TERMINAL DEVICE, BASE-STATION DEVICE, COMMUNICATION METHOD, AND INTEGRATED CIRCUIT

摘要

This terminal device, which communicates with a base-station device, is provided with a reception unit that decodes a downlink control channel (PDCCH) or an enhanced downlink control channel (EPDCCH) that contains a downlink control information (DCI) format. If a primary cell is using time-division duplexing (TDD), said DCI format, which is used for the implementation of said TDD, contains a downlink assignment index (DAI) field. If the primary cell is using frequency-division duplexing (FDD), the DCI format does not contain said DAI field.