PRS Measurement Cross-Validation for Reliable UE Positioning
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Solution Overview
Problem
Existing 5G wireless communication systems face challenges in efficiently managing and validating positioning reference signal (PRS) measurements, leading to increased processing overhead and potential inaccuracies due to non-line-of-sight paths.
Innovation Solution
User Equipment (UEs) share PRS measurements and form virtual UEs to coordinate and validate PRS measurements, reducing processing overhead and improving accuracy by cross-validation and line-of-sight path determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If each UE independently measures and processes PRS signals, then positioning accuracy can be maintained, but processing overhead and power consumption increase significantly
Solution Approach 1:
Multiple UEs are merged into a cooperative positioning group where they jointly measure PRS signals and share measurement results. The group acts as a unified positioning entity, combining their measurement capabilities to achieve accurate positioning while distributing the processing load across multiple devices, thereby reducing individual UE processing overhead.
Solution Approach 2:
Measurement results from one UE are copied and shared with other UEs in the cooperative group. Instead of each UE independently processing all PRS measurements, measurement data is replicated across the group members, allowing them to leverage each other's measurements and reduce redundant processing.
2Reliability
If multiple UEs perform independent PRS measurements, then positioning reliability can be improved, but power consumption increases
Solution Approach 1:
The patent merges multiple UEs into a cooperative positioning group that shares measurement responsibilities. By combining their measurement capabilities and results, the group achieves reliable positioning while distributing the energy consumption across multiple devices, reducing the power burden on individual UEs.
Solution Approach 2:
Within the cooperative group, UEs serve each other by sharing their measurement results. Each UE benefits from the measurements performed by others in the group, reducing the need for every UE to independently perform all measurements, thereby conserving energy while maintaining positioning reliability.
3Device complexity
If PRS measurements are shared among UEs, then processing overhead is reduced, but measurement accuracy may deteriorate due to non-line-of-sight paths
Solution Approach 1:
The patent implements feedback mechanisms where UEs in the cooperative group share not only measurement results but also information about their respective positioning environments and measurement qualities. This feedback allows the group to identify and weight reliable measurements while filtering out inaccurate ones caused by non-line-of-sight conditions, thereby maintaining measurement accuracy while reducing processing overhead.
Solution Approach 2:
The system dynamically adjusts measurement parameters and selection criteria based on the quality indicators provided by each UE. By changing which measurements are used and how they are weighted, the system optimizes the balance between processing efficiency and measurement accuracy, selecting only the reliable measurements for final positioning calculation.
Data Source
AI summary
A method of cross validating a positioning reference signal includes: measuring, at a first UE, a first PRS resource to determine a first PRS measurement; receiving, from a second UE via sidelink communication, a second PRS measurement of a second PRS resource; and determining whether at least one of the first PRS measurement or the second PRS measurement is unreliable based on a relationship of the first PRS measurement to the second PRS measurement.