Emergency Call Routing via Location Area Identifiers
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Solution Overview
Problem
Establishing the responsible public safety answering point (PSAP) for emergency calls from portable wireless devices is challenging due to their mobility, and accurately updating the location of these devices is critical but difficult to achieve efficiently.
Innovation Solution
A method and system that determine a location area identifier and correlate it with a coverage area identifier to identify a voice call destination number, allowing direct communication with the PSAP, using a portable computing device equipped with a positioning device and a dialing module, which can transmit location data and personal information through various networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional routing mechanisms are used for emergency calls, then call establishment is simplified, but location accuracy and PSAP routing efficiency deteriorate
Solution Approach 1:
The system performs preliminary actions by determining the location area identifier and correlating it with coverage area identifiers before the emergency call is established. This pre-processing of location data enables direct routing to the appropriate PSAP without complex real-time routing decisions, thereby improving location accuracy while maintaining routing simplicity.
Solution Approach 2:
The patent introduces location area identifiers and coverage area identifiers as intermediary elements between the portable device's physical location and the PSAP routing system. These identifiers act as mediators that translate geographic information into actionable routing data, improving location precision without requiring the routing mechanism itself to become more complex.
2Loss of time
If direct communication with PSAP is established, then call routing time is reduced, but system complexity increases
Solution Approach 1:
The system performs preliminary correlation between location area identifiers and coverage area identifiers before the emergency call is initiated. This advance preparation of routing information enables direct communication with the appropriate PSAP to be established immediately when an emergency call is made, reducing call routing time while keeping the additional complexity confined to the pre-call preparation phase.
3Measurement precision
If location updates are continuously tracked, then location accuracy is improved, but energy consumption increases
Solution Approach 1:
The system implements periodic location updates rather than continuous tracking. The portable device determines its location area identifier and correlates it with coverage area identifiers at periodic intervals or when entering new geographic zones, maintaining location accuracy while significantly reducing energy consumption compared to continuous real-time tracking.
Data Source
AI summary
A method and system of making an emergency voice call is disclosed. Location data is received from a positioning device. A location area identifier is determined. The location area identifier corresponds to a geographical area encompassing a geographical location being represented by the location data. A voice call destination number is identified. The voice call destination number is associated with the location area identifier. The voice call destination number is utilized in order to communicate with a public safety answering point.