Section: 4.3.1.1 Common MR-DC principles
Content: In MR-DC, there is an interface between the MN and the SN for control plane signalling and coordination. For each MR-DC UE, there is also one control plane connection between the MN and a corresponding CN entity. The MN and the SN involved in MR-DC for a certain UE control their radio resources and are primarily responsible for allocating radio resources of their cells. Figure 4.3.1.1-1 shows C-plane connectivity of MN and SN involved in MR-DC for a certain UE. Figure 4.3.1.1-1: C-Plane connectivity for EN-DC (left) and MR-DC with 5GC (right).