Phase Noise-Based Reference Signal Design for 5G Positioning
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Solution Overview
Problem
Phase noise, caused by local oscillator fluctuations, significantly degrades positioning accuracy in communication systems, especially in low power consumption environments like IoT scenarios, particularly at higher carrier frequencies in 5G use cases.
Innovation Solution
A system and method that involves estimating phase noise levels in communication systems, allowing for the configuration of reference signals with modified parameters such as subcarrier spacing, power allocation, and bandwidth to improve positioning accuracy by adapting signal design based on phase noise conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If higher carrier frequency is used in 5G use cases, then positioning performance is improved, but phase noise increases causing positioning degradation
Solution Approach 1:
The patent changes signal design parameters (subcarrier spacing, reference signal bandwidth, power allocation) based on the estimated phase noise level. When high phase noise is detected, the system adjusts these parameters to optimize positioning performance under degraded conditions, directly resolving the contradiction between using high carrier frequency for better positioning and suffering from increased phase noise.
Solution Approach 2:
The system implements a feedback mechanism where the user equipment estimates the phase noise level and reports it to the base station. The base station then uses this feedback information to adaptively configure reference signals, creating a closed-loop system that continuously optimizes positioning performance despite varying phase noise conditions.
2Measurement precision
If phase noise estimation and adaptive signal design is implemented, then positioning accuracy is improved under high phase noise conditions, but device complexity increases
Solution Approach 1:
The user equipment performs self-diagnosis by estimating its own phase noise level and reporting only the estimated value to the base station. This self-service approach avoids the need for complex centralized phase noise measurement and analysis, reducing overall system complexity while still enabling adaptive signal design.
Solution Approach 2:
The system performs phase noise estimation before positioning measurement using dedicated reference signals. This preliminary action allows the base station to pre-configure optimal reference signal parameters based on the estimated phase noise level, avoiding the need for complex real-time adjustments during actual positioning operations.
Data Source
AI summary
A system and method for providing phase noise-based signal design for positioning in a communication system. In one embodiment, an apparatus is configured to receive configuration parameters for a reference signal based on a level of phase noise for the reference signal estimated by a user equipment, apply the configuration parameters to the reference signal to obtain a modified reference signal, and transmit the modified reference signal to the user equipment to enable a position of the user equipment to be determined.