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EP-4740314-A1 - METHODS, ARCHITECTURES, APPARATUSES AND SYSTEMS FOR DIFFERENTIAL CHANNEL STATE INFORMATION COMPRESSION AND FEEDBACK ON MISMATCH DETECTION

EP4740314A1EP 4740314 A1EP4740314 A1EP 4740314A1EP-4740314-A1

Abstract

A method, implemented in a wireless transmit and receive unit (WTRU), may include receiving one or more reference signals, selecting a first codebook-based precoding matrix based on the one or more reference signals and determining a second precoding matrix based on the one or more reference signals. The method may include determining a differential precoding matrix based on the first codebook-based precoding matrix and the second precoding matrix. The method may include determining a compressed differential precoding matrix based on the differential precoding matrix. The method may include transmitting feedback information indicating the compressed differential precoding matrix.

Inventors

  • TAN, AHMET SERDAR
  • TOOHER, PATRICK
  • LUTCHOOMUN, Tejaswinee
  • BELURI, MIHAELA

Assignees

  • InterDigital Patent Holdings, Inc.

Dates

Publication Date
20260513
Application Date
20240628

Claims (20)

  1. 1. A method implemented in a wireless transmit/receive unit (WTRU), the method comprising: receiving one or more reference signals; selecting a first codebook-based precoding matrix based on the one or more reference signals and determining a second precoding matrix based on the one or more reference signals; determining a differential precoding matrix based on the selected first codebook-based precoding matrix and the determined second precoding matrix; determining a compressed differential precoding matrix based on the differential precoding matrix; and transmitting feedback information indicating the compressed differential precoding matrix.
  2. 2. The method of claim 1, comprising determining side information based on the differential precoding matrix and the first codebook-based precoding matrix.
  3. 3. The method of claim 2, wherein the side information is representative of any of a magnitude and a relative magnitude of an autoencoder input.
  4. 4. The method of any of claims 2 to 3, wherein the feedback information indicates the side information.
  5. 5. The method of any of claims 1 to 4, comprising receiving configuration information indicating to use differential channel state information (CSI) compression.
  6. 6. The method of claim 5, wherein the configuration information indicates any of (i) a payload size for codebook-based precoding matrix feedback, (ii) a payload size for differential CSI compression feedback, (iii) any of uplink resources and resource types associated with different parts of a CSI report, and (iv) one or more rules for the WTRU to determine a reporting configuration.
  7. 7. The method of any of claims 1 to 6, wherein the first codebook-based precoding matrix is a lower resolution precoding matrix, and the second precoding matrix is a higher resolution precoding matrix.
  8. 8. The method of any of claims 1 to 7, wherein the first codebook-based precoding matrix corresponds to a wideband channel.
  9. 9. The method of any of claims 1 to 8, wherein the second precoding matrix corresponds to a subband.
  10. 10. The method of any of claims 1 to 9, comprising determining a first channel quality indicator associated with the first codebook-based precoding matrix and a second channel quality indicator associated with the second precoding matrix.
  11. 11. The method of claim 10, wherein the feedback information indicates any of the first channel quality indicator and the second channel quality indicator.
  12. 12. The method of claim 10, wherein the feedback information indicates the first codebook-based precoding matrix.
  13. 13. The method of claim 10, wherein a first part of the feedback information is transmitted in response to a first differential CSI request, and wherein the first part of the feedback information indicates the first channel quality indicator, the second channel quality indicator and the first codebook-based precoding matrix.
  14. 14. The method of claim 13, wherein a second part of the feedback information is transmitted in response to a second differential CSI request, and wherein the second part of the feedback information indicates the compressed differential precoding matrix.
  15. 15. A wireless transmit/receive unit (WTRU) comprising circuitry, including any of a transmitter, a receiver, a processor, and a memory, configured to: receive one or more reference signals; select a first codebook-based precoding matrix based on the one or more reference signals and determine a second precoding matrix based on the one or more reference signals; determine a differential precoding matrix based on the first codebook-based precoding matrix and the second precoding matrix; determining a compressed differential precoding matrix based on the differential precoding matrix; and transmitting feedback information indicating the compressed differential precoding matrix.
  16. 16. The WTRU of claim 15, wherein the circuitry is configured to determine side information based on the differential precoding matrix and the first codebook-based precoding matrix.
  17. 17. The WTRU of claim 16, wherein the feedback information indicates the side information.
  18. 18. The WTRU of any of claims 15 to 17, wherein the circuitry is configured to receive configuration information indicating to use differential channel state information (CSI) compression.
  19. 19. The WTRU of claim 18, wherein the configuration information indicates any of (i) a payload size for codebook-based precoding matrix feedback, (ii) a payload size for differential CSI compression feedback, (iii) any of uplink resources and resource types associated with different parts of a CSI report, and (iv) one or more rules for the WTRU to determine a reporting configuration.
  20. 20. The WTRU of any of claims 15 to 19, wherein the first codebook-based precoding matrix is a lower resolution precoding matrix, and the second precoding matrix is a higher resolution precoding matrix.

Description

METHODS, ARCHITECTURES, APPARATUSES AND SYSTEMS FOR DIFFERENTIAL CHANNEL STATE INFORMATION COMPRESSION AND FEEDBACK ON MISMATCH DETECTION CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application claims the benefit of U.S. Patent Application Nos. 63/525,009, filed July 5, 2023; and 63/536,988, filed September 7, 2023, each of which is incorporated herein by reference in its entirety. TECHNICAL FIELD [0002] The present disclosure is generally directed to the fields of communications, software and encoding, including methods, architectures, apparatuses, and systems directed to differential channel state information (CSI) compression and feedback. BACKGROUND [0003] Codebook-based precoding with feedback information transmission may be used in wireless systems. Performance of codebook-based precoding may be limited due to its finite number of precoding vectors. Embodiments described herein have been designed with the foregoing in mind. BRIEF SUMMARY [0004] Methods, architectures, apparatuses, and systems directed to differential channel state information (CSI) compression and feedback are described herein. In an embodiment, a first method implemented in a wireless transmit/receive unit (WTRU) is described herein. The first method may include receiving one or more reference signals. The first method may include determining (e.g., selecting) a first codebook-based precoding matrix and determining a second precoding matrix based on the one or more reference signals. The first method may include determining a differential CSI (e.g., differential precoding matrix) based on the first codebookbased precoding matrix and the second precoding matrix. The first method may include determining a compressed differential CSI (e.g., compressed differential precoding matrix) based on the differential CSI (e.g., differential precoding matrix). The first method may include transmitting feedback information indicating the compressed differential CSI (e.g., compressed differential precoding matrix). [0005] In an embodiment, a second method implemented in a WTRU is described herein. The second method may include receiving one or more reference signals and determining a second precoding matrix based on the one or more reference signals. The second method may include determining one or more parameters for codebook-based precoding matrix and differential CSI compression based on the second precoding matrix. The second method may include determining a first precoding matrix based on the one or more reference signals and the determined one or more parameters. The second method may include determining a compressed differential CSI (e.g., compressed differential precoding matrix) based on the first precoding matrix, the second precoding matrix and the determined one or more parameters. The second method may include transmitting feedback information indicating the compressed differential CSI (e.g., compressed differential precoding matrix) and the determined one or more parameters. [0006] In an embodiment, a third method implemented in a WTRU is described herein. The third method may include receiving a first reference signal at a first time instance at a beginning of a time window and determining a first precoding matrix based on the first reference signal. The third method may include receiving a second reference signal at a second time instance within the time window and determining a second precoding matrix based on the second reference signal. The third method may include determining a second compressed differential CSI (e.g., compressed differential precoding matrix) based on the first precoding matrix and the second precoding matrix. The third method may include transmitting first feedback information at a first reporting occasion associated with the first time instance, and the first feedback information may indicate the first precoding matrix. The third method may include transmitting second feedback information at a second reporting occasion associated with the second time instance, and the second feedback information may indicate the second compressed differential CSI (e.g., compressed differential precoding matrix). [0007] In an embodiment, a fourth method implemented in a WTRU is described herein. The fourth method may include receiving a plurality of reference signals from a plurality of network elements. The fourth method may include determining at least one first precoding matrix for at least one network element of the plurality of network elements and determining a plurality of second precoding matrices for the plurality of network elements based on the plurality of reference signals. The fourth method may include determining a plurality of differential CSI elements based on the at least one first precoding matrix and the plurality of second precoding matrices. The fourth method may include determining a jointly compressed differential CSI based on the plurality of differential CSI elements and transmitting feedback