Patent ID: 8451790

Claim:
A method for transmitting downlink control information, comprising: a base station configuring a physical downlink shared channel carrier set (PDSCH carrier set) for a user equipment (UE); when said base station determining it is not configured with a carrier indicator field, the base station transmitting a physical downlink control channel (PDCCH) on each downlink component carrier within said physical downlink shared channel carrier set (PDSCH carrier set); said physical downlink control channel (PDCCH) bearing corresponding downlink control information; and said UE detecting the corresponding downlink control information on said each downlink component carrier within the physical downlink shared channel carrier set (PDSCH carrier set); and when said base station determining it is configured with the carrier indicator field, the base station further configuring a physical downlink control channel carrier set (PDCCH carrier set), and transmitting a physical downlink control channel on each downlink component carrier within said configured physical downlink control channel carrier set (PDCCH carrier set); said physical downlink control channel (PDCCH) bearing the corresponding downlink control information; and said UE detecting the corresponding downlink control information on said each downlink component carrier within the physical downlink control channel carrier set (PDCCH carrier set).