Multi-Layer Beam CSI Feedback Quantization
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Solution Overview
Problem
In wireless communications, the existing methods for coefficient determination in multi-layer beamformed communications face inefficiencies due to high feedback overhead and under-quantization of important beams, leading to suboptimal use of channel resources.
Innovation Solution
The proposed solution involves a user equipment (UE) reporting high-resolution quantization feedback for the highest amplitude precoding coefficients and low-resolution feedback for the remaining non-zero power coefficients across multiple transmission layers, with the UE determining the number of leading beams based on wideband amplitude coefficients and configuring feedback accordingly to optimize channel state information (CSI) reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-resolution quantization feedback is reported for all beams per transmission layer, then measurement precision is improved, but feedback overhead increases
Solution Approach 1:
The patent applies local quality by differentiating quantization precision based on beam importance. Leading beams (with higher amplitude coefficients) receive high-resolution quantization feedback, while non-leading beams receive low-resolution quantization feedback. This selective approach concentrates precision where it matters most, reducing overall feedback overhead while maintaining measurement accuracy for critical beams.
2Quantity of substance
If a fixed number of leading beams is reported per transmission layer, then feedback overhead is reduced, but important beams may be under-quantized
Solution Approach 1:
The patent implements dynamics by making the number of leading beams configurable rather than fixed. The parameter K can be dynamically adjusted based on system conditions, allowing flexible adaptation to different communication scenarios. This enables optimization of the trade-off between feedback overhead and quantization precision for important beams.
3Reliability
If more transmission layers are reported with high quantization, then communication performance is improved, but feedback overhead increases
Solution Approach 1:
The patent applies local quality across multiple transmission layers by selectively applying high-resolution quantization only to leading beams in each layer. This allows maintaining communication performance through multi-layer reporting while controlling feedback overhead by avoiding high-resolution quantization for all beams in all layers.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described that provide for channel state information (CSI) feedback for multiple discrete Fourier transform (DFT) beams on multiple transmission layers. A user equipment (UE) may report a total number of non-zero power DFT beams across all of the transmission layers. The UE may be configured with a total number of leading beams (Ktotal) across all of the transmission layers for which to provide high quantization feedback. When the total number of non-zero DFT beams across all the transmission layers exceeds the configured total number of leading beams across all the transmission layers, the UE may report high-resolution quantization feedback for Ktotal non-zero power precoding coefficients having the highest amplitude coefficients, and may report low-resolution quantization feedback for the remaining non-zero power precoding coefficients. A base station may receive the CSI feedback to determine a precoding matrix.