The term Node B (NB) or NodeB is used in UMTS for the radio base station. In the System Architecture Evolution (SAE) of Long Term Evolution (LTE) it is the Evolved Node B (eNodeB or eNB) and in 5G it is the Next Generation NodeB (gNB). In all mobile networks, it is the station connected to the mobile network that communicates directly with the mobile device.
The UMTS base station Node B has limited functionality and is controlled by the radio network controller (RNC). It supplies several UMTS radio cells and usually consists of three antennas, each of which transmits with a transmission power of 20 W. By adapting the transmission power to the reception field strength of the mobile device, the maximum transmission power of 20 W is normally not exceeded. The situation is different if the NodeB supports High Speed Downlink Packet Access (HSDPA).