Acknowledgment feedback techniques in wireless communications
Methods, systems, and devices for wireless communications are described that enable efficient group-based acknowledgment feedback reporting. Techniques are provided for feedback for a number of different downlink transmissions to be reported by a user equipment (UE) using transport block level feedback, code block group level feedback, or combinations thereof. Acknowledgment feedback may be provided in one or more group-based or enhanced dynamic feedback reports, a one-shot feedback report, or any combinations thereof.
1. A method for wireless communications at a user equipment (UE), comprising:
receiving, from a network device, configuration information for group-based acknowledgment feedback for one or more of a first downlink transmission group or a second downlink transmission group;
receiving downlink control information from the network device, wherein the downlink control information schedules a first uplink transmission in which acknowledgment feedback for one or more of the first downlink transmission group or the second downlink transmission group is to be multiplexed with uplink data in the first uplink transmission, and wherein the downlink control information provides a first downlink assignment indicator value;
determining, based at least in part on the configuration information for the group-based acknowledgment feedback and the first downlink assignment indicator value, an acknowledgment feedback format for an acknowledgment feedback report associated with the first downlink transmission group, the second downlink transmission group, or both;
formatting the acknowledgment feedback report with an acknowledgment feedback codebook associated with a fixed downlink transmission group associated with the first downlink assignment indicator value; and
transmitting the acknowledgment feedback report to the network device in the first uplink transmission.
2. The method of claim 1 , wherein the first downlink assignment indicator value indicates a number of feedback acknowledgments to be reported in the acknowledgment feedback report, and the first downlink assignment indicator value is a single downlink assignment indicator value that is associated with one of the first downlink transmission group or the second downlink transmission group.
3. The method of claim 2 , wherein:
the first downlink transmission group comprises a group g and the second downlink transmission group comprises a group (g+1)mod2; and
the first downlink assignment indicator value is associated with the group g and the first uplink transmission does not include hybrid automatic repeat request acknowledgment (HARQ-ACK) information for the group (g+1)mod2.
4. The method of claim 1 , further comprising:
determining which of the first downlink transmission group or the second downlink transmission group is scheduled to have the acknowledgment feedback provided in the first uplink transmission, and wherein the first downlink assignment indicator value is associated with the determined downlink transmission group.
5. The method of claim 1 , wherein a predetermined value of a second downlink assignment indicator value indicates that acknowledgment feedback information of the second downlink transmission group is not to be included in the acknowledgment feedback report.
6. The method of claim 5 , wherein the predetermined value of the second downlink assignment indicator value is four.
7. The method of claim 1 , wherein
the configuration information further indicates that the first downlink assignment indicator value is a single downlink assignment indicator value provided in the downlink control information.
8. The method of claim 1 , further comprising:
determining, based at least in part on identifying an error case, to refrain from multiplexing the acknowledgment feedback report in the first uplink transmission, refrain from transmitting the first uplink transmission entirely, or transmit the acknowledgment feedback report with preconfigured feedback information.
9. The method of claim 1 , wherein the first downlink transmission group comprises the fixed downlink transmission group associated with the first downlink assignment indicator value.
10. The method of claim 1 , wherein the first downlink assignment indicator value comprises a total downlink assignment indicator value.
11. An apparatus for wireless communications at a user equipment (UE), comprising:
means for receiving, from a network device, configuration information for group-based acknowledgment feedback for one or more of a first downlink transmission group or a second downlink transmission group;
means for receiving downlink control information from the network device, wherein the downlink control information schedules a first uplink transmission in which acknowledgment feedback for one or more of the first downlink transmission group or the second downlink transmission group is to be multiplexed with uplink data in the first uplink transmission, wherein the downlink control information provides a first downlink assignment indicator value;
means for determining, based at least in part on the configuration information for the group-based acknowledgment feedback and the first downlink assignment indicator value, an acknowledgment feedback format for an acknowledgment feedback report associated with at the first downlink transmission group, the second downlink transmission group, or both;
means for formatting the acknowledgment feedback report with an acknowledgment feedback codebook associated with a fixed downlink transmission group associated with the first downlink assignment indicator value; and
means for transmitting the acknowledgment feedback report to the network device in the first uplink transmission.
12. The apparatus of claim 11 , wherein the first downlink assignment indicator value indicates a number of feedback acknowledgments to be reported in the acknowledgment feedback report, and the first downlink assignment indicator value is a single downlink assignment indicator value that is associated with one of the first downlink transmission group or the second downlink transmission group.
13. The apparatus of claim 12 , wherein:
the first downlink transmission group comprises a group g and the second downlink transmission group comprises a group (g+1)mod2; and
the first downlink assignment indicator value is associated with the group g and the first uplink transmission does not include hybrid automatic repeat request acknowledgment (HARQ-ACK) for the group (g+1)mod2.
14. The apparatus of claim 11 , further comprising:
means for determining which of the first downlink transmission group or the second downlink transmission group is scheduled to have the acknowledgment feedback provided in the first uplink transmission, and wherein the first downlink assignment indicator value is associated with the determined downlink transmission group.
15. The apparatus of claim 11 , wherein a predetermined value of a second downlink assignment indicator value indicates that acknowledgment feedback information of the second downlink transmission group is not to be included in the acknowledgment feedback report.
16. The apparatus of claim 15 , wherein the predetermined value of the second downlink assignment indicator value is four.
17. The apparatus of claim 11 , wherein
the configuration information further indicates that the first downlink assignment indicator value is a single downlink assignment indicator value provided in the downlink control information.
18. The apparatus of claim 11 , further comprising:
means for determining, based at least in part on identifying an error case, to refrain from multiplexing the acknowledgment feedback report in the first uplink transmission, refrain from transmitting the first uplink transmission entirely, or transmit the acknowledgment feedback report with preconfigured feedback information.
19. The apparatus of claim 11 , wherein the first downlink transmission group comprises the fixed downlink transmission group associated with the first downlink assignment indicator value.
20. The apparatus of claim 11 , wherein the first downlink assignment indicator value comprises a total downlink assignment indicator.
21. An apparatus for wireless communications at a user equipment (UE), comprising:
one or more processors,
one or more memories coupled with the one or more processors; and
instructions stored in the one or more memories and executable by the one or more processors to cause the apparatus to:
receive, from a network device, configuration information for group-based acknowledgment feedback for one or more of a first downlink transmission group or a second downlink transmission group;
receive downlink control information from the network device that schedules a first uplink transmission in which acknowledgment feedback for one or more of the first downlink transmission group or the second downlink transmission group is to be multiplexed with uplink data in the first uplink transmission, wherein the downlink control information provides a first downlink assignment indicator value;
determine, based at least in part on the configuration information for the group-based acknowledgment feedback and the first downlink assignment indicator value, an acknowledgment feedback format for an acknowledgment feedback report associated with at least one of the first downlink transmission group or the second downlink transmission group;
format the acknowledgment feedback report with an acknowledgment feedback codebook associated with a fixed downlink transmission group associated with the first downlink assignment indicator value; and
transmit the acknowledgment feedback report to the network device in the first uplink transmission.
22. A non-transitory computer-readable medium storing code for wireless communications at a user equipment (UE), the code comprising instructions executable by one or more processors to:
receive, from a network device, configuration information for group-based acknowledgment feedback for one or more of a first downlink transmission group or a second downlink transmission group;
receive downlink control information from the network device, wherein the downlink control information schedules a first uplink transmission in which acknowledgment feedback for one or more of the first downlink transmission group or the second downlink transmission group is to be multiplexed with uplink data in the first uplink transmission, wherein the downlink control information provides a first downlink assignment indicator value;
determine, based at least in part on the configuration information for the group-based acknowledgment feedback and the first downlink assignment indicator value, an acknowledgment feedback format for an acknowledgment feedback report associated with at least one of the first downlink transmission group or the second downlink transmission group;
format the acknowledgment feedback report with an acknowledgment feedback codebook associated with a fixed downlink transmission group associated with the first downlink assignment indicator value; and
transmit the acknowledgment feedback report to the network device in the first uplink transmission.