Bounded Localization for Vertical Positioning Accuracy
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Solution Overview
Problem
Current positioning techniques in wireless communications, such as those used in New Radio (NR), face challenges in achieving accurate vertical positioning, especially in indoor and industrial environments, due to sensitivity to measurement errors and reliance on external sensors.
Innovation Solution
A bounded localization method is proposed, where localization constraints are determined for an expected vertical range, and carrier-phase measurements are used to estimate the vertical position of user equipment (UE). This method compares the estimated position with the constraints and performs actions to improve accuracy when the position is outside the expected range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If carrier-phase positioning measurements are used to estimate vertical position, then positioning accuracy is improved, but sensitivity to measurement errors increases
Solution Approach 1:
The system performs preliminary actions by determining localization constraints (upper and lower bounds) for the expected vertical range before conducting positioning measurements. These constraints are established based on knowledge of the deployment environment, such as building heights or operational zones, and are used to validate and correct positioning estimates before final positioning results are generated
Solution Approach 2:
The system implements feedback by comparing the estimated vertical position against the pre-determined localization constraints. When the estimated position falls outside the expected vertical range, the system generates feedback to identify potential measurement errors and triggers corrective actions such as requesting additional measurements or applying error correction algorithms
2Reliability
If localization constraints are applied to bound vertical position estimates, then positioning reliability is improved, but system complexity increases
Solution Approach 1:
The system changes parameters by introducing localization constraints as additional boundary parameters that define the valid vertical range. These constraints are simple numerical values (upper and lower bounds) that can be easily configured based on deployment scenarios, allowing the system to improve reliability without requiring complex algorithmic changes
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
The bounded localization method significantly improves the accuracy of vertical positioning, reducing errors in the z-domain and overall 3D positioning, while also enhancing the robustness of positioning in challenging environments.
Implementation Method 1
Rel-18 will include a new NR positioning technique called carrier-phase positioning
Data Source
AI summary
A network device determines localization constraint(s) for an expected vertical range over which a UE may be positioned. The network device estimates vertical position of the UE. The network device compares the estimated vertical position with the localization constraint(s). The network device performs different actions depending on whether the estimated vertical position is within or outside the localization constraint(s). The network device may be the UE 110, a location server (e.g., LMF), or an LMC as implemented by the RAN node.