Wireless Router Emergency Call Aggregation
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Solution Overview
Problem
Wireless communication systems face challenges in supporting a large number of emergency calls during crises due to limited bandwidth and infrastructure destruction, leading to bottlenecks and potential disruptions in communication between mobile users and public safety authorities.
Innovation Solution
A method and apparatus that aggregate information related to emergency calls by estimating available bandwidth and employing information aggregation techniques, such as voice frame aggregation and L2 datagram concatenation, to ensure reliable communication, even in situations where conventional routing methods fail.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional call admission and congestion control schemes are used, then network resources are managed traditionally, but emergency calls cannot be reliably completed during saturation and infrastructure destruction
Solution Approach 1:
The patent aggregates multiple emergency calls into a single logical connection, merging multiple individual call signaling and data streams into one consolidated flow. This allows the network to handle multiple emergency calls simultaneously without treating each as a separate resource-consuming connection, thereby increasing call handling capacity while maintaining reliability.
Solution Approach 2:
The aggregated connection serves multiple functions simultaneously: it carries signaling for multiple emergency calls, transmits voice data for all aggregated calls, and enables bidirectional communication with PSAPs. This multi-functionality allows a single network resource allocation to serve multiple emergency callers, improving both reliability and productivity.
2Reliability
If individual emergency calls are routed separately, then each call receives dedicated bandwidth, but network bandwidth is exhausted quickly during widespread crises
Solution Approach 1:
Multiple individual emergency calls are merged into a single aggregated connection that shares network bandwidth. Instead of allocating dedicated bandwidth to each call separately (which would exhaust resources quickly), the aggregated connection allows multiple calls to share the available bandwidth efficiently, extending the time the network can support emergency communications.
Solution Approach 2:
The network dynamically adjusts the allocation and routing of bandwidth within the aggregated connection based on real-time conditions. The system can dynamically establish, modify, and terminate individual calls within the aggregated connection as network conditions change, allowing flexible resource utilization that maintains reliability while conserving bandwidth.
3Area of stationary object
If mesh network infrastructure nodes are destroyed during emergencies, then network coverage is reduced, but remaining nodes cannot support low delay and jitter requirements
Solution Approach 1:
By aggregating multiple emergency calls into a single connection, the system reduces the number of individual packet flows that need to be maintained across the remaining network nodes. This consolidation reduces the overhead and processing requirements on each node, enabling them to maintain low delay and jitter performance even with reduced network coverage.
Solution Approach 2:
The aggregation point acts as an intermediary that consolidates multiple call streams before they reach the remaining network nodes. This intermediary function reduces the burden on individual nodes by pre-consolidating traffic, allowing the simplified network topology to maintain service quality requirements despite infrastructure loss.
4Adaptability or versatility
If all emergency calls are treated with equal priority, then fair access is maintained, but congestion cannot be resolved and timeouts occur
Solution Approach 1:
The system dynamically adjusts call admission behavior based on real-time network conditions. When the network is congested, the aggregation mechanism allows the system to make adaptive decisions about which calls to accept, modify, or delay within the aggregated connection, rather than treating all calls statically as equal. This dynamic adaptation reduces establishment time by avoiding unnecessary timeouts.
Solution Approach 2:
The network monitors conditions within the aggregated connection and provides feedback to adjust call handling strategies. Based on this feedback, the system can dynamically modify resource allocation, routing decisions, and admission policies for individual calls within the aggregation, enabling faster establishment times while maintaining adaptability to varying emergency scenarios.
Data Source
AI summary
A Wireless Router (WR) aggregates information regarding the emergency calls based on their context and routes the aggregated emergency information to the correct portal which directs the aggregated emergency to appropriate Public Safety Answering Point (PSAP). The information aggregation is automatically triggered when the number of calls exceeds the multihop capacity to the egress point. The PSAP responds to the emergency situation by sending a response message via the Portal. The WR multicast/broadcasts the response message to the mobile devices which initiated the emergency calls. The response message generally includes emergency instructions based on incident type and location. Further, a call-back list is created for users whose emergency calls were not completed. By using the call-back list PSAP personnel can initiate calls to end users to provide assistance in emergency situations.