Emergency SMS Location Timing for Accurate PSAP Routing
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Solution Overview
Problem
Existing systems fail to ensure accurate location determination of user equipment (UE) during emergency texts, leading to incomplete or incorrect location reporting, which prevents connection to the appropriate Public-Safety Answering Point (PSAP) and results in bounce-back messages.
Innovation Solution
A timer is initiated upon sending an SMS to an emergency number, with location recalculations occurring until the uncertainty is within a threshold or the timer expires, ensuring accurate location determination before message transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If location determination is performed immediately before SMS transmission to emergency number, then response time is reduced, but location accuracy deteriorates due to insufficient calculation time
Solution Approach 1:
The system performs preliminary location determination calculations before the SMS message is actually transmitted to the emergency number. A timer is started when the user initiates the emergency text, and location calculations are performed during this period. The location data is then included in the SMS message when it is sent, ensuring both timely transmission and accurate location information.
2Measurement precision
If location recalculation continues until threshold is met, then location accuracy is improved, but communication delay increases
Solution Approach 1:
The system implements a feedback mechanism where the location uncertainty is continuously monitored during calculation. When the location uncertainty falls below a predetermined threshold, the recalculation process stops and the SMS message is transmitted. This feedback-controlled approach ensures that location accuracy is sufficient without unnecessarily extending the communication delay.
3Measurement precision
If location uncertainty threshold is set low, then location reporting accuracy is improved, but probability of bounce-back messages increases due to timeout
Solution Approach 1:
The system dynamically adjusts the location uncertainty threshold parameter based on the specific emergency situation and network conditions. By optimizing this parameter, the system achieves a balance between location reporting accuracy and message delivery reliability, reducing bounce-back messages while maintaining sufficient location precision for emergency response.
Data Source
AI summary
Systems, methods, and computer-readable media are provided for delaying communication of a short message service (SMS) message to an emergency number until a location of user equipment (UE) is determined. A network-side server receives an SMS message addressed to an emergency number along with an initial location estimate from the UE. The server initiates a timer and transmits one or more location update requests to the UE. While the timer is active, the server receives updated location information and evaluates the associated uncertainty. Once the uncertainty satisfies a threshold or the timer expires, the server forwards the SMS message to the emergency number along with a location of the UE.