Systems and methods for communication of channel state information

• US 9,825,683 B2
• Filed: 09/22/2014
• Issued: 11/21/2017
• Est. Priority Date: 09/29/2010
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Abraham, Santosh Paul, Merlin, Simone, Vermani, Sameer, Sampath, Hemanth
• Primary Examiner(s): Liu, Jung-Jen
• Application Number:
  US14/492,421
• Publication Number:
  US 20150009899A1
• Time in Patent Office: 1,156 Days
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04B 7/0641 Differential feedback
• CPC Class Codes: H04B 7/0643 Feedback on request
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0028 Formatting
• CPC Class Codes: H04L 1/0039 other detection of signalling, e.g. detection of TFCI explicit signalling H04L1/0046, H04L27/0012 and H04L25/0262 take precedence
• CPC Class Codes: H04L 1/0079 Formats for control data H04L1/16 takes precedence; training sequences H04L25/00 and H04L27/00
• CPC Class Codes: H04L 1/1607 Details of the supervisory signal
• CPC Class Codes: H04L 25/0204 of multiple channels
• CPC Class Codes: H04L 25/021 Estimation of channel covariance
• CPC Class Codes: H04L 25/0248 Eigen-space methods
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0057 Physical resource allocation for CQI
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated

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.

Claims

1. An apparatus for wireless communication, comprising:

a transmitter configured to transmit a request for channel state information;

a receiver configured to receive a communication comprising a first field for indicating if a first segment of channel state information is included in the communication, wherein the communication comprises a second field for indicating a number of segments of channel state information remaining to be received if the field indicates that a first segment of channel state information is included or a value of the second field is less than a maximum number of remaining segments; and

a processing system configured to process the communication based at least in part on the first field and the second field.

2. The apparatus of claim 1, wherein the processing system is configured to determine that the communication has null channel state information based on the first field and the second field.

3. The apparatus of claim 1, wherein the request comprises a first sequence number and the communication comprises a second sequence number, and wherein the processing system is configured to process the communication based on whether the first sequence number matches the second sequence number.

4. The apparatus of claim 3, wherein the request comprises a null data packet announcement.

5. An apparatus for wireless communication, comprising:

a transmitter configured to transmit a request for channel state information;

a receiver configured to receive a communication comprising a first field for indicating if a first segment of channel state information is included in the communication, wherein the communication comprises a second field and wherein the first field and the second field indicate null channel state information is included in the communication if the first field indicates that a first segment of channel state information is not included in the communication and a value of the second field is at least as great as a maximum number of remaining segments; and

a processing system configured to process the communication based at least in part on the first field and the second field.

6. The apparatus of claim 5, further comprising at least one antenna, wherein the transmitter is configured to transmit the request for channel state information via the at least one antenna.

7. A method of wireless communication, comprising:

transmitting a request for channel state information;

receiving a communication comprising a first field for indicating if a first segment of channel state information is included in the communication, wherein the communication comprises a second field for indicating a number of segments of channel state information remaining to be received if the field indicates that a first segment of channel state information is included or a value of the second field is less than a maximum number of remaining segments; and

processing the communication based at least in part on the first field and the second field.

8. The method of claim 7, further comprising determining that the communication has null channel state information based on the first field and the second field.

9. The method of claim 7, wherein the communication comprises a second field for indicating a number of segments of channel state information remaining to be received, and wherein the first field and the second field indicate null channel state information is included in the communication if the first field indicates that a first segment of channel state information is not included in the communication and a value of the second field is at least as great as a maximum number of remaining segments.

10. The method of claim 7, wherein the request comprises a first sequence number and the communication comprises a second sequence number, and further comprising processing the communication based on whether the first sequence number matches the second sequence number.

11. The method of claim 10, wherein the request comprises a null data packet announcement.

12. An access point, comprising:

at least one antenna;

a transmitter configured to transmit, via the at least one antenna, a request for channel state information;

a receiver configured to receive a communication comprising a first field for indicating if a first segment of channel state information is included in the communication, wherein the communication comprises a second field for indicating a number of segments of channel state information remaining to be received if the first field indicates that a first segment of channel state information is included or a value of the second field is less than a maximum number of remaining segments; and

a processing system configured to process the communication based at least in part on the first field and the second field.