Reference Node Selection for Double Difference Positioning
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Solution Overview
Problem
Existing positioning methods for mobile devices in wireless communication systems face challenges in accurately determining the location of user equipment (UE) due to factors such as group delay errors and time synchronization issues in terrestrial based positioning.
Innovation Solution
The method involves determining compensation values for positioning reference signals (PRS) by selecting reference nodes based on coarse location information of the target UE. These reference nodes measure PRS and provide compensation values, which are then used to correct time of arrival and reference signal time difference measurements, thereby improving location accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If terrestrial based positioning methods are used to determine UE location, then positioning can be performed using existing wireless infrastructure, but group delay errors and time synchronization issues reduce measurement accuracy
Solution Approach 1:
The patent introduces reference nodes as intermediary elements between the positioning system and the target UE. These reference nodes measure positioning reference signals and provide compensation values that mediate the timing errors, allowing accurate positioning without requiring perfect time synchronization across the entire network
Solution Approach 2:
The patent changes the parameter being measured by introducing compensation values that adjust for group delay errors. Instead of directly measuring absolute time of arrival, the system measures relative time differences and applies compensation, transforming the measurement parameter to eliminate the effect of synchronization errors
2Adaptability or versatility
If reference nodes are selected based on coarse location information, then the positioning system can adapt to the UE's approximate position, but additional processing is required to determine and provide compensation values
Solution Approach 1:
The patent performs preliminary action by selecting reference nodes based on coarse location information before the actual positioning measurement. This preliminary selection ensures that the most suitable reference nodes are identified in advance, adapting the positioning system to the UE's approximate position without adding complexity during the critical measurement phase
Data Source
AI summary
Techniques are provided for selecting reference nodes for use in a double difference positioning method. An example method of determining compensation values for positioning reference signals includes receiving positioning reference signal measurements from the one or more reference nodes, and determining one or more compensation values based at least in part on the positioning reference signal measurements.