Method for transmitting and receiving downlink data channel and device therefor

A communication device configured to receive a physical downlink shared channel (PDSCH) in a wireless communication system, the communication device comprising:

• at least one processor;
• and
• at least one computer-readable storage medium storing instructions that, based on being executed by the at least one processor, control the communication device to:
• receive, in a first short transmission time interval (sTTI), a physical downlink control channel (PDCCH) that comprises (i) information for scheduling k repetitions of the PDSCH and (ii) rate matching information for the PDSCH;
• receive the PDSCH repeatedly in the first sTTI and (k−1) second sTTI subsequent to the first sTTI, based on the rate matching information;
• and
• transmit, in a third sTTI, a Hybrid Automatic Repeat Request-Acknowledgement (HARQ-ACK) for the repeatedly received PDSCH,
• wherein the rate matching information is identically used for each of the first sTTI and the (k−1) second sTTI, and
• wherein the third sTTI for transmitting the HARQ-ACK is determined based on a last of the (k−1) second sTTI in which the PDSCH was repeatedly received.

A method of transmitting a physical downlink shared channel (PDSCH) by a base station (BS) in a wireless communication system, the method comprising:

• transmitting, in a first short transmission time interval (sTTI), a physical downlink control channel (PDCCH) that comprises (i) information for scheduling k repetitions of the PDSCH and (ii) rate matching information for the PDSCH;
• transmitting the PDSCH repeatedly in the first sTTI and (k−1) second sTTI subsequent to the first sTTI, based on the rate matching information;
• and
• receiving, in a third sTTI, a Hybrid Automatic Repeat Request-Acknowledgement (HARQ-ACK) for the repeatedly transmitted PDSCH,
• wherein the rate matching information is identically used for each of the first sTTI and the (k−1) second sTTI, and
• wherein the third sTTI for receiving the HARQ-ACK is based on a last of the (k−1) second sTTI in which the PDSCH was repeatedly transmitted.