5G Multicast-Unicast Bearer Switching During Inter-Cell Handovers
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Solution Overview
Problem
The challenge of switching between multicast and unicast bearers in 5G networks during inter-cell handovers due to user mobility is not adequately addressed by existing technologies.
Innovation Solution
A method for mode switching involving network functions that include invoking a mode switch operation with a command to notify target parties to switch between multicast and unicast modes, utilizing network elements like MBSF, MB-SMF, and AMF to manage user terminals and radio access network nodes for efficient bearer switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a user moves from a multicast-covered cell to a non-multicast cell during inter-cell handover, then the user can maintain mobility and access different cells, but the user must switch between multicast and unicast bearers which complicates the service delivery mechanism
Solution Approach 1:
The network side (core network) acts as an intermediary that proactively manages the mode switching between multicast and unicast bearers. The network function determines when switching is needed and sends mode switch commands to user terminals, eliminating the need for complex terminal-side decisions and simplifying the overall switching mechanism while maintaining user mobility across cells with different multicast coverage
2Reliability
If the network proactively manages mode switching between multicast and unicast bearers, then service delivery reliability is improved, but network function complexity increases
Solution Approach 1:
The network function is segmented into specialized components: a mode switch operation invocation unit that triggers switching decisions, and a separate command transmission unit that delivers instructions to user terminals. This segmentation allows the system to achieve reliable service delivery through coordinated network-side management while keeping individual functional modules relatively simple and maintainable
Data Source
AI summary
Embodiments of the present invention provide a method for mode switching and a device. The method includes: invoking a mode switch operation towards a second network function, where a parameter of the mode switch operation includes first information, and the first information includes a mode switch command; and the mode switch command is used to notify a target party to perform a mode switch operation.