ENodeB

Quality 0.50 · 1 view · Updated 2 months ago

Mobile phone network element

title: "ENodeB" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["lte-(telecommunication)", "telecommunications-infrastructure"] description: "Mobile phone network element" topic_path: "engineering" source: "https://en.wikipedia.org/wiki/ENodeB" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Mobile phone network element ::

E-UTRAN Node B, also known as Evolved Node B (abbreviated as eNodeB or eNB), is the element in E-UTRA of LTE that is the evolution of the element Node B in UTRA of UMTS. It is the hardware that is connected to the mobile phone network that communicates directly wirelessly with mobile handsets (UEs), like a base transceiver station (BTS) in GSM networks. ::figure[src="https://upload.wikimedia.org/wikipedia/commons/7/7c/CableFree_LTE_Remote_Radio_Head_(RRH).jpg" caption="CableFree 4G/5G Remote Radio Head (RRH) with 2x2 MIMO, 2x20W RF power and CPRI fibre interface"] ::

Traditionally, a Node B has minimum functionality, and is controlled by a Radio Network Controller (RNC). However, with an eNB, there is no separate controller element. This simplifies the architecture and allows faster response times.

Differences between an evolved Node B and a Node B

Air interface

eNB uses the E-UTRA protocols OFDMA (downlink) and SC-FDMA (uplink) on its LTE-Uu interface. By contrast, NodeB uses the UTRA protocols WCDMA or TD-SCDMA on its Uu interface.

Control functionality

eNB embeds its own control functionality, rather than using a RNC (Radio Network Controller) as does a Node B.

Network interfaces

eNB interfaces with the System Architecture Evolution (SAE) core (also known as Evolved Packet Core (EPC)) and other eNB as follows:

eNB uses the S1-AP protocol on the S1-MME interface with the Mobility Management Entity (MME) for control plane traffic.

References

3GPP TS 36.300 V11.0.0 (2011-12)

::callout[type=info title="Wikipedia Source"] This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page. ::