Location Management Function Timing Error Correction for 5G Positioning
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Solution Overview
Problem
Current 5G NR networks face challenges in accurately determining the physical location of user equipment (UE) due to timing errors associated with devices and signals used in positioning operations, which affect the precision of techniques like DL-TDOA, UL-TDOA, and multi-RTT.
Innovation Solution
Implementing a location management function (LMF) that accounts for effective timing errors by receiving and providing indications of these errors to UE and base stations, using methods such as LTE Position Protocol (LPP) messages and System Information Blocks (SIB), to correct positioning calculations and improve accuracy across various positioning techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If timing errors are not corrected in positioning operations, then positioning techniques can be implemented, but location accuracy deteriorates
Solution Approach 1:
The LMF performs preliminary actions by calculating and preparing timing error corrections before they are needed for positioning. The system pre-computes the effective timing errors based on device characteristics and signal propagation models, storing them for later application in positioning calculations to correct timing errors and improve location accuracy.
Solution Approach 2:
The system implements feedback mechanisms where the LMF receives timing error indications from network components, processes this information, and provides corrected positioning data back to UEs and base stations. This feedback loop continuously refines positioning accuracy by incorporating real-time timing error information into the positioning calculations.
2Measurement precision
If timing error corrections are implemented, then location accuracy improves, but system complexity increases
Solution Approach 1:
The LMF serves as an intermediary component that handles the complexity of timing error calculations and corrections. Rather than requiring each UE and base station to independently manage complex timing error compensation, the LMF centralizes this functionality, receiving timing error indications, processing corrections, and distributing refined positioning information to reduce overall system complexity while maintaining high location accuracy.
Data Source
AI summary
A location management function (LMF) of a network provides timing errors to user equipment and/or base stations for positioning purposes. The LMF receives an indication of an effective timing error for a downlink time difference of arrival (DL-TDOA) positioning technique, wherein the effective timing error is associated with a set of base stations configured to transmit positioning reference signals for the DL-TDOA and provides the effective timing error to a user equipment (UE) performing operations related to the DL-TDOA.