Systems and methods for communication of channel state information

Patent metadata

Field	Value
Publication number	US-9813135-B2
Application number	US-201113247023-A
Country	US
Kind code	B2
Filing date	Sep 28, 2011
Priority date	Sep 29, 2010
Publication date	Nov 7, 2017
Grant date	Nov 7, 2017

Abstract

Certain aspects of the present disclosure relate to a technique for communicating Channel State Information (CSI) feedback. In some aspects, the CSI feedback is communicated in a very high throughput (VHT) wireless communications system.

First claim

The invention claimed is:

1. A method for wireless communication, comprising:
receiving a message comprising a null data packet announcement, the null data packet announcement comprising a sequence number identifying the null data packet announcement;
determining channel state information based at least in part on a null data packet associated with the null data packet announcement; and
transmitting a message comprising the sequence number identifying the null data packet announcement and at least one parameter of the determined channel state information.

2. The method of claim 1 , wherein the at least one parameter comprises a number of columns of a matrix representative of the determined channel state information, wherein the transmitted message comprises a field indicating the number, and wherein the field comprises at least 3 bits.

3. The method of claim 2 , wherein the matrix comprises a plurality of Eigen modes, singular vectors, or singular values.

4. The method of claim 1 , wherein the at least one parameter comprises a number of rows of a matrix representative of the determined channel state information, wherein the transmitted message comprises a field indicating the number, and wherein the field comprises at least 3 bits.

5. The method of claim 1 , wherein at least one parameter comprises a grouping of tones, wherein the transmitted message comprises a field indicating that the determined channel state information was determined for the grouping of tones, and wherein the field comprises at least 2 bits.

6. The method of claim 1 , wherein the at least one parameter comprises a bandwidth of the determined channel state information, wherein the transmitted message comprises a field indicating the bandwidth, and wherein the field comprises at least 2 bits.

7. The method of claim 6 , wherein the at least 2 bits indicate that the bandwidth is any one of 20 Megahertz, 40 Megahertz, 80 Megahertz, and 160 Megahertz.

8. The method of claim 1 , wherein the at least one parameter comprises information for indexing into a table indicating how values of the determined channel state information are quantized, wherein the transmitted message comprises a field including the information, and wherein the field comprises 1 bit.

9. The method of claim 1 , wherein the transmission further comprises at least one segment of the determined channel state information.

10. The method of claim 9 , wherein the transmitted message further comprises a field indicating a number of segments of the determined channel state information that have not been transmitted.

11. The method of claim 10 , wherein the field comprises 3 bits.

12. The method of claim 1 , wherein the sequence number is represented by 6 bits.

13. The method of claim 1 , wherein the transmitted message further comprises a field including bits that are reserved.

14. The method of claim 1 , wherein the transmitted message comprises a control field, the control field comprising the sequence number of the null data packet announcement and the at least one parameter of the determined channel state information.

15. An apparatus for wireless communications, comprising:
a receiver configured to receive a message comprising a null data packet announcement, the null data packet announcement comprising a sequence number identifying the null data packet announcement;
a processing system configured to determine channel state information based at least in part on a null data packet associated with the null data packet announcement; and
a transmitter configured to transmit a message comprising the sequence number identifying the null data packet announcement and at least one parameter of the determined channel state information.

16. The apparatus of claim 15 , wherein the at least one parameter comprises a number of columns of a matrix representative of the determined channel state information, wherein the transmitted message comprises a field indicating the number, and wherein the field comprises at least 3 bits.

17. The apparatus of claim 16 , wherein the matrix comprises a plurality of Eigen modes, singular vectors, or singular values.

18. The apparatus of claim 15 , wherein the at least one parameter comprises a number of rows of a matrix representative of the determined channel state information, wherein the transmitted message comprises a field indicating the number, and wherein the field comprises at least 3 bits.

19. The apparatus of claim 15 , wherein the at least one parameter comprises a grouping of tones, wherein the transmitted message comprises a field indicating that the determined channel state information was determined for the grouping of tones, and wherein the field comprises at least 2 bits.

20. The apparatus of claim 15 , wherein the at least one parameter comprises a bandwidth of the determined channel state information, wherein the transmitted message comprises a field indicating the bandwidth, and wherein the field comprises at least 2 bits.

21. The apparatus of claim 20 , wherein the at least 2 bits indicate that the bandwidth is any one of 20 Megaherz, 40 Megaherz, 80 Megaherz, and 160 Megaherz.

22. The apparatus of claim 15 , wherein the at least one parameter comprises information for indexing into a table indicating how values of the determined channel state information are quantized, wherein the transmitted message comprises a field including the information, and wherein the field comprises 1 bit.

23. The apparatus of claim 15 , wherein the transmitter is further configured to transmit at least one segment of the determined channel state information.

24. The apparatus of claim 23 , wherein the transmitted message further comprises a field indicating a number of segments of the determined channel state information that have not been transmitted.

25. The apparatus of claim 24 , wherein the field comprises 3 bits.

26. The apparatus of claim 15 , wherein the sequence number is represented by 6 bits.

27. The apparatus of claim 15 , wherein the transmitted message further comprises a field including bits that are reserved.

28. The apparatus of claim 15 , wherein the transmitted message comprises a control field, the control field comprising the sequence number of the null data packet announcement and the at least one parameter of the determined channel state information.

29. An apparatus for wireless communications, comprising:
means for receiving a message comprising a null data packet announcement, the null data packet announcement comprising a sequence number identifying the null data packet announcement;
means for determining channel state information based at least in part on a null data packet associated with the null data packet announcement; and
means for transmitting a message comprising the sequence number of the null data packet announcement and at least one parameter identifying the determined channel state information.

30. The apparatus of claim 29 , wherein the at least one parameter comprises a number of columns of a matrix representative of the determined channel state information, wherein the transmitted message comprises a field indicating the number, and wherein the field comprises at least 3 bits.

31. The apparatus of claim 30 , wherein the matrix comprises a plurality of Eigen modes, singular vectors, or singular values.

Assignees

• Abraham Santosh Paul
• Merlin Simone
• Vermani Sameer
• Sampath Hemanth
• Qualcomm Inc

Inventors

• Abraham Santosh Paul
• Merlin Simone
• Vermani Sameer
• Sampath Hemanth

Classifications

• H04L5/0053

  Allocation of signalling, i.e. of overhead other than pilot signals · CPC title

• H04B7/0417 Primary

  Feedback systems · CPC title

• H04L1/0025

  Transmission of mode-switching indication · CPC title

• H04L1/0028

  Formatting · CPC title

• H04L1/0026

  Transmission of channel quality indication · CPC title