Reference Signal Configuration for Phase Tracking
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Solution Overview
Problem
Current methods for reducing demodulation reference signal (DMRS) density in communication networks lead to inaccurate phase tracking, resulting in decreased transmission performance due to inability to compensate for phase distortion in subsequent time units.
Innovation Solution
Configuring reference signals for cross-time-unit transmission or repetition with frequency domain resources less than those occupied by DMRS, allowing for phase estimation and calibration, thereby enabling accurate phase tracking and improved demodulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If DMRS density is reduced for coverage enhancement, then resource efficiency is improved, but phase tracking accuracy deteriorates
Solution Approach 1:
The patent segments the reference signal function into two distinct parts: DMRS for initial channel estimation and a separate phase tracking reference signal (PT-RS) for continuous phase tracking. This segmentation allows DMRS density to be reduced while phase tracking is maintained by the dedicated PT-RS, resolving the contradiction between resource efficiency and phase tracking accuracy.
Solution Approach 2:
The patent introduces an intermediary phase tracking reference signal (PT-RS) that acts as a mediator between the reduced DMRS and the phase tracking requirement. The PT-RS specifically addresses phase tracking without interfering with the reduced DMRS structure, enabling both resource efficiency and accurate phase tracking to coexist.
2Quantity of substance
If DMRS density is reduced to improve resource efficiency, then transmission overhead is decreased, but transmission performance deteriorates due to phase distortion
Solution Approach 1:
By separating channel estimation (DMRS) from phase tracking (PT-RS), the patent enables reduced transmission overhead through lower DMRS density while maintaining transmission reliability through the dedicated PT-RS that continuously tracks phase distortion across time units.
Solution Approach 2:
The PT-RS provides continuous phase tracking feedback that enables the receiver to compensate for phase distortion in subsequent time units. This feedback mechanism maintains transmission performance despite reduced DMRS density by actively correcting phase errors as they occur.
3Quantity of substance
If reference signal resources are reduced for phase estimation, then resource efficiency is improved, but demodulation accuracy deteriorates
Solution Approach 1:
The patent segments reference signal resources into DMRS for initial channel estimation and PT-RS for phase tracking. This allows overall reference signal resources to be reduced while maintaining demodulation accuracy through the specialized PT-RS that focuses specifically on phase tracking without requiring full DMRS density.
Data Source
AI summary
A communication method includes: configuring transmission of a reference signal for cross-time-unit transmission or on the basis of a reference signal configuration parameter, wherein the reference signal is configured for phase estimation, and frequency domain resources occupied by the transmission of the reference signal is less than frequency domain resources occupied by the transmission of a demodulation reference signal (DMRS).