Dynamic PTRS Configuration for Lower 5G Resource Overhead
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently configuring phase tracking reference signals (PTRS) due to fixed patterns that lead to high resource overheads and inflexibility in handling varying modulation and coding schemes and bandwidths, especially in high-frequency networks like 5G, which exacerbates phase noise issues.
Innovation Solution
A method to dynamically configure PTRS patterns based on modulation and coding schemes, scheduled resource block quantities, and phase noise factors, allowing for flexible adjustment in time and frequency domains to reduce resource usage and improve spectral efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed configuration mode for PTRS patterns is used, then implementation is simple, but resource overheads are high and flexibility is poor
Solution Approach 1:
The patent applies dynamics by transitioning from fixed PTRS patterns to dynamic configuration. The network device determines PTRS patterns based on real-time conditions including phase noise levels, modulation and coding schemes, and scheduled bandwidth. This allows the system to adapt PTRS density and distribution dynamically, reducing resource overhead when phase noise is low while maintaining adequate coverage when phase noise is high.
Solution Approach 2:
The patent changes key parameters of PTRS configuration including time domain density, frequency domain density, and resource element offsets based on communication conditions. By adjusting these parameters dynamically according to phase noise characteristics and scheduling requirements, the system achieves flexible adaptation without fixed constraints.
2Reliability
If PTRS density is increased to improve phase noise compensation, then phase noise error compensation performance is improved, but resource overheads increase
Solution Approach 1:
The patent dynamically adjusts PTRS parameters including time domain density and frequency domain density based on phase noise characteristics. When phase noise impact is high, the system increases PTRS density to improve compensation performance. When phase noise impact is low, the system reduces density to minimize resource overhead, achieving optimal balance between reliability and resource efficiency.
Solution Approach 2:
The system transitions from static PTRS configuration to dynamic adjustment based on real-time phase noise measurements and communication conditions. The network device determines appropriate PTRS patterns dynamically, allowing the density to adapt to actual needs rather than maintaining constant high density for all scenarios.
3Area of stationary object
If PTRS patterns are configured for high data bandwidth with many subcarriers, then coverage is improved, but resource overheads become relatively high
Solution Approach 1:
The patent applies local quality by configuring PTRS patterns with different frequency domain densities in different bandwidth scenarios. For high data bandwidth with many subcarriers, the system optimizes the frequency domain density to provide adequate coverage without uniformly increasing density across all subcarriers. This localized optimization reduces overall resource overhead while maintaining necessary coverage.
Solution Approach 2:
The system dynamically determines PTRS frequency domain density based on scheduled bandwidth and number of subcarriers. Rather than using fixed high density for all bandwidth scenarios, the density is adjusted dynamically to match the actual bandwidth requirements, reducing resource overhead in high bandwidth scenarios while maintaining adequate phase noise compensation.
Data Source
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AI summary
This application provides a wireless communication method and a wireless communications apparatus, to flexibly configure a phase tracking reference signal to reduce a quantity of subcarriers occupied by the phase tracking reference signal and reduce resource overheads. The method includes: determining, by a network device, a pattern of a phase tracking reference signal based on at least one of a modulation and coding scheme threshold that is corresponding to the pattern of the phase tracking reference signal and requested by a terminal device, a scheduled resource block quantity threshold corresponding to the phase tracking reference signal requested by the terminal device, and a factor of impact of phase noise of the terminal device on a signal received by the terminal device and at least one of a modulation and coding scheme currently scheduled by the network device for the terminal device and bandwidth currently scheduled by the network device for the terminal; and sending the phase tracking reference signal to the terminal device based on the determined pattern of the phase tracking reference signal.