Base station (in communications)

[A mobile phone base station is] a transmission and reception station in a fixed location, consisting of one or more receive/transmit antenna, microwave dish, and electronic circuitry, used to handle cellular traffic.

It serves as a bridge between all mobile users in a cell and connects mobile calls to the mobile switching center.

Source: Canadian Radio-television and Telecommunications Commission ; Data Collection - Telecommunications Glossary  

In the case of cordless phones, a wireless handset communicates via radio waves with a base station connected to a telephone landline, usually within a limited range of its base station (which has the handset cradle). In this case, the base station is on the subscriber’s premises, and is attached to the telephone network the same way a corded telephone is.

Source: GreenFacts

Deutsch: Basisstation (in communications)
Español: Estación base (en telecomunicaciones)
Français: Station de base (en télécommunications)