PTRS Density Configuration for Phase Noise Compensation
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Solution Overview
Problem
High-frequency wireless communication systems face adverse impacts from phase noise generated by non-ideal local oscillators, particularly in OFDM systems, leading to common phase errors and inter-carrier interference, which existing methods struggle to effectively mitigate.
Innovation Solution
A method for configuring the time-frequency density of phase tracking reference signals (PTRS) to be transmitted between network devices and terminal devices, allowing for accurate phase noise estimation while minimizing resource waste and avoiding interference, by determining optimal time and frequency domain densities based on transmission scenarios and parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the density of phase tracking reference signals (PTRS) is increased to improve phase noise estimation accuracy, then phase noise compensation performance is improved, but resource overhead increases
Solution Approach 1:
The patent applies dynamics by making the PTRS density configurable and adaptable rather than fixed. The network device can dynamically adjust the time-domain and frequency-domain densities of PTRS based on transmission conditions, allowing the system to optimize between phase noise estimation accuracy and resource overhead in real-time different transmission scenarios.
Solution Approach 2:
The patent implements parameter changes by introducing configurable parameters for PTRS density including time-domain density (affecting how often PTRS is transmitted in time) and frequency-domain density (affecting how often PTRS is transmitted across frequency resources). These parameter adjustments enable flexible control over the trade-off between estimation accuracy and resource consumption.
2Reliability
If PTRS is transmitted at high density to compensate for phase noise in high-frequency systems, then phase noise compensation performance is improved, but transmission resources are wasted
Solution Approach 1:
The patent changes the parameters of PTRS transmission by introducing separate control of time-domain density and frequency-domain density. This allows the system to adjust PTRS transmission density according to actual phase noise characteristics and channel conditions, avoiding unnecessary high-density transmission when phase noise is not severe, thus reducing resource waste while maintaining compensation performance when needed.
Solution Approach 2:
The system dynamically adapts PTRS density parameters based on transmission conditions. The network device can flexibly configure the density parameters according to the specific high-frequency transmission scenario, making the system responsive to changing conditions rather than using a static high-density approach that would waste resources in all situations.
3Device complexity
If fixed-density PTRS transmission is used, then system complexity is reduced, but adaptability to different transmission scenarios is limited
Solution Approach 1:
The patent introduces dynamics by enabling flexible configuration of PTRS density parameters. Instead of a fixed density approach, the system can adaptively adjust time-domain and frequency-domain densities based on different transmission scenarios such as varying carrier frequencies, modulation schemes, and channel conditions, significantly improving adaptability.
Solution Approach 2:
The patent segments the control of PTRS density into two independent dimensions: time-domain density and frequency-domain density. This segmentation allows independent optimization of each dimension according to specific transmission requirements, providing fine-grained control over PTRS transmission while maintaining manageable system complexity through modular parameter control.
Data Source
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AI summary
This application provides a reference signal indication method and apparatus. The method includes: transmitting, by a terminal device, a PTRS to a network device based on a time domain density; and receiving, by the network device, the PTRS transmitted by the terminal device based on the time domain density, where the time domain density is a density in a discrete Fourier transform spread orthogonal frequency division multiplexing DFT-s-OFDM waveform. Therefore, PTRS transmission can be ensured.