Method and apparatus for processing audio signal by using Bluetooth technology

1. A method for processing a voice command received from at least one device using a Bluetooth low energy technology, the method performed by a first device comprising:

transmitting a first advertising message including a maximum service user parameter indicating the maximum number of manageable user devices or an available service user parameter indicating the number of currently available user devices to a peripheral device;

receiving a first request message requesting establishment of an audio channel for transmitting and receiving the voice command from a second device;

establishing the audio channel with the second device;

receiving a voice command instructing performance of a particular service from the second device through the audio channel;

receiving a second request message requesting establishment of an audio channel for transmitting and receiving the voice command from a third device; and

transmitting to the third device a first response message including an accept or reject intention determined based on values of the maximum service user parameter or the available service user parameter to the third device in response to the second request message.

2. The method of claim 1 , wherein the first advertising message includes a public key of the first device,

the first request message includes a public key of the second device, and

an audio command received through the audio channel is encrypted using the public key of the first device.

3. The method of claim 1 , further comprising:

transmitting a trigger command registered in the first device to the second device,

wherein the trigger command indicates a voice command which causes the first device to enter a state capable of receiving a voice command.

4. The method of claim 3 , wherein the first request message includes the trigger command or information generated based on the trigger command.

5. The method of claim 3 , wherein the transmitting of the trigger command includes selecting a bearer for transmitting the trigger command from advertising extension, advertising, or GATT, and

the trigger command is transmitted to the second device using the selected bearer.

6. The method of claim 1 , wherein the first request message and the second request message are received during a collecting period for receiving a request of a voice recognition service of a plurality of users, and

the voice command instructing performance of the particular service is received during a service period for transmitting and receiving a voice command.

7. The method of claim 6 , wherein the service period is divided and allocated to the second device and the third device.

8. The method of claim 1 , wherein the establishing of the audio channel includes establishing the audio channel with the third device, and

a channel interval of the audio channel includes a first channel event allocated to the second device and a second channel event allocated to the third device.

9. The method of claim 1 , wherein the audio channel is an isochronous channel.

10. The method of claim 1 , further comprising:

exchanging location information with the second device,

wherein in the establishing of the audio channel, an audio channel is established with the second device based on an available service policy determined depending on the location of the second device.

11. The method of claim 10 , wherein the location information includes a received signal strength indication (RSSI) or a window setting parameter.

12. A first device for processing a voice command received from at least one device using a Bluetooth low energy technology, comprising:

a communicator configured to communicate with an external device with a wired or wireless manner; and

a processor configured to be functionally connected to the communicator,

wherein the processor transmits a first advertising message including a maximum service user parameter indicating the maximum number of manageable user devices or an available service user parameter indicating the number of currently available user devices to a peripheral device;

receives a first request message requesting establishment of an audio channel for transmitting and receiving the voice command from a second device;

establishes the audio channel with the second device;

receives a voice command instructing performance of a particular service from the second device through the audio channel;

receives a second request message requesting establishment of an audio channel for transmitting and receiving the voice command from a third device; and

transmits to the third device a first response message including an accept or reject intention determined based on values of the maximum service user parameter or the available service user parameter to the third device in response to the second request message.