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US-12621691-B2 - Method and apparatus for channel quality reporting

US12621691B2US 12621691 B2US12621691 B2US 12621691B2US-12621691-B2

Abstract

Apparatuses and methods for channel quality reporting are provided. A method for operating a user equipment (UE) includes receiving a configuration about a channel state information (CSI) report. The configuration includes information about N g >1 groups of CSI reference signal (CSI-RS) ports. The method further includes, based on the configuration, measuring the N g groups of CSI-RS ports, identifying K≥1 hypotheses for the CSI report, and determining the CSI report based on the K hypotheses. The method further includes transmitting the CSI report. The CSI report corresponds to υ≥1 layers.

Inventors

  • Md. Saifur Rahman
  • Eko Onggosanusi

Assignees

  • SAMSUNG ELECTRONICS CO., LTD.

Dates

Publication Date
20260505
Application Date
20230120

Claims (19)

  1. 1 . A user equipment (UE) comprising: a transceiver configured to receive a configuration about a channel state information (CSI) report, the configuration including information about N g >1 groups of CSI reference signal (CSI-RS) ports; and a processor operably coupled to the transceiver, the processor, based on the configuration, configured to: measure the N g groups of CSI-RS ports, identify K≥1 hypotheses for the CSI report, and determine the CSI report based on the K hypotheses, wherein: the transceiver is further configured to transmit the CSI report, the CSI report corresponds to υ≥1 layers, the configuration includes information about a codebook, the codebook includes a first component and a second component, the first component includes P≥2 sets of basis vectors including a first set for spatial domain (SD) and a second set for frequency domain (FD), the second component includes coefficients associated with each basis vector combination (v 1 , v 2 , . . . , v P ), where v k belongs to a k-th set of basis vectors and k=1, . . . , P, and the CSI report includes one or multiple basis vector indicators indicating all or a portion of the first component and one of multiple coefficient indicators indicating all or a portion of the second component.
  2. 2 . The UE of claim 1 , wherein the K hypotheses correspond to a same transmission which is one of a single point transmission (SPT), a non-coherent joint transmission (NCJT), or a coherent joint transmission (CJT), where: SPT corresponds to a CSI for one of the N g groups of CSI-RS ports, NCJT corresponds to a CSI across a multiple of the N g groups of CSI-RS ports such that one group is used for each layer, and CJT corresponds to a CSI across the multiple of the N g groups of CSI-RS ports such that the multiple groups are used for each layer.
  3. 3 . The UE of claim 1 , wherein each of the N g groups of CSI-RS ports is associated with a respective non-zero power (NZP) CSI-RS resource.
  4. 4 . The UE of claim 1 , wherein: to identify the K hypotheses, the processor is further configured to select the K hypotheses from a single point transmission (SPT), a non-coherent joint transmission (NCJT), or a coherent joint transmission (CJT), and the CSI report includes at least one indicator indicating the selected K hypotheses.
  5. 5 . The UE of claim 1 , wherein: the transceiver is further configured to receive information about the K hypotheses via the configuration, a medium access control-control element (MAC-CE), or a downlink control information (DCI), and the processor is further configured to identify the K hypotheses based on the received information.
  6. 6 . The UE of claim 1 , wherein: the processor is further configured to: select Z out of the N g groups, where Z is more than one, and determine the CSI report for the selected Z groups, and the CSI report includes at least one indicator indicating the selected Z groups.
  7. 7 . The UE of claim 1 , wherein: when K>1, the CSI report includes I≥1 indicators from a CSI-RS resource indicator (CRI), a layer indicator (LI), a rank indicator (RI), a precoding matrix indicator (PMI), or a channel quality indicator (CQI), and (i) the I indicators are for each of the K hypotheses or (ii) at least one of the I indicators is for each of the K hypotheses and remaining ones of the I indicators are for one of the K hypotheses.
  8. 8 . The UE of claim 1 , wherein, when P=3: the first component corresponds to 3 sets of basis vectors: the first set for SD, the second set for FD, and a third set for Doppler or time domain (DD/TD), and the second component corresponds to coefficients associated with each basis vector triple (v 1 , v 2 , v 3 )=(a i , b f , c d ), where a i is an i-th basis vector from the first set, b f is a f-th basis vector from the second set, and c d is a d-th basis vector from the third set.
  9. 9 . The UE of claim 1 , wherein a number of CSI-RS ports is the same in all of the N g groups or a number of CSI-RS ports in at least one of the N g groups is different from number of CSI-RS ports in others of the N g groups.
  10. 10 . A base station (BS) comprising: a processor configured to generate a configuration about a channel state information (CSI) report, the configuration including information about N g >1 groups of CSI reference signal (CSI-RS) ports; and a transceiver operably coupled to the processor, the transceiver configured to: transmit the configuration, transmit CSI-RS on the N g groups of CSI-RS ports, and receive the CSI report, wherein: the CSI report corresponds to υ≥1 layers and is based on K≥1 hypotheses, the configuration includes information about a codebook, the codebook includes a first component and a second component, the first component includes P≥2 sets of basis vectors including a first set for spatial domain (SD) and a second set for frequency domain (FD), the second component includes coefficients associated with each basis vector combination (v 1 , v 2 , . . . , v P ), where v k belongs to a k-th set of basis vectors and k=1, . . . , P, and the CSI report includes one or multiple basis vector indicators indicating all or a portion of the first component and one of multiple coefficient indicators indicating all or a portion of the second component.
  11. 11 . The BS of claim 10 , wherein the K hypotheses correspond to a same transmission which is one of a single point transmission (SPT), a non-coherent joint transmission (NCJT), or a coherent joint transmission (CJT), where: SPT corresponds to a CSI for one of the N g groups of CSI-RS ports, NCJT corresponds to a CSI across a multiple of the N g groups of CSI-RS ports such that one group is used for each layer, and CJT corresponds to a CSI across the multiple of the N g groups of CSI-RS ports such that the multiple groups are used for each layer.
  12. 12 . The BS of claim 10 , wherein each of the N g groups of CSI-RS ports is associated with a respective non-zero power (NZP) CSI-RS resource.
  13. 13 . The BS of claim 10 , wherein: the K hypotheses correspond to a single point transmission (SPT), a non-coherent joint transmission (NCJT), or a coherent joint transmission (CJT), and the CSI report includes at least one indicator indicating the K hypotheses.
  14. 14 . The BS of claim 10 , wherein the transceiver is further configured to transmit information about the K hypotheses via the configuration, a medium access control-control element (MAC-CE), or a downlink control information (DCI) to indicate the K hypotheses.
  15. 15 . A method for operating a user equipment (UE), the method comprising: receiving a configuration about a channel state information (CSI) report, the configuration including information about N g >1 groups of CSI reference signal (CSI-RS) ports; based on the configuration: measuring the N g groups of CSI-RS ports; identifying K≥1 hypotheses for the CSI report; and determining the CSI report based on the K hypotheses; and transmitting the CSI report, wherein: the CSI report corresponds to υ≥1 layers, the configuration includes information about a codebook, the codebook includes a first component and a second component, the first component includes P≥2 sets of basis vectors including a first set for spatial domain (SD) and a second set for frequency domain (FD), the second component includes coefficients associated with each basis vector combination (v 1 , v 2 , . . . , v P ), where v k belongs to a k-th set of basis vectors and k=1, . . . , P, and the CSI report includes one or multiple basis vector indicators indicating all or a portion of the first component and one of multiple coefficient indicators indicating all or a portion of the second component.
  16. 16 . The method of claim 15 , wherein the K hypotheses correspond to a same transmission which is one of a single point transmission (SPT), a non-coherent joint transmission (NCJT), or a coherent joint transmission (CJT), where: SPT corresponds to a CSI for one of the N g groups of CSI-RS ports, NCJT corresponds to a CSI across a multiple of the N g groups of CSI-RS ports such that one group is used for each layer, and CJT corresponds to a CSI across the multiple of the N g groups of CSI-RS ports such that the multiple groups are used for each layer.
  17. 17 . The method of claim 15 , wherein each of the N g groups of CSI-RS ports is associated with a respective non-zero power (NZP) CSI-RS resource.
  18. 18 . The method of claim 15 , wherein: identifying the K hypotheses comprises selecting the K hypotheses from a single point transmission (SPT), a non-coherent joint transmission (NCJT), or a coherent joint transmission (CJT), and the CSI report includes at least one indicator indicating the selected K hypotheses.
  19. 19 . The method of claim 15 , further comprising: receiving information about the K hypotheses via the configuration, a medium access control-control element (MAC-CE), or a downlink control information (DCI), wherein identifying the K hypotheses comprises identifying the K hypotheses based on the received information.

Description

CROSS-REFERENCE TO RELATED APPLICATION AND CLAIM OF PRIORITY This application claims priority under 35 U.S.C. § 119(e) to U.S. Provisional Patent Application No. 63/306,844 filed on Feb. 4, 2022 and U.S. Provisional Patent Application No. 63/432,553 filed on Dec. 14, 2022. The above-identified provisional patent applications are hereby incorporated by reference in their entirety. TECHNICAL FIELD The present disclosure relates generally to wireless communication systems and, more specifically, to channel quality reporting. BACKGROUND 5th generation (5G) or new radio (NR) mobile communications is recently gathering increased momentum with all the worldwide technical activities on the various candidate technologies from industry and academia. The candidate 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 waveform (e.g., a new radio access technology (RAT)) to flexibly accommodate various services/applications with different requirements, new multiple access schemes to support massive connections, and so on. SUMMARY This disclosure relates to apparatuses and methods for to channel quality reporting. In one embodiment, a user equipment (UE) is provided. The UE includes a transceiver configured to receive a configuration about a channel state information (CSI) report. The configuration includes information about Ng>1 groups of CSI reference signal (CSI-RS) ports. The UE further includes a processor operably coupled to the transceiver. The processor, based on the configuration, is configured to measure the Ng groups of CSI-RS ports, identify K≥1 hypotheses for the CSI report, and determine the CSI report based on the K hypotheses. The transceiver is further configured to transmit the CSI report. The CSI report corresponds to υ≥1 layers. In another embodiment, a base station (BS) is provided. The BS includes a processor configured to generate a configuration about a CSI report. The configuration includes information about Ng>1 groups of CSI-RS ports. The BS further includes a transceiver operably coupled to the processor. The transceiver is configured to transmit the configuration, transmit CSI-RS on the Ng groups of CSI-RS ports, and receive the CSI report. The CSI report corresponds to υ≥1 layers and is based on K≥1 hypotheses. In yet another embodiment, a method for operating a user equipment (UE) is provided. The method includes receiving a configuration about a channel state information (CSI) report. The configuration includes information about Ng>1 groups of CSI reference signal (CSI-RS) ports. The method further includes, based on the configuration, measuring the Ng groups of CSI-RS ports, identifying K≥1 hypotheses for the CSI report, and determining the CSI report based on the K hypotheses. The method further includes transmitting the CSI report. The CSI report corresponds to υ≥1 layers. 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. Th