Acknowledgement feedback for multi-component carrier scheduling

1. A method for wireless communication at a user equipment (UE), comprising:

receiving a downlink control information message scheduling a first transmission on a first downlink data channel of a first component carrier and a second transmission on a second downlink data channel of a second component carrier, the received downlink control information message providing an indication of a timing offset for acknowledgement information associated with the first transmission and the second transmission, wherein the first component carrier is different from the second component carrier;

selecting, based at least in part on a selection rule, one of a first slot or a second slot, the first slot associated with the first transmission on the first downlink data channel and the second slot associated with the second transmission on the second downlink data channel;

determining, based at least in part on the indicated timing offset and the selected one of the first slot or the second slot, a third slot to use to transmit the acknowledgement information; and

transmitting, during the determined third slot using the first component carrier, the acknowledgement information associated with the first transmission and the second transmission on a control channel.

2. The method of claim 1 , wherein the first component carrier corresponds to a first subcarrier spacing and the second component carrier corresponds to a second subcarrier spacing different than the first subcarrier spacing.

3. The method of claim 2 , wherein determining the third slot to use to transmit the acknowledgement information is based at least in part on the first subcarrier spacing or the second subcarrier spacing, or both.

4. The method of claim 1 , wherein the third slot comprises a slot to transmit the acknowledgement information associated with the first transmission and the second transmission.

5. The method of claim 1 , further comprising:

identifying a first indicator of a set of indicators in the received downlink control information message, the first indicator comprising a first time domain resource allocation field for the first downlink data channel associated with the first component carrier; and

identifying a second indicator of the set of indicators in the received downlink control information message, the second indicator comprising a second time domain resource allocation field for the second downlink data channel associated with the second component carrier, wherein determining the third slot to use to transmit the acknowledgement information is based at least in part on the first time domain resource allocation field and the second time domain resource allocation field.

6. The method of claim 1 , further comprising:

identifying an indicator of a set of indicators in the received downlink control information message, the indicator comprising a time domain resource allocation field for both the first downlink data channel associated with the first component carrier and the second downlink data channel associated with the second component carrier,

wherein determining the third slot to use to transmit the acknowledgement information is based at least in part on the time domain resource allocation field.

7. The method of claim 1 , further comprising:

determining, based at least in part on the received downlink control information message, a beginning slot of the first downlink data channel associated with the first component carrier, an ending slot of the first downlink data channel associated with the first component carrier, or a duration of the first downlink data channel associated with the first component carrier, or a combination thereof,

wherein determining the third slot to use to transmit the acknowledgement information is based at least in part on the beginning slot of the first downlink data channel, the ending slot of the first downlink data channel, or the duration of the first downlink data channel, or a combination thereof.

8. The method of claim 7 , further comprising:

determining, based at least in part on the received downlink control information message, a beginning slot of the second downlink data channel associated with the second component carrier, an ending slot of the second downlink data channel associated with the second component carrier, or a duration of the second downlink data channel associated with the second component carrier, or a combination thereof,

wherein determining the third slot to use to transmit the acknowledgement information is based at least in part on the beginning slot of the second downlink data channel, the ending slot of the second downlink data channel, or the duration of the second downlink data channel, or a combination thereof.

9. The method of claim 8 , further comprising:

scaling one or more of the beginning slot of the first downlink data channel, the ending slot of the first downlink data channel, the duration of the first downlink data channel, the beginning slot of the second downlink data channel, the ending slot of the second downlink data channel, or the duration of the second downlink data channel, or a combination thereof.

10. The method of claim 1 , wherein transmitting the acknowledgement information associated with the first transmission and the second transmission on the control channel comprises:

excluding, based at last in part on an absence of the timing offset in a set of timing offsets, feedback associated with the first downlink data channel or the second downlink data channel from the acknowledgement information associated with the first transmission and the second transmission on the control channel.

11. The method of claim 1 , wherein the selection rule comprises selecting one of the first slot or the second slot based at least in part on the first slot occurring before the second slot.

12. The method of claim 1 , wherein the selection rule comprises selecting one of the first slot or the second slot based at least in part on the first slot occurring after the second slot.

13. The method of claim 1 , wherein the selection rule comprises selecting one of the first slot or the second slot based at least in part on a first component carrier index associated with the first component carrier and a second component carrier index associated with the second component carrier.

14. A method for wireless communication at a base station, comprising:

transmitting a downlink control information message scheduling a first transmission on a first downlink data channel of a first component carrier and a second transmission on a second downlink data channel of a second component carrier, the transmitted downlink control information message providing an indication of a timing offset for acknowledgement information associated with the first transmission and the second transmission, a first slot associated with the first transmission on the first downlink data channel and a second slot associated with the second transmission on the second downlink data channel, wherein the first component carrier is different from the second component carrier;

determining, based at least in part on the timing offset and one of the first slot or the second slot, a third slot for receiving the acknowledgement information; and

receiving, during the third slot of the first component carrier, the acknowledgement information associated with the first transmission and the second transmission on a control channel.

15. The method of claim 14 , wherein the first component carrier corresponds to a first subcarrier spacing and the second component carrier corresponds to a second subcarrier spacing different than the first subcarrier spacing.

16. The method of claim 15 , wherein receiving, during the third slot, the acknowledgement information is based at least in part on the first subcarrier spacing or the second subcarrier spacing, or both.

17. The method of claim 14 , wherein the third slot comprises a slot to receive the acknowledgement information associated with the first transmission and the second transmission.

18. The method of claim 14 , further comprising:

assigning an indicator of a set of indicator in the transmitted downlink control information message, the indicator comprising a time domain resource allocation field for both the first downlink data channel associated with the first component carrier and the second downlink data channel associated with the second component carrier,

wherein the third slot to use to receive the acknowledgement information is based at least in part on the time domain resource allocation field.

19. The method of claim 14 , further comprising:

assigning a first indicator of a set of indicators in the transmitted downlink control information message, the first indicator comprising a first time domain resource allocation field for the first downlink data channel associated with the first component carrier; and

assigning a second indicator of the set of indicators in the transmitted downlink control information message, the second indicator comprising a second time domain resource allocation field for the second downlink data channel associated with the second component carrier, wherein the third slot to use to receive the acknowledgement information is based at least in part on the first time domain resource allocation field and the second time domain resource allocation field.

20. The method of claim 14 , wherein the acknowledgement information excludes feedback associated with the first downlink data channel or the second downlink data channel based at least in part on an absence of the timing offset in a set of timing offsets.

21. An apparatus for wireless communication, comprising:

a processor,

memory coupled with the processor; and

instructions stored in the memory and executable by the processor to cause the apparatus to:

receive a downlink control information message scheduling a first transmission on a first downlink data channel of a first component carrier and a second transmission on a second downlink data channel of a second component carrier, the received downlink control information message providing an indication of a timing offset for acknowledgement information associated with the first transmission and the second transmission, wherein the first component carrier is different from the second component carrier;

select, based at least in part on a selection rule, one of a first slot or a second slot, the first slot associated with the first transmission on the first downlink data channel and the second slot associated with the second transmission on the second downlink data channel;

determine, based at least in part on the indicated timing offset and the selected one of the first slot or the second slot, a third slot to use to transmit the acknowledgement information; and

transmit, during the determined third slot using the first component carrier, the acknowledgement information associated with the first transmission and the second transmission on a control channel.

22. The apparatus of claim 21 , wherein the first component carrier corresponds to a first subcarrier spacing and the second component carrier corresponds to a second subcarrier spacing different than the first subcarrier spacing, wherein determining the third slot to use to transmit the acknowledgement information is based at least in part on the first subcarrier spacing or the second subcarrier spacing, or both.

23. The apparatus of claim 21 , wherein the instructions are further executable by the processor to cause the apparatus to:

identify a first indicator of a set of indicators in the received downlink control information message, the first indicator comprising a first time domain resource allocation field for the first downlink data channel associated with the first component carrier; and

identify a second indicator of the set of indicators in the received downlink control information message, the second indicator comprising a second time domain resource allocation field for the second downlink data channel associated with the second component carrier, wherein determining the third slot to use to transmit the acknowledgement information is based at least in part on the first time domain resource allocation field and the second time domain resource allocation field.

24. The apparatus of claim 21 , wherein the instructions are further executable by the processor to cause the apparatus to:

identify an indicator of a set of indicators in the received downlink control information message, the indicator comprising a time domain resource allocation field for both the first downlink data channel associated with the first component carrier and the second downlink data channel associated with the second component carrier,

wherein determining the third slot to use to transmit the acknowledgement information is based at least in part on the time domain resource allocation field.

25. An apparatus for wireless communication, comprising:

a processor,

memory coupled with the processor; and

instructions stored in the memory and executable by the processor to cause the apparatus to:

transmit a downlink control information message scheduling a first transmission on a first downlink data channel of a first component carrier and a second transmission on a second downlink data channel of a second component carrier, the transmitted downlink control information message providing an indication of a timing offset for acknowledgement information associated with the first transmission and the second transmission, a first slot associated with the first transmission on the first downlink data channel and a second slot associated with the second transmission on the second downlink data channel, wherein the first component carrier is different from the second component carrier; and

receive, during a third slot of the first component carrier, the acknowledgement information associated with the first transmission and the second transmission on a control channel.

26. The apparatus of claim 25 , wherein the first component carrier corresponds to a first subcarrier spacing and the second component carrier corresponds to a second subcarrier spacing different than the first subcarrier spacing, wherein receiving, during the third slot, the acknowledgement information is based at least in part on the first subcarrier spacing or the second subcarrier spacing, or both.

27. The apparatus of claim 25 , wherein the third slot comprises a slot to receive the acknowledgement information associated with the first transmission and the second transmission.

28. The apparatus of claim 25 , wherein the instructions are further executable by the processor to cause the apparatus to:

assign an indicator of a set of indicator in the transmitted downlink control information message, the indicator comprising a time domain resource allocation field for both the first downlink data channel associated with the first component carrier and the second downlink data channel associated with the second component carrier,

wherein the third slot to use to receive the acknowledgement information is based at least in part on the time domain resource allocation field.

29. The apparatus of claim 25 , wherein the instructions are further executable by the processor to cause the apparatus to:

assign a first indicator of a set of indicators in the transmitted downlink control information message, the first indicator comprising a first time domain resource allocation field for the first downlink data channel associated with the first component carrier; and

assign a second indicator of the set of indicators in the transmitted downlink control information message, the second indicator comprising a second time domain resource allocation field for the second downlink data channel associated with the second component carrier, wherein the third slot to use to receive the acknowledgement information is based at least in part on the first time domain resource allocation field and the second time domain resource allocation field.

30. The apparatus of claim 25 , wherein the acknowledgement information excludes feedback associated with the first downlink data channel or the second downlink data channel based at least in part on an absence of the timing offset in a set of timing offsets.