Method and device for processing voice command through uibc

A first WiFi Display (WFD) device for performing voice command processing through a User Input Back Channel (UIBC), the device comprises:

• a communication unit for communicating with a second WFD device;
• and
• a processor operably connected to the communication unit,
• wherein:
• the processor sends a Real-Time Streaming Protocol (RTSP) M3 request message to
• the second WFD device to request information about a Voice Command Device Category (VCDC) capability of the second WFD device,
• receives an RTSP M3 response message in response to the RTSP M3 request message from the second WFD device, the RTSP M3 response message comprising input category information and VCDC capability information set to the VCDC of the second WFD device,
• sends a RTSP M4 request message in an RTSP initiation state to the second WFD device, the RTSP M4 request message comprising input category information and initial setting VCDC capability information set to the VCDC, and
• receives an RTSP M4 response message from the second WFD device in response to the RTSP M4 request message;
• the first WFD device is a device supporting streaming of multimedia contents;
• the second WFD device is a device receiving and rendering the multimedia contents from the first WFD device through a Peer-to-Peer (P2P) link with the first WFD device;
• and
• the VCDC capability information comprises information about a plurality of voice-based operation control commands for control of the multimedia contents played in the first WFD device and the second WFD device by the second WFD device, respectively.