Method and apparatus for transmitting downlink control channel information in carrier aggregation system

A user equipment (UE) for receiving control information and downlink data in a wireless communication system, the UE comprising:

• a transceiver;
• and
• a processor coupled with the transceiver and configured to:
• receive first configuration information on a cell group configured for the UE among a plurality of cell groups and second configuration information on cross carrier scheduling associated with the cell group, the cell group comprising a scheduling cell and a scheduled cell,
• receive carrier indicator field (CIF) information corresponding to the scheduled cell on a downlink control channel being monitored on the scheduling cell, based on the first configuration information and the second configuration information, and
• receive data on a downlink data channel or transmit data on a uplink data channel of the scheduled cell included in the same cell group as the scheduling cell among the plurality of cell groups, based on the CIF information with a predetermined number of bits.

A method for transmitting control information and downlink data by a base station in a wireless communication system, the method comprising:

• transmitting first configuration information on a cell group configured for a user equipment (UE) among a plurality of cell groups and second configuration information on cross carrier scheduling associated with the cell group, the cell group comprising a scheduling cell and a scheduled cell;
• transmitting carrier indicator field (CIF) information corresponding to the scheduled cell on a downlink control channel being monitored on the scheduling cell, based on the first configuration information and the second configuration information;
• and
• transmitting data on a downlink data channel or receiving data on a uplink data channel of the scheduled cell included in the same cell group as the scheduling cell among the plurality of cell groups, based on the CIF information with a predetermined number of bits.

A base station for transmitting control information and downlink data in a wireless communication system, the base station comprising:

• a transceiver;
• and
• a processor coupled with the transceiver and configured to:
• transmit first configuration information on a cell group configured for a user equipment (UE) among a plurality of cell groups and second configuration information on cross carrier scheduling associated with the cell group, the cell group comprising a scheduling cell and a scheduled cell,
• transmit carrier indicator field (CIF) information corresponding to the scheduled cell on a downlink control channel being monitored on the scheduling cell, based on the first configuration information and the second configuration information, and
• transmit data on a downlink data channel or receive data on a uplink data channel of the scheduled cell included in the same cell group as the scheduling cell among the plurality of cell groups, based on the CIF information with a predetermined number of bits.