AMF Selection via NSSAI Priority in 5G Core
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Solution Overview
Problem
Next-generation mobile communication systems face challenges in efficiently selecting and configuring network nodes to support the specific slice/services requested by user equipment (UE) in a next-generation core network, particularly due to increased data traffic, higher transmission rates, and the need for low latency and high energy efficiency.
Innovation Solution
The solution involves criteria for selecting an Access and Mobility Function (AMF) based on priority information of Network Slice Selection Assistance Information (NSSAI), ensuring that the network node preferentially selects the required AMF to meet the UE's needs effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If network nodes select AMF without priority-based criteria, then selection process is simple, but service delivery efficiency deteriorates due to increased traffic and latency requirements
Solution Approach 1:
The patent introduces priority values as a new parameter associated with each S-NSSAI, transforming the AMF selection process from random or load-based to priority-driven. The network node selects AMF by evaluating the priority parameter of requested slices, ensuring high-priority services receive preferential treatment, thus improving service delivery efficiency without significantly increasing system complexity
Solution Approach 2:
The patent pre-configures priority information for different S-NSSAI combinations in the network node before actual service requests occur. This preliminary setup of priority mappings allows the network node to quickly determine the appropriate AMF based on pre-established criteria, avoiding complex real-time decision-making while maintaining high service delivery efficiency
2Reliability
If network nodes configure AMF based on priority information of NSSAI, then service requirements are met more accurately, but configuration complexity increases
Solution Approach 1:
The patent enhances the existing NSSAI configuration by adding a priority parameter to each S-NSSAI entry. This simple parameter extension allows the network node to differentiate between various slice requirements and select appropriate AMFs based on priority levels, significantly improving service requirement fulfillment while adding minimal configuration complexity
Solution Approach 2:
The network node automatically uses the priority information embedded in the NSSAI configuration to make AMF selection decisions without requiring manual intervention or complex external control mechanisms. The system self-configures the AMF selection process based on the priority parameters already present in the slice definitions, improving reliability while keeping configuration management simple
3Use of energy by moving object
If network nodes use traditional AMF selection methods, then system operation is straightforward, but energy efficiency deteriorates due to increased data traffic handling
Solution Approach 1:
The patent introduces priority as a selection parameter that enables the network node to direct traffic to appropriate AMFs based on service requirements. By routing high-priority traffic to suitable AMFs, the system optimizes energy utilization across the network, preventing overload of specific nodes and improving overall energy efficiency while maintaining straightforward operational procedures
Data Source
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AI summary
A method for selecting a serving AMF of a network node in a wireless communication system includes receiving a registration request message of a user equipment (UE), the registration request message including a network slice selection assistance information (NSSAI) for a slice requested by the UE and priority information of the NSSAI; determining whether the NSSAI is valid for the UE; when the NSSAI is valid for the UE, searching a first AMF which is able to support the NSSAI based on the priority information; and when the first AMF is searched, selecting the first AMF as the serving AMF serving the UE and transmitting the registration request message to the first AMF.