Network Slice Admission Control for Continuity During NSACF Changes
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Solution Overview
Problem
The challenge in wireless communication systems supporting multiple network slice admission control functions (NSACFs) is the efficient management of network slice quotas and ensuring service continuity when NSACFs change due to UE location updates.
Innovation Solution
A method and device for monitoring and controlling the number of user equipments (UEs) registered per network slice, involving a network slice admission control function (NSACF) that receives and identifies NSAC-related request messages, and an access and mobility management function (AMF) that determines and transmits indications based on previously allowed network slices, ensuring seamless transitions and load distribution across multiple NSACFs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple NSACFs are deployed to manage network slice quotas, then network slice admission control capability is improved, but system complexity increases due to NSACF changes during UE location updates
Solution Approach 1:
The AMF determines and includes an indication of a previously allowed network slice in the NSAC request message before sending it to the NSACF. This preliminary action allows the NSACF to proactively identify and accept UEs that were previously allowed, preventing service disruption before it occurs during NSACF changes.
Solution Approach 2:
The indication message acts as an intermediary carrier that conveys information about previously allowed network slices from the AMF to the NSACF. This intermediary mechanism enables seamless transition during NSACF changes by providing the NSACF with context about UEs that should be accepted, reducing system complexity during handover.
2Productivity
If NSACF changes occur during UE location updates, then load distribution is improved, but service continuity may be disrupted
Solution Approach 1:
The system performs preliminary identification of previously allowed network slices and includes this information in the NSAC request message before the actual NSACF change takes effect. This ensures that when load distribution requires NSACF changes, service continuity is maintained through proactive acceptance of previously allowed UEs.
Solution Approach 2:
The NSACF uses the indication message as feedback information to determine whether to accept or reject UE registration requests. By feeding back information about previously allowed network slices, the NSACF can maintain service continuity even when changing NSACFs for load distribution purposes.
3Reliability
If NSACF accepts all UE registration requests, then service continuity is improved, but network slice quota management efficiency decreases
Solution Approach 1:
The NSACF applies different acceptance criteria based on local conditions - specifically, whether the UE was previously allowed in a network slice. For UEs with previous approval indicated in the message, the NSACF accepts them regardless of current quota status to maintain service continuity. For other cases, normal quota management applies, optimizing efficiency.
Solution Approach 2:
The system changes the acceptance parameter dynamically based on the indication message content. When the indication of previously allowed network slice is present, the acceptance threshold is relaxed to ensure continuity. When the indication is absent, normal quota-based acceptance rules apply, maintaining management efficiency.
Data Source
AI summary
The present disclosure relates to a method and device for communication in a wireless communication system supporting multiple network slice admission control functions (NSACFs). The method performed by a NSACF that monitors and controls the number of registered UEs for each network slice in a wireless communication system supporting multiple NSACFs according to an embodiment of the present disclosure comprises the steps of: receiving an NSAC-related request message from an AMF that manages the mobility of a UE; identifying whether the received NSAC-related request message includes an indication based on a network slice previously granted to the UE; and in case that the received NSAC-related request message includes the indication, accepting the request message.