HSS Emergency Registration Maintenance During Termination
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Solution Overview
Problem
Current IMS emergency registration cannot be distinguished from normal registration in a Home Subscriber Server (HSS), leading to potential failure of emergency call backs when a user's normal registration is terminated, as there are no defined procedures for maintaining active emergency registrations during registration termination.
Innovation Solution
An apparatus and method that determine if a user is registered for an emergency service, and upon receiving a registration termination request, transmit an indication to maintain the emergency registration active, using Diameter protocol messages like Registration-Termination-Answer (RTA), ensuring the HSS keeps the user's status registered for emergency services.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If normal registration termination is performed, then normal registration is successfully terminated, but emergency registration is inadvertently terminated causing call back failure
Solution Approach 1:
The patent segments the registration termination process into two distinct paths: one for normal registrations and one for emergency registrations. The HSS examines the registration type and applies different termination logic, allowing normal registrations to be terminated while emergency registrations are preserved, thus resolving the contradiction between successful termination operation and emergency service reliability
Solution Approach 2:
The patent applies local quality by treating emergency registrations differently from normal registrations within the same termination framework. The HSS identifies emergency registrations through specific indicators and applies a protective policy only to those cases, while allowing standard termination for normal registrations, thus maintaining operational simplicity while ensuring emergency service reliability
2Reliability
If emergency registration is distinguished from normal registration in HSS, then emergency registration can be maintained during termination, but system complexity increases
Solution Approach 1:
The patent applies preliminary action by establishing distinct registration types and identification mechanisms before the termination process begins. The HSS is pre-configured to recognize emergency registration indicators, so when termination is requested, the system can immediately determine whether to apply protective measures without complex real-time analysis, thus maintaining reliability while controlling complexity
Solution Approach 2:
The patent introduces an intermediary mechanism in the form of registration type indicators and HSS examination logic that mediates between the termination request and the actual termination action. This intermediary layer allows the system to differentiate between emergency and normal registrations without fundamentally restructuring the entire HSS architecture, thus achieving emergency registration maintenance with minimal complexity increase
Data Source
AI summary
The invention relates to a session control entity, subscription entity, methods and computer programs for transmitting a request to terminate a registration of a user, determining if the user is registered for an emergency service, for maintaining the user registered for the emergency service, if based on the determination the user is registered for the emergency service, and transmitting an indication indicating that the user is registered for an emergency service if based on the determination the user is registered for the emergency service.