GPS Engine Anticipation for Emergency Call Positioning
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Solution Overview
Problem
Current satellite-based position location systems face challenges in achieving accurate position fixes quickly, often requiring a trade-off between accuracy and acquisition speed, which is detrimental in emergency services or value-added services sessions.
Innovation Solution
The method involves starting a GPS engine in anticipation of a future RRLP Measure Position Request message, receiving and responding to RRLP messages while continuing position determination, and optimizing satellite selection based on orthogonality and environmental characteristics to enhance accuracy without increasing acquisition time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional GPS acquisition methods are used, then position accuracy can be achieved, but acquisition time increases which is detrimental in emergency services
Solution Approach 1:
The patent applies preliminary action by starting the GPS engine in anticipation of a future RRLP Measure Position Request message before it is actually received. This proactive approach allows the GPS acquisition process to begin earlier, reducing the actual acquisition time when the position is needed for emergency services without compromising accuracy requirements
Solution Approach 2:
The patent implements dynamics by optimizing satellite selection based on orthogonality and environmental characteristics. The system dynamically adjusts which satellites are used for position calculation based on real-time conditions, selecting satellites that provide optimal geometric diversity and signal quality, thereby improving acquisition speed while maintaining accuracy
2Loss of time
If GPS engine is started early in anticipation of position requests, then acquisition time is reduced, but energy consumption increases
Solution Approach 1:
The GPS engine is started in anticipation of future position requests based on detecting triggering events such as emergency services calls or value-added services sessions. This selective preliminary action only activates the GPS engine when service types are detected that require fast position acquisition, thereby reducing acquisition time for critical services while avoiding unnecessary energy consumption during regular services
Solution Approach 2:
The system dynamically manages GPS engine operation by continuously monitoring for triggering events and adjusting engine state accordingly. The GPS engine is activated only when emergency or value-added services are detected, and deactivated when not needed, creating a dynamic energy management strategy that balances acquisition time requirements with energy conservation
3Measurement precision
If more satellites are used for position calculation, then position accuracy is improved, but processing complexity and time increase
Solution Approach 1:
The patent applies local quality by optimizing satellite selection based on specific local conditions including orthogonality relationships between satellites and environmental characteristics. Instead of using all available satellites uniformly, the system selects a subset of satellites that provide optimal local geometric diversity and signal quality for the specific environmental context, improving accuracy while reducing processing complexity
Solution Approach 2:
The system dynamically selects and reconfigures the set of satellites used for position calculation based on real-time conditions. The satellite selection changes adaptively according to signal availability, geometric relationships, and environmental factors, allowing the system to maintain high accuracy with minimal processing complexity by using only the most effective satellites for each specific situation
Data Source
AI summary
An implementation of a system, device and method for communicating location data of a mobile station, enhancing location data, optimally communicating Assistance Data, and/or reducing rebids of Measure Position Request messages in a wireless network.