CONTROL LINK FOR WIRELESS DISPLAY UNIT

• US 20110107387A1
• Filed: 11/03/2009
• Published: 05/05/2011
• Est. Priority Date: 11/03/2009
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Chaubey, Nishith, Rajamani, Krishnan, Soliman, Samir
• Granted Patent: US 8,332,904 B2
• Time in Patent Office: Days
• US Class Current: 725/118
• CPC Class Codes: H04H 20/61 for local area broadcast, e.g. instore broadcast
• CPC Class Codes: H04N 21/4122 additional display device, e.g. video projector digital output for controlling a plurality of local displays G06F3/1423
• CPC Class Codes: H04N 21/43637 involving a wireless protocol, e.g. Bluetooth, RF or wireless LAN [IEEE 802.11] arrangements for wireless networking or broadcasting of information in indoor or near-field type systems H04B10/114
• CPC Class Codes: H04N 21/4405 involving video stream decryption
• CPC Class Codes: H04N 21/4623 Processing of entitlement messages, e.g. ECM [Entitlement Control Message] or EMM [Entitlement Management Message] arrangements for conditional access to broadcast information or to broadcast-related services H04H60/14
• CPC Class Codes: H04N 21/6377 directed to server one-way streaming services wherein the source is controlled by the destination H04L65/613
• CPC Class Codes: H04N 21/658 Transmission by the client directed to the server
• CPC Class Codes: H04N 7/1675 Providing digital key or authorisation information for generation or regeneration of the scrambling sequence pseudo-random number generators in general G06F7/58

Abstract

A method comprises establishing a session between a host and a display unit, including transmitting media content according to a television broadcasting standard, and implementing control traffic for the session on a bi-directional control link independent of the television broadcasting standard.

Claims

1. A method comprising:

transmitting media content over a media link according to a television broadcasting standard during a session between a host and a display unit; and

transmitting control traffic for the session on a bi-directional control link independent of the television broadcasting standard.

2. The method of claim 1, wherein transmitting control traffic comprises:

discovering the display unit; and

authenticating the display unit.

3. The method of claim 1 wherein the control traffic includes signals for at least one of the following functions:

mutual discovery;

mutual authentication;

video privacy key derivation;

content protection;

video channel selection;

transmission power control;

host selection;

multi-stream composition control; and

display unit control.

4. The method of claim 1 wherein the television broadcasting standard comprises a digital television standard.

5. The method of claim 4 wherein the digital television standard is selected from a list consisting of:

an Advanced Television Systems Committee (ATSC) standard;

a Digital Video Broadcasting (DVB) standard;

an Integrated Services Digital Broadcasting (ISDB) standard; and

a Digital Multimedia Broadcast (DMB) standard.

6. The method of claim 1 wherein the control link comprises a short-range link.

7. The method of claim 1 wherein the control link comprises at least one of:

an IEEE 802.11 link;

an infrared link

an Ultra Wideband (UWB) link;

a Personal Area Network (PAN) link; and

an IEEE 802.3 link.

8. The method of claim 1 wherein implementing control traffic comprises:

transmitting discovery signals.

9. The method of claim 1 further comprising:

discerning a transmission rate requirement; and

transmitting the media content on the control link in response to discerning the transmission rate requirement.

10. The method of claim 9 comprising:

discerning unsuitability of the control link for transmitting the media content; and

in response to discerning unsuitability of the control link, transmitting the media content over the media link within a bitrate supported by the television broadcast standard.

11. The method of claim 1 further comprising:

discerning a lack of support for the television broadcast standard at the display unit; and

transmitting the media content on the control link in response to discerning the lack of support for the television broadcast standard.

12. The method of claim 1 wherein the media content is transmitted on at least one white space channel.

13. The method of claim 1 further comprising:

receiving an indication of interference associated with transmission of the media content; and

adjusting a characteristic of the transmission of at least one of the media content and the control traffic in response to the indication of interference.

14. The method of claim 13, wherein adjusting the characteristic comprises at least one of adjusting media content transmission power and transmitting the media content over the control link.

15. The method of claim 1 further comprising:

receiving from the display unit an indication of signal quality; and

adjusting a characteristic of transmission of at least one of the media content and the control traffic in response to the indication of signal quality.

16. The method of claim 1, wherein the bi-directional control link comprises a point-to-point link.

17. The method of claim 1 performed by a single wireless host unit.

18. A system comprising:

a Radio Frequency (RF) unit configured to process media content according to a television broadcast standard and to transmit and receive control signals according to a protocol different from the television broadcast standard; and

a control unit in communication with the RF unit, the control unit sending and receiving the control signals and performing control functions associated with the control signals.

19. The system of claim 18 incorporated into a device selected from a group consisting of a music player, a video player, an entertainment unit, a communications device, a personal digital assistant (PDA), a desktop computer, a smartphone, a netbook, a smartbook, and a laptop computer.

20. The system of claim 18 in which the system is integrated into a semiconductor die.

21. The system of claim 18 in which the system is integrated into a PC card.

22. A system comprising:

means for transmitting or receiving media content over the air on a media link using a television transmission standard; and

means for controlling use of the media content through a bi-directional control link independent of the television transmission standard.

23. The system of claim 22 implemented in at least one of a handheld communication device and a personal computer.

24. The system of claim 22 implemented in at least one of a computer monitor and a television.

25. The system of claim 22 wherein the bi-directional link comprises one or more of:

an IEEE 802.11 link;

an infrared link;

an Ultra Wideband (UWB) link;

a Personal Area Network (PAN) link; and

an IEEE 802.3 link.

26. A computer program product tangibly embodying a computer readable medium having computer program logic recorded thereon, the computer program product comprising:

code that processes media content of a media link according to a television broadcast standard; and

code that communicates control signals over a bi-directional link to control a viewing session of the transmitted media content, the bi-directional link being independent of the television broadcast standard.

27. The computer program product of claim 26 wherein the media link is within at least one white space channel.

28. The computer program product of claim 26 further comprising:

code that sends control signals in response to cross-talk associated with transmission of the media content.

29. A method comprising:

establishing a session between a host and a display unit, including;

transmitting media content on an over the air media link according to a television broadcasting standard;

performing a discovery function to discover the display unit; and

performing one of the following actions in response to the discovery function;

implementing control traffic for the session on a bi-directional control link independent of the television broadcasting standard in response to a successful discovery function; and

implementing no control traffic on a bi-directional link in response to an unsuccessful discovery function.

30. A display system, comprising:

a tuner configured to receive and process media content from a media link according to a television broadcast standard; and

a control unit configured to establish a bi-directional control link with a transmitter of media signals, the bi-directional control link being independent of the television broadcast standard.

31. The display system of claim 30 comprising a television.