Conditional Emergency Call Setup Verification

Solution Overview

Problem

Mobile devices may inadvertently attempt emergency call setups even when there is no apparent emergency, due to rogue or faulty devices or servers sending misleading messages.

Innovation Solution

Implementing a condition-based system in mobile devices and communication networks to only proceed with emergency call setups if specific conditions are met, such as user configuration, message source verification, or service type, to prevent unnecessary emergency call attempts.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the mobile device automatically attempts emergency call setup upon receiving a 380 response with emergency child element, then emergency call establishment is enabled, but unnecessary emergency call attempts may be triggered by rogue or faulty devices

Engineering Contradiction:

Improveemergency call establishmentVSAvoidunnecessary emergency call attempts

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The mobile device performs preliminary verification by checking whether it previously sent an invite request message before automatically attempting emergency call setup. This preliminary action prevents rogue devices from triggering unnecessary emergency calls by verifying the legitimacy of the 380 response source.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system implements feedback by monitoring the correspondence between invite request messages sent by the mobile device and 380 responses received. The emergency call setup is only triggered when there is a matching feedback loop, ensuring that automatic emergency call attempts are responses to legitimate network invitations rather than rogue messages.

Inventive Principle:

Principle #23Feedback

2Speed

If the mobile device automatically attempts emergency call setup upon receiving any 380 response, then emergency response speed is improved, but system security deteriorates due to vulnerability to rogue messages

Engineering Contradiction:

Improveemergency call response speedVSAvoidsystem security

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The mobile device performs preliminary verification by checking whether it previously sent an invite request message before automatically attempting emergency call setup. This preliminary action prevents rogue devices from triggering unnecessary emergency calls by verifying the legitimacy of the 380 response source.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system implements feedback by monitoring the correspondence between invite request messages sent by the mobile device and 380 responses received. The emergency call setup is only triggered when there is a matching feedback loop, ensuring that automatic emergency call attempts are responses to legitimate network invitations rather than rogue messages.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS8315591B2System and method for conditionally attempting an emergency call setup

Publication Date: 2012.11.20 MALIKIE INNOVATIONS LTD

AI summary

A system and method are provided for a communications device to conditionally attempt an emergency call setup. The communications device maintains at least one condition for attempting emergency call setups. Upon receiving a message prompting an emergency call setup, the communications device attempts the emergency call setup only if any of the at least one conditions is satisfied. The at least one condition is defined such that the communications device does not erroneously attempt to establish an emergency call when there is no emergency. The at least one condition might for example include whether the message prompting the emergency call setup indicates a message source that is trusted by the user of the mobile device. A system and method are also provided for a communications network to block at least some of the messages from being delivered to their target communications device.