Support of enhanced dynamic codebook with different DCI formats
Systems and methods are disclosed herein for supporting enhanced dynamic codebook Hybrid Automatic Repeat Request (HARQ) feedback. In one embodiment, a method performed by a wireless communication device comprises receiving, from a base station, downlink control information (DCI) in accordance with a fallback DCI format. The DCI comprises downlink scheduling information that indicates downlink resources allocated for a downlink data channel transmission to the wireless communication device. The fallback DCI format does not include an explicit indication of an identifier of a downlink data channel group of the downlink data channel transmission. The method further comprises attempting to receive and decode the transmission and determining a downlink data channel group for the transmission based on the DCI. The method further comprises generating a dynamic codebook HARQ feedback for the downlink data channel group comprising HARQ feedback for the transmission and transmitting the dynamic codebook HARQ feedback to the base station.
1. A method performed by a wireless communication device for dynamic codebook Hybrid Automatic Repeat Request (HARQ) feedback, the method comprising:
receiving, from a base station, a downlink control information (DCI) in accordance with a fallback DCI format, wherein:
the DCI comprises downlink scheduling information that indicates downlink resources allocated for a downlink data channel transmission to the wireless communication device; and
the fallback DCI format does not include an explicit indication of a downlink data channel group identifier of a downlink data channel group of the downlink data channel transmission;
attempting to receive and decode the downlink data channel transmission in accordance with the DCI;
determining a downlink data channel group for the downlink data channel transmission based on the DCI;
generating a dynamic codebook HARQ feedback for the downlink data channel group, the dynamic codebook HARQ feedback comprising HARQ feedback for the downlink data channel transmission;
transmitting the dynamic codebook HARQ feedback to the base station; and
receiving, from the base station, a request for dynamic codebook HARQ feedback for one or more downlink data channel groups comprising the determined downlink data channel group of the downlink data channel transmission,
wherein receiving the request comprises receiving second DCI comprising information that indicates that dynamic codebook HARQ feedback is requested for the one or more downlink data channel groups, wherein the second DCI is in accordance with an uplink DCI format, and wherein the uplink DCI format is such that the second DCI repurposes one or more downlink assignment index (DAI) fields as an indication of the one or more downlink data channel groups for which dynamic codebook HARQ feedback is requested.
2. The method of claim 1 , wherein determining the downlink data channel group for the downlink data channel transmission comprises determining the downlink data channel group based on a predefined or preconfigured mapping.
3. The method of claim 2 , wherein the mapping is based on:
time,
frequency,
Radio Network Temporary Identifier (RNTI),
Demodulation Reference Signal (DMRS) sequence, or
a search space in which the DCI is received.
4. The method of claim 1 , wherein the uplink DCI format is such that the second DCI comprises downlink assignment indices that reflect a latest total downlink assignment index (T-DAI) for each of the one or more downlink data channel groups for which dynamic codebook HARQ feedback is requested.
5. The method of claim 1 , wherein the uplink DCI format is such that the second DCI comprises information that reflects a status of a latest total downlink assignment index (T-DAI) of a respective downlink channel group, wherein the uplink DCI format is such that the second DCI comprises a downlink assignment index (DAI) that reflects a latest total DAI (T-DAI) of a latest scheduled or transmitted downlink channel group that is to be reported.
6. A wireless communication device for dynamic codebook Hybrid Automatic Repeat Request (HARQ) feedback, the wireless communication device comprising:
one or more transmitters;
one or more receivers; and
processing circuitry associated with the one or more transmitters and the one or more receivers, the processing circuitry configured to cause the wireless communication device to: receive, from a base station, a downlink control information (DCI) in accordance with a fallback DCI format, wherein:
the DCI comprises downlink scheduling information that indicates downlink resources allocated for a downlink data channel transmission to the wireless communication device; and
the fallback DCI format does not include an explicit indication of a downlink data channel group identifier of a downlink data channel group of the downlink data channel transmission;
attempt to receive and decode the downlink data channel transmission in accordance with the DCI;
determine a downlink data channel group for the downlink data channel transmission based on the DCI;
generate a dynamic codebook HARQ feedback for the downlink data channel group, the dynamic codebook HARQ feedback comprising HARQ feedback for the downlink data channel transmission;
transmit the dynamic codebook HARQ feedback to the base station; and
receive, from the base station, a request for dynamic codebook HARQ feedback for one or more downlink data channel groups comprising the determined downlink data channel group of the downlink data channel transmission,
wherein receiving the request comprises receiving second DCI comprising information that indicates that dynamic codebook HARQ feedback is requested for the one or more downlink data channel groups, wherein the second DCI is in accordance with an uplink DCI format, and wherein the uplink DCI format is such that the second DCI repurposes one or more downlink assignment index (DAI) fields as an indication of the one or more downlink data channel groups for which dynamic codebook HARQ feedback is requested.
7. A method performed by a base station for dynamic codebook Hybrid Automatic Repeat Request (HARQ) feedback, the method comprising:
determining a downlink data channel group for a downlink data channel transmission;
generating downlink control information (DCI) that schedules the downlink data channel transmission to a wireless communication device, the DCI being in accordance with a fallback DCI format that does not include an explicit indication of a downlink data channel group identifier of the downlink data channel group of the downlink data channel transmission;
transmitting or initiating transmission of the DCI to the wireless communication device; and
transmitting or initiating transmission of a request to the wireless communication device for dynamic codebook HARQ feedback for one or more downlink data channel groups comprising the determined downlink data channel group of the downlink data channel transmission; and
receiving, from the wireless communication device, dynamic codebook HARQ feedback for the downlink data channel group, the dynamic codebook HARQ feedback comprising HARQ feedback for the downlink data channel transmission;
wherein transmitting or initiating transmission of the request comprises transmitting or initiating transmission of second DCI comprising information that indicates that dynamic codebook HARQ feedback is requested for the one or more downlink data channel groups, wherein the second DCI is in accordance with a DCI format that does not include downlink data channel transmission group identifiers for one or more downlink data channel groups for which dynamic codebook HARQ feedback is requested, wherein the second DCI is in accordance with an uplink DCI format, and wherein the uplink DCI format is such that the second DCI repurposes one or more downlink assignment index (DAI) fields as an indication of the one or more downlink data channel groups for which dynamic codebook HARQ feedback is requested.
8. The method of claim 7 , wherein the uplink DCI format is such that the second DCI comprises downlink assignment indices that reflect a latest total downlink assignment index (T-DAI) for each of the one or more downlink data channel groups for which dynamic codebook HARQ feedback is requested.
9. The method of claim 7 , wherein the uplink DCI format is such that the second DCI comprises information that reflects a status of a latest total downlink assignment index (T-DAI) of a respective downlink channel group.
10. The method of claim 7 , wherein the uplink DCI format is such that the second DCI comprises a downlink assignment index (DAI) that reflects a latest total DAI (T-DAI) of a latest scheduled or transmitted downlink channel group that is to be reported, wherein the uplink DCI format is such that the second DCI comprises a downlink assignment index (DAI) that reflects a latest total DAI (T-DAI) of a latest transmitted downlink channel group that is to be reported.
11. A base station for dynamic codebook Hybrid Automatic Repeat Request (HARQ) feedback, the base station comprising processing circuitry configured to cause the base station to:
determine a downlink data channel group for a downlink data channel transmission;
generate downlink control information (DCI) that schedules the downlink data channel transmission to a wireless communication device, the DCI being in accordance with a fallback DCI format that does not include an explicit indication of a downlink data channel group identifier of the downlink data channel group of the downlink data channel transmission;
transmit or initiate transmission of the DCI to the wireless communication device; and
transmit or initiate transmission of a request to the wireless communication device for dynamic codebook HARQ feedback for one or more downlink data channel groups comprising the determined downlink data channel group of the downlink data channel transmission; and
receive, from the wireless communication device, dynamic codebook HARQ feedback for the downlink data channel group, the dynamic codebook HARQ feedback comprising HARQ feedback for the downlink data channel transmission,
wherein transmitting or initiating transmission of the request comprises transmitting or initiating transmission of second DCI comprising information that indicates that dynamic codebook HARQ feedback is requested for the one or more downlink data channel groups, wherein the second DCI is in accordance with a DCI format that does not include downlink data channel transmission group identifiers for one or more downlink data channel groups for which dynamic codebook HARQ feedback is requested, wherein the second DCI is in accordance with an uplink DCI format, and wherein the uplink DCI format is such that the second DCI repurposes one or more downlink assignment index (DAI) fields as an indication of the one or more downlink data channel groups for which dynamic codebook HARQ feedback is requested.