CSI Codebook Parameter Configuration for Beam Refinement Feedback

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Solution Overview

Problem

Wireless communication systems face challenges in managing and optimizing finite channel resources due to signal attenuation and blocking in complex and dynamic environments, undermining established wireless channel measuring and reporting mechanisms.

Innovation Solution

A method for configuring and signaling channel state information (CSI) by a user equipment (UE) and a network entity, involving the transmission of CSI based on a codebook configuration that includes parameters such as the number of selected ports, spatial bases, and non-zero coefficients, to enhance channel state feedback (CSF) reporting.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If traditional channel measuring and reporting mechanisms are used, then system simplicity is maintained, but measurement precision and reliability deteriorate due to signal attenuation and blocking in complex environments

Engineering Contradiction:

Improvechannel state measurement precisionVSAvoidcodebook configuration complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The codebook configuration is segmented into multiple independent parameters (number of selected ports, number of spatial bases, number of frequency domain bases, number of non-zero coefficients). This segmentation allows the system to optimize channel state feedback by selectively adjusting individual parameters without reconfiguring the entire codebook structure, thereby improving measurement precision while managing complexity through modular parameter control.

Inventive Principle:

Principle #1Segmentation

2Reliability

If codebook configuration with multiple parameters is implemented, then channel state feedback accuracy is improved, but signaling overhead and processing complexity increase

Engineering Contradiction:

Improvechannel state feedback reliabilityVSAvoidsignaling overhead

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The system dynamically adjusts codebook parameters (number of selected ports, spatial bases, frequency domain bases, non-zero coefficients) based on channel conditions and feedback requirements. By changing these parameters adaptively, the system optimizes the balance between feedback reliability and signaling overhead, transmitting only the necessary parameter information rather than complete codebook data.

Inventive Principle:

Principle #35Parameter changes

3Productivity

If comprehensive codebook parameters are reported, then channel resource optimization is improved, but processing time and computational load increase

Engineering Contradiction:

Improvechannel resource optimization efficiencyVSAvoidCSI processing time

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The system extracts and reports only the essential codebook parameters (number of selected ports, spatial bases, frequency domain bases, non-zero coefficients) rather than complete channel state information. This extraction approach enables efficient channel resource optimization by providing the network entity with sufficient information for precoding and resource allocation decisions while minimizing processing time and computational load at both UE and network entity.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS20250373295A1Non-zero coefficient reporting and codebook parameter configuration

Publication Date: 2025.12.04 QUALCOMM INC

AI summary

Certain aspects of the present disclosure provide techniques for a beam refinement procedure. According to certain aspects, a method for wireless communications by a user equipment (UE) generally includes generating CSI comprising non-zero coefficients according to a codebook parameter configuration and transmitting the CSI to a network entity.