Multi-Stage PRS Mechanism for 5G DL-AoD Positioning
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Solution Overview
Problem
Current methods for downlink angle of departure (DL-AoD) positioning in 5G wireless systems face challenges in positioning accuracy due to limited resources and high overhead, particularly when using legacy synchronization signals and narrow beam positioning reference signals, which increase signaling and measurement burdens without improving accuracy significantly.
Innovation Solution
A multi-stage positioning reference signal (PRS) mechanism is introduced, where user equipment (UE) performs initial measurements using wide-beam PRS and determines additional configurations for subsequent narrow-beam PRS measurements, reducing overhead and enhancing positioning accuracy without requiring explicit feedback or beam management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If narrow beam positioning reference signals are used for DL-AoD positioning, then positioning accuracy is improved, but signaling overhead and measurement burden increase significantly
Solution Approach 1:
The positioning reference signal is divided into two stages: wide-beam PRS for initial coarse positioning and narrow-beam PRS for fine positioning. This segmentation allows the system to achieve high positioning accuracy only when necessary, reducing overall signaling overhead while maintaining measurement precision.
Solution Approach 2:
Wide-beam PRS measurements are performed first to determine the UE's approximate location and select candidate beams. This preliminary action enables the system to identify which narrow-beam PRS measurements are actually needed, avoiding unnecessary signaling and measurements.
2Measurement precision
If narrow beam positioning reference signals are used for DL-AoD positioning, then positioning accuracy is improved, but measurement burden increases
Solution Approach 1:
The measurement process is segmented into two phases: initial wide-beam PRS measurements for coarse positioning, followed by selective narrow-beam PRS measurements for fine positioning. This reduces the total number of measurements required while maintaining high positioning accuracy.
Solution Approach 2:
The UE performs wide-beam PRS measurements first to establish candidate beam sets. This preliminary measurement guides subsequent narrow-beam PRS measurements, ensuring that time-consuming fine measurements are only performed on beams that are likely to provide useful positioning information.
3Measurement precision
If explicit feedback and beam management are implemented for PRS measurements, then positioning accuracy is improved, but system overhead and latency increase
Solution Approach 1:
The UE autonomously determines candidate beam sets based on wide-beam PRS measurements without requiring explicit network feedback or beam management commands. This self-service approach eliminates unnecessary signaling overhead and reduces latency while maintaining positioning accuracy.
Solution Approach 2:
The patent extracts and removes the explicit feedback and beam management components from the PRS measurement process. By taking out these unnecessary elements, the system achieves positioning accuracy through autonomous UE measurements, reducing system overhead and simplifying the protocol.
Data Source
AI summary
Systems, methods, apparatuses, and computer program products for a multi-stage positioning reference signal (PRS) mechanism for downlink angle of departure (DL-AoD) positioning.