MBS Data Synchronization Across Shared 5G NR gNB-DU Interfaces
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Solution Overview
Problem
Conventional systems are unable to realize synchronous transmission of Multicast/Broadcast Service (MBS) data across gNB or cells in a gNB-DU cell group in a 5G NR system due to the inability to share interfaces with unicast services.
Innovation Solution
The solution involves transmitting synchronization information through a GTP-U extension header on N3/Xn-U/F1-U interfaces, defining specific PDU formats, and using a SYNC protocol layer to ensure synchronized data transmission across gNB-DU cells in a 5G NR system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If interfaces are shared with unicast services, then resource utilization is improved, but synchronous transmission of MBS data across gNB-DU cells cannot be realized
Solution Approach 1:
The patent segments the interface functionality by introducing separate logical channels: a control plane channel for transmitting synchronization information and a user plane channel for MBS data transmission. This segmentation allows the physical interface to be shared while maintaining independent synchronization control, resolving the contradiction between interface sharing and synchronous transmission capability.
Solution Approach 2:
The patent introduces an intermediary synchronization information element that mediates between the shared interface and the synchronous transmission requirement. This intermediary carries timing and synchronization data, enabling coordinated transmission across cells that share the same physical interface, thus maintaining both interface sharing and transmission synchronization.
2Device complexity
If synchronization information is transmitted through existing protocols, then implementation complexity is reduced, but resynchronization capabilities are insufficient
Solution Approach 1:
The patent incorporates synchronization information elements in advance within the existing GTP-U protocol structure, preparing the framework for future resynchronization needs. By embedding synchronization capabilities preliminarily in the protocol design, the system maintains low implementation complexity while enabling robust resynchronization when needed.
Solution Approach 2:
The patent enhances existing protocol parameters by adding synchronization-specific information elements to the GTP-U header and data packets. These parameter extensions allow the protocol to maintain its original simplicity while gaining advanced resynchronization capabilities through enriched data structures.
Data Source
AI summary
A system and method for multicast/broadcast service data synchronization. In some embodiments, the method includes transmitting, by a first network node, synchronization information to a second network node. In some embodiments, the synchronization information indicating a plurality of information elements configured to transmit Multicast/Broadcast Service (MBS) data on a user plane over an interface.