Emergency Call Header Detection for Priority Handling
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Solution Overview
Problem
Current emergency call systems in mobile communications face challenges in identifying and prioritizing emergency calls, particularly when users are in stressful situations, leading to potential session interruptions and misclassification of emergency callbacks, which can hinder timely and effective emergency response.
Innovation Solution
The system employs a processor executing computer-executable instructions to detect emergency call headers in data packet communications, ensuring priority handling for emergency calls initiated by or received from a Public Safety Access Point (PSAP), even if the user equipment (UE) does not initially recognize the call as an emergency, by using headers like P-Asserted-Identity and Priority settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the system relies on user equipment to initially recognize emergency calls, then normal call handling procedures are maintained, but emergency calls may be misclassified or interrupted leading to delayed response
Solution Approach 1:
The system performs preliminary action by pre-configuring the network to insert emergency identification headers (such as P-Asserted-Identity headers containing 'emergency' indicators) into call setup messages before the user equipment receives them. This allows the network to proactively mark emergency calls, ensuring they are reliably identified and prioritized before any potential misclassification by the UE can occur.
Solution Approach 2:
The system implements feedback mechanisms where the network monitors call characteristics and continuously adjusts header insertion based on call patterns. The network receives feedback about call outcomes and refines its emergency call detection algorithms, improving the reliability of emergency call identification over time while maintaining appropriate response times.
2Loss of time
If the system prioritizes all incoming calls from PSAP without verification, then emergency response time is reduced, but normal calls may be incorrectly prioritized causing resource misallocation
Solution Approach 1:
The system applies local quality by inserting specific emergency identification headers (such as P-Asserted-Identity with emergency indicators, or Priority headers with emergency values) only into actual emergency call messages. This localized marking ensures that only calls requiring emergency prioritization receive special treatment, preventing resource misallocation while maintaining fast response for genuine emergencies.
Solution Approach 2:
The system changes parameters by modifying call header fields (such as setting Priority header to emergency values or inserting specific P-Asserted-Identity indicators) to distinguish emergency calls from normal calls. These parameter changes enable the network to dynamically adjust resource allocation based on call urgency without permanently configuring all PSAP calls as emergencies.
3Reliability
If the system implements comprehensive header detection and priority handling, then emergency call reliability is improved, but device complexity increases
Solution Approach 1:
The system implements self-service by enabling user equipment to automatically detect emergency headers (such as P-Asserted-Identity or Priority headers) in incoming call messages and autonomously execute priority handling procedures. The UE's call management module independently identifies emergency indicators and triggers appropriate responses without requiring complex external control systems, thereby improving reliability while minimizing added device complexity.
Data Source
AI summary
A mobile device/UE identifies calls to or callbacks from a Public Safety Access Point (PSAP) to provide priority handling. When the UE does not detect that the call being made is an emergency call, then the network facilitates identification during call establishment of the emergency nature. The network identifies the call as emergency call in a SIP response by setting the Priority header to a distinctive value (e.g., “emergency-call”) or the “P-Asserted-Identity” to a distinctive value (e.g., “urn:services:sos”). When the PSAP chooses to call back the mobile/UE, the mobile/UE can terminate any ongoing calls and accept this call from the PSAP and can disable other supplementary services (e.g., call waiting, three-way calling, etc.) during the call. A P-Asserted-Identity of the incoming call is set to a distinctive location associated with the PSAP (e.g., “urn:services:sos”). Alternatively, the incoming call has a Priority header set to a distinctive value (e.g., “emergency”, “emergency-callback”).