Patent ID: 8805398
Filing Date: 2014-08-12
Classification: H04B,H04W

Abstract:
1. A radio communication system comprising: at least one first base station which transmits a first downlink radio signal; a second base station which transmits a second downlink radio signal; at least one radio terminal configured to receive the first downlink radio signal and the second downlink radio signal; wherein the second base station comprises a control unit that controls a transmission power of the second downlink radio signal based on a calculated difference between the reception quality of the second downlink radio signal and the reception quality of the first downlink radio signal measured by the at least one radio terminal, such that a reception quality of the second downlink radio signal exceeds a second predetermined value of reception quality at a position of the at least one radio terminal at which a reception quality of the first downlink radio signal is lower than a first predetermined value of reception quality based on a measurement value of the reception quality of the first downlink radio signal by the at least one radio terminal; wherein, when the at least one radio terminal calculates the calculated difference between the reception quality of the second downlink radio signal and the reception quality of the first downlink radio signal at a position of the at least one radio terminal at which the reception quality of the first downlink radio signal exceeds the first predetermined value and the reception quality of the second downlink radio signal exceeds the reception quality of the first downlink radio signal, the control unit decreases the transmission power of the second downlink radio signal based on the calculated difference.