HSS Reset Notification for IMS Subscriber Data Integrity
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Solution Overview
Problem
In an IP multimedia subsystem (IMS) network, subscriber data integrity is compromised during a Home Subscriber Server (HSS) reset, leading to inaccuracies due to the lack of fresh data updates during re-registration processes.
Innovation Solution
A method where the HSS transmits a system notification message to components like S-CSCF and application servers, triggering a request for fresh subscriber data, ensuring data confirmation and synchronization through Diameter messages, thereby maintaining data integrity post-reset.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the HSS performs a reset to update or maintain subscriber data, then data accuracy is improved, but data integrity is compromised during the reset period
Solution Approach 1:
The HSS sends a system notification message to the S-CSCF before resetting, marking all terminals as unconfirmed. This preliminary action ensures that the S-CSCF is prepared to request fresh data after the reset, preventing data integrity issues during and after the reset operation.
Solution Approach 2:
The system implements a feedback mechanism where the S-CSCF requests subscriber data from the HSS after receiving the system notification. The HSS responds with fresh subscriber data, and the S-CSCF marks the terminal as confirmed once it receives the updated data, creating a closed-loop feedback system that maintains data integrity.
2Reliability
If the S-CSCF requests fresh subscriber data from the HSS after an HSS reset, then data integrity is improved, but network load increases
Solution Approach 1:
Instead of continuously requesting data or requesting data for every event, the system uses periodic action triggered by the HSS reset event. The S-CSCF requests fresh subscriber data only when triggered by the system notification message from the HSS, reducing unnecessary network traffic while ensuring data integrity when needed.
Solution Approach 2:
The HSS preliminarily marks terminals as unconfirmed before resetting, which allows the S-CSCF to efficiently determine which terminals need fresh data requests. This preliminary marking prevents the S-CSCF from unnecessarily requesting data for all terminals, reducing network load while maintaining data integrity for affected terminals.
3Measurement precision
If the S-CSCF marks terminals as unconfirmed upon receiving system notification, then data synchronization is improved, but processing complexity increases
Solution Approach 1:
The S-CSCF applies local quality by marking only specific terminals as unconfirmed based on the system notification message, rather than applying a global state change. This allows the S-CSCF to maintain individual terminal states, improving data synchronization precision while keeping processing complexity manageable through targeted rather than universal processing.
Data Source
AI summary
An IMS system including a Home Subscriber Server including data for terminals connecting to the IMS. The Home Subscriber Server being arranged to transmit a reset message to components such as application servers and S-CSCF in the IMS when it undergoes a reset. The receipt of a reset message causing the component to mark the terminals that the HSS stores the data for as not confirmed. The component then, either automatically or in response to a message, transmits a message to the Home Subscriber Server to request user profile data for a user terminal connecting to the IMS or accessing services from the IMS.