Patent ID: 8923878

Claim:
A mobile communication system in which the same frequency is configured to be repeatedly used in a plurality of cells, wherein, a mobile station comprises: a reception quality measurement unit configured to measure, when a radio link is established with two or more cells, a reception quality of a pilot signal of each of the two or more cells; a channel quality information transmission unit configured to transmit, to a first cell having the best reception quality among the two or more of cells, channel quality information corresponding to the reception quality; and a control signal transmission unit configured to transmit, to a cell other than the first cell among the two or more cells, a control signal requesting a second cell other than the first cell to transmit the channel quality information corresponding to the reception quality of the pilot signal of the second cell and requesting the first cell not to transmit a data signal by using the same resource as the second cell, wherein the control signal transmission unit is configured to transmit the control signal, only when the reception quality in the cell other than the first cell falls below a predetermined threshold value; a radio base station that manages the cell other than the first cell comprises: a scheduling unit configured to perform scheduling in a downlink; and the scheduling unit of the radio base station that manages the first cell is configured to perform scheduling not to transmit the data signal by using the same resource as the second cell, when the control signal is received from the mobile station.