Techniques and apparatuses for using a downlink assignment index in new radio
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive an uplink grant that includes multiple total downlink assignment indexes (DAIs) corresponding to multiple DAI groups associated with the UE, wherein each of the multiple DAI groups is associated with a different set of component carriers used by the UE for carrier aggregation; and transmit (ACK/NACK) feedback for the multiple DAI groups based at least in part on the multiple total DAIs included in the uplink grant. In some aspects, a base station may determine multiple total DAIs corresponding to multiple DAI groups associated with a UE, wherein each of the multiple DAI groups is associated with a different set of component carriers used by the UE for carrier aggregation; and transmit the multiple total DAIs to the UE in an uplink grant. Numerous other aspects are provided.
1. A method of wireless communication performed by a base station, comprising:
determining multiple total downlink assignment indexes (DAIs) corresponding to multiple DAI groups associated with a user equipment (UE), wherein each of the multiple DAI groups is associated with a different set of component carriers used by the UE for carrier aggregation, wherein the multiple total DAIs include a first total DAI for a first set of component carriers used by the UE and a second total DAI for a second set of component carriers used by the UE, and wherein a different number of code block groups per transport block are used for the first set of component carriers and the second set of component carriers; and
transmitting the multiple total DAIs to the UE in an uplink grant.
2. The method of claim 1 , wherein the multiple total DAIs are indicated in different fields of the uplink grant.
3. The method of claim 1 , wherein the uplink grant is for an uplink data channel via which uplink control information is piggybacked.
4. The method of claim 1 , wherein the multiple total DAIs are transmitted based at least in part on a determination that the UE uses a different number of code block groups per transport block for the first set of component carriers and the second set of component carriers.
5. The method of claim 1 ,
wherein the first set of component carriers comprises one code block group per transport block, and
wherein the second set of component carriers comprises a number of code block groups, per transport block, that is greater than one.
6. The method of claim 1 , wherein the uplink grant is for a physical uplink shared channel (PUSCH).
7. The method of claim 1 , wherein a number of code block groups per transport block is configured dynamically or semi-statically.
8. The method of claim 1 , wherein a number of acknowledgement (ACK) or negative acknowledgement (NACK) (ACK/NACK) bits transmitted for a transport block is equal to a number of code block groups for the transport block.
9. A method of wireless communication performed by a user equipment (UE), comprising:
receiving an uplink grant that includes multiple total downlink assignment indexes (DAIs) corresponding to multiple DAI groups associated with the UE, wherein each of the multiple DAI groups is associated with a different set of component carriers used by the UE for carrier aggregation, wherein the multiple total DAIs include a first total DAI for a first set of component carriers used by the UE and a second total DAI for a second set of component carriers used by the UE, and wherein a different number of code block groups per transport block are used for the first set of component carriers and the second set of component carriers; and
transmitting acknowledgement (ACK) or negative acknowledgement (NACK) (ACK/NACK) feedback for the multiple DAI groups based at least in part on the multiple total DAIs included in the uplink grant.
10. The method of claim 9 , wherein the multiple total DAIs are indicated in different fields of the uplink grant.
11. The method of claim 9 , wherein the uplink grant is for an uplink data channel via which uplink control information is piggybacked.
12. The method of claim 9 , wherein the ACK/NACK feedback is transmitted via an uplink data channel.
13. The method of claim 9 ,
wherein the first set of component carriers comprises one code block group per transport block, and
wherein the second set of component carriers comprises a number of code block groups, per transport block, that is greater than one.
14. The method of claim 9 , wherein the uplink grant is for a physical uplink shared channel (PUSCH).
15. The method of claim 9 , wherein a number of code block groups per transport block is configured dynamically or semi-statically.
16. The method of claim 9 , wherein a number of ACK/NACK bits transmitted for a transport block is equal to a number of code block groups for the transport block.
17. A base station for wireless communication, comprising:
memory; and
one or more processors operatively coupled to the memory, the memory and the one or more processors configured to:
determine multiple total downlink assignment indexes (DAIs) corresponding to multiple DAI groups associated with a user equipment (UE), wherein each of the multiple DAI groups is associated with a different set of component carriers used by the UE for carrier aggregation, wherein the multiple total DAIs include a first total DAI for a first set of component carriers used by the UE and a second total DAI for a second set of component carriers used by the UE, and wherein a different number of code block groups per transport block are used for the first set of component carriers and the second set of component carriers; and
transmit the multiple total DAIs to the UE in an uplink grant.
18. The base station of claim 17 , wherein the multiple total DAIs are indicated in different fields of the uplink grant.
19. The base station of claim 17 , wherein the uplink grant is for an uplink data channel via which uplink control information is piggybacked.
20. The base station of claim 17 , wherein the multiple total DAIs are transmitted based at least in part on a determination that the UE uses a different number of code block groups per transport block for the first set of component carriers and the second set of component carriers.
21. The base station of claim 17 ,
wherein the first set of component carriers comprises one code block group per transport block, and
wherein the second set of component carriers comprises a number of code block groups, per transport block, that is greater than one.
22. A user equipment (UE) for wireless communication, comprising:
memory; and
one or more processors operatively coupled to the memory, the memory and the one or more processors configured to:
receive an uplink grant that includes multiple total downlink assignment indexes (DAIs) corresponding to multiple DAI groups associated with the UE, wherein each of the multiple DAI groups is associated with a different set of component carriers used by the UE for carrier aggregation, wherein the multiple total DAIs include a first total DAI for a first set of component carriers used by the UE and a second total DAI for a second set of component carriers used by the UE, and wherein a different number of code block groups per transport block are used for the first set of component carriers and the second set of component carriers; and
transmit acknowledgement (ACK) or negative acknowledgement (NACK) (ACK/NACK) feedback for the multiple DAI groups based at least in part on the multiple total DAIS included in the uplink grant.
23. The UE of claim 22 , wherein the multiple total DAIS are indicated in different fields of the uplink grant.
24. The UE of claim 22 , wherein the uplink grant is for an uplink data channel via which uplink control information is piggybacked.
25. The UE of claim 22 , wherein the ACK/NACK feedback is transmitted via an uplink data channel.
26. The UE of claim 22 ,
wherein the first set of component carriers comprises one code block group per transport block, and
wherein the second set of component carriers comprises a number of code block groups, per transport block, that is greater than one.