The determining, according to the search space of the scheduling carrier configured for the terminal and the scaling factor, the search space of the scheduled carrier includes: determining, according to the quantity of candidate physical downlink control channels (PDCCH) included in each aggregation level of the scheduling carrier and the scaling factor, the quantity of candidate PDCCHs included in each aggregation level of the search space of the scheduled carrier; and determining, according to the quantity of candidate PDCCHs included in each aggregation level of the search space of the scheduled carrier, the search space of the scheduled carrier.
The determining, according to the quantity of candidate PDCCHs included in each aggregation level of the scheduling carrier and the scaling factor, the quantity of candidate PDCCHs included in each aggregation level of the scheduled carrier includes: determining the quantity of candidate PDCCHs included in each aggregation level of the scheduled carrier through ALY,scheduled=┌ALY,scheduling×K┐ or ALY,scheduled=└ALY,scheduling×K┘.
ALY,scheduled is the quantity of candidate PDCCHs included in each aggregation level of the scheduled carrier.
K is a scaling factor of the scheduling carrier.
┌ ┐ refers to rounding up, and └ ┘ refers to rounding down.
In a case that ALY,scheduling≠0, a minimum value of ALY,scheduled is 1.
The search space of the scheduling carrier is larger than a search space of a scheduled carrier.
A starting position of the search space of the scheduled carrier in the search space of the scheduling carrier is determined according to a value of a carrier indicator field (CIF).