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US-20260128833-A1 - LOW OVERHEAD CSI-RS TRANSMISSION AND CSI FEEDBACK FRAMEWORK

US20260128833A1US 20260128833 A1US20260128833 A1US 20260128833A1US-20260128833-A1

Abstract

A user equipment (UE) includes a transceiver configured to receive, from a base station (BS), a sparse channel state information (CSI)-reference signal (RS) resource configuration, and receive, from the BS, a CSI-RS based on the sparse CSI-RS resource configuration. The UE also includes a processor operably coupled to the transceiver. The processor is configured to generate, based on the sparse CSI-RS resource configuration, sparse CSI based on measurement of the received CSI-RS.

Inventors

  • Xinliang Zhang
  • Young Han Nam

Assignees

  • SAMSUNG ELECTRONICS CO., LTD.

Dates

Publication Date
20260507
Application Date
20251023

Claims (20)

  1. 1 . A user equipment (UE) comprising: a transceiver configured to: receive, from a base station (BS), a sparse channel state information (CSI)-reference signal (RS) resource configuration; and receive, from the BS, a CSI-RS based on the sparse CSI-RS resource configuration; and a processor operably coupled to the transceiver, the processor configured to generate, based on the sparse CSI-RS resource configuration, sparse CSI based on measurement of the received CSI-RS.
  2. 2 . The UE of claim 1 , wherein: the sparse CSI-RS resource configuration includes a patch configuration, and the patch configuration indicates at least one of a patch size, a patch shape, a shape index, and a patch indexing methodology.
  3. 3 . The UE of claim 1 , wherein: the sparse CSI-RS resource configuration includes a mapping pattern configuration, and the mapping pattern configuration indicates at least one of a mapping pattern type, a density, a mapping pattern size, and an index of orthogonal mapping patterns.
  4. 4 . The UE of claim 1 , wherein: the sparse CSI-RS resource configuration includes a patch to physical resource mapping configuration, and the patch to physical resource mapping configuration maps CSI-RS ports associated with a patch to a single orthogonal frequency division multiplexing (OFDM) symbol.
  5. 5 . The UE of claim 1 , wherein: the sparse CSI-RS resource configuration includes a patch to physical resource mapping configuration, and the patch to physical resource mapping configuration maps CSI-RS ports associated with a patch to a plurality of orthogonal frequency division multiplexing (OFDM) symbols.
  6. 6 . The UE of claim 1 , wherein: the sparse CSI-RS resource configuration includes a patch to physical resource mapping configuration, and the patch to physical resource mapping configuration maps CSI-RS ports associated with a patch to one or more code division multiplexing (CDM) groups.
  7. 7 . The UE of claim 1 , wherein: the processor is further configured to: in-paint CSI missing from the sparse CSI via a masked auto encoder (MAE) to generate full-frequency CSI from the CSI-RS; and use a Type-I or Type-II codebook to generate a full-frequency CSI report based on the full-frequency CSI; and the transceiver is further configured to transmit the full-frequency CSI report to the BS.
  8. 8 . The UE of claim 1 , wherein: the processor is further configured to: in-paint CSI missing from the sparse CSI via a masked auto encoder (MAE) to generate full-frequency CSI from the CSI-RS; and use a compression auto encoder (CAE) to generate a full-frequency CSI report based on the full-frequency CSI; and the transceiver is further configured to transmit the full-frequency CSI report to the BS.
  9. 9 . The UE of claim 1 , wherein: the processor is further configured to use a Type-I or Type-II codebook to generate a sparse CSI report based on the sparse CSI; and the transceiver is further configured to transmit the sparse CSI report to the BS.
  10. 10 . The UE of claim 1 , wherein: the processor is further configured to use a compression auto encoder (CAE) to generate a sparse CSI report based on the sparse CSI; and the transceiver is further configured to transmit the sparse CSI report to the BS.
  11. 11 . A base station (BS) comprising: A processor configured to generate a sparse channel state information (CSI)-reference signal (RS) resource configuration; and a transceiver operably coupled to the processor, the transceiver configured to: transmit, to a user equipment (UE), the sparse CSI-RS resource configuration; transmit, to the UE, a CSI-RS based on the sparse CSI-RS resource configuration; and receive, from the UE, a CSI report based on the CSI-RS.
  12. 12 . The BS of claim 11 , wherein: the sparse CSI-RS resource configuration includes a patch configuration, and the patch configuration indicates at least one of a patch size, a patch shape, a shape index, and a patch indexing methodology.
  13. 13 . The BS of claim 11 , wherein: the sparse CSI-RS resource configuration includes a mapping pattern configuration, and the mapping pattern configuration indicates at least one of a mapping pattern type, a density, a mapping pattern size, and an index of orthogonal mapping patterns.
  14. 14 . The BS of claim 11 , wherein: the sparse CSI-RS resource configuration includes a patch to physical resource mapping configuration, and the patch to physical resource mapping configuration maps CSI-RS ports associated with a patch to a single orthogonal frequency division multiplexing (OFDM) symbol.
  15. 15 . The BS of claim 11 , wherein: the sparse CSI-RS resource configuration includes a patch to physical resource mapping configuration, and the patch to physical resource mapping configuration maps CSI-RS ports associated with a patch to a plurality of orthogonal frequency division multiplexing (OFDM) symbols.
  16. 16 . The BS of claim 11 , wherein: the sparse CSI-RS resource configuration includes a patch to physical resource mapping configuration, and the patch to physical resource mapping configuration maps CSI-RS ports associated with a patch to one or more code division multiplexing (CDM) groups.
  17. 17 . The BS of claim 11 , wherein: the CSI report is a full-frequency CSI report; the full-frequency CSI report is generated by the UE using a Type-I or Type-II codebook; and the processor is further configured to reconstruct full-frequency CSI from the full-frequency CSI report using the Type-I or Type-II codebook.
  18. 18 . The BS of claim 11 , wherein: the CSI report is a full-frequency CSI report; the full-frequency CSI report is generated by the UE using a compression auto encoder (CAE); and the processor is further configured to reconstruct full-frequency CSI from the full-frequency CSI report using a CSI decompressor.
  19. 19 . The BS of claim 11 , wherein: the CSI report is a sparse CSI report; the sparse CSI report is generated by the UE using a Type-I or Type-II codebook; and the processor is further configured to: reconstruct sparse CSI from the sparse CSI report using a CSI decompressor; and in-paint CSI missing from the sparse CSI via a masked auto encoder (MAE) to generate full-frequency CSI from the sparse CSI.
  20. 20 . The BS of claim 11 , wherein: the CSI report is a sparse CSI report; the sparse CSI report is generated by the UE using a compression auto encoder (CAE); and the processor is further configured to: reconstruct sparse CSI from the sparse CSI report using a CSI decompressor; and in-paint CSI missing from the sparse CSI via a masked auto encoder (MAE) to generate full-frequency CSI from the sparse CSI.

Description

CROSS-REFERENCE TO RELATED APPLICATION(S) AND CLAIM OF PRIORITY This application claims priority under 35 U.S.C. § 119(e) to U.S. Provisional Patent Application No. 63/716,529 filed on Nov. 5, 2024, U.S. Provisional Patent Application No. 63/724,134 filed on Nov. 22, 2024, U.S. Provisional Patent Application No. 63/758,092 filed on Feb. 13, 2025, U.S. Provisional Patent Application No. 63/789,037 filed on Apr. 15, 2025, and U.S. Provisional Patent Application No. 63/852,399 filed on Jul. 28, 2025. The above-identified provisional patent applications are hereby incorporated by reference in their entirety. TECHNICAL FIELD This disclosure relates generally to wireless networks. More specifically, this disclosure relates to low overhead channel state information (CSI)-reference signal (RS) transmission and CSI feedback frameworks. BACKGROUND The demand of wireless data traffic is rapidly increasing due to the growing popularity among consumers and businesses of smart phones and other mobile data devices, such as tablets, “note pad” computers, net books, eBook readers, and machine type of devices. In order to meet the high growth in mobile data traffic and support new applications and deployments, improvements in radio interface efficiency and coverage are of paramount importance. To meet the demand for wireless data traffic having increased since deployment of 4G communication systems, and to enable various vertical applications, 5G communication systems have been developed and are currently being deployed. The enablers for the 5G/NR mobile communications include massive antenna technologies, from legacy cellular frequency bands up to high frequencies, to provide beamforming gain and support increased capacity, new waveforms (e.g., new radio access technologies (RATs)) to flexibly accommodate various services/applications with different requirements, new multiple access schemes to support massive connections, etc. SUMMARY This disclosure provides apparatuses and methods for low overhead CSI-RS transmission and CSI feedback. In one embodiment, a user equipment (UE) is provided. The UE includes a transceiver configured to receive, from a base station (BS), a sparse channel state information CSI-RS resource configuration, and receive, from the BS, a CSI-RS based on the sparse CSI-RS resource configuration. The UE also includes a processor operably coupled to the transceiver. The processor is configured to generate, based on the sparse CSI-RS resource configuration, sparse CSI based on measurement of the received CSI-RS. In another embodiment, A BS is provided. The BS includes a processor configured to generate a sparse CSI-RS resource configuration. The BS also includes a transceiver operably coupled to the processor. The transceiver is configured to transmit, to a UE, the sparse CSI-RS resource configuration, transmit, to the UE, a CSI-RS based on the sparse CSI-RS resource configuration, and receive, from the UE, a CSI report based on the CSI-RS. Other technical features may be readily apparent to one skilled in the art from the following figures, descriptions, and claims. Before undertaking the DETAILED DESCRIPTION below, it may be advantageous to set forth definitions of certain words and phrases used throughout this patent document. The term “couple” and its derivatives refer to any direct or indirect communication between two or more elements, whether or not those elements are in physical contact with one another. The terms “transmit,” “receive,” and “communicate,” as well as derivatives thereof, encompass both direct and indirect communication. The terms “include” and “comprise,” as well as derivatives thereof, mean inclusion without limitation. The term “or” is inclusive, meaning and/or. The phrase “associated with,” as well as derivatives thereof, means to include, be included within, interconnect with, contain, be contained within, connect to or with, couple to or with, be communicable with, cooperate with, interleave, juxtapose, be proximate to, be bound to or with, have, have a property of, have a relationship to or with, or the like. The term “controller” means any device, system or part thereof that controls at least one operation. Such a controller may be implemented in hardware or a combination of hardware and software and/or firmware. The functionality associated with any particular controller may be centralized or distributed, whether locally or remotely. The phrase “at least one of,” when used with a list of items, means that different combinations of one or more of the listed items may be used, and only one item in the list may be needed. For example, “at least one of: A, B, and C” includes any of the following combinations: A, B, C, A and B, A and C, B and C, and A and B and C. Moreover, various functions described below can be implemented or supported by one or more computer programs, each of which is formed from computer readable program code and embodied in a computer readable medium. The t