PT-RS Port Mapping for Multi-TRP SFN Phase Noise Estimation
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Solution Overview
Problem
The issue of phase noise estimation for Single Frequency Network (SFN) based PDSCH transmission in wireless communications, particularly in scenarios involving multiple Transmission Reception Points (TRPs), is not adequately addressed by existing technologies.
Innovation Solution
The method involves determining phase tracking reference signals (PT-RS) for SFN based PDSCH transmission by associating PT-RS ports with DM-RS ports and TCI states, and mapping these ports to resource elements within the resource block based on specific rules, ensuring accurate phase noise estimation across multiple TRPs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SFN based PDSCH transmission is used for coverage enhancement in multi-TRP scenario, then coverage and reliability are improved, but phase noise estimation accuracy deteriorates due to independent phase noises from different TRPs
Solution Approach 1:
The patent segments the phase noise estimation by associating separate PT-RS ports with different TCI states for each TRP. Instead of using a single PT-RS port for all TRPs, the system creates distinct PT-RS ports (e.g., PT-RS port 0 for TRP 0, PT-RS port 1 for TRP 1) that can independently estimate phase noise for each TRP, resolving the accuracy deterioration issue while maintaining SFN coverage benefits
Solution Approach 2:
The patent applies local quality by assigning different TCI states to different PT-RS ports based on their associated TRPs. Each PT-RS port is configured with specific QCL parameters (QCL-TypeA and QCL-TypeD) corresponding to its TRP, enabling TRP-specific phase noise estimation while maintaining the overall SFN transmission structure
2Measurement precision
If multiple PT-RS ports are configured for multi-TRP phase noise estimation, then phase noise estimation accuracy is improved, but device complexity increases
Solution Approach 1:
The patent implements universality by using DM-RS ports as a universal reference for determining PT-RS port associations. The same DM-RS port configuration and TCI state indication mechanism serves both PDSCH demodulation and PT-RS phase noise estimation functions, avoiding the need for separate complex PT-RS configuration systems while maintaining accurate multi-TRP phase noise estimation
Data Source
AI summary
Methods and apparatuses for determining phase tracking reference signal (PT-RS) for single frequency network (SFN) based PDSCH transmission are disclosed. A method comprises determining, for each of two PT-RS ports for SFN based PDSCH transmission, an associated DM-RS port with an indicated TCI state, wherein, one or multiple PDSCH layers are scheduled for the SFN based PDSCH transmission; determining, for each of the two PT-RS ports, an RE index in the RB containing PT-RS resources; and receiving the two PT-RS ports associated with two TCI states.