5G Mobile Handover with UPF Reselection
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Solution Overview
Problem
The challenge in 5G networks is to minimize service disruptions during user equipment (UE) mobility, as changes in user plane function (UPF) or application servers can lead to service layer interruptions, affecting user experience. Current methods rely on prediction algorithms with low precision and lack real-time network deployment information, resulting in potential premature or delayed handovers.
Innovation Solution
A mobile handover method where network devices timely report handover events to reselect UPF or application servers, ensuring continuity and reliability by using pre-created network link models and real-time location information to determine optimal server reselection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If prediction algorithms are used to determine handover time and target server, then handover preparation can be initiated, but prediction precision is low and handover timing may be premature or delayed
Solution Approach 1:
The patent implements feedback by having the access and mobility management function device notify the session management function device of the actual handover execution. This feedback loop allows the system to compare predicted handover time with actual handover time, enabling continuous optimization of prediction accuracy and preventing premature or delayed handover preparations.
Solution Approach 2:
The patent performs preliminary action by initiating UPF and application server reselection before the actual handover occurs. The session management function device receives notification of impending handover and proactively prepares the target network functions, ensuring service continuity without waiting for handover completion.
2Loss of information
If third-party location navigation applications are used for prediction, then handover information can be obtained, but prediction precision is not high due to lack of network deployment information
Solution Approach 1:
The patent extracts handover information directly from the network infrastructure itself. The access and mobility management function device, which has direct knowledge of handover events, notifies the session management function device. This eliminates dependence on third-party applications and provides accurate, real-time handover information with high precision.
3Reliability
If UPF and application server reselection is performed timely, then service continuity is improved, but network device coordination complexity increases
Solution Approach 1:
The patent introduces the access and mobility management function device as an intermediary that bridges the gap between the radio access network and the core network functions. This intermediary receives handover notifications from the access network and forwards them to the session management function device, simplifying the coordination complexity while ensuring timely UPF and application server reselection for service continuity.
Data Source
AI summary
The embodiments of the application disclose a mobile handover method. The method includes: a first network device receives first information, and learns that a first terminal device is handed over to a target access network device. The first network device sends second information to a second network device, and the second network device determines, based on the second information, whether to reselect a target user plane function device for the first terminal device; and/or the first network device sends third information to a third network device, and the third network device determines, based on the third information, whether to reselect a target application server for the first terminal device. If the target user plane function device and/or the target application server need/needs to be reselected, a user plane function device and/or an application server need/needs to be handed over in a timely manner.