DTMF Location Update for Emergency Call Routing
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Solution Overview
Problem
Establishing the responsible public safety answering point 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 utilize a portable computing device equipped with a positioning device and a voice link to transmit dual-tone multi-frequency (DTMF) signals to a call center when changes in longitude or latitude exceed a predetermined range, allowing the call center to calculate new location coordinates and update location information in real-time, thereby directly contacting the responsible public safety answering point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional routing mechanisms are used for emergency calls, then call routing is standardized and reliable, but location updates are delayed and inefficient
Solution Approach 1:
The patent segments the location update process by implementing threshold-based triggering (0.0045 degrees for latitude, 0.0090 degrees for longitude). Instead of continuous updates, the system divides the monitoring space into discrete thresholds and only initiates communication when these segmented thresholds are crossed, reducing unnecessary transmissions while maintaining reliable location tracking.
Solution Approach 2:
The system implements periodic location monitoring with DTMF tone transmissions triggered by location changes. Rather than continuous real-time updates, the patent uses periodic checks combined with event-triggered DTMF transmissions during active calls, creating an efficient periodic action pattern that balances reliability with time efficiency.
2Measurement precision
If continuous location monitoring is implemented, then location accuracy is maintained, but energy consumption and network traffic increase
Solution Approach 1:
The patent applies partial action by implementing threshold-based location monitoring. Instead of continuously monitoring and transmitting every location change, the system only triggers DTMF transmissions when location changes exceed predetermined thresholds (0.0045 degrees latitude, 0.0090 degrees longitude). This partial monitoring approach maintains sufficient location accuracy while significantly reducing energy consumption and network traffic.
Solution Approach 2:
The system changes the monitoring parameters dynamically based on call status and location change magnitude. During active emergency calls, the system is more sensitive to location changes. The patent modifies the effective monitoring threshold based on whether a call is active, creating parameter changes that optimize both accuracy and energy usage根据不同 call states.
3Productivity
If DTMF signals are transmitted for every location change, then location updates are frequent and accurate, but network bandwidth is consumed
Solution Approach 1:
The patent segments the location update transmissions by implementing geographic thresholds. Instead of transmitting for every minor location change, the system divides the monitoring space into threshold boundaries (0.0045 degrees latitude, 0.0090 degrees longitude) and only triggers DTMF signals when these segmented boundaries are crossed, reducing network data volume while maintaining productive location tracking.
Solution Approach 2:
The system uses periodic location checking combined with event-triggered DTMF transmission. Rather than continuous transmission, the patent implements periodic monitoring with transmissions only when location changes exceed thresholds during active calls, creating an efficient periodic pattern that reduces network bandwidth consumption while maintaining adequate update frequency.
Data Source
AI summary
A method and system of updating location information of a portable computing device is disclosed. Location data is received from a positioning device. A voice link is utilized for communication between the portable computing device and a call center. A dual-tone multi-frequency signal is mapped to a pre-determined range of movement. The dual-tone multi-frequency signal is transmitted to the call center when a longitude measurement in the location data indicates a change in longitude that is within the pre-determined rage of movement. The dual-tone multi-frequency signal is transmitted as an indicator of longitude change of location of the portable computing device. In addition, the dual-tone multi-frequency signal is transmitted to the call center when a latitude measurement in the location data indicates a change in latitude that is within the pre-determined rage of movement. The dual-tone multi-frequency signal is transmitted as an indicator of latitude change of location of the portable computing device.