BASE STATION, AND WIRELESS COMMUNICATION SYSTEM AND METHOD

摘要

PROBLEM TO BE SOLVED: To provide a technique for early solution to the discrepancy of the state of a secondary cell between a base station and a user device.SOLUTION: An aspect of the present invention relates to a base station, which comprises: signal transmitting/receiving units that communicate radio signals with a user device; a cell management unit that manages a primary cell and one or more secondary cells to be allocated to the user device for radio signal communication; and a validity determination unit that determines whether feedback information received from the user device is valid. When the cell management unit determines that a secondary cell set in the user device is activated in response to instructing the user device to cause the secondary cell to transition to the active state, the cell management unit monitors feedback information from the secondary cell. If feedback information that has been regarded as valid by the validity determination unit is not received within a predetermined time interval, the cell management unit determines that the secondary cell is in the inactive state.