Multidimensional Grid Sampling for RF Power Feedback
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Solution Overview
Problem
Current technologies face challenges in efficiently collecting and sending channel state information (CSI) for frequency-division duplex (FDD) communications in wireless communication networks, particularly due to overhead and complexity issues at mobile devices in the 3GPP New Radio (NR) 5G mobile communications standard.
Innovation Solution
The implementation of multidimensional grid sampling for radio frequency power feedback, where mobile devices sample radio frequency signal power at multiple points defined by a grid with dimensions such as time and frequency, or delay and Doppler, and compress and transmit this data to base stations, reducing overhead and complexity by leveraging reciprocity in FDD systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Type II CSI feedback schemes are implemented in FDD communications, then channel state information accuracy is improved, but overhead and complexity at mobile devices increase
Solution Approach 1:
The patent segments the CSI feedback process into multiple dimensions (time, frequency, spatial) and applies grid sampling across these dimensions. By dividing the feedback into structured grids with specific sampling patterns, the system achieves accurate Type II CSI while reducing the overall complexity through systematic organization of the feedback elements.
Solution Approach 2:
The patent introduces multidimensional grid sampling that operates across time, frequency, and spatial dimensions simultaneously. This dimensional approach transforms the CSI feedback from a single-dimensional problem into a multi-dimensional structured sampling process, improving accuracy while providing a systematic framework that manages complexity.
2Measurement precision
If Type II CSI feedback schemes are implemented in FDD communications, then channel state information accuracy is improved, but overhead increases
Solution Approach 1:
The patent applies partial sampling strategies where not all grid points are sampled with equal intensity. By identifying and focusing sampling resources on critical dimensions and grid points that provide the most valuable CSI information, the system achieves accurate Type II feedback while reducing the total quantity of feedback overhead through selective rather than exhaustive sampling.
Solution Approach 2:
The patent changes the parameters of the sampling process by introducing structured grid patterns with varying densities across different dimensions. By adjusting sampling intervals, grid resolutions, and dimension weights dynamically, the system optimizes the balance between CSI accuracy and feedback overhead, transmitting only the necessary information at appropriate resolutions.
Data Source
AI summary
The described technology is generally directed towards multidimensional grid sampling for radio frequency power feedback. A mobile device can sample radio frequency signal power at multiple sample points, and can send sample values to a base station. The multiple sample points can be defined with reference to a grid having a first dimension and a second dimension, such as time and frequency, or delay and Doppler. A variety of techniques are provided to define the multiple sample points.