Proxy Session Control Apparatus Subscriber Profile Restoration
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Solution Overview
Problem
Existing methods for re-registering user equipment (UE) with an IP multimedia subsystem are limited to UE compatible with Release 9 or later, and cannot diagnose missing subscriber profile issues or efficiently manage network load during re-registration, particularly when the Proxy-Call Session Control Function (P-CSCF) is not operating normally.
Innovation Solution
A mobile communication system with a serving session control apparatus and a proxy session control apparatus that accepts terminating calls, relays call information, and executes restoration of the subscriber profile linked with the UE, reestablishing a session between the UE and the policy-and-charging apparatus to facilitate re-registration, regardless of the UE's release version compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the Keep-alive function is used to diagnose P-CSCF operation status, then the P-CSCF can be detected as dead or alive, but it cannot diagnose missing subscriber profile issues
Solution Approach 1:
The patent implements a feedback mechanism where the P-CSCF sends notifications to the PCRF about subscriber profile restoration status. This allows the system to detect and respond to missing subscriber profile issues by monitoring the feedback loop between P-CSCF and PCRF, enabling precise diagnosis of profile completeness beyond simple alive/dead detection.
Solution Approach 2:
The patent introduces the PCRF as an intermediary component that mediates between the P-CSCF and the subscriber profile database. The PCRF receives notifications from the P-CSCF about profile restoration and manages the subscriber profile information, acting as a mediator that enables comprehensive diagnosis of profile status including completeness and validity.
2Reliability
If all UE registered with the P-CSCF are prompted to perform re-registration when P-CSCF is diagnosed as not operating normally, then the P-CSCF can be recovered, but control signals are temporarily increased and network load becomes higher
Solution Approach 1:
Instead of forcing all UE to perform re-registration, the patent implements partial action by selectively notifying only those UE whose subscriber profiles require restoration. The P-CSCF identifies specific UE with missing or invalid profiles and sends targeted notifications, reducing the number of re-registration operations from all UE to only the necessary subset.
Solution Approach 2:
The patent implements preliminary action by proactively notifying UE about subscriber profile restoration before service disruption occurs. The P-CSCF detects profile issues and sends advance notifications to UE, allowing them to perform re-registration at a convenient time rather than forcing immediate re-registration, thus reducing network load while ensuring profile validity.
3Adaptability or versatility
If UE compatible with Release 9 or later are prompted to perform re-registration, then the re-registration can be executed according to the method, but UE compatible with Release 8 or earlier do not comply with this method
Solution Approach 1:
The patent implements universality by designing a notification mechanism that works across different UE release versions. The P-CSCF sends standardized notifications that can be processed by both Release 8 and Release 9+ UE, ensuring broad compatibility. The notification format and content are designed to be universally understood, allowing the same mechanism to serve multiple UE types without version-specific implementations.
Data Source
AI summary
A P-CSCF (310) includes a terminating call processing unit (311) which receives SIP INVITE from an S-CSCF. The SIP INVITE includes an identifier of UE, and is relayed in response to acceptance of a terminating call to the UE. The P-CSCF (310) further includes: a restoration execution unit (313) which executes restoration of a subscriber profile linked with the UE based on reception of the SIP INVITE; and an address holding unit (315) which holds an address of a PCRF included in a response received from a DRA along with the execution of the restoration. The restoration execution unit reestablishes a session between the UE and the PCRF based on the held address of the PCRF, and causes the UE to execute re-registration with an IP multimedia subsystem.