5G • RAN
Master Node (MN)
Dual Connectivity Master Node
The radio access node in Dual Connectivity maintaining control plane connection to the core network (AMF or MME).
Technical Explanation
In MR-DC, the Master Node controls the overall UE state. In EN-DC (Option 3x), the MN is an LTE eNodeB connected to the EPC; in NE-DC (Option 4), the MN is a 5G gNodeB connected to 5GC; in NGEN-DC (Option 7), the MN is an ng-eNodeB connected to 5GC. The MN coordinates addition, modification, and release of the Secondary Node.
Key Functions
- Maintains primary control plane connection with the mobile core network
- Coordinates addition, modification, and release of Secondary Node
- Hosts Master Cell Group (MCG) and anchors user security context
Specifications
3GPP TS 38.300
Interfaces
XnN2S1-MME
Related 5G Concepts
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