IMS Disaster Recovery via Redundant CSCF Data Backup
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Solution Overview
Problem
Current disaster recovery solutions for IMS networks fail to effectively manage complex user data models, leading to service disruptions and reduced continuity in one-IMPU multi-IMPI, one-IMPI multi-IMPU, and multi-IMPI multi-IMPU services during recovery processes.
Innovation Solution
A method and system for disaster recovery that involves triggering a redundant CSCF to obtain and recover user backup data and service configuration data from a network storage entity, enabling seamless service restoration by backing up and transmitting necessary data to a redundant CSCF, thus ensuring continuous service for users.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the registration period is set to a short value to reduce service interruption duration, then reliability is improved, but frequent re-registration increases network processing load and consumes air-interface resources
Solution Approach 1:
The patent performs preliminary actions by backing up user data to HSS during normal operation before failure occurs. When S-CSCF fails, the redundant S-CSCF can immediately retrieve pre-backed-up data from HSS, eliminating the need for frequent re-registration and reducing network processing load while maintaining service continuity
Solution Approach 2:
The patent creates a copy of user data by backing up registration-related information (IMPI, IMPU, contact address, path information) from S-CSCF to HSS. This copying mechanism allows rapid service restoration without requiring full re-registration, reducing both service interruption and network processing load
2Device complexity
If the registration period is set to a long value to reduce re-registration frequency, then network processing load is reduced, but service interruption duration increases when S-CSCF fails
Solution Approach 1:
The system performs preliminary data backup to HSS during normal operation, so when S-CSCF fails, the redundant S-CSCF can immediately retrieve pre-backed-up user data and restore services without waiting for re-registration timer expiration, thus maintaining service continuity while reducing network processing load
3Reliability
If frequent re-registration is performed to ensure service continuity, then reliability is improved, but UE energy consumption increases and standby time decreases
Solution Approach 1:
The patent implements preliminary data backup to HSS during normal operation. When S-CSCF fails, the redundant S-CSCF retrieves pre-backed-up data immediately, eliminating the need for UE to perform frequent re-registration and associated energy consumption, thus maintaining service continuity while preserving UE battery life
4Reliability
If user data is backed up to HSS for disaster recovery, then service recovery capability is improved, but data management complexity increases due to complex user ID relationships
Solution Approach 1:
The patent uses HSS as an intermediary to manage user data backup and restoration. HSS stores registration-related user data (IMPI, IMPU, contact address, path information) and provides a standardized interface for S-CSCF to retrieve data during disaster recovery, simplifying data management despite complex user ID relationships
Data Source
AI summary
A method, apparatus, and system for disaster recovery of an Internet Protocol (IP) Multimedia Subsystem (IMS), where the method includes: triggering a redundant Call Session Control Function (CSCF); obtaining, by the redundant CSCF, user backup data of registered IMS Private User Identities (IMPIs) that are associated with IMPUs and user service configuration data of IMS Public User Identities (IMPUs) in an IMS subscription from a network storage entity of a user; and recovering, by the redundant CSCF, a corresponding service according to the obtained user backup data of the registered IMPIs and user service configuration data of the IMPUs in the IMS subscription. Hence, the one-IMPU multi-IMPI, one-IMPI multi-IMPU, or multi-IMPI multi-IMPU service can be recovered, and this enables the user to have better service continuity experiences.