Dynamic PTRS Pattern Selection for Phase Noise Compensation
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Solution Overview
Problem
Wireless communication systems face challenges in maintaining link quality and data throughput due to high error magnitudes in certain reference signal patterns, particularly in phase tracking reference signals (PTRSs), which affect the performance between user equipment (UE) and base stations.
Innovation Solution
The described techniques allow user equipment (UE) to select a candidate reference signal pattern based on factors like receiver type and phase noise, and communicate this selection to the base station, which then configures the PTRSs accordingly, enabling improved link quality and data throughput by optimizing the reference signal pattern and configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed reference signal pattern is used for phase tracking, then the system complexity is reduced and ease of operation is improved, but link quality deteriorates due to high error magnitudes in certain patterns
Solution Approach 1:
The reference signal pattern is made dynamic by allowing the UE to select from multiple candidate patterns based on measured phase noise characteristics. The base station configures the UE with a set of candidate patterns, and the UE dynamically selects the most appropriate pattern based on current channel conditions, thereby adapting the system to varying reliability requirements without requiring complex centralized control.
Solution Approach 2:
The invention changes the parameter of reference signal pattern configuration from a fixed static value to a dynamic value that varies based on phase noise measurements. By monitoring phase noise characteristics and selecting patterns accordingly, the system optimizes link quality by matching the reference signal pattern to the actual channel conditions, reducing error magnitudes in phase tracking.
2Measurement precision
If reference signal patterns with higher density are used, then phase tracking accuracy is improved, but resource overhead increases and productivity decreases
Solution Approach 1:
Different reference signal patterns are designed with different local densities of reference signals tailored to specific phase noise conditions. The UE selects the pattern that provides appropriate local quality for the current channel conditions, avoiding the need to use high-density patterns universally. This ensures sufficient phase tracking accuracy is achieved only when and where needed, preserving data throughput in conditions that do not require high tracking precision.
3Adaptability or versatility
If the base station determines the reference signal configuration unilaterally, then device complexity is reduced, but adaptability to different receiver types and phase noise conditions deteriorates
Solution Approach 1:
The base station performs preliminary action by configuring the UE with a set of candidate reference signal patterns that cover different phase noise scenarios and receiver types. The UE then uses these pre-configured patterns to select the most appropriate one based on measured conditions. This preliminary configuration approach enables adaptability without requiring complex real-time configuration management, as the decision space has been pre-prepared by the base station.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may select a candidate pattern from a set of patterns for reference signals used to track phase error. The UE may transmit an indication of the selected pattern to a base station and receive, from the base station at least in part in response to the transmitted indication of the selected pattern, an indication of a configuration for the reference signals used to track phase error, the configuration indicating a pattern of the set of patterns, a number of reference signal groups, and a number of samples per reference signal group. The UE may receive the reference signals used to track phase error according to the indicated configuration.