Reducing power consumption of indoor base stations

System, method and indoor antenna for reducing power consumption of base stations providing indoor coverage. The system comprises a base station (1), at least one indoor antenna (2) connected to the base station (1) providing coverage in an indoor coverage area and means for detecting human presence in a detection area. The base station (1) is configured to: receive (40) the information provided by the means for detecting human presence; check (42), according to said information, if human presence has been detected in the detection area, and in that case switch on (44) the base station (1); if human presence has not been detected in the detection area: check (45) if there is no traffic in the base station (1) during a predetermined period of time, and in that case switch off (46) the base station (1).