5G • RAN
Split Bearer
Dual Connectivity Split Radio Bearer
Radio bearer whose PDCP layer routes traffic concurrently across both Master Cell Group and Secondary Cell Group.
Technical Explanation
In a Split Bearer, a single PDCP entity (hosted either at the Master Node or Secondary Node) splits outgoing packet streams across two independent lower-layer RLC/MAC protocol stacks on the MCG and SCG radio legs. The receiving PDCP entity recombines the streams in-order, pooling total bandwidth across two distinct base stations.
Key Functions
- Splits single data stream across two independent radio access nodes
- Combines throughput of 4G eNodeB and 5G gNodeB (or two 5G nodes)
- Managed by centralized PDCP entity executing packet reordering and duplication
Specifications
3GPP TS 38.300, TS 38.331
Interfaces
UuXn
Related 5G Concepts
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