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evolved node B (LTE) (eNB)

The Evolved Node B (eNodeB or eNB) in LTE networks is functionally equivalent to the Node B( NodeB) in UMTS and and the Next Generation NodeB( gNB) in 5G. In all mobile networks, it is the station that is directly connected to the mobile network and that communicates directly with the user equipment( UE).

In the Evolved Packet Core( EPC), which is the core structure of the System Architecture Evolution( SAE), the eNodeB belongs to the access networkE- UTRAN and is directly connected to the Mobility Management Entity( MME) and the Serving Gateway( SGW).

Architecture of the Evolved Packet Core (EPC).

Architecture of the Evolved Packet Core (EPC).

The eNodeB interfaces with the subscriber equipment and supports the Physical Layer, Medium Access Control( MAC), Radio Link Control( RLC), and Packet Data Convergence Protocol( PDCP). It also has Radio Resource Control( RRC) and corresponds with the control plane. Other functions include Radio Resource Management( RRM), compression for uplink and downlink, admission control and quality of service selection.

In 5th generation (5G) cellular networks, the Relay Node (RN) is connected to an eNodeB (eNB) of a macrocell. This Evolved Node is called Donor eNodeB (DeNB) and provides a modified interface between the Evolved NodeB (eNB) and the subscriber equipment (UE).


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