Abstract: A method, user equipment, base station and system for determining a component carrier scheduled in cross-carrier scheduling. The method for determining the scheduled component carrier includes: a user equipment (UE) detects scheduling information sent by a base station in a first dedicated searching space corresponding to a scheduling component carrier, the first dedicated searching space includes at least one candidate physical downlink control channel (PDCCH) (101); detecting at least one candidate physical downlink control channel (PDCCH) to obtain a current physical downlink control channel (PDCCH) which belongs to the user equipment (UE) (102); determining a scheduled component carrier corresponding to the current physical downlink control channel (PDCCH) according to the location of the current physical downlink control channel (PDCCH) and the carried carrier indicator field (CIF) value thereof (103).

Abstract: A method, device, terminal, base station and system for cross-carrier scheduling are disclosed. Said method for cross-carrier scheduling includes: according to the number of component carriers involved in cross-carrier scheduling, adjusting the size of the control part, which is used for transmitting control information, in the frame corresponding to the component carrier; performing cross-carrier scheduling by utilizing the adjusted control part. According to the present invention, the situation that the number of component carriers involved in cross-carrier scheduling increases can be adapted to, and the block situation caused by no resources for transmitting the control information can be avoided.