AMF Access Mobility Policy Control via UDM Charging Data
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Solution Overview
Problem
In 5G network environments, existing systems face challenges in efficiently determining whether to establish an access and mobility policy association for user equipment (UE) devices based on subscription and charging-related information, leading to potential signaling overhead and latency in data session establishment.
Innovation Solution
Implementing a unified data management (UDM) element and/or unified data repository (UDR) to store subscription-related information and a charging function (CHF) to provide information to the Access and Mobility Management Function (AMF), allowing for informed decisions on establishing an AM policy association for UE devices during registration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If AM policy association is established for all UE devices during registration, then access and mobility control coverage is improved, but signaling overhead and latency increase
Solution Approach 1:
The system performs preliminary evaluation of subscription information and charging-related data during the UE registration process to determine in advance whether an AM policy association should be established. This preliminary action filters out unnecessary policy associations before they are created, reducing signaling overhead and latency while ensuring that only necessary associations are established.
Solution Approach 2:
The system applies different treatment to different UE devices based on their specific subscription information and charging characteristics. Instead of uniformly establishing AM policy associations for all devices, the system evaluates local qualities (subscription details, charging plans) of each UE and establishes policy associations only when necessary, optimizing the balance between control coverage and signaling efficiency.
2Loss of time
If AM policy association is established only when necessary based on UE information, then signaling overhead is reduced, but decision-making complexity increases
Solution Approach 1:
The system introduces intermediary evaluation mechanisms that automatically assess subscription information and charging-related data to determine whether an AM policy association is necessary. This intermediary layer simplifies the decision-making process by providing structured evaluation criteria and automated filtering, reducing the complexity burden on the AMF while still achieving selective policy association establishment.
3Loss of information
If subscription information is stored in UDM/UDR and charging information in CHF, then information management is improved, but system complexity increases
Solution Approach 1:
The system segments information management by storing subscription-related information in the UDM/UDR and charging-related information in the CHF, with clear functional separation. This segmentation improves information organization and retrieval efficiency while managing complexity through well-defined interfaces and protocols between the AMF, UDM/UDR, and CHF components.
Data Source
AI summary
A method may include receiving, by an access and mobility management function (AMF), a registration request from a user equipment (UE) device, and obtaining, by the AMF, at least one of subscriber-related information associated with the UE device or information associated with the UE device from a charging function (CHF). The method may also include determining, by the AMF and based on the obtained information, whether to establish an access and mobility (AM) policy association for the UE device. The method may further include initiating, in response to determining that the AM policy association for the UE device is to be established, the AM policy association for the UE device.