Carrier Phase Positioning with Multiple Frequencies
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Solution Overview
Problem
Current NR positioning methods using carrier phase measurements face challenges such as integer ambiguity resolution, phase noise, and scalability issues, particularly when relying on time difference of arrival (TDOA) or fixed known locations for calibration.
Innovation Solution
The implementation of a method using multiple frequencies and antennas for carrier phase measurements, which involves a user equipment (UE) measuring carrier phases at different frequencies and reporting these measurements to a location management function (LMF) to resolve integer ambiguity and improve positioning accuracy, while also enabling angle of arrival (AoA) and angle of departure (AoD) measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If carrier phase measurements are performed at a single frequency, then measurement simplicity is maintained, but integer ambiguity cannot be resolved and positioning accuracy is limited
Solution Approach 1:
The patent applies parameter changes by performing carrier phase measurements at multiple frequencies (e.g., first frequency f1 and second frequency f2). By changing the frequency parameter, the system resolves integer ambiguity through the relationship between phase measurements at different frequencies, thereby improving positioning accuracy while managing measurement complexity through systematic multi-frequency observation
2Measurement precision
If TDOA is used to resolve integer ambiguity, then positioning accuracy can be improved, but the method is not scalable and requires fixed known locations
Solution Approach 1:
The patent implements self-service by enabling the UE to autonomously resolve integer ambiguity through its own multi-frequency carrier phase measurements. The UE performs measurements at multiple frequencies and uses the phase difference relationships to determine integer ambiguity without requiring external TDOA assistance or fixed known locations, making the system scalable and adaptable to various deployment scenarios
3Measurement precision
If carrier phase measurements are performed frequently, then positioning accuracy is maintained, but new integer ambiguity is introduced
Solution Approach 1:
The patent applies preliminary action by performing carrier phase measurements at multiple frequencies in advance and establishing the integer ambiguity relationship before positioning calculations are performed. This preliminary multi-frequency measurement approach allows the system to maintain positioning accuracy over time without frequently introducing new integer ambiguity, as the ambiguity resolution is established beforehand through the frequency diversity
Data Source
AI summary
A system and a method are provided in which a user equipment (UE) in a network measures a first carrier phase based on a first reference signal at a first frequency, and a second carrier phase based on a second reference signal at a second frequency that is different from the first frequency. The UE performs a measurement based on the first carrier phase and the second carrier phase. The UE reports the measurement to a location management function (LMF) of the network.