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WO-2026090891-A1 - CHANNEL INFORMATION FEEDBACK METHOD AND APPARATUS

WO2026090891A1WO 2026090891 A1WO2026090891 A1WO 2026090891A1WO-2026090891-A1

Abstract

A method of wireless communication includes determining, by a first wireless device, to use a codebook set for channel feedback; selecting, by the first wireless device, a codeword from the codebook; and transmitting, by the first wireless device, a feedback signal indicating the codeword to a second wireless device. Codewords in the codebook include multiple codeword blocks, at least one codeword block, G, is represented as:(I) where, f represents a function. (II) represents a matrix or a vector, D k represents a vector or a matrix, K is an integer greater than or equal to 1, k is an integer, with k = 1 to K; and wherein elements of (II) are related to a quadratic power of an index.

Inventors

  • JIAN, Mengnan
  • CHEN, YIJIAN
  • ZHAO, YAJUN

Assignees

  • ZTE CORPORATION

Dates

Publication Date
20260507
Application Date
20241030

Claims (20)

  1. A method of digital communication, comprising: determining, by a first wireless device, to use a codebook set for channel feedback; selecting, by the first wireless device, a codeword from the codebook; and transmitting, by the first wireless device, a feedback signal indicating the codeword to a second wireless device, wherein codewords in the codebook include multiple codeword blocks, at least one codeword block, G, is represented as: where, f represents a function. represents a matrix or a vector, D k represents a vector or a matrix, K is an integer greater than or equal to 1, k is an integer, with k = 1 to K; and wherein elements of are related to a quadratic power of an index.
  2. A method of digital communication, comprising: receiving, by a second wireless device, a feedback signal from a first wireless device, wherein the feedback signal includes a channel feedback using a codeword from a codebook, wherein codewords in the codebook include multiple codeword blocks, at least one codeword block, G, is represented as: where, f represents a function, represents a matrix or a vector, D k is a vector or a matrix, K is an integer greater than or equal to 1, k is an integer, with k = 1 to K; and wherein elements of are related to a quadratic power of an index.
  3. The method of any of claims 1-2, wherein the codebook is a result of: left-multiplying a second matrix corresponding to a legacy Type I or Type II codebook, wherein the second matrix is a diagonal matrix, with phase of each entry having a quadratic form of (an+b) , where a and b are real numbers and n is an index.
  4. The method of claim 3, wherein the codebook is a result of: taking a dot-product of each column of a second matrix with a vector, where phase of each entry having a quadratic form of (an+b) , where a and b are real numbers and n is an index, and wherein the second matrix corresponds to a legacy Type I or Type II codebook.
  5. The method of claim 4, wherein (a) when is a vector, nth element is related to (a*n+b) ^2, where a is a non-zero real number and b is a real number; and when is a matrix, phases of elements in n-th row/column are related to (a*n+b) ^2, or (b) when is a vector, a phase of n-th element is related to (a* (n-Nt) +b) ^2, and when is a matrix, phases of the elements in the n-th row/column are related to (a* (n-Nt) +b) ^2.
  6. The method of claim 1, wherein, Nt represents a number of antennas or a number of antenna ports of the second wireless device.
  7. The method of CLAIM 1, wherein the second matrix or the second vector is constructed using a codeword generation model that uses input parameters {u 1, k , u 2, k , n, n 2 } , wherein {u 1, k , u 2, k } is indicated by a precoding matrix indicator (PMI) .
  8. The method of claim 7, wherein elements of the first matrix or the first vector are generated as:
  9. The method of claim 7, wherein elements of the first matrix or the first vector are generated as: or
  10. The method of any of claims 7-9, wherein elements of the second matrix or the second vector are generated according to a legacy protocol.
  11. The method of claims 7-10, wherein the first matrix or the first vector is represented as wherein is and l, l’, m’ m’ and n are integer variables.
  12. The method of any of claims 7-11, wherein u 1, 1 =0, u 1, 2 =0.
  13. The method of claims 9-12, wherein are the same for all values of k.
  14. The method of claims 1-2 above, wherein the first matrix is constructed using codewords with input parameters and coefficients {β 1, k , β 2, k , β 3, k , β 4, k , β 5, k } in a codeword generation model are determined according to the codeword generation parameters fed back by the terminal {t 1, k , t 2, k , t 3, k } .
  15. The method of any of claims 1-14, wherein the second matrix or second vector is generated according to a legacy protocol.
  16. The method of claims 1-2, wherein are the same for all values of k.
  17. The method of claims 1-2, wherein the first matrix is constructed using codewords with input parameters and coefficients {β 1, k , β 2, k , β 3, k , β 4, k } in a codeword generation model are determined according to the codeword generation parameters fed back by the terminal {t 1, k , t 2, k , t 3, k } .
  18. The method of any of claims 1-17, wherein the first matrix or the first vector is generated as a product of subvectors of the first matrix of the first vector or constructed according to a legacy protocol.
  19. An apparatus for wireless communication, comprising one or more processors configured to cause the apparatus to implement a method recited in any one or more of claims 1-18.
  20. A computer-readable medium having code stored thereon, the code, upon execution by one or more processors of an apparatus, causing the apparatus to implement a method recited in any one or more of claims 1-19.

Description

CHANNEL INFORMATION FEEDBACK METHOD AND APPARATUS TECHNICAL FIELD This patent document is directed to digital communications. BACKGROUND Mobile communication technologies are moving the world toward an increasingly connected and networked society. The rapid growth of mobile communications and advances in technology have led to greater demand for capacity and connectivity. Other aspects, such as energy consumption, device cost, spectral efficiency, and latency are also important to meeting the needs of various communication scenarios. Various techniques, including new ways to provide higher quality of service, longer battery life, and improved performance are being discussed. SUMMARY This patent document describes, among other things, techniques for managing configuration and transmission of common signals in a wireless network. In one example aspect, a method for wireless communication includes determining, by a first wireless device, to use a codebook set for channel feedback, selecting, by the first wireless device, a codeword from the codebook, and transmitting, by the first wireless device, a feedback signal indicating the codeword to a second wireless device. The codewords in the codebook include multiple codeword blocks, at least one codeword block, G, is represented as: where, f represents a function. represents a matrix or a vector, Dkrepresents a vector or a matrix, K is an integer greater than or equal to 1, k is an integer, with k = 1 to K. Elements ofare related to a quadratic power of an index. In another example aspect, a method for wireless communication includes receiving, by a second wireless device, a feedback signal from a first wireless device, wherein the feedback signal includes a channel feedback using a codeword from a codebook. The codewords in the codebook include multiple  codeword blocks, at least one codeword block, G, is represented as: where, f represents a function. represents a matrix or a vector, Dkrepresents a vector or a matrix, K is an integer greater than or equal to 1, k is an integer, with k = 1 to K. Elements ofare related to a quadratic power of an index. The channel feedback is used for performing further wireless operations. In another example aspect, a communication apparatus is disclosed. The apparatus includes at least one processor that is configured to cause the communication apparatus above-described method. In yet another example aspect, a computer-program storage medium is disclosed. The computer-program storage medium includes code stored thereon. The code, when executed by at least one processor, causes the at least one processor to cause a communication apparatus to implement a described method. These, and other, aspects are described in the present document. BRIEF DESCRIPTION OF DRAWINGS FIGS. 1A-1E are resource maps showing examples of vector selection in a multi-beam scenario. FIG. 2 is a resource map showing an example of vector selection in a multi-beam scenario. FIG. 3 is a resource map showing an example of vector selection in a multi-beam scenario. FIG. 4 is a resource map showing an example of vector selection in a multi-beam scenario. FIG. 5 illustrates an example of a wireless communication network. FIG. 6 is a block diagram representation of a portion of a hardware platform in accordance with one or more embodiments of the present technology can be applied. FIGS. 7A-7B are flowcharts for wireless communication method examples. DETAILED DESCRIPTION Section headings are used in the present document only to improve readability and do not limit scope of the disclosed embodiments and techniques in each section to only that section. Furthermore, some embodiments are described with reference to Third Generation Partnership Project (3GPP) Fifth  Generation (5G) New Radio (NR) or Sixth Generation (6G) standard for ease of understanding and the described technology may be implemented in different wireless system that implement protocols other than the NR or 6G protocol. 1. Initial discussion With the continuous development of wireless communications, the demand for arrays with large-scale unit antennas or elements is increasing, which leads to the continuous reduction of the boundary between the near field and the far field, and the near-field effect is becoming more prominent. The channel characteristics change significantly in the near-field scenario. The channels at different distances with the same angle are obviously different. Channel modeling has developed from angle domain modeling to multi-domain modeling. The study of near-field channels cannot be satisfied with the assumption that the distance is extremely large or that the distance parameter has almost no effect on the channel. The modeling of points at different spatial positions needs to take the distance factor as an important design factor. Since the traditional DFT (discrete Fourier transform) codebook only focuses on the parameters of a single angle dimension, the t