Policy Controller Authorization Status Updates in Mobile Networks
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Solution Overview
Problem
In mobile networks, frequent rejections of service authorization requests occur due to changes in user conditions, such as subscription categories or roaming status, leading to inefficient resource management and potential service denial, as the AF lacks real-time updates on authorization status changes.
Innovation Solution
A method where a policy controller performs initial and subsequent authorization checks, sending updates to the node about changes in service authorization status, allowing the node to adjust its operations accordingly without repeated requests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the AF blindly reattempts authorization of the service after rejection, then the AF can potentially access the service again, but frequent rejections occur due to unchanged conditions leading to inefficient resource management
Solution Approach 1:
The PCRF monitors authorization status changes and provides feedback to the AF through notification messages. When authorization status changes (e.g., from rejected to authorized), the PCRF sends a notification to the AF, enabling the AF to adjust its behavior without blind reattempts, thus improving both reliability and authorization efficiency
2Productivity
If the AF does not reattempt authorization of the service after rejection, then resource management becomes efficient, but otherwise allowed usage of the service could be prohibited
Solution Approach 1:
The PCRF actively monitors changes in authorization status and notifies the AF when status changes occur. This feedback mechanism allows the AF to know when authorization is restored without needing to blindly reattempt, maintaining efficiency while ensuring reliable service access when conditions permit
3Measurement precision
If the PCRF performs frequent authorization checks, then the authorization status is accurately determined, but network resources are consumed unnecessarily
Solution Approach 1:
Instead of continuous or frequent authorization checks, the PCRF performs checks periodically or triggered by specific events (e.g., subscription changes, quota updates). The system maintains accuracy by checking at relevant moments while reducing resource consumption by avoiding unnecessary frequent checks through event-driven architecture
Data Source
AI summary
A policy controller of a mobile network receives an authorization request for a packet-based service from a node. In response to receiving the authorization request, the policy controller performs an authorization check to determine an authorization status of the service and sends an authorization response to the node. The authorization response indicates the authorization status of the service. In response to the same authorization request, the policy controller performs at least one further authorization check to redetermine the authorization status of the service. If the further authorization check indicates that the authorization status of the service has changed, the policy controller sends a status change message to the node. The status change message indicates to the node that the authorization status of the service has changed.