1
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Prior art keywords
bluetooth device
bluetooth
connection
extended
external
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PCT/CN2018/111623
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English (en)
French (fr)
Inventor
李雨轩
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北京轩辕联科技有限公司
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Application filed by 北京轩辕联科技有限公司 filed Critical 北京轩辕联科技有限公司
Priority to KR1020217014180A priority Critical patent/KR20210091154A/ko
Priority to EP18937362.4A priority patent/EP3869760A4/en
Priority to US17/285,480 priority patent/US20210345081A1/en
Priority to JP2021546408A priority patent/JP2022512019A/ja
Publication of WO2020077658A1 publication Critical patent/WO2020077658A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • H04B1/7156—Arrangements for sequence synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/50—Network services
    • H04L67/56—Provisioning of proxy services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/50—Network services
    • H04L67/56—Provisioning of proxy services
    • H04L67/565—Conversion or adaptation of application format or content
    • H04L67/5651—Reducing the amount or size of exchanged application data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/18—Multiprotocol handlers, e.g. single devices capable of handling multiple protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H04W4/48—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for in-vehicle communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/14—Direct-mode setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
    • H04W84/20—Master-slave selection or change arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
    • H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
    • H04B2201/713—Frequency hopping
    • H04B2201/71346—Bluetooth

Definitions

  • the present application relates to the field of extended connection and data transmission between multiple Bluetooth devices, and in particular, to an extended connection method for Bluetooth devices and an extended connection system for Bluetooth devices.
  • an in-vehicle central control system with comprehensive processing capabilities is usually provided.
  • the in-vehicle central control system usually provides in-vehicle Bluetooth.
  • Module to establish Bluetooth connection with various Bluetooth devices The implementation mechanism of the Bluetooth module in the car is the same as the Bluetooth module of the mobile phone, and has the same transmission system.
  • in-vehicle Bluetooth is an in-vehicle wireless communication system designed and developed based on wireless Bluetooth technology, mainly to connect the in-vehicle Bluetooth module with a mobile phone through a Bluetooth connection, so as to realize calls, audio playback, Various applications such as voice navigation.
  • the connection is switched by connecting the external Bluetooth interface circuit to the mobile phone, for example, through the external Bluetooth interface of the mobile phone with two sets of Bluetooth receiving circuits and a switch
  • the circuit is used to realize the communication connection between the mobile phone and the Bluetooth headset, the mobile phone and the car Bluetooth device.
  • the mobile phone can only establish a connection with one of the Bluetooth devices at the same time, and data transmission between the two Bluetooth devices cannot be achieved.
  • the present application relates to an extended connection method for a Bluetooth device, which includes: initializing a first Bluetooth device, setting the first Bluetooth device to a main mode; Establish a first Bluetooth connection between the second Bluetooth devices; and monitor whether there is an external Bluetooth device connected to the second Bluetooth device, wherein in the case of establishing a second Bluetooth connection between the external Bluetooth device and the second Bluetooth device, pass The first Bluetooth connection and the second Bluetooth connection perform data transmission between the first Bluetooth device and the external Bluetooth device.
  • the steps include:
  • the first Bluetooth device is set as a master mode
  • the second Bluetooth device is set as a slave mode
  • the external Bluetooth device is set as a master mode
  • the first Bluetooth connection is a transparent serial port connection based on the SPP protocol
  • the second Bluetooth connection is a connection based on the A2DP protocol
  • the first Bluetooth connection and the second Bluetooth connection are both connections based on the A2DP protocol.
  • the extended connection method according to an embodiment of the present application, wherein the step of processing the received data stream at the second Bluetooth device includes: performing data processing on the received data stream through the second Bluetooth device compression.
  • the extended connection method wherein the step of transmitting the processed data stream from the second Bluetooth device to the first Bluetooth device through the first Bluetooth connection includes:
  • the step of establishing a first Bluetooth connection between the first Bluetooth device and the second Bluetooth device in the slave mode includes:
  • the first Bluetooth device sends a connection request message according to the pre-stored identification information of the second Bluetooth device
  • the second Bluetooth device sends a corresponding connection response message when receiving the connection request message
  • the first Bluetooth device When receiving the connection response message from the second Bluetooth device, the first Bluetooth device sends a frequency modulation synchronization (FHS) data packet.
  • FHS frequency modulation synchronization
  • the step of establishing a first Bluetooth connection between the first Bluetooth device and the second Bluetooth device in the slave mode includes:
  • the first Bluetooth device sends an inquiry message
  • the second Bluetooth device enters a query scan state, and sends a query response message when receiving a query message sent from the first Bluetooth device;
  • the first Bluetooth device When receiving the query response message from the second Bluetooth device, the first Bluetooth device establishes a connection with the second Bluetooth device.
  • an extended connection system for a Bluetooth device which includes: a first Bluetooth device, the first Bluetooth device is set as a main mode; a second Bluetooth device, the second The Bluetooth device is set to the slave mode; and the external Bluetooth device, wherein the external Bluetooth device is set to the master mode, wherein there is a first Bluetooth connection between the first Bluetooth device and the second Bluetooth device, and the external Bluetooth device There is a second Bluetooth connection with the second Bluetooth device, wherein data transmission is performed between the first Bluetooth device and the external Bluetooth device through the first Bluetooth connection and the second Bluetooth connection.
  • the external Bluetooth device transmits the data stream to the second Bluetooth device through the second Bluetooth connection
  • the second Bluetooth device pairs the received data Stream processing
  • the second Bluetooth device transmits the processed data stream to the first Bluetooth device through the first Bluetooth connection
  • the first Bluetooth connection is a transparent serial port connection based on SPP protocol
  • the second Bluetooth connection is a connection based on A2DP protocol
  • the second Bluetooth device is configured to perform data compression on the received data stream.
  • the second Bluetooth device sends a handshake request to the first Bluetooth device, and a successful handshake between the first Bluetooth device and the second Bluetooth device And the second Bluetooth device transmits the compressed data stream to the first Bluetooth device.
  • the first Bluetooth device sends a connection request message according to the identification information of the second Bluetooth device, and the second Bluetooth device sends a corresponding connection response when receiving the connection request message Message, and the first Bluetooth device sends a frequency modulation synchronization (FHS) data packet when it receives a connection response message from the second Bluetooth device.
  • FHS frequency modulation synchronization
  • the identification information of the second Bluetooth device is pre-stored in the first Bluetooth device.
  • a slot for accommodating the second Bluetooth device is provided in the first Bluetooth device, a PIN pin assembly is provided in the slot, and the second Bluetooth device The device is provided with a jack that cooperates with the PIN pin assembly, wherein the first Bluetooth device obtains identification information of the second Bluetooth device through the PIN pin assembly.
  • the second Bluetooth device is a Bluetooth headset.
  • the second Bluetooth device enters an inquiry scan state and receives an inquiry message sent from the first Bluetooth device When sending an inquiry response message, and when the first Bluetooth device receives an inquiry response message from the second Bluetooth device, it establishes a connection with the second Bluetooth device.
  • a computer-readable storage medium that stores a computer program that executes the foregoing extended connection method.
  • the extended Bluetooth connection provided in the embodiments of the present application can provide required data between more than two Bluetooth devices
  • the transmission channel and corresponding node control can be applied to more complex application scenarios and provide solutions that are more in line with user needs.
  • FIG. 1 is a schematic block diagram of an extended connection system 100 for Bluetooth devices according to an embodiment of the present application
  • FIG. 2 is a flowchart of an extended connection method for a Bluetooth device according to an embodiment of the present application
  • FIG. 3 is a flowchart of audio data transmission between a Bluetooth headset and an on-vehicle Bluetooth device through an A2DP connection according to an embodiment of the present application;
  • FIG. 4 is an exemplary flowchart of an extended connection system transmitting audio stream data through a first Bluetooth connection according to an embodiment of the present application
  • FIG. 6 shows a processing routine on the side of the in-vehicle Bluetooth device in the first Bluetooth connection.
  • installation should be understood in a broad sense.
  • it can be a fixed connection, a detachable connection, or a one-piece construction; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it is one of two devices, elements, or components Inter-connectivity.
  • the specific meanings of the above terms in this application can be understood according to specific circumstances.
  • an extended connection system 100 for a Bluetooth device includes: a first Bluetooth device 10, and the first Bluetooth device 10 is set to a main mode ; The second Bluetooth device 20, the second Bluetooth device 20 is set to the slave mode; and the external Bluetooth device 30, wherein the external Bluetooth device 30 is set to the master mode, wherein the first Bluetooth device 10 and the second Bluetooth There is a first Bluetooth connection between the devices 20, and there is a second Bluetooth connection between the external Bluetooth device 30 and the second Bluetooth device 20, wherein the first Bluetooth connection and the second Bluetooth connection A Bluetooth device 10 and the external Bluetooth device 30 perform data transmission.
  • the car Bluetooth device is an example of the first Bluetooth device 10
  • the Bluetooth headset is the first Two examples of the Bluetooth device 20
  • the above-mentioned smartphone with Bluetooth function is taken as an example of the external Bluetooth device 30.
  • the term "external Bluetooth device” here means that the Bluetooth device is any device used by the user (in this example, a smartphone), as long as the device has a general Bluetooth function.
  • the external Bluetooth device can establish a second Bluetooth connection with the second Bluetooth device in the matching mode (a Bluetooth headset in this example) through the normal paging connection (PAGE); in the above example, the smartphone can connect through the matching ( Knowing the identification information of the corresponding device), query scanning or any other suitable method to establish a connection with the Bluetooth headset within the communication distance.
  • an in-vehicle Bluetooth device as an example of a first Bluetooth device can additionally establish a first Bluetooth connection with a Bluetooth headset, thereby implementing an extended Bluetooth connection.
  • extended connection here refers to the Bluetooth connection between two commonly used devices. According to the technical solution of the embodiment of the present application, a Bluetooth connection is established between more than two Bluetooth devices, thereby providing a Bluetooth link Expansion, expansion in data transmission methods, and the resulting expansion in compliance with complex application scenarios.
  • the extended Bluetooth connection provided in the embodiments of the present application can provide required data between more than two Bluetooth devices
  • the transmission channel and corresponding node control can be applied to more complex application scenarios and provide solutions that are more in line with user needs.
  • the Bluetooth headset may be set to the slave mode, which can establish a connection with any external Bluetooth device set to the master mode.
  • the external Bluetooth device may be a user's smartphone, and existing smartphones usually provide support for the A2DP audio transmission protocol.
  • A2DP Advanced Audio Distribution Profile
  • This protocol is suitable for the transmission of high-quality audio data. Specifically, it uses the ACL asynchronous connectionless link established at the L2CAP layer to transmit high-quality mono channels. Or stereo audio data. Based on the A2DP protocol to establish a connection between a smartphone and a Bluetooth headset, the chip in the headset can be used to stack data to achieve high-definition presentation of the transmitted audio data.
  • the vehicle-mounted Bluetooth device when the Bluetooth headset is located in the car, the user holds the smartphone to enter the communication range of the Bluetooth headset, or the Bluetooth headset and the smartphone are both carried by the user, so that the Bluetooth connection has been established, when the user starts the vehicle, After the vehicle-mounted system is powered on and started, the vehicle-mounted Bluetooth device will additionally establish a connection with the Bluetooth headset through the following process.
  • the connection between two Bluetooth devices is as follows. First, the main unit uses GIAC and DIAC to query Bluetooth devices within a certain range (to query sub-status). If the nearby Bluetooth device is listening to these queries (inquiry scan sub-state), it will respond to the main unit by sending its own address and clock information (FHS data packet) to the main unit (inquiry response sub-state). After sending this information, the slave unit starts listening for paging messages (page scan) from the master unit. After discovering Bluetooth devices in range, the main unit can page these devices (paging sub-state) to establish a connection.
  • FHS data packet address and clock information
  • the slave unit After sending this information, the slave unit starts listening for paging messages (page scan) from the master unit. After discovering Bluetooth devices in range, the main unit can page these devices (paging sub-state) to establish a connection.
  • the slave unit can immediately respond with its own device access code (DAC) (the slave unit responds to the sub-state).
  • DAC device access code
  • the master unit After the master unit receives the response from the slave unit, it can transmit the real-time clock, BD_ADDR, BCH parity bit and device type (FHS data packet) of the master unit as the response. After the slave unit receives the FHS data packet, the master unit and the slave unit enter the connected state.
  • the process of establishing a connection of a Bluetooth device mainly involves the following states:
  • This sub-state is used by the master unit to activate and connect the slave unit.
  • the master unit sends out a paging message by transmitting the device access code (DAC) of the slave unit in different frequency hopping channels.
  • DAC device access code
  • Page scan In this sub-state, the slave unit listens to its own device access code (DAC) within a window scan lifetime. Within this scan window, the slave unit listens with a single frequency hopping (derived from its paging frequency hopping sequence).
  • DAC device access code
  • Slave unit response The slave unit responds to the paging message of its master unit in this sub-state. If the slave unit in the paging scan sub-state is related to the master unit paging message, it enters this state. The slave unit enters the connected state after receiving the FHS data packet from the master unit.
  • Master unit response The master unit enters this sub-state after receiving a response from the slave unit to its paging message. If the slave unit replies to the master unit, the master unit sends FHS data packets to the slave unit, and then the master unit enters the connected state.
  • Inquiry is used to discover the identity of neighboring Bluetooth devices.
  • the discovery unit collects the Bluetooth device address and the clocks of all units that respond to the query message.
  • Inquiry Scan Inquiry Scan: In this state, the Bluetooth device listens to inquiries from other devices. At this time, the scanning device can listen to the general inquiry access code (GIAC) or the special inquiry access code (DIAC).
  • GIAC general inquiry access code
  • DIAC special inquiry access code
  • Inquiry response For the query, only the slave unit can respond and the master unit cannot.
  • the slave unit responds with an FHS data packet, which contains the device access code, internal clock, and some other slave unit information of the slave unit.
  • a typical paging process proceeds as follows:
  • One device (source) pages another device (destination) and is in the paging state (Page state).
  • the destination device receives the page and is in the page scan state (Page Scan State).
  • the destination device sends a reply to the source device, which is in the slave device response state (Slave Response state).
  • the source device sends the FHS packet to the destination device, which is in the master device response state (Master Response state).
  • the destination device sends a second reply to the source device, which is in the slave device response state (Slave Response state).
  • the destination and the source device switch and adopt the parameters of the source channel. At this time, they are in the response state of the master device and the response state of the child device.
  • the first Bluetooth connection established between the first Bluetooth device (vehicle Bluetooth device) and the second Bluetooth device (Bluetooth headset) is a transparent serial port connection based on the SPP protocol.
  • the second Bluetooth connection established between the headset) and the external Bluetooth device (smartphone) is a connection based on the A2DP protocol.
  • the extended connection system when using the extended connection system for a Bluetooth device according to the present application, for example, the user needs to play the audio of the mobile phone through the speaker of the vehicle-mounted device, in this case, the device for the Bluetooth device according to the present application
  • the extended connection system can provide a connection mode that can meet the specific needs of users.
  • the extended connection system of the present application is configured to use different connection protocols to establish the first Bluetooth device (vehicle Bluetooth device) and the second A first Bluetooth connection between a Bluetooth device (Bluetooth headset) and a second Bluetooth connection between a second Bluetooth device (Bluetooth headset) and an external Bluetooth device (smartphone).
  • the second Bluetooth connection between the external Bluetooth device and the Bluetooth headset should be a conventional connection method between known Bluetooth devices.
  • This connection is a Bluetooth connection that is not affected by the extended connection system of this application.
  • the second Bluetooth connection is a connection based on the A2DP protocol, and is used to transmit a high-quality audio stream between an external Bluetooth device and a Bluetooth headset.
  • the external Bluetooth device taking the user's smartphone as an example is set as the master mode, and is used as the transmission source of audio stream data in the A2DP protocol, while the Bluetooth headset is set as the slave mode, In the A2DP protocol as the sink of audio stream data.
  • the Bluetooth headset (second Bluetooth device) as the intermediate node is set to the slave mode, in the first Bluetooth connection established between the Bluetooth headset and the car Bluetooth device in the master mode, the A2DP protocol cannot be used to transmit audio streams Data: Because the Bluetooth headset is set as the sink of the audio streaming data at this time, and the on-vehicle Bluetooth device is set as the transmission source of the audio streaming data.
  • a transparent serial port connection based on the SPP protocol is used as the first Bluetooth connection.
  • FIG. 4 is an exemplary flowchart of an extended connection system transmitting audio streaming data through a first Bluetooth connection according to an embodiment of the present application.
  • step S41 of the flowchart shown in FIG. 4 the in-vehicle Bluetooth device confirms whether the link between it and the Bluetooth headset (ie, the first Bluetooth connection) is successfully established.
  • the audio stream data previously received from the external Bluetooth device can be transmitted from the Bluetooth headset side to the car Bluetooth device side.
  • step S42 the Bluetooth headset detects whether to output an audio stream
  • the Bluetooth headset compresses the audio stream data in step S43;
  • step S44 the Bluetooth headset sends an audio transmission handshake request to the in-vehicle Bluetooth device
  • step S45 the in-vehicle Bluetooth device confirms whether the handshake is successful, and sends a message indicating "audio transmission is ready” if the handshake is successful;
  • step S46 the Bluetooth headset sends audio data to the in-vehicle Bluetooth device.
  • FIG. 5 shows the processing routine of the Bluetooth headset side in the first Bluetooth connection, which includes establishing an audio transmission handshake with the on-board Bluetooth device side and compressing the audio stream data received from the external Bluetooth device Processing and the steps of sending the compressed audio stream data to the car Bluetooth device;
  • Figure 6 shows the processing routine of the car Bluetooth device side in the first Bluetooth connection, which includes the establishment from the car Bluetooth device side and the Bluetooth headset side Audio transmission handshake, receiving audio stream data after compression processing and decoding processing, and playing audio using the speaker on the side of the car Bluetooth device.
  • the user of the Bluetooth headset does not want to send the audio from the smartphone to the car device for speaker playback, but instead sends the audio on the car device side (either local audio or FM broadcast, Or the audio received from the Internet) is sent to the Bluetooth headset for playback.
  • the prerequisite for this application scenario is that the Bluetooth headset is worn by the user.
  • the second Bluetooth connection between them may be all connections based on the A2DP protocol.
  • step S31 the in-vehicle Bluetooth device is set as the A2DP data transmission source (A2DP source);
  • step S32 the Bluetooth headset detects whether the link between the in-vehicle Bluetooth device and the Bluetooth headset is successfully established. At this time, the Bluetooth headset is set as the A2DP receiver (A2DP sink);
  • step S33 the in-vehicle Bluetooth device detects whether there is an audio stream to be output
  • step S34 the Bluetooth headset receives the audio stream data transmitted from the in-vehicle Bluetooth device, and uses the built-in speaker of the Bluetooth headset for music playback.
  • the extended Bluetooth connection system provided in the embodiments of the present application can realize the provision of all devices between more than two Bluetooth devices.
  • the required data transmission channel and corresponding node control, in which the expanded / added Bluetooth link can establish a connection with the appropriate Bluetooth protocol, so that it can be adapted to specific application scenarios and provide a data transmission solution that meets the specific needs of users.
  • an extended connection method for a Bluetooth device is also provided. As shown in FIG. 2, the extended connection method includes:
  • S1 Initialize the first Bluetooth device, and set the first Bluetooth device as the main mode
  • an in-vehicle Bluetooth device is taken as an example of a first Bluetooth device
  • a Bluetooth headset is taken as an example of a second Bluetooth device
  • a smartphone with Bluetooth function is taken as an example of an external Bluetooth device.
  • An extended connection method wherein the step of performing data transmission between the first Bluetooth device and the external Bluetooth device through the first Bluetooth connection and the second Bluetooth connection includes:
  • the first Bluetooth device is set as a master mode
  • the second Bluetooth device is set as a slave mode
  • the external Bluetooth device is set as a master mode
  • the first Bluetooth connection is a transparent serial port connection based on the SPP protocol
  • the second Bluetooth connection is a connection based on the A2DP protocol
  • the first Bluetooth connection and the second Bluetooth connection are both connections based on the A2DP protocol.
  • the extended connection method according to an embodiment of the present application, wherein the step of processing the received data stream at the second Bluetooth device includes: performing data processing on the received data stream through the second Bluetooth device compression.
  • the step of transmitting the processed data stream from the second Bluetooth device to the first Bluetooth device through the first Bluetooth connection includes:
  • the step of establishing a first Bluetooth connection between the first Bluetooth device and the second Bluetooth device in the slave mode includes:
  • the first Bluetooth device sends a connection request message according to the identification information of the second Bluetooth device
  • the second Bluetooth device sends a corresponding connection response message when receiving the connection request message
  • the first Bluetooth device When receiving the connection response message from the second Bluetooth device, the first Bluetooth device sends a frequency modulation synchronization (FHS) data packet.
  • FHS frequency modulation synchronization
  • the FHS data packet includes the real-time clock of the first Bluetooth device, BD_ADDR, BCH parity bit, and device type information.
  • the identification information of the second Bluetooth device may be pre-stored in the first Bluetooth device, or the identification information of the second Bluetooth device may be obtained before establishing a connection with the second Bluetooth device by other means .
  • the identification information may be the MAC address of the second Bluetooth device, the device name ID of the second Bluetooth device, or other information that can uniquely identify the Bluetooth device.
  • the first Bluetooth device is a car Bluetooth device
  • the second Bluetooth device is a Bluetooth headset. After the Bluetooth headset establishes more than one successful connection with the car Bluetooth device, the identification information of the corresponding Bluetooth headset can be stored in the car Bluetooth device.
  • a slot for accommodating a Bluetooth headset is provided in the on-vehicle Bluetooth device, and the slot has a PIN pin component that can cooperate with the headset jack in the Bluetooth headset.
  • the Bluetooth headset When the Bluetooth headset is placed in the headset When in the slot, data transmission can be performed between the Bluetooth headset and the vehicle-mounted Bluetooth device.
  • the Bluetooth headset can also be used to charge the Bluetooth headset.
  • the identification information of the Bluetooth headset itself is transmitted to the car Bluetooth device through the PIN pin assembly described above, and the car Bluetooth device can obtain the identification information of the Bluetooth headset itself, and then can The identification information performs the above-mentioned paging (PAGE) operation, thereby establishing a connection between the in-vehicle Bluetooth device and the Bluetooth headset.
  • PAGE paging
  • the step of establishing a first Bluetooth connection between the first Bluetooth device and the second Bluetooth device in the slave mode includes:
  • the first Bluetooth device sends an inquiry message
  • the second Bluetooth device enters a query scan state, and sends a query response message when receiving a query message sent from the first Bluetooth device;
  • the first Bluetooth device When receiving the query response message from the second Bluetooth device, the first Bluetooth device establishes a connection with the second Bluetooth device.
  • the first Bluetooth device does not set a specific connection object, but queries which scans to find out which Bluetooth devices can be connected (PAGE) in the vicinity.
  • the extended Bluetooth connection provided in the embodiments of the present application can provide required data between more than two Bluetooth devices
  • the transmission channel and corresponding node control can be applied to more complex application scenarios and provide solutions that are more in line with user needs.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Telephone Function (AREA)

Abstract

本申请涉及一种用于蓝牙设备的扩展连接方法和一种用于蓝牙设备的扩展连接系统，该扩展连接方法包括：对第一蓝牙设备进行初始化，将所述第一蓝牙设备设置为主模式；在所述第一蓝牙设备和第二蓝牙设备之间建立第一蓝牙连接；以及监测是否存在外部蓝牙设备连接至所述第二蓝牙设备，其中在外部蓝牙设备与第二蓝牙设备之间建立第二蓝牙连接的情况下，通过所述第一蓝牙连接和所述第二蓝牙连接在所述第一蓝牙设备和所述外部蓝牙设备之间进行数据传输。本申请实施例中提供的扩展蓝牙连接能够实现在两个以上蓝牙设备之间提供所需要的数据传输通道以及相应的节点控制，从而能够适用于更为复杂的应用场景、并且提供更加符合用户需求的解决方案。

Description

用于蓝牙设备的扩展连接方法和扩展连接系统 技术领域
本申请涉及多个蓝牙设备之间的扩展连接和数据传输领域，特别的，涉及一种用于蓝牙设备的扩展连接方法和一种用于蓝牙设备的扩展连接系统。
背景技术
目前在车辆中，通常会提供具有综合处理能力的车载中控系统，另外由于蓝牙设备在智能终端、便携式装置、可穿戴装置等各种设备中的广泛应用，车载中控系统通常会提供车载蓝牙模块，以便与各种蓝牙设备建立蓝牙连接。车载蓝牙模块与手机的蓝牙模组的实现机制相同，拥有相同的发射系统。一般来说，车载蓝牙是以无线蓝牙技术为基础而设计研发的车内无线通信系统，主要是为了通过蓝牙连接将车载蓝牙模块与手机连接，以便在车辆驾驶的环境中实现通话、音频播放、语音导航等各种应用。
在一些现有技术方案中，为了实现手机与多个蓝牙设备之间的蓝牙连接，通过在手机外接蓝牙接口电路来进行切换连接，例如通过具有两套蓝牙接收电路及切换开关的手机外接蓝牙接口电路来实现手机与蓝牙耳机、手机与车载蓝牙设备之间的通信连接。然而，根据这种技术方案，在同一时刻手机只能够与其中一个蓝牙设备建立连接，并且无法在上述两个蓝牙设备之间实现数据传输。
另外在一些应用场景中，用户不仅需要在两个蓝牙设备之间进行数据传输，基于应用便捷性、隐私保护等方面的考虑，需要使用两个以上的蓝牙设备执行特定的操作，然而现有技术中并没有相应方法来解决上述问题。
公开于本申请背景技术部分的信息仅仅旨在加深对本申请的一般背景技术的理解，而不应当被视为承认或以任何形式暗示该信息构成已为本领域技术人员所公知的现有技术。
发明内容
为了解决上述问题，本申请涉及一种用于蓝牙设备的扩展连接方法，其包括：对第一蓝牙设备进行初始化，将所述第一蓝牙设备设置为主模式；在所述第一蓝牙设备和第二蓝牙设备之间建立第一蓝牙连接；以及监测是否存在外部蓝牙设备连接至所述第二蓝牙设备，其中在外部蓝牙设备与第二蓝牙设备之间建立第二蓝牙连接的情况下，通过所述第一蓝牙连接和所述第二蓝牙连接在所述第一蓝牙设备和所述外部蓝牙设备之间进行数据传输。
可选的，根据本申请实施例的扩展连接方法，其中所述通过所述第一蓝牙连接和所述第二蓝牙连接在所述第一蓝牙设备和所述外部蓝牙设备之间进行数据传输的步骤包括：
通过所述第二蓝牙连接，将数据流从所述外部蓝牙设备传输至所述第二蓝牙设备；
在所述第二蓝牙设备处对所接收的数据流进行处理；以及
通过所述第一蓝牙连接将所述处理后的数据流从所述第二蓝牙设备传输至所述第一蓝牙设备。
可选的，根据本申请实施例的扩展连接方法，其中所述第一蓝牙设备设置为主模式，所述第二蓝牙设备设置为从模式，并且所述外部蓝牙设备设置为主模式。
可选的，根据本申请实施例的扩展连接方法，其中所述第一蓝牙连接为基于SPP协议的透明串口连接，所述第二蓝牙连接为基于A2DP协议的连接。
可选的，根据本申请实施例的扩展连接方法，其中所述第一蓝牙连接和所述第二蓝牙连接均为基于A2DP协议的连接。
可选的，根据本申请实施例的扩展连接方法，其中在所述第二蓝牙设备处对所接收的数据流进行处理的步骤包括：通过所述第二蓝牙设备对所接收的数据流进行数据压缩。
可选的，根据本申请实施例的扩展连接方法，其中通过所述第一蓝牙连接将所述处理后的数据流从所述第二蓝牙设备传输至所述第一蓝牙设备的步骤 包括：
从所述第二蓝牙设备向所述第一蓝牙设备发送握手请求；
确认所述第一蓝牙设备与所述第二蓝牙设备之间握手成功；以及
将经过数据压缩的数据流从所述第二蓝牙设备传输至所述第一蓝牙设备。
可选的，根据本申请实施例的扩展连接方法，其中在所述第一蓝牙设备和处于从模式的第二蓝牙设备之间建立第一蓝牙连接的步骤包括：
所述第一蓝牙设备根据预先存储的第二蓝牙设备的标识信息发送连接请求消息；
所述第二蓝牙设备在接收到所述连接请求消息时发送对应的连接响应消息；以及
所述第一蓝牙设备在接收到来自所述第二蓝牙设备的连接响应消息时，发送调频同步(FHS)数据包。
可选的，根据本申请实施例的扩展连接方法，其中在所述第一蓝牙设备和处于从模式的第二蓝牙设备之间建立第一蓝牙连接的步骤包括：
所述第一蓝牙设备发送查询消息；
所述第二蓝牙设备进入查询扫描状态，并且在接收到从所述第一蓝牙设备发送的查询消息时发送查询响应消息；以及
所述第一蓝牙设备在接收到来自所述第二蓝牙设备的查询响应消息时，与所述第二蓝牙设备建立连接。
根据本申请的另一方面，还提供了一种用于蓝牙设备的扩展连接系统，其包括：第一蓝牙设备，所述第一蓝牙设备设置为主模式；第二蓝牙设备，所述第二蓝牙设备设置为从模式；以及外部蓝牙设备，其中所述外部蓝牙设备设置为主模式，其中在所述第一蓝牙设备和第二蓝牙设备之间具有第一蓝牙连接，在所述外部蓝牙设备与第二蓝牙设备之间具有第二蓝牙连接，其中通过所述第一蓝牙连接和所述第二蓝牙连接在所述第一蓝牙设备和所述外部蓝牙设备之间进行数据传输。
可选的，根据本申请实施例的扩展连接系统，其中所述外部蓝牙设备通过 所述第二蓝牙连接将数据流传输至所述第二蓝牙设备，所述第二蓝牙设备对所接收的数据流进行处理，以及所述第二蓝牙设备通过所述第一蓝牙连接将处理后的数据流传输至所述第一蓝牙设备。
可选的，根据本申请实施例的扩展连接系统，其中所述第一蓝牙连接为基于SPP协议的透明串口连接，所述第二蓝牙连接为基于A2DP协议的连接。
可选的，根据本申请实施例的扩展连接系统，其中所述第二蓝牙设备构造为对所接收的数据流进行数据压缩。
可选的，根据本申请实施例的扩展连接系统，其中所述第二蓝牙设备向所述第一蓝牙设备发送握手请求，在所述第一蓝牙设备与所述第二蓝牙设备之间握手成功，以及所述第二蓝牙设备将经过数据压缩的数据流传输至所述第一蓝牙设备。
可选的，根据本申请实施例的扩展连接系统，其中第一蓝牙设备根据第二蓝牙设备的标识信息发送连接请求消息，第二蓝牙设备在接收到所述连接请求消息时发送对应的连接响应消息，以及第一蓝牙设备在接收到来自第二蓝牙设备的连接响应消息时发送调频同步(FHS)数据包。
可选的，根据本申请实施例的扩展连接系统，其中第二蓝牙设备的标识信息预先存储在所述第一蓝牙设备中。
可选的，根据本申请实施例的扩展连接系统，其中第一蓝牙设备中提供有用于容纳所述第二蓝牙设备的插槽，所述插槽中设置有PIN针组件，所述第二蓝牙设备中提供有与所述PIN针组件配合的插孔，其中所述第一蓝牙设备通过所述PIN针组件获得所述第二蓝牙设备的标识信息。
可选的，根据本申请实施例的扩展连接系统，其中第二蓝牙设备为蓝牙耳机。
可选的，根据本申请实施例的扩展连接系统，其中所述第一蓝牙设备发送查询消息，所述第二蓝牙设备进入查询扫描状态并且在接收到从所述第一蓝牙设备发送的查询消息时发送查询响应消息，以及所述第一蓝牙设备在接收到来自所述第二蓝牙设备的查询响应消息时，与所述第二蓝牙设备建立连接。
根据本申请实施例的又一方面，还提供了一种计算机可读存储介质，所述计算机可读存储介质存储有执行上述扩展连接方法的计算机程序。
与现有技术中的仅在两个蓝牙设备之间建立连接和进行数据传输的构造相比，本申请实施例中提供的扩展蓝牙连接能够实现在两个以上蓝牙设备之间提供所需要的数据传输通道以及相应的节点控制，从而能够适用于更为复杂的应用场景、并且提供更加符合用户需求的解决方案。
附图说明
构成本申请的一部分的附图用来提供对本申请的进一步理解，使得本申请的其它特征、目的和优点变得更明显。本申请的示意性实施例附图及其说明用于解释本申请，并不构成对本申请的不当限定。在附图中：
图1是根据本申请实施例的用于蓝牙设备的扩展连接系统100的示意性框图；
图2是根据本申请实施例的用于蓝牙设备的扩展连接方法的流程图；
图3是根据本申请实施例的在蓝牙耳机与车载蓝牙设备之间通过A2DP连接进行音频数据传输的流程图；
图4是根据本申请实施例的扩展连接系统通过第一蓝牙连接传输音频流数据的示例性流程图；
图5示出了第一蓝牙连接中蓝牙耳机侧的处理例程；
图6示出了第一蓝牙连接中车载蓝牙设备侧的处理例程。
具体实施方式
为了使本技术领域的人员更好地理解本申请方案，下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本申请一部分的实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都应当属于本申请保护的范围。
此外，术语“安装”、“设置”、“设有”、“连接”、“配置为”应做广义理解。例如，可以是固定连接，可拆卸连接，或整体式构造；可以是机械连接，或电连接；可以是直接相连，或者是通过中间媒介间接相连，又或者是两个装置、元件或组成部分之间内部的连通。对于本领域普通技术人员而言，可以根据具体情况理解上述术语在本申请中的具体含义。
需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互组合。下面将参考附图并结合实施例来详细说明本申请。
根据本申请的一个方面提供了一种用于蓝牙设备的扩展连接系统100，如图1所示，该扩展连接系统100包括：第一蓝牙设备10，所述第一蓝牙设备10设置为主模式；第二蓝牙设备20，所述第二蓝牙设备20设置为从模式；以及外部蓝牙设备30，其中所述外部蓝牙设备30设置为主模式，其中在所述第一蓝牙设备10和第二蓝牙设备20之间具有第一蓝牙连接，在所述外部蓝牙设备30与第二蓝牙设备20之间具有第二蓝牙连接，其中通过所述第一蓝牙连接和所述第二蓝牙连接在所述第一蓝牙设备10和所述外部蓝牙设备30之间进行数据传输。
在本申请的一些实施例中，以车载蓝牙设备与蓝牙耳机、具有蓝牙功能的智能手机所构成的蓝牙扩展连接系统为例，该车载蓝牙设备为第一蓝牙设备10的示例，蓝牙耳机为第二蓝牙设备20的示例，上述具有蓝牙功能的智能手机则作为外部蓝牙设备30的示例。
这里的术语“外部蓝牙设备”表示该蓝牙设备是用户使用的任意设备(在此示例中为智能手机)，只要该设备具有通用的蓝牙功能即可。该外部蓝牙设备能够通过普通寻呼连接(PAGE)与处于匹配模式的第二蓝牙设备(此示例中为蓝牙耳机)建立第二蓝牙连接；在上述示例中，即是智能手机可以通过匹配连接(已知对应设备的标识信息)、查询扫描或任意其他适当的方式，与处在通信距离之内的蓝牙耳机建立连接。在此蓝牙连接的基础上，作为第一蓝牙设备的示例的车载蓝牙设备能够额外与蓝牙耳机建立第一蓝牙连接，从而实现了扩展的蓝牙连接。这里的术语“扩展连接”即表示相比常用的双设备之间的蓝牙 连接，根据本申请实施例的技术方案实现了在两个以上的蓝牙设备之间建立蓝牙连接，从而提供了蓝牙链路上的扩展、数据传输方式上的扩展，以及由此产生的针对复杂应用场景的适应度(compliance)上的扩展。
与现有技术中的仅在两个蓝牙设备之间建立连接和进行数据传输的构造相比，本申请实施例中提供的扩展蓝牙连接能够实现在两个以上蓝牙设备之间提供所需要的数据传输通道以及相应的节点控制，从而能够适用于更为复杂的应用场景、并且提供更加符合用户需求的解决方案。
基于本申请的一些实施例，蓝牙耳机可以设置为从模式，其能够与设置为主模式的任意外部蓝牙设备建立连接。在一些应用实例中，该外部蓝牙设备可以是用户的智能手机，现有的智能手机通常可以提供对于A2DP音频传输协议的支持。
A2DP(Advanced Audio Distribution Profile)全称是高级音频分发框架，该协议适用于进行高品质音频数据的传输，具体的是利用在L2CAP层建立起来的ACL异步无连接链路来传输高质量的单声道或者立体声音频数据。基于A2DP协议在智能手机和蓝牙耳机之间建立连接，能够采用耳机内的芯片来堆栈数据，以实现所传输的音频数据的高清晰度呈现。
在上述实施例中，在蓝牙耳机位于车内、用户手持智能手机进入蓝牙耳机的通信范围，或者该蓝牙耳机与智能手机均被用户携带、从而已经建立蓝牙连接的情况下，当用户发动车辆、使得车载系统上电启动后，车载蓝牙设备会通过以下流程额外建立与蓝牙耳机之间的连接。
按照一般的流程，两台蓝牙设备之间的连接是如下进行的。首先，主单元使用GIAC和DIAC查询一定范围内(查询子状态)的蓝牙设备。如果附近的蓝牙设备正在侦听这些查询(查询扫描子状态)，它就会通过发送自己的地址和时钟信息(FHS数据包)给主单元(查询响应子状态)来响应主单元。发送这些信息之后，从单元就开始侦听来自主单元的寻呼消息(寻呼扫描)。主单元在发现范围内的蓝牙设备之后可以寻呼这些设备(寻呼子状态)以建立连接。处于寻呼扫描状态的从单元如果被该主单元寻呼到，则从单元可以立即用自己 的设备访问码(DAC)作为响应(从单元响应子状态)。主单元接收到来自从单元的响应之后即可传送主单元的实时时钟、BD_ADDR、BCH奇偶位以及设备类别(FHS数据包)作为响应。从单元收到该FHS数据包后，主单元和从单元即进入连接状态。
蓝牙设备建立连接的流程中主要涉及如下几种状态：
寻呼(Page)：该子状态被主单元用来激活和连接从单元。主单元通过在不同的跳频信道内传送从单元的设备访问码(DAC)来发出寻呼消息。
寻呼扫描(Page scan)：在该子状态下，从单元在一个窗口扫描存活期内侦听自己的设备访问码(DAC)。在该扫描窗口内从单元以单一跳频侦听(源自其寻呼跳频序列)。
从单元响应(Slave response)：从单元在该子状态下响应其主单元的寻呼消息。如果处于寻呼扫描子状态下的从单元和主单元寻呼消息相关即进入该状态。从单元接收到来自主单元的FHS数据包之后即进入连接状态。
主单元响应(Master response)：主单元在收到从单元对其寻呼消息的响应之后即进到该子状态。如果从单元回复主单元则主单元发送FHS数据包给从单元，然后主单元进入连接状态。
查询(Inquiry)：查询用于发现相邻蓝牙设备的身份。发现单元收集蓝牙设备地址和所有响应查询消息的单元的时钟。
查询扫描(Inquiry scan)：在该状态下，蓝牙设备侦听来自其他设备的查询。此时扫描设备可以侦听一般查询访问码(GIAC)或者专用查询访问码(DIAC)。
查询响应(Inquiry response)：对查询而言，只有从单元才可以响应而主单元则不能。从单元用FHS数据包响应，该数据包包含了从单元的设备访问码、内部时钟和某些其他从单元信息。
一个典型的寻呼过程按照如下步骤进行：
1)一个设备(源)寻呼另外一个设备(目的)，此时处于寻呼状态(Page state)。
2)目的设备接收到该寻呼，此时处于寻呼扫描状态(Page Scan state)。
3)目的设备发送对源设备的回复，此时处于子设备响应状态(Slave Response state)。
4)源设备发送FHS包到目的设备，此时处于主设备响应状态(Master Response state)。
5)目的设备发送第二个回复给源设备，此时处于子设备响应状态(Slave Response state)。
6)目的和源设备切换并采用源信道的参数，此时处于主设备响应状态和子设备响应状态。
在一些实施例中，在第一蓝牙设备(车载蓝牙设备)与第二蓝牙设备(蓝牙耳机)之间建立的第一蓝牙连接为基于SPP协议的透明串口连接，在该第二蓝牙设备(蓝牙耳机)与外部蓝牙设备(智能手机)之间建立的第二蓝牙连接为基于A2DP协议的连接。
在一些实施例中，在使用根据本申请的用于蓝牙设备的扩展连接系统时，例如用户需要通过车载设备端的扬声器来播放手机端的音频，在这种情况下，根据本申请的用于蓝牙设备的扩展连接系统能够根据具体的应用场景要求，适当地提供能够符合用户具体需求的连接模式。
根据一些实施例，针对上述用户需要通过车载设备端的扬声器来播放手机端的音频的情况，本申请的扩展连接系统构造为采用不同的连接协议来分别建立第一蓝牙设备(车载蓝牙设备)与第二蓝牙设备(蓝牙耳机)之间的第一蓝牙连接、以及第二蓝牙设备(蓝牙耳机)与外部蓝牙设备(智能手机)之间的第二蓝牙连接。
由于作为用户任意设备的外部蓝牙设备可以是各种类型的终端设备或固定装置，因此该外部蓝牙设备与蓝牙耳机之间的第二蓝牙连接应当是已知蓝牙设备之间的常规连接方式，这种连接是不受本申请的扩展连接系统影响的蓝牙连接。一般的，该第二蓝牙连接是基于A2DP协议的连接，用于在外部蓝牙设备与蓝牙耳机之间传输高品质音频流。
在这种情况下，如上文所述，以用户的智能手机为例的外部蓝牙设备设置为主模式，在A2DP协议中作为音频流数据的传输源(source)，而蓝牙耳机设置为从模式，在A2DP协议中作为音频流数据的接收方(sink)。
另一方面，由于作为中间节点的蓝牙耳机(第二蓝牙设备)设置为从模式，在该蓝牙耳机与处于主模式的车载蓝牙设备建立的第一蓝牙连接中，无法采用A2DP协议来传输音频流数据：因为此时蓝牙耳机设置为音频流数据的接收方(sink)，而车载蓝牙设备设置为音频流数据的传输源(source)。
针对上述情况，本申请的一些实施例中，使用基于SPP协议的透明串口连接来作为第一蓝牙连接。
图4是根据本申请实施例的扩展连接系统通过第一蓝牙连接传输音频流数据的示例性流程图。
在图4所示流程图的步骤S41，车载蓝牙设备确认其与蓝牙耳机之间的链接(即第一蓝牙连接)是否成功建立。
在确认车载蓝牙设备与蓝牙耳机之间建立了串口连接之后，就可以从蓝牙耳机侧向车载蓝牙设备侧传输此前从外部蓝牙设备接收的音频流数据。
在步骤S42，蓝牙耳机检测是否要输出音频流；
如果检测结果为是，则在步骤S43蓝牙耳机对音频流数据进行压缩；
在步骤S44，蓝牙耳机向车载蓝牙设备发送音频传输握手请求；
在步骤S45，车载蓝牙设备确认是否握手成功，并且在握手成功的情况下发送指示“音频传输已准备好”的消息；
在步骤S46，蓝牙耳机向车载蓝牙设备发送音频数据。
针对上述实施例的情况，图5示出了第一蓝牙连接中蓝牙耳机侧的处理例程，其中包括与车载蓝牙设备侧建立音频传输握手、对从外部蓝牙设备处接收的音频流数据进行压缩处理、以及将压缩处理之后的音频流数据发送至车载蓝牙设备的步骤；图6示出了第一蓝牙连接中车载蓝牙设备侧的处理例程，其中包括从车载蓝牙设备侧与蓝牙耳机侧建立音频传输握手、接收压缩处理之后的音频流数据并且进行解码处理、以及使用车载蓝牙设备侧的扬声器播放音频。
在另一种应用场景中，例如蓝牙耳机的用户不希望将智能手机端的音频送至车载设备来进行扬声器播放，而是将车载设备侧的音频(可以是本地音频、也可以是通过调频广播、或者互联网接收的音频)发送至蓝牙耳机进行播放。当然此应用场景的前提条件是蓝牙耳机被用户佩戴。在这种情况下，前述第一蓝牙设备(车载蓝牙设备)与第二蓝牙设备(蓝牙耳机)之间的第一蓝牙连接、以及第二蓝牙设备(蓝牙耳机)与外部蓝牙设备(智能手机)之间的第二蓝牙连接，可以均为基于A2DP协议的连接。
如图3所示，在步骤S31，车载蓝牙设备设置为A2DP数据传输源(A2DP source)；
在步骤S32，蓝牙耳机检测车载蓝牙设备与蓝牙耳机之间的链接是否成功建立，此时蓝牙耳机设置为A2DP接收方(A2DP sink)；
在步骤S33，车载蓝牙设备检测是否存在要输出的音频流；
在步骤S34，蓝牙耳机接收从车载蓝牙设备传输的音频流数据，并使用蓝牙耳机的内置扬声器进行音乐播放。
显然，与现有技术中的仅在两个蓝牙设备之间建立连接和进行数据传输的构造相比，本申请实施例中提供的扩展蓝牙连接系统能够实现在两个以上蓝牙设备之间提供所需要的数据传输通道以及相应的节点控制，其中扩展/增加的蓝牙链路能够适当的蓝牙协议建立连接，从而能够适用于特定的应用场景，提供符合用户具体需求的数据传输解决方案。
根据本申请的另一方面，还提供了一种用于蓝牙设备的扩展连接方法，如图2所述，该扩展连接方法包括：
S1，对第一蓝牙设备进行初始化，将所述第一蓝牙设备设置为主模式；
S2，在所述第一蓝牙设备和第二蓝牙设备之间建立第一蓝牙连接；以及
S3，监测是否存在外部蓝牙设备连接至所述第二蓝牙设备，其中在外部蓝牙设备与第二蓝牙设备之间建立第二蓝牙连接的情况下，通过所述第一蓝牙连接和所述第二蓝牙连接在所述第一蓝牙设备和所述外部蓝牙设备之间进行数据传输。
在一些实施例中，以车载蓝牙设备为第一蓝牙设备的示例，蓝牙耳机为第二蓝牙设备的示例，具有蓝牙功能的智能手机作为外部蓝牙设备的示例。
根据本申请实施例的扩展连接方法，其中所述通过所述第一蓝牙连接和所述第二蓝牙连接在所述第一蓝牙设备和所述外部蓝牙设备之间进行数据传输的步骤包括：
通过所述第二蓝牙连接，将数据流从所述外部蓝牙设备传输至所述第二蓝牙设备；
在所述第二蓝牙设备处对所接收的数据流进行处理；以及
通过所述第一蓝牙连接将所述处理后的数据流从所述第二蓝牙设备传输至所述第一蓝牙设备。
可选的，根据本申请实施例的扩展连接方法，其中所述第一蓝牙设备设置为主模式，所述第二蓝牙设备设置为从模式，并且所述外部蓝牙设备设置为主模式。
可选的，根据本申请实施例的扩展连接方法，其中所述第一蓝牙连接为基于SPP协议的透明串口连接，所述第二蓝牙连接为基于A2DP协议的连接。
可选的，根据本申请实施例的扩展连接方法，其中所述第一蓝牙连接和所述第二蓝牙连接均为基于A2DP协议的连接。
可选的，根据本申请实施例的扩展连接方法，其中在所述第二蓝牙设备处对所接收的数据流进行处理的步骤包括：通过所述第二蓝牙设备对所接收的数据流进行数据压缩。
可选的，根据本申请实施例的扩展连接方法，其中通过所述第一蓝牙连接将所述处理后的数据流从所述第二蓝牙设备传输至所述第一蓝牙设备的步骤包括：
从所述第二蓝牙设备向所述第一蓝牙设备发送握手请求；
确认所述第一蓝牙设备与所述第二蓝牙设备之间握手成功；以及
将经过数据压缩的数据流从所述第二蓝牙设备传输至所述第一蓝牙设备。
可选的，根据本申请实施例的扩展连接方法，其中在所述第一蓝牙设备和 处于从模式的第二蓝牙设备之间建立第一蓝牙连接的步骤包括：
第一蓝牙设备根据第二蓝牙设备的标识信息发送连接请求消息；
第二蓝牙设备在接收到连接请求消息时发送对应的连接响应消息；以及
第一蓝牙设备在接收到来自第二蓝牙设备的连接响应消息时，发送调频同步(FHS)数据包。
该FHS数据包包括第一蓝牙设备的实时时钟、BD_ADDR、BCH奇偶位以及设备类别的信息。
在根据上述实施例的扩展连接方法中，第一蓝牙设备中可以预先存储第二蓝牙设备的标识信息，或者可以通过其他方式在与第二蓝牙设备建立连接之前获得该第二蓝牙设备的标识信息。该标识信息可以是第二蓝牙设备的MAC地址、第二蓝牙设备的设备名称ID、或者其他能够将该蓝牙设备唯一标识的信息。
在一些实施例中，上述第一蓝牙设备为车载蓝牙设备，第二蓝牙设备为蓝牙耳机。当蓝牙耳机与车载蓝牙设备建立超过1次成功连接之后，可以在车载蓝牙设备中存储对应蓝牙耳机的标识信息。
在另一些实施例中，车载蓝牙设备中提供了用于容纳蓝牙耳机的插槽，该插槽中具有PIN针组件，能够与蓝牙耳机中的耳机插孔彼此配合，当蓝牙耳机置于耳机插槽中时，能够在蓝牙耳机与车载蓝牙设备之间进行数据传输。可选的，通过上述PIN针组件还能够对蓝牙耳机进行充电。
在一些实施例中，当蓝牙耳机置于耳机插槽中时，蓝牙耳机自身的标识信息通过上述PIN针组件传输至车载蓝牙设备，车载蓝牙设备能够获得蓝牙耳机自身的标识信息，进而能够根据该标识信息进行上述寻呼(PAGE)操作，从而在车载蓝牙设备与蓝牙耳机之间建立连接。
可选的，根据本申请实施例的扩展连接方法，其中在所述第一蓝牙设备和处于从模式的第二蓝牙设备之间建立第一蓝牙连接的步骤包括：
所述第一蓝牙设备发送查询消息；
所述第二蓝牙设备进入查询扫描状态，并且在接收到从所述第一蓝牙设备 发送的查询消息时发送查询响应消息；以及
所述第一蓝牙设备在接收到来自所述第二蓝牙设备的查询响应消息时，与所述第二蓝牙设备建立连接。
在根据上述实施例的扩展连接方法中，第一蓝牙设备没有设定特定的连接对象，而是通过查询扫描来获知周边存在哪些可以被连接(PAGE)的蓝牙设备。
以上所述仅为本申请的优选实施例而已，并不用于限制本申请，对于本领域的技术人员来说，本申请可以有各种更改和变化。凡在本申请的精神和原则之内，所作的任何修改、等同替换、改进等，均包含在本申请的保护范围之内。
工业实用性
与现有技术中的仅在两个蓝牙设备之间建立连接和进行数据传输的构造相比，本申请实施例中提供的扩展蓝牙连接能够实现在两个以上蓝牙设备之间提供所需要的数据传输通道以及相应的节点控制，从而能够适用于更为复杂的应用场景、并且提供更加符合用户需求的解决方案。

Claims (20)

  1. 一种用于蓝牙设备的扩展连接方法，其特征在于，包括：
    对第一蓝牙设备进行初始化，将所述第一蓝牙设备设置为主模式；
    在所述第一蓝牙设备和第二蓝牙设备之间建立第一蓝牙连接；以及
    监测是否存在外部蓝牙设备连接至所述第二蓝牙设备，其中，在外部蓝牙设备与第二蓝牙设备之间建立第二蓝牙连接的情况下，通过所述第一蓝牙连接和所述第二蓝牙连接在所述第一蓝牙设备和所述外部蓝牙设备之间进行数据传输。
  2. 根据权利要求1所述的扩展连接方法，其特征在于，所述通过所述第一蓝牙连接和所述第二蓝牙连接在所述第一蓝牙设备和所述外部蓝牙设备之间进行数据传输的步骤包括：
    通过所述第二蓝牙连接，将数据流从所述外部蓝牙设备传输至所述第二蓝牙设备；
    在所述第二蓝牙设备处对所接收的数据流进行处理；以及
    通过所述第一蓝牙连接将所述处理后的数据流从所述第二蓝牙设备传输至所述第一蓝牙设备。
  3. 根据权利要求1所述的扩展连接方法，其特征在于，所述第一蓝牙设备设置为主模式，所述第二蓝牙设备设置为从模式，并且所述外部蓝牙设备设置为主模式。
  4. 根据权利要求2所述的扩展连接方法，其特征在于：所述第一蓝牙连接为基于SPP协议的透明串口连接，所述第二蓝牙连接为基于A2DP协议的连接。
  5. 根据权利要求2所述的扩展连接方法，其特征在于：所述第一蓝牙连 接和所述第二蓝牙连接均为基于A2DP协议的连接。
  6. 根据权利要求3所述的扩展连接方法，其特征在于，在所述第二蓝牙设备处对所接收的数据流进行处理的步骤包括：
    通过所述第二蓝牙设备对所接收的数据流进行数据压缩。
  7. 根据权利要求6所述的扩展连接方法，其特征在于，通过所述第一蓝牙连接将所述处理后的数据流从所述第二蓝牙设备传输至所述第一蓝牙设备的步骤包括：
    从所述第二蓝牙设备向所述第一蓝牙设备发送握手请求；
    确认所述第一蓝牙设备与所述第二蓝牙设备之间握手成功；以及
    将经过数据压缩的数据流从所述第二蓝牙设备传输至所述第一蓝牙设备。
  8. 根据权利要求1所述的扩展连接方法，其特征在于，在所述第一蓝牙设备和处于从模式的第二蓝牙设备之间建立第一蓝牙连接的步骤包括：
    所述第一蓝牙设备根据预先存储的第二蓝牙设备的标识信息发送连接请求消息；
    所述第二蓝牙设备在接收到所述连接请求消息时发送对应的连接响应消息；以及
    所述第一蓝牙设备在接收到来自所述第二蓝牙设备的连接响应消息时，发送调频同步(FHS)数据包。
  9. 根据权利要求1所述的扩展连接方法，其特征在于，在所述第一蓝牙设备和处于从模式的第二蓝牙设备之间建立第一蓝牙连接的步骤包括：
    所述第一蓝牙设备发送查询消息；
    所述第二蓝牙设备进入查询扫描状态，并且在接收到从所述第一蓝牙设备发送的查询消息时发送查询响应消息；以及
    所述第一蓝牙设备在接收到来自所述第二蓝牙设备的查询响应消息时，与所述第二蓝牙设备建立连接。
  10. 一种用于蓝牙设备的扩展连接系统，其特征在于，包括：
    第一蓝牙设备，所述第一蓝牙设备设置为主模式；
    第二蓝牙设备，所述第二蓝牙设备设置为从模式；以及
    外部蓝牙设备，其中所述外部蓝牙设备设置为主模式，
    其中在所述第一蓝牙设备和第二蓝牙设备之间具有第一蓝牙连接，在所述外部蓝牙设备与第二蓝牙设备之间具有第二蓝牙连接，其中，通过所述第一蓝牙连接和所述第二蓝牙连接在所述第一蓝牙设备和所述外部蓝牙设备之间进行数据传输。
  11. 根据权利要求10所述的扩展连接系统，其特征在于，所述外部蓝牙设备通过所述第二蓝牙连接将数据流传输至所述第二蓝牙设备，所述第二蓝牙设备对所接收的数据流进行处理，以及所述第二蓝牙设备通过所述第一蓝牙连接将处理后的数据流传输至所述第一蓝牙设备。
  12. 根据权利要求10所述的扩展连接系统，其特征在于，所述第一蓝牙连接为基于SPP协议的透明串口连接，所述第二蓝牙连接为基于A2DP协议的连接。
  13. 根据权利要求11所述的扩展连接系统，其特征在于，所述第二蓝牙设备构造为对所接收的数据流进行数据压缩。
  14. 根据权利要求13所述的扩展连接系统，其特征在于，所述第二蓝牙设备向所述第一蓝牙设备发送握手请求，在所述第一蓝牙设备与所述第二蓝牙设备之间握手成功，以及所述第二蓝牙设备将经过数据压缩的数据流传输至所 述第一蓝牙设备。
  15. 根据权利要求10所述的扩展连接系统，其特征在于，所述第一蓝牙设备根据第二蓝牙设备的标识信息发送连接请求消息，所述第二蓝牙设备在接收到所述连接请求消息时发送对应的连接响应消息，以及所述第一蓝牙设备在接收到来自所述第二蓝牙设备的连接响应消息时发送调频同步(FHS)数据包。
  16. 根据权利要求15所述的扩展连接系统，其特征在于，所述第二蓝牙设备的标识信息预先存储在所述第一蓝牙设备中。
  17. 根据权利要求15所述的扩展连接系统，其特征在于，所述第一蓝牙设备中提供有用于容纳所述第二蓝牙设备的插槽，所述插槽中设置有PIN针组件，所述第二蓝牙设备中提供有与所述PIN针组件配合的插孔，其中所述第一蓝牙设备通过所述PIN针组件获得所述第二蓝牙设备的标识信息。
  18. 根据权利要求10所述的扩展连接系统，其特征在于，所述第一蓝牙设备发送查询消息，所述第二蓝牙设备进入查询扫描状态并且在接收到从所述第一蓝牙设备发送的查询消息时发送查询响应消息，以及所述第一蓝牙设备在接收到来自所述第二蓝牙设备的查询响应消息时，与所述第二蓝牙设备建立连接。
  19. 根据权利要求10所述的扩展连接系统，其特征在于，所述第二蓝牙设备为蓝牙耳机。
  20. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质存储有执行权利要求1至9任意一项的方法的计算机程序。
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