Single-Carrier PTRS Configuration for High-Frequency Phase Noise
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Solution Overview
Problem
Existing PTRS configurations for single-carrier waveforms, such as KT-DFT-s-OFDM and SC-FDE, are not optimized for high frequencies beyond 71 GHz, leading to inefficiencies in oscillator phase noise compensation and spectrum utilization.
Innovation Solution
A configurable PTRS configuration is defined based on the sequence lengths of modulation symbols at the beginning and end of each single-carrier waveform symbol, determining the mapping start point and length of PTRS symbols within the symbol, optimized for KT-DFT-s-OFDM and SC-FDE waveforms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing PTRS configurations are used for single-carrier waveforms at high frequencies, then basic phase noise tracking is possible, but phase noise compensation efficiency deteriorates and spectrum utilization becomes inefficient
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting PTRS density and time-domain positions based on frequency range and waveform type. Specifically, different PTRS densities are configured for different frequency ranges (e.g., higher densities for frequencies above 71 GHz where phase noise is more severe), and time-domain positions are optimized according to the specific single-carrier waveform being used (DFT-s-OFDM, SC-FDE, or CT-PUSCH). This resolves the contradiction by adapting PTRS parameters to achieve reliable phase noise compensation while maintaining spectrum efficiency through optimized resource allocation.
Solution Approach 2:
The patent implements dynamics by making PTRS configuration adaptive rather than static. The PTRS density and positioning are dynamically determined based on the actual operating conditions including frequency range, waveform type, and channel conditions. This allows the system to optimize phase noise compensation efficiency in real-time while avoiding excessive PTRS overhead that would reduce spectrum utilization, thus resolving the technical contradiction between reliability and productivity.
2Measurement precision
If PTRS density is increased to improve phase noise tracking accuracy, then measurement precision improves, but overhead increases reducing spectrum efficiency
Solution Approach 1:
The patent applies local quality by configuring different PTRS densities in different time-frequency regions based on local requirements. Specifically, higher PTRS density is applied in frequency ranges and time intervals where phase noise impact is most severe (e.g., above 71 GHz or during periods of high mobility), while lower density is used in regions where phase noise is less problematic. This resolves the contradiction by achieving necessary measurement precision only where needed, thereby reducing overall PTRS overhead and improving spectrum efficiency.
Solution Approach 2:
The patent changes PTRS parameters (density, time-domain positions, frequency-domain positions) based on operating conditions to optimize the trade-off between measurement precision and overhead. By adjusting these parameters dynamically according to frequency range, waveform type, and channel conditions, the system achieves adequate phase noise tracking accuracy while minimizing PTRS overhead, thus resolving the technical contradiction.
3Reliability
If PTRS configuration is optimized for specific single-carrier waveforms, then phase noise compensation reliability improves, but adaptability to different waveform types deteriorates
Solution Approach 1:
The patent applies universality by designing a PTRS configuration framework that works across multiple single-carrier waveform types (DFT-s-OFDM, SC-FDE, CT-PUSCH) while allowing waveform-specific optimizations. The base PTRS configuration principles are universal, but the patent enables adaptation to different waveforms through waveform-specific parameter adjustments and positioning rules. This resolves the contradiction by maintaining reliable phase noise compensation for each waveform type while preserving the ability to handle multiple waveform types through a unified yet flexible configuration approach.
Data Source
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AI summary
The present disclosure relates to a Phase Tracking Reference Signal (PTRS) configuration for signal-carrier waveforms (e.g., Known Tail Discrete Fourier Transform (DFT) spread Orthogonal Frequency Division Multiplexing (KT-DFT-s-OFDM) or Single Carrier Frequency Domain Equalization (SC-FDE) waveforms) used in a communication network. For this purpose, a configurable-length sequence of modulation symbols is added in the beginning and end of each single-carrier waveform symbol. One or more sequences of modulation symbols are reported to a User Equipment (UE) from a network node. The PTRS configuration is defined at the UE based on the sequence length(s) and indicative of how PTRS mapping is to be performed within each single-carrier waveform symbol. The UE may then perform communications with the network node using the PTRS configuration. With such PTRS configuration, it is possible to efficiently perform phase noise detection and compensation.