AMF Network Slice Re-Mapping for Seamless PDU Session Continuity
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Solution Overview
Problem
Existing wireless communication systems face challenges in maintaining service continuity when an existing network slice becomes unavailable due to network congestion, necessitating a method for seamless network slice re-mapping.
Innovation Solution
The method involves an Access Management Function (AMF) that performs network slice re-mapping by receiving and transmitting PDU session establishment requests and responses, including timer information and slice re-mapping details, to maintain service continuity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If network slice re-mapping is performed to maintain service continuity during congestion, then service reliability is improved, but device complexity increases due to additional re-mapping procedures
Solution Approach 1:
The AMF performs network slice re-mapping in advance before the actual service disruption occurs. When congestion is detected or predicted, the system pre-establishes alternative network slices and configurations, so that when the primary slice fails, the switch can happen seamlessly without complex real-time decision-making procedures.
Solution Approach 2:
The AMF (Access Management Function) acts as an intermediary that coordinates the entire re-mapping process between the terminal and the network core. It receives re-mapping instructions from the network, processes them locally, and applies the new network slice configuration, thereby simplifying the overall system architecture by centralizing the complexity in a single manageable function.
2Reliability
If network slice re-mapping is implemented to ensure service continuity, then service reliability is improved, but loss of time increases due to additional re-mapping operations
Solution Approach 1:
The system performs network slice re-mapping preparations in advance, including pre-configuring alternative slices and pre-establishing necessary connections. This preliminary action eliminates the need for complex real-time calculations and decisions during actual service disruption, significantly reducing the re-mapping operation time when needed.
Solution Approach 2:
The AMF implements a feedback mechanism where it monitors network conditions continuously and receives re-mapping instructions based on actual network state. This feedback loop allows the system to make informed, rapid re-mapping decisions without unnecessary delays, as the AMF already has contextual information about network status and terminal capabilities.
3Ease of operation
If timer information is provided with slice re-mapping information, then ease of operation is improved for terminal devices, but device complexity increases at the network side
Solution Approach 1:
The AMF extracts and isolates the timer information as a separate, dedicated parameter within the re-mapping response message. By taking out the timing control functionality and making it explicit, the terminal device can independently manage the re-mapping process without needing to interpret complex network-side logic, thereby simplifying terminal operations while the network side handles the complexity of timer management centrally.
Data Source
AI summary
An access management function (AMF) operation method in a wireless communication system, may comprise receiving a first protocol data unit (PDU) session establishment request based on a first network slice from a terminal, performing network slice re-mapping related to a PDU session, transmitting a first PDU session establishment response to the terminal based on the first PDU session establishment request, the first PDU session establishment response including second network slice related information based on the network slice re-mapping, receiving a second PDU session establishment request from the terminal based on the first network slice or the second network slice, and transmitting a second PDU session establishment response to the terminal based on the second PDU session establishment request.