| 摘要 |
PROBLEM TO BE SOLVED: To provide a technology for simultaneously transmitting uplink control channels in a plurality of cells in a radio communication system supporting transmission of an uplink control channel in a secondary cell.SOLUTION: In one embodiment of the present invention, a user device comprises: a transmission/reception unit for transmitting/receiving radio channels to/from an evolved node B through a plurality of cells set by carrier aggregation; a simultaneous transmission propriety determination unit for determining whether uplink control channels can be simultaneously transmitted by the plurality of cells, in response to generation of an event of simultaneously transmitting the uplink control channels by the plurality of cells; and a transmission control unit which instructs the transmission/reception unit to simultaneously transmit the uplink control channels by the plurality of cells when the uplink control channels can be simultaneously transmitted by the plurality of cells, and controls transmission of the uplink control channels according to transmission priority when the uplink control channels cannot be simultaneously transmitted by the plurality of cells. |
