Sidelink Differential AoA Positioning for Out-of-Coverage UEs
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing positioning techniques for mobile devices face challenges in accurately determining the location of a target UE when the target UE and/or the anchor UE are out of coverage of a base station, and angle of arrival measurements are difficult due to unknown orientation of the anchor UE.
Innovation Solution
The method involves obtaining a differential angle-of-arrival (AoA) between wireless reference signals transmitted by different mobile devices and using this differential AoA to determine the position of the first mobile device, employing a transceiver and processing units to calculate and provide the device's location.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional AoA measurements are used for positioning, then location determination can be performed, but accuracy deteriorates when the anchor UE orientation is unknown
Solution Approach 1:
The patent transforms the positioning approach by changing from absolute AoA measurements to differential AoA measurements. Instead of measuring the absolute angle of arrival which requires known anchor orientation, the system measures the difference between AoA of reference signals from multiple UEs. This parameter transformation eliminates the dependency on anchor UE orientation information while maintaining positioning capability.
Solution Approach 2:
The patent introduces a differential measurement approach as an intermediary technique. By measuring the difference between two AoA values rather than absolute angles, the system creates a relative reference frame that does not require knowledge of the anchor's absolute orientation. This intermediary measurement method bridges the gap between available measurements and positioning requirements.
2Adaptability or versatility
If positioning is attempted when UEs are out of base station coverage, then autonomous positioning can be achieved, but measurement reliability deteriorates
Solution Approach 1:
The patent enables UEs to perform positioning autonomously without base station assistance. The target UE and anchor UEs collectively perform measurements, calculations, and position determination among themselves using sidelink communications. This self-service mechanism allows positioning to function independently of base station coverage while maintaining reliability through distributed measurement and computation.
Solution Approach 2:
The patent makes the positioning system universally applicable by enabling it to operate in multiple scenarios: both within base station coverage and out of coverage. The same differential AoA measurement mechanism works regardless of base station presence, providing universal positioning capability across different deployment scenarios and coverage conditions.
3Measurement precision
If multiple reference signals are used for differential AoA measurement, then positioning accuracy improves, but system complexity increases
Solution Approach 1:
The patent segments the positioning process into distinct measurement phases: first measuring AoA of reference signals from multiple UEs, then calculating the differential between these measurements. By dividing the complex task of multi-UE positioning into sequential measurement and calculation steps, the system manages complexity while achieving accurate positioning through multiple reference signals.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables accurate positioning of mobile devices even when they are out of base station coverage by utilizing differential AoA measurements, enhancing location determination accuracy and reliability.
Implementation Method 1
obtaining a differential angle-of-arrival (AoA) between (a) a first AoA of a first wireless reference signal at a second mobile device and (b) a second AoA of a second wireless reference signal at the second mobile device
Data Source
AI summary
In some implementations, a method of enabling positioning of a first mobile device may comprise obtaining a differential angle-of-arrival (AoA) between (a) a first AoA of a first wireless reference signal at a second mobile device and (b) a second AoA of a second wireless reference signal at the second mobile device. The first wireless reference signal is transmitted by a third mobile device, and the second wireless reference signal is transmitted by the first mobile device. The method also may comprise determining a position of the first mobile device based at least in part on the differential AoA. The method also may comprise providing the position of the first mobile device.