Codebook Feedback Indication for Reduced Multi-Layer Overhead
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Solution Overview
Problem
The feedback overhead increases when indicating the information of various parts of a codebook structure in communication systems with rank≥1 using traditional schemes.
Innovation Solution
A codebook indication method that reduces feedback overhead by transmitting port selection, strongest coefficient, and frequency domain basis vector information efficiently, using combination numbers and bitmaps to indicate intersections and unions of ports and coefficients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If traditional schemes are used to indicate codebook structure information, then complete codebook information can be transmitted, but feedback overhead increases
Solution Approach 1:
The patent extracts and separately indicates only the essential codebook information elements (port selection, strongest coefficient, frequency domain basis vector) rather than transmitting complete codebook structure information. This selective extraction reduces feedback overhead while maintaining the necessary information for precoding operations.
Solution Approach 2:
The codebook indication is segmented into multiple independent parts: port selection indication information, strongest coefficient indication information, and frequency domain basis vector indication information. Each segment can be independently indicated and processed, allowing for optimized feedback mechanisms for each component.
2Measurement precision
If detailed port selection information is indicated for each transmission layer, then precise port selection is achieved, but indication overhead increases
Solution Approach 1:
The patent merges the indication of ports across different polarization directions by indicating an intersection of ports that are common to both polarization directions. This combining approach reduces overhead by avoiding redundant port indications while maintaining precise port selection through the intersection concept.
3Reliability
If comprehensive codebook information is reported, then network-side device can generate accurate codebook, but feedback overhead increases
Solution Approach 1:
The patent introduces an intermediary indication mechanism where the terminal device reports key parameters (port selection, strongest coefficient, frequency domain basis vector) that serve as mediators for the network-side device to reconstruct the codebook. These intermediary elements enable accurate codebook generation without requiring complete codebook information to be transmitted.
Data Source
AI summary
Embodiments of the present disclosure provide a codebook indication method and apparatus, and a storage medium. The method comprises: sending codebook indication information to a network side device, the codebook indication information including at least one of the following information of at least one transmission layer: port selection indication information, strongest coefficient indication information, or frequency domain base vector indication information. In the embodiments of the present disclosure, by indicating at least one of the port selection of at least one transmission layer, the strongest coefficient of a combined coefficient matrix, and the frequency domain basis vector, the feedback overhead of indication of some ports, the feedback overhead of the strongest coefficient indication, and the overhead of the frequency domain base vector indication can be reduced, compared with the traditional independent indication of each layer.