摘要 |
A base station used as a first base station in a radio communication system including the first base station, a second base station communicating via the first base station with a user device, and the user device communicating with the first base station. The base station includes a first receiver that receives an uplink signal transmitted from the user device; a measurer that measures a timing difference between a timing of receiving the uplink signal and a predetermined reference timing retained by the base station; and a first transmitter that transmits, to the user device, a command that is generated based on the timing difference and used to control a transmission timing at which the user device transmits the uplink signal. |