5G Multicast Bearer Switching for Seamless MBS Handover
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Solution Overview
Problem
Next-generation mobile communication systems face challenges in supporting multicast and broadcast services (MBS) through multicast or unicast bearers, particularly in maintaining service continuity during mode transitions and handovers, and require efficient data processing methods across different layers of the protocol stack.
Innovation Solution
A method for a UE to monitor a physical downlink control channel (PDCCH) for MBS identifiers, receive messages indicating activation or deactivation, and adjust bearer configurations accordingly, along with a base station transmitting MBS service changes using MBS identifiers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multicast bearer structure is used for MBS service, then service efficiency is improved, but device complexity increases due to need for separate bearer management
Solution Approach 1:
The patent combines multicast and unicast bearer management by allowing the same bearer to serve both purposes. The base station can dynamically switch between multicast and unicast transmission modes using the same bearer resources, reducing the need for separate bearer management structures while maintaining service efficiency.
Solution Approach 2:
The bearer structure is designed to be multi-functional, capable of operating in both multicast and unicast modes. This universal bearer design allows the system to adapt to different service requirements without increasing device complexity, as the same bearer infrastructure handles both transmission types.
2Device complexity
If unicast bearer structure is used for MBS service, then device complexity is reduced, but service efficiency deteriorates due to increased signaling overhead
Solution Approach 1:
The patent implements dynamic bearer mode switching, where the system can transition between unicast and multicast modes based on service requirements and network conditions. This dynamic approach allows the simplified unicast bearer structure to achieve multicast service efficiency when needed, without permanently increasing device complexity.
Solution Approach 2:
The system changes operational parameters of the bearer, specifically switching between multicast and unicast transmission modes. By modifying the transmission mode parameter rather than the bearer structure itself, the system maintains low device complexity while achieving high service efficiency when multicast is required.
3Adaptability or versatility
If bearer switching between multicast and unicast is implemented, then adaptability is improved, but reliability decreases due to potential service interruption during switching
Solution Approach 1:
The patent performs preliminary bearer setup and configuration before actual service transmission begins. The bearer is established in advance with the capability to operate in both multicast and unicast modes, so that when switching is needed, the transition can occur without service interruption because the bearer infrastructure is already in place and configured.
Solution Approach 2:
The system maintains continuous service transmission during bearer mode switching by ensuring that the bearer remains active and configured for both multicast and unicast operations. This continuity approach allows seamless switching between modes without interrupting the useful action of data transmission, thereby maintaining reliability while achieving adaptability.
Data Source
AI summary
The present disclosure relates to: a communication technique merging IoT technology with a 5G communication system for supporting a data transmission rate higher than a 4G system; and a system therefor. The present disclosure can be applied to intelligent services (for example, smart homes, smart buildings, smart cities, smart cars or connected cars, healthcare, digital education, retail, security- and safety-related services, and the like) on the basis of a 5G communication technology and IoT-related technology. Disclosed in the present invention is a method for structuring or setting a multicast bearer or unicast bearer supporting an MBS service so as to support the MBS service in a next-generation mobile communication system, and a method for processing data of a PHY layer device, MAC layer device, RLC layer device or PDCP layer device receiving and processing MBS data.