Resolving downlink control information ambiguity
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a wireless communication device may determine that a first set of downlink control information (DCI) formats is associated with a same DCI size as a second set of DCI formats, and perform a padding operation so that the first set of DCI formats and the second set of DCI formats are associated with different DCI sizes. Numerous other aspects are provided.
1. A wireless communication device, comprising:
a memory; and
one or more processors coupled to the memory, the one or more processors configured to:
determine that a first set of downlink control information (DCI) formats is associated with a same DCI size as a second set of DCI formats;
determine, based at least in part on determining that the first set of DCI formats is associated with the same DCI size as the second set of DCI formats, whether a third set of DCI formats is associated with a same DCI size as one or more of the first set of DCI formats or the second set of DCI formats;
determine, based at least in part on determining whether the third set of DCI formats is associated with the same DCI size as the one or more of the first set of DCI formats or the second set of DCI formats, whether a first DCI format of the third set of DCI formats and a second DCI format of the third set of DCI formats have a different DCI size; and
selectively perform, based at least in part on determining whether the first DCI format of the third set of DCI formats and the second DCI format of the third set of DCI formats have the different DCI size, an operation that aligns DCI sizes of the first DCI format and the second DCI format with each other.
2. The wireless communication device of claim 1 , wherein the first set of DCI formats and the second set of DCI formats are associated with different types of communications.
3. The wireless communication device of claim 1 , wherein the one or more processors are configured to:
perform a communication using one or more of the first set of DCI formats, the second set of DCI formats, or the third set of DCI formats based at least in part on selectively performing the operation.
4. The wireless communication device of claim 1 , wherein the first set of DCI formats is associated with a first search space and the second set of DCI formats is associated with a second search space.
5. The wireless communication device of claim 1 , wherein the one or more processors are configured to:
perform, based at least in part on determining whether the first set of DCI formats is associated with the same DCI size as the second set of DCI formats, a padding operation so that the first set of DCI formats is associated with a different DCI size than the second set of DCI formats.
6. The wireless communication device of claim 1 , wherein the first set of DCI formats, the second set of DCI formats, and the third set of DCI formats are different sizes.
7. The wireless communication device of claim 1 , wherein the one or more processors are configured to:
selectively perform, based at least in part on determining whether the third set of DCI formats is associated with the same DCI size as the one or more of the first set of DCI formats or the second set of DCI formats, a padding operation with regard to the third set of DCI formats so that the third set of DCI formats is not associated with a same DCI size as the first set of DCI formats or the second set of DCI formats.
8. The wireless communication device of claim 1 , wherein the second set of DCI formats are fallback DCI formats associated with the third set of DCI formats.
9. The wireless communication device of claim 1 , wherein at least one of the first set of DCI formats, the second set of DCI formats, or the third set of DCI formats are associated with a cell radio network temporary identifier.
10. A wireless communication device, comprising:
a memory; and
one or more processors coupled to the memory, the one or more processors configured to:
determine that a first downlink control information (DCI) format and a second DCI format are aligned;
decode or encode a physical downlink control channel (PDCCH) in accordance with a selected DCI format, of the first DCI format and the second DCI format, based at least in part on a rule indicating whether the PDCCH is to be decoded in accordance with the first DCI format or the second DCI format, wherein the rule indicates a first priority level associated with the first DCI format and a second priority level associated with the second DCI format; and
drop a DCI format, of the first DCI format and the second DCI format, other than the selected DCI format based at least in part on the rule, wherein the selected format is associated with a higher priority level of the first priority level and the second priority level, and wherein the DCI format is associated with a lower priority level of the first priority level and the second priority level.
11. The wireless communication device of claim 10 , wherein the first DCI format and the second DCI format are associated with different types of communications.
12. The wireless communication device of claim 10 , wherein determining that the first DCI format and the second DCI format are aligned is based at least in part on:
the first DCI format and the second DCI format having a same DCI size,
a first PDCCH candidate and a second PDCCH candidate for the PDCCH having a same scrambling identifier,
the first PDCCH candidate and the second PDCCH candidate having a same radio network temporary identifier, and
the first PDCCH candidate and the second PDCCH candidate having a same set of control channel elements.
13. The wireless communication device of claim 10 , wherein the rule indicates that the PDCCH is to be decoded in accordance with the first DCI format.
14. The wireless communication device of claim 10 , wherein the rule indicates that the PDCCH is to be decoded in accordance with the second DCI format.
15. The wireless communication device of claim 10 , wherein the rule is based at least in part on respective search spaces associated with the first DCI format and the second DCI format.
16. The wireless communication device of claim 10 , wherein the rule indicates that the second DCI format is to be used if the second DCI format is configured in a common search space, and that the first DCI format is to be used if the second DCI format is not configured in the common search space.
17. The wireless communication device of claim 10 , wherein the one or more processors are configured to:
receive or transmit radio resource control (RRC) signaling indicating the rule.
18. The wireless communication device of claim 10 , wherein the second DCI format is a fallback DCI format for uplink or downlink scheduling.
19. The wireless communication device of claim 10 , wherein the second DCI format is a DCI format for uplink or downlink scheduling.
20. A method of wireless communication performed by a wireless communication device, comprising:
determining that a first set of downlink control information (DCI) formats is associated with a same DCI size as a second set of DCI formats;
determining, based at least in part on determining that the first set of DCI formats is associated with the same DCI size as the second set of DCI formats, whether a third set of DCI formats is associated with a same DCI size as one or more of the first set of DCI formats or the second set of DCI formats;
determining, based at least in part on determining whether the third set of DCI formats is associated with the same DCI size as the one or more of the first set of DCI formats or the second set of DCI formats, whether a first DCI format of the third set of DCI formats and a second DCI format of the third set of DCI formats have a different DCI size; and
selectively performing, based at least in part on determining whether the first DCI format of the third set of DCI formats and the second DCI format of the third set of DCI formats have the different DCI size, an operation that aligns DCI sizes of the first DCI format and the second DCI format with each other.
21. The method of claim 20 , wherein the first set of DCI formats and the second set of DCI formats are associated with different types of communications.
22. The method of claim 20 , further comprising:
performing a communication using one or more of the first set of DCI formats, the second set of DCI formats, or the third set of DCI formats based at least in part on selectively performing the operation.
23. The method of claim 20 , wherein the first set of DCI formats is associated with a first search space and the second set of DCI formats is associated with a second search space.
24. The method of claim 20 , further comprising:
performing, based at least in part on determining whether the first set of DCI formats is associated with the same DCI size as the second set of DCI formats, a padding operation so that the first set of DCI formats is associated with a different DCI size than the second set of DCI formats.
25. The method of claim 20 , wherein at least one of the first set of DCI formats, the second set of DCI formats, or the third set of DCI formats are associated with a cell radio network temporary identifier.
26. A method of wireless communication performed by a wireless communication device, comprising:
determining that a first downlink control information (DCI) format and a second DCI format are aligned;
decoding a physical downlink control channel (PDCCH) in accordance with a selected DCI format, of the first DCI format and the second DCI format, based at least in part on a rule indicating whether the PDCCH is to be decoded in accordance with the first DCI format or the second DCI format, wherein the rule indicates a first priority level associated with the first DCI format and a second priority level associated with the second DCI format; and
dropping a DCI format, of the first DCI format and the second DCI format, other than the selected DCI format based at least in part on the rule, wherein the selected format is associated with a higher priority level of the first priority level and the second priority level, and wherein the DCI format is associated with a lower priority level of the first priority level and the second priority level.
27. The method of claim 26 , wherein the first DCI format and the second DCI format are associated with different types of communications.
28. The method of claim 26 , wherein determining that the first DCI format and the second DCI format are aligned is based at least in part on:
the first DCI format and the second DCI format having a same DCI size,
a first PDCCH candidate and a second PDCCH candidate for the PDCCH having a same scrambling identifier,
the first PDCCH candidate and the second PDCCH candidate having a same radio network temporary identifier, and
the first PDCCH candidate and the second PDCCH candidate having a same set of control channel elements.
29. The method of claim 26 , wherein the rule indicates that the PDCCH is to be decoded in accordance with the first DCI format.
30. The method of claim 26 , wherein the rule indicates that the PDCCH is to be decoded in accordance with the second DCI format.