Continuous Positioning Reference Signal for Carrier Phase Tracking
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Solution Overview
Problem
Conventional wireless communication networks lack accurate carrier phase-based positioning methods, leading to limited accuracy in determining UE positions, especially in cellular networks, which are unable to achieve centimeter or millimeter-level precision due to discontinuities in conventional PRS patterns and CP-OFDM waveforms.
Innovation Solution
A new positioning reference signal (C-PRS) design with contiguous time-domain RE mapping and a continuous OFDM waveform is introduced, using a raised cosine technique to smooth symbol edges and ensure continuous phase tracking, enabling improved accuracy in phase-based positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional PRS patterns and CP-OFDM waveforms are used, then wireless communication compatibility is maintained, but positioning accuracy is limited and cannot achieve centimeter or millimeter-level precision
Solution Approach 1:
The patent applies parameter changes by modifying the PRS signal waveform characteristics, specifically transitioning from conventional discontinuous CP-OFDM waveforms to continuous waveforms with raised cosine smoothing. This changes the temporal and spectral parameters of the reference signal to enable continuous phase tracking across symbol boundaries, achieving centimeter-level positioning accuracy while maintaining compatibility with existing wireless communication frameworks
Solution Approach 2:
The patent employs raised cosine smoothing which introduces curved transitions at symbol boundaries instead of abrupt discontinuities. This curvature in the time-domain waveform ensures continuous phase tracking by smoothly connecting adjacent symbols, eliminating the discontinuities that prevent accurate carrier phase-based positioning in conventional systems
2Measurement precision
If conventional discontinuous PRS patterns are used, then implementation simplicity is maintained, but phase tracking continuity is broken and positioning precision is limited
Solution Approach 1:
The patent applies preliminary action by pre-smoothing the PRS signal at symbol boundaries using raised cosine windows before transmission. This preliminary processing ensures that discontinuities are eliminated in advance, enabling continuous phase tracking without requiring complex real-time corrections at the receiver, thus improving phase estimation accuracy while keeping implementation feasible
Solution Approach 2:
The raised cosine smoothing function acts as an intermediary between conventional discontinuous PRS and ideal continuous waveforms. It mediates the transition by introducing gradual amplitude changes at symbol boundaries, maintaining signal integrity while enabling continuous phase tracking, thus bridging the gap between implementation simplicity and positioning precision
Data Source
AI summary
Various aspects of the present disclosure relate to a user equipment (UE) and a transmission reception point (TRP) for wireless communication configured to generate a continuous positioning reference signal for continuous tracking of phase for positioning using a raised cosine technique, and transmit the continuous positioning reference signal, the continuous positioning reference signal extending across at least two contiguous symbols within a first subcarrier. The continuous positioning reference signal may be used to perform a phase measurement which is used to estimate a position of the UE.