PT-RS Mapping for Phase Noise Compensation in 5G Coverage Extension
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Solution Overview
Problem
Current wireless communication systems, particularly 5G, face challenges in extending signal coverage due to phase noise issues, especially in higher frequency bands, where existing reference signals are inadequate for effective phase noise estimation and compensation.
Innovation Solution
The method involves configuring a phase tracking-reference signal (PT-RS) on specific channels like PDSCH and PUSCH, with the base station transmitting DCI indicating PT-RS mapping and intervals, allowing terminals to perform transmission and reception procedures that include the PT-RS, which is mapped based on demodulation RS, enabling phase noise estimation and compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a new reference signal (PT-RS) is introduced for phase noise estimation and compensation, then signal coverage extension is achieved, but device complexity increases due to additional signaling and mapping configuration requirements
Solution Approach 1:
The patent introduces a phase tracking reference signal (PT-RS) as an intermediary element between the existing demodulation reference signal (DM-RS) and the data channel. The PT-RS acts as a mediator that specifically targets phase noise estimation and compensation, allowing the system to extend coverage without fundamentally redesigning the existing reference signal framework. This intermediary approach resolves the contradiction by adding targeted functionality rather than replacing existing structures.
Solution Approach 2:
The patent segments the reference signal functionality into distinct components: the existing DM-RS for basic demodulation and the new PT-RS for specialized phase noise tracking. This segmentation allows each reference signal type to be optimized for its specific purpose, with the PT-RS providing dedicated phase noise estimation capabilities while the DM-RS maintains its demodulation function. The segmentation resolves the contradiction by distributing complexity across specialized components rather than concentrating all functionality in a single reference signal.
2Adaptability or versatility
If PT-RS is mapped on multiple channels (PDSCH, PUSCH, PUCCH) with flexible configuration, then adaptability improves, but ease of operation deteriorates due to increased configuration management complexity
Solution Approach 1:
The patent implements dynamic PT-RS mapping that adapts to different channel conditions and requirements. The PT-RS can be selectively mapped on PDSCH, PUSCH, or PUCCH based on real-time phase noise characteristics and channel requirements. This dynamic approach resolves the contradiction by allowing the system to activate PT-RS mapping only where and when needed, rather than statically configuring it across all channels, thus maintaining adaptability while reducing operational complexity.
Solution Approach 2:
The patent applies local quality by configuring PT-RS mapping characteristics specifically for each channel type based on its unique requirements. Different mapping patterns, densities, and positions are applied locally to PDSCH, PUSCH, and PUCCH according to their specific phase noise characteristics and operational needs. This localized configuration approach resolves the contradiction by providing channel-specific optimization without requiring global reconfiguration of the entire system.
Data Source
AI summary
A method and a device for configuring a reference signal for coverage extension are disclosed. A method of a terminal comprises the steps of: receiving, from a base station, DCI including information indicating whether PT-RS is mapped; identifying that the PT-RS is mapped to a data channel on the basis of the information; and performing a procedure of transmitting or receiving the data channel including the PT-RS to or from the base station.