PDU Session Handover Admission Control in 5G Wireless Networks
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Solution Overview
Problem
Prior art fails to accurately manage PDU session counts across different access types during handovers in wireless communication networks, leading to unintended consequences due to lack of interaction with the Network Slice Admission Control Function (NSACF).
Innovation Solution
Implement a method where the NF service consumer, such as the Session Management Function (SMF) or combined SMF and Packet Data Network Gateway (PGW-C), determines PDU session handovers between access types and interacts with the NSACF to update counts, ensuring accurate network slice admission control by increasing counts for the target access and decreasing counts for the source access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the NF service consumer does not interact with the NSACF entity during PDU session handover, then the handover process is simple and fast, but the PDU session count management becomes inaccurate leading to unintended consequences
Solution Approach 1:
The patent applies preliminary action by having the NF service consumer proactively interact with the NSACF entity during PDU session handover before the handover is complete. The consumer sends a handover notification message to the NSACF entity, which预先 updates the PDU session count for the target access type, ensuring accurate count management is established in advance rather than waiting for post-handover reporting.
2Measurement precision
If the NF service consumer interacts with the NSACF entity during every PDU session handover, then the PDU session count accuracy is maintained, but the signaling overhead and processing complexity increase
Solution Approach 1:
The patent applies local quality by making the NSACF interaction selective rather than universal. The NF service consumer determines whether interaction is necessary based on the specific handover scenario - specifically when handover occurs between different access types (3GPP to non-3GPP or vice versa). This localized approach updates counts only where access type changes occur, maintaining accuracy while avoiding unnecessary signaling in other handover cases.
3Reliability
If the NF service consumer updates PDU session counts for both source and target access types, then the admission control accuracy is improved, but the number of NSACF interactions increases
Solution Approach 1:
The patent applies feedback by having the NSACF entity return acknowledgment information to the NF service consumer after updating the PDU session counts. The consumer receives feedback confirming whether the count updates were successful, and based on this feedback, it can determine whether to proceed with the handover or take corrective actions. This feedback mechanism ensures reliability while allowing the system to adapt to the actual update results.
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. Embodiments herein disclose methods for handling a network slice admission control (NSAC) performed by a Network Function (NF) service consumer (200) in a wireless network (1000). The method includes determining that an existing Protocol Data Unit (PDU) session has been handed over from a source access to a target access. Further, the method includes performing a network slice admission control for the PDU session, based on the determination, by interacting the NF service consumer with a Network Slice Admission Control Function (NSACF) entity (300).