Method for supporting multiple transmission time intervals, multiple subcarrier intervals, or multiple processing time intervals in wireless communication system, and apparatus therefor

1. A method of transmitting uplink control information by a user equipment (UE) supporting a plurality of transmission time intervals (TTIs), a plurality of subcarrier spacings, or a plurality of processing times in a wireless communication system, the method comprising:

receiving a configuration of repeated transmission of acknowledgement/non-acknowledgement (HARQ-ACK) information for a downlink transport block; and

when the repeated transmission is triggered, transmitting the HARQ-ACK information to a base station according to the configuration of the repeated transmission,

wherein the repeated transmission is triggered when a predetermined condition is satisfied, and

wherein when the repeated transmission is triggered, uplink resources on which the HARQ-ACK information is to be transmitted in every specific number of TTIs are determined by frequency hopping.

2. The method of claim 1 , wherein when the UE is configured with a specific TTI length or a specific processing time, a size of a soft buffer for the downlink transport block is determined by a parameter for the specific TTI length or the specific processing time.

3. The method of claim 1 , wherein a parameter is different from a parameter for a reference TTI length or a reference specific processing time.

4. The method of claim 1 , wherein when the UE is configured with a specific TTI length or a specific processing time, a size of a soft buffer for the downlink transport block is configured differently depending on a service type or priority of the downlink transport block.

5. The method of claim 1 , wherein when the UE is configured with a specific TTI length or a specific processing time, the number of identifiable hybrid automatic retransmission request (HARQ) processes is configured differently depending on a service type or priority of the downlink transport block.

6. The method of claim 1 , wherein the repeated transmission is triggered when a payload size or a coding rate of the HARQ-ACK information is equal to or greater than a threshold.

7. The method of claim 6 , wherein the number of times of the repeated transmission is determined according to the payload size or the coding rate.

8. The method of claim 1 , wherein the repeated transmission is triggered when the UE is configured with a plurality of serving cells.

9. The method of claim 1 , wherein the repeated transmission is triggered by a specific field in downlink control information related to the downlink transport block.

10. The method of claim 1 , wherein the repeated transmission is triggered when a transmission timing of an uplink channel for transmitting the HARQ-ACK information overlaps with a transmission timing of a different uplink channel.

11. The method of claim 10 , wherein transmission of the different uplink channel is dropped or stopped.

12. The method of claim 10 , wherein uplink control information to be transmitted on the different uplink channel is transmitted together on the uplink channel for transmitting the HARQ-ACK information.

13. The method of claim 1 , wherein the repeated transmission is triggered when a transmission timing of an uplink channel for transmitting the HARQ-ACK information overlaps with a transmission timing of a different uplink channel and when a payload size of the HARQ-ACK information and a payload size or a coding rate of uplink control information to be transmitted on the different uplink channel are equal to or greater than a threshold.

14. The method of claim 1 , wherein a pattern of the frequency hopping is determined according to the number of times of the repeated transmission.

15. The method of claim 1 , wherein when the repeated transmission is triggered, a demodulation reference signal is transmitted in a TTI or a symbol indicated by a higher layer signal or a physical layer signal.

16. The method of claim 1 , wherein when the repeated transmission is triggered, sharing of a demodulation reference signal in TTIs where the repeated transmission is performed is enabled by a higher layer signal or a physical layer signal.

17. The method of claim 1 , wherein when the repeated transmission is triggered and when a transmission timing of an uplink channel for transmitting the HARQ-ACK information partially or completely overlaps with a transmitting timing of a different uplink channel, HARQ-ACK information to be transmitted in a TTI overlapping with the transmitting timing of the different uplink channel among TTIs where the repeated transmission is performed is dropped.

18. The method of claim 1 , wherein when the repeated transmission is triggered and when a transmission timing of an uplink channel for transmitting the HARQ-ACK information partially or completely overlaps with a transmitting time of a different uplink channel, the uplink channel for transmitting the HARQ-ACK information and the different uplink channel are simultaneously transmitted.

19. A user equipment (UE) for supporting a plurality of transmission time intervals (TTIs), a plurality of subcarrier spacings, or a plurality of processing times in a wireless communication system, the UE comprising:

a receiver;

a transmitter; and

a processor configured to control the receiver and the transmitter,

wherein the processor is configured to receive a configuration of repeated transmission of acknowledgement/non-acknowledgement (HARQ-ACK) information for a downlink transport block and transmit the HARQ-ACK information to a base station according to the configuration of the repeated transmission when the repeated transmission is triggered,

wherein the repeated transmission is triggered when a predetermined condition is satisfied, and

wherein when the repeated transmission is triggered, uplink resources on which the HARQ-ACK information is to be transmitted in every specific number of TTIs are determined by frequency hopping.