An Evolved Node B, usually written eNodeB or eNB, is the base station in an LTE mobile network. It provides the radio connection for a phone or other user equipment (UE) and links that equipment to the LTE core network, the Evolved Packet Core (EPC). In LTE, radio-network control functions that were split between a 3G Node B and a separate Radio Network Controller are brought together at the eNodeB. TTA’s telecommunications terminology entry identifies the term and its role.
Where the eNodeB fits in an LTE network
The eNodeB is part of the E-UTRAN (Evolved Universal Terrestrial Radio Access Network), LTE’s radio access network. The EPC is the core network on the other side of the connection. At a simplified level, the path is:
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UE ⇄ radio interface ⇄ eNodeB ⇄ EPC
The UE may be a mobile phone or another device with an LTE connection. The eNodeB handles the radio-access side and relays communication between the UE and the EPC. The TTA terminology entry describes the eNodeB as connecting directly toward the core, rather than through a separate RNC.
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What “evolved” changed from 3G
In 3G UMTS, the Node B was the radio base station, while a separate Radio Network Controller (RNC) handled related radio-network control functions. LTE reorganized that arrangement: its eNodeB assumes functions that were divided between those 3G elements and connects directly toward the EPC.
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| Aspect | 3G UMTS | LTE |
|---|---|---|
| Radio base station | Node B | eNodeB (eNB) |
| Radio-network control arrangement | Node B and a separate RNC | eNodeB takes on functions previously split between Node B and RNC |
| Radio access and core architecture | UTRAN / UMTS | E-UTRAN / EPC |
This is an architectural distinction, not a claim that all network equipment is housed in one physical cabinet or that every deployment implements every feature identically. The terminology describes the logical network role.
eNodeB is LTE terminology, not 5G gNodeB
An eNodeB belongs to LTE. The corresponding base-station term in 5G New Radio is gNodeB (gNB). They are not interchangeable names: TTA’s terminology comparison distinguishes eNodeB for LTE from gNodeB for 5G.
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What eNodeB security standards specify
The term also appears in security standards. 3GPP TS 33.216, Release 18, version 18.1.0 sets security-assurance objectives, requirements, and test cases for the eNB network product class. Among its requirements are control-plane confidentiality and integrity protections on S1/X2 and user-plane ciphering between Uu and S1/X2. For example, the specification states: “The eNB shall provide confidentiality protection for control plane packets on the S1/X2 reference points.” These are specification requirements; they do not establish that a particular commercial product or network configuration has been tested or meets them.
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1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsVersions matter when citing requirements. The ETSI work-item record lists TS 33.216 version 19.1.0, Release 19 as published on 2026-01-29. That record identifies a later version than the Release 18 specification cited above; a requirement should therefore be tied to the specific release and version being discussed.
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