1. A signal transmission and reception method for a user equipment (UE) using multiple cells in a wireless communication system supporting carrier aggregation, the method comprising:receiving first information indicating a probability of whether an uplink is scheduled in first uplink subframes from a primary cell (PCell) and second information indicating a probability of whether an uplink is scheduled in second uplink subframes from a secondary cell (SCell);
receiving uplink control information for the PCell and the SCell conforming to different uplink-downlink configurations;
determining whether an uplink signal is transmitted in a third uplink subframe, scheduled to transmit the uplink signal by the uplink control information based on at least one of the first information and the second information; and
transmitting the uplink signal when the UE determines to transmit the uplink signal in the third uplink subframe,
wherein the third uplink subframe is one of the first and the second uplink subframes.