Transmitter quieting and null data encoding

• US 8,958,475 B2
• Filed: 07/01/2010
• Issued: 02/17/2015
• Est. Priority Date: 07/02/2009
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Raveendran, Vijayalakshmi R.
• Primary Examiner(s): Czekaj, Dave
• Assistant Examiner(s): Beck, Leron
• Application Number:
  US12/829,293
• Publication Number:
  US 20110002377A1
• Time in Patent Office: 1,692 Days
• Field of Search: 37524001-24029
• US Class Current: 375/240.1
• CPC Class Codes: H04H 20/42 Arrangements for resource management
• CPC Class Codes: H04H 60/41 for identifying broadcast space, i.e. broadcast channels, broadcast stations or broadcast areas
• CPC Class Codes: H04H 60/80 characterised by transmission among terminal devices

Abstract

A method comprises encoding a set of frames of multimedia data, encoding null data for a period following the set of frames of multimedia data, modulating the encoded set of frames and the null data, wherein modulating the null data creates a null interval over the period, transmitting the encoded set of frames via a transmitter, and blanking the transmitter during the null interval.

Claims

1. A method comprising:

encoding a set of frames of digital multimedia data in a first data stream;

encoding digital null data for a period following the set of frames of multimedia data in a second data stream;

modulating, with a multiplexer, the encoded set of frames of the first stream and the null data of the second stream into a combined stream, wherein modulating the null data creates a null interval over the period, wherein the null interval is defined to correspond to a transmitter quieting interval during which a transmitter refrains from transmitting any data;

transmitting the encoded set of frames of the combined stream via the transmitter;

blanking the transmitter during the null interval of the combined stream, wherein blanking the transmitter during the null interval comprises refraining from transmitting data via the transmitter during the transmitter quieting interval corresponding to the null interval; and

performing a sensing operation while blanking the transmitter during the transmitter quieting interval corresponding to the null interval wherein the one or more null intervals are not less than six milliseconds to provide a sufficient time for reliable spectrum sensing to be performed.

2. The method of claim 1, wherein the null data causes blanking of the transmitter.

3. The method of claim 1, wherein the set of frames comprise one of:

a set of audio frames,

a set of video frames, and

a combined set of audio frames and video frames.

4. The method of claim 1, wherein the null data comprises a set of packets having all zeros within packet payloads of the set of packets.

5. The method of claim 1, wherein performing the sensing operation includes sensing for other wireless signals at one or more particular frequencies.

6. The method of claim 5, wherein sensing for other wireless signals comprises sensing for a licensed signal at the one or more particular frequencies.

7. The method of claim 5, further comprising switching the transmitter to a different frequency upon sensing another wireless signal at the one or more particular frequencies.

8. The method of claim 5, further comprising periodically repeating the method in compliance with a wireless communication standard that requires periodic sensing with unlicensed use of the one or more particular frequencies.

9. The method of claim 4, wherein the method is repeated periodically for periodic sensing operations.

10. A device comprising:

a multimedia encoding unit that encodes a set of frames of digital multimedia data in a first data stream and encodes digital null data for a period following the set of frames of multimedia data in a second data stream;

a modulator unit that modulates, with a multiplexer, the encoded set of frames of the first stream and the null data of the second stream into a combined stream, wherein modulating the null data creates a null interval over the period, and wherein the null interval is defined to correspond to a transmitter quieting interval during which a transmitter refrains from transmitting any data;

the transmitter that transmits the encoded set of frames and blanks during the transmitter quieting interval corresponding to the null interval, wherein to blank during the null interval, the transmitter refrains from transmitting data via the transmitter during the transmitter quieting interval corresponding to the null interval; and

a sensor unit that performs a sensing operation while the transmitter blanks during the transmitter quieting interval corresponding to the null interval wherein the one or more null intervals are not less than six milliseconds to provide a sufficient time for reliable spectrum sensing to be performed.

11. The device of claim 10, wherein the presence of the null data causes the blanking of the transmitter.

12. The device of claim 10, wherein the set of frames comprise one of:

a set of audio frames,

a set of video frames, and

a combined set of audio frames and video frames.

13. The device of claim 10, wherein the null data comprises a set of packets having all zeros within packet payloads of the set of packets.

14. The device of claim 10, wherein in performing the sensing operation, the sensor unit senses for other wireless signals at one or more particular frequencies.

15. The device of claim 14, wherein the sensor unit senses for a licensed signal at the one or more particular frequencies.

16. The device of claim 14, wherein the transmitter switches to a different frequency when the sensor unit senses another wireless signal at the one or more particular frequencies.

17. The device of claim 14, the sensor unit periodically repeats the sensing operation and the transmitter unit periodically repeats blanking in compliance with a wireless communication standard that requires periodic sensing with unlicensed use of the one or more particular frequencies.

18. The device of claim 14, wherein the sensor unit periodically repeats the sensing operation.

19. A device comprising:

means for encoding a set of digital frames of multimedia data in a first data stream;

means for encoding digital null data for a period following the set of frames of multimedia data in a second data stream;

means for modulating, with a multiplexer, the encoded set of frames of the first stream and the null data of the second stream into a combined stream, wherein modulating the null data creates a null interval over the period, and wherein the null interval is defined to correspond to a transmitter quieting interval during which a transmitter refrains from transmitting any data;

means for transmitting the encoded set of frames of the combined stream via the transmitter;

means for blanking the means for transmitting during the null interval of the combined stream, wherein the means for blanking the means for transmitting during the null interval comprises means for refraining from transmitting data via the transmitter during the transmitter quieting interval corresponding to the null interval; and

means for performing a sensing operation while blanking the transmitter during the transmitter quieting interval corresponding to the null interval wherein the one or more null intervals are not less than six milliseconds to provide a sufficient time for reliable spectrum sensing to be performed.

20. The device of claim 19, wherein the null data causes blanking of the means for transmitting.

21. The device of claim 19, wherein the set of frames comprise one of:

a set of audio frames,

a set of video frames, and

a combined set of audio frames and video frames.

22. The device of claim 19, wherein the null data comprises a set of packets having all zeros within packet payloads of the set of packets.

23. The device of claim 19, wherein the means for performing the sensing operation includes means for sensing for other wireless signals at one or more particular frequencies.

24. The device of claim 23, wherein the means for sensing for other wireless signals comprises means for sensing for a licensed signal at the one or more particular frequencies.

25. The device of claim 23, further comprising switching the transmitter to a different frequency upon sensing another wireless signal at the one or more particular frequencies.

26. The device of claim 23, further comprising periodically repeating the method in compliance with a wireless communication standard that requires periodic sensing with unlicensed use of the one or more particular frequencies.

27. The device of claim 19, wherein the method is repeated periodically for periodic sensing operations.

28. A non-transitory computer-readable storage medium comprising instructions that upon execution in a processor cause the processor to:

encode a set of frames of digital multimedia data in a first data stream;

encode digital null data for a period following the set of frames of multimedia data in a second data stream;

modulate, with a multiplexer, the encoded set of frames of the first stream and the null data of the second stream into a combined stream, wherein modulating the null data creates a null interval over the period, and wherein the null interval is defined to correspond to a transmitter quieting interval during which a transmitter refrains from transmitting any data;

transmit the encoded set of frames of the combined stream via the transmitter;

blank the transmitter during the null interval of the combined stream, wherein the instructions that cause the processor to blank the transmitter during the null interval further cause the processor to;

refrain from transmitting data via the transmitter during the transmitter quieting interval corresponding to the null interval; and

cause a sensor unit to perform a sensing operation while the transmitter blanks during the transmitter quieting interval corresponding to the null interval wherein the one or more null intervals are not less than six milliseconds to provide a sufficient time for reliable spectrum sensing to be performed.

29. The computer-readable storage medium of claim 28, wherein the null data causes blanking of the transmitter.

30. The computer-readable storage medium of claim 28, wherein the set of frames comprise one of:

a set of audio frames,

a set of video frames, and

a combined set of audio frames and video frames.

31. The computer-readable storage medium of claim 28, wherein the null data comprises a set of packets having all zeros within packet payloads of the set of packets.

32. The computer-readable storage medium of claim 28, wherein the instructions cause the sensor unit to sense for other wireless signals at one or more particular frequencies.

33. The computer-readable storage medium of claim 32, wherein the instructions cause the sensor unit to sense for a licensed signal at the one or more particular frequencies.

34. The computer-readable storage medium of claim 32, wherein the instructions cause the transmitter to switch to a different frequency upon the sensor unit sensing another wireless signal at the one or more particular frequencies.

35. The computer-readable storage medium of claim 32, wherein the instructions cause the sensor unit periodically repeat sensing operations during periodically repeating null intervals.