Emergency Call Service Continuity During IMS Handover
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Solution Overview
Problem
Existing systems fail to continue supporting emergency call services like eCall sessions during handovers from packet switched networks to circuit switched networks, as they do not reserve the necessary media resources in the circuit switched network, leading to disruptions in emergency services.
Innovation Solution
A method and apparatus that reserve media resources in the circuit switched network during handovers to support ongoing emergency call services, ensuring continuity of emergency call services and the transmission of minimum set of emergency related data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If handover from packet switched network to circuit switched network is performed during ongoing IMS session, then network mobility and service continuity are improved, but emergency call service support is lost due to lack of media resource reservation
Solution Approach 1:
The system performs preliminary detection of emergency call service status before handover execution, and proactively reserves media resources in the circuit switched network beforehand. This preliminary action ensures that when handover occurs, the emergency call service can continue without interruption, resolving the contradiction between service continuity and resource management complexity.
Solution Approach 2:
The patent introduces an intermediary mechanism that detects emergency call services and triggers media resource reservation. This intermediary layer between the handover process and media resource management automates the reservation process, improving emergency service reliability without significantly increasing operational complexity.
2Reliability
If media resources are reserved in circuit switched network for emergency call service, then service continuity during handover is improved, but system complexity and resource management overhead increase
Solution Approach 1:
The system implements self-service by automatically detecting when an emergency call service is active during handover and autonomously reserving the necessary media resources. This automation eliminates manual configuration complexity while ensuring reliable emergency service support, as the system serves itself without external intervention.
Solution Approach 2:
The patent employs feedback mechanisms where the system continuously monitors handover status and emergency service activity. Based on this feedback, it dynamically adjusts media resource allocation, reserving resources only when needed. This feedback-driven approach maintains service reliability while optimizing resource management and reducing unnecessary system complexity.
Data Source
AI summary
A method, apparatus and computer program product are provided to facilitate the handover from a packet switched network to a circuit switched network while an Internet protocol (IP) multimedia subsystem (IMS) session is ongoing. In the context of a method, a notification is received of the handover from a packet switched network to a circuit switched network while an IMS session is ongoing. The method also receives an indication that an emergency call service is active in the IMS session and determines that media resources in the circuit switched network are required to support the emergency call service, as supplemented by a minimum set of emergency related data, that is active in the IMS session. The method may further include causing the media resources to be reserved in the circuit switched network to support the emergency call service that is active in the IMS session.