Wireless Device Positioning With LoS-Indicated Measurements
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Solution Overview
Problem
Indoor factory deployments face challenges in achieving high accuracy positioning due to the dominance of Non-Line of Sight (NLoS) components, which introduce timing errors and compromise positioning estimation in 5G NR systems.
Innovation Solution
A method is introduced to identify and prioritize Line of Sight (LoS) components in positioning measurements by detecting and quantifying LoS and NLoS components, and reporting measurement results based on LoS components to reduce timing errors and improve accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If positioning measurements are performed in indoor factory deployments with metal objects in transmission paths, then coverage is improved, but positioning accuracy deteriorates due to dominant NLoS components
Solution Approach 1:
The patent segments the received radio signal into multiple path components (LoS and NLoS) and processes them separately. The wireless device identifies and selects only the LoS component for positioning measurements, excluding NLoS components that would otherwise dominate in indoor factory environments with metal objects.
Solution Approach 2:
The patent converts the harmful effect of multipath propagation into a benefit by using signal processing techniques to identify and isolate the LoS component within the multipath signal. The measurement report includes an indication that the measurement is based on a LoS component, turning the previously harmful NLoS-dominated environment into a usable positioning scenario.
2Power
If NLoS components are used for positioning measurements, then signal strength is improved, but timing accuracy deteriorates due to larger propagation delays
Solution Approach 1:
The patent segments the received signal into LoS and NLoS components and selectively uses only the LoS component for timing-based positioning measurements. This segmentation allows the system to achieve both adequate signal strength and accurate timing by excluding the delayed NLoS components from the measurement process.
Solution Approach 2:
The patent introduces an intermediary mechanism (LoS indication in measurement report) that mediates between the strong but inaccurate NLoS signals and the positioning accuracy requirement. The network node uses this indication to identify and rely on LoS-based measurements while filtering out NLoS measurements.
3Quantity of substance
If all positioning measurements are reported without distinction, then measurement quantity is improved, but positioning reliability deteriorates due to inclusion of NLoS measurements
Solution Approach 1:
The patent segments measurement reports into those based on LoS components and those based on NLoS components by including a LoS indication. This segmentation allows the network node to prioritize or selectively use only the reliable LoS-based measurements for positioning estimation, improving overall reliability while maintaining the ability to process multiple measurements.
Solution Approach 2:
The patent introduces feedback through the LoS indication in the measurement report, which provides the network node with information about the quality and reliability of each measurement. This feedback enables the network node to make informed decisions about which measurements to use for positioning, thereby improving reliability.
Data Source
AI summary
A method is disclosed, performed by a first wireless node, such as a wireless device, for enabling positioning of the wireless device. The method comprises providing, to a network node, a measurement report comprising a positioning measurement based on one or more reference signals transmitted from one or more second wireless nodes, such as base stations. The measurement report comprises an indication as to whether the positioning measurement is performed on a Line of Sight, LoS, component of the one or more reference signals.