A method of reducing power consumption of a small cell base station that is integrated into a wireless communications network, the small cell base station associated with a closed group of mobile stations and located in a coverage area of a macrocell base station of the wireless communications network, the method comprising: transmitting, by the small cell base station to the wireless communications network, status information indicating that the small cell base station is to enter a sleep mode in which no power is consumed, the small cell base station entering the sleep mode either when no mobile stations of the closed group are located in a coverage area of the small cell base station or when all mobile stations of the closed group that are located in the coverage area of the small cell base station are in an idle mode; and during an attempt by one of the mobile stations to access the wireless communications network involving the macrocell base station and occurring while the small cell base station is in the sleep mode: determining, by the wireless communications network, that the mobile station is in the coverage area of the small cell base station, delaying, by the wireless communications network, the access attempt, and harvesting, by the small cell base station, radio frequency, RF, energy from one or more signals transmitted by the mobile station during the access attempt, the harvested RF energy triggering a wake-up procedure of the small cell base station in order for access to the wireless communications network to be granted to the mobile station via the small cell base station. transmitting, by the small cell base station to the wireless communications network, status information indicating that the small cell base station is to enter a sleep mode in which no power is consumed, the small cell base station entering the sleep mode either when no mobile stations of the closed group are located in a coverage area of the small cell base station or when all mobile stations of the closed group that are located in the coverage area of the small cell base station are in an idle mode; and during an attempt by one of the mobile stations to access the wireless communications network involving the macrocell base station and occurring while the small cell base station is in the sleep mode: determining, by the wireless communications network, that the mobile station is in the coverage area of the small cell base station, delaying, by the wireless communications network, the access attempt, and harvesting, by the small cell base station, radio frequency, RF, energy from one or more signals transmitted by the mobile station during the access attempt, the harvested RF energy triggering a wake-up procedure of the small cell base station in order for access to the wireless communications network to be granted to the mobile station via the small cell base station. determining, by the wireless communications network, that the mobile station is in the coverage area of the small cell base station, delaying, by the wireless communications network, the access attempt, and harvesting, by the small cell base station, radio frequency, RF, energy from one or more signals transmitted by the mobile station during the access attempt, the harvested RF energy triggering a wake-up procedure of the small cell base station in order for access to the wireless communications network to be granted to the mobile station via the small cell base station.