Emergency Call Routing for Roaming Wireless Devices
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Solution Overview
Problem
Existing wireless network technologies face challenges in providing reliable emergency call services to roaming mobile users, especially when they are unauthenticated, as they require immediate access without compromising network security and ensuring illicit access is prevented.
Innovation Solution
Implementing a system that allows emergency call services over VoIP in wireless networks, such as WiMAX, by using a VoIP call agent and location servers to connect unauthenticated or authenticated mobile devices to the nearest public safety answering point (PSAP) while filtering non-emergency services for unauthenticated users, ensuring immediate access without full authentication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If emergency call services are provided to unauthenticated mobile devices, then immediate access to emergency services is enabled, but network security may be compromised
Solution Approach 1:
The patent segments network access into two distinct modes: emergency service access for unauthenticated devices and full network access for authenticated devices. The system creates separate service channels where emergency calls are routed through specific infrastructure (PSAP) while other network resources remain protected, thus enabling emergency service availability without compromising overall network security.
Solution Approach 2:
The patent introduces an intermediary authentication system that mediates between unauthenticated emergency callers and the network. The system uses location servers and call agents as intermediaries to verify emergency call legitimacy and route them appropriately, while maintaining security barriers that prevent unauthorized access to non-emergency services.
2Reliability
If full authentication is required before providing services, then network security is maintained, but emergency call access is delayed
Solution Approach 1:
The patent implements preliminary action by pre-configuring emergency service routing infrastructure before authentication occurs. Location servers and call agents are预先 positioned to immediately handle emergency calls upon detection, bypassing the authentication queue. This allows emergency services to be initiated instantly while authentication processes run parallel without blocking the emergency call path.
3Adaptability or versatility
If unauthenticated users are allowed network access, then emergency services are available, but illicit access to non-emergency services may occur
Solution Approach 1:
The patent applies local quality by providing different service qualities to different user groups within the same network. Unauthenticated users receive a restricted service quality limited to emergency calls through PSAP, while authenticated users receive full network access. The system implements local access control policies that permit emergency services at specific network nodes while blocking other services for unauthenticated devices.
Solution Approach 2:
The patent implements partial action by granting unauthenticated users only the specific subset of services they need (emergency calls) rather than full network access. The system provides exactly enough access for emergency purposes while deliberately withholding access to other network resources, thus enabling emergency service adaptability without creating opportunities for illicit access to non-emergency services.
Data Source
AI summary
A method and apparatus for emergency call services for wireless network roaming. An embodiment of a method includes receiving a request for an emergency telephone call from a mobile device, the mobile device communication over the Internet, the mobile device roaming in a visited wireless network when the emergency call is made. The method further includes establishing a session for an emergency services call and connecting the mobile device to emergency services.