Mobile Device Position Fix Retrieval for Location Queries
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Solution Overview
Problem
Existing location-based services face challenges in providing position fixes when satellite and wireless data is unavailable, such as in enclosed areas or network failures, necessitating a system to utilize previously-calculated position fixes effectively.
Innovation Solution
A mobile computing device system and method that selectively uses previously-calculated position fixes to respond to location-based queries by determining their suitability based on criteria like time elapsed, speed, and location uncertainty, allowing for the processing of location-based queries even without current position data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If real-time wireless data or satellite data is used for location-based services, then position fix accuracy is improved, but service availability deteriorates in scenarios where wireless service or satellite signals are unavailable
Solution Approach 1:
The system performs preliminary actions by calculating and storing position fixes in advance when satellite or wireless data is available. These pre-calculated position fixes are stored in memory and can be retrieved and used later when real-time positioning data is unavailable, ensuring continuous service availability while maintaining reasonable accuracy.
2Reliability
If previously-calculated position fixes are used when real-time data is unavailable, then service availability is improved, but position fix accuracy deteriorates
Solution Approach 1:
The system implements feedback mechanisms by evaluating the suitability of previously-calculated position fixes before using them. Criteria such as time elapsed since the last position fix, device motion state, and location uncertainty are assessed to determine whether a stored position fix is still valid and accurate enough for the current query, thus balancing availability with accuracy.
3Adaptability or versatility
If a configurable location determination scheme is implemented to selectively use previously-calculated position fixes, then adaptability is improved, but device complexity increases
Solution Approach 1:
The system applies dynamics by making the location determination scheme configurable and adaptive. The device can dynamically adjust its behavior based on operational context, user preferences, and environmental conditions, selecting appropriate positioning strategies (real-time satellite, real-time wireless, or previously-calculated fixes) without requiring complex manual configuration or intervention.
Data Source
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AI summary
A computing device is provided for responding to a location-based query. The computing device receives the query, determines that a current position fix is unavailable, retrieves from memory a previously-calculated position fix calculated before receipt of the location-based query, and provides a response to the query based on the previously-calculated position fix.