CBG-based retransmission

1. A user equipment (UE), comprising:

at least one memory; and

at least one processor coupled with the at least one memory and configured to cause the UE to:

receive a first number of transport blocks, wherein each transport block of the first number of transport blocks includes a second number of code block groups;

decode the first number of transport blocks; and

transmit a signaling comprising a first field corresponding to the first number of transport blocks and a second field corresponding to the second number of code block groups included in a third number of transport blocks, wherein the third number of transport blocks are incorrectly decoded transport blocks in the first number of transport blocks, and wherein the first field includes a first number of new data indicator bits, and each new data indicator bit corresponds to one of the first number of transport blocks.

2. The UE of claim 1 , wherein the first field includes a first number of bits indicating decoding results of the first number of transport blocks, and

a decoding result corresponding to a transport block is an ACKNOWLEDGEMENT in response to the transport block being correctly decoded or a NEGTIVE ACKNOWLEDGEMENT in response to the transport block being incorrectly decoded.

3. The UE of claim 1 , wherein the second field includes a second number of bits indicating decoding results of the code block groups included in the third number of transport blocks, and

a decoding result corresponding to a code block group is an ACKNOWLEDGEMENT in response to all of code blocks of the code block group being correctly decoded or a NEGTIVE ACKNOWLEDGEMENT in response to at least one code block of the code block group being incorrectly decoded.

4. The UE of claim 1 , wherein the second field includes a second number of bits, and

each bit corresponds to a set of code block groups with same code block group index included in the third number of transport blocks, for indicating ACKNOWLEDGEMENT in response to the set of code block groups being correctly decoded or NEGTIVE ACKNOWLEDGEMENT in response to at least one code block group of the set of code block groups being incorrectly decoded.

5. The UE of claim 1 , wherein a first number of transport blocks is scheduled by a single downlink control information format, and

the first number is indicated by the downlink control information format.

6. The UE of claim 1 , wherein the maximum number of transport blocks scheduled by a single downlink control information format is configured by radio resource control signaling.

7. The UE of claim 6 , wherein the downlink control information format includes a third field indicating the first number, and

a length of the third field is determined based on a configured maximum number of transport blocks scheduled by a single downlink control information format.

8. The UE of claim 1 , wherein the first field includes a first number of bits, and each bit indicates whether one of the first number of transport blocks is to be retransmitted.

9. The UE of claim 1 , wherein a length of the first field equals to a maximum number of transport blocks scheduled by a single downlink control information format.

10. The UE of claim 1 , wherein the second field includes a second number of bits, and

each bit corresponds to a set of code block groups with same code block group index included in the third number of transport blocks for indicating whether the set of code block groups is to be retransmitted.

11. The UE of claim 1 , wherein the second number is configured by radio resource control signaling.

12. A method performed by a user equipment (UE), the method comprising:

receiving a first number of transport blocks wherein each transport block of the first number of transport blocks includes a second number of code block groups;

decoding the first number of transport blocks; and

transmitting a signaling comprising a first field corresponding to the first number of transport blocks and a second field corresponding to the second number of code block groups included in a third number of transport blocks, wherein the third number of transport blocks are incorrectly decoded transport blocks in the first number of transport blocks, and wherein the first field includes a first number of new data indicator bits, and each new data indicator bit corresponds to one of the first number of transport blocks.

13. The method of claim 12 , wherein the first field includes a first number of bits indicating decoding results of the first number of transport blocks, and

a decoding result corresponding to a transport block is an ACKNOWLEDGEMENT in response to the transport block being correctly decoded or a NEGTIVE ACKNOWLEDGEMENT in response to the transport block being incorrectly decoded.

14. The method of claim 12 , wherein the second field includes a second number of bits indicating decoding results of the code block groups included in the third number of transport blocks, and

a decoding result corresponding to a code block group is an ACKNOWLEDGEMENT in response to all of code blocks of the code block group being correctly decoded or a NEGTIVE ACKNOWLEDGEMENT in response to at least one code block of the code block group being incorrectly decoded.

15. The method of claim 12 , wherein the second field includes a second number of bits, and

each bit corresponds to a set of code block groups with same code block group index included in the third number of transport blocks, for indicating ACKNOWLEDGEMENT in response to the set of code block groups being correctly decoded or NEGTIVE ACKNOWLEDGEMENT in response to at least one code block group of the set of code block groups being incorrectly decoded.

16. The method of claim 12 , wherein the first number of transport blocks is scheduled by a single downlink control information format, and

the first number is indicated by the downlink control information format.

17. The method of claim 12 , wherein the maximum number of transport blocks scheduled by a single downlink control information format is configured by radio resource control signaling.

18. The method of claim 17 , wherein the downlink control information format includes a third field indicating the first number, and

a length of the third field is determined based on a configured maximum number of transport blocks scheduled by a single downlink control information format.

19. The method of claim 12 , wherein the second field includes a second number of bits, and

each bit corresponds to a set of code block groups with same code block group index included in the third number of transport blocks for indicating whether the set of code block groups is to be retransmitted.