WO2023074929A1 - 무선 이어버드 시스템 및 그의 동작 방법 - Google Patents
무선 이어버드 시스템 및 그의 동작 방법 Download PDFInfo
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- WO2023074929A1 WO2023074929A1 PCT/KR2021/015186 KR2021015186W WO2023074929A1 WO 2023074929 A1 WO2023074929 A1 WO 2023074929A1 KR 2021015186 W KR2021015186 W KR 2021015186W WO 2023074929 A1 WO2023074929 A1 WO 2023074929A1
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- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Definitions
- the present disclosure relates to a wireless earbud system and a method of operating the same. More specifically, it relates to a data transfer method in a wireless earbud system.
- TWS Truste Wireless Stereo
- a wireless earbud system is composed of a source device such as a smart phone, and at least one earbud that receives a sound source from the source device.
- earbuds are generally composed of two bars that are preferably worn on the left and right sides, one of which is a master earbud that receives sound directly from the source device, and the other is a slave earbud that receives sound from the source device. It can operate in a way of snooping the sound source received by the master earbud.
- An object of the present disclosure is to provide a wireless earbud system and method of operating the wireless earbud system that minimizes the occurrence frequency and delay time of data relay between earbuds and minimizes battery consumption.
- An object of the present disclosure is to provide a wireless earbud system and a method of operating the same, in which a separate packet is defined so that the master earbud can determine data for which snooping has failed in the slave earbud.
- the master earbud can perform data relay by selectively transmitting only data for which snooping has failed in the slave earbud.
- a wireless earbud system includes a source device, a first sink device that receives audio data from the source device, and a second sink device that snoops audio data transmitted from the source device.
- the device may transmit a relay packet to the second sink device to perform a data relay operation when there is data for which snooping has failed in the second sink device.
- a control link for transmitting and receiving a relay packet may be formed between the first sink device and the second sink device.
- the first sink device transmits a start control packet including reception status information of the ACL data received from the source device to the second sink device, and transmits the reception status information of the ACL data snooped by the second sink device from the second sink device.
- a reply control packet including
- the first sink device may determine whether a data relay operation is necessary by comparing the ACL data received from the source device with the ACL data received by the second sink device transmitted through the reply control packet.
- the first sink device may transmit, to the second sink device, a relay packet carrying data for which snooping has failed by the second sink device in the ACL data buffer.
- the first sink device may transmit an end packet to the second sink device when a data relay operation is not required.
- the first sink device may transmit an end packet to the second sink device.
- the relay packet may include a payload received by the first sink device from the source device.
- the LLID value of the payload of the start control packet may be 0.
- the first sink device performs an ACL link operation for receiving an ACL data packet transmitted from the source device during a predetermined period, and the second sink device performs an ACL link operation while the first sink device performs an ACL link operation.
- the snooping link operation is performed and the first sink device and the second sink device complete the receiving operation for the ACL data packet, they may switch to the TWS control link operation.
- the first sink device may communicate with the source device through Bluetooth, and the first sink device may communicate with the second sink device through Bluetooth.
- the first sink device may communicate with the source device through Bluetooth, and the first sink device may communicate with the second sink device through UWB.
- the first sink device may transmit a message about success/failure in receiving ACL data to the source device through Bluetooth communication and simultaneously receive a message about success/failure of snooping of the second sink device from the second sink device.
- the second sink device is a first media data determination unit that determines whether the received data is the first data, and if the received data is not the first data, whether the received data is the same as the previously received data or the data currently stored in the reordering buffer If the received data is the first data or is not redundantly received data, an upper layer transmission determination unit that compares the sequence number of the received data with the expected sequence number and transmits the received data to a higher layer; and A flush reordering buffer determining unit may be included to determine whether the sequence number of the data matches all expected sequence numbers in the reordering buffer and transmit the data to an upper layer.
- a method of operating a wireless earbud system includes the steps of a source device transmitting audio data to a first sink device, the first sink device receiving audio data from the source device, and the second sink device Snooping audio data transmitted from the source device, and when there is data in which snooping has failed in the second sink device, transmitting a relay packet from the first sink device to the second sink device to perform a data relay operation. can do.
- the master earbud since the master earbud performs data relay by selectively transmitting only data not received by the slave earbud, the relay frequency and delay time are minimized, thereby improving battery efficiency.
- FIG. 1 is a schematic diagram of a wireless earbud system according to an embodiment of the present disclosure.
- FIG. 2 is a diagram showing an example of a TWS Control/Relay Packet format transmitted and received between earbuds in a wireless earbud system according to an embodiment of the present disclosure.
- FIG. 3 is a diagram illustrating a payload format of a TWS Initial Control Packet according to an embodiment of the present disclosure.
- FIG. 4 is a diagram illustrating a payload format of a TWS Start Control Packet according to an embodiment of the present disclosure.
- FIG. 5 is a diagram illustrating a payload format of a TWS Reply Control Packet according to an embodiment of the present disclosure.
- FIG. 6 is a diagram illustrating a payload format of a TWS End Control Packet according to an embodiment of the present disclosure.
- FIG. 7 is a flowchart illustrating an operation method when data relay of the wireless earbud system according to an embodiment of the present disclosure is not required.
- FIGS. 8 and 9 are flowcharts illustrating an operation method when data relay of the wireless earbud system according to an embodiment of the present disclosure is required.
- FIG. 10 is a control block diagram of an earbud slave device according to an embodiment of the present disclosure.
- FIG. 11 is a flowchart illustrating a method in which an earbud slave device operates by determining duplicate reception of an ACL data packet according to an embodiment of the present disclosure.
- FIG. 12 is a flowchart illustrating a process of forming a TWS control link between a master earbud and a slave earbud according to an embodiment of the present disclosure.
- 13 to 14 are flowcharts illustrating a method of connecting and exchanging information between earbuds according to an embodiment of the present disclosure.
- 15 is a flowchart illustrating a method of normally transmitting and receiving data using a heterogeneous link technology in a wireless earbud system according to an embodiment of the present disclosure.
- FIG. 16 is a diagram illustrating data transmission/reception and Ack timing charts according to FIG. 15 .
- 17 is a flowchart illustrating a case in which only the master earbud fails to receive data when a heterogeneous link technology is utilized in a wireless earbud system according to an embodiment of the present disclosure.
- FIG. 18 is a diagram illustrating data transmission/reception and Ack timing charts according to FIG. 17 .
- 19 is a flowchart illustrating a case in which only a slave earbud fails to receive data when a heterogeneous link technology is used in a wireless earbud system according to an embodiment of the present disclosure.
- FIG. 20 is a diagram illustrating data transmission/reception and Ack timing diagrams according to FIG. 19 .
- 21 is a flowchart illustrating a case in which both a master earbud and a slave earbud fail to receive data when a heterogeneous link technology is utilized in a wireless earbud system according to an embodiment of the present disclosure.
- FIG. 22 is a diagram illustrating data transmission/reception and Ack timing diagrams according to FIG. 21 .
- FIG. 23 is a diagram illustrating a state in which packets are captured by an air sniffer device when data relay is not required in the wireless earbud system according to an embodiment of the present disclosure.
- FIG. 24 is a diagram illustrating a state in which packets are captured by an air sniffer device when data relay is required in the wireless earbud system according to an embodiment of the present disclosure.
- FIG. 1 is a schematic diagram of a wireless earbud system according to an embodiment of the present disclosure.
- a wireless earbud system includes a source device 1 and a sink device, and the sink device may include a first sink device 10 and a second sink device 20.
- the sink device may include a first sink device 10 and a second sink device 20.
- One of the first and second sink devices 10 and 20 may be a master earbud, and the other may be a slave earbud.
- the first sink device 10 is a master device and the second sink device 20 is a slave device, but since this is only an example for convenience of explanation, it is reasonable not to be limited thereto.
- FIG. 1 schematically describes a method of operating a wireless earbud system.
- the source device 1 may transmit audio data to the first sink device 10 .
- the first sink device 10 may receive audio data from the source device 1 .
- the first sink device 10 may transmit a message such as ACK or NACK to the source device 1 according to a reception state of audio data.
- the first sink device 10 may transmit an ACK message to the source device 1 when audio data is normally received, and may transmit a NACK message to the source device 1 when audio data is not normally received.
- the second sink device 20 may snoop audio data transmitted from the source device 1 to the first sink device 10 .
- Snooping may refer to an operation of intercepting data on a network.
- the first sink device 10 and the second sink device 20 may obtain data from the source device 1 during a predetermined period.
- the first and second sink devices 10 and 20 may share data reception state information from the source device 1 using a TWS control packet.
- the TWS control packet may include a TWS start control packet control packet and a TWS reply control packet.
- the first sink device 10 transmits the TWS Start Control Packet to the second sink device 20
- the second sink device 20 controls the TWS reply to the first sink device 10.
- Data reception status information can be exchanged by transmitting a packet (TWS Reply Control Packet).
- the LLID value of the payload of the start control packet may be 0.
- the first sink device 10 transmits a start control packet including reception status information of the ACL data received from the source device 1 to the second sink device 20, and from the second sink device 20
- the sink device 20 may receive a reply control packet including reception state information of the snooped ACL data.
- the first sink device 10 may determine whether or not to relay data based on the data reception state information received from the second sink device 20 .
- the first sink device 10 determines whether a data relay operation is necessary by comparing the ACL data received from the source device 1 with the ACL data received by the second sink device 20 transmitted through a reply control packet. can judge
- the first sink device 10 may selectively control the second sink device 20 to perform data relay based on the data relay determination.
- the first sink device 10 may transmit a TWS relay packet to the second sink device 20 so that the second sink device 20 performs data relay.
- the first sink device 10 may transmit, to the second sink device 20, a relay packet delivering data for which the second sink device 20 fails to snoop in the ACL data buffer.
- the TWS relay packet may include a packet payload for which the second sink device 20 has failed snooping.
- the TWS relay packet may include a payload received by the first sink device 10 from the source device 1 .
- the second sink device 20 may transmit a null packet as a response thereto, and the null packet may include an ACK message.
- the first sink device 10 transmits all TWS relay packets to be relayed, and when receiving an ACK message in response thereto, generates a TWS end packet and transmits it to the second sink device 20. can That is, the first sink device 10 may transmit an end packet to the second sink device 20 when the data relay operation is not required or when the data relay operation is completed.
- the first sink device 10 selectively performs data relaying only on data that the second sink device 20 failed to snoop on, thereby improving latency and data relaying compared to a method in which data is relayed in the source device 1. It is possible to minimize the relay operation, and accordingly, there is an advantage in that battery consumption is minimized.
- a relay packet may be transmitted to the second sink device 20 to perform a data relay operation. Also, a control link for transmitting and receiving relay packets may be formed between the first sink device 10 and the second sink device 20 .
- the control link may be a TWS control link.
- the TWS Control Link can apply its own operation protocol and its own access code generation method to the TWS Control/Relay Packet, and can strengthen the TWS Control Link operation security between earbuds. there is.
- FIG. 2 is a diagram showing an example of a TWS Control/Relay Packet format transmitted and received between earbuds in a wireless earbud system according to an embodiment of the present disclosure.
- the wireless earbud system 1 generates a TWS control link between earbuds according to its own protocol method proposed in the present disclosure, and the TWS between earbuds is established in the created TWS control link.
- TWS Control/Relay packets for exchanging control information can be transmitted and received.
- the TWS control link may be its own control link for exchanging TWS control packets and TWS relay packets between earbuds. Also, in the present disclosure, a TWS control packet may be defined to exchange control information for controlling a data reception state from the source device 1 and a snooping link of the second sink device 20 .
- the TWS Control/Relay packet may have a format as shown in FIG. 2 .
- the Sync Word generation method of Access Code does not follow the Bluetooth standard and can be created in its own way.
- the controller performs the TWS Control Link control operation according to the self-defined protocol method.
- the DATA field of the payload consists of information defined for each TWS Control Packet so that the control procedure of the TWS control link can be performed according to the self-defined protocol.
- the access code's Sync Word generation method does not follow the Bluetooth standard and is created by the company's own method.
- the payload part includes a payload of an ACL data packet received by the first sink device 10 from the source device 1 for an Asynchronous Connection-Less (ACL) data packet that was not snooped by the second sink device 20 composed of the same information.
- ACL Asynchronous Connection-Less
- a method of generating a Sync Word may be as follows.
- - Sync Word is created by inverting the local/global bit of the Bluetooth device address used as an input to Sync Word generation from the original value.
- FIG. 3 is a diagram illustrating a payload format of a TWS Initial Control Packet according to an embodiment of the present disclosure.
- the TWS initial control packet may indicate a TWS control packet initially transmitted from the first sink device 10 to the second sink device 20 .
- the TWS initial control packet may include ACL link information and timing information between the first sink device 10 and the source device 1 for the second sink device 20 to snoop the source device 1. there is.
- the payload format of the TWS initial control packet may be as shown in FIG. 3 . That is, the payload of the TWS initial control packet has a header LLID of 0 and may include a control packet type and snoop link information. At this time, the snooping link information may include the following information.
- FIG. 4 is a diagram illustrating a payload format of a TWS Start Control Packet according to an embodiment of the present disclosure.
- the TWS start control packet may indicate a TWS control packet transmitted from the first sink device 10 to the second sink device 20 after the TWS initial control packet.
- the TWS start control packet may be a packet in which the first sink device 10 transfers ACL data reception state information received from the source device 1 to the second sink device 20 .
- the payload format of the TWS start control packet may be as shown in FIG. 4 . That is, the payload header LLID of the TWS start control packet is 0, and may include control packet type, relay information, and snooping link information. At this time, the relay information may include the following information.
- the snooping link information may include the following information.
- FIG. 5 is a diagram illustrating a payload format of a TWS Reply Control Packet according to an embodiment of the present disclosure.
- the TWS reply control packet may be a packet that transfers reception state information of ACL data snooped from the source device 1 by the second sink device 20 to the first sink device 10 .
- the payload format of the TWS reply control packet may be as shown in FIG. 5 . That is, the payload header LLID of the TWS reply control packet is 0, and may include control packet type and relay information. At this time, the relay information may include the following information.
- FIG. 6 is a diagram illustrating a payload format of a TWS End Control Packet according to an embodiment of the present disclosure.
- the TWS end control packet may be a packet for transmitting to the second sink device 20 that the first sink device 10 does not need data relay or that the data relay operation has been completed.
- the payload format of the TWS end control packet may be as shown in FIG. 6 . That is, the payload header LLID of the TWS end control packet is 0, and may include control packet type and session end information. At this time, the session end information may include the following information.
- ACL Action Flag A flag indicating that ACL link operation between earbuds is necessary following termination of the TWS control link operation.
- the TWS relay packet is transmitted from the first sink device 10 to the second sink device 20 so that the second sink device 20 performs a selective data relay operation on data that has not been snooped. It may be a packet that says
- the first sink device 10 receives a second sink device 20 based on its own relay information and the relay information received from the second sink device 20. 2 It may be determined whether a data relay operation of the sink device 20 is required. In the first sink device 10, the SEQ_NUM of the second sink device 20 is greater than or equal to the SEQ_NUM of the first sink device 10, and the PKT_NUM of the second sink device 20 is the first sink device ( If all of the second cases greater than or equal to PKT_NUM in 10) are satisfied, it may be determined that the data relay operation is not necessary. Meanwhile, the first sink device 10 may determine that a data relay operation is necessary when neither of the first case and the second case described above is satisfied.
- the data that the second sink device 20 could not snoop in the reception ACL data buffer stored in the first sink device 10 may be transmitted to the second sink device 20 through a TWS relay packet including The second sink device 20 may selectively perform a data relay operation using the TWS relay packet.
- the wireless earbud system can selectively perform data relay.
- the first sink device 10 performs an ACL link operation for receiving an ACL data packet transmitted from the source device 1 during a predetermined period, and the second sink device 20 determines that the first sink device 10 is connected to the ACL link.
- the TWS control link operation can switch
- FIG. 7 is a flowchart illustrating an operation method when data relay of the wireless earbud system according to an embodiment of the present disclosure is not required.
- a TWS control link may be formed between the master earbud and the slave earbud. That is, a TWS control link may be formed between the first sink device 10 and the second sink device 20 .
- the second sink device 20 After forming the TWS control link, the second sink device 20 receives a TWS initial control packet, and transmits snooping link parameters necessary for snooping link configuration through the TWS initial control packet to the first sink device 10. ) can be received from The second sink device 20 may perform a snooping link setup procedure through a snooping link parameter. Accordingly, the second sink device 20 may form a snooping link.
- the first sink device 10 and the second sink device 20 may attempt to receive an ACL data packet transmitted from the source device 1 during a predetermined period.
- the first sink device 10 feeds back ACK/NACK results to the source device 1 for success/failure of reception of the ACL data packet, and ACL data for constructing relay information transmitted to the TWS start control packet Receive status information of packets can be updated.
- the second sink device 20 performs a snooping operation on the ACL data packet from the source device 1, and provides reception state information of the ACL data packet for constructing relay information transmitted to the TWS reply control packet. can be updated
- the first sink device 10 and the second sink device 20 may switch to the TWS control link operation.
- the first sink device 10 may generate payload information of a TWS start control packet and transmit the corresponding packet to the second sink device 20 .
- the second sink device 20 generates payload information of the TWS reply control packet, and transmits the TWS reply control packet to the first sink device in response to receiving the TWS start control packet from the first sink device 10 ( 10) can be sent.
- the second sink device 20 may update Rx parameter (ARQN, SEQN, Payload counter, AFH Channel Map) information for a reception operation of the next snooping link according to snooping information of the received TWS start control packet.
- Rx parameter ARQN, SEQN, Payload counter, AFH Channel Map
- the first sink device 10 receives the TWS reply control packet transmitted from the second sink device 20, and based on the relay information of the corresponding payload, the second sink device 20 determines if there is data in which snooping has failed. can judge
- the first sink device 10 may determine that data relay is not necessary if there is no snooping failure data, and may determine that data relay is necessary if there is snooping failure data.
- the first sink device 10 determines that the data relay is not necessary because there is no data in which the second sink device 20 has failed snooping.
- the first sink device 10 may determine that data relay is not necessary, generate a payload of a TWS end control packet to deliver it, and transmit the generated packet to the second sink device 20 .
- the second sink device 20 receives the TWS end control packet, determines that the data relay operation is unnecessary based on the data relay not required information (No Data Relay Action Flag information) among the payload information of the packet, and determines that the source Switch to snooping link operation to receive ACL data packets from device 1.
- the data relay not required information No Data Relay Action Flag information
- the first sink device 10 When the first sink device 10 receives a null packet (including ACK) in response to the transmitted TWS end control packet, it terminates the TWS control link operation and receives the ACL data packet from the source device 1. You can switch to ACL link operation.
- a null packet including ACK
- FIGS. 8 and 9 are flowcharts illustrating an operation method when data relay of the wireless earbud system according to an embodiment of the present disclosure is required.
- a TWS control link can be formed between the master earbud and the slave earbud. That is, a TWS control link may be formed between the first sink device 10 and the second sink device 20 .
- the second sink device 20 may receive a TWS initial control packet and receive snooping link parameters necessary for snooping link configuration from the first sink device 10 through the TWS initial control packet there is.
- the second sink device 20 may perform a snooping link setup procedure through a snooping link parameter. Accordingly, the second sink device 20 can form a snooping link.
- the first sink device 10 and the second sink device 20 may attempt to receive an ACL data packet transmitted from the source device 1 during a predetermined period.
- the first sink device 10 feeds back ACK/NACK results to the source device 1 for success/failure of reception of the ACL data packet, and ACL data for constructing relay information transmitted to the TWS start control packet Receive status information of packets can be updated.
- the second sink device 20 performs a snooping operation on the ACL data packet from the source device 1, and provides reception state information of the ACL data packet for constructing relay information transmitted to the TWS reply control packet. can be updated
- the first sink device 10 and the second sink device 20 may switch to the TWS control link operation.
- the first sink device 10 may generate payload information of a TWS start control packet and transmit the corresponding packet to the second sink device 20 .
- the second sink device 20 generates payload information of the TWS reply control packet, and transmits the TWS reply control packet to the first sink device in response to receiving the TWS start control packet from the first sink device 10 ( 10) can be sent.
- the second sink device 20 may update Rx parameter (ARQN, SEQN, Payload counter, AFH Channel Map) information for a reception operation of the next snooping link according to snooping information of the received TWS start control packet.
- Rx parameter ARQN, SEQN, Payload counter, AFH Channel Map
- the first sink device 10 receives the TWS reply control packet transmitted from the second sink device 20, and based on the relay information of the corresponding payload, the second sink device 20 determines if there is data in which snooping has failed. can judge
- the first sink device 10 may determine whether a data relay operation is necessary according to relay information it possesses and relay information transmitted by the second sink device 20 .
- the first sink device 10 may determine whether there is data for which the second sink device 20 has failed snooping based on the relay information it possesses and the relay information transmitted by the second sink device 20 .
- the first sink device 10 may determine that data relay is not necessary if there is no snooping failure data, and may determine that data relay is necessary if there is snooping failure data.
- the first sink device 10 determines that data relay is necessary because there is data in which the second sink device 20 has failed snooping.
- the first sink device 10 may determine that data relay is necessary, load the packet payload for which snooping has failed, and transmit the TWS relay packet to the second sink device 20 .
- the second sink device 20 may perform data relay based on the received TWS relay packet.
- the second sink device 20 may transmit a null packet (including an ACK) to the first sink device 10 in response to the received TWS relay packet.
- the first sink device 10 After the first sink device 10 completes transmission of all TWS relay packets to be data relayed and reception of ACK as a response, it generates a payload of a TWS end control packet, and transfers the generated packets to the second sink device 20. can be sent to
- the second sink device 20 Upon receiving the TWS end control packet, the second sink device 20 recognizes that a data relay operation is no longer required and can switch to a snooping link operation for receiving an ACL data packet from the source device 1. .
- the first sink device 10 When the first sink device 10 receives a null packet (including ACK) in response to the transmitted TWS end control packet, it terminates the TWS control link operation and receives the ACL data packet from the source device 1. You can switch to ACL link operation.
- a null packet including ACK
- FIG. 10 is a control block diagram of an earbud slave device according to an embodiment of the present disclosure
- FIG. 11 is an earbud according to an embodiment of the present disclosure.
- the earbud slave according to an embodiment of the present disclosure, that is, the second sink device 20 includes a controller 21, a first media data determination unit 21, and an upper layer transmission determination unit 23 , at least some or all of the duplicate reception determining unit 25 and the flush reordering buffer determining unit 27.
- the controller 21 may control each of the first media data determination unit 21 , the upper layer transmission determination unit 23 , the duplicate reception determination unit 25 and the flush reordering buffer determination unit 27 .
- the first media data determination unit 21 may determine whether the received media data is first data.
- the media data may be an ACL data packet, but is not limited thereto.
- the first media data determination unit 21 may forward the received media data to the upper layer transmission determination unit 23 and wait for the next media data. On the other hand, if the first media data determination unit 21 determines that the received media data is not the first data, it may transfer the received media data to the duplicate reception determination unit 25 .
- the duplicate reception determining unit 25 may discard the received media data when it is determined that the received media data is the same as the previously received data or the same as the data currently stored in the reordering buffer. On the other hand, if it is determined that the received media data is not redundantly received data, the duplicate reception determining unit 25 may transfer the received media data to the upper layer transmission determining unit 23 .
- the upper layer transmission determination unit 23 transmits the media data to the upper layer and sets the value of the expected sequence number to 1. can increase
- the upper layer transmission determination unit 23 may transfer the corresponding layer to the flush reordering buffer determination unit 27.
- the flush reordering buffer determination unit 27 may determine whether the flush of the reordering buffer is performed. The flush reordering buffer determination unit 27 may determine whether to delete data stored in the reordering buffer.
- the flush reordering buffer determination unit 27 may determine whether the sequence number of the received media data matches all expected sequence numbers in the reordering buffer. The flush reordering buffer determination unit 27 determines that the sequence number of the received media data does not match all expected sequence numbers in the reordering buffer, and the sequence number of the received media data is the maximum value of all expected sequence numbers in the reordering buffer. If it is greater than the number, all data in the reordering buffer may be transmitted to the upper layer, and values of all expected sequence numbers in the reordering buffer may be increased by 1. The flush reordering buffer determiner 27 may store the received media data in the reordering buffer if the sequence number of the received media data matches at least one expected sequence number in the reordering buffer.
- FIG. 12 is a flowchart illustrating a process of forming a TWS control link between a master earbud and a slave earbud according to an embodiment of the present disclosure.
- a method of establishing a TWS control link between a first sink device 10 as a master earbud and a second sink device 20 as a slave earbud will be described.
- the first sink device 10 may wait for a response from the second sink device 20 through the HCI_Inquiry command after a device initialization process. After device initialization, the second sink device 20 may enter the inquiry scan mode of the first sink device 10 through the HCI_Write_Scan_Enable command.
- inquiry and page scan may be enabled. That is, the page scan mode may be entered immediately after the inquiry procedure.
- An inquiry procedure is performed between the first sink device 10 and the second sink device 20, and the first sink device 10 that receives the inquiry response from the second sink device 20 attempts an ACL connection through the HCI_Create_Connect command. can do.
- This may be the master earbud page scan mode.
- a paging procedure is performed between the first sink device 10 and the second sink device 20, and the second sink device 20 sends a Connection Accept. ) receives, TWS control link establishment between the first sink device 10 and the second sink device 20 may be completed.
- the first sink device 10 may enter the inquiry scan mode through the HCI_Write_Scan_Enable command to establish an ACL connection with the source device 1 such as a smart phone.
- FIGS. 13 and 14 are flowcharts illustrating a method of connecting and exchanging information between earbuds according to an embodiment of the present disclosure.
- the first sink device 10 may establish a TWS snoop link that allows the second sink device 20 to receive ACL data transmitted from the source device 1.
- the master earbud that is, the first sink device 10 may perform a Bluetooth pairing procedure with the source device 1 .
- an HCI_Snoop_Ready (New) Event is transmitted to the host of the first sink device 10, and the second sink device 20 It can be notified that snooping link setting is possible.
- the HCI_Snoop_Ready (New) Event may include controller information of the first sink device 10 for setting the snooping link.
- the host of the first sink device 10 may transmit snooping controller information through a previously established TWS control link with the second sink device 20 .
- the host of the second sink device 20 may transmit the received snooping controller information to the controller of the second sink device 20 through an HCI_Snoop_Configure (New) command.
- HCI_Snoop_Configure New
- the controller of the second sink device 20 sets the received snooping controller information and completes the Initial Synchronization Procedure
- the snooping controller link (Snoop Controller Link) to the host of the second sink device 20 through the HCI_Snoop_Configure_Complete Event. Controller Link) can be notified that the setting has been completed.
- the host of the second sink device 20 may notify the host of the first sink device 10 that snoop controller configuration has been completed.
- the host of the first sink device 10 may store host configuration information of the source device 1 and the first sink device 10 that has been set so far, and transmit it to the host of the second sink device 20. .
- the host of the second sink device 20 applies host configuration information of the receiving source device 1 and the first sink device 1, and sends Snoop Host Complete to the first sink device 10.
- the second sink device 20 may receive data sent by the source device 1 through a snoop link.
- FIG. 15 is a flowchart illustrating a method of normally transmitting and receiving data using a heterogeneous link technology in a wireless earbud system according to an embodiment of the present disclosure
- FIG. 16 is a diagram illustrating data transmission and reception and an Ack timing chart according to FIG. 15 am.
- the process of establishing the TWS control link between the first sink device 10 and the second sink device 20 through Bluetooth has been described. That is, the first sink device 10 may communicate with the source device 1 through Bluetooth, and the first sink device 10 may communicate with the second sink device 20 through Bluetooth.
- the first sink device 10 may communicate with the source device 1 through Bluetooth, and the first sink device 10 may communicate with the second sink device 20 through UWB.
- UWB Ultra Wide Band
- the first sink device 10 transmits a message about the success/failure of ACL data reception to the source device 1 through Bluetooth communication, and at the same time snooping success/failure of the second sink device 20 from the second sink device 20. You can receive messages about failures.
- TWS TWS control link
- UWB UWB
- the first sink device 10 When both the first sink device 10 and the second sink device 20 normally receive data from the source device 1, the first sink device 10 transmits data through an L1 link that is a Bluetooth data link. At the same time as transmitting an ACK to the source device 10, the second sink device 20 may notify the first sink device 10 of normal reception of Data#N through the L2 link, which is a TWS control link. there is.
- FIG. 17 is a flowchart illustrating a case in which only the master earbud does not receive data when a heterogeneous link technology is used in a wireless earbud system according to an embodiment of the present disclosure
- FIG. 18 is a data transmission/reception and Ack timing chart according to FIG. 17 is a drawing shown.
- the first sink device 10 cannot receive data from the source device 1, and only the second sink device 20 can successfully snoop the data transmitted from the source device 1. In this case, the first sink device 10 may retransmit data from the source device 1 through a Bluetooth retransmission procedure. If the second sink device 20 succeeds in snooping the data retransmitted from the source device 1, it may ignore the corresponding data.
- FIG. 19 is a flowchart illustrating a case in which only a slave earbud does not receive data when a heterogeneous link technology is used in a wireless earbud system according to an embodiment of the present disclosure
- FIG. 20 is a data transmission/reception and Ack timing chart according to FIG. 19 is a drawing shown.
- the first sink device 10 may receive data, and only the second sink device 20 may not receive data. In this case, the second sink device 20 may transmit a Nack message to the first sink device 10 through the L2 link.
- the first sink device 10 notifies the source device 1 of its data normal reception through the L1 link, and at the same time transmits data based on Nack information of the second sink device 20 received through the L2 link. ), that is, relaying can be performed. At this time, the number of relay attempts can be adjusted by setting the retransmission trial time.
- FIG. 21 is a flowchart illustrating a case in which both the master earbud and the slave earbud fail to receive data when a heterogeneous link technology is used in a wireless earbud system according to an embodiment of the present disclosure
- FIG. 22 is a data flow chart according to FIG. 21 It is a diagram showing transmission/reception and Ack timing diagrams.
- the first sink device 10 transmits a Nack message to the source device 1 through the L1 link, and at the same time, the L2 A Nack message may be received from the second sink device through the link. Therefore, when both the first sink device 10 and the second sink device 20 do not receive data in this way, the relay is not performed because the first sink device 10 also does not receive data. Data can be restored by retransmission of the data by the source device 1.
- ACK signals can be simultaneously transmitted and received, thereby minimizing the latency problem.
- FIG. 23 is a diagram showing packets captured by an air sniffer device when data relay is not required in the wireless earbud system according to an embodiment of the present disclosure
- FIG. It is a diagram showing a state in which packets are captured by an air sniffer device when data relay is required in a wireless earbud system.
- the master earbud since the master earbud normally receives data and the slave earbud also normally receives data, it can be confirmed that TWS control packets are transmitted and received without data relay.
- the slave earbud may not receive data. Accordingly, it can be confirmed that after the master earbud transmits the TWS start control packet, the TWS reply control packet is received, and at least one TWS relay control packet and TWS end control packet are transmitted.
- the present disclosure described above can be implemented as computer readable codes in a medium on which a program is recorded.
- the computer-readable medium includes all types of recording devices in which data that can be read by a computer system is stored. Examples of computer-readable media include Hard Disk Drive (HDD), Solid State Disk (SSD), Silicon Disk Drive (SDD), ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage device, etc.
- HDD Hard Disk Drive
- SSD Solid State Disk
- SDD Silicon Disk Drive
- ROM Read Only Memory
- RAM compact disc-read only memory
- CD-ROM compact disc-read only memory
- magnetic tape magnetic tape
- floppy disk magnetic tape
- optical data storage device etc.
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Abstract
Description
Claims (15)
- 소스 장치;소스 장치로부터 오디오 데이터를 수신하는 제1 싱크 장치; 및상기 소스 장치에서 전송된 오디오 데이터를 스누핑하는 제2 싱크 장치를 포함하고,상기 제1 싱크 장치는상기 제2 싱크 장치에서 스누핑 실패한 데이터가 존재하는 경우, 데이터 릴레이 동작을 수행하도록 상기 제2 싱크 장치로 릴레이 패킷을 전송하는무선 이어버드 시스템.
- 청구항 1에 있어서,상기 제1 싱크 장치와 상기 제2 싱크 장치 사이에 상기 릴레이 패킷을 송수신하기 위한 제어 링크를 형성하는무선 이어버드 시스템.
- 청구항 1에 있어서,상기 제1 싱크 장치는상기 소스 장치로부터 수신한 ACL 데이터의 수신 상태 정보를 포함하는 스타트 제어 패킷을 상기 제2 싱크 장치로 전송하고,상기 제2 싱크 장치로부터 상기 제2 싱크 장치가 스누핑한 ACL 데이터의 수신 상태 정보를 포함하는 리플라이 제어 패킷을 수신하는무선 이어버드 시스템.
- 청구항 3에 있어서,상기 제1 싱크 장치는상기 소스 장치로부터 수신한 ACL 데이터와 상기 리플라이 제어 패킷을 통해 전달받은 상기 제2 싱크 장치가 수신한 ACL 데이터의 비교를 통해 상기 데이터 릴레이 동작의 필요 여부를 판단하는무선 이어버드 시스템.
- 청구항 4에 있어서,상기 제1 싱크 장치는상기 데이터 릴레이 동작이 필요한 경우, ACL 데이터 버퍼에서 상기 제2 싱크 장치가 스누핑 실패한 데이터를 전달하는 릴레이 패킷을 상기 제2 싱크 장치로 전송하는무선 이어버드 시스템.
- 청구항 1에 있어서,상기 제1 싱크 장치는상기 데이터 릴레이 동작이 필요하지 않으면 상기 제2 싱크 장치로 엔드 패킷을 전송하는무선 이어버드 시스템.
- 청구항 1에 있어서,상기 제1 싱크 장치는상기 데이터 릴레이 동작이 완료되면 상기 제2 싱크 장치로 엔드 패킷을 전송하는무선 이어버드 시스템.
- 청구항 1에 있어서,상기 릴레이 패킷은페이로드가 상기 제1 싱크 장치가 상기 소스 장치로부터 수신한 페이로드로 구성되는무선 이어버드 시스템.
- 청구항 3에 있어서,상기 스타트 제어 패킷은페이로드의 LLID 값이 0인무선 이어버드 시스템.
- 청구항 1에 있어서,상기 제1 싱크 장치는소정 구간 동안 상기 소스 장치로부터 송신되는 ACL 데이터 패킷을 수신하는 ACL 링크 동작을 수행하고,상기 제2 싱크 장치는상기 제1 싱크 장치가 상기 ACL 링크 동작을 수행하는 동안 상기 ACL 데이터 패킷을 수신하기 위한 스누핑 링크 동작을 수행하고,상기 제1 싱크 장치 및 상기 제2 싱크 장치는상기 ACL 데이터 패킷에 대한 수신 동작을 완료하면, TWS 제어 링크 동작으로 전환하는무선 이어버드 시스템.
- 청구항 1에 있어서,상기 제1 싱크 장치는 상기 소스 장치와 블루투스로 통신하고,상기 제1 싱크 장치는 상기 제2 싱크 장치와 블루투스로 통신하는무선 이어버드 시스템.
- 청구항 1에 있어서,상기 제1 싱크 장치는 상기 소스 장치와 블루투스로 통신하고,상기 제1 싱크 장치는 상기 제2 싱크 장치와 UWB로 통신하는무선 이어버드 시스템.
- 청구항 12에 있어서,상기 제1 싱크 장치는ACL 데이터의 수신 성공/실패에 대한 메시지를 상기 블루투스 통신으로 상기 소스 장치로 전송하는 동시에 상기 제2 싱크 장치로부터 상기 제2 싱크 장치의 스누핑 성공/실패에 대한 메시지를 수신하는무선 이어버드 시스템.
- 청구항 1에 있어서,상기 제2 싱크 장치는수신된 데이터가 첫번째 데이터인지 판단하는 첫번째 미디어 데이터 판단부,상기 수신된 데이터가 첫번째 데이터가 아닐 경우, 상기 수신된 데이터가 이전에 수신된 데이터와 동일하거나 현재 리오더링 버퍼에 저장된 데이터인지 판단하는 중복 수신 판단부,상기 수신된 데이터가 첫번째 데이터이거나, 중복 수신된 데이터가 아닌 경우, 수신된 데이터의 시퀀스 넘버를 예상 시퀀스 넘버와 비교하여 상위 레이어로 전송하는 상위 레이어 전송 판단부, 및상기 수신된 데이터의 시퀀스 넘버를 상기 리오더링 버퍼 내 모든 예상 시퀀스 넘버와 일치 여부를 판단하여 상위 레이어로 전송하는 플러쉬 리오더링 버퍼 판단부를 포함하는무선 이어버드 시스템.
- 소스 장치가 제1 싱크 장치로 오디오 데이터를 전송하는 단계;상기 제1 싱크 장치가 상기 소스 장치로부터 상기 오디오 데이터를 수신하는 단계;제2 싱크 장치가 상기 소스 장치에서 전송된 오디오 데이터를 스누핑하는 단계; 및상기 제2 싱크 장치에서 스누핑 실패한 데이터가 존재하는 경우, 데이터 릴레이 동작을 수행하도록 상기 제1 싱크 장치에서 상기 제2 싱크 장치로 릴레이 패킷을 전송하는 단계를 포함하는무선 이어버드 시스템의 동작 방법.
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PCT/KR2021/015186 WO2023074929A1 (ko) | 2021-10-27 | 2021-10-27 | 무선 이어버드 시스템 및 그의 동작 방법 |
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KR20200139198A (ko) * | 2018-04-28 | 2020-12-11 | 1모어 주식회사 | 이어폰 무선 통신 방법, 마스터 이어폰, 슬레이브 이어폰 및 이어폰 시스템 |
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2021
- 2021-10-27 KR KR1020247017571A patent/KR20240108422A/ko unknown
- 2021-10-27 EP EP21962555.5A patent/EP4425808A1/en active Pending
- 2021-10-27 WO PCT/KR2021/015186 patent/WO2023074929A1/ko active Application Filing
Patent Citations (5)
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KR101367415B1 (ko) * | 2007-10-30 | 2014-02-26 | 삼성전자주식회사 | 무선 디바이스의 연결장치 및 연결방법 |
KR101680408B1 (ko) * | 2009-09-10 | 2016-12-12 | 코스 코퍼레이션 | 무선 이어폰 세트 및 그 동기화 방법 |
KR20150012306A (ko) * | 2012-05-26 | 2015-02-03 | 퀄컴 인코포레이티드 | Bluetooth? 기술을 이용한 스마트 페어링 |
KR20170138588A (ko) * | 2015-06-05 | 2017-12-15 | 애플 인크. | 웨어러블 디바이스의 상태에 기초하는 컴패니언 통신 디바이스 거동의 변경 |
KR20200139198A (ko) * | 2018-04-28 | 2020-12-11 | 1모어 주식회사 | 이어폰 무선 통신 방법, 마스터 이어폰, 슬레이브 이어폰 및 이어폰 시스템 |
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KR20240108422A (ko) | 2024-07-09 |
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