5G Network Slice Access Control with AMF Back-Off Timers
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Solution Overview
Problem
There is a need for more efficient network slice access control in wireless communication systems to reduce signaling overhead during network slice access control.
Innovation Solution
A method and device for network slice access control in a wireless communication system, involving an access and mobility management function (AMF) that receives a PDU session establishment request, transmits a generation request, receives a response indicating failure, and sends a reject message with a back-off timer to manage network slice access efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If network slice access control is performed through traditional signaling methods, then network slice access can be managed, but signaling overhead increases
Solution Approach 1:
The patent extracts the access control decision logic from the traditional signaling path between AMF and UE. Instead of requiring multiple signaling exchanges, the AMF determines network slice accessibility locally and directly applies the back-off timer mechanism, removing unnecessary signaling steps while maintaining access control functionality
Solution Approach 2:
The patent segments the network slice access control process into distinct components: accessibility determination, back-off timer calculation, and rejection message generation. This segmentation allows the AMF to handle each component independently and efficiently, reducing the need for iterative signaling between network entities
2Ease of operation
If network slice access control is performed without back-off timer management, then access requests can be processed freely, but network congestion increases
Solution Approach 1:
The patent applies preliminary anti-action by implementing the back-off timer mechanism before allowing new access requests. When the AMF determines that a network slice is inaccessible or overloaded, it proactively applies the back-off timer to prevent further access attempts during the timer period, thereby preventing network congestion before it occurs
Solution Approach 2:
The back-off timer value is dynamically adjusted based on network conditions and slice accessibility status. The AMF can modify the timer duration according to current load, slice priority, and historical access patterns, enabling flexible control that adapts to changing network conditions while maintaining efficient resource utilization
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. The present disclosure provides a method performed by a network function (NF) for network slice access control in a wireless communication system. The method includes transmitting, to a network slice admission control function (NSACF), an event exposure subscribe message including information about a status of single network slice selection assistance information (S-NSSAI), receiving, from the NSACF, an event exposure subscribe response message indicating the result about subscription, receiving, from the NSACF, an event exposure notify message including information about event information.