User Equipment PRS Path Detection for Accurate RSTD Positioning
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately estimating the position of user equipment due to noise interference and multipath signal propagation, which affects the measurement of reference signal time difference (RSTD), leading to inaccurate positioning.
Innovation Solution
The user equipment calculates a power delay profile (PDP) based on positioning reference signals (PRS), performs a path search operation to detect a first arrival path (FAP) with a threshold PDP, and measures RSTD to enhance positioning accuracy, incorporating denoising and fine-tuning operations to remove noise and errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional RSTD measurement methods are used without path detection, then the measurement process is simple, but positioning accuracy deteriorates due to noise and multipath interference
Solution Approach 1:
The patent segments the RSTD measurement process into distinct stages: receiving PRS signals, calculating power delay profiles, detecting first arrival paths through path search operations, and measuring RSTD based on detected paths. This segmentation allows the system to handle noise and multipath interference systematically at each stage, improving positioning accuracy while maintaining manageable process complexity through structured approach.
Solution Approach 2:
The patent performs preliminary actions by calculating power delay profiles and detecting first arrival paths before conducting the actual RSTD measurement. The path search operation identifies reliable signal paths in advance, filtering out noise and multipath interference. This preliminary processing ensures that subsequent RSTD measurements are based on clean, reliable signal paths, significantly improving positioning accuracy.
2Measurement precision
If path search operation with threshold PDP is performed, then first arrival path detection accuracy is improved, but processing time increases
Solution Approach 1:
The patent employs parameter changes by dynamically adjusting the threshold PDP based on signal conditions and using normalized power values relative to peak power. The threshold is defined as a product of peak power and a ratio parameter, allowing adaptive filtering that maintains high detection accuracy while optimizing processing speed. This parameter-based approach enables efficient path detection without excessive processing time.
3Reliability
If denoising operation is applied to PDP, then measurement reliability is improved, but computational complexity increases
Solution Approach 1:
The patent extracts and removes noise components from the power delay profile through denoising operations that isolate and eliminate spurious signals. By separating the useful signal components from noise and multipath interference, the system achieves high measurement reliability. The denoising process selectively removes unwanted components while preserving legitimate signal paths, achieving reliable measurements with manageable computational complexity.
Data Source
AI summary
An operation method of user equipment configured to perform wireless communication with a base station includes receiving a positioning reference signal (PRS) from the base station, calculating a power delay profile (PDP) based on the PRS, detecting at least one path by performing a path search operation based on the PDP, the at least one path including a first path, the path search operation including detecting a first PDP index as the first path, the first PDP index having a value corresponding to a first power of a first threshold PDP or more, and the first threshold PDP being based on a peak power of the PDP, and measuring a reference signal time difference (RSTD) based on the first path.