Mobile Location Accuracy with Repeater Delay Compensation
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Solution Overview
Problem
Existing methods for determining the location of a mobile device in wireless networks, such as E-911 services, are prone to errors when a repeater is present in the network deployment, as the repeater's delay affects signal propagation time measurements, leading to inaccurate positioning.
Innovation Solution
A system and method that receive data on signal propagation times between a mobile device and base stations, account for a predetermined repeater time delay, and determine a valid mobile device position by searching a domain of possible solutions using geometrical intersection of constant delay circles, thereby compensating for the repeater's influence on signal flight time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional location determination methods (RTT, TDOA, circular lateration) are used, then location can be determined using signal propagation times, but positioning accuracy deteriorates when a repeater is present due to repeater delay affecting signal flight time measurements
Solution Approach 1:
The patent introduces a repeater delay compensation mechanism as an intermediary correction factor. The computing system receives indication information about the repeater's presence and applies predetermined repeater delay values to compensate for the repeater's time delay effect on signal propagation measurements, thereby eliminating the harmful impact on location accuracy
Solution Approach 2:
The patent modifies the signal propagation time parameter by adjusting for repeater delay. The computing system receives data characterizing signal propagation times, identifies when a repeater is involved, and corrects the propagation time measurements by applying repeater delay compensation, thereby transforming inaccurate measurements into accurate ones for location determination
2Measurement precision
If the system searches through a domain of possible position solutions to account for repeater delay, then positioning accuracy is maintained, but computational complexity increases
Solution Approach 1:
The patent applies preliminary action by receiving and storing repeater delay compensation data in advance. The computing system receives indication information about repeater presence and has predetermined repeater delay values ready to be applied immediately during location determination, avoiding the need for complex real-time analysis and reducing computational burden
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
Accurately determines the location of a mobile device even in the presence of a repeater, ensuring precise positioning by adjusting for the repeater's delay, thereby improving the reliability of location-based services.
Implementation Method 1
Enhanced Observed Time Difference of Arrival (E-OTDA) techniques where hyperbolic lateration can be used to locate a UE based on measurements of time difference in arrival of signals to a UE from at least three base stations
Implementation Method 2
A dominant signal propagation path between the mobile user and at least one of the plurality of base stations is via a repeater
Data Source
AI summary
Data characterizing signal propagation times between a mobile user and a plurality of base stations can be received. A dominant signal propagation path between the mobile user and at least one of the plurality of base stations is via a repeater. A valid mobile user position solution is determined by searching a domain of possible mobile user position solutions using the received data and a predetermined repeater time delay. The valid mobile user position solution can be provided. Related apparatus, systems, techniques, and articles are also described.