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Dual Connectivity

E-UTRA-NR Dual Connectivity (EN-DC)

in 5G, Dual Connectivity, E-UTRA-NR Dual Connectivity, EN-DC
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E-UTRAN supports MR-DC via E-UTRA-NR Dual Connectivity (EN-DC), also called MR-DC with EPC, in which a UE is connected to one eNB that acts as a MN and one en-gNB that acts as a SN. The eNB is connected to the EPC via the S1 interface and to the en-gNB via the X2 interface. The en-gNB might also be connected to the EPC via the S1-U interface and other en-gNBs via the X2-U interface.

Dual Connectivity (DC) and Multi-Radio Dual Connectivity (MR-DC)

in 5G, Dual Connectivity, MR-DC, Multi-Radio Dual Connectivity, 4G
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E-UTRAN supports Dual Connectivity (DC) operation whereby a multiple Rx/Tx UE in RRC_CONNECTED is configured to utilise radio resources provided by two distinct schedulers, located in two eNBs connected via a non-ideal backhaul over the X2 interface