E911 DBH Location Uncertainty Handling

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional E911 systems face challenges in accurately locating distressed callers due to high horizontal uncertainty values in Device Based Hybrid (DBH) location information, which can significantly increase the search area for first responders, making it difficult to quickly locate the caller.

Innovation Solution

The system takes into account the horizontal uncertainty value associated with the DBH location and sends alternative location information, such as Cell Identity (CID) or Enhanced Cell Identity (E-CID), to a Public Safety Answering Point (PSAP when the uncertainty reaches a threshold value, reducing the potential search area by using geographical coordinates associated with the serving base station.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If DBH location information is used for E911, then location accuracy is improved, but horizontal uncertainty increases the search area

Engineering Contradiction:

Improvelocation accuracyVSAvoidsearch area

Core Design Contradiction:

Measurement precisionVSArea of stationary object

Solution Approach 1:

The system dynamically selects between DBH location and alternative location methods based on the horizontal uncertainty value. When DBH uncertainty exceeds a threshold, the system switches to alternative methods like E-CID or CID, making the location system adaptive to uncertainty conditions rather than static

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes the location determination parameters by switching from DBH (Device Based Hybrid) to alternative methods (E-CID or CID) when the horizontal uncertainty parameter exceeds a threshold, thereby changing the fundamental approach to location determination based on measured uncertainty

Inventive Principle:

Principle #35Parameter changes

2Area of stationary object

If alternative location information (CID/E-CID) is used, then search area is reduced, but location accuracy may decrease

Engineering Contradiction:

Improvesearch areaVSAvoidlocation accuracy

Core Design Contradiction:

Area of stationary objectVSMeasurement precision

Solution Approach 1:

The horizontal uncertainty value serves as an intermediary parameter that mediates the selection between DBH location and alternative location methods. This intermediary measurement enables the system to choose the appropriate location source based on actual uncertainty conditions

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The system uses feedback from the horizontal uncertainty measurement to determine whether to use DBH location or alternative location methods. This feedback mechanism ensures that location information is selected based on actual performance characteristics rather than fixed rules

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS11671814B1E-911 methods and systems for DBH horizontal uncertainty

Publication Date: 2023.06.06 T MOBILE INNOVATIONS LLC

AI summary

In various examples, upon successful transmission of a device-based hybrid (DBH) location from a UE to a cellular network upon that UE placing an Enhanced 911 (E911) call, a horizontal uncertainty associated with the DBH location is taken into account. If that uncertainty reaches a threshold value, alternative location information in the form of one or more of a Cell Identity (CID) or an Enhanced Cell Identity (E-CID) associated with the UE can be used in generating a location report that is then sent to a Public Safety Answering Point. As a result, first responders may be able to more quickly locate distressed E911 callers.