AMF Policy Updates for Unsupported DNN and NSSAI Changes
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently providing services, particularly in IoT environments, due to unsupported data network names (DNNs) and network slice selection assistance information (NSSAI) issues, leading to service errors and quality degradation.
Innovation Solution
The proposed solution involves a method and apparatus that enables DNN replacement and policy updates in the 5G core network, using the Access and Mobility Management Function (AMF) and Policy Control Function (PCF) to manage and update network policies, ensuring seamless service provision by replacing unsupported DNNs with supported ones, thereby maintaining service quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the system supports multiple DNNs and NSSAIs for diverse service requirements, then service versatility is improved, but system complexity increases making policy management difficult
Solution Approach 1:
The patent segments the policy management function into modular components: DNN validation module, NSSAI validation module, and policy update module. This segmentation allows independent validation and management of each parameter type, reducing the complexity of managing multiple DNNs and NSSAIs simultaneously while maintaining service versatility.
Solution Approach 2:
The patent introduces an intermediary policy control function (PCF) that acts as a mediator between the AMF and the data network. This intermediary validates DNNs and NSSAIs before they are applied, and manages policy updates centrally, thereby reducing the complexity at other system components while supporting diverse service requirements.
2Reliability
If real-time policy updates are implemented to maintain service quality, then service reliability is improved, but signaling overhead and processing time increase
Solution Approach 1:
The patent implements preliminary validation of DNNs and NSSAIs at the time of policy update initiation. The AMF validates these parameters before applying them to the UE, preventing future service failures. This preliminary action ensures service reliability while reducing the need for repeated validation and reconfiguration, thereby optimizing update time.
Solution Approach 2:
The patent establishes a feedback mechanism where the AMF monitors service quality parameters and triggers policy updates only when necessary. This feedback-driven approach maintains service reliability by ensuring updates occur in response to actual conditions, while avoiding unnecessary updates that would increase processing time and signaling overhead.
Data Source
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AI summary
A method performed by an access and mobility management function (AMF) in a wireless communication is provided. The method includes transmitting, to a policy control function (PCF), a policy create request message including first allowed network slice selection assistance information (NSSAI), receiving, from the PCF, a policy create response message including first session management function (SMF) selection management information, , in a case that an establishment of a first protocol data unit (PDU) session is requested from a terminal, establishing the first PDU session based on the first SMF selection management information, in a case that the first NSSAI is changed, transmitting, to the PCF, a policy update request message including second allowed NSSAI based on the policy control request trigger, and receiving, from the PCF, a policy update response message including second SMF selection management information.