PTRS Density Adaptation for Phase Noise in High-Frequency Wireless
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Solution Overview
Problem
High-frequency wireless communications systems, particularly those above 6 GHz, face challenges in phase noise, Doppler effects, and carrier frequency offsets, leading to performance degradation due to inaccurate phase tracking reference signal (PTRS) estimation, especially when bandwidth thresholds are reached, causing PTRS quantity jumps and reduced spectral efficiency.
Innovation Solution
The method involves determining the time and frequency domain densities of PTRS based on available bandwidth rather than scheduled bandwidth, ensuring uniform mapping and avoiding collisions, thereby maintaining accurate common phase error estimation and spectral efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the frequency domain density of PTRS is set based on scheduled bandwidth thresholds, then the PTRS quantity can be controlled to manage phase noise estimation, but the PTRS quantity jumps when bandwidth reaches thresholds, causing non-uniform mapping and reduced spectral efficiency
Solution Approach 1:
The patent applies dynamics by making the PTRS frequency domain density adaptive rather than fixed. The density is dynamically adjusted based on the actual number of scheduled resource blocks within the bandwidth, allowing the system to smoothly transition between different bandwidth conditions without abrupt jumps. This dynamic adaptation resolves the contradiction by maintaining accurate phase error estimation while avoiding the spectral efficiency loss caused by sudden PTRS quantity changes at threshold boundaries.
Solution Approach 2:
The patent changes the parameter of frequency domain density from a fixed threshold-based value to a continuously adjustable parameter. Instead of using discrete density values tied to bandwidth thresholds, the system calculates the optimal density based on the actual scheduled resource block count, enabling smooth parameter transitions that maintain both estimation accuracy and spectral efficiency across varying bandwidth conditions.
2Stability of the object's composition
If a fixed quantity of PTRSs is mapped in frequency domain, then the PTRS quantity remains stable or increases with bandwidth, but the mapping becomes non-uniform when quantity is fixed, causing collisions with other reference signals
Solution Approach 1:
The patent applies dynamics by making the PTRS quantity and density adaptive rather than fixed. The system dynamically calculates the appropriate number of PTRSs and their spacing based on the actual scheduled resource blocks, ensuring uniform distribution across the frequency domain. This dynamic approach resolves the contradiction by maintaining both quantity stability and mapping uniformity, preventing collisions with other reference signals while keeping PTRS quantity consistent.
3Productivity
If larger scheduled bandwidth uses smaller frequency domain density of PTRS, then the number of PTRSs is reduced to improve spectral efficiency, but the accuracy of common phase error estimation deteriorates
Solution Approach 1:
The patent changes the frequency domain density parameter from a fixed inverse relationship with bandwidth to an adaptive parameter. The system calculates the optimal density based on the actual scheduled resource block count within the bandwidth, allowing the density to scale appropriately with bandwidth changes. This parameter adaptation resolves the contradiction by maintaining sufficient PTRS density for accurate phase error estimation even in large bandwidth scenarios, while still improving spectral efficiency compared to fixed density approaches.
Data Source
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AI summary
This application provides an information transmission method and apparatus. The method includes: determining a time domain density of a phase tracking reference signal PTRS; determining a frequency domain density of the phase tracking reference signal PTRS based on available bandwidth, or determining a frequency domain density of the phase tracking reference signal PTRS based on a scheduled resource block RB or an available resource block RB; mapping the PTRS to one or more orthogonal frequency division multiplexing OFDM symbols based on the time domain density and the frequency domain density; and sending a signal that includes the OFDM symbol to which the PTRS is mapped. The corresponding apparatus is also disclosed. When the technical solution of this application is used, a quantity of PTRSs can be prevented from jumping when a value of scheduled bandwidth is close to a threshold, both accuracy of common phase error estimation and spectral efficiency are taken into consideration, and the PTRSs can be uniformly mapped in the scheduled or available bandwidth, thereby properly configuring the PTRSs.