5G UE Mobility Management via AMF Mediation
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Solution Overview
Problem
In 5G mobile communication systems, managing user equipment (UE) mobility and registration when using both satellite and cellular networks is challenging due to varying satellite coverage and restrictions on satellite RAN usage, especially in scenarios where both satellite and general RANs are part of the same public land mobile network, leading to issues with UE state transitions and mobility management.
Innovation Solution
A method where the user equipment (UE) communicates with an access and mobility management function (AMF) and session management function (SMF) to manage registration, state transitions, and mobility, using protocol data unit (PDU) session establishment requests and configuration updates to ensure seamless mobility management, even when satellite RAN usage is restricted or not available.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If satellite RAN is used to extend coverage, then service coverage area is improved, but network complexity and mobility management difficulty increase
Solution Approach 1:
The patent introduces an intermediary mechanism where the AMF acts as a mediator between the UE and satellite RAN, managing registration and mobility centrally. The network uses indirect access through terrestrial base stations as intermediaries to communicate with satellites, reducing the complexity of direct UE-satellite management while extending coverage.
2Reliability
If satellite RAN usage is restricted for certain UEs, then network performance is improved, but service availability deteriorates
Solution Approach 1:
The patent implements dynamic service availability where satellite RAN access is not statically restricted but dynamically controlled based on UE state, network conditions, and service requirements. The AMF can flexibly allow or restrict satellite access per UE per situation, maintaining network performance while adapting service availability to different scenarios.
Solution Approach 2:
The system changes the parameter of satellite RAN accessibility from a fixed restriction to a variable state controlled by the network. By modifying access parameters dynamically based on UE registration status, service type, and network load, the system maintains performance reliability while ensuring service availability when needed.
3Duration of action of stationary object
If UE mobility between satellite and cellular networks is supported, then service continuity is improved, but state transition management complexity increases
Solution Approach 1:
The patent segments mobility management into distinct phases: terrestrial network registration, satellite RAN registration, and handover coordination. By dividing the complex state transition process into manageable segments handled by different network functions (AMF, SMF, UPF), the system achieves service continuity while reducing management complexity through modular architecture.
Solution Approach 2:
The system maintains continuous service action during network transitions by implementing seamless handover mechanisms. The AMF ensures continuous registration management while the UPF maintains data flow continuity, allowing UE to move between satellite and cellular networks without service interruption, thus achieving continuous useful action despite state changes.
Data Source
AI summary
Provided is a 5th generation (5G) or 6th generation (6G) communication system for supporting a higher data rate. A method performed by a user equipment may include transmitting a registration request message to an access and mobility management function (AMF), receiving a registration accept message from the AMF, transmitting a protocol data unit (PDU) session establishment request message to a session management function (SMF), receiving a PDU session establishment accept message from the SMF, and receiving a configuration update message from the AMF.