Joint HARQ timing and SLIV design for multi-PDSCH grant
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a grant that schedules multiple downlink communications, wherein the grant includes multiple start and length indicator values (SLIVs) that indicate respective time domain resource allocations (TDRAs) for the multiple downlink communications and a feedback timing indicator that indicates timing of uplink feedback communications for the multiple downlink communications. The UE may determine that there is a conflict between a timing of a first uplink feedback communication for a first downlink communication of the multiple downlink communications and a TDRA for a second downlink communication of the multiple downlink communications. The UE may adjust at least one of the TDRA for the second downlink communication or the timing of the first uplink feedback communication. Numerous other aspects are provided.
1. A user equipment (UE) for wireless communication, comprising:
a memory; and
one or more processors coupled to the memory, the one or more processors configured to:
receive a grant that schedules multiple downlink communications, wherein the grant includes multiple start and length indicator values (SLIVs) that indicate respective time domain resource allocations (TDRAs) for the multiple downlink communications and a feedback timing indicator that indicates timing of uplink feedback communications for the multiple downlink communications;
determine, based at least in part on the SLIVs and the feedback timing indicator, that there is a conflict between a timing of a first uplink feedback communication for at least one first downlink communication of the multiple downlink communications and a TDRA for a second downlink communication of the multiple downlink communications; and
adjust at least one of the TDRA for the second downlink communication or the timing of the first uplink feedback communication based at least in part on the timing of the first uplink feedback communication, to determine an adjusted TDRA for the second downlink communication and a gap for the first uplink feedback communication and on determining that there is a conflict between the timing of the first uplink feedback communication and the TDRA for the second downlink communication.
2. The UE of claim 1 , wherein the one or more processors are further configured to:
receive the second downlink communication in the adjusted TDRA for the second downlink communication; and
transmit the first uplink feedback communication in the gap.
3. The UE of claim 1 , wherein the gap includes a first subset of symbols for transmitting the first uplink feedback communication and a second subset of symbols preceding the first subset of symbols to provide a downlink to uplink switching gap, and wherein the adjusted TDRA includes a third subset of symbols preceding the second subset of symbols in the TDRA for the second downlink communication.
4. The UE of claim 3 , wherein the downlink to uplink switching gap is based at least in part on a capability of the UE, and the one or more processors are further configured to:
transmit, to a base station, an indication of the capability of the UE; and
receive, from the base station, a configuration of the downlink to uplink switching gap.
5. The UE of claim 3 , wherein the gap further includes a fourth subset of symbols subsequent to the first subset of symbols in the TDRA for the second downlink communication.
6. The UE of claim 3 , wherein the gap further includes a fourth subset of symbols subsequent to the first subset of symbols to provide an uplink to downlink switching gap, and wherein the adjusted TDRA further includes a fifth subset of symbols subsequent to the fourth subset of symbols in the TDRA for the second downlink communication.
7. The UE of claim 6 , wherein the uplink to downlink switching gap is based at least in part on a capability of the UE, and the one or more processors are further configured to:
transmit, to a base station, an indication of the capability of the UE; and
receive, from the base station, a configuration of the uplink to downlink switching gap.
8. The UE of claim 6 , wherein the one or more processors are further configured to:
receive a first transmission of the second downlink communication in the third subset of symbols; and
receive a second transmission of the second downlink communication in the fifth subset of symbols.
9. The UE of claim 1 , wherein the one or more processors, to adjust at least one of the TDRA for the second downlink communication or the timing of the first uplink feedback communication, are configured to:
adjust the timing of the first uplink feedback communication from a first subset of symbols in the TDRA for the second downlink communication to a second subset of symbols at an end of the TDRA for the second downlink communication; and
adjust the TDRA for the second downlink communication to determine an adjusted TDRA that excludes the second subset of symbols at the end of the TDRA for the second downlink communication.
10. The UE of claim 9 , wherein the second subset of symbols includes one or more symbols for transmitting the first uplink feedback communication and a downlink to uplink switching gap preceding the one or more symbols for transmitting the first uplink feedback communication, and wherein the adjusted TDRA includes symbols preceding the downlink to uplink switching gap in the TDRA for the second downlink communication.
11. A base station for wireless communication, comprising:
a memory; and
one or more processors coupled to the memory, the one or more processors configured to:
transmit, to a user equipment (UE), a grant that schedules multiple downlink communications, wherein the grant includes multiple start and length indicator values (SLIVs) that indicate respective time domain resource allocations (TDRAs) for the multiple downlink communications and a feedback timing indicator that indicates timing of uplink feedback communications for the multiple downlink communications;
determine, based at least in part on the SLIVs and the feedback timing indicator, that there is a conflict between a timing of a first uplink feedback communication for at least one first downlink communication of the multiple downlink communications and a TDRA for a second downlink communication of the multiple downlink communications; and
transmit, to the UE, the second downlink communication in an adjusted TDRA based at least in part on determining that there is a conflict between the timing of the first uplink feedback communication and the TDRA for the second downlink communication.
12. The base station of claim 11 , wherein the TDRA for the second downlink communication is adjusted based at least in part on the timing of the first uplink feedback communication, to determine the adjusted TDRA for the second downlink communication and a gap for the first uplink feedback communication.
13. The base station of claim 12 , wherein the one or more processors are further configured to:
receive the first uplink feedback communication in the gap.
14. The base station of claim 12 , wherein the gap includes a first subset of symbols for transmitting the first uplink feedback communication and a second subset of symbols preceding the first subset of symbols to provide a downlink to uplink switching gap, and wherein the adjusted TDRA includes a third subset of symbols preceding the second subset of symbols in the TDRA for the second downlink communication.
15. The base station of claim 14 , wherein the one or more processors are further configured to:
receive, from the UE, an indication of a capability of the UE;
determine, based at least in part on the capability of the UE, the downlink to uplink switching gap; and
transmit, to the UE, a configuration of the downlink to uplink switching gap.
16. The base station of claim 14 , wherein the gap further includes a fourth subset of symbols subsequent to the first subset of symbols in the TDRA for the second downlink communication.
17. The base station of claim 14 , wherein the gap further includes a fourth subset of symbols subsequent to the first subset of symbols to provide an uplink to downlink switching gap, and wherein the adjusted TDRA further includes a fifth subset of symbols subsequent to the fourth subset of symbols in the TDRA for the second downlink communication.
18. The base station of claim 17 , wherein the one or more processors are further configured to:
receive, from the UE, an indication of a capability of the UE;
determine, based at least in part on the capability of the UE, the uplink to downlink switching gap; and
transmit, to the UE, a configuration of the uplink to downlink switching gap.
19. The base station of claim 17 , wherein the one or more processors, to transmit the second downlink communication in the adjusted TDRA, are configured to:
transmit, to the UE, a first transmission of the second downlink communication in the third subset of symbols; and
transmit, to the UE, a second transmission of the second downlink communication in the fifth subset of symbols.
20. The base station of claim 11 , wherein the timing of the first uplink feedback communication is adjusted from a first subset of symbols in the TDRA for the second downlink communication to a second subset of symbols at an end of the TDRA for the second downlink communication, and wherein the adjusted TDRA excludes the second subset of symbols at the end of the TDRA for the second downlink communication.
21. The base station of claim 20 , wherein the second subset of symbols includes one or more symbols for transmitting the first uplink feedback communication and a downlink to uplink switching gap preceding the one or more symbols for transmitting the first uplink feedback communication, and wherein the adjusted TDRA includes symbols preceding the downlink to uplink switching gap in the TDRA for the second downlink communication.
22. A method of wireless communication performed by a user equipment (UE), comprising:
receiving a grant that schedules multiple downlink communications, wherein the grant includes multiple start and length indicator values (SLIVs) that indicate respective time domain resource allocations (TDRAs) for the multiple downlink communications and a feedback timing indicator that indicates timing of uplink feedback communications for the multiple downlink communications;
determining, based at least in part on the SLIVs and the feedback timing indicator, that there is a conflict between a timing of a first uplink feedback communication for at least one first downlink communication of the multiple downlink communications and a TDRA for a second downlink communication of the multiple downlink communications; and
adjusting at least one of the TDRA for the second downlink communication or the timing of the first uplink feedback communication based at least in part on the timing of the first uplink feedback communication, to determine an adjusted TDRA for the second downlink communication and a gap for the first uplink feedback communication and based at least in part on determining that there is a conflict between the timing of the first uplink feedback communication and the TDRA for the second downlink communication.
23. The method of claim 22 ,
wherein the gap includes a first subset of symbols for transmitting the first uplink feedback communication and a second subset of symbols preceding the first subset of symbols to provide a downlink to uplink switching gap, and wherein the adjusted TDRA includes a third subset of symbols preceding the second subset of symbols in the TDRA for the second downlink communication.
24. The method of claim 23 , wherein the gap further includes a fourth subset of symbols subsequent to the first subset of symbols in the TDRA for the second downlink communication.
25. The method of claim 23 , wherein the gap further includes a fourth subset of symbols subsequent to the first subset of symbols to provide an uplink to downlink switching gap, and wherein the adjusted TDRA further includes a fifth subset of symbols subsequent to the fourth subset of symbols in the TDRA for the second downlink communication.
26. The method of claim 22 , wherein adjusting at least one of the TDRA for the second downlink communication or the timing of the first uplink feedback communication comprises:
adjusting the timing of the first uplink feedback communication from a first subset of symbols in the TDRA for the second downlink communication to a second subset of symbols at an end of the TDRA for the second downlink communication, wherein the second subset of symbols includes one or more symbols for transmitting the first uplink feedback communication and a downlink to uplink switching gap preceding the one or more symbols for transmitting the first uplink feedback communication; and
adjusting the TDRA for the second downlink communication to determine an adjusted TDRA that excludes the second subset of symbols at the end of the TDRA for the second downlink communication, wherein the adjusted TDRA includes symbols preceding the downlink to uplink switching gap in the TDRA for the second downlink communication.
27. A method of wireless communication performed by a base station, comprising:
transmitting, to a user equipment (UE), a grant that schedules multiple downlink communications, wherein the grant includes multiple start and length indicator values (SLIVs) that indicate respective time domain resource allocations (TDRAs) for the multiple downlink communications and a feedback timing indicator that indicates timing of uplink feedback communications for the multiple downlink communications;
determining, based at least in part on the SLIVs and the feedback timing indicator, that there is a conflict between a timing of a first uplink feedback communication for at least one first downlink communication of the multiple downlink communications and a TDRA for a second downlink communication of the multiple downlink communications; and
transmitting, to the UE, the second downlink communication in an adjusted TDRA based at least in part on determining that there is a conflict between the timing of the first uplink feedback communication and the TDRA for the second downlink communication.
28. The method of claim 27 , wherein the TDRA for the second downlink communication is adjusted based at least in part on the timing of the first uplink feedback communication, to determine the adjusted TDRA for the second downlink communication and a gap for the first uplink feedback communication, wherein the gap includes a first subset of symbols for transmitting the first uplink feedback communication and a second subset of symbols preceding the first subset of symbols to provide a downlink to uplink switching gap, and wherein the adjusted TDRA includes a third subset of symbols preceding the second subset of symbols in the TDRA for the second downlink communication.
29. The method of claim 27 , wherein the timing of the first uplink feedback communication is adjusted from a first subset of symbols in the TDRA for the second downlink communication to a second subset of symbols at an end of the TDRA for the second downlink communication, and wherein the adjusted TDRA excludes the second subset of symbols at the end of the TDRA for the second downlink communication.