Systems and methods for communication of channel state information

• US 9,882,624 B2
• Filed: 09/28/2011
• Issued: 01/30/2018
• 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
• Application Number:
  US13/247,062
• Publication Number:
  US 20120257605A1
• Time in Patent Office: 2,316 Days
• Field of Search: 370203, 370204-215, 370229-240, 370310-394, 3703951, 3703953, 3703954, 37039541, 37039542, 3703955, 37039552, 370431-529
• 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 receiver configured to receive a message indicating that channel state information is requested;

a processing system configured to generate a communication comprising a field for indicating if a first segment of channel state information of a plurality of segments of channel state information is being transmitted and a second field including three bits, wherein the field comprises one bit, and wherein the bit of the field has a value of “

0” and

the bits of the second field have a value of “

111”

if the communication does not include channel state information; and

a transmitter configured to transmit the communication.

2. The apparatus of claim 1, wherein the bit has a value of “

1”

if a first segment of channel state information is included in the communication.

9. The apparatus of claim 1, wherein the communication comprises the channel state information, and wherein the communication further comprises an indicator signifying whether the channel state information was calculated for single user or multi-user.

3. An apparatus for wireless communication, comprising:

a receiver configured to receive a message indicating that channel state information is requested;

a processing system configured to generate a communication comprising a first field for indicating if a first segment of channel state information of a plurality of segments of channel state information is being transmitted and a second field for indicating a number of segments of channel state information remaining to be transmitted, wherein the first field and the second field indicate null channel state information is included in the communication; and

a transmitter configured to transmit the communication.

4. The apparatus of claim 3, further comprising:

at least one antenna, wherein the receiver is configured to receive the message via the at least one antenna, wherein the apparatus is configured as an access terminal.

5. An apparatus for wireless communication, comprising:

a receiver configured to receive a message indicating that channel state information is requested;

a processing system configured to generate a communication comprising a first field for indicating if a first segment of channel state information of a plurality of segments of channel state information is being transmitted and a second field for indicating a number of segments of channel state information remaining to be transmitted, 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 transmitter configured to transmit the configuration.

6. The apparatus of claim 5, further comprising:

at least one antenna, wherein the receiver is configured to receive the message via the at least one antenna, wherein the apparatus is configured as an access terminal.

7. An apparatus for wireless communication, comprising:

a receiver configured to receive a message indicating that channel state information is requested;

a processing system configured to generate a communication comprising a first field for indicating if a first segment of channel state information of a plurality of segments of channel state information is being transmitted and a second field for indicating a number of segments of channel state information remaining to be transmitted, wherein the second field signifies a number of segments of channel state information remaining to be transmitted 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 transmitter configured to transmit the configuration.

8. The apparatus of claim 7, further comprising:

at least one antenna, wherein the receiver is configured to receive the message via the at least one antenna, wherein the apparatus is configured as an access terminal.

10. A method of wireless communication, comprising:

receiving a message indicating that channel state information is requested;

generating a communication comprising a field for indicating if a first segment of channel state information of a plurality of segments of channel state information is being transmitted and a second field including three bits, wherein the field comprises one bit, and wherein the bit of the field has a value of “

0” and

the bits of the second field have a value of “

111”

if the communication does not include channel state information; and

transmitting the communication.

11. The method of claim 10, wherein the bit has a value of “

1”

if a first segment of channel state information is included in the communication.

15. The method of claim 10, wherein the communication comprises the channel state information, and wherein the communication further comprises an indicator signifying whether the channel state information was calculated for single user or multi-user.

12. A method of wireless communication, comprising:

receiving a message indicating that channel state information is requested;

generating a communication comprising a first field for indicating if a first segment of channel state information of a plurality of segments of channel state information is being transmitted and a second field for indicating a number of segments of channel state information remaining to be transmitted, wherein the first field and the second field indicate null channel state information is included in the communication; and

transmitting the communication.

13. A method of wireless communication, comprising:

receiving a message indicating that channel state information is requested;

generating a communication comprising a first field for indicating if a first segment of channel state information of a plurality of segments of channel state information is being transmitted and a second field for indicating a number of segments of channel state information remaining to be transmitted, 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

transmitting the communication.

14. A method of wireless communication, comprising:

receiving a message indicating that channel state information is requested;

generating a communication comprising a first field for indicating if a first segment of channel state information of a plurality of segments of channel state information is being transmitted and a second field for indicating a number of segments of channel state information remaining to be transmitted, wherein the second field signifies a number of segments of channel state information remaining to be transmitted 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

transmitting the communication.

16. An apparatus for wireless communication, comprising:

means for receiving a message indicating that channel state information is requested;

means for generating a communication comprising a field for indicating if a first segment of channel state information of a plurality of segments of channel state information is being transmitted and a second field including three bits, wherein the field comprises one bit, and wherein the bit of the field has a value of “

0” and

the bits of the second field have a value of “

111”

if the communication does not include channel state information; and

means for transmitting the communication.

17. The apparatus of claim 16, wherein the bit has a value of “

1”

if a first segment of channel state information is included in the communication.

18. The apparatus of claim 16, wherein the communication comprises a second field for indicating a number of segments of channel state information remaining to be transmitted, and wherein the field and the second field indicate null channel state information is included in the communication.

19. The apparatus of claim 16, wherein the communication comprises a second field for indicating a number of segments of channel state information remaining to be transmitted, and wherein the field and the second field indicate null channel state information is included in the communication if the 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.

20. The apparatus of claim 16, wherein the communication comprises a second field for indicating a number of segments of channel state information remaining to be transmitted, and wherein the second field signifies a number of segments of channel state information remaining to be transmitted 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.

21. The apparatus of claim 16, wherein the communication comprises the channel state information, and wherein the communication further comprises an indicator signifying whether the channel state information was calculated for single user or multi-user.

22. An access terminal, comprising:

at least one antenna;

a receiver configured to receive, via the at least one antenna, a message indicating that channel state information is requested;

a processing system configured to generate a communication comprising a field for indicating if a first segment of channel state information of a plurality of segments of channel state information is being transmitted and a second field including three bits, wherein the field comprises one bit, and wherein the bit of the field has a value of “

0” and

the bits of the second field have a value of “

111”

if the communication does not include channel state information; and

a transmitter configured to transmit the communication.