Type II Port Selection Codebook Feedback Overhead Reduction
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Solution Overview
Problem
In New Radio (NR) Release 17, the high proportion of non-zero coefficients in the weighting coefficient matrix W′ of the type II port selection codebook results in significant feedback overhead for User Equipment (UE), as defined in Rel-16, which is inefficient for codebook feedback.
Innovation Solution
A method is introduced where the UE acquires a to-be-measured reference signal, determines the type II port selection codebook, and generates feedback parameters including the strongest coefficient index, amplitudes, and phases of all coefficients in the weighting coefficient matrix, reducing the need to specify each non-zero coefficient position, thereby reducing feedback overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the Rel-16 feedback mode for weighting coefficient matrix W' is used, then the codebook can be accurately represented, but the feedback overhead becomes significantly large due to high proportion of non-zero coefficients
Solution Approach 1:
The patent extracts only the essential information needed for codebook representation by using amplitude masking to identify and exclude zero coefficients from feedback, while maintaining the strength of the codebook representation through the remaining non-zero coefficients
Solution Approach 2:
The patent changes the feedback parameters from explicit position and magnitude specifications to amplitude-masked coefficient representations, where zero coefficients are implicitly excluded through amplitude thresholding, thereby reducing feedback overhead while maintaining accuracy
2Reliability
If all non-zero coefficient positions and magnitudes are indicated, then the codebook is fully specified, but the feedback complexity increases significantly
Solution Approach 1:
The patent enables the feedback mechanism to self-identify zero coefficients through amplitude masking, where the system automatically determines which coefficients need to be feedback based on their amplitude values, eliminating the need for explicit position indication of all non-zero coefficients
Solution Approach 2:
The patent applies partial feedback by only transmitting coefficients that exceed the amplitude threshold (non-zero coefficients), rather than transmitting all coefficients with their positions, thereby reducing feedback complexity while maintaining complete codebook specification
Data Source
AI summary
A method and apparatus for feeding back a type II port selection codebook, a method and apparatus for determining a type II port selection codebook, and a computer-readable storage medium are provided. The method for feeding back the type II port selection codebook includes: acquiring a to-be-measured reference signal, and determining the type II port selection codebook based on a measurement result of the to-be-measured reference signal; generating feedback parameters based on the type II port selection codebook, wherein the feedback parameters include a strongest coefficient index, amplitudes of all coefficients, and phases of at least a portion of coefficients in a weighting coefficient matrix in the type II port selection codebook; and transmitting the feedback parameters.