EN-DC
E-UTRA New Radio Dual Connectivity
Radio Access NetworkIntroduced Rel-15
Definition
A non-standalone 5G deployment option where a UE connects simultaneously to an LTE eNodeB (master) and an NR gNodeB (secondary), sharing an EPC core.
Evolution Across Releases
- Introduced in Rel-15 as the first commercially deployed 5G architecture ahead of standalone 5GC rollout.
Related Specifications
TS 36.300
Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2
Architecture
Rel-15TSLTE-Advanced ProUpdated 2026-07-25
TS 37.340
Evolved Universal Terrestrial Radio Access (E-UTRA) and NR; Multi-connectivity; Overall Description; Stage-2
Architecture
Rel-15TSMulti-RATUpdated 2026-07-25