Altitude Uncertainty Filtering for E911 Location Reporting
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Solution Overview
Problem
Conventional E911 systems face challenges in accurately locating distressed callers due to significant altitude uncertainty values, which can lead to inaccurate or misleading location reports, hindering first responders' efforts to find the caller.
Innovation Solution
Implementing uncertainty-based altitude filtering in E911 systems, where location reports to PSAPs include only relevant and accurate location information by comparing altitude and uncertainty values to thresholds, ensuring that only reliable data is transmitted, such as including horizontal coordinates with low altitude uncertainty and excluding altitude information with high uncertainty.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If altitude information is included in location reports regardless of uncertainty values, then more complete location data is provided to PSAPs, but the accuracy and reliability of location information deteriorates due to significant altitude uncertainty
Solution Approach 1:
The system dynamically changes the parameter of information inclusion based on the uncertainty value. When altitude uncertainty exceeds a threshold, the altitude component is excluded from the location report. This parameter-based filtering ensures that only reliable location data is transmitted, resolving the contradiction between providing complete location information and maintaining accuracy.
2Loss of information
If estimated location with high altitude uncertainty is transmitted to PSAP, then the search area definition is enhanced with additional information, but the usefulness of location information deteriorates by obfuscating the potential area where caller may be located
Solution Approach 1:
The system extracts and removes the unreliable altitude component from the location report when its uncertainty value exceeds the threshold. By taking out only the problematic portion (altitude with high uncertainty) while retaining reliable components (horizontal coordinates), the system maintains search area definition without compromising reliability.
3Quantity of substance
If all location components are included in E911 location report, then comprehensive location data is available to first responders, but the complexity of processing and interpreting location data increases
Solution Approach 1:
The system applies partial action by selectively including only the necessary and reliable location components in the report. Instead of transmitting all available location data regardless of quality, it transmits a filtered subset that is sufficient for emergency response while reducing processing complexity.
Data Source
AI summary
Systems, methods, and computer-readable media herein generate an E911 location report based on an altitude or an altitude uncertainty associated with an estimated location received from a UE device. The altitude and altitude uncertainty may be compared to determined thresholds to determine which portions of the estimated location to include in an E911 location report sent to a PSAP. A location report generated to include the location information that is based on evaluating the altitude and altitude 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.