The Concept introduction of 5G EN-DC/NE-DC/NGEN-DC
Due to the differences in specific implementation, it contains 3 architectures: EN-DC (option 3), NE-DC (Option 4) and NGEN-DC (Option 7). DC stands for Dual Connectivity; E stands for E-UTRA: 4G wireless Access network; N stands for NR: 5G new wireless; NG stands for the next generation core network: 5G core network.