SCSCF Abnormal AS Handling via Substitute CDR
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Solution Overview
Problem
In IP Multimedia Subsystems (IMS) networks, abnormalities in Application Servers (AS) lead to inaccurate charging and reduced accuracy in operation and maintenance analysis due to the lack of recording related information in Charging Data Records (CDRs), resulting in charging losses and revenue impact for operators.
Innovation Solution
A method and system where the Serving Call Session Control Function (SCSCF) sends Accounting Request (ACR) messages to the Charging Data Function (CDF) with information about abnormal AS, including Attribute ValuePairs (AVPs) containing host names and statuses, allowing the CDF to fill Charging Data Records (CDRs) with this information, enabling accurate charging and maintenance analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the SCSCF continues the session by bypassing an abnormal AS, then service interruption is reduced and user satisfaction is improved, but charging accuracy deteriorates because no CDR is generated for the abnormal AS
Solution Approach 1:
The patent introduces an intermediary mechanism where the SCSCF, upon detecting an abnormal AS, generates a substitute CDR record that captures the charging information that would otherwise be lost. This intermediary CDR acts as a placeholder that preserves charging accuracy while allowing the session to continue through the abnormal AS bypass. The CDF receives and processes this substitute CDR, ensuring accurate charging without interrupting service.
Solution Approach 2:
The patent applies preliminary action by having the SCSCF proactively generate and send a substitute CDR to the CDF before the session fully progresses through the abnormal AS. This preliminary charging record creation ensures that charging information is captured in advance, preventing any gap in charging data while the session continues with the abnormal AS bypassed.
2Measurement precision
If the SCSCF terminates the session when an AS abnormality is detected, then charging accuracy is maintained, but service continuity deteriorates causing user dissatisfaction
Solution Approach 1:
The substitute CDR mechanism serves as an intermediary that decouples the relationship between AS abnormality detection and session termination. By introducing this intermediate charging record, the system can maintain accurate charging information while allowing the session to continue, thus resolving the contradiction between charging accuracy and service continuity.
3Reliability
If the SCSCF bypasses an abnormal AS, then service continuity is improved, but operation and maintenance analysis accuracy deteriorates due to lack of abnormality information
Solution Approach 1:
The substitute CDR acts as an intermediary information carrier that transports abnormality information from the SCSCF to the CDF and subsequently to O&M systems. This intermediary mechanism ensures that critical abnormality information is preserved and transmitted, enabling accurate operation and maintenance analysis while maintaining service continuity through AS bypass.
Solution Approach 2:
The patent implements a feedback mechanism where the SCSCF sends abnormality information about the bypassed AS back to the CDF through the substitute CDR. This feedback loop ensures that O&M systems receive timely and accurate information about AS abnormalities, enabling proper monitoring and analysis while the session continues uninterrupted.
Data Source
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AI summary
A method for processing an abnormality of an Application Server (AS) is disclosed. The method includes that: a Serving Call Session Control Function (SCSCF) sends an Accounting Request (ACR) message to a Charging Data Function (CDF), wherein the ACR message includes information of an abnormal AS; and after receiving the ACR message, the CDF fills a Charging Data Record (CDR) of the SCSCF with the information of the abnormal AS included in the ACR message. Correspondingly, a system for processing an abnormality of an AS is also disclosed. With the disclosure, a corresponding CDR including information of an abnormal AS can be generated in the case that there is an abnormality in the AS, thus enabling the accuracies of charging, operation and maintenance analysis and other associated processing to be improved.