Presence Server for Emergency Positioning in IP Networks
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Solution Overview
Problem
In emergency call scenarios, especially in fixed IP networks and WLANs, accurately determining the user's location is challenging due to large geographic areas served by individual cells and interconnected campuses, making it difficult for emergency personnel to pinpoint the user's position.
Innovation Solution
A method and system that allow users to provide a human-readable address, which is received and routed to a public safety answering point (PSAP) through a presence server, enabling easier and more accurate positioning by bypassing traditional location determination methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional location determination methods are used in fixed IP networks and WLANs, then network connectivity is established, but user position information accuracy deteriorates due to large geographic areas served by individual cells
Solution Approach 1:
The patent introduces a presence server as an intermediary component that collects and manages user-defined position information (human-readable addresses) separately from the network connectivity infrastructure. This mediator allows the PSAP to obtain accurate position information without being constrained by the large geographic coverage areas of fixed IP networks and WLANs, resolving the contradiction between network coverage area and position accuracy.
2Measurement precision
If user-defined position information is collected through presence server, then position accuracy for emergency personnel is improved, but system complexity increases due to additional presence publication and subscription mechanisms
Solution Approach 1:
The patent leverages the existing presence server infrastructure, originally designed for general presence information management, to also handle emergency position information collection. By making the presence server multi-functional, the system achieves accurate position information for emergency personnel without adding dedicated new components, thus reducing the increase in system complexity while maintaining high position accuracy.
Solution Approach 2:
Users automatically publish their presence information including human-readable addresses to the presence server during normal operations. When emergencies occur, the PSAP simply subscribes to this existing presence information through standard protocols, and the system self-services the position information delivery without requiring additional manual intervention or complex emergency-specific infrastructure.
3Ease of operation
If human-readable addresses are used for positioning, then ease of operation for emergency personnel is improved, but reliance on user-provided information increases system vulnerability to incorrect or missing data
Solution Approach 1:
Users publish their presence information including accurate human-readable addresses to the presence server in advance during normal operations, before any emergency occurs. This preliminary action ensures that when emergencies happen, the PSAP can immediately retrieve pre-validated position information without relying on user input during the critical emergency response moment, thereby maintaining ease of operation while improving data reliability through prior verification.
Data Source
AI summary
The invention relates to a system and a method. In the method publication of presence information associated with a user is received by a presence server, the presence information comprises a human-readable address for the user. A request for establishing an emergency session from the user is received to a session processing server, which routes the emergency session to a public safety answering point node. In response to receiving the emergency session, the public safety answering point node sends a subscription for at least part of the presence information to the presence server, the at least part of the presence information comprising the human-readable address for the user. The presence server provides in response the at least part of the presence information to the public safety answering point node.