Access Control Device for Emergency Session Handling
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Solution Overview
Problem
In natural disaster scenarios, a large number of emergency calls can overwhelm the limited connections between a service provider network and a Public Safety Answering Point (PSAP), leading to blocked calls and wastage of resources in establishing packet connections.
Innovation Solution
An access control device in the access network maintains a database of PSAPs, determining the location of a user device and assessing the connection load of associated PSAPs to reject additional emergency call requests when capacity is reached, thereby preventing resource wastage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the access network establishes packet connections for emergency calls to the provider network, then emergency call service is provided to users, but resources are wasted when PSAP connection capacity is exceeded
Solution Approach 1:
The access control device performs preliminary assessment of PSAP connection capacity before establishing packet connections for emergency calls. By checking the database of PSAPs and their current connection loads in advance, the system prevents wasteful establishment of connections that would be rejected due to capacity limits, thus resolving the contradiction between providing emergency service and avoiding resource waste.
2Adaptability or versatility
If the access network allows all emergency call requests through, then all users can access emergency services, but PSAP resources become overwhelmed during high-demand scenarios
Solution Approach 1:
The system implements feedback by continuously monitoring the connection load of PSAPs and using this information to control access to emergency services. The access control device queries the database of PSAPs to determine current connection loads and adjusts packet connection establishment accordingly, preventing PSAP overload while maintaining emergency service access within capacity limits.
Solution Approach 2:
The access control mechanism dynamically adjusts its behavior based on real-time PSAP connection capacity. Rather than using a static allow-all or block-all approach, the system adapts packet connection establishment decisions based on current network conditions and PSAP load levels, resolving the contradiction between maintaining broad access and ensuring service reliability.
3Productivity
If the access control device monitors PSAP connection loads, then resource utilization is optimized, but system complexity increases
Solution Approach 1:
The patent introduces a database of PSAPs as an intermediary that stores connection capacity information. Rather than requiring complex real-time communication and coordination between access control devices and multiple PSAPs, the database serves as a centralized information repository that simplifies the monitoring and decision-making process, achieving efficient resource utilization while managing system complexity.
Data Source
AI summary
An access control device may include logic configured to receive a request from a user device to set up a packet connection for an emergency session to a packet data network via an access network. The logic may be further configured to determine a location associated with the user device; identify a public safety answering point associated with the determined location; determine whether a connection capacity associated with the identified public safety answering point has been reached; and reject the request to set up the packet connection for the emergency session, in response to determining that the connection capacity associated with the identified public safety answering point has been reached.