E911 Location Reporting Selects Lower Uncertainty Coordinates
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Solution Overview
Problem
Conventional E911 systems face challenges in accurately locating distressed callers due to conflicting uncertainty values from Device Based Hybrid (DBH) and Assisted Global Positioning System (A-GPS) technologies, which can obfuscate the potential search area for first responders.
Innovation Solution
The system selectively includes location information in reports based on the lower uncertainty values from DBH and A-GPS locations, ensuring that only the most accurate horizontal and vertical coordinates are transmitted to Public Safety Answering Points (PSAPs), thereby reducing the search area and enhancing the likelihood of quickly locating the caller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If both DBH and A-GPS location information are included in the location report, then the search area is further defined with additional information, but the conflicting uncertainty values obfuscate the potential search area and mislead first responders
Solution Approach 1:
The patent extracts and removes the A-GPS location information from the location report when its uncertainty values conflict with or supersede the DBH location information. This extraction resolves the contradiction by eliminating the source of confusion while preserving the more reliable DBH location data, thereby maintaining search area definition without introducing obfuscation.
Solution Approach 2:
The patent changes the parameter of location information selection based on uncertainty values. When A-GPS uncertainty values indicate lower precision or conflict with DBH measurements, the system changes its behavior to exclude A-GPS data rather than including it, thus adapting the location report content to the quality of available measurements and preventing information confusion.
2Measurement precision
If location information from multiple positioning technologies is provided, then the accuracy of location reporting is improved, but the complexity of processing and interpreting conflicting data increases
Solution Approach 1:
The system extracts and removes problematic A-GPS location data when its uncertainty characteristics indicate potential conflict with DBH measurements. This simplifies the data processing task by eliminating conflicting information rather than attempting to reconcile multiple sources, thereby reducing interpretive complexity while maintaining high accuracy through selective inclusion of reliable DBH data.
Solution Approach 2:
The patent adopts a strategy of using simple, reliable DBH location information over complex, potentially conflicting A-GPS data. By preferring the more straightforward DBH measurements when uncertainty values indicate reliability, the system achieves accurate location reporting without the burden of processing and reconciling multiple conflicting positioning technologies.
Data Source
AI summary
Systems, methods, and computer-readable media herein generate an E911 location report based on a vertical uncertainty and horizontal uncertainty associated with a device-based hybrid (DBH) location and an assisted global positioning system (A-GPS) location received from a UE device. The uncertainties may be compared determine which portions of the DBH location and the A-GPS location to include in a location report sent to a PSAP. A location report including the location information associated with the lower uncertainty can be sent to a PSAP, thus providing the most relevant and accurate information so that first responders can more effectively locate a distressed caller.