WO2021208358A1 - 蓝牙tws设备间的数据传输方法及其蓝牙tws设备 - Google Patents

蓝牙tws设备间的数据传输方法及其蓝牙tws设备 Download PDF

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Publication number
WO2021208358A1
WO2021208358A1 PCT/CN2020/117084 CN2020117084W WO2021208358A1 WO 2021208358 A1 WO2021208358 A1 WO 2021208358A1 CN 2020117084 W CN2020117084 W CN 2020117084W WO 2021208358 A1 WO2021208358 A1 WO 2021208358A1
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Prior art keywords
bluetooth
data
auxiliary frame
data transmission
tws
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PCT/CN2020/117084
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English (en)
French (fr)
Inventor
陈金宏
Original Assignee
炬力(珠海)微电子有限公司
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Application filed by 炬力(珠海)微电子有限公司 filed Critical 炬力(珠海)微电子有限公司
Priority to EP20908459.9A priority Critical patent/EP3923608B1/en
Priority to US17/420,680 priority patent/US20220264672A1/en
Publication of WO2021208358A1 publication Critical patent/WO2021208358A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W76/00Connection management
    • H04W76/10Connection setup
    • H04W76/14Direct-mode setup
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053Allocation of signaling, i.e. of overhead other than pilot signals
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00Details of transducers, loudspeakers or microphones
    • H04R1/10Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1041Mechanical or electronic switches, or control elements
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0011Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0016Hand-off preparation specially adapted for end-to-end data sessions
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0083Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/0085Hand-off measurements
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/24Reselection being triggered by specific parameters
    • H04W36/30Reselection being triggered by specific parameters by measured or perceived connection quality data
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W4/00Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/80Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2420/00Details of connection covered by H04R, not provided for in its groups
    • H04R2420/07Applications of wireless loudspeakers or wireless microphones
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2460/00Details of hearing devices, i.e. of ear- or headphones covered by H04R1/10 or H04R5/033 but not provided for in any of their subgroups, or of hearing aids covered by H04R25/00 but not provided for in any of its subgroups
    • H04R2460/03Aspects of the reduction of energy consumption in hearing devices
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02Power saving arrangements
    • H04W52/0209Power saving arrangements in terminal devices
    • H04W52/0225Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal

Definitions

  • the wireless communication technology of this application specifically relates to a data transmission method between Bluetooth TWS devices, which is a Bluetooth TWS device.
  • TWS Truste Wireless Stereo
  • TWS technology is based on the development of Bluetooth chip technology. According to its working principle, it means that the mobile phone is connected to the main earphone, and then the main earphone is quickly connected to the auxiliary earphone in a wireless manner, so as to realize the true wireless separation of the left and right channels of Bluetooth. When the slave speaker is not connected, the main speaker returns to mono sound quality.
  • TWS technology has been applied to the field of bluetooth headsets, so a new product TWS bluetooth headset was born.
  • the mainstream TWS equipment on the market is realized by forwarding. That is, the mobile phone sends the audio data to the first device, and then the first device forwards the received audio data to the second device.
  • This method causes the power consumption of the first device to be large, and all audio data is forwarded in the air, which wastes Bluetooth bandwidth, reduces the performance of the TWS device, and increases the delay of audio output.
  • a data transmission method between Bluetooth TWS devices includes:
  • the first device establishes a real connection with the Bluetooth device, and the second device establishes a virtual connection with the Bluetooth device;
  • the first device After the first device and the second device receive the data packet of the Bluetooth device at the Bluetooth link time N, the first device switches to the state of receiving the first auxiliary frame;
  • the first device sends a second auxiliary frame to the second device at the Bluetooth link time N+1.
  • the method further includes:
  • the second device switches to the state of sending the first auxiliary frame
  • the second device After the second device sends the first auxiliary frame to the first device, it switches to a state of receiving a second auxiliary frame.
  • the first auxiliary frame includes the following commands: at least one of requesting a forwarding flag, segment check information, requesting communication with a Bluetooth device, and requesting data transmission;
  • the second auxiliary frame includes the following commands: at least one of a communication switching command, a request forwarding flag, segment verification information, and acceptance of communication information with a Bluetooth device.
  • the method further includes: when the second device establishes a virtual connection with the Bluetooth device and the second device does not correctly receive the data packet sent by the Bluetooth device, the first auxiliary frame includes Request forwarding flag.
  • the method further includes: when the first device receives the request forwarding flag, if the first device does not correctly receive the data of the Bluetooth device, the first device gives the The Bluetooth device replies with a NAK signal, requesting the Bluetooth device to resend data;
  • the first device When the first device receives the forwarding request flag, if the first device has correctly received the data of the Bluetooth device, and the first device decides not to forward the data to the second device, then The first device replies a NAK signal to the Bluetooth device, requesting the Bluetooth device to resend data;
  • the first device When the first device receives the forwarding request flag, if the first device has correctly received the data of the Bluetooth device, and the first device decides to forward the data to the second device, it will be sent to the Bluetooth device.
  • the device replies with an ACK signal or a NAK signal and forwards the data to the second device.
  • the method further includes:
  • the first device forwards data to the second device or the second device forwards data to the first device;
  • the first device does not forward data to the second device or the second device does not forward data to the first device.
  • the method further includes:
  • the first auxiliary frame includes the second device receiving the data
  • the Bluetooth device sends data segment verification information, and the first device compares the segment verification information with the verification information generated by the data of the Bluetooth device completely received to confirm the second device Error data segment;
  • the second auxiliary frame includes the first device to receive the data
  • the Bluetooth device sends data segment verification information, and the second device compares the segment verification information with the verification information generated by the data of the Bluetooth device completely received to confirm the first device The data segment in error.
  • the method further includes:
  • the first device forwards the erroneous data segment to the second device or the second device forwards the erroneous data segment to the first device.
  • the method further includes:
  • the first auxiliary frame contains a command requesting communication with the Bluetooth device, and the first device decides whether to accept the command according to the current situation. If so, the The second auxiliary frame sent by the first device to the second device includes a command for accepting communication information with a Bluetooth device.
  • the method further includes:
  • the command to accept communication information with the Bluetooth device includes a one-bit acceptance flag and two-bit flow control information, and the flow control information includes a response flag ARQN and a data sequence number SEQN for establishing a real connection with the Bluetooth device.
  • the method further includes:
  • the second device waits to receive the first auxiliary frame sent by the first device. If it is received, it indicates that the second device successfully switches the virtual connection to the real link. The second device establishes a real connection with the Bluetooth device;
  • the first device waits to receive the second auxiliary frame sent by the second device. If received, it indicates that the first device successfully switches the real link to the virtual link Way, the first device establishes a virtual connection with the Bluetooth device.
  • the method further includes:
  • the first auxiliary frame includes a request data transmission command, and the first device decides whether to send the second auxiliary frame according to the current link situation, If so, the second auxiliary frame sent by the first device to the second device includes a communication switching command.
  • the method further includes:
  • the second auxiliary frame includes a forwarding request flag.
  • the method further includes:
  • the first device confirms whether the second device has correctly received the data packet through the first auxiliary frame.
  • the method further includes:
  • the first device decides whether to send the second auxiliary frame according to the current link situation. If so, the first device sends the The second auxiliary frame sent by the second device includes a communication switching command.
  • the establishment of the virtual connection between the second device and the Bluetooth device includes:
  • the second device establishes a connection with the first device to obtain parameters for establishing a connection with the Bluetooth device.
  • establishing a connection between the second device and the first device to obtain parameters for establishing a connection with the Bluetooth device further includes:
  • the first device establishes a Bluetooth communication connection with the second device, and the first device transmits the parameter to the second device;
  • the first device broadcasts the parameters, and the second device collects the parameters through scanning; or
  • the second device obtains the parameter from the first device through OOB communication; or
  • the first device sends the parameter to a third device, and the second device obtains the parameter from the third device.
  • the purpose of the embodiments of the present invention is to provide a Bluetooth TWS device for reducing the power consumption of the first device.
  • the embodiment of the present invention is implemented in this way, a Bluetooth TWS device, including a first device and a second device;
  • the first device is used to establish a real connection with a Bluetooth device, and after receiving a data packet from the Bluetooth device at the Bluetooth link time N, switch to receiving the first auxiliary frame state; and is used for the Bluetooth link time N+1 , Sending a second auxiliary frame to the second device;
  • the second device is configured to establish a virtual connection with a Bluetooth device, and switch to the state of sending the first auxiliary frame after receiving the data packet of the Bluetooth device at the Bluetooth link time N, and send the first auxiliary frame to the first device. After the auxiliary frame, switch to the state of receiving the second auxiliary frame.
  • the embodiment of the present invention has the following effect: the first device establishes a wireless connection with the Bluetooth device, and the second device learns some related parameters of the wireless link from the first device in a direct or indirect manner, The second device establishes a virtual connection with the Bluetooth device according to the obtained parameters.
  • the first device and the second device implement the establishment of a TWS link through the technical features of the first auxiliary frame and the second auxiliary frame, so as to perform data forwarding, data response or other data requests between TWS devices.
  • the virtual connection can receive the data sent by the Bluetooth device to the first device, and can also be converted into a real connection through the established TWS link when needed, and send data to the Bluetooth device.
  • the first device and the second device simultaneously receive data from the Bluetooth device and perform true Bluetooth transmission, which greatly saves the power consumption of the first device, saves Bluetooth bandwidth, reduces data flow delay, and improves the performance of the TWS device.
  • the TWS device does not accurately receive the data, the data is forwarded between the two, or the wrong data is forwarded, so as to save the Bluetooth bandwidth and the communication efficiency between the TWS devices.
  • Figure 1 shows a flow chart of a method for data transmission between Bluetooth TWS devices provided by this application
  • FIG. 2 shows a flow chart of another method for data transmission between Bluetooth TWS devices provided by this application
  • FIG. 3 shows a schematic diagram of a sequence of a Bluetooth device and a TWS device provided by the present application
  • FIG. 4 shows a sequence diagram of converting the second device provided by the present application from a virtual connection to a real connection
  • Figure 5 shows a schematic diagram of the connection between the Bluetooth TWS device and the Bluetooth device provided by the present application.
  • a data transmission method between Bluetooth TWS devices includes the following steps:
  • S101 The first device establishes a real connection with the Bluetooth device, and the second device establishes a virtual connection with the Bluetooth device;
  • S103 The first device sends a second auxiliary frame to the second device at the Bluetooth link time N+1.
  • Establishing the virtual connection between the second device and the Bluetooth device includes: establishing a connection between the second device and the first device to obtain parameters for establishing a connection with the Bluetooth device.
  • the first device establishes a wireless connection with the Bluetooth device
  • the second device learns some relevant parameters of the wireless link from the first device in a direct or indirect manner to establish a virtual connection with the Bluetooth device .
  • the second device establishes a virtual connection with the Bluetooth device according to the obtained parameters.
  • the virtual connection can receive the data sent by the Bluetooth device to the first device, and can also be converted to a real connection when needed, and send data to the Bluetooth device.
  • the first device and the Bluetooth device establish a standard Bluetooth ACL link, which is a real connection.
  • the second device may establish a connection with the first device to obtain parameters for establishing a connection with the Bluetooth device in the following manner: the first device establishes a Bluetooth communication connection with the second device, and the first device Transmit the parameters to the second device; or the first device broadcasts the parameters, and the second device collects the parameters through scanning; or the second device receives the parameters from the second device through OOB communication A device obtains the parameter; or the first device sends the parameter to a third device, and the second device obtains the parameter from the third device.
  • the second device establishes a virtual connection according to the obtained parameters, and can receive the data sent by the Bluetooth device to the first device.
  • a data transmission method between Bluetooth TWS devices includes the following steps:
  • S201 The first device establishes a real connection with the Bluetooth device, and the second device establishes a virtual connection with the Bluetooth device.
  • S203 The second device switches to a state of sending a first auxiliary frame; the second device switches to a state of receiving a second auxiliary frame after sending the first auxiliary frame to the first device.
  • S204 The first device sends a second auxiliary frame to the second device at the Bluetooth link time N+1.
  • the process of the above-mentioned embodiment will be described in detail below with reference to FIG. 3.
  • the first device establishes a real connection with the Bluetooth device, and the second device establishes a virtual connection with the Bluetooth device.
  • the first device and the second device establish a virtual connection
  • the first device switches to the state of receiving the first auxiliary frame, and the first device sends the second auxiliary frame to the second device at the Bluetooth link time N+1.
  • the second device switches to the state of sending the first auxiliary frame.
  • the first device If the first device has correctly received the data of the Bluetooth device, when the second device has not correctly received the data of the Bluetooth device, it will send a forwarding request to the first device through the first auxiliary frame. After receiving the forwarding request, the first device sends NAK information to the Bluetooth device at the Bluetooth link time N+1. Of course, the first device may not give a response.
  • the second device sends a request data forwarding request. After sending the first auxiliary frame, the second device enters the state of receiving the second auxiliary frame. After the first device sends the NAK information to the Bluetooth device, if it is determined to forward the data to the second device, it sends a communication switching command to the second device through the second auxiliary frame.
  • the first device and the second device switch to TWS communication to perform data forwarding. If the first device analyzes that it does not need to be forwarded to the second device, it enters the Bluetooth link time N+2 and waits to receive the next data from the Bluetooth device. After receiving the second auxiliary frame timeout, the second device also enters the Bluetooth link time N+2, waiting to receive the next data from the Bluetooth device. Since the first device previously sent NAK information to the Bluetooth device, the Bluetooth device will subsequently retransmit the data. If the second device has correctly received the data of the Bluetooth device, the first auxiliary frame sent to the first device does not include a forwarding request.
  • the first device After receiving a first auxiliary frame that does not include the request data forwarding request, the first device sends an ACK message to the Bluetooth device at the Bluetooth link time N+1. When the first device does not correctly receive the data of the Bluetooth device at the Bluetooth link time N, it sends NAK information to the Bluetooth device at the Bluetooth link time N+1. At the same time, if the first auxiliary frame received by the first device does not include the forwarding request, the second auxiliary frame may be used to send the forwarding request and the communication switching command to the second device when needed.
  • the present invention provides a preferred embodiment.
  • the forwarding of the first device or the second device can only be performed at an appropriate time. It is necessary to determine whether the communication quality of the current TWS link is better than the communication quality between the TWS device and the Bluetooth device. It is detected that the communication quality between the first device and the second device is good, and the communication quality between at least one of the first device or the second device and the Bluetooth device is poor, and the TWS device forwarding function is activated.
  • the second device forwards data or the second device forwards data to the first device; if not, the first device does not forward data to the second device or the second device does not forward data to the first device A device forwards data.
  • the communication quality between the second device and the Bluetooth device is judged; if the second device forwards to the first device, then the communication quality between the first device and the Bluetooth device is judged. As long as the communication quality of one of the first device or the second device with the Bluetooth device is worse than the communication quality of the TWS link, the forwarding is performed.
  • the present invention provides a preferred embodiment.
  • the first auxiliary frame or the second auxiliary frame sent between the first device and the second device is mainly used to maintain the virtual link established between the second device and the Bluetooth device , It also assists the communication between TWS devices.
  • the first auxiliary frame includes the following commands: request forwarding flag, segment check information, request to communicate with the Bluetooth device, and request data transmission at least one;
  • the second auxiliary frame includes the following commands: communication switching command, request forwarding flag, segment At least one of verifying information and accepting communication information with the Bluetooth device.
  • the second device may send the forwarding request flag in the first auxiliary frame.
  • the first auxiliary frame may contain the segment verification information of the data sent by the Bluetooth device received by the second device.
  • the first auxiliary frame may contain the "request to communicate with the Bluetooth device" sign.
  • the second device When the second device expects to communicate directly with the Bluetooth device, for example, it needs to send data directly to the Bluetooth device, the second device will send the first auxiliary frame to the first The device sends a request to communicate information with the Bluetooth device, and the first device determines whether to accept the request, and gives a response by sending a second auxiliary frame.
  • the first auxiliary frame may contain the TWS device "request for data transmission" information.
  • the second device When the second device has additional data that needs to be sent to the first device, it will add the "data sending request” message to the first auxiliary frame.
  • the present invention provides a preferred embodiment. After receiving the "request data transmission" command, the first device decides whether to send a second auxiliary frame for communication switching and receives additional data from the second device according to the current link situation.
  • the first auxiliary frame includes a request data transmission command, and the first device decides whether to send the second auxiliary frame according to the current link situation, If so, the second auxiliary frame sent by the first device to the second device includes a communication switching command.
  • the extra data here generally refers to the upper-layer user data, mainly the synchronization of various information between TWS devices, such as fine-tuning the playback speed, keeping the two master and slave devices playing audio data at the same time, such as synchronizing button information, synchronizing battery information, Synchronization prompts, synchronization working status, etc., can also include underlying link control data, such as frequency hopping sequence, power control, or no data, such as empty packets, just to synchronize the timing of the TWS device.
  • link control data such as frequency hopping sequence, power control, or no data, such as empty packets, just to synchronize the timing of the TWS device.
  • the first auxiliary frame includes a request Forward logo.
  • the first device receives the request forwarding flag, if the first device does not correctly receive the data of the Bluetooth device, the first device replies to the Bluetooth device with a NAK signal, requesting the The Bluetooth device retransmits the data; when the first device receives the request forwarding flag, if the first device has correctly received the data of the Bluetooth device, and the first device decides not to send the data to the first device
  • the second device forwards the first device replies to the Bluetooth device with a NAK signal, requesting the Bluetooth device to resend the data; when the first device receives the forwarding request flag, if the first device When the data of the Bluetooth device has been correctly received, and the first device decides to forward the data to the second device, it returns an ACK signal or a NAK signal to the Bluetooth device and then forwards the data to the
  • the Bluetooth device when the Bluetooth device sends a packet of data to the first device at the time N of the Bluetooth link, the second device also receives the data packet at the time N of the Bluetooth link. After the first device and the second device finish receiving the data packet sent by the Bluetooth device, the first device switches to the state of receiving the first auxiliary frame, and the second device switches to the state of sending the first auxiliary frame.
  • the first device correctly receives the data of the Bluetooth device and receives the forwarding request of the second device from the information in the first auxiliary frame, it can optionally send NAK information to the Bluetooth device at the Bluetooth link time N+1.
  • the second device sends a request data forwarding request.
  • the second auxiliary frame is sent to the second device.
  • the second device After receiving the second auxiliary frame, the second device enters a waiting state, and the first device enters a forwarding state.
  • the first device does not correctly receive the data of the Bluetooth device, and it is known from the information in the first auxiliary frame that the second device does not send a forwarding request, it can optionally send it to the Bluetooth device at the time of the Bluetooth link N+1 NAK information.
  • the second auxiliary frame is sent to the second device. The second device enters the state of waiting to receive the second auxiliary frame after sending the first auxiliary frame.
  • the second device enters the forwarding state, and forwards the data packet received from the Bluetooth device to the first device. If the second device has correctly received the data of the Bluetooth device, the first auxiliary frame sent to the first device does not include a forwarding request. If the first device has also correctly received the data of the Bluetooth device, it will send an ACK message to the Bluetooth device at the Bluetooth link time N+1.
  • the present invention provides a preferred embodiment.
  • the second auxiliary frame includes a forwarding request flag . And further confirm through the first auxiliary frame whether the second device has correctly received the data packet. If the first auxiliary frame contains the information of the forwarding request flag, this information can be represented by one bit, for example, 1 means forwarding is requested, and 0 means forwarding is not requested. At this time, as long as the first device does not receive the first auxiliary frame, or the forwarding request flag in the received first auxiliary frame is 1, it means that the second device has not received the data packet correctly.
  • the request forwarding flag is 0, it means that the second device has correctly received the data packet, or another method is used. If the first auxiliary frame contains segmentation check information, then when the first device receives the first When the auxiliary frame, and the segment check information in the first auxiliary is consistent with the segment check information calculated by the first device according to the received data packet, it indicates that the second device has correctly received the data packet.
  • the first device sends the forwarding request flag when it feels that the second device needs to forward data according to the link situation. The solution is exactly the same as the solution for including the forwarding request flag in the first auxiliary frame.
  • the present invention provides a preferred embodiment.
  • the first device forwards the erroneous data segment to the second device or the second device forwards the erroneous data segment to the first device.
  • the first auxiliary frame includes the second device receiving the data
  • the Bluetooth device sends data segment verification information, and the first device compares the segment verification information with the verification information generated by the data of the Bluetooth device completely received to confirm the second device The data segment in error.
  • the second auxiliary frame includes the first device to receive the data
  • the Bluetooth device sends data segment verification information, and the second device compares the segment verification information with the verification information generated by the data of the Bluetooth device completely received to confirm the first device The data segment in error.
  • the second device can learn which segment data of the first device has errors through this information, and only forward the data of the error segment.
  • the first auxiliary frame may contain the segment verification information of the data sent by the Bluetooth device received by the second device.
  • the present invention provides a preferred embodiment.
  • the first auxiliary frame contains a command to request communication with the Bluetooth device, and the first device decides whether to communicate with the Bluetooth device according to the current situation.
  • the command is accepted. If yes, the second auxiliary frame sent by the first device to the second device includes a command to accept communication information with a Bluetooth device.
  • the command to accept communication information with the Bluetooth device includes a one-bit acceptance flag and two-bit flow control information, and the flow control information includes a response flag ARQN and a data sequence number for establishing a real connection with the Bluetooth device. SEQN.
  • the second device waits to receive the first auxiliary frame sent by the first device.
  • the second device If it is received, it indicates that the second device successfully switches the virtual connection to the real link.
  • the second device establishes a real connection with the Bluetooth device; at the Bluetooth link time N+3, the first device waits to receive the second auxiliary frame sent by the second device, and if received, it indicates The first device successfully switches the real link to the virtual link, and the first device establishes a virtual connection with the Bluetooth device.
  • the second device when the second device expects to directly communicate with the Bluetooth device, for example, it needs to directly send data to the Bluetooth device.
  • the second device will send a request to the first device to communicate information with the Bluetooth device through the first auxiliary frame.
  • the first device judges whether to accept the request, and responds by sending a second auxiliary frame.
  • the second auxiliary frame may contain "accept the communication information with the Bluetooth device". If the first device accepts the second device's request to communicate with the Bluetooth device in the first auxiliary frame, the first device sends "acceptance of communication with the Bluetooth device" in the second auxiliary frame.
  • the "acceptance of communication information with a Bluetooth device" is mainly a one-bit acceptance flag and two-bit flow control information.
  • the second device knows what the response flag ARQN and the data sequence number SEQN should be sent to the Bluetooth device.
  • the first device may reject the request of the second device because a data packet that needs to be answered is currently being sent to the Bluetooth device.
  • the first device may also reject the request of the second device because some key processes are in progress (for example, the Bluetooth device is updating the encryption key, etc.).
  • the order of the content contained in the second auxiliary frame in the above table can be adjusted arbitrarily, and the second auxiliary frame contains at least one item of content.
  • the process of converting the above-mentioned second device into a real connection will be described in detail below in conjunction with FIG. 4.
  • the second device expects to communicate directly with the Bluetooth device, and the second device sends the "request to communicate with the Bluetooth device" flag in the first auxiliary frame at the time N of the Bluetooth link to the first device.
  • the first device determines that it can accept the request of the other party, and then sends the "accepting communication information with the Bluetooth device" to the second device in the second auxiliary frame at the time N+1 of the Bluetooth link. Then the first device switches to the second device at the Bluetooth link time N+2, and sends the first auxiliary frame to the second device.
  • the second device After the second device receives the "accept communication information with the Bluetooth device" from the first device at the Bluetooth link time N+1, it switches to the first device at the Bluetooth link time N+2, and waits to receive the first aid from the first device frame. If the second device receives the first auxiliary frame at the Bluetooth link time N+2, it means that the second device has successfully switched the virtual connection to the real link. In the subsequent Bluetooth link time N+3, the second device needs to send a second auxiliary frame to the first device. The first device receives the second auxiliary frame at the Bluetooth link time N+3, which means that the first device has switched to the virtual connection.
  • the first device will start a timeout after sending the "accept the communication information with the Bluetooth device", and the second auxiliary frame needs to be received before the timeout to indicate that the handover is successful. Otherwise, after the timeout, it will be restored to the first device.
  • the second device After the second device receives the "accept the communication information with the Bluetooth device", it will start a timeout, and the first auxiliary frame needs to be received before the timeout to indicate that the handover is successful. Otherwise, after the timeout, it will be restored to the second device. It can be seen that after the conversion is completed, the second device becomes the aforementioned first device, and the first device becomes the aforementioned second device. And, the connection of the second device becomes a real connection, and the connection of the first device becomes a virtual connection.
  • FIG. 5 shows a schematic diagram of the connection between the Bluetooth TWS device and the Bluetooth device provided by the present application.
  • An embodiment of the present invention provides a Bluetooth TWS device based on the above embodiment, including a first device and a second device;
  • the first device is used to establish a real connection with a Bluetooth device, and after receiving a data packet from the Bluetooth device at the Bluetooth link time N, switch to receiving the first auxiliary frame state; and is used for the Bluetooth link time N+1 , Sending a second auxiliary frame to the second device;
  • the second device is configured to establish a virtual connection with a Bluetooth device, and switch to the state of sending the first auxiliary frame after receiving the data packet of the Bluetooth device at the Bluetooth link time N, and send the first auxiliary frame to the first device. After the auxiliary frame, switch to the state of receiving the second auxiliary frame.
  • the first device and the Bluetooth device establish a wireless connection, and the second device learns some relevant parameters of the wireless link from the first device in a direct or indirect manner.
  • the second device establishes a virtual connection with the Bluetooth device according to the obtained parameters.
  • the virtual connection can receive the data sent by the Bluetooth device to the first device, and with the help of the first auxiliary frame, the virtual connection can be turned into a real connection, and the data can be sent to the Bluetooth device. Therefore, whether it is the first device or the second device in the embodiment of the present invention, it is only described from the perspective of the master-slave device implemented in the data transmission process. According to the description of the above technical solution, the first device can be converted to the second device.
  • the device and the second device can also be converted to the first device.
  • the first device and the second device described here are only for the data transmission angle, and do not refer to the main earphone or the auxiliary earphone of the actual TWS earphone .

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Abstract

本发明实施例的主要目的在于提供一种蓝牙TWS设备间的数据传输方法,包括如下步骤:第一设备建立与蓝牙设备的真实连接,第二设备建立与蓝牙设备的虚拟连接;所述第一设备和所述第二设备在蓝牙链路时刻N接收所述蓝牙设备的数据包后,所述第一设备切换到接收第一辅助帧状态;所述第一设备在蓝牙链路时刻N+1,向所述第二设备发送第二辅助帧。还相应的提供一种包含上述第一设备和第二设备的蓝牙TWS设备。本发明实施例采用上述方案用于降低第一设备的功耗。

Description

蓝牙TWS设备间的数据传输方法及其蓝牙TWS设备 技术领域
本申请无线通信技术,具体涉及一种蓝牙TWS设备间的数据传输方法其蓝牙TWS设备。
背景技术
TWS(True Wireless Stereo,真正的无线立体声)耳机在最近几年越来越受到用户的欢迎,TWS技术是基于蓝牙芯片技术的发展。按其工作原理来说是指手机通过连接主耳机,再由主耳机通过无线方式快速连接副耳机,实现真正的蓝牙左右声道无线分离使用。不连接从音箱时,主音箱回到单声道音质。TWS技术运用到了蓝牙耳机领域,因此也催生了一个新的产品TWS蓝牙耳机。
目前市面上主流的TWS设备是采用转发的方式实现。即手机将音频数据发送给第一设备,然后第一设备再将收到的音频数据转发给第二设备。这种方式导致第一设备的功耗大,空中将所有音频数据进行转发,浪费了蓝牙带宽,降低了TWS设备的性能,增加了音频输出的延时等。
发明内容
有鉴于此,本发明实施例的主要目的在于提供一种蓝牙TWS设备间的数据传输方法,用于降低第一设备的功耗。本发明实施例是这样实现的,一种蓝牙TWS设备间的数据传输方法,包括:
第一设备建立与蓝牙设备的真实连接,第二设备建立与蓝牙设备的虚拟连接;
所述第一设备和所述第二设备在蓝牙链路时刻N接收所述蓝牙设备的数据包后,所述第一设备切换到接收第一辅助帧状态;
所述第一设备在蓝牙链路时刻N+1,向所述第二设备发送第二辅助帧。
进一步地,在所述第一设备和所述第二设备在蓝牙链路时刻N接收所述蓝牙设备的数据包的步骤后,所述方法进一步包括:
所述第二设备切换到发送第一辅助帧状态;
所述第二设备向所述第一设备发送所述第一辅助帧后切换到接收第二辅助帧状态。
进一步地,所述第一辅助帧包括如下命令:请求转发标志、分段校验信息、请求与蓝牙设备通信和请求数据发送中的至少一个;
所述第二辅助帧包括如下命令:通信切换命令、请求转发标志、分段校验信息和接受与蓝牙设备通信信息中的至少一个。
进一步地,所述方法进一步包括:当所述第二设备与所述蓝牙设备建立虚拟连接且所述第二设备没有正确收下所述蓝牙设备发送的数据包时,所述第一辅助帧包括请求转发标志。
进一步地,所述方法进一步包括:当所述第一设备收到所述请求转发标志时,如果所述第一设备也没有正确接收到所述蓝牙设备的数据,所述第一设备给所述蓝牙设备回复NAK信号,请求所述蓝牙设备重发数据;
当所述第一设备收到所述请求转发标志时,如果所述第一设备已经正确接收到所述蓝牙设备的数据,且所述第一设备决定不给所述第二设备转发时,所述第一设备给所述蓝牙设备回复NAK信号,请求所述蓝牙设备重发数据;
当所述第一设备收到所述请求转发标志时,如所述果第一设备已经正确接收蓝牙设备的数据,且所述第一设备决定给所述第二设备转发时,给所述蓝牙设备回复ACK信号或者NAK信号后转发所述数据给第二设备。
进一步地,所述方法进一步包括:
判断当前TWS链路的通信质量是否优于所述第一设备或第二设备与所述蓝牙设备间的通信质量,
如是,所述第一设备向所述第二设备转发数据或所述第二设备向所述第一设备转发数据;
如否,所述第一设备不向所述第二设备转发数据或所述第二设备不向所 述第一设备转发数据。
进一步地,所述方法进一步包括:
当所述第一设备完整收到所述蓝牙设备的数据,而所述第二设备没有完整收到所述蓝牙设备的数据时,所述第一辅助帧中包含所述第二设备接收所述蓝牙设备发送数据的分段校验信息,所述第一设备将所述分段校验信息与完整收到的所述蓝牙设备的数据生成的校验信息进行比对以确认所述第二设备出错的数据分段;
当所述第二设备完整收到所述蓝牙设备的数据,而所述第一设备没有完整收到所述蓝牙设备的数据时,所述第二辅助帧中包含所述第一设备接收所述蓝牙设备发送数据的分段校验信息,所述第二设备将所述分段校验信息与完整收到的所述蓝牙设备的数据生成的校验信息进行比对以确认所述第一设备出错的数据分段。
进一步地,所述方法进一步包括:
所述第一设备向所述第二设备转发所述出错的数据分段或所述第二设备向所述第一设备转发所述出错的数据分段。
进一步地,所述方法进一步包括:
当所述第二设备要与所述蓝牙设备直接进行通信时,所述第一辅助帧中包含请求与蓝牙设备通信命令,所述第一设备根据当前情况决定是否接受该命令,如是,所述第一设备向所述第二设备发送的所述第二辅助帧包括接受与蓝牙设备通信信息命令。
进一步地,所述方法进一步包括:
所述接受与蓝牙设备通信信息命令中包括一个比特的接受标志和两个比特的流控信息,所述流控信息包括与所述蓝牙设备建立真实连接的应答标志ARQN和数据序列号SEQN。
进一步地,所述方法进一步包括:
在蓝牙链路时刻N+2,所述第二设备等待接收所述第一设备发送的第一辅助帧,如果收到,则表明所述第二设备成功将虚拟连接切换为真实链路,所述第二设备建立与所述蓝牙设备的真实连接;
在蓝牙链路时刻N+3,所述第一设备等待接收所述第二设备发送的所述 第二辅助帧,如果收到,则表明所述第一设备成功将真实链路切换为虚拟链路,所述第一设备建立与所述蓝牙设备的虚拟连接。
进一步地,所述方法进一步包括:
当所述第二设备有额外数据需要发送给所述第一设备时,所述第一辅助帧中包含请求数据发送命令,所述第一设备根据当前链路情况决定是否发送第二辅助帧,如是,所述第一设备向所述第二设备发送的所述第二辅助帧包含通信切换命令。
进一步地,所述方法进一步包括:
当所述第一设备与所述蓝牙设备建立真实连接且所述第一设备没有正确收下蓝牙设备发送的数据包时,所述第二辅助帧包括请求转发标志。
进一步地,所述方法进一步包括:
所述第一设备通过所述第一辅助帧确认所述第二设备是否已经正确收下数据包。
进一步地,所述方法进一步包括:
当所述第一设备有额外数据需要发送给所述第二设备时,所述第一设备根据当前的链路情况,决定是否发送所述第二辅助帧,如是,所述第一设备向所述第二设备发送的所述第二辅助帧包含通信切换命令。
进一步地,所述第二设备建立与蓝牙设备的虚拟连接包括:
所述第二设备与所述第一设备建立连接以获取与所述蓝牙设备建立连接的参数。
进一步地,所述第二设备与所述第一设备建立连接以获取与所述蓝牙设备建立连接的参数进一步包括:
所述第一设备与所述第二设备建立蓝牙通信连接,所述第一设备将所述参数传输给所述第二设备;或
所述第一设备将所述参数广播,所述第二设备通过扫描收取所述参数;或
所述第二设备通过OOB通信方式从所述第一设备获取所述参数;或
所述第一设备将所述参数发送给第三设备,所述第二设备从所述第三设备获取所述参数。
根据本发明实施例的另一方面,本发明实施例的目的在于提供一种蓝牙TWS设备,用于降低第一设备的功耗。本发明实施例是这样实现的,一种蓝牙TWS设备,包括第一设备和第二设备;
所述第一设备,用于与蓝牙设备建立真实连接,在蓝牙链路时刻N接收所述蓝牙设备的数据包后,切换到接收第一辅助帧状态;并用于在蓝牙链路时刻N+1,向所述第二设备发送第二辅助帧;
所述第二设备,用于与蓝牙设备建立虚拟连接,在蓝牙链路时刻N接收所述蓝牙设备的数据包后切换到发送第一辅助帧状态,向所述第一设备发送所述第一辅助帧后切换到接收第二辅助帧状态。
根据上述技术方案,本发明实施例具有如下效果:第一设备和蓝牙设备建立一条无线连接,而第二设备通过直接或者间接的方式从第一设备得知所述无线链路的一些相关参数,第二设备根据得到的参数建立一条与蓝牙设备的虚拟连接。第一设备和第二设备之间通过第一辅助帧和第二辅助帧的技术特征实现TWS链路的建立,以在TWS设备间进行数据转发,数据应答或者其他数据请求。虚拟连接可以接收到蓝牙设备发送给第一设备的数据,也可以在需要的时候通过建立的TWS链路转换为真实连接,给蓝牙设备发送数据。第一设备和第二设备同时接收蓝牙设备的数据,进行真实蓝牙传输,大大节约了第一设备的功耗、节省了蓝牙带宽、降低数据流延时、提升了TWS设备的性能。在TWS设备没有准确收下数据时,两者之间进行数据转发,或者进行错误数据转发,节省蓝牙带宽和TWS设备间的通信效率。
附图说明
通过阅读参照以下附图所作的对非限制性实施例所作的详细描述,本申请的其它特征、目的和优点将会变得更明显:
图1示出了本申请提供的一种蓝牙TWS设备间的数据传输方法流程图;
图2示出了本申请提供的另一种蓝牙TWS设备间的数据传输方法流程图;
图3示出了本申请提供的一种蓝牙设备与TWS设备时序示意图;
图4示出了本申请提供的第二设备从虚拟连接转换为真实连接时序图;
图5示出了本申请提供的蓝牙TWS设备与蓝牙设备的连接示意图。
具体实施方式
下面结合附图和实施例对本申请作进一步的详细说明。可以理解的是,此处所描述的具体实施例仅仅用于解释相关发明,而非对该发明的限定。另外还需要说明的是,为了便于描述,附图中仅示出了与有关发明相关的部分。
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,以下实施例中的步骤顺序仅为列举,在不冲突的情况下可以调整。
如图1所示,本发明实施例是这样实现的,一种蓝牙TWS设备间的数据传输方法,包括如下步骤:
S101,第一设备建立与蓝牙设备的真实连接,第二设备建立与蓝牙设备的虚拟连接;
S102,所述第一设备和所述第二设备在蓝牙链路时刻N接收所述蓝牙设备的数据包后,所述第一设备切换到接收第一辅助帧状态;
S103,所述第一设备在蓝牙链路时刻N+1,向所述第二设备发送第二辅助帧。
所述第二设备建立与蓝牙设备的虚拟连接包括:所述第二设备与所述第一设备建立连接以获取与所述蓝牙设备建立连接的参数。如图5所示,第一设备和蓝牙设备建立一条无线连接,而第二设备通过直接或者间接的方式从第一设备得知所述无线链路的一些相关参数以建立和蓝牙设备的虚拟连接。第二设备根据得到的参数建立一条与蓝牙设备的虚拟连接。该虚拟连接可以接收到蓝牙设备发送给第一设备的数据,也可以在需要的时候转换为真实连接,给蓝牙设备发送数据。第一设备和蓝牙设备建立的是一条标准蓝牙ACL链路,是一条真实连接。
所述第二设备与所述第一设备建立连接以获取与所述蓝牙设备建立连 接的参数可通过如下方式:所述第一设备与所述第二设备建立蓝牙通信连接,所述第一设备将所述参数传输给所述第二设备;或所述第一设备将所述参数广播,所述第二设备通过扫描收取所述参数;或所述第二设备通过OOB通信方式从所述第一设备获取所述参数;或所述第一设备将所述参数发送给第三设备,所述第二设备从所述第三设备获取所述参数。第二设备根据得到的参数建立一条虚拟连接,可以接收到蓝牙设备发送给第一设备的数据。
本发明提供一优选实施例,在上述实施例的基础上,如图2所示,蓝牙TWS设备间的数据传输方法,包括如下步骤:
S201,第一设备建立与蓝牙设备的真实连接,第二设备建立与蓝牙设备的虚拟连接;
S202,所述第一设备和所述第二设备在蓝牙链路时刻N接收所述蓝牙设备的数据包后,所述第一设备切换到接收第一辅助帧状态;
S203,所述第二设备切换到发送第一辅助帧状态;所述第二设备向所述第一设备发送所述第一辅助帧后切换到接收第二辅助帧状态。
S204,所述第一设备在蓝牙链路时刻N+1,向所述第二设备发送第二辅助帧。
下面结合图3,对上述实施例的流程进行详细说明,第一设备建立与蓝牙设备的真实连接,第二设备建立与蓝牙设备的虚拟连接,当上述连接建立完成后,当第一设备和第二设备接收完蓝牙设备发送的数据包后,第一设备切换到接收第一辅助帧的状态,第一设备在蓝牙链路时刻N+1,向所述第二设备发送第二辅助帧。而第二设备切换到发送第一辅助帧的状态。假如第一设备已经正确收下蓝牙设备的数据,当第二设备没有正确收下蓝牙设备的数据时,会通过第一辅助帧给第一设备发送转发请求。第一设备收到转发请求后,则在蓝牙链路时刻N+1给蓝牙设备发送NAK信息,当然第一设备也可以不给与应答。当第一设备没能成功接收第一辅助帧信息时,也假设第二设备发送了请求数据转发请求。第二设备在发送完第一辅助帧后,则进入接收第二辅助帧状态。第一设备给蓝牙设备发送了NAK信息后,如果确定要给第二设备转发数据,则通过第二辅助帧给第二设备发送通信切换命令。最后第一设备和第二设备切换到TWS通信,进行数据转发。如果第一设备分析 认为不需给第二设备转发,则进入蓝牙链路时刻N+2,等待接收蓝牙设备的下一个数据。而第二设备在接收第二辅助帧超时后,也进入蓝牙链路时刻N+2,等待接收蓝牙设备的下一个数据。由于之前第一设备给蓝牙设备发送了NAK信息,蓝牙设备后续会对数据进行重传。如果第二设备已经正确收下蓝牙设备的数据,则给第一设备发送的第一辅助帧不包含转发请求。第一设备收到一个不包含请求数据转发请求的第一辅助帧后,在蓝牙链路时刻N+1给蓝牙设备发送ACK信息。当第一设备在蓝牙链路时刻N没有正确收下蓝牙设备的数据时,则在蓝牙链路时刻N+1给蓝牙设备发送NAK信息。同时,如果第一设备接收到的第一辅助帧中不包含转发请求,可以在需要的时候通过第二辅助帧给第二设备发送转发请求和通信切换命令。
本发明提供一优选实施例,第一设备或者第二设备进行转发可以只在合适的时机进行,需要判断当前TWS链路的通信质量是否优于TWS设备与所述蓝牙设备间的通信质量,当监测到第一设备和第二设备的通信质量良好,而第一设备或者第二设备至少有一方与蓝牙设备的通信质量较差时,才启动TWS设备转发功能,如是,所述第一设备向所述第二设备转发数据或所述第二设备向所述第一设备转发数据;如否,所述第一设备不向所述第二设备转发数据或所述第二设备不向所述第一设备转发数据。如果是第一设备转发给第二设备,则判断第二设备与蓝牙设备的通信质量;如果是第二设备转发给第一设备,则判断第一设备与蓝牙设备的通信质量,也可以在判断中只要第一设备或者第二设备中有一个与蓝牙设备的通信质量差于TWS链路的通信质量,则进行转发。
本发明提供一优选实施例,本发明实施例中第一设备和第二设备间相互发送的第一辅助帧或第二辅助帧,主要用于维持第二设备与蓝牙设备间建立的虚拟链路,也辅助TWS设备之间进行通信。第一辅助帧包括如下命令:请求转发标志、分段校验信息、请求与蓝牙设备通信和请求数据发送中的至少一个;第二辅助帧包括如下命令:通信切换命令、请求转发标志、分段校验信息和接受与蓝牙设备通信信息中的至少一个。当第二设备没有正确收下蓝牙设备发送的数据包时,第二设备可能在第一辅助帧中发送请求转发标志。第一辅助帧中可能包含第二设备接收蓝牙设备发送的数据的分段校验信 息,当第一设备收下蓝牙设备的数据,而第二设备没有收下蓝牙设备的数据时,第一设备通过该信息可以得知第二设备哪些分段的数据出错,并只对出错的分段的数据进行转发。第一辅助帧中可能包含“请求与蓝牙设备通信”标志,当第二设备期望与蓝牙设备直接进行通信时,比如需要直接发送数据给蓝牙设备,第二设备会通过第一辅助帧给第一设备发送请求与蓝牙设备通信信息,第一设备判断是否接受请求,通过发送第二辅助帧给出应答。第一辅助帧中可能包含TWS设备“请求数据发送”信息。当第二设备有额外的数据需要发送给第一设备时,会在第一辅助帧中加入“请求数据发送”信息。本发明提供一优选实施例,第一设备收到“请求数据发送”命令后,根据当前链路情况决定是否发送第二辅助帧进行通信切换,接收第二设备的额外数据。当所述第二设备有额外数据需要发送给所述第一设备时,所述第一辅助帧中包含请求数据发送命令,所述第一设备根据当前链路情况决定是否发送第二辅助帧,如是,所述第一设备向所述第二设备发送的所述第二辅助帧包含通信切换命令。这里的额外数据一般指上层用户数据,主要是TWS设备间各种信息的同步,比如微调播放速度,保持两个主设备和从设备播放同一时刻的音频数据,比如同步按键信息、同步电量信息、同步提示音、同步工作状态等,也可以包含底层链路控制数据,比如跳频序列,功率控制,或者没有数据,比如空包,只为了同步一下TWS设备的时序。
本发明提供一优选实施例,当所述第二设备与所述蓝牙设备建立虚拟连接且所述第二设备没有正确收下所述蓝牙设备发送的数据包时,所述第一辅助帧包括请求转发标志。当所述第一设备收到所述请求转发标志时,如果所述第一设备也没有正确接收到所述蓝牙设备的数据,所述第一设备给所述蓝牙设备回复NAK信号,请求所述蓝牙设备重发数据;当所述第一设备收到所述请求转发标志时,如果所述第一设备已经正确接收到所述蓝牙设备的数据,且所述第一设备决定不给所述第二设备转发时,所述第一设备给所述蓝牙设备回复NAK信号,请求所述蓝牙设备重发数据;当所述第一设备收到所述请求转发标志时,如所述果第一设备已经正确接收蓝牙设备的数据,且所述第一设备决定给所述第二设备转发时,给所述蓝牙设备回复ACK信号或者NAK信号后转发所述数据给第二设备。具体来说,蓝牙设备在蓝牙链 路时刻N给第一设备发送一包数据时,第二设备也在蓝牙链路时刻N接收该数据包。当第一设备和第二设备接收完蓝牙设备发送的数据包后,第一设备切换到接收第一辅助帧的状态,而第二设备切换到发送第一辅助帧的状态。当第一设备正确收下蓝牙设备的数据,且从第一辅助帧的信息中收到第二设备的转发请求时,可选的在蓝牙链路时刻N+1给蓝牙设备发送NAK信息。当第一设备没能成功接收第一辅助帧信息时,也假设第二设备发送了请求数据转发请求。然后在NAK信息发送完成后,给第二设备发送第二辅助帧。第二设备收到第二辅助帧后,进入等待接收状态,而第一设备则进入转发状态。反之,当第一设备没有正确收下蓝牙设备的数据,且从第一辅助帧的信息中得知第二设备没有发送转发请求时,可选的在蓝牙链路时刻N+1给蓝牙设备发送NAK信息。然后在NAK信息发送完成后,给第二设备发送第二辅助帧。而第二设备则在发送完第一个辅助帧后进入等待接收第二辅助帧的状态。最后第二设备进入转发状态,将从蓝牙设备收到的数据包转发给第一设备。如果第二设备已经正确收下蓝牙设备的数据,则给第一设备发送的第一辅助帧不包含转发请求。假如第一设备也已经正确收下蓝牙设备的数据,则在蓝牙链路时刻N+1给蓝牙设备发送ACK信息。
本发明提供一优选实施例,当所述第一设备与所述蓝牙设备建立真实连接且所述第一设备没有正确收下蓝牙设备发送的数据包时,所述第二辅助帧包括请求转发标志。并进一步通过第一辅助帧确认第二设备是否已经正确收下数据包。如果第一辅助帧中包含请求转发标志这个信息,那么这个信息可以用一个比特表示,比如1表示请求转发,0表示不请求转发。此时,只要第一设备没有收到第一辅助帧,或者收到的第一辅助帧中请求转发标志为1,则意味着第二设备没有正确收下数据包。反之,如果请求转发标志为0,则表示第二设备已经正确收下数据包,或者采用另一种方式,如果第一辅助帧中包含分段校验信息,那么当第一设备收到第一辅助帧,且第一辅助中的分段校验信息与第一设备根据收到的数据包计算出来的分段校验信息一致时,则表示第二设备已经正确收下数据包。本领域技术人员可以理解,第一设备根据链路情况,觉得需要第二设备转发数据时,发送请求转发标志,其方案与第一辅助帧中包含请求转发标志的方案完全相同。
本发明提供一优选实施例,所述第一设备向所述第二设备转发所述出错的数据分段或所述第二设备向所述第一设备转发所述出错的数据分段。当所述第一设备完整收到所述蓝牙设备的数据,而所述第二设备没有完整收到所述蓝牙设备的数据时,所述第一辅助帧中包含所述第二设备接收所述蓝牙设备发送数据的分段校验信息,所述第一设备将所述分段校验信息与完整收到的所述蓝牙设备的数据生成的校验信息进行比对以确认所述第二设备出错的数据分段。当所述第二设备完整收到所述蓝牙设备的数据,而所述第一设备没有完整收到所述蓝牙设备的数据时,所述第二辅助帧中包含所述第一设备接收所述蓝牙设备发送数据的分段校验信息,所述第二设备将所述分段校验信息与完整收到的所述蓝牙设备的数据生成的校验信息进行比对以确认所述第一设备出错的数据分段。第二设备通过该信息可以得知第一设备哪些分段的数据出错,并只对出错的分段的数据进行转发。第一辅助帧中可能包含第二设备接收蓝牙设备发送的数据的分段校验信息,当第一设备收下蓝牙设备的数据,而第二设备没有收下蓝牙设备的数据时,第一设备通过该信息可以得知第二设备哪些分段的数据出错,并只对出错的分段的数据进行转发。
本发明提供一优选实施例,当所述第二设备要与所述蓝牙设备直接进行通信时,所述第一辅助帧中包含请求与蓝牙设备通信命令,所述第一设备根据当前情况决定是否接受该命令,如是,所述第一设备向所述第二设备发送的所述第二辅助帧包括接受与蓝牙设备通信信息命令。优选地,所述接受与蓝牙设备通信信息命令中包括一个比特的接受标志和两个比特的流控信息,所述流控信息包括与所述蓝牙设备建立真实连接的应答标志ARQN和数据序列号SEQN。在蓝牙链路时刻N+2,所述第二设备等待接收所述第一设备发送的第一辅助帧,如果收到,则表明所述第二设备成功将虚拟连接切换为真实链路,所述第二设备建立与所述蓝牙设备的真实连接;在蓝牙链路时刻N+3,所述第一设备等待接收所述第二设备发送的所述第二辅助帧,如果收到,则表明所述第一设备成功将真实链路切换为虚拟链路,所述第一设备建立与所述蓝牙设备的虚拟连接。
具体来说,当第二设备期望与蓝牙设备直接进行通信时,比如需要直接 发送数据给蓝牙设备。第二设备会通过第一辅助帧给第一设备发送请求与蓝牙设备通信信息。第一设备判断是否接受请求,通过发送第二辅助帧给出应答。第二辅助帧中可能包含“接受与蓝牙设备通信信息”。第一设备如果接受第二设备在第一辅助帧中的与蓝牙设备通信请求,则第一设备在第二辅助帧中发送“接受与蓝牙设备通信信息”。该“接受与蓝牙设备通信信息”主要是一个比特的接受标志和两个比特的流控信息。第二设备根据“接受与蓝牙设备通信信息”中的流控信息,才知道应该给蓝牙设备发送的应答标志ARQN和数据序列号SEQN是多少。第一设备可能由于当前有需要应答的数据包正在发送给蓝牙设备,而拒绝第二设备的请求。第一设备也可能由于一些关键流程正在进行(比如蓝牙设备正在更新加密密钥等等)而拒绝第二设备的请求。上述表格中第二辅助帧包含的内容的顺序可以任意调整,且第二辅助帧至少包含其中的一项内容。
下面结合图4,对上述第二设备转换为真实连接的过程进行详细描述。第二设备期望与蓝牙设备直接进行通信,第二设备在蓝牙链路时刻N的第一辅助帧中给第一设备发送了“请求与蓝牙设备通信”标志。第一设备收到后,判断可以接受对方的请求,则在蓝牙链路时刻N+1的第二辅助帧中给第二设备发送“接受与蓝牙设备通信信息”。然后第一设备在蓝牙链路时刻N+2切换为第二设备,给第二设备发送第一辅助帧。第二设备在蓝牙链路时刻N+1收到第一设备的“接受与蓝牙设备通信信息”后,在蓝牙链路时刻N+2切换为第一设备,等待接收第一设备的第一辅助帧。如果第二设备在蓝牙链路时刻N+2收到第一辅助帧,则意味着第二设备已经成功将虚拟连接切换为真实链路。而在之后的蓝牙链路时刻N+3中,第二设备需要给第一设备发送第二辅助帧。第一设备在蓝牙链路时刻N+3收到第二辅助帧,则意味着第一设备已经切换为虚拟连接。所以第一设备在发送完“接受与蓝牙设备通信信息”后,会启动一个超时,需要在超时前收到第二辅助帧才意味着切换成功。否则在超时后,恢复为第一设备。而第二设备在接收到“接受与蓝牙设备通信信息”后,会启动一个超时,需要在超时前收到第一辅助帧才意味着切换成功。否则在超时后,恢复为第二设备。可以看到转换完成后,第二设备变为上述的第一设备,第一设备变为上述的第二设备。并且,第二设备的连接变 为真实连接,而第一设备的连接变为虚拟连接。
相应的,图5示出了本申请提供的蓝牙TWS设备与蓝牙设备的连接示意图,本发明实施例提供一种基于上述实施例的蓝牙TWS设备,包括第一设备和第二设备;
所述第一设备,用于与蓝牙设备建立真实连接,在蓝牙链路时刻N接收所述蓝牙设备的数据包后,切换到接收第一辅助帧状态;并用于在蓝牙链路时刻N+1,向所述第二设备发送第二辅助帧;
所述第二设备,用于与蓝牙设备建立虚拟连接,在蓝牙链路时刻N接收所述蓝牙设备的数据包后切换到发送第一辅助帧状态,向所述第一设备发送所述第一辅助帧后切换到接收第二辅助帧状态。
根据本发明提供的实施例,第一设备和蓝牙设备建立一条无线连接,而第二设备通过直接或者间接的方式从第一设备得知所述无线链路的一些相关参数。第二设备根据得到的参数建立一条与蓝牙设备的虚拟连接。该虚拟连接可以接收到蓝牙设备发送给第一设备的数据,并且借助第一辅助帧,可以使得该虚拟连接变成一条真实连接,给蓝牙设备发送数据。所以本发明实施例中的无论是第一设备还是第二设备,只是在描述其数据传输过程中所实现主从设备的角度来描述,根据上述技术方案的描述,第一设备可以转换为第二设备,第二设备亦可以转换为第一设备,本领域技术人员可以理解,这里所描述的第一设备和第二设备仅针对数据传输角度,而并非指实际中TWS耳机的主耳机或副耳机。
以上描述仅为本申请的较佳实施例以及对所运用技术原理的说明。本领域技术人员应当理解,本申请中所涉及的发明范围,并不限于上述技术特征的特定组合而成的技术方案,同时也应涵盖在不脱离所述发明构思的情况下,由上述技术特征或其等同特征进行任意组合而形成的其它技术方案。例如上述特征与本申请中公开的(但不限于)具有类似功能的技术特征进行互相替换而形成的技术方案。

Claims (18)

  1. 一种蓝牙TWS设备间的数据传输方法,其特征在于,包括:
    第一设备建立与蓝牙设备的真实连接,第二设备建立与蓝牙设备的虚拟连接;
    所述第一设备和所述第二设备在蓝牙链路时刻N接收所述蓝牙设备的数据包后,所述第一设备切换到接收第一辅助帧状态;
    所述第一设备在蓝牙链路时刻N+1,向所述第二设备发送第二辅助帧。
  2. 根据权利要求1所述的蓝牙TWS设备间的数据传输方法,其特征在于,在所述第一设备和所述第二设备在蓝牙链路时刻N接收所述蓝牙设备的数据包的步骤后,所述方法进一步包括:
    所述第二设备切换到发送第一辅助帧状态;
    所述第二设备向所述第一设备发送所述第一辅助帧后切换到接收第二辅助帧状态。
  3. 根据权利要求1或2所述的蓝牙TWS设备间的数据传输方法,其特征在于,
    所述第一辅助帧包括如下命令:请求转发标志、分段校验信息、请求与蓝牙设备通信和请求数据发送中的至少一个;
    所述第二辅助帧包括如下命令:通信切换命令、请求转发标志、分段校验信息和接受与蓝牙设备通信信息中的至少一个。
  4. 根据权利要求3所述的蓝牙TWS设备间的数据传输方法,其特征在于,所述方法进一步包括:
    当所述第二设备与所述蓝牙设备建立虚拟连接且所述第二设备没有正确收下所述蓝牙设备发送的数据包时,所述第一辅助帧包括请求转发标志。
  5. 根据权利要求4所述的蓝牙TWS设备间的数据传输方法,其特征在于,所述方法进一步包括:
    当所述第一设备收到所述请求转发标志时,如果所述第一设备也没有正确接收到所述蓝牙设备的数据,所述第一设备给所述蓝牙设备回复NAK信号,请求所述蓝牙设备重发数据;
    当所述第一设备收到所述请求转发标志时,如果所述第一设备已经正确接收到所述蓝牙设备的数据,且所述第一设备决定不给所述第二设备转发时,所述第一设备给所述蓝牙设备回复NAK信号,请求所述蓝牙设备重发数据;
    当所述第一设备收到所述请求转发标志时,如所述果第一设备已经正确接收蓝牙设备的数据,且所述第一设备决定给所述第二设备转发时,给所述蓝牙设备回复ACK信号或者NAK信号后转发所述数据给第二设备。
  6. 根据权利要求5所述的蓝牙TWS设备间的数据传输方法,其特征在于,所述方法进一步包括:
    判断当前TWS链路的通信质量是否优于所述第一设备或第二设备与所述蓝牙设备间的通信质量,
    如是,所述第一设备向所述第二设备转发数据或所述第二设备向所述第一设备转发数据;
    如否,所述第一设备不向所述第二设备转发数据或所述第二设备不向所述第一设备转发数据。
  7. 根据权利要求3所述的蓝牙TWS设备间的数据传输方法,其特征在于,所述方法进一步包括:
    当所述第一设备完整收到所述蓝牙设备的数据,而所述第二设备没有完整收到所述蓝牙设备的数据时,所述第一辅助帧中包含所述第二设备接收所述蓝牙设备发送数据的分段校验信息,所述第一设备将所述分段校验信息与完整收到的所述蓝牙设备的数据生成的校验信息进行比对以确认所述第二设备出错的数据分段;
    当所述第二设备完整收到所述蓝牙设备的数据,而所述第一设备没有完整收到所述蓝牙设备的数据时,所述第二辅助帧中包含所述第一设备接收所述蓝牙设备发送数据的分段校验信息,所述第二设备将所述分段校验信息与完整收到的所述蓝牙设备的数据生成的校验信息进行比对以确认所述第一设备出错的数据分段。
  8. 根据权利要求7所述的蓝牙TWS设备间的数据传输方法,其特征在于,所述方法进一步包括:
    所述第一设备向所述第二设备转发所述出错的数据分段或所述第二设备向所述第一设备转发所述出错的数据分段。
  9. 根据权利要求3所述的蓝牙TWS设备间的数据传输方法,其特征在于,所述方法进一步包括:
    当所述第二设备期望与所述蓝牙设备直接进行通信时,所述第一辅助帧中包含请求与蓝牙设备通信命令,所述第一设备根据当前情况决定是否接受该命令,如是,所述第一设备向所述第二设备发送的所述第二辅助帧包括接受与蓝牙设备通信信息命令。
  10. 根据权利要求9所述的蓝牙TWS设备间的数据传输方法,其特征在于,所述方法进一步包括:
    所述接受与蓝牙设备通信信息命令中包括一个比特的接受标志和两个比特的流控信息,所述流控信息包括与所述蓝牙设备建立真实连接的应答标志ARQN和数据序列号SEQN。
  11. 根据权利要求10所述的蓝牙TWS设备间的数据传输方法,其特征在于,所述方法进一步包括:
    在蓝牙链路时刻N+2,所述第二设备等待接收所述第一设备发送的第一辅助帧,如果收到,则表明所述第二设备成功将虚拟连接切换为真实链路,所述第二设备建立与所述蓝牙设备的真实连接;
    在蓝牙链路时刻N+3,所述第一设备等待接收所述第二设备发送的所述第二辅助帧,如果收到,则表明所述第一设备成功将真实链路切换为虚拟链路,所述第一设备建立与所述蓝牙设备的虚拟连接。
  12. 根据权利要求3所述的蓝牙TWS设备间的数据传输方法,其特征在于,所述方法进一步包括:
    当所述第二设备有额外数据需要发送给所述第一设备时,所述第一辅助帧中包含请求数据发送命令,所述第一设备根据当前链路情况决定是否发送第二辅助帧,如是,所述第一设备向所述第二设备发送的所述第二辅助帧包含通信切换命令。
  13. 根据权利要求3所述的蓝牙TWS设备间的数据传输方法,其特征在于,所述方法进一步包括:
    当所述第一设备与所述蓝牙设备建立真实连接且所述第一设备没有正确收下蓝牙设备发送的数据包时,所述第二辅助帧包括请求转发标志。
  14. 根据权利要求13所述的蓝牙TWS设备间的数据传输方法,其特征在于,所述方法进一步包括:
    所述第一设备通过所述第一辅助帧确认所述第二设备是否已经正确收下数据包。
  15. 根据权利要求3所述的蓝牙TWS设备间的数据传输方法,其特征在于,所述方法进一步包括:
    当所述第一设备有额外数据需要发送给所述第二设备时,所述第一设备根据当前的链路情况,决定是否发送所述第二辅助帧,如是,所述第一设备向所述第二设备发送的所述第二辅助帧包含通信切换命令。
  16. 根据权利要求3所述的蓝牙TWS设备间的数据传输方法,其特征在于,所述第二设备建立与所述蓝牙设备的虚拟连接包括:
    所述第二设备与所述第一设备建立连接以获取与所述蓝牙设备建立连接的参数。
  17. 根据权利要求16所述的蓝牙TWS设备间的数据传输方法,其特征在于,所述第二设备与所述第一设备建立连接以获取与所述蓝牙设备建立连接的参数进一步包括:
    所述第一设备与所述第二设备建立蓝牙通信连接,所述第一设备将所述参数传输给所述第二设备;或
    所述第一设备将所述参数广播,所述第二设备通过扫描收取所述参数;或
    所述第二设备通过OOB通信方式从所述第一设备获取所述参数;或
    所述第一设备将所述参数发送给第三设备,所述第二设备从所述第三设备获取所述参数。
  18. 一种蓝牙TWS设备,包括第一设备和第二设备,其特征在于,
    所述第一设备,用于与蓝牙设备建立真实连接,在蓝牙链路时刻N接收所述蓝牙设备的数据包后,切换到接收第一辅助帧状态;并用于在蓝牙链路时刻N+1,向所述第二设备发送第二辅助帧;
    所述第二设备,用于与蓝牙设备建立虚拟连接,在蓝牙链路时刻N接收所述蓝牙设备的数据包后切换到发送第一辅助帧状态,向所述第一设备发送所述第一辅助帧后切换到接收第二辅助帧状态。
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