eNB or eNodeB -
eNB interfaces with the mobile and is responsible for hosting and managing following interfaces.
Medium Access Control (MAC),
Radio Link Control (RLC),
Packet Data Control Protocol (PDCP) layers.
Radio Resource Control (RRC) in control plane.
Also manages many functions related to :-
Radio resource management,
Enforcement of negotiated UL QoS,
Cell information broadcast,
Ciphering /deciphering of user and control plane data,
Compression /decompression of DL/UL user plane packet headers.