A mobile station is capable of exchanging control information in a communication system. A mobile station transceiver receives downlink control information on an Enhanced Physical Downlink Control Channel (EPDCCH) comprising a Enhanced Control Channel Elements (ECCE). A mobile station controller identifies a first resource for uplink control information based on the first ECCE of the at least one ECCE, a resource offset configured for the EPDCCH, and ACK/NACK resource offset on the EPDCCH, when the EPDCCH is distributed transmission, and also identifies a second resource for uplink control information based on the first ECCE of the at least one ECCE, a resource offset configured for the EPDCCH, ACK/NACK resource offset on the EPDCCH and C-RNTI, if the EPDCCH is localized transmission. The transceiver also transmits the uplink control information on the first resource or the second resource according to whether the EPDCCH is distributed transmission or localized transmission.