Channel Prediction for Adaptive Channel State Information (CSI) Feedback Overhead Reduction

• US 20200136700A1
• Filed: 10/31/2018
• Published: 04/30/2020
• Est. Priority Date: 10/31/2018
• Status: Abandoned Application

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Bogale, Tadilo Endeshaw, Wang, Xianbin, Au, Kwok Shum, Aboul-Magd, Osama, Suh, Jung Hoon
• Application Number:
  US16/177,005
• Publication Number:
  US 20200136700A1
• Time in Patent Office: Days
• CPC Class Codes: H04B 17/373 Predicting channel quality or other radio frequency [RF] parameters
• CPC Class Codes: H04B 7/0417 Feedback systems
• CPC Class Codes: H04B 7/0452 Multi-user MIMO systems
• CPC Class Codes: H04B 7/0456 Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04B 7/063 Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
• CPC Class Codes: H04B 7/0658 Feedback reduction
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/003 Adaptive formatting arrangements particular to signalling, e.g. variable amount of bits
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365

Abstract

In accordance with embodiments, methods and systems for CSI feedback overhead reduction are disclosed. A receiving device (e.g., a STA) receives a channel sounding packet from a transmitting device (e.g., an AP). The channel sounding packet comprises a preamble for channel state information (CSI) estimation. The receiving device transmits a feedback signal to the transmitting device. The feedback signal comprises feedback information. The feedback information comprises estimated CSI or information associated with a channel prediction error based on the channel prediction error and the estimated CSI. After receiving the feedback signal from the receiving device, the transmitting device beamforms a beam to transmit data to the receiving device based on the feedback information.

Claims

1. A method comprising:

receiving, by a receiving device from a transmitting device, a channel sounding packet comprising a preamble;

generating, by the receiving device, estimated channel state information (CSI) based on the preamble; and

transmitting, by the receiving device to the transmitting device, a feedback signal comprising feedback information, the feedback information comprising one of the estimated CSI or a scaled channel prediction error based on a comparison of information associated with a channel prediction error and information associated with the estimated CSI.

2. The method of claim 1, further comprising:

generating, by the receiving device, predicted CSI based on previous estimated CSI of at least one previous channel sounding packet using a channel prediction algorithm; and

determining, by the receiving device, the channel prediction error based on a difference between the estimated CSI and the predicted CSI.

3. The method of claim 2, wherein the channel prediction algorithm comprises a recursive least squares (RLS) prediction algorithm.

4. The method of claim 1, further comprising:

before the transmitting;

scaling, by the receiving device, the channel prediction error by an error scaling factor to generate the scaled channel prediction error,

encoding, by the receiving device, the scaled channel prediction error to generate a compressed channel prediction error, and

encoding, by the receiving device, the estimated CSI to generate compressed estimated CSI,

wherein the transmitting comprises;

transmitting, by the receiving device, the feedback signal based on a comparison between the compressed channel prediction error and the compressed estimated CSI.

5. The method of claim 4, wherein the feedback information comprises the scaled channel prediction error if a size of the compressed channel prediction error is less than a size of the compressed estimated CSI.

6. The method of claim 4, wherein the feedback information comprises the estimated CSI if a size of the compressed channel prediction error is greater than or equal to a size of the compressed estimated CSI.

7. The method of claim 4, wherein the error scaling factor is equal to 1.

8. The method of claim 4, wherein the error scaling factor is greater than or equal to 0, and the error scaling factor is less than 1, the error scaling factor being determined based on a desired relative channel gain.

9. The method of claim 4, the error scaling factor being determined based on at least one of a maximum power or a minimum modulation order.

10. The method of claim 1, the feedback signal further comprising a feedback information type based on the channel prediction error and the estimated CSI.

11. A method comprising:

transmitting, by a transmitting device to a receiving device, a channel sounding packet comprising a preamble for generating estimated channel state information (CSI);

receiving, by the transmitting device from the receiving device, a feedback signal comprising feedback information, the feedback information comprising one of the estimated CSI or a scaled channel prediction error based on a comparison of information associated with a channel prediction error and information associated with the estimated CSI, the estimated CSI generated based on the preamble; and

beamforming, by the transmitting device, a beam to transmit data to the receiving device based on the feedback information.

12. The method of claim 11, the feedback signal further comprising a feedback information type indicating that the feedback information comprises the estimated CSI, and the beamforming comprising:

beamforming the beam based on the estimated CSI.

13. The method of claim 11, the feedback signal further comprising a feedback information type indicating that the feedback information comprises the scaled channel prediction error, and the beamforming comprising:

determining, by the transmitting device, a channel prediction error based on the scaled channel prediction error,

generating, by the transmitting device, the estimated CSI based on the channel prediction error and predicted CSI, the predicted CSI generated based on previous estimated CSI of at least one previous channel sounding packet using a channel prediction algorithm; and

beamforming, by the transmitting device, the beam based on the estimated CSI.

14. The method of claim 13, wherein the channel prediction algorithm comprises a recursive least squares (RLS) prediction algorithm.

15. The method of claim 11, the feedback signal further comprising a feedback information type in a media access control (MAC) header of the feedback signal.

16. The method of claim 11, the beamforming comprising:

beamforming, by the transmitting device, the beam to transmit the data to the receiving device based on the feedback information and a time discrepancy between when the feedback signal is transmitted by the receiving device and when the feedback signal is received by the transmitting device.

17. A receiving device, comprising:

a processor, and

a non-transitory computer readable storage medium storing programming for execution by the processor, the programming including instructions to;

receive, from a transmitting device, a channel sounding packet comprising a preamble;

generate estimated channel state information (CSI) based on the preamble; and

transmit, to the transmitting device, a feedback signal comprising feedback information, the feedback information comprising one of the estimated CSI or a scaled channel prediction error based on a comparison of information associated with a channel prediction error and information associated with the estimated CSI.

18. The receiving device of claim 17, the programming further including instructions:

generate predicted CSI based on previous estimated CSI of at least one previous channel sounding packet using a channel prediction algorithm; and

determine the channel prediction error based on a difference between the estimated CSI and the predicted CSI.

19. A transmitting device, comprising:

a processor; and

a non-transitory computer readable storage medium storing programming for execution by the processor, the programming including instructions to;

transmit, to a receiving device, a channel sounding packet comprising a preamble for generating estimated channel state information (CSI);

receive, from the receiving device, a feedback signal comprising feedback information, the feedback information comprising one of the estimated CSI or a scaled channel prediction error based on a comparison of information associated with a channel prediction error and information associated with the estimated CSI, the estimated CSI generated based on the preamble; and

beamform a beam to transmit data to the receiving device based on the feedback information.

20. The transmitting device of claim 19, the feedback signal further comprising a feedback information type in a media access control (MAC) header of the feedback signal.