Scheduling wireless communications

1. A method comprising:

receiving, by a wireless device, one or more messages comprising configuration parameters for a primary cell, wherein the primary cell comprises a first search space and a second search space, and wherein the configuration parameters comprise:

a first indication indicating that the first search space is enabled with self-carrier scheduling;

a second indication indicating that the second search space is enabled with cross-carrier scheduling; and

a third indication, of a secondary cell, for cross-carrier scheduling the primary cell;

monitoring for downlink control information (DCI), wherein the monitoring comprises at least one of:

monitoring, based on the first indication, the first search space for self-carrier scheduling via the primary cell; or

monitoring, based on the second indication, a third search space for cross-carrier scheduling via the secondary cell; and

receiving, based on the monitoring for DCI, at least one resource assignment for the primary cell.

2. The method of claim 1 , further comprising receiving a command indicating activation of cross-carrier scheduling for the primary cell, wherein the monitoring the third search space is based on the activation of cross-carrier scheduling for the primary cell.

3. The method of claim 1 , further comprising determining, based on the second search space of the primary cell, the third search space.

4. The method of claim 1 , further comprising, receiving, via the primary cell and based on the at least one resource assignment, downlink data.

5. The method of claim 1 , wherein the receiving the at least one resource assignment comprises receiving the at least one resource assignment via the third search space.

6. The method of claim 1 , wherein the receiving the at least one resource assignment comprises receiving the at least one resource assignment via the first search space.

7. The method of claim 1 , further comprising determining, based on the second search space of the primary cell, the third search space, wherein the determining the third search space comprises determining a search space indicator of the third search space that is associated with a search space indicator of the second search space.

8. The method of claim 1 , further comprising determining, based on the second search space of the primary cell, the third search space, wherein the determining the third search space comprises determining a search space indicator of the third search space that is the same as a search space indicator of the second search space.

9. The method of claim 1 , wherein the configuration parameters indicate a quantity of control channel candidates for the second search space, wherein the monitoring the third search space comprises monitoring the third search space based on the quantity of control channels for the second search space.

10. A method comprising:

receiving, by a wireless device, one or more messages comprising configuration parameters for a primary cell, wherein the configuration parameters comprise:

an indication of a secondary cell for cross-carrier scheduling the primary cell, wherein the primary cell comprises a first search space and the secondary cell comprises a second search space;

parameters associated with the first search space; and

parameters associated with the second search space;

determining, based on the first search space of the primary cell, the second search space of the secondary cell; and

monitoring, based on the parameters associated with the first search space and the parameters associated with the second search space, the second search space of the secondary cell for first downlink control information (DCI).

11. The method of claim 10 , wherein the first DCI comprises resource assignments for the primary cell.

12. The method of claim 10 , wherein the primary cell further comprises a third search space, wherein the configuration parameters further comprise:

an indication that cross-carrier scheduling is enabled for the first search space; and

an indication that self-carrier scheduling is enabled for the third search space;

wherein the monitoring the second search space is based on cross-carrier scheduling being enabled for the first search space;

the method further comprising:

monitoring, based on self-carrier scheduling being enabled for the third search space, the third search space of the primary cell for second DCI.

13. The method of claim 10 , further comprising receiving a command indicating activation of cross-carrier scheduling for the primary cell, wherein the monitoring the second search space is based on the activation of cross-carrier scheduling for the primary cell.

14. The method of claim 10 , wherein the parameters associated with the first search space comprise an indication of a quantity of control channel candidates for the first search space, and wherein the parameters associated with the second search space comprise an indication of monitoring occasions for the second search space.

15. The method of claim 10 , wherein the determining the second search space comprises determining a search space indicator of the second search space that is associated with a search space indicator of the first search space.

16. A method comprising:

receiving, by a wireless device, one or more messages comprising configuration parameters for a primary cell, wherein the configuration parameters comprise:

a first indication indicating that a first search space of the primary cell is enabled with cross-carrier scheduling; and

a second indication, of a secondary cell, for cross-carrier scheduling the primary cell;

determining, based on the first search space of the primary cell, a second search space of the secondary cell; and

receiving, via the second search space of the secondary cell, at least one resource assignment for the primary cell.

17. The method of claim 16 , further comprising receiving a command indicating activation of cross-carrier scheduling for the primary cell, wherein the receiving, via the second search space of the secondary cell, the at least one resource assignment for the primary cell is based on the activation of cross-carrier scheduling for the primary cell.

18. The method of claim 16 , further comprising, receiving, via the primary cell and based on the at least one resource assignment, downlink data.

19. The method of claim 16 , wherein the determining the second search space comprises determining a search space indicator of the second search space that is the same as a search space indicator of the first search space.

20. The method of claim 16 , wherein the determining the second search space comprises determining the second search space based on an association with the first search space.