Method and apparatus for providing user input back channel in audio/video system

1. A method of communicating with an audio/video (AV) source device, wherein the method is performed by an AV sink device, the method comprising:

performing a device discovery procedure with the AV source device;

receiving a request, from the AV source device, related to a User Input Back Channel (UIBC) capability of the AV sink device;

transmitting a response related to the UIBC capability of the AV sink device to the AV source device;

receiving a request including UIBC setting information from the AV source device;

enabling a user input back channel (UIBC) based on the UIBC setting information;

transmitting a response related to the enabled UIBC to the AV source device; and

transmitting user input information received by the AV sink device to the AV source device through the UIBC.

2. The method of claim 1 , wherein the user input information comprises at least one of a function code for controlling the AV source device, pointing information, and character data.

3. The method of claim 1 , wherein the performing device discovery procedure comprises setting up an AV control session and an AV data session and wherein the AV control session comprises a real-time streaming protocol (RTSP).

4. The method of claim 1 , wherein the UIBC capability of the AV sink device comprises at least one of a real-time streaming protocol (RTSP), a real-time transport protocol (RTP), Bluetooth, Zigbee, and digital living network association (DLNA).

5. The method of claim 1 , wherein the transmitting of the user input information comprises transmitting data and control information about the user input information through a wireless fidelity display (WFD) session.

6. The method of claim 5 , wherein the WFD session comprises at least one of a real-time transport protocol (RTP) session, a Bluetooth session, a Zigbee session, and a digital living network association (DLNA) session.

7. The method of claim 6 , wherein the transmitting of the user input information further comprises transmitting control information about the user input through the DLNA session.

8. The method of claim 1 , wherein the UIBC setting information comprises a UIBC enable request or a UIBC disable request.

9. The method of claim 1 , further comprising notifying disablement of the UIBC to the AV source device.

10. The method of claim 1 , wherein the response related to the UIBC capability of the AV sink device includes at least one from among information about whether a UIBC is supported, information about a supported UIBC path, and information about a supported user input data type.

11. A method of communicating with an audio/video (AV) sink device, wherein the method is performed by an AV source device, the method comprising:

performing a device discovery procedure with the AV sink device;

transmitting a request, to the AV sink device, related to a User Input Back Channel (UIBC) capability of the AV sink device;

receiving a response related to the UIBC capability of the AV sink device from the AV sink device;

transmitting a request including UIBC setting information to the to the AV sink device;

receiving a response related to a UIBC enabled by the AV sink device from the AV sink device; and

receiving user input information received by the AV sink device from the AV sink device through the UIBC.

12. The method of claim 11 , wherein the user input information comprises at least one of a function code for controlling the AV source device, pointing information, and character data.

13. The method of claim 11 , wherein the performing device discovery procedure comprises setting up an AV control session and an AV data session and wherein the AV control session comprises a real-time streaming protocol (RTSP).

14. The method of claim 11 , wherein the UIBC capability of the AV sink device comprises at least one of real-time streaming protocol (RTSP), real-time transport protocol (RTP), Bluetooth, Zigbee, and digital living network association (DLNA).

15. The method of claim 11 , wherein the UIBC setting information comprises a UIBC enable request or a UIBC disable request.