Method for transmitting and receiving audio data in wireless communication system supporting bluetooth communication and device therefor

1. A method for transceiving audio data by using Bluetooth low energy in a wireless communication system supporting Bluetooth communication by a first device, the method comprising:

establishing at least one isochronous channel for transmitting isochronous data with at least one second device by setting an anchor point representing a time at which new information is transmitted;

transmitting the audio data to the at least one second device through at least one established isochronous channel during a first interval starting from the anchor point;

allocating to the at least one second device a response transmission time slot in which a response associated with whether to receive the audio data can be received from the at least one second device; and

receiving the response associated with the reception of the audio data from the at least one second device through the allocated response transmission time slot,

wherein the first interval includes at least one second interval in which initial transmissions of the audio data and retransmission of the audio data occur,

wherein the initial transmission of the audio data occurs at the anchor point of the first interval, and

wherein the response transmission time slot is allocated for each of the at least one second device.

2. The method of claim 1 , further comprising:

retransmitting the audio data to the at least one second device during at least one second interval.

3. The method of claim 2 , wherein the audio data is retransmitted once for each second interval.

4. The method of claim 2 , wherein when a non-acknowledgement response (NACK) indicating that the audio data is not received from at least one second device is received, the audio data is retransmitted to the at least one second device.

5. The method of claim 2 , further comprising:

stopping retransmitting the audio data when a non-acknowledgement response (NACK) indicating that the audio data is not received from the at least one second device is not received; and

entering a power saving state from a time when the retransmission of the audio data is stopped.

6. The method of claim 2 , wherein the retransmitting of the audio data includes

performing energy detection during at least one second interval when a non-acknowledgement response (NACK) indicating that the audio data is not received from the at least one second device is not received,

comparing a result of the energy detection and a predetermined threshold, and

retransmitting the audio data to the at least one second device during at least one second interval based on the comparing.

7. The method of claim 2 , wherein when an acknowledgement (ACK) response indicating that the audio data is received from the at least one second device is not received, the audio data is retransmitted only to a second device that does not transmit the ACK response.

8. The method of claim 2 , further comprising:

stopping retransmitting the audio data when an acknowledgement response (ACK) indicating that the audio data is received from the at least one second device is all received; and

entering a power saving state from a time when the retransmission of the audio data is stopped.

9. The method of claim 1 , further comprising:

wherein the first interval further includes a third interval that operates in a power saving state,

entering the power saving state during the third interval; and

terminating the power saving state for transmitting new audio data during a subsequent first interval.

10. The method of claim 1 , wherein the number of one or more second intervals is determined by the maximum number of retransmission times of the audio data.

11. The method of claim 1 , wherein the allocated response transmission time slot is positioned next to an audio data transmission interval.

12. The method of claim 1 , wherein the audio data is transmitted through frequency hopping for each second interval.

13. The method of claim 1 , further comprising:

receiving an advertising message from at least one second device;

transmitting a scan request message for acquiring additional information to the at least one second device; and

receiving a scan response message corresponding to a response to the scan request from at least one second device.

14. The method of claim 1 , wherein the audio data is transmitted to the at least one second device by a broadcast or a unicast method.

15. The method of claim 1 , wherein the first device is a master or a conductor,

the at least one second device is a slave or a member,

the first interval is an isochronous connection interval or an isochronous event interval, and

the second interval is a sub event interval or an isochronous connection interval.

16. A first device for transceiving audio data by using Bluetooth low energy in a wireless communication system supporting Bluetooth communication, the first device comprising:

a transceiver; and

a processor functionally connected with the transceiver,

wherein the processor:

establishes at least one isochronous channel for transmitting the audio data with at least one second device by setting an anchor point representing a time at which new information is transmitted,

controls the transceiver to transmit the audio data to the at least one second device through at least one established isochronous channel during a first interval starting from the anchor point,

allocates to the at least one second device a response transmission time slot in which a response associated with whether to receive the audio data can be received from the at least one second device, and

controls the transceiver to receive the response associated with the reception of the audio data from the at least one second device through the allocated response transmission time slot,

wherein the first interval includes at least one second interval in which initial transmissions of the audio data and retransmission of the audio data occur,

wherein the initial transmission of the audio data occurs at the anchor point of the first interval, and

wherein the response transmission time slot is allocated for each of the at least one second device.