Patent ID: 8849298

Claim:
A mobile telecommunication system, comprising a network base station configured to variably set a transmit power by using a relationship between a signal to interference and noise ratio received from a user equipment and upper and lower limits of a predetermined reference signal to interference and noise ratio, wherein, when the signal to interference and noise ratio is equal to or lower than the lower limit of the reference signal to interference and noise ratio, the transmit power is set to a maximum level and, when the signal to interference and noise ratio is equal to or higher than the upper limit of the reference signal to interference and noise ratio, the transmit power is set to a minimum level, wherein the network base station is a small base station, the small base station including at least one of a femto base station, a pico base station, a micro base station, an indoor base station, or a relay for use in cell expansion, and wherein the signal to interference and noise ratio includes information on interference caused by at least one of a neighboring small base station, interference caused by a neighboring outdoor base station, noise component of the user equipment or signal component of the user equipment.