A terminal apparatus comprising: a reception unit configured to receive a first parameter indicating a first transmission mode of a physical downlink shared channel, PDSCH, and a second parameter indicating a second transmission mode of a short PDSCH, sPDSCH, wherein the reception unit is configured to, by using radio resource control, RRC, signalling, receive a third parameter being either short TTI, sTTI, pattern information or information regarding a TTI mode, wherein a sTTI is shorter than a TTI; a control unit configured to, in case that the third parameter is the sTTI pattern information, configure an sTTI mode, wherein the control unit is configured to, in case that the third parameter is the information regarding the TTI mode, configure the TTI mode; and a decoding unit configured to determine a transmission mode for the PDSCH based on the first parameter, determine a transmission mode for the sPDSCH based on the second parameter, determine a first type of DCI format of the PDCCH to be monitored based on the transmission mode for the PDSCH, and determine a second type of DCI format of the sPDCCH to be monitored based on the transmission mode for the sPDSCH, wherein the decoding unit is configured to, in case that the TTI mode is configured, attempt to decode a physical downlink control channel, PDCCH, with a first DCI format, the first DCI format corresponding to the determined transmission mode for the PDSCH, and the decoding unit is configured to, in case that the sTTI mode is configured, attempt to decode a short PDCCH, sPDCCH, with a second DCI format in a UE specific search space, USS, the second DCI format corresponding to the determined transmission mode for the sPDSCH, and the USS is a set of sPDCCH candidates. a reception unit configured to receive a first parameter indicating a first transmission mode of a physical downlink shared channel, PDSCH, and a second parameter indicating a second transmission mode of a short PDSCH, sPDSCH, wherein the reception unit is configured to, by using radio resource control, RRC, signalling, receive a third parameter being either short TTI, sTTI, pattern information or information regarding a TTI mode, wherein a sTTI is shorter than a TTI; a control unit configured to, in case that the third parameter is the sTTI pattern information, configure an sTTI mode, wherein the control unit is configured to, in case that the third parameter is the information regarding the TTI mode, configure the TTI mode; and a decoding unit configured to determine a transmission mode for the PDSCH based on the first parameter, determine a transmission mode for the sPDSCH based on the second parameter, determine a first type of DCI format of the PDCCH to be monitored based on the transmission mode for the PDSCH, and determine a second type of DCI format of the sPDCCH to be monitored based on the transmission mode for the sPDSCH, wherein the decoding unit is configured to, in case that the TTI mode is configured, attempt to decode a physical downlink control channel, PDCCH, with a first DCI format, the first DCI format corresponding to the determined transmission mode for the PDSCH, and the decoding unit is configured to, in case that the sTTI mode is configured, attempt to decode a short PDCCH, sPDCCH, with a second DCI format in a UE specific search space, USS, the second DCI format corresponding to the determined transmission mode for the sPDSCH, and the USS is a set of sPDCCH candidates.