Editing Base transceiver station (section)

== General architecture ==

A BTS is usually composed of:
; Transceiver (TRX): Provides transmission and reception of signals. It also does sending and reception of signals to and from higher network entities (like the base station controller in mobile telephony). This can be separated into a dedicated device known as a [[Remote radio head]] (RRH).
; Power amplifier (PA): Amplifies the signal from TRX for transmission through antenna; may be integrated with TRX.
; Combiner: Combines feeds from several TRXs so that they could be sent out through a single antenna. Allows for a reduction in the number of antenna used.
; Multiplexer: For separating sending and receiving signals to/from antenna. Does sending and receiving signals through the same antenna ports (cables to antenna).
; Antenna: This is the structure that the BTS lies underneath; it can be installed as it is or disguised in some way (concealed [[cell site|cellular sites]]).
; Alarm extension system: Collects working status alarms of various units in the BTS and extends them to operations and maintenance (O&M) monitoring stations.
; Control function: Controls and manages the various units of BTS, including any software. On-the-spot configurations, status changes, software upgrades, etc. are done through the control function.
; Baseband receiver unit (BBxx): Frequency hopping, signal DSP.