AMF Tracking Area Assignment for UPF Alignment
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently aligning the serving area of a serving UPF with the tracking area assigned to a UE, particularly in supporting SSC mode 2, due to misalignment between pre-assigned and serving areas, which affects data traffic management and resource allocation.
Innovation Solution
A method is introduced where the AMF receives SSC mode indication information and serving area information from the SMF to determine if a new tracking area assignment is necessary, comparing the pre-assigned tracking area with the serving area, and performs updates if misalignment is detected, considering priority information for PDU sessions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the tracking area is pre-assigned to UE without considering serving UPF area, then the tracking area assignment is simple and fast, but the alignment between tracking area and serving area deteriorates, causing inefficient data traffic management
Solution Approach 1:
The AMF proactively determines whether tracking area update is necessary by comparing pre-assigned tracking area with serving UPF area before actual data transmission occurs. This preliminary check prevents misalignment issues from arising in the first place, resolving the contradiction between assignment speed and alignment accuracy.
Solution Approach 2:
The system implements a feedback mechanism where the AMF continuously monitors the alignment between tracking area and serving UPF area, and triggers tracking area updates when misalignment is detected. This closed-loop control ensures ongoing alignment precision without sacrificing assignment efficiency.
2Manufacturing precision
If the AMF continuously monitors and updates tracking area to ensure alignment, then the tracking area alignment precision is improved, but the signaling overhead and system complexity increase
Solution Approach 1:
The AMF performs partial monitoring by only checking tracking area alignment when specific events occur (PDU session establishment, SSC mode indication reception). This selective monitoring approach maintains alignment precision without requiring continuous full-system monitoring, thus avoiding excessive complexity.
Solution Approach 2:
The system applies different processing levels to different scenarios: simple comparison for basic alignment checks, and more sophisticated evaluation when SSC mode 2 is involved. This localized quality adjustment optimizes the balance between precision and complexity for each specific case.
3Manufacturing precision
If tracking area update is performed frequently to maintain alignment, then the alignment accuracy is improved, but the loss of time and signaling overhead increase
Solution Approach 1:
The system performs tracking area alignment checks periodically at key events (PDU session establishment, SSC mode changes) rather than continuously. This periodic action maintains alignment accuracy while minimizing unnecessary updates and associated time losses.
Solution Approach 2:
The AMF performs alignment verification in advance during session setup and SSC mode configuration, preventing misalignment before it affects data transmission. This preliminary action eliminates the need for frequent corrective updates, reducing time loss.
Data Source
AI summary
Provided is a tracking area assignment method by an access and mobility management function (AMF) in a wireless communication system. The method may include receiving, from a session management function (SMF), service and session continuity (SSC) mode indication information for a protocol data unit (PDU) session generated for a user equipment (UE), obtaining serving area information for a serving area of a serving user plane function (UPF) associated with the PDU session, determining the assignment of a new tracking area to the UE is necessary based on a tracking area pre-assigned to the UE and the serving area, and performing tracking area update for the assignment of the new tracking area to the UE if it is determined that the assignment of the new tracking area is necessary.