5G Cell Handover with CAG Connection Management
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Solution Overview
Problem
In 5G networks with a separated centralized and distributed network element architecture, base stations cannot perform Closed Access Group (CAG) connection management during user cell handover, leading to ineffective user handover processes.
Innovation Solution
A method and device for cell handover that involves receiving a trigger message from a user equipment (UE) and sending a UE context setup request to a target distributed network element, allowing the UE to be handed over to a target cell corresponding to the target distributed network element, thereby enabling CAG connection management during the handover process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a base station uses separated centralized and distributed network element architecture, then flexible networking and multipoint coordination are improved, but CAG connection management capability during cell handover is lost
Solution Approach 1:
The patent extracts the CAG connection management function from the distributed network element and places it in the centralized network element. This allows the distributed element to focus on radio access functions while the centralized element handles access control management, resolving the contradiction by separating functions appropriately across the architecture.
Solution Approach 2:
The patent introduces an intermediary mechanism where the centralized network element acts as a mediator between the distributed network element and the core network for CAG management. The centralized element receives handover requests, manages CAG membership verification, and coordinates with the core network, enabling CAG management capability to be maintained during handover in the separated architecture.
2Reliability
If CAG membership verification is performed during cell handover, then access control security is improved, but handover process complexity increases
Solution Approach 1:
The patent performs CAG membership verification as a preliminary action during the handover preparation phase rather than as a separate post-handover step. The centralized network element verifies CAG membership before finalizing the handover, ensuring security is maintained while integrating the verification into the existing handover workflow to minimize additional complexity.
Data Source
AI summary
A cell handover method, a cell handover device, a user processing method and a user processing device are disclosed. The cell handover method includes receiving a trigger message sent by a User Equipment (UE), and sending a UE context setup request, which is configured to instruct a target distributed network element to set up a UE context, to the target distributed network element in response to the trigger message.