An aspect of the disclosure includes a method for, including: determining a first set of candidate number of a first set of aggregation level (AL) for receiving a first DCI; and receiving the first DCI according to the first set of candidate number and the first set of AL on a first cell, wherein the first DCI is configured for scheduling PDSCHs on a plurality of cells, and the plurality of cells comprises a second cell and a third cell, and the first set of candidate number and the first set of AL are corresponding to a search space with a first identity.