IMS Subscription Change Handling via I-CSCF Capability Check
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Solution Overview
Problem
In the IMS environment, when a subscriber's profile changes, the existing network architecture fails to ensure that the serving S-CSCF has the necessary capabilities, leading to service disruptions, unauthorized service usage, and incorrect charging, as the HSS is not aware of the capabilities of the selected S-CSCF.
Innovation Solution
A method and system that detect changes in subscription information, check the capabilities of the serving network element, and initiate a registration procedure to a new serving element with adequate capabilities, ensuring seamless service adaptation by using detection and checking means within the subscriber database.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the HSS stores only subscription information without capability awareness, then the system structure remains simple, but the serving S-CSCF may lack necessary capabilities leading to service disruptions
Solution Approach 1:
The patent introduces the I-CSCF as an intermediary component that bridges the HSS and S-CSCF. The I-CSCF receives capability information from the HSS and uses it to select appropriate S-CSCFs, thereby resolving the contradiction by adding a specialized intermediary layer rather than burdening the HSS with direct capability management
Solution Approach 2:
The patent segments the network functions by separating subscription management (HSS) from capability-based selection (I-CSCF). This segmentation allows each component to focus on its specific function, improving reliability through specialized processing while maintaining overall system simplicity
2Reliability
If the HSS is not aware of S-CSCF capabilities, then the system operates with less information processing, but capability mismatches occur causing unauthorized service usage and incorrect charging
Solution Approach 1:
The patent implements a feedback mechanism where the I-CSCF receives capability information from the HSS and uses this feedback to make informed S-CSCF selections. This ensures that capability information is not lost but rather processed and applied to prevent unauthorized service usage and ensure correct charging
3Productivity
If subscription changes are detected without capability checking, then the response time is reduced, but service disruptions occur due to inadequate S-CSCF capabilities
Solution Approach 1:
The patent applies preliminary action by having the I-CSCF check S-CSCF capabilities against the updated subscription profile before finalizing the service assignment. This advance verification prevents service disruptions while maintaining efficient subscription update processing
Data Source
AI summary
The present invention relates to a method and system for changing a subscription information of a subscriber in a data network. When a subscriber profile or subscription information is changed or updated, this is detected and a registration procedure for registering a terminal device (40) of the subscriber to a new serving network element (12) is initiated in response to the result of a checking step for checking whether a capability of a network element (10) serving a terminal device (40) of said subscriber is still in accordance with said changed subscription information. Thereby, an automatic or semi-automatic adaptation of the serving entity to the changed subscription can be achieved.