AMF Network Slice Admission Control for Seamless PDU Sessions
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Solution Overview
Problem
Existing 5G mobile communication systems face challenges in managing network slices efficiently, particularly in handling terminal registration and PDU session establishment procedures, especially when requested slices are unavailable or exceed network capacity, leading to suboptimal resource allocation and service disruptions.
Innovation Solution
The proposed method involves an access and mobility management function (AMF) that determines whether a requested network slice is allowed for a terminal, checks for network slice admission control (NSAC), and manages event notifications and subscriptions to handle slice availability changes during terminal registration and PDU session establishment, ensuring optimal resource allocation and seamless service continuity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If network slice admission control is implemented to manage slice availability, then resource allocation is optimized, but service continuity is disrupted when slices become unavailable
Solution Approach 1:
The system performs preliminary actions by determining in advance whether a requested network slice is exempt from NSAC before completing the PDU session establishment. The AMF checks NSAC status and determines exemption status proactively, allowing the system to prepare appropriate responses and maintain service continuity without waiting for slice availability changes during operation.
Solution Approach 2:
The system implements feedback mechanisms where the AMF determines NSAC exemption status based on feedback information about slice availability and network conditions. This feedback loop allows dynamic adjustment of admission control policies to balance resource optimization with service continuity.
2Productivity
If strict network slice admission control is applied to all requested slices, then resource utilization is optimized, but terminal registration and session establishment are blocked
Solution Approach 1:
The system applies different quality levels of admission control to different network slices. By determining whether each requested slice is exempt from NSAC, the system allows certain slices to proceed without strict admission control while maintaining resource optimization for slices that require control. This localized differentiation enables smooth terminal registration while preserving resource utilization benefits.
Solution Approach 2:
The admission control policy is made dynamic by determining NSAC exemption status based on current network conditions and slice characteristics. The system can adjust which slices are subject to admission control in real-time, making the process flexible rather than rigid, thus maintaining ease of operation while optimizing resources.
3Reliability
If network slice availability is continuously monitored and enforced, then service reliability is improved, but system complexity increases
Solution Approach 1:
The system extracts the NSAC determination function from the general admission control process. By separately determining whether a slice is exempt from NSAC before the main PDU session establishment procedure, the system simplifies the overall flow while maintaining reliability. This extraction reduces the complexity burden on the AMF and other network elements.
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. Provided are an access and mobility management function (AMF) and a method performed by an AMF, including receiving, from a terminal, a registration request message for a protocol data unit (PDU) session including information on a requested slice associated with the PDU session; determining whether the requested slice is allowed and whether the requested slice is for a network slice admission control (NSAC); if the requested slice is allowed for the terminal and is for the NSAC, determining whether the requested slice is exempt from the NSAC for the PDU session; and if the requested slice is exempt from the NSAC for the PDU session, transmitting, to the terminal, a registration accept message as a response to the registration request message.