Method and device for transmitting acknowledgement information by user equipment in wireless communication system

1. A method for transmitting acknowledgement information by a user equipment (UE) in a wireless communication system, the method comprising:

receiving downlink control information scheduling 2 transmission blocks (TBs), each of the TBs including one or more code block groups (CBGs);

receiving first downlink data related to the 2 TBs based on the downlink control information; and

transmitting CBG level acknowledgement (ACK) information regarding (i) first ACK information related to a first TB in the received first downlink data and (ii) second ACK information related to a second TB in the received first downlink data,

wherein the UE determines a size of a first payload for the first ACK information related to the first TB to be identical to a size of a second payload for the second ACK information related to the second TB.

2. The method of claim 1 , wherein the downlink control information comprises first information for each TB indicating whether a corresponding TB corresponds to TB level initial transmission or CBG level retransmission.

3. The method of claim 1 ,

wherein based on a configuration of a bundling of the acknowledgement information corresponding to the two TBs, the CBG level acknowledgement information is configured for bundling the first ACK information for each CBG included in the first TB and the second ACK information for each CBG included in the second TB, respectively.

4. The method of claim 3 ,

wherein based on the configuration of the bundling of the acknowledgement information corresponding to the two TBs, the downlink control information comprises a single Code Block Group Transmission Indicator (CBGTI) commonly indicating one or more CBG pairs to be transmitted among a plurality of CBG pairs to which the acknowledgement information bundled respectively.

5. The method of claim 4 , wherein the single CBGTI has a bit size related to a maximum number of CBGs for a single TB.

6. The method of claim 4 ,

wherein based on the configuration of the bundling of the acknowledgement information corresponding to the two TBs, the method further comprises:

in response to the CBG level acknowledgement information, receiving additional downlink control information; and

receiving additional downlink data comprising the one or more CBG pairs indicated by the CBGTI based on the assumption that only the one or more CBG pairs indicated by the CBGTI are actually transmitted.

7. The method of claim 1 , wherein the UE determines the size of the first payload and the size of the second payload based on a maximum number of CBGs per 1 TB.

8. The method of claim 7 , wherein the UE receives information regarding the maximum number of CBGs per 1 TB from a base station.

9. The method of claim 7 , wherein based on the maximum number of CBGs per 1 TB being greater than an actual number of CBGs in the first TB, the UE determines the first ACK information related to the first TB by mapping a NACK value to one or more remaining bits in the first payload for the first ACK information.

10. The method of claim 1 , wherein the UE determines the size of the first payload independently from an actual number of CBGs in the first TB.

11. The method of claim 1 , wherein the UE determines a total size of the CBG level ACK information regarding the first payload for the first ACK information and the second payload for the second ACK information in consideration of a number of component carriers (CCs) configured in the UE for carrier aggregation.

12. The method of claim 1 , wherein the UE determines a total size of the CBG level ACK information regarding the first payload for the first ACK information and the second payload for the second ACK information in consideration of a total number of CBGs that can be scheduled during a specific time window.

13. The method of claim 12 , wherein the UE determines the total number of CBGs in consideration of a maximum number of CBGs related to second downlink data in addition to a maximum number of CBGs related to the first downlink data.

14. The method of claim 13 , wherein the first downlink data is related to a first time resource and the second downlink data is related to a second time resource different from the first time resource.

15. The method of claim 12 , wherein the specific time window is related to a same hybrid automatic repeat request (HARQ)-ACK timing.

16. The method of claim 1 , wherein the UE determines a number of CBGs in the first TB and a number of CBGs in the second TB, respectively.

17. A method for receiving acknowledgement information by a base station (BS) in a wireless communication system, the method comprising:

transmitting, to a user equipment (UE), downlink control information scheduling 2 transmission blocks (TBs), each of the TBs including one or more code block groups (CBGs);

transmitting, to the UE, first downlink data related to the 2 TBs based on the downlink control information; and

receiving, from the UE, CBG level acknowledgement information regarding (i) first ACK information related to a first TB in the first downlink data and (ii) second ACK information related to a second TB in the first downlink data,

wherein a size of a first payload for the first ACK information related to the first TB is determined to be identical to a size of a second payload for the second ACK information related to the second TB.

18. A user equipment (UE) comprising:

a transmitter;

a receiver; and

a processor operably connected to the transmitter and the receiver,

wherein the processor is configured to:

receive downlink control information scheduling 2 transmission blocks (TBs), each of the TBs comprising one or more code block groups (CBGs);

receive first downlink data related to the 2 TBs based on the downlink control information; and

transmit CBG level acknowledgement (ACK) information regarding (i) first ACK information related to a first TB in the received first downlink data and (ii) second ACK information related to a second TB in the received first downlink data,

wherein the processor is further configured to determine a size of a first payload for the first ACK information related to the first TB to be identical to a size of a second payload for the second ACK information related to the second TB.

19. A base station (BS) comprising:

a transmitter;

a receiver; and

a processor operably connected to the transmitter and the receiver,

wherein the processor is configured to:

transmit, to a user equipment (UE), downlink control information scheduling 2 transmission blocks (TBs), each of the TBs including one or more code block groups (CBGs);

transmit, to the UE, first downlink data related to the 2 TBs based on the downlink control information; and

receive, from the UE, CBG level acknowledgement information regarding (i) first ACK information related to a first TB in the first downlink data and (ii) second ACK information related to a second TB in the first downlink data,

wherein a size of a first payload for the first ACK information related to the first TB is determined to be identical to a size of a second payload for the second ACK information related to the second TB.

20. A non-transitory processor readable medium having recorded thereon program codes for executing the method of claim 1 .