Method and apparatus for transmitting and receiving downlink data

1. A method of receiving, by a user equipment (UE) configured to operate in transmission mode 10, Physical Downlink Shared Channel (PDSCH) in a wireless communication system, the method comprising:

receiving, in a short transmission time interval (sTTI), downlink control information (DCI) that comprises Quasi Co-Location Indicator (PQI) information related to PDSCH resource element (RE) mapping and PDSCH antenna port Quasi Co-location (QCL) for the sTTI; and

receiving, in the sTTI and at least one sTTI subsequent to the sTTI, repeated transmissions of the PDSCH based on the PQI information,

wherein the PQI information is commonly used for the sTTI and all of the at least one sTTI.

2. The method of claim 1 , further comprising:

decoding the repeated transmissions of the PDSCH based on the PQI information.

3. The method according to claim 1 , wherein receiving the repeated transmissions of the PDSCH comprises:

receiving the PDSCH which is repeatedly transmitted in the sTTI and the at least one sTTI from a same transmission point (TP).

4. The method according to claim 1 , wherein the sTTI is included in a first subframe and at least part of the at least one sTTI is included in a second subframe, and

wherein the first subframe is located immediately before the second subframe.

5. The method according to claim 1 , wherein the DCI is related to cell-radio network temporary identifier (C-RNTI)-based data scheduling.

6. The method according to claim 1 , wherein the sTTI and the at least one sTTI are consecutive in time.

7. An apparatus configured to operate in transmission mode 10, the apparatus comprising:

at least one processor; and

at least one memory operably connectable to the at least one processor and storing instructions that, when executed by the at least one processor, perform operations for receiving a Physical Downlink Shared Channel (PDSCH), the operations comprising:

receiving, in a short transmission time interval (sTTI), downlink control information (DCI) that comprises QuasiCoLocation Indicator (POI) information related to PDSCH resource element (RE) mapping and PDSCH antenna port Quasi Co-location (QCL) for the sTTI; and

receiving, in the sTTI and at least one sTTI subsequent to the sTTI, repeated transmissions of the PDSCH based on the PQI information,

wherein the PQI information is commonly used for the sTTI and all of the at least one sTTI.

8. The apparatus of claim 7 , wherein the operations further comprise:

decoding the repeated transmissions of the PDSCH based on the PQI information.

9. The apparatus according to claim 7 , wherein receiving the repeated transmissions of the PDSCH comprises:

receiving the PDSCH which is repeatedly transmitted in the sTTI and the at least one sTTI from a same transmission point (TP).

10. The apparatus according to claim 7 , wherein the sTTI is included in a first subframe and at least part of the at least one sTTI is included in a second subframe, and

wherein the first subframe is located immediately before the second subframe.

11. The apparatus according to claim 7 , wherein the DCI is related to cell-radio network temporary identifier (C-RNTI)-based data scheduling.

12. The apparatus according to claim 7 , wherein the sTTI and the at least one sTTI are consecutive in time.

13. A method of transmitting downlink data by a base station (BS) operating based on transmission mode 10 in a wireless communication system, the method comprising:

transmitting, in a short transmission time interval (sTTI), downlink control information (DCI) that comprises PQI information related to PDSCH resource element (RE) mapping and PDSCH antenna port Quasi Co-location (QCL) for the sTTI; and

transmitting, in the sTTI and at least one sTTI subsequent to the sTTI, repeated transmissions of the PDSCH based on the PQI information,

wherein the PQI information is commonly used for the sTTI and all of the at least one sTTI.

14. A user equipment (UE) configured to operate in transmission mode 10, the UE comprising:

at least one transceiver;

at least one processor; and

at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed by the at least one processor, perform operations for receiving a Physical Downlink Shared Channel (PDSCH), the operations comprising:

receiving, through the at least one transceiver and in a short transmission time interval sTTI, downlink control information (DCI) that comprises QuasiCoLocation Indicator (PQI) information related to PDSCH resource element (RE) mapping and PDSCH antenna port Quasi Co-location (QCL) for the sTTI; and

receiving, through the at least one transceiver and in the sTTI and at least one sTTI subsequent to the sTTI, repeated transmissions of the PDSCH based on the PQI information,

wherein the PQI information is commonly used for the sTTI and all of the at least one sTTI.

15. A base station (BS) configured to operate based on transmission mode 10, the BS comprising:

at least one transceiver; and

at least one processor; and

at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed by the at least one processor, perform operations comprising:

transmitting, through the at least one transceiver and in a short transmission time interval sTTI, downlink control information (DCI) that comprises QuasiCoLocation Indicator (POI) information related to PDSCH resource element (RE) mapping and PDSCH antenna port Quasi Co-location (QCL) for the sTTI; and

transmitting, through the at least one transceiver and in the sTTI and at least one sTTI subsequent to the sTTI, repeated transmissions the PDSCH based on the PQI information,

wherein the PQI information is commonly used for the sTTI and all of the at least one sTTI.