WO2021092859A1 - 建立iso链路的方法和ble设备 - Google Patents

建立iso链路的方法和ble设备 Download PDF

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Publication number
WO2021092859A1
WO2021092859A1 PCT/CN2019/118549 CN2019118549W WO2021092859A1 WO 2021092859 A1 WO2021092859 A1 WO 2021092859A1 CN 2019118549 W CN2019118549 W CN 2019118549W WO 2021092859 A1 WO2021092859 A1 WO 2021092859A1
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Prior art keywords
iso
broadcast
link
slave device
message
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PCT/CN2019/118549
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English (en)
French (fr)
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陈刚
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深圳市汇顶科技股份有限公司
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Priority to CN201980005119.9A priority Critical patent/CN114830699A/zh
Priority to PCT/CN2019/118549 priority patent/WO2021092859A1/zh
Publication of WO2021092859A1 publication Critical patent/WO2021092859A1/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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the embodiments of the present application relate to the field of information technology, and more specifically, to a method for establishing an ISO link and a BLE device.
  • an isochronous (ISO) link between Bluetooth Low Energy (BLE) devices an asynchronous connectionless (ACL) link needs to be established first, and ISO is established on the basis of the ACL link link. Therefore, the ISO link and the ACL link are bound, and the establishment of the ISO link depends on the ACL link. Therefore, how to establish an ISO link more flexibly has become an urgent problem to be solved.
  • ISO isochronous
  • BLE Bluetooth Low Energy
  • the embodiments of the present application provide a method for establishing an ISO link and a BLE device, which can establish an ISO link more flexibly.
  • a method for establishing an ISO link is provided.
  • the method is used to establish an ISO link between two BLE devices.
  • the method includes: configuration parameter information of the master device in the two BLE devices, so The parameter information is used to establish an ISO link between the master device and the slave devices of the two BLE devices; the master device scans the broadcast messages from the slave device according to the parameter information, and the broadcast The message is used to establish the ISO link; if the broadcast message is scanned, the master device sends an instruction message to the slave device, and the instruction message carries an instruction message used between the master device and the slave device Time information for data interaction; the master device performs data interaction with the slave device based on the time information; if at least one data interaction is successful within a preset number of ISO intervals, the master device determines the ISO The link is established.
  • the master device configuration parameter information in the two BLE devices includes: the host layer of the master device sends the parameter information to the link layer of the master device; According to the parameter information, the link layer sends a response message to the host layer.
  • the time information includes: a time anchor point for performing the data exchange, and the length of time occupied by the ISO link in each ISO interval.
  • the preset number is 6.
  • the parameter information includes at least one of the following information: the time interval for scanning the broadcast message, the length of the time window for scanning the broadcast message, the filtering strategy, and the End address type, the address of the slave device, the local address type, the ISO interval, the sub-interval in the ISO interval, the data length during the data exchange, the ISO link in the ISO interval The maximum number of sub-intervals used, the number of data to be transmitted on the ISO link within the ISO interval, and the maximum number of ISO intervals required to complete the data interaction.
  • a method for establishing an ISO link is provided.
  • the method is used to establish an ISO link between two BLE devices.
  • the method includes: configuring broadcast parameters for a slave device in the two BLE devices;
  • the slave device sends a broadcast message according to the broadcast parameters, the broadcast message is used to establish the ISO link;
  • the slave device receives an indication message sent by the master device based on the broadcast message, and the indication message carries Time information used for data interaction between the master device and the slave device; the slave device performs data interaction with the master device based on the time information; if it is within a preset number of ISO intervals
  • the slave device determines that the establishment of the ISO link is completed.
  • the slave device entering the broadcast state includes: the host layer of the slave device sends a broadcast parameter to the link layer of the slave device, and the broadcast parameter is used for the slave device to send The broadcast message; in response to the broadcast parameter, the link layer sends a first response message to the host layer; the host layer sends a broadcast enable to the link layer based on the first response message Message; the link layer starts a broadcast function according to the broadcast enable message; in response to the broadcast enable message, the link layer sends a second response message to the host layer.
  • the time information includes: a time anchor point for performing the data exchange, and the length of time occupied by the ISO link in each ISO interval.
  • the preset number is 6.
  • the broadcast parameters include at least one of the following information:
  • the time interval for sending the broadcast message the broadcast type, the local address type, the opposite end address type, the address of the slave device, the channel used to send the broadcast message, and the filtering strategy.
  • a BLE device which includes a functional module for executing the method in the first aspect or any possible implementation of the first aspect.
  • a BLE device which includes a functional module for executing the second aspect or any possible implementation of the second aspect.
  • a BLE chip in a fifth aspect, includes a processor and a memory, the memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to execute the first A method in one aspect or any possible implementation of the first aspect.
  • a BLE chip in a sixth aspect, includes a processor and a memory, the memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to execute the first The second aspect or any possible implementation of the second aspect.
  • a computer-readable storage medium is provided, and the computer-readable storage medium is used to store a computer program.
  • the processor when the computer program is executed by the processor, the processor is caused to execute the method in the first aspect or any possible implementation manner of the first aspect.
  • a computer-readable storage medium is provided, and the computer-readable storage medium is used to store a computer program.
  • the processor when the computer program is executed by the processor, the processor is caused to execute the second aspect or the method in any possible implementation manner of the second aspect.
  • a computer program product including computer program instructions that cause a computer to execute the foregoing first aspect or any possible implementation of the first aspect.
  • a computer program product including computer program instructions, which cause a computer to execute the foregoing second aspect or any possible implementation of the second aspect.
  • the master device scans the broadcast message sent by the slave device, and when the broadcast message is scanned, sends an indication message to the slave device, which carries the information for the Time information for data exchange between the master device and the slave device. After that, the master device and the slave device exchange data based on the time information, and complete the establishment of the ISO link after the interaction is successful. It can be seen that with this method, the establishment of the ISO link does not need to rely on the ACL link, so that the establishment of the ISO link is more flexible and efficient, and the BLE bandwidth utilization rate is improved.
  • Fig. 1 is a flow interaction diagram of a method for establishing an ISO link according to an embodiment of the present application.
  • Fig. 2 is a flow interaction diagram based on a possible implementation of the method shown in Fig. 1.
  • Figure 3 is a schematic diagram of the time relationship followed by the data interaction between the master device and the slave device.
  • Figure 4 is a schematic diagram of the time relationship followed when two ISO links are established.
  • Fig. 5 is a schematic block diagram of a BLE device according to an embodiment of the present application.
  • Fig. 6 is a schematic block diagram of a BLE device according to an embodiment of the present application.
  • Fig. 7 is a schematic structural diagram of a BLE chip according to an embodiment of the present application.
  • the synchronization link between two BLE devices that is, the ISO link is used to transmit synchronization information between the two.
  • the ISO link takes as the highest priority to ensure the timeliness of data delivery, and is used to transmit time-limited information such as sound.
  • the establishment of ISO links needs to rely on other reference links, such as ACL links or broadcast links. This causes the establishment of ISO links to be inflexible and more complicated.
  • the embodiment of the present application provides a method for establishing an ISO link, which may not rely on the establishment of other links, thereby establishing an ISO link more flexibly.
  • Fig. 1 is a flow interaction diagram of a method for establishing an ISO link according to an embodiment of the present application. This method is used to establish an ISO link between two BLE devices, which are master and slave respectively. For each BLE device, it may only have the role of the master device, or only the role of the slave device, or may have the roles of both the master device and the slave device. When a BLE device has the roles of a master device and a slave device at the same time, before establishing the ISO link, for example, the user can choose whether the BLE device is the master device or the slave device during the establishment of the ISO link.
  • the method shown in Figure 1 is executed by the master device (ISO-Master) and the slave device (ISO-Slave).
  • the master device and the slave device can establish an ISO link through the method shown in Figure 1.
  • the master device includes the host layer (Host) and the link layer, and the slave device also includes the host and link layer.
  • the method 100 includes some or all of the following steps.
  • the master device configures parameter information.
  • the master device configures the parameter information to enter the initiating state.
  • the parameter information is used to establish an ISO link between the master device and the slave device.
  • the parameter information may include at least one of the following information, for example:
  • Time interval for scanning broadcast messages (LE_Scan_Interval), length of time window for scanning broadcast messages (LE_Scan_Window), filtering strategy (Initiator_Filter_Policy), peer address type (Peer_Address_Type), peer address (Peer_Address), local address type (Own_Address_Type), ISO time interval (ISO Interval), sub-interval within ISO Interval (Sub Interval) length, data length of data interaction (Data_Length), the maximum number of SubIntervals that can be used by the ISO link in ISOInterval, The number of data that needs to be transmitted on the ISO link in the ISO Interval, and the maximum number of ISO Intervals required to complete data interaction.
  • the time interval for scanning broadcast messages and the length of the time window respectively indicate how often the master device scans broadcast messages and how long each scan;
  • ISO Interval is a fixed length of time, also referred to as ISO interval or ISO length.
  • An ISO Interval can include multiple sub-intervals (Sub Interval), also referred to as sub-intervals or sub-lengths.
  • Different ISO links can occupy different numbers of Sub-Intervals in the ISO Interval.
  • an ISO link As an ISO event (ISO Event), correspondingly, a Sub Interval corresponds to a sub event (Sub Event); the maximum number of Sub Intervals that can be used by the ISO link in the ISO Interval is called the maximum number of sub events (Number Of Sub Event).
  • NSE The number of data that needs to be transmitted on the ISO link in the ISO Interval is called the burst number (Burst Number, BN); the maximum number of ISO Intervals required to complete the data exchange refers to the number of ISO Intervals that need to be included
  • FT flush timeout
  • the parameter information can be used for the master device to scan the broadcast message sent by the slave device and perform data interaction with the slave device in the following steps.
  • the host layer of the master device may send parameter information to the link layer of the master device, and the parameter information may be carried in, for example, a request command to create an ISO link (HCI_LE_Create_ISO_Command) ;
  • the link layer of the master device sends a response message (HCI_Command_Status_Event) to the host layer of the master device.
  • the link layer of the master device After the link layer of the master device receives the parameter information, it can scan the broadcast message sent by the link layer of the slave device based on the parameter information, and perform data interaction with the link layer of the slave device in the subsequent steps.
  • the slave device configures broadcast parameters.
  • the slave device configures the broadcast parameters and enters the broadcast state to send broadcast messages to the master device according to the broadcast parameters.
  • the host layer of the slave device may send broadcast parameters (HCI_LE_Set_ISO_Advertising_Parameters) to the link layer of the slave device;
  • the host layer sends the first response message (HCI_Command_Complete_Event).
  • the broadcast parameter includes, for example, at least one of the following information: time interval for sending broadcast messages, broadcast type (Advertising_Type), local address type (Own_Address_Type), peer address type (Peer_Address_Type), peer address (Peer_Address), local End address (Own_Address), channel used to send broadcast messages (Advertising_Channel_Map), filtering policy (Advertising_Filter_Policy), etc.
  • time interval for sending broadcast messages broadcast type (Advertising_Type), local address type (Own_Address_Type), peer address type (Peer_Address_Type), peer address (Peer_Address), local End address (Own_Address), channel used to send broadcast messages (Advertising_Channel_Map), filtering policy (Advertising_Filter_Policy), etc.
  • the time interval for sending the broadcast message may include a maximum broadcast time interval (Advertising_Interval_Max) and a minimum broadcast time interval (Advertising_Interval_Min).
  • This broadcast parameter is used to send broadcast messages from the device. After the link layer of the slave device receives the broadcast parameter sent by the host layer of the slave device, it can send a broadcast message based on the broadcast parameter.
  • the host layer of the slave device sends a broadcast enable message (HCI_LE_Set_ISO_Advertising_Enable) to the link layer of the slave device based on the first response message; in response to the broadcast enable message, the link layer of the slave device sends the host layer of the slave device Send the second response message (HCI_Command_Complete_Event).
  • HCI_LE_Set_ISO_Advertising_Enable a broadcast enable message
  • the broadcast enable message is used to enable the broadcast function of the slave device.
  • the broadcast function of the slave device is activated, and the slave device enters the broadcast state.
  • a broadcast message needs to be sent and scanned between the slave device that enters the broadcast state and the master device that enters the initiation state to enter the ISO state.
  • the slave device sends a broadcast message (ADV_ISO_IND) to the master device according to the broadcast parameter.
  • ADV_ISO_IND a broadcast message
  • the master device scans the broadcast message from the slave device according to the parameter information in 101.
  • the slave device sends a broadcast message
  • the master device scans the broadcast message sent by the slave device.
  • the broadcast message is used to establish an ISO link between the master device and the slave device. If the master device scans a broadcast message from the slave device for establishing an ISO link, the master device executes 105.
  • the master device sends an indication message (INIT_ISO_IND) to the slave device.
  • the slave device receives the instruction message sent by the master device.
  • the master device can scan broadcast messages sent by multiple devices, but only when the broadcast message sent by the slave device is scanned, it will reply the instruction message to the slave device.
  • the indication message carries time information used for data exchange between the master device and the slave device.
  • the time information includes, for example, information such as a time anchor point used for data exchange, and the length of time the ISO link occupies in each ISO Interval (ISOduration).
  • the time anchor point of the first data interaction can be determined based on the ISO Interval, and the master device can use a timestamp that can be divisible by the ISO Interval as the time anchor point for data interaction between the master device and the slave device. For example, the time when the system is started is 0, and the ISO Interval is assumed to be 100. Then, if the time at which the master device calculates the time anchor point is 65, the obtained time of the time anchor point should be 100. If the master device calculates the time anchor point If the time is 155, then the time of the anchor point should be 200.
  • the time anchor point of the second data interaction may be determined based on the time anchor point of the first data interaction and ISOInterval.
  • the header of the broadcast message and the indication message may carry a specific PDU type identifier to indicate that the broadcast message and the indication message are used to establish an ISO link using the method of the embodiment of the present application.
  • the first 4 bits in the header of the broadcast message and the indication message may be 1010b.
  • the master device After the master device sends the instruction message to the slave device, it enters the ISO master state (ISO-Master state), and the slave device enters the ISO slave state (ISO-Slave state) after receiving the instruction message.
  • ISO-Master state After the master device sends the instruction message to the slave device, it enters the ISO master state (ISO-Master state), and the slave device enters the ISO slave state (ISO-Slave state) after receiving the instruction message.
  • the master device and the slave device can exchange data with each other based on the time information, that is, execute 107 and 108.
  • the master device exchanges data with the slave device based on the time information.
  • the slave device performs data interaction with the master device based on the time information.
  • the master device and the slave device can follow the time relationship shown in FIG. 3, for example, to exchange ISO protocol data units (Protocol Data Unit, PDU).
  • ISO protocol data units Protocol Data Unit, PDU
  • Figure 3 shows two ISO intervals (ISOInterval).
  • the time anchor point is the start time of the ISO interval.
  • the time anchor point may be determined based on the moment when the master device sends the indication message in 105.
  • the first time anchor point may be the moment when the master device sends the indication message plus a preset time offset (Win Offset) owned.
  • Win Offset preset time offset
  • NSE 2 sub-intervals
  • Sub Interval sub-intervals
  • M ⁇ S means that the master device sends one piece of data to the slave device
  • S ⁇ M means that the slave device sends one piece of data to the master device.
  • a data exchange is completed between the master device and the slave device.
  • BN 1 which means that the number of new data to be transmitted within an ISO Interval is 1.
  • BN counts the master device and the slave device separately, that is, within an ISO Interval, the master device needs to send 1 data to the slave device, and the slave device needs to send 1 data to the master device.
  • Inter Frame Space Between adjacent M ⁇ S and S ⁇ M, an interval of an inter-frame space (Inter Frame Space, IFS) length is required. Between the end time of the data interaction in each SubInterval and the start time of the data interaction in the next SubInterval, there needs to be at least one minimum sub-event space (TMSS) length.
  • TMSS minimum sub-event space
  • the number of retransmissions of each data has an upper limit, that is, the number of retransmissions (Retransmission Number, RTN) shown in FIG. 3.
  • RTN 1 means that data can be retransmitted at most once. If the data transmission is successful or the number of data retransmissions reaches RTN, the transmission of the old data is stopped, and the transmission of the next new data is performed.
  • the master device sends a piece of data to the slave device in sub-interval 1 of ISO interval 1, that is, M ⁇ S shown in sub-interval 1. If the transmission fails, then The master device can re-send the same data to the slave device in sub-interval 2 of ISO interval 1. But if the retransmission fails, the master device does not continue to send the same data to the slave device. Of course, if the master device transmits successfully in the ISO interval 1, it does not need to retransmit the data in the sub-interval 2.
  • the length of time the ISO link occupies in the ISO Interval that is, the duration of the ISO link, as shown in FIG. 3, it includes the duration of sub-interval 1 and sub-interval 2.
  • the master device determines that the establishment of the ISO link is completed.
  • the slave device determines that the establishment of the ISO link is completed.
  • the preset number may be 6, for example. That is to say, within 6 ISO Intervals, one data exchange is successful, that is, it is considered that the ISO link is established successfully.
  • the link layer of the master device sends an establishment completion command to the host layer of the master device to indicate that the ISO link is successfully established.
  • the link layer of the slave device sends an establishment completion command to the host layer of the slave device to indicate that the ISO link is successfully established.
  • the ISO link can be used between the master device and the slave device for normal data exchange and link maintenance.
  • the master device scans the broadcast message sent by the slave device, and when the broadcast message is scanned, sends an indication message to the slave device, which carries the information for the Time information for data exchange between the master device and the slave device. After that, the master device and the slave device exchange data based on the time information, and complete the establishment of the ISO link after the interaction is successful.
  • the master device can directly enter the ISO-Master state from the initiating state, and the slave device can directly enter the ISO-Slave state from the broadcast state.
  • the establishment of the ISO link does not need to rely on other reference links, which makes the establishment of the ISO link more flexible and efficient.
  • bandwidth utilization is also improved.
  • the master device can establish ISO links with multiple slave devices. For example, the master device establishes an ISO link 1 with the slave device A, and establishes an ISO link 2 with the slave device B. Both the ISO link 1 and the ISO link 2 can be established through the methods shown in Figures 1 to 3.
  • the slave device A and the slave device B are the left earphone and the right earphone in the Bluetooth headset, respectively. Then the main device and the left earphone and the right earphone need to establish two ISO links respectively.
  • FIG 4 shows the time diagram for establishing two ISO links.
  • ISO link 1 is established between the master device and slave device A
  • ISO link 2 is established between the master device and slave device B.
  • ISO interval 1 Take ISO interval 1 as an example.
  • NSE 1, which means that ISO link 1 occupies a maximum of 1 SubInterval in ISO interval 1, and ISO link 2 occupies a maximum of 1 SubInterval in ISO interval 1.
  • BN 1, which means that in the ISO interval 1, the master device needs to send a piece of data to the slave device A and the slave device A needs to send a piece of data to the master device within the length of time occupied by the ISO link 1; in the occupancy of the ISO link 2 Within the period of time, the master device needs to send a piece of data to the slave device B, and the slave device B needs to send a piece of data to the master device.
  • FT 1
  • the data sent from device A to the master device must be transmitted within 1 ISO Interval
  • the data sent from device B to the master device must be transmitted within 1 ISO Interval.
  • RTN 0, which means that each data can only be transmitted once, but cannot be retransmitted.
  • the time anchor point corresponding to the ISO link 2 establishment process can be determined according to the time anchor point corresponding to the ISO link 1 establishment process and the duration occupied by the ISO link 1 (duration of the ISO link 1).
  • the distance between the position occupied by ISO link 1 in ISO interval 1 and the position occupied by ISO link 1 in ISO interval 2 is one ISO Interval.
  • the position occupied by ISO link 2 in ISO interval 1 and the position occupied by ISO link 2 in ISO interval 2 are also a length of ISO Interval.
  • the master device can establish multiple ISO links in sequence with multiple slave devices.
  • the establishment of each ISO link does not need to rely on other reference links, so it is more flexible and efficient, and improves BLE bandwidth utilization.
  • the slave device A and the slave device B After the slave device A and the slave device B receive the data sent by the master device through the ISO link 1 and the ISO link 2, respectively, they buffer the data and need to start processing the received data at a certain moment.
  • the size of the sequence numbers of the above-mentioned processes does not mean the order of execution.
  • the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of this application. .
  • Fig. 5 is a schematic block diagram of a BLE device 500 according to an embodiment of the present application.
  • the BLE device 500 is the master device. As shown in FIG. 5, the BLE device 500 includes:
  • the processing unit 510 is configured to configure parameter information, where the parameter information is used to establish an ISO link between the master device and the slave device;
  • the transceiver unit 520 is configured to scan the broadcast message from the slave device according to the parameter information, and the broadcast message is used to establish the ISO link;
  • the transceiver unit 520 is further configured to, if the broadcast message is scanned, send an indication message to the slave device, where the indication message carries time information for data exchange between the master device and the slave device;
  • the transceiver unit 520 is further configured to perform data interaction with the slave device based on the time information
  • the processing unit 510 is further configured to determine that the establishment of the ISO link is completed when at least one data exchange is successful within a preset number of ISO intervals.
  • the master device scans the broadcast message sent by the slave device, and when the broadcast message is scanned, sends an indication message to the slave device, which carries a message for the master device and Time information for data exchange between the slave devices. After that, the master device and the slave device exchange data based on the time information, and complete the establishment of the ISO link after the interaction is successful. It can be seen that with this method, the establishment of the ISO link does not need to rely on the ACL link, so that the establishment of the ISO link is more flexible and efficient, and the BLE bandwidth utilization rate is improved.
  • the processing unit 510 is specifically configured to: control the transceiver unit 520 to send the parameter information at the host layer of the master device to the link layer of the master device; in response to the parameter information, control the transceiver unit 520 at The link layer sends a response message to the host layer.
  • the time information includes: a time anchor point for performing the data exchange, and the length of time occupied by the ISO link in each ISO interval.
  • the preset number is 6.
  • the parameter information includes at least one of the following information: the time interval for scanning the broadcast message, the length of the time window for scanning the broadcast message, filtering strategy, peer address type, and The address of the slave device, the type of local address, the ISO interval, the sub-interval in the ISO interval, the data length during the data exchange, and the number of sub-intervals that can be used by the ISO link in the ISO interval The maximum number, the number of data to be transmitted on the ISO link within the ISO interval, and the maximum number of ISO intervals required to complete the data interaction.
  • the BLE device 500 can perform corresponding operations performed by the master device in the foregoing method embodiments, and for brevity, details are not described herein again.
  • Fig. 6 is a schematic block diagram of a BLE device 600 according to an embodiment of the present application.
  • the BLE device 600 is a slave device. As shown in FIG. 6, the BLE device 600 includes a transceiving unit 620 and a processing unit 610.
  • the processing unit 610 is configured to: configure broadcast parameters
  • the transceiver unit 620 is configured to: send a broadcast message according to the broadcast parameter, the broadcast message is used to establish an ISO link between the slave device and the master device; receive an instruction message sent by the master device based on the broadcast message, The instruction message carries time information used for data interaction between the master device and the slave device; based on the time information, data interaction with the master device;
  • the processing unit 610 is further configured to determine that the establishment of the ISO link is completed when at least one data exchange is successful within a preset number of ISO intervals.
  • the master device scans the broadcast message sent by the slave device, and when the broadcast message is scanned, sends an indication message to the slave device, which carries a message for the master device and Time information for data exchange between the slave devices. After that, the master device and the slave device exchange data based on the time information, and complete the establishment of the ISO link after the interaction is successful. It can be seen that with this method, the establishment of the ISO link does not need to rely on the ACL link, so that the establishment of the ISO link is more flexible and efficient, and the BLE bandwidth utilization rate is improved.
  • the transceiver unit 620 is specifically configured to: send broadcast parameters at the host layer of the slave device to the link layer of the slave device, where the broadcast parameters are used by the slave device to send the broadcast message; in response to For the broadcast parameters, send a first response message to the link layer at the host layer; send a broadcast enable message to the link layer at the host layer based on the response message; send a broadcast enable message to the link layer at the host layer; Layer, start the broadcast function according to the broadcast enable message; in response to the broadcast enable message, send a second response message to the host layer at the link layer.
  • the time information includes: a time anchor point for performing the data exchange, and the length of time occupied by the ISO link in each ISO interval.
  • the preset number is 6.
  • the broadcast parameters include at least one of the following information: the time interval for sending the broadcast message, the broadcast type, the local address type, the peer address type, the address of the slave device, and the address used to send the broadcast message.
  • the channel and filtering strategy of the broadcast message includes at least one of the following information: the time interval for sending the broadcast message, the broadcast type, the local address type, the peer address type, the address of the slave device, and the address used to send the broadcast message.
  • the BLE device 600 can perform the corresponding operations performed by the slave device in the foregoing method embodiments, which are not repeated here for brevity.
  • FIG. 7 is a schematic structural diagram of a BLE chip 700 according to an embodiment of the present application.
  • the BLE chip 700 shown in FIG. 7 includes a processor 710, a memory 720, and a transceiver 730.
  • the processor 710 may call and run a computer program from the memory 720 to implement the method in the embodiment of the present application.
  • the processor 710 may control the sending and receiving of data between the transceiver 730 and other BLE devices or BLE chips.
  • the transceiver 730 may include an input interface 731 and an output interface 732.
  • the processor 710 may control the input interface 731 and the output interface 732 to communicate with other BLE devices or BLE chips, thereby obtaining information and data of other BLE devices or BLE chips, or outputting information or data to other BLE devices or BLE chips.
  • the BLE chip 700 may specifically be the master device in the embodiment of the present application, and the BLE chip 700 may implement the corresponding processes implemented by the master device in the various methods of the embodiments of the present application. For brevity, details are not described herein again.
  • the BLE chip 700 may specifically be the slave device in the embodiment of the present application, and the BLE chip 700 may implement the corresponding processes implemented by the slave device in the various methods of the embodiments of the present application. For the sake of brevity, details are not described herein again.
  • the above-mentioned processor may be an integrated circuit chip with signal processing capability.
  • the steps of the foregoing method embodiments can be completed by hardware integrated logic circuits in the processor or instructions in the form of software.
  • the above-mentioned processor may be a general-purpose processor, a digital signal processor (Digital Signal Processor, DSP), an application specific integrated circuit (ASIC), a ready-made programmable gate array (Field Programmable Gate Array, FPGA) or other Programming logic devices, discrete gates or transistor logic devices, discrete hardware components.
  • DSP Digital Signal Processor
  • ASIC application specific integrated circuit
  • FPGA ready-made programmable gate array
  • the methods, steps, and logical block diagrams disclosed in the embodiments of the present application can be implemented or executed.
  • the general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like.
  • the steps of the method disclosed in the embodiments of the present application can be directly embodied as being executed and completed by a hardware decoding processor, or executed and completed by a combination of hardware and software modules in the decoding processor.
  • the software module can be located in a mature storage medium in the field, such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, registers.
  • the storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.
  • the aforementioned memory may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory.
  • the non-volatile memory can be read-only memory (Read-Only Memory, ROM), programmable read-only memory (Programmable ROM, PROM), erasable programmable read-only memory (Erasable PROM, EPROM), and electrically available Erase programmable read-only memory (Electrically EPROM, EEPROM) or flash memory.
  • the volatile memory may be random access memory (Random Access Memory, RAM), which is used as an external cache.
  • RAM static random access memory
  • DRAM dynamic random access memory
  • DRAM synchronous dynamic random access memory
  • DDR SDRAM Double Data Rate Synchronous Dynamic Random Access Memory
  • Enhanced SDRAM, ESDRAM Enhanced Synchronous Dynamic Random Access Memory
  • Synchronous Link Dynamic Random Access Memory Synchronous Link Dynamic Random Access Memory
  • DR RAM Direct Rambus RAM
  • the embodiment of the present application also provides a computer-readable storage medium for storing computer programs.
  • the computer-readable storage medium can be applied to the BLE device in the embodiment of the present application, and the computer program causes the computer to execute the corresponding process implemented by the master device or the slave device in each method of the embodiment of the present application. .
  • the embodiments of the present application also provide a computer program product, including computer program instructions.
  • the computer program product can be applied to the BLE device in the embodiment of the present application, and the computer program instructions cause the computer to execute the corresponding process implemented by the master device or the slave device in each method of the embodiment of the present application. Go into details.
  • system and “network” in the embodiments of the present invention are often used interchangeably herein.
  • the term “and/or” in this article is only an association relationship describing the associated objects, which means that there can be three relationships, for example, A and/or B, which can mean: A alone exists, A and B exist at the same time, exist alone B these three situations.
  • the character "/" in this text generally indicates that the associated objects before and after are in an "or” relationship.
  • B corresponding (corresponding) to A means that B is associated with A, and B can be determined according to A.
  • determining B based on A does not mean that B is determined only based on A, and B can also be determined based on A and/or other information.

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Abstract

本申请提供一种建立ISO链路的方法，所述方法用于在两个低功耗蓝牙BLE设备之间建立ISO链路，能够更灵活地建立ISO链路。所述方法包括：所述两个BLE设备中的主设备配置参数信息，所述参数信息用于所述主设备与所述两个BLE设备中的从设备之间建立ISO链路；所述主设备根据所述参数信息，扫描来自所述从设备的广播消息，所述广播消息用于建立所述ISO链路；若扫描到所述广播消息，所述主设备向所述从设备发送指示消息，所述指示消息中携带用于所述主设备与所述从设备之间进行数据交互的时间信息；所述主设备基于所述时间信息，与从设备之间进行数据交互；若在预设数量的ISO间隔内有至少一次数据交互成功，所述主设备确定所述ISO链路建立完成。

Description

建立ISO链路的方法和BLE设备 技术领域
本申请实施例涉及信息技术领域，并且更具体地，涉及一种建立ISO链路的方法和BLE设备。
背景技术
低功耗蓝牙(Bluetooth Low Energy，BLE)设备之间建立同步(Isochronous，ISO)链路时，需要先建立异步无连接(Asynchronous Connectionless，ACL)链路，并在ACL链路的基础上建立ISO链路。因此，ISO链路和ACL链路之间是绑定的，ISO链路的建立需要依赖于ACL链路。因此，如何更灵活地建立ISO链路成为亟待解决的问题。
发明内容
本申请实施例提供一种建立ISO链路的方法和BLE设备，能够更灵活地建立ISO链路。
第一方面，提供了一种建立ISO链路的方法，该方法用于在两个BLE设备之间建立ISO链路，该方法包括：所述两个BLE设备中的主设备配置参数信息，所述参数信息用于所述主设备与所述两个BLE设备中的从设备之间建立ISO链路；所述主设备根据所述参数信息，扫描来自所述从设备的广播消息，所述广播消息用于建立所述ISO链路；若扫描到所述广播消息，所述主设备向所述从设备发送指示消息，所述指示消息中携带用于所述主设备与所述从设备之间进行数据交互的时间信息；所述主设备基于所述时间信息，与从设备之间进行数据交互；若在预设数量的ISO间隔内有至少一次数据交互成功，所述主设备确定所述ISO链路建立完成。
在一种可能的实现方式中，所述两个BLE设备中的主设备配置参数信息，包括：所述主设备的主机层向所述主设备的链路层发送所述参数信息；响应于所述参数信息，所述链路层向所述主机层发送应答消息。
在一种可能的实现方式中，所述时间信息包括：用于进行所述数据交互的时间锚点，以及所述ISO链路在每个所述ISO间隔内占用的时长。
在一种可能的实现方式中，所述预设数量为6。
在一种可能的实现方式中，所述参数信息中包括以下信息中的至少一种：用于扫描所述广播消息的时间间隔、用于扫描所述广播消息的时间窗口长度、过滤策略、对端地址类型、所述从设备的地址、本端地址类型、所述ISO间隔、所述ISO间隔中的子间隔、所述数据交互时的数据长度、所述ISO间隔内所述ISO链路可使用的子间隔的最大数量、所述ISO间隔内所述ISO链路上需要传输的数据的数量、完成所述数据交互所要求的ISO间隔的最大数量。
第二方面，提供了一种建立ISO链路的方法，该方法用于在两个BLE设备之间建立ISO链路，该方法包括：所述两个BLE设备中的从设备配置广播参数；所述从设备根据所述广播参数发送广播消息，所述广播消息用于建立所述ISO链路；所述从设备接收所述主设备基于所述广播消息发送的指示消息，所述指示消息中携带用于所述主设备与所述从设备之间进行数据交互的时间信息；所述从设备基于所述时间信息，与所述主设备之间进行数据交互；若在预设数量的ISO间隔内有至少一次数据交互成功，所述从设备确定所述ISO链路建立完成。
在一种可能的实现方式中，所述从设备进入广播态，包括：所述从设备的主机层向所述从设备的链路层发送广播参数，所述广播参数用于所述从设备发送所述广播消息；响应于所述广播参数，所述链路层向所述主机层发送第一应答消息；所述主机层基于所述第一应答消息，向所述链路层发送广播使能消息；所述链路层根据所述广播使能消息，启动广播功能；响应于所述广播使能消息，所述链路层向所述主机层发送第二应答消息。
在一种可能的实现方式中，所述时间信息包括：用于进行所述数据交互的时间锚点，以及所述ISO链路在每个所述ISO间隔内占用的时长。
在一种可能的实现方式中，所述预设数量为6。
在一种可能的实现方式中，所述广播参数中包括以下信息中的至少一种：
发送所述广播消息的时间间隔、广播类型、本端地址类型、对端地址类型、所述从设备的地址、用于发送所述广播消息的信道、过滤策略。
第三方面，提供了一种BLE设备，包括用于执行第一方面或第一方面的任意可能的实现方式中的方法的功能模块。
第四方面，提供了一种BLE设备，包括用于执行第二方面或第二方面的任意可能的实现方式中的方法的功能模块。
第五方面，提供了一种BLE芯片，所述BLE芯片包括处理器和存储器，所述存储器用于存储计算机程序，所述处理器用于调用并运行所述存储器中存储的计算机程序，以执行第一方面或第一方面的任意可能的实现方式中的方法。
第六方面，提供了一种BLE芯片，所述BLE芯片包括处理器和存储器，所述存储器用于存储计算机程序，所述处理器用于调用并运行所述存储器中存储的计算机程序，以执行第二方面或第二方面的任意可能的实现方式中的方法。
第七方面，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用于存储计算机程序。其中，当所述计算机程序被处理器执行时，使得所述处理器执行第一方面或第一方面的任意可能的实现方式中的方法。
第八方面，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用于存储计算机程序。其中，当所述计算机程序被处理器执行时，使得所述处理器执行第二方面或第二方面的任意可能的实现方式中的方法。
第九方面，提供了一种计算机程序产品，包括计算机程序指令，该计算机程序指令使得计算机执行上述第一方面或第一方面的任意可能的实现方式中的方法。
第十方面，提供了一种计算机程序产品，包括计算机程序指令，该计算机程序指令使得计算机执行上述第二方面或第二方面的任意可能的实现方式中的方法。
基于上述技术方案，主设备和从设备分别进入发起态和广播态后，主设备扫描从设备发送的广播消息，并在扫描到该广播消息时向从设备发送指示消息，其中携带用于所述主设备与所述从设备之间进行数据交互的时间信息。之后，主设备与从设备基于该时间信息，进行数据交互，并在交互成功后完成ISO链路的建立。可见，采用该方法，ISO链路的建立不需要依赖ACL链路，从而使得ISO链路的建立更加灵活和高效，并且提高了BLE带宽利用率。
附图说明
图1是本申请实施例的建立ISO链路的方法的流程交互图。
图2基于图1所示的方法的一种可能的实现方式的流程交互图。
图3是主设备和从设备之间进行数据交互所遵循的时间关系的示意图。
图4是两个ISO链路建立时所遵循的时间关系的示意图。
图5是本申请实施例的BLE设备的示意性框图。
图6是本申请实施例的BLE设备的示意性框图。
图7是本申请实施例的BLE芯片的示意性结构图。
具体实施方式
下面将结合附图，对本申请中的技术方案进行描述。
BLE设备之间在进行数据交互之前，需要建立合适的链路。其中，两个BLE设备之间的同步链路，即ISO链路用于传输二者之间的同步信息。ISO链路以确保数据送达的时效性为最高优先级，用于传输有时间限制的信息例如声音等。通常，ISO链路的建立需要依赖其他参考链路，例如ACL链路或者广播链路。这就导致ISO链路的建立不够灵活，而且较为复杂。
为此，本申请实施例提供了一种ISO链路建立的方法，可以不依赖于其他链路的建立，从而更灵活地建立ISO链路。
图1是本申请实施例的建立ISO链路的方法的流程交互图。该方法用于在两个BLE设备之间建立ISO链路，这两个BLE设备分别为主设备和从设备。对于每个BLE设备而言，其可以仅具有主设备的角色，或者仅具有从设备的角色，或者可以同时具备主设备和从设备的角色。当一个BLE设备同时具备主设备和从设备的角色时，在建立ISO链路前，例如可以由用户选择在这次ISO链路建立过程中该BLE设备作为主设备还是从设备。图1所示的方法由主设备(ISO-Master)和从设备(ISO-Slave)执行。主设备和从设备可以通过图1所示的方法建立ISO链路。主设备包括主机层(Host)和链路层，从设备也包括Host和链路层。如图1所示，该方法100包括以下步骤中的部分或全部。
在101中，主设备配置参数信息。
主设备配置该参数信息，以进入发起态。其中，所述参数信息用于主设备与从设备之间建立ISO链路。
该参数信息例如可以包括以下信息中的至少一种：
用于扫描广播消息的时间间隔(LE_Scan_Interval)、用于扫描广播消息的时间窗口长度(LE_Scan_Window)、过滤策略(Initiator_Filter_Policy)、 对端地址类型(Peer_Address_Type)、对端地址(Peer_Address)、本端地址类型(Own_Address_Type)、ISO时间间隔(ISO Interval)、ISO Interval内的子时间间隔(Sub Interval)长度、数据交互的数据长度(Data_Length)、ISOInterval内所述ISO链路可使用的Sub Interval的最大数量、ISO Interval内所述ISO链路上需要传输的数据的数量、完成数据交互所要求的ISO Interval的最大数量。
其中，用于扫描广播消息的时间间隔和时间窗口的长度，分别表示主设备多久扫描一次广播消息以及每次扫描多久；ISO时间间隔(ISO Interval)是固定的时间长度，也简称为ISO间隔或者ISO长度，一个ISO Interval内可以包括多个子时间间隔(Sub Interval)，也简称为子间隔或者子长度，不同ISO链路可以占用该ISO Interval内不同数量的Sub Interval，这里可以将一个ISO链路作为一个ISO事件(ISO Event)，相应地，一个Sub Interval对应一个子事件(Sub Event)；ISO Interval内该ISO链路可使用的Sub Interval的最大数量称为最大子事件数量(Number Of Sub Event，NSE)；ISO Interval内该ISO链路上需要传输的数据的数量称为突发数(Burst Number，BN)；完成数据交互所要求的ISO Interval的最大数量指需要在该数量的ISO Interval内将数据传输完毕，也称为刷新超时(Flush Timeout，FT)。
这些参数的具体含义在下文中会进行更详细的说明。
该参数信息可以用于主设备在下述步骤中扫描从设备发送的广播消息以及与从设备之间进行数据交互等。
可选地，如图2所示，在101中，主设备的主机层可以向主设备的链路层发送参数信息，该参数信息例如可以携带于创建ISO链路的请求命令中(HCI_LE_Create_ISO_Command)中；响应于该参数信息，主设备的链路层向主设备的主机层发送应答消息(HCI_Command_Status_Event)。
主设备的链路层接收到该参数信息后，就可以基于该参数信息扫描从设备的链路层发送的广播消息，并在后续步骤中与从设备的链路层之间进行数据交互。
在102中，从设备配置广播参数。
从设备配置广播参数，并进入广播态，以根据该广播参数向主设备发送广播消息。
可选地，如图2所示，在102中，从设备的主机层可以向从设备的链路 层发送广播参数(HCI_LE_Set_ISO_Advertising_Parameters)；响应于该广播参数，从设备的链路层向从设备的主机层发送第一应答消息(HCI_Command_Complete_Event)。
该广播参数例如包括以下信息中的至少一种：发送广播消息的时间间隔、广播类型(Advertising_Type)、本端地址类型(Own_Address_Type)、对端地址类型(Peer_Address_Type)、对端地址(Peer_Address)、本端地址(Own_Address)、用于发送广播消息的信道(Advertising_Channel_Map)、过滤策略(Advertising_Filter_Policy)等。
其中，发送广播消息的时间间隔可以包括最大广播时间间隔(Advertising_Interval_Max)和最小广播时间间隔(Advertising_Interval_Min)。
该广播参数用于从设备发送广播消息。从设备的链路层收到从设备的主机层发送的广播参数后，可以基于该广播参数发送广播消息。
进一步地，从设备的主机层基于第一应答消息，向从设备的链路层发送广播使能消息(HCI_LE_Set_ISO_Advertising_Enable)；响应于该广播使能消息，从设备的链路层向从设备的主机层发送第二应答消息(HCI_Command_Complete_Event)。
其中，该广播使能消息用于使能从设备的广播功能。至此，从设备的广播功能启动，从设备进入广播态。
之后，进入广播态的从设备与进入发起态的主设备之间需要进行广播消息的发送与扫描，以进入ISO态。
在103中，从设备根据该广播参数，向主设备发送广播消息(ADV_ISO_IND)。
在104中，主设备根据101中的该参数信息，扫描来自从设备的广播消息。
其中，在103和104中，从设备发送广播消息，主设备扫描从设备发送的广播消息。该广播消息用于主设备与从设备之间建立ISO链路。若主设备扫描到来自该从设备的用建立ISO链路的广播消息，则主设备执行105。
在105中，主设备向从设备发送指示消息(INIT_ISO_IND)。
在106中，从设备接收主设备发送的该指示消息。
应注意，主设备可以扫描多个设备发送的广播消息，但是仅在扫描到该从设备发送的广播消息时，向该从设备回复该指示消息。
其中，该指示消息中携带用于主设备与从设备之间进行数据交互的时间信息。
该时间信息例如包括用于进行数据交互的时间锚点、该ISO链路在每个ISO Interval内占用的时长(ISOduration)等信息。
其中，第一次数据交互的时间锚点可以基于ISO Interval确定，主设备可以将能够被ISO Interval整除的时间戳，作为主设备与从设备之间进行数据交互的时间锚点。例如，系统启动的时刻为0，ISO Interval假设为100，那么，如果主设备计算时间锚点的时刻为65，则得到的该时间锚点的时刻应为100，如果主设备计算时间锚点的时刻为155，那么得到的该时间锚点的时刻应为200。第二次数据交互的时间锚点可以基于第一次数据交互的时间锚点以及ISOInterval确定。
该广播消息和该指示消息的包头中可以携带特定的PDU类型标识，以表示该广播消息和该指示消息是用来采用本申请实施例的方法建立ISO链路的。例如，该广播消息和该指示消息的包头中的前4比特可以是1010b。
主设备向从设备发送该指示消息后，进入ISO主设备态(ISO-Master态)，从设备接收到该指示消息后，进入ISO从设备态(ISO-Slave态)。
之后，主设备和从设备可以基于该时间信息，进行彼此之间的数据交互，即执行107和108。
在107中，主设备基于该时间信息，与从设备之间进行数据交互。
在108中，从设备基于该时间信息，与主设备之间进行数据交互。
在进行数据交互时，主设备和从设备可以遵循例如图3所示的时间关系，进行ISO协议数据单元(Protocol Data Unit，PDU)的交换。
图3中示出了2个ISO间隔(ISOInterval)。如图3所示，时间锚点为ISO间隔的起始时刻。时间锚点可以是基于主设备在105中发送指示消息的时刻确定的，例如，第一个时间锚点可以是主设备发送该指示消息的时刻加上预设的时间偏移量(Win Offset)得到的。
在图3中，NSE＝2，表示每个ISO Interval内该ISO链路最多可以占用2个子间隔(Sub Interval)，如果数据传输完毕，Sub Interval可以提前终止。在每个Sub Interval内，主设备和从设备只能发送一次数据，M→S表示主设备向从设备发送一个数据，S→M表示从设备向主设备发送一个数据。在每个Sub Interval内，主设备和从设备之间完成一次数据交互。
BN＝1，表示在一个ISO Interval内需要传输的新数据的个数为1。BN针对主设备和从设备分别计数，也就是说，在一个ISO Interval内，主设备需要向从设备发送1个数据，从设备需要向主设备发送1个数据。
FT＝1，表示每个数据需要在1个ISO Interval内传输完成。
在相邻的M→S与S→M之间，需要间隔一个帧间空间(Inter Frame Space，IFS)的长度。每个Sub Interval内的数据交互结束时刻，至下一个Sub Interval内的数据交互开始时刻之间，需要间隔至少一个最小子事件空间(The Minimum Sub-event Space，TMSS)的长度。
每个数据的重传次数具有上限，即图3所示的重传次数(Retransmission Number，RTN)。RTN＝1表示数据最多允许重传一次。数据传输成功或者数据重传次数达到RTN，则停止旧数据的传输，而进行下一个新数据的传输。
以主设备在ISO间隔1内的数据传输为例，主设备在ISO间隔1的子间隔1内，向从设备发送一个数据，即子间隔1内所示的M→S，如果传输失败，则主设备可以在ISO间隔1的子间隔2内，重新向从设备发送相同数据。但是如果重传失败，则主设备不再继续向从设备发送相同数据。当然，如果主设备在ISO间隔1内传输成功，则不必在子间隔2内重传该数据。
该ISO链路在ISO Interval内占用的时长，即该ISO链路的持续时间(duration)，对于图3而言，其包括子间隔1和子间隔2的时长。
在109中，若在预设数量的ISO Interval内有至少一次数据交互成功，主设备确定所述ISO链路建立完成。
在110中，若在预设数量的ISO Interval内有至少一次数据交互成功，从设备确定所述ISO链路建立完成。
主设备和从设备如果在预设数量的ISO Interval内有至少一次数据交互成功，则认为该ISO链路建立成功。
该预设数量例如可以是6。也就是说，在6个ISO Interval内，有一次数据交互成功，即认为ISO链路建立成功。
此后，主设备和从设备之间可以进行正常的数据交互和链路维护，以实现各自的功能。
如图2所示，ISO链路建立成功后，主设备的链路层向主设备的主机层发送建立完成命令，以指示ISO链路建立成功。相应地，从设备的链路层向从设备的主机层发送建立完成命令，以指示ISO链路建立成功。
之后，主设备与从设备之间可以通过该ISO链路，正常地进行数据交互和链路维护。
该实施例中，主设备和从设备分别进入发起态和广播态后，主设备扫描从设备发送的广播消息，并在扫描到该广播消息时向从设备发送指示消息，其中携带用于所述主设备与所述从设备之间进行数据交互的时间信息。之后，主设备与从设备基于该时间信息，进行数据交互，并在交互成功后完成ISO链路的建立。
可见，主设备可以从发起态直接进入ISO-Master态，从设备可以从广播态直接进入ISO-Slave态。ISO链路的建立不需要依赖其他参考链路，从而使得ISO链路的建立更加灵活和高效。并且，由于不需要占用多余的带宽建立其他参考链路，因此还提高了带宽利用率。
上面描述了主设备与一个从设备之间建立ISO链路的方法。实际应用中，主设备可以与多个从设备之间分别建立ISO链路。例如，主设备与从设备A建立ISO链路1，并与从设备B建立ISO链路2。ISO链路1和ISO链路2都可以通过图1至图3所示的方法建立完成。
如果主设备是手机，从设备A和从设备B分别是蓝牙耳机中的左耳机和右耳机。那么主设备与左耳机和右耳机需要分别建立两个ISO链路。
图4所示是建立两个ISO链路的时间示意图。主设备与从设备A之间建立ISO链路1，主设备与从设备B之间建立ISO链路2。以ISO间隔1为例进行说明。
NSE＝1，表示ISO链路1在ISO间隔1内最多占用1个Sub Interval，ISO链路2在ISO间隔1内最多占用1个Sub Interval。
BN＝1，表示在ISO间隔1内，在ISO链路1占用的时长内，主设备需要向从设备A发送一个数据，从设备A需要向主设备发送一个数据；在ISO链路2的占用的时长内，主设备需要向从设备B发送一个数据，从设备B需要向主设备发送一个数据。
FT＝1，表示主设备向从设备A发送的数据必须在1个ISO Interval内传输完成，主设备向从设备B发送的数据必须在1个ISO Interval内传输完成。从设备A向主设备发送的数据必须在1个ISO Interval内传输完成，从设备B向主设备发送的数据必须在1个ISO Interval内传输完成。
RTN＝0，表示每个数据仅可以传输一次，而不能重传。
主设备通过上述图1所示的流程，与从设备A之间建立ISO链路1后，继续通过上述图1所示的流程，与从设备B之间建立ISO链路2。ISO链路2建立过程中对应的该时间锚点，可以根据ISO链路1建立过程中对应的该时间锚点、以及ISO链路1占用的时长(ISO链路1的duration)确定。
在图4中，ISO链路1在ISO间隔1中所占的位置，与ISO链路1在ISO间隔2中所占的位置之间，距离一个ISO Interval的长度。ISO链路2在ISO间隔1中所占的位置，与ISO链路2在ISO间隔2中所占的位置之间，也距离一个ISO Interval的长度。
通过上述方式，主设备可以与多个从设备之间依次建立多条ISO链路。每条ISO链路的建立不需要依赖其他参考链路，因此更加灵活和高效，并且提高了BLE带宽利用率。
从设备A和从设备B分别通过ISO链路1和ISO链路2接收到主设备发送的数据后，缓存该数据，并需要在某一时刻，同时开始对接收到的该数据进行处理。
在本申请实施例中，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本申请实施例的实施过程构成任何限定。
并且，在不冲突的前提下，本申请描述的各个实施例和/或各个实施例中的技术特征可以任意的相互组合，组合之后得到的技术方案也应落入本申请的保护范围。
上文中详细描述了根据本申请实施例的数据传输的方法，下面将结合图5至图7，描述根据本申请实施例的装置，方法实施例所描述的技术特征适用于以下装置实施例。
图5是根据本申请实施例的BLE设备500的示意性框图。BLE设备500为主设备。如图5所示，所述BLE设备500包括：
处理单元510，用于配置参数信息，所述参数信息用于所述主设备与从设备之间建立ISO链路；
收发单元520，用于根据所述参数信息，扫描来自所述从设备的广播消息，所述广播消息用于建立所述ISO链路；
收发单元520还用于，若扫描到所述广播消息，向所述从设备发送指示消息，所述指示消息中携带用于所述主设备与所述从设备之间进行数据交互 的时间信息；
收发单元520还用于，基于所述时间信息，与从设备之间进行数据交互；
处理单元510还用于，在预设数量的ISO间隔内有至少一次数据交互成功时，确定所述ISO链路建立完成。
因此，主设备和从设备分别进入发起态和广播态后，主设备扫描从设备发送的广播消息，并在扫描到该广播消息时向从设备发送指示消息，其中携带用于所述主设备与所述从设备之间进行数据交互的时间信息。之后，主设备与从设备基于该时间信息，进行数据交互，并在交互成功后完成ISO链路的建立。可见，采用该方法，ISO链路的建立不需要依赖ACL链路，从而使得ISO链路的建立更加灵活和高效，并且提高了BLE带宽利用率。
可选地，处理单元510具体用于：控制收发单元520在所述主设备的主机层向所述主设备的链路层发送所述参数信息；响应于所述参数信息，控制收发单元520在所述链路层向所述主机层发送应答消息。
可选地，所述时间信息包括：用于进行所述数据交互的时间锚点，以及所述ISO链路在每个所述ISO间隔内占用的时长。
可选地，所述预设数量为6。
可选地，所述参数信息中包括以下信息中的至少一种：用于扫描所述广播消息的时间间隔、用于扫描所述广播消息的时间窗口长度、过滤策略、对端地址类型、所述从设备的地址、本端地址类型、所述ISO间隔、所述ISO间隔中的子间隔、所述数据交互时的数据长度、所述ISO间隔内所述ISO链路可使用的子间隔的最大数量、所述ISO间隔内所述ISO链路上需要传输的数据的数量、完成所述数据交互所要求的ISO间隔的最大数量。
应理解，BLE设备500可以执行上述方法实施例中由主设备执行的相应操作，为了简洁，在此不再赘述。
图6是根据本申请实施例的BLE设备600的示意性框图。BLE设备600为从设备。如图6所示，BLE设备600包括收发单元620和处理单元610。
处理单元610用于：配置广播参数；
收发单元620用于：根据所述广播参数发送广播消息，所述广播消息用于所述从设备与主设备之间建立ISO链路；接收所述主设备基于所述广播消息发送的指示消息，所述指示消息中携带用于所述主设备与所述从设备之间进行数据交互的时间信息；基于所述时间信息，与所述主设备之间进行数据 交互；
处理单元610还用于：在预设数量的ISO间隔内有至少一次数据交互成功时，确定所述ISO链路建立完成。
因此，主设备和从设备分别进入发起态和广播态后，主设备扫描从设备发送的广播消息，并在扫描到该广播消息时向从设备发送指示消息，其中携带用于所述主设备与所述从设备之间进行数据交互的时间信息。之后，主设备与从设备基于该时间信息，进行数据交互，并在交互成功后完成ISO链路的建立。可见，采用该方法，ISO链路的建立不需要依赖ACL链路，从而使得ISO链路的建立更加灵活和高效，并且提高了BLE带宽利用率。
可选地，收发单元620具体用于：在所述从设备的主机层向所述从设备的链路层发送广播参数，所述广播参数用于所述从设备发送所述广播消息；响应于所述广播参数，在所述主机层向所述链路层发送第一应答消息；基于所述应答消息，在所述主机层向所述链路层发送广播使能消息；在所述链路层，根据所述广播使能消息启动广播功能；响应于所述广播使能消息，在所述链路层向所述主机层发送第二应答消息。
可选地，所述时间信息包括：用于进行所述数据交互的时间锚点，以及所述ISO链路在每个所述ISO间隔内占用的时长。
可选地，所述预设数量为6。
可选地，所述广播参数中包括以下信息中的至少一种：发送所述广播消息的时间间隔、广播类型、本端地址类型、对端地址类型、所述从设备的地址、用于发送所述广播消息的信道、过滤策略。
应理解，BLE设备600可以执行上述方法实施例中由从设备执行的相应操作，为了简洁，在此不再赘述。
图7是本申请实施例的一种BLE芯片700的示意性结构图。图7所示的BLE芯片700包括处理器710、存储器720、以及收发器730。其中，处理器710可以从存储器720中调用并运行计算机程序，以实现本申请实施例中的方法。处理器710可以控制收发器730与其他BLE设备或BLE芯片之间进行数据的发送和接收。
收发器730可以包括输入接口731和输出接口732。处理器710可以控制输入接口731和输出接口732与其他BLE设备或BLE芯片之间进行通信，从而获取其他BLE设备或BLE芯片的信息和数据，或者向其他BLE设备或 BLE芯片输出信息或数据。
可选地，BLE芯片700具体可为本申请实施例中的主设备，并且BLE芯片700可以实现本申请实施例的各个方法中由主设备实现的相应流程，为了简洁，在此不再赘述。
可选地，BLE芯片700具体可为本申请实施例中的从设备，并且BLE芯片700可以实现本申请实施例的各个方法中由从设备实现的相应流程，为了简洁，在此不再赘述。
上述的处理器可能是一种集成电路芯片，具有信号的处理能力。在实现过程中，上述方法实施例的各步骤可以通过处理器中的硬件的集成逻辑电路或者软件形式的指令完成。上述的处理器可以是通用处理器、数字信号处理器(Digital Signal Processor，DSP)、专用集成电路(Application Specific Integrated Circuit，ASIC)、现成可编程门阵列(Field Programmable Gate Array，FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件。可以实现或者执行本申请实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。结合本申请实施例所公开的方法的步骤可以直接体现为硬件译码处理器执行完成，或者用译码处理器中的硬件及软件模块组合执行完成。软件模块可以位于随机存储器，闪存、只读存储器，可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器，处理器读取存储器中的信息，结合其硬件完成上述方法的步骤。
上述的存储器可以是易失性存储器或非易失性存储器，或可包括易失性和非易失性存储器两者。其中，非易失性存储器可以是只读存储器(Read-Only Memory，ROM)、可编程只读存储器(Programmable ROM，PROM)、可擦除可编程只读存储器(Erasable PROM，EPROM)、电可擦除可编程只读存储器(Electrically EPROM，EEPROM)或闪存。易失性存储器可以是随机存取存储器(Random Access Memory，RAM)，其用作外部高速缓存。通过示例性但不是限制性说明，许多形式的RAM可用，例如静态随机存取存储器(Static RAM，SRAM)、动态随机存取存储器(Dynamic RAM，DRAM)、同步动态随机存取存储器(Synchronous DRAM，SDRAM)、双倍数据速率同步动态随机存取存储器(Double Data Rate SDRAM，DDR SDRAM)、增强型同步动态随机存取存储器(Enhanced SDRAM，ESDRAM)、 同步连接动态随机存取存储器(Synchlink DRAM，SLDRAM)和直接内存总线随机存取存储器(Direct Rambus RAM，DR RAM)。
本申请实施例还提供了一种计算机可读存储介质，用于存储计算机程序。该计算机可读存储介质可应用于本申请实施例中的BLE设备，并且该计算机程序使得计算机执行本申请实施例的各个方法中由主设备或者从设备实现的相应流程，为了简洁，不再赘述。
本申请实施例还提供了一种计算机程序产品，包括计算机程序指令。该计算机程序产品可应用于本申请实施例中的BLE设备，并且该计算机程序指令使得计算机执行本申请实施例的各个方法中由主设备或者从设备实现的相应流程，为了简洁，在此不再赘述。
本发明实施例中的术语“系统”和“网络”在本文中常被可互换使用。本文中术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本文中字符“/”，一般表示前后关联对象是一种“或”的关系。
在本发明实施例中，“与A相应(对应)的B”表示B与A相关联，根据A可以确定B。但还应理解，根据A确定B并不意味着仅仅根据A确定B，还可以根据A和/或其它信息确定B。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
本申请实施例中的具体的例子只是为了帮助本领域技术人员更好地理解本申请实施例，而非限制本申请实施例的范围，本领域技术人员可以在上述实施例的基础上进行各种改进和变形，而这些改进或者变形均落在本申请的保护范围内。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准。

Claims (24)

  1. 一种建立同步ISO链路的方法，其特征在于，所述方法用于在两个低功耗蓝牙BLE设备之间建立ISO链路，所述方法包括：
    所述两个BLE设备中的主设备配置参数信息，所述参数信息用于所述主设备与所述两个BLE设备中的从设备之间建立ISO链路；
    所述主设备根据所述参数信息，扫描来自所述从设备的广播消息，所述广播消息用于建立所述ISO链路；
    若扫描到所述广播消息，所述主设备向所述从设备发送指示消息，所述指示消息中携带用于所述主设备与所述从设备之间进行数据交互的时间信息；
    所述主设备基于所述时间信息，与从设备之间进行数据交互；
    若在预设数量的ISO间隔内有至少一次数据交互成功，所述主设备确定所述ISO链路建立完成。
  2. 根据权利要求1所述的方法，其特征在于，所述两个BLE设备中的主设备配置参数信息，包括：
    所述主设备的主机层向所述主设备的链路层发送所述参数信息；
    响应于所述参数信息，所述链路层向所述主机层发送应答消息。
  3. 根据权利要求1或2所述的方法，其特征在于，所述时间信息包括：用于进行所述数据交互的时间锚点，以及所述ISO链路在每个所述ISO间隔内占用的时长。
  4. 根据权利要求1至3中任一项所述的方法，其特征在于，所述预设数量为6。
  5. 根据权利要求1至4中任一项所述的方法，其特征在于，所述参数信息中包括以下信息中的至少一种：
    用于扫描所述广播消息的时间间隔、用于扫描所述广播消息的时间窗口长度、过滤策略、对端地址类型、本端地址类型、所述从设备的地址、所述ISO间隔、所述ISO间隔中的子间隔、所述数据交互时的数据长度、所述ISO间隔内所述ISO链路可使用的子间隔的最大数量、所述ISO间隔内所述ISO链路上需要传输的数据的数量、完成所述数据交互所要求的ISO间隔的最大数量。
  6. 一种建立同步ISO链路的方法，其特征在于，所述方法用于在两个 低功耗蓝牙BLE设备之间建立ISO链路，所述方法包括：
    所述两个BLE设备中的从设备配置广播参数；
    所述从设备根据所述广播参数发送广播消息，所述广播消息用于所述从设备与所述两个BLE设备中的主设备之间建立所述ISO链路；
    所述从设备接收所述主设备基于所述广播消息发送的指示消息，所述指示消息中携带用于所述主设备与所述从设备之间进行数据交互的时间信息；
    所述从设备基于所述时间信息，与所述主设备之间进行数据交互；
    若在预设数量的ISO间隔内有至少一次数据交互成功，所述从设备确定所述ISO链路建立完成。
  7. 根据权利要求6所述的方法，其特征在于，所述从设备配置广播参数，包括：
    所述从设备的主机层向所述从设备的链路层发送广播参数，所述广播参数用于所述从设备发送所述广播消息；
    响应于所述广播参数，所述链路层向所述主机层发送第一应答消息；
    所述主机层基于所述第一应答消息，向所述链路层发送广播使能消息；
    所述链路层根据所述广播使能消息，启动广播功能；
    响应于所述广播使能消息，所述链路层向所述主机层发送第二应答消息。
  8. 根据权利要求6或7所述的方法，其特征在于，所述时间信息包括：用于进行所述数据交互的时间锚点，以及所述ISO链路在每个所述ISO间隔内占用的时长。
  9. 根据权利要求6至8中任一项所述的方法，其特征在于，所述预设数量为6。
  10. 根据权利要求6至9中任一项所述的方法，其特征在于，所述广播参数中包括以下信息中的至少一种：
    发送所述广播消息的时间间隔、广播类型、本端地址类型、对端地址类型、所述从设备的地址、用于发送所述广播消息的信道、过滤策略。
  11. 一种低功耗蓝牙BLE设备，其特征在于，所述BLE设备为主设备，所述BLE设备包括：
    处理单元，用于配置参数信息，所述参数信息用于所述主设备与从设备之间建立ISO链路；
    收发单元，用于根据所述参数信息，扫描来自所述从设备的广播消息， 所述广播消息用于建立ISO链路；
    所述收发单元还用于，若扫描到所述广播消息，向所述从设备发送指示消息，所述指示消息中携带用于所述主设备与所述从设备之间进行数据交互的时间信息；
    所述收发单元还用于，基于所述时间信息，与从设备之间进行数据交互；
    所述处理单元还用于，在预设数量的ISO间隔内有至少一次数据交互成功时，确定所述ISO链路建立完成。
  12. 根据权利要求11所述的BLE设备，其特征在于，所述处理单元具体用于：
    控制所述收发单元在所述主设备的主机层向所述主设备的链路层发送所述参数信息；
    响应于所述参数信息，控制所述收发单元在所述链路层向所述主机层发送应答消息。
  13. 根据权利要求11或12所述的BLE设备，其特征在于，所述时间信息包括：用于进行所述数据交互的时间锚点，以及所述ISO链路在每个所述ISO间隔内占用的时长。
  14. 根据权利要求11至13中任一项所述的BLE设备，其特征在于，所述预设数量为6。
  15. 根据权利要求11至14中任一项所述的BLE设备，其特征在于，所述参数信息中包括以下信息中的至少一种：
    用于扫描所述广播消息的时间间隔、用于扫描所述广播消息的时间窗口长度、过滤策略、对端地址类型、所述从设备的地址、本端地址类型、所述ISO间隔、所述ISO间隔中的子间隔、所述数据交互时的数据长度、所述ISO间隔内所述ISO链路可使用的子间隔的最大数量、所述ISO间隔内所述ISO链路上需要传输的数据的数量、完成所述数据交互所要求的ISO间隔的最大数量。
  16. 一种低功耗蓝牙BLE设备，其特征在于，所述BLE设备为从设备，所述BLE设备包括：
    处理单元，用于配置广播参数；
    收发单元，用于根据所述广播参数发送广播消息，所述广播消息用于所述从设备与主设备之间建立ISO链路；
    所述收发单元还用于，接收所述主设备基于所述广播消息发送的指示消息，所述指示消息中携带用于所述主设备与所述从设备之间进行数据交互的时间信息；
    所述收发单元还用于，基于所述时间信息，与所述主设备之间进行数据交互；
    所述处理单元还用于，在预设数量的ISO间隔内有至少一次数据交互成功时，确定所述ISO链路建立完成。
  17. 根据权利要求16所述的BLE设备，其特征在于，所述收发单元具体用于：
    在所述从设备的主机层向所述从设备的链路层发送广播参数，所述广播参数用于所述从设备发送所述广播消息；
    响应于所述广播参数，在所述主机层向所述链路层发送第一应答消息；
    基于所述应答消息，在所述主机层向所述链路层发送广播使能消息；
    在所述链路层，根据所述广播使能消息启动广播功能；
    响应于所述广播使能消息，在所述链路层向所述主机层发送第二应答消息。
  18. 根据权利要求16或17所述的BLE设备，其特征在于，所述时间信息包括：用于进行所述数据交互的时间锚点，以及所述ISO链路在每个所述ISO间隔内占用的时长。
  19. 根据权利要求16至18中任一项所述的BLE设备，其特征在于，所述预设数量为6。
  20. 根据权利要求16至19中任一项所述的BLE设备，其特征在于，所述广播参数中包括以下信息中的至少一种：
    发送所述广播消息的时间间隔、广播类型、本端地址类型、对端地址类型、所述从设备的地址、用于发送所述广播消息的信道、过滤策略。
  21. 一种低功耗蓝牙BLE芯片，其特征在于，包括处理器和存储器，所述存储器用于存储计算机程序，所述处理器用于调用并运行所述存储器中存储的计算机程序，以执行权利要求1至5中任一项所述的方法。
  22. 一种低功耗蓝牙BLE芯片，其特征在于，包括处理器和存储器，所述存储器用于存储计算机程序，所述处理器用于调用并运行所述存储器中存储的计算机程序，以执行权利要求6至10中任一项所述的方法。
  23. 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用于存储计算机程序，其中，当所述计算机程序被处理器执行时，使得所述处理器执行权利要求1至5中任一项所述的方法。
  24. 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用于存储计算机程序，其中，当所述计算机程序被处理器执行时，使得所述处理器执行权利要求6至10中任一项所述的方法。
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