5G Network Slice Access Control for Authentication Failure Feedback
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Solution Overview
Problem
In 5G communications, terminal devices frequently attempt to access network slices that fail authentication, leading to signaling waste and network congestion due to failed PDU session establishment.
Innovation Solution
The access and mobility management function network element receives information about authentication failures and sends rejection messages to the terminal device, deleting specific network slice selection assistance information or requesting deregistration to prevent further access attempts to failed network slices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device continues to attempt PDU session establishment in a network slice whose authentication fails, then the terminal device maintains access persistence, but network congestion and signaling waste increase
Solution Approach 1:
The network side (AMF) provides feedback to the terminal device by sending rejection messages when authentication fails. This feedback mechanism informs the terminal device to stop attempting access to the failed network slice, thereby reducing unnecessary signaling and network congestion while maintaining access persistence for valid slices.
Solution Approach 2:
The system takes preliminary anti-action by proactively rejecting access attempts to network slices with authentication failures before they can cause further signaling waste and network congestion. The AMF identifies failed slices and sends rejection messages to prevent continued unsuccessful access attempts.
2Adaptability or versatility
If the terminal device frequently accesses the network slice whose authentication fails, then the terminal device ensures comprehensive coverage, but signaling overhead and network congestion increase
Solution Approach 1:
The AMF sends feedback messages to the terminal device indicating which network slices have authentication failures. This allows the terminal device to adapt its access behavior by avoiding failed slices while maintaining coverage for successful slices, thereby reducing signaling overhead without compromising comprehensive coverage.
Solution Approach 2:
The network slice selection assistance information (NSSAI) is segmented into allowed and disallowed slices. The terminal device receives updated NSSAI information that excludes failed slices, enabling it to maintain comprehensive coverage for valid slices while avoiding signaling overhead associated with failed slice attempts.
3Ease of operation
If the terminal device attempts PDU session establishment in failed network slices, then the terminal device maintains access availability, but network resource utilization deteriorates
Solution Approach 1:
The system performs preliminary anti-action by identifying and rejecting access attempts to network slices with authentication failures before they can consume network resources. The AMF sends rejection messages to the terminal device, preventing further resource-wasting attempts while maintaining access availability for successful slices.
Solution Approach 2:
The network provides feedback to the terminal device about authentication failures, enabling the terminal to adjust its access behavior. This feedback mechanism ensures access availability for valid slices while preventing network resource deterioration caused by repeated failed attempts.
Data Source
AI summary
This application provides a network slice access control method, including: determining, by an access and mobility management function network element, first allowed network slice selection assistance information of a terminal device in a registration process to register the terminal device to a network; learning, by the access and mobility management function network element, of an authentication failure of a first network slice corresponding to first single network slice selection assistance information from the first allowed network slice selection assistance information.