CSI Compression in Time Domain Using TRS Channel Tracking
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Solution Overview
Problem
Existing 5G communication systems require multiple CSI-RS occasions for channel state information measurement, which is inefficient and may necessitate changes to legacy CSI reporting protocols.
Innovation Solution
A method and apparatus for obtaining time domain and Doppler domain information from tracking reference signals (TRS) to enhance CSI reporting without requiring additional CSI-RS measurements or changes to legacy CSI reporting protocols, enabling time domain channel tracking and correlation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple CSI-RS occasions are used for channel state information measurement, then measurement precision is improved, but device complexity and signaling overhead increase
Solution Approach 1:
The patent combines time domain channel tracking information obtained from TRS measurements with frequency domain CSI information from CSI-RS measurements. This merging allows the system to achieve accurate channel state information without requiring multiple separate CSI-RS occasions, thereby reducing system complexity while maintaining measurement precision.
Solution Approach 2:
The patent introduces time domain correlation information as an intermediary element that bridges the gap between limited TRS measurements and comprehensive channel state information. This intermediary allows the system to infer channel characteristics without directly measuring them through multiple CSI-RS occasions, reducing the burden on the system.
2Measurement precision
If multiple CSI-RS occasions are used for channel state information measurement, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The patent performs time domain channel tracking using TRS measurements in advance, before CSI-RS based CSI measurement. This preliminary action captures temporal channel characteristics that can be reused for subsequent CSI reporting, eliminating the need for repeated time-consuming measurements and reducing overall measurement time while maintaining precision.
Solution Approach 2:
The patent establishes continuous time domain channel tracking through periodic TRS measurements, maintaining an up-to-date understanding of channel temporal characteristics. This continuous tracking ensures that when CSI-RS measurements are performed, the system already has current time domain information, eliminating gaps and reducing total measurement time.
3Productivity
If time domain channel tracking is implemented using TRS, then productivity is improved, but measurement precision may be compromised
Solution Approach 1:
The patent transforms time domain channel characteristics into a compressed spectral representation using Fourier transform or similar techniques. This parameter transformation allows efficient representation of temporal channel behavior with reduced precision requirements, enabling high productivity while maintaining sufficient tracking accuracy for practical purposes.
Solution Approach 2:
The patent applies different precision levels to different aspects of channel information. Time domain correlation from TRS uses moderate precision for capturing temporal trends, while frequency domain CSI from CSI-RS uses high precision for accurate channel state representation. This local quality approach optimizes overall system performance without compromising critical measurements.
Data Source
AI summary
Inter-alia, a method is disclosed comprising: obtaining a time domain and/or doppler domain information, based on measuring time variations of a channel from tracking reference signal, TRS; and reporting the time domain and/or doppler domain information and a channel state information, CSI, wherein the CSI is obtained by measuring on CSI reference signal, CSI-RS. Further, a method is disclosed comprising: receiving time domain and/or doppler domain information and at least one channel state information, CSI; and reconstructing a time domain function based on the time domain and/or doppler domain information and a precoder matrix based on CSI. It is further disclosed according apparatuses, computer programs and systems.