Carrier Phase Positioning Across Multiple Frequency Layers
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Solution Overview
Problem
Existing 5G-NR-based positioning solutions suffer from inadequate positioning accuracy, especially in harsh environments, failing to meet the requirements of high-precision applications such as 0.2-meter accuracy, and are susceptible to radio propagation issues like fading and distortion.
Innovation Solution
Implement carrier phase positioning (CPP) by measuring and reporting carrier phase-related information using multiple carriers or positioning frequency layers (PFLs), incorporating joint processing of carrier phase values, and utilizing time stamps for precise location determination, even in challenging conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If standard 5G-NR positioning methods are used, then the system is simple and compatible with existing infrastructure, but positioning accuracy is insufficient (cannot achieve 0.2-meter accuracy) and susceptible to radio propagation issues
Solution Approach 1:
The patent changes the measurement parameter from standard time-based positioning to carrier phase-based positioning. By measuring the phase of the carrier signal instead of just time of arrival, the system achieves much higher positioning accuracy (0.2-meter level) because phase measurements can detect sub-wavelength changes in signal propagation distance
Solution Approach 2:
The patent segments the positioning measurement into multiple components: integer wavelength counting and fractional phase measurement. This segmentation allows the system to overcome the ambiguity of phase wrapping by combining coarse integer wavelength information with fine fractional phase information, achieving high accuracy while managing measurement complexity
2Reliability
If carrier phase measurement is performed over multiple Positioning Frequency Layers, then positioning robustness against fading improves, but measurement complexity and processing time increase
Solution Approach 1:
The patent merges measurements from multiple Positioning Frequency Layers (PFLs) to improve positioning robustness. By combining carrier phase measurements across different frequency layers, the system can overcome frequency-specific fading effects and achieve more reliable positioning results through diversity combining
Solution Approach 2:
The patent performs carrier phase measurements on more PFLs than the minimum single layer, using excessive measurement resources (multiple PFLs) to gain improved reliability and robustness against fading, then processes these measurements to extract the positioning information
3Measurement precision
If joint processing of carrier phase values from multiple carriers is implemented, then positioning accuracy improves, but computational load and processing time increase
Solution Approach 1:
The patent performs preliminary actions by measuring and recording carrier phase values on multiple carriers and PFLs before the final positioning computation. The UE collects all necessary phase measurements and associated metadata (including integer wavelength counts) in advance, preparing the data for efficient joint processing
Solution Approach 2:
The patent introduces an intermediary processing stage where the network entity (LMF) receives the measured carrier phase values and performs joint processing to resolve ambiguities and compute the final position. This intermediary processing separates the complex computation from the UE, reducing UE processing time and load
Data Source
AI summary
Presented are systems and methods for carrier phase positioning. A user equipment (UE) may receive configuration information of a reference signal for positioning from a network. The configuration information may comprise carrier phase-related (CP-related) information configured for the reference signal. The UE may perform a CP measurement on the reference signal based on the CP-related information. The UE may send a report comprising a CP measurement result to the network.