Terminal apparatus, base station apparatus, communication method, and integrated circuit
A terminal apparatus includes a higher layer processing unit configured to configure transmission mode information; and a reception unit configured to receive a physical downlink shared channel and a short physical downlink shared channel, and the transmission mode information indicates a transmission mode for the physical downlink shared channel and a transmission mode for the short physical downlink shared channel.
1. A terminal apparatus comprising:
receiving circuitry 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 (sPDCCH); and
decoding circuitry configured to attempt to decode a physical downlink control channel (PDCCH) with a first DCI format, the first DCI format corresponding to the first transmission mode, wherein
the decoding circuitry is configured to, in a case that a third parameter 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 second transmission mode; and
the USS is a set of sPDCCH candidates.
2. The terminal apparatus according to claim 1 , wherein
the third parameter indicates at least a length of a short transmission time interval (sTTI);
the sPDCCH is mapped to the sTTI; and
the length of the sTTI is 2, or 7 orthogonal frequency division multiplexing (OFDM) symbols.
3. A base station apparatus comprising:
radio resource control circuitry configured to transmit 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 (sPDCCH); and
transmitting circuitry configured to transmit a physical downlink control channel (PDCCH) with a first DCI format, the first DCI format corresponding to the first transmission mode, wherein
the transmitting circuitry is configured to, in a case that a third parameter is configured, transmit a short PDCCH (sPDCCH) with a second DCI format in a UE specific search space (USS), the second DCI format corresponding to the second transmission mode; and
the USS is a set of short PDCCH candidates.
4. The base station apparatus according to claim 3 , wherein
the third parameter indicates at least a length of a short transmission time interval (sTTI),
the sPDCCH is mapped to the sTTI, and
the length of the sTTI is 2, or 7 orthogonal frequency division multiplexing (OFDM) symbols.
5. A communication method for a terminal apparatus comprising:
receiving 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 (sPDCCH);
attempting to decode a physical downlink control channel (PDCCH) with a first DCI format, the first DCI format corresponding to the first transmission mode; and
in a case that a third parameter is configured, attempting 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 second transmission mode, wherein
the USS is a set of sPDCCH candidates.
6. A communication method for a base station apparatus comprising:
transmitting 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);
transmitting a physical downlink control channel (PDCCH) with a first DCI format, the first DCI format corresponding to the first transmission mode; and
in a case that a third parameter is configured, transmitting a short PDCCH (sPDCCH) with a second DCI format in a UE specific search space (USS), the second DCI format corresponding to the second transmission mode, wherein
the USS is a set of short PDCCH candidates.