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EP-4740313-A1 - CSI FEEDBACK BASED ON CODEBOOKS ASSOCIATED WITH POWER BACKOFF VALUES

EP4740313A1EP 4740313 A1EP4740313 A1EP 4740313A1EP-4740313-A1

Abstract

Systems, methods and apparatuses provide channel state information (CSI) feedback based on one or more codebooks and power backoff values corresponding to the codebooks. A user equipment (UE) (110) receives (404), from a network entity (120), at least one channel state information (CSI) report configuration including codebook entities, one or more power relationship indicators indicating a power relationship between a physical downlink shared channel (PDSCH) and a CSI reference signal (CSI-RS) for each codebook entity, and one or more channel measurement resources (CMRs) associated with the CSI-RS. The UE receives (408) one or more CMRs from the network entity. The UE transmits (412), to the network entity, at least one CSI report based on the at least one CSI report configuration and the one or more CMRs.

Inventors

  • FWU, JONG-KAE
  • ZHANG, YUSHU

Assignees

  • Google LLC

Dates

Publication Date
20260513
Application Date
20230811

Claims (16)

  1. A method for wireless communications by a user equipment (UE) (110) , comprising: receiving (404, 504) , from a network entity (120) , at least one channel state information (CSI) report configuration (219) , the at least one CSI report configuration including: a plurality of codebook entities (220) , one or more power relationship indicators indicating a power relationship between a physical downlink shared channel (PDSCH) and a CSI reference signal (CSI-RS) for each codebook entity of the plurality of codebook entities, and one or more channel measurement resources (CMRs) associated with the CSI-RS; receiving (408, 508) , from the network entity, the one or more CMRs; and transmitting (412, 512) , to the network entity, at least one CSI report based on the at least one CSI report configuration and the one or more CMRs.
  2. The method of claim 1, further comprising transmitting (402, 502) UE capability information including at least one of: a first indicator indicating support for providing CSI feedback based on one or more codebook entities and power relationship indicators corresponding to the one or more codebook entities; a maximum number of codebook entities with different power relationship indicators; a maximum number of reported CSIs for the at least one CSI report; a number of CSI processing units (CPUs) for the at least one CSI report; or a second indicator indicating a minimum processing delay for the at least one CSI report.
  3. The method of any one of claims 1-2, wherein the at least one CSI report configuration further includes at least one of: at least one waveform indicator indicating a target waveform for the PDSCH based on the reported CSI; at least one interference measurement resource (IMR) ; a rank restriction indicator indicating a candidate number of layers for CSI feedback; a first channel quality indicator (CQI) table indicator indicating a common or separate CQI table for the plurality of codebook entities; a second CQI table indicator indicating a separate CQI table for each of the plurality of codebook entities; an indicator indicating a number of reported CSIs; a configuration of power relationship indicators for channel quality indicators (CQIs) corresponding to different modulation orders; one or more common CMRs for the plurality of codebook entities; or one or more separate CMRs for the plurality of codebook entities.
  4. The method of claim 3, wherein the target waveform comprises at least one of: a cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) waveform, a discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM) waveform, or a single-carrier frequency division multiple access (SC-FDMA) waveform.
  5. The method of any one of claims 1-4, wherein receiving the one or more CMRs comprises receiving a plurality of CMRs, each of the plurality of CMRs having a same value for at least one of: a number of antenna ports; a bandwidth; a configuration of subcarriers; a periodicity; or a transmission configuration indication (TCI) state.
  6. The method of any one of claims 1-5, further comprising calculating a CSI for the at least one CSI report based on at least one of: one of the plurality of codebook entities; a power relationship indicator for one of the plurality of codebook entities; a target waveform for one of the plurality of codebook entities; or a rank restriction for one of the plurality of codebook entities.
  7. The method of any one of claims 1-6, wherein the transmitting comprises transmitting at least one of: a subset of measured CSIs in the at least one CSI report; a first indicator indicating a number of reported CSIs; a second indicator indicating a codebook entity of the plurality of codebook entities for each reported CSI; all the measured CSIs in the at least one CSI report; a rank indicator (RI) for each CSI in the at least one CSI report; a precoder matrix indicator (PMI) for each CSI in the at least one CSI report; a channel quality indicator (CQI) for each CSI in the at least one CSI report; a layer indicator (LI) for each CSI in the at least one CSI report; a common RI for all reported CSIs; or at least one of a common RI, common PMI, or common LI based on one of the plurality of codebook entities and the CQI for each CSI in the at least one CSI report.
  8. The method of claim 7, further comprising calculating a CQI for each CSI based on an RI corresponding to the CSI and a codebook entity of the plurality of codebook entities corresponding to the CSI.
  9. The method of any one of claims 1-8, further comprising: refraining from transmitting the CSI report when: a number of occupied CPUs in a component carrier (CC) or across CCs exceeds a maximum number of CPUs, or a scheduling offset for the CSI report is smaller than a minimum processing delay.
  10. The method of any of claims 1-9, further comprising determining either or both a number of CPUs or a minimum scheduling offset based on at least one of: a number of the plurality of codebook entities; or a number of the one or more CMRs.
  11. A method for wireless communications by a network entity (120) , comprising: transmitting (404, 604) , to a user equipment (UE) (110) , at least one channel state information (CSI) report configuration (219) , the at least one CSI report configuration including: a plurality of codebook entities (320) , one or more power relationship indicators indicating a power relationship between a physical downlink shared channel (PDSCH) and a CSI reference signal (CSI-RS) for each codebook entity of plurality of codebook entities, and one or more channel measurement resources (CMRs) associated with the CSI-RS; transmitting (408, 608) , to the UE, the one or more CMRs; and receiving (412, 414, 612) , from the UE, at least one CSI report based on the at least one CSI report configuration and the one or more CMRs.
  12. The method of claim 11, further comprising receiving (402, 602) , from the UE, UE capability information including at least one of: a first indicator indicating support for providing CSI feedback based on one or more codebook entities and power relationship indicators corresponding to the one or more codebook entities; a maximum number of codebook entities with different power relationship indicators; a maximum number of codebook entities with different power relationship indicators; a maximum number of reported CSIs for the at least one CSI report; a number of CSI processing units (CPUs) for the at least one CSI report; or a second indicator indicating a minimum processing delay for the at least one CSI report.
  13. The method of any one of claims 11-12, wherein the at least CSI report configuration further includes at least one of: at least one waveform indicator indicating a target waveform for the PDSCH based on the reported CSI; at least one interference measurement resource (IMR) ; a rank restriction indicator indicating a candidate number of layers for CSI feedback; a channel quality indicator (CQI) table indicator indicating a common or separate CQI tables for the plurality of codebook entities; a first indicator indicating a number of reported CSIs; a second indicator indicating a maximum number of reported CSIs; a configuration of power relationship indicators for channel quality indicators (CQIs) corresponding to different modulation orders; one or more common CMRs for the plurality of codebook entities; or one or more separate CMRs for the plurality of codebook entities.
  14. The method of any one of claims 11-13, wherein the receiving comprises receiving, from the UE, at least one of: a subset of measured CSIs in the at least one CSI report; a first indicator indicating a number of reported CSIs; a second indicator indicating a codebook entity of the plurality of codebook entities for each reported CSI; all the measured CSIs in the at least one CSI report; a rank indicator (RI) for each CSI in the at least one CSI report; a precoder matrix indicator (PMI) for each CSI in the at least one CSI report; a channel quality indicator (CQI) for each CSI in the at least one CSI report; a layer indicator (LI) for each CSI in the at least one CSI report; a common RI for all reported CSIs; or at least one of a common RI, common PMI, or common LI based on one of the plurality of codebook entities and the CQI for each CSI in the at least one CSI report.
  15. The method of any one of claims 1-14, wherein the plurality of codebook entities comprises a plurality of codebooks or codebook subsets, and wherein the one or more power relationship indicators comprise one or more power backoff indicators or power offset indicators.
  16. An apparatus, comprising: a communication unit; and a processing system configured to control the communication unit to implement any one of the methods of claims 1-15.

Description

CSI FEEDBACK BASED ON CODEBOOKS ASSOCIATED WITH POWER BACKOFF VALUES TECHNICAL FIELD Aspects of the present disclosure relate generally to wireless communication and techniques for providing channel state information (CSI) feedback based on one or more codebooks and power backoff values corresponding to the codebooks. BACKGROUND Multiple-Input Multiple-Output (MIMO) techniques can improve the reliability and efficiency of communications between a UE and a network entity. MIMO technology employs multiple antennas at both the network entity and the UE to concurrently transmit and receive multiple spatial streams. MIMO may be used to improve data throughput, increase spectral efficiency, and enhance overall network performance. Beamforming is another technique that can enhance the signal quality between a network entity and a UE thereby improving data rates, reducing latency, and increasing overall network performance. In beamforming, the transmitter directs radio frequency (RF) transmission towards a specific direction (e.g., towards an intended receiver) , creating a "beam" of focused energy, rather than radiating the signal in all directions equally. The network entity and the UE can cooperate to determine appropriate operating parameters for MIMO and beamforming operation. For example, the network entity can provide a reference signal referred to as channel state information reference signal (CSI-RS) to the UE. The UE can measure various characteristics of the CSI-RS and provide channel state information (CSI) feedback to the network entity based on the measured characteristics. The network entity can use the CSI feedback to adjust transmission parameters to optimize MIMO and beamforming operation. BRIEF SUMMARY The systems, methods, and devices of this disclosure each have several innovative aspects, no single one of which is solely responsible for the desirable attributes disclosed herein. One innovative aspect of the subject matter described in this disclosure can be implemented as a method for wireless communications by a user equipment. The method may include receiving, from a network entity, at least one channel state information (CSI) report configuration, the at least one CSI report configuration including: a plurality of codebook entities, one or more power relationship indicators indicating a power relationship between a physical downlink shared  channel (PDSCH) and a CSI reference signal (CSI-RS) for each codebook entity of the plurality of codebook entities, and one or more channel measurement resources (CMRs) associated with the CSI-RS. The method may further include receiving, from the network entity, the one or more CMRs. The method may further include transmitting, to the network entity, at least one CSI report based on the at least one CSI report configuration and the one or more CMRs. Another innovative aspect of the subject matter described in this disclosure can be implemented as a method for wireless communications by a network entity. The method may include transmitting, to a user equipment (UE) , at least one channel state information (CSI) report configuration, the at least one CSI report configuration including: a plurality of codebook entities, one or more power relationship indicators indicating a power relationship between a physical downlink shared channel (PDSCH) and a CSI reference signal (CSI-RS) for each codebook entity of plurality of codebook entities, and one or more channel measurement resources (CMRs) associated with the CSI-RS. The method may further include transmitting, to the UE, the one or more CMRs. The method may further include receiving, from the UE, at least one CSI report based on the at least one CSI report configuration and the one or more CMRs. Details of one or more implementations of the subject matter described in this disclosure are set forth in the accompanying drawings and the description below. Other features, aspects, and advantages will become apparent from the description, the drawings, and the claims. BRIEF DESCRIPTION OF THE DRAWINGS Note that the relative dimensions of the following figures may not be drawn to scale. Like reference numbers and designations in the various drawings indicate like elements. To easily identify the discussion of any particular element or act, the most significant digit or digits in a reference number refer to the figure number in which that element is first introduced. Figure 1 is a diagram illustrating an example wireless system including a user equipment communicating with a network entity. Figure 2 is a block diagram illustrating example configurations of a network entity and a user equipment. Figure 3A is a diagram illustrating an antenna port configuration for PDSCH transmission using a type 1 precoder. Figure 3B is a diagram illustrating an antenna port configuration for PDSCH transmission using a type 2 precoder. Figure 4A is a sequence diagram illustrating example operations for providing CSI feedb