Resolving ambiguities resulting from overlapping physical downlink control channel candidates of different aggregation levels
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive configuration information identifying a plurality of physical downlink control channel (PDCCH) candidates that are to be monitored for downlink control information (DCI). The plurality of PDCCH candidates may include a PDCCH candidate having a first aggregation level and a set of linked PDCCH candidates, for repetitions of DCI, having a second aggregation level. The PDCCH candidate may overlap with one PDCCH candidate of the set of linked PDCCH candidates. The UE may communicate according to one or more rules for the PDCCH candidate overlapping with the one PDCCH candidate of the set of linked PDCCH candidates. Numerous other aspects are described.
1. An apparatus for wireless communication at a user equipment (UE), the apparatus comprising:
a memory; and
one or more processors, coupled to the memory, configured to:
receive configuration information identifying a physical downlink control channel (PDCCH) candidate and a set of linked PDCCH candidates that are to be monitored for downlink control information (DCI),
wherein the PDCCH candidate has a first aggregation level and the set of linked PDCCH candidates are for repetitions of DCI and have a second aggregation level, and
wherein the PDCCH candidate and one or more PDCCH candidates of the set of linked PDCCH candidates are overlapping and associated with a same control resource set; and
communicate according to one or more rules for the PDCCH candidate overlapping with the one or more PDCCH candidates of the set of linked PDCCH candidates.
2. The apparatus of claim 1 , wherein the first aggregation level is one of 8 or 16 and the second aggregation level is the other of 8 or 16.
3. The apparatus of claim 1 , wherein the PDCCH candidate and the one or more PDCCH candidates of the set of linked PDCCH candidates have a same starting control channel element; and
wherein the same control resource set has a duration of one symbol.
4. The apparatus of claim 3 , wherein the same control resource set is configured with non-interleaved control channel element-to-resource element group mapping.
5. The apparatus of claim 1 , wherein the one or more processors are further configured to:
determine that the overlap of the PDCCH candidate and the one or more PDCCH candidates of the set of linked PDCCH candidates is an error if the PDCCH candidate and the one or more PDCCH candidates of the set of linked PDCCH candidates have the same starting control channel element.
6. The apparatus of claim 5 , wherein the PDCCH candidate is linked with another PDCCH candidate.
7. The apparatus of claim 1 , wherein, according to the one or more rules, information, used for performing one or more procedures, is based at least in part on an assumption that the DCI is detected by the UE in the one or more PDCCH candidates of the set of linked PDCCH candidates.
8. The apparatus of claim 1 , wherein the one or more processors, to communicate according to the one or more rules, are configured to:
drop the PDCCH candidate or the one or more PDCCH candidates of the set of linked PDCCH candidates.
9. The apparatus of claim 8 , wherein a one of the PDCCH candidate or the one or more PDCCH candidates of the set of linked PDCCH candidates that are dropped has a lower priority.
10. The apparatus of claim 8 , wherein the one or more processors, to communicate according to the one or more rules, are configured to:
drop an other PDCCH candidate of the set of linked PDCCH candidates if the one or more PDCCH candidates of the set of linked PDCCH candidates are dropped.
11. The apparatus of claim 8 , wherein the one or more processors, to communicate according to the one or more rules, are configured to:
monitor an other PDCCH candidate of the set of linked PDCCH candidates if one or more PDCCH candidates of the set of linked PDCCH candidates are dropped,
wherein the DCI is detected in the other PDCCH candidate of the set of linked PDCCH candidates.
12. The apparatus of claim 11 , wherein information, used for performing one or more procedures, is based at least in part on a reference PDCCH candidate of the set of linked PDCCH candidates.
13. The apparatus of claim 11 , wherein information, used for performing one or more procedures, is based at least in part on an assumption that the other PDCCH candidate of the set of linked PDCCH candidates is not linked to the one or more PDCCH candidates of the set of linked PDCCH candidates.
14. The apparatus of claim 1 , wherein, according to the one or more rules, information, used for performing one or more procedures, is based at least in part on an assumption that the DCI is detected by the UE in the PDCCH candidate that is non-linked.
15. The apparatus of claim 1 , wherein, according to the one or more rules, information, used for performing one or more procedures, is based at least in part on an assumption that the DCI is detected by the UE in the one or more PDCCH candidates of the set of linked PDCCH candidates if the one or more PDCCH candidates of the set of linked PDCCH candidates are associated with a higher priority than the PDCCH candidate that is non-linked, or based at least in part on an assumption that the DCI is detected by the UE in the PDCCH candidate that is non-linked if the PDCCH candidate is associated with a higher priority than the one or more PDCCH candidates of the set of linked PDCCH candidates.
16. An apparatus for wireless communication at a network node, the apparatus comprising:
a memory; and
one or more processors, coupled to the memory, configured to:
transmit, for a user equipment (UE), configuration information identifying a physical downlink control channel (PDCCH) candidate and a set of linked PDCCH candidates that are to be monitored for downlink control information (DCI),
wherein the PDCCH candidate has a first aggregation level and the set of linked PDCCH candidates are for repetitions of DCI and have a second aggregation level, and
wherein the PDCCH candidate and one or more PDCCH candidates of the set of linked PDCCH candidates are overlapping and associated with a same control resource set; and
communicate according to one or more rules for the PDCCH candidate overlapping with the one or more PDCCH candidates of the set of linked PDCCH candidates.
17. The apparatus of claim 16 , wherein the first aggregation level is one of 8 or 16 and the second aggregation level is the other of 8 or 16.
18. The apparatus of claim 16 , wherein the PDCCH candidate and the one or more PDCCH candidates of the set of linked PDCCH candidates have a same starting control channel element; and
wherein the same control resource set has a duration of one symbol.
19. The apparatus of claim 18 , wherein the same control resource set is configured with non-interleaved control channel element-to-resource element group mapping.
20. The apparatus of claim 16 , wherein the one or more processors are further configured to:
determine that the overlap of the PDCCH candidate and the one or more PDCCH candidates of the set of linked PDCCH candidates is an error if the PDCCH candidate and the one or more PDCCH candidates of the set of linked PDCCH candidates have the same starting control channel element.
21. The apparatus of claim 20 , wherein the PDCCH candidate is linked with another PDCCH candidate.
22. The apparatus of claim 16 , wherein, according to the one or more rules, information, used for performing one or more procedures, is based at least in part on an assumption that the DCI is detected by the UE in the one or more PDCCH candidates of the set of linked PDCCH candidates.
23. The apparatus of claim 16 , wherein the one or more processors, to communicate according to the one or more rules, are configured to:
drop the PDCCH candidate or the one or more PDCCH candidates of the set of linked PDCCH candidates.
24. The apparatus of claim 23 , wherein a one of the PDCCH candidate or the one or more PDCCH candidates of the set of linked PDCCH candidates that are dropped has a lower priority.
25. The apparatus of claim 23 , wherein the one or more processors, to communicate according to the one or more rules, are configured to:
drop an other PDCCH candidate of the set of linked PDCCH candidates if the one or more PDCCH candidates of the set of linked PDCCH candidates is dropped.
26. The apparatus of claim 23 , wherein the one or more processors, to communicate according to the one or more rules, are configured to:
transmit the DCI using an other PDCCH candidate of the set of linked PDCCH candidates if the one or more PDCCH candidates of the set of linked PDCCH candidates are dropped.
27. The apparatus of claim 26 , wherein information, used for performing one or more procedures, is based at least in part on a reference PDCCH candidate of the set of linked PDCCH candidates.
28. The apparatus of claim 26 , wherein information, used for performing one or more procedures, is based at least in part on an assumption that the other PDCCH candidate of the set of linked PDCCH candidates is not linked to the one or more PDCCH candidates of the set of linked PDCCH candidates.
29. The apparatus of claim 16 , wherein, according to the one or more rules, information, used for performing one or more procedures, is based at least in part on an assumption that the DCI is detected by the UE in the PDCCH candidate that is non-linked.
30. The apparatus of claim 16 , wherein, according to the one or more rules, information, used for performing one or more procedures, is based at least in part on an assumption that the DCI is detected by the UE in the one or more PDCCH candidates of the set of linked PDCCH candidates if the one or more PDCCH candidates of the set of linked PDCCH candidates are associated with a higher priority than the PDCCH candidate that is non-linked, or based at least in part on an assumption that the DCI is detected by the UE in the PDCCH candidate that is non-linked if the PDCCH candidate is associated with a higher priority than the one or more PDCCH candidates of the set of linked PDCCH candidates.
31. A method of wireless communication performed by an apparatus for a user equipment (UE), the method comprising:
receiving configuration information identifying a physical downlink control channel (PDCCH) candidate and a set of linked PDCCH candidates that are to be monitored for downlink control information (DCI),
wherein the PDCCH candidate has a first aggregation level and the set of linked PDCCH candidates are for repetitions of DCI and have a second aggregation level, and
wherein the PDCCH candidate and one or more PDCCH candidates of the set of linked PDCCH candidates are overlapping and associated with a same control resource set; and
communicating according to one or more rules for the PDCCH candidate overlapping with the one or more PDCCH candidates of the set of linked PDCCH candidates.
32. The method of claim 31 , wherein the first aggregation level is one of 8 or 16 and the second aggregation level is the other of 8 or 16.
33. The method of claim 31 , wherein the PDCCH candidate and the one or more PDCCH candidates of the set of linked PDCCH candidates have a same starting control channel element; and
wherein the same control resource set has a duration of one symbol.
34. The method of claim 33 , wherein the same control resource set is configured with non-interleaved control channel element-to-resource element group mapping.
35. The method of claim 31 , further comprising:
determining that the overlap of the PDCCH candidate and the one or more PDCCH candidates of the set of linked PDCCH candidates is an error if the PDCCH candidate and the one or more PDCCH candidates of the set of linked PDCCH candidates have the same starting control channel element.
36. The method of claim 35 , wherein the PDCCH candidate is linked with another PDCCH candidate.
37. The method of claim 31 , wherein, according to the one or more rules, information, used for performing one or more procedures, is based at least in part on an assumption that the DCI is detected by the UE in the one or more PDCCH candidates of the set of linked PDCCH candidates.
38. A method of wireless communication performed by an apparatus for a network node, the method comprising:
transmitting, for a user equipment (UE), configuration information identifying physical downlink control channel (PDCCH) candidate and a set of linked PDCCH candidates that are to be monitored for downlink control information (DCI),
wherein the PDCCH candidate has a first aggregation level and the set of linked PDCCH candidates are for repetitions of DCI and have a second aggregation level, and
wherein the PDCCH candidate and one or more PDCCH candidates of the set of linked PDCCH candidates are overlapping and associated with a same control resource set; and
communicating according to one or more rules for the PDCCH candidate overlapping with the one or more PDCCH candidates of the set of linked PDCCH candidates.
39. The method of claim 38 , wherein the first aggregation level is one of 8 or 16 and the second aggregation level is the other of 8 or 16.
40. The method of claim 38 , wherein the PDCCH candidate and the one or more PDCCH candidates of the set of linked PDCCH candidates have a same starting control channel element; and
wherein the same control resource set has a duration of one symbol.
41. The method of claim 40 , wherein the same control resource set is configured with non-interleaved control channel element-to-resource element group mapping.
42. The method of claim 38 , further comprising:
determining that the overlap of the PDCCH candidate and the one or more PDCCH candidates of the set of linked PDCCH candidates is an error if the PDCCH candidate and the one or more PDCCH candidates of the set of linked PDCCH candidates have the same starting control channel element.
43. The method of claim 42 , wherein the PDCCH candidate is linked with another PDCCH candidate.
44. The method of claim 38 , wherein, according to the one or more rules, information, used for performing one or more procedures, is based at least in part on an assumption that the DCI is detected by the UE in the one or more PDCCH candidates of the set of linked PDCCH candidates.