Cross-carrier scheduling

1. An apparatus for wireless communication at a user equipment (UE), comprising:

a memory; and

at least one processor coupled to the memory and configured to:

receive, from a base station, a configuration for one or more physical downlink control channel (PDCCH) candidates in:

at least one of one or more common search spaces (CSSs) and one or more user-specific search spaces (USSs) configured on a first cell, or

one or more CSSs configured on the first cell, and

one or more USSs configured on a second cell, the configuration for PDCCH including scheduling data for the first cell, the first cell including at least one of a primary cell (PCell) or a primary secondary cell (PSCell), and the second cell including a secondary cell (SCell); and

perform blind decoding of the one or more PDCCH candidates in at least one of the one or more CSSs or one or more USSs on the first cell and the one or more USSs on the second cell based on the configuration and within a scheduled cell limit including a first total number of blind decodes (BDs) and a second total number of non-overlapping control channel elements (CCEs) for PDCCH candidates.

2. The apparatus of claim 1 , further comprising a transceiver coupled to the at least one processor, wherein the scheduled cell limit is based on a smaller or same subcarrier spacing (SCS) associated with the first cell or the second cell.

3. The apparatus of claim 1 , wherein the at least one processor is further configured to report, to the base station, a parameter indicating PDCCH blind decoding capabilities supported by the UE for carrier aggregation (CA),

wherein the scheduled cell limit is set less than or equal to the PDCCH blind decoding capabilities supported by the UE indicated by the parameter.

4. The apparatus of claim 1 , wherein the scheduled cell limit has values less than or equal to a CA limit of the first cell and the second cell.

5. The apparatus of claim 1 , wherein the at least one processor is further configured to:

receive the PDCCH in one or more of the PDCCH candidates; and

receive a physical downlink shared channel (PDSCH) from the base station or transmitting a physical uplink shared channel (PUSCH) to the base station on the first cell based on the PDCCH.

6. The apparatus of claim 1 , wherein a first threshold indicating a first maximum number of BDs and a second threshold indicating a second maximum number of non-overlapping CCEs for the CSSs on the first cell are based on a slot having a highest number of BDs and non-overlapping CCEs for the CSSs, and

wherein a third maximum number of BDs for the USSs on the second cell is based on the scheduled cell limit of BDs minus the first threshold, and a fourth maximum number of non-overlapping CCEs for the USSs on the second cell is based on the scheduled cell limit of the non-overlapping CCEs minus the second threshold.

7. The apparatus of claim 1 , wherein the configuration further includes the one or more PDCCH candidates in the one or more USSs configured on the first cell, and

wherein the at least one processor is further configured to receive, from the base station, an indication of a first threshold indicating a first maximum number of BDs and a second threshold indicating a second maximum number of non-overlapping CCEs for the PDCCH candidates on the first cell.

8. The apparatus of claim 7 , wherein at least one of the first threshold or the second threshold are received via a radio resource control (RRC) message.

9. The apparatus of claim 7 , wherein the at least one processor is further configured to: perform the blind decoding of the one or more CSSs on the first cell and the one or more USSs on the first cell within the first threshold and the second threshold.

10. The apparatus of claim 9 , wherein a third threshold for a third maximum number BDs and a fourth threshold for a fourth maximum number of non-overlapping CCEs for the CSSs on the first cell is based on a slot having a highest number of BDs and non-overlapping CCEs for the CSSs, and the first threshold has a first value greater than or equal to the third threshold and the second threshold has a second value greater than or equal to the fourth threshold.

11. The apparatus of claim 7 , wherein the at least one processor is further configured to:

determine that at least one USS of the first USSs configured on the first cell is scheduled beyond the first threshold or the second threshold of the first cell; and

determine not to monitor the PDCCH candidates for the at least one USS of the first USSs scheduled beyond the first threshold or the second threshold.

12. The apparatus of claim 7 , wherein the at least one processor is further configured to indicate support for the one or more USSs on the first cell, wherein the configuration for the one or more USSs on the first cell is based on the UE supporting the one or more USSs on the first cell.

13. An apparatus for wireless communication at a network node, comprising:

a memory; and

at least one processor coupled to the memory and configured to:

configure a first threshold indicating a first maximum number of blind decodes (BDs) and a second threshold indicating a second maximum number of non-overlapping control channel elements (CCEs) for physical downlink control channel (PDCCH) candidates on a first cell;

output for transmission, for a user equipment (UE), a configuration for one or more PDCCH candidates in at least one of one or more common search spaces (CSSs) and one or more user-specific search spaces (USSs) configured on the first cell or one or more CSSs configured on the first cell, and one or more USSs configured on a second cell, the configuration for PDCCH including scheduling data for the first cell, the first cell including at least one of a primary cell (PCell) or a primary secondary cell (PSCell), and the second cell including a secondary cell (SCell); and

output for transmission, for the UE, at least one PDCCH in the one or more PDCCH candidates in at least one of one or more CSSs or the one or more USSs configured on the first cell and the one or more USSs configured on the second cell for the PDCCH including scheduling of the first cell based on the configuration and within a scheduled cell limit including a total number of BDs and non-overlapping CCEs for the PDCCH candidates.

14. The apparatus of claim 13 , further comprising a transceiver coupled to the at least one processor, wherein the scheduled cell limit including the total number of BDs and the non-overlapping CCEs for PDCCH candidates is based on a smaller or same subcarrier spacing (SCS) associated with the first cell or the second cell.

15. The apparatus of claim 13 , wherein the scheduled cell limit has a value less than or equal to a CA limit of the first cell and the second cell.

16. The apparatus of claim 13 , wherein the at least one processor is further configured to receive, from the UE, a parameter indicating PDCCH blind decoding capabilities supported by the UE for carrier aggregation (CA),

wherein the scheduled cell limit is set less than or equal to the PDCCH blind decoding capabilities supported by the UE indicated by the parameter.

17. The apparatus of claim 13 , wherein the at least one processor is further configured to output for transmission a physical downlink shared channel (PDSCH) or receiving a physical uplink shared channel (PUSCH) from the UE on the first cell based on the PDCCH.

18. The apparatus of claim 13 , wherein the first threshold indicates a first maximum number of BDs and a second maximum number of non-overlapping CCEs for the CSSs on the first cell are based on a slot having a highest number of BDs and the non-overlapping CCEs for the CSSs, and a third maximum number of BDs for the USSs on the second cell is based on the scheduled cell limit of BDs minus the first threshold, and a fourth maximum number of non-overlapping CCEs for the USSs on the second cell is based on the scheduled cell limit of the non-overlapping CCEs minus the second threshold.

19. The apparatus of claim 13 , wherein the configuration further includes the one or more PDCCH candidates in the one or more USSs on the first cell, and the at least one processor is further configured to output for transmission an indication of the first threshold indicating a first maximum number of BDs and the second threshold indicating a second maximum number of non-overlapping CCEs for the PDCCH candidates on the first cell.

20. The apparatus of claim 19 , wherein at least one of the first threshold or the second threshold is transmitted via a radio resource control (RRC) message.

21. The apparatus of claim 19 , wherein a third threshold for a third maximum number BDs and a fourth threshold for a fourth maximum number of non-overlapping CCEs for the CSSs on the first cell is based on a slot having a highest number of BDs and the non-overlapping CCEs for the CSSs, and the first threshold has a first value greater than or equal to the third threshold and the second threshold has a second value greater than or equal to the fourth threshold.

22. The apparatus of claim 19 , wherein at least one of the first USSs configured on the first cell is scheduled beyond the second threshold or the first threshold of the first cell.

23. The apparatus of claim 19 , wherein the at least one processor is further configured to receive an indication of support for the one or more USSs on the first cell, wherein the configuration for the one or more USSs on the first cell is based on the UE supporting the one or more USSs on the first cell.

24. A method of wireless communication at a user equipment (UE), comprising:

receiving, from a base station, a configuration for one or more physical downlink control channel (PDCCH) candidates in at least one of one or more common search spaces (CSSs) and one or more user-specific search spaces (USSs) configured on a first cell or one or more CSSs configured on the first cell, and one or more USSs configured on a second cell, the configuration for PDCCH including scheduling data for the first cell, the first cell including at least one of a primary cell (PCell) or a primary secondary cell (PSCell), and the second cell including a secondary cell (SCell); and

performing blind decoding of the one or more PDCCH candidates in at least one of the one or more CSSs or one or more USSs on the first cell and the one or more USSs on the second cell based on the configuration and within a scheduled cell limit including a first total number of blind decodes (BDs) and a second total number of non-overlapping control channel elements (CCEs) for PDCCH candidates.

25. The method of claim 24 , wherein the configuration further includes the one or more PDCCH candidates in one or more USSs configured on the first cell, and

wherein the method further comprises receiving, from the base station, an indication of a first threshold indicating a first maximum number of BDs and a second threshold indicating a second maximum number of non-overlapping CCEs for the PDCCH candidates on the first cell.

26. The method of claim 25 , further comprising:

performing blind decoding of the one or more CSSs on the first cell and the one or more USSs on the first cell within the first threshold and the second threshold,

wherein a third threshold for a third maximum number BDs and a fourth threshold for a fourth maximum number of non-overlapping CCEs for the CSSs on the first cell is based on a slot having a highest number of BDs and non-overlapping CCEs for the CSSs, and the first threshold has a first value greater than or equal to the third threshold and the second threshold has a second value greater than or equal to the fourth threshold.

27. The method of claim 25 , further comprising:

determining that at least one USS of the first USSs configured on the first cell is scheduled beyond the first threshold or the second threshold of the first cell; and

determining not to monitor the PDCCH candidates for the at least one USS of the first USSs scheduled beyond the first threshold or the second threshold.

28. A method of wireless communication at a network node, comprising:

configuring a first threshold indicating a first maximum number of blind decodes (BDs) and a second threshold indicating a second maximum number of non-overlapping control channel elements (CCEs) for physical downlink control channel (PDCCH) candidates on a first cell;

outputting for transmission, for a user equipment (UE), a configuration for one or more PDCCH candidates in at least one of one or more common search spaces (CSSs) and one or more user-specific search spaces (USSs) configured on the first cell or one or more CSSs configured on the first cell, and one or more USSs configured on a second cell, the configuration for PDCCH including scheduling data for the first cell, the first cell including at least one of a primary cell (PCell) or a primary secondary cell (PSCell), and the second cell including a secondary cell (SCell); and

outputting for transmission, for the UE, at least one PDCCH in at least one of the one or more PDCCH candidates in at least one of the one or more CSSs or the one or more USSs configured on the first cell and the one or more USSs configured on the second cell for the PDCCH including scheduling of the first cell based on the configuration and within a scheduled cell limit including a total number of BDs and non-overlapping CCEs for the PDCCH candidates.

29. The method of claim 28 , wherein the scheduled cell limit including the total number of BDs and the non-overlapping CCEs for PDCCH candidates is based on a smaller or same subcarrier spacing (SCS) associated with the first cell or the second cell.

30. The method of claim 28 , wherein the configuration further includes the one or more PDCCH candidates in the one or more USSs on the first cell, wherein the method further comprises outputting for transmission an indication of the first threshold indicating a first maximum number of BDs and the second threshold indicating a second maximum number of non-overlapping CCEs for the PDCCH candidates on the first cell.