Multiple active bandwidth parts

1. A method comprising:

activating, by a wireless device, a primary bandwidth part (BWP) of a cell and a secondary BWP of the cell;

based on a determination that the primary BWP is active, switching from the primary BWP to a default BWP of the cell as an active BWP of the cell; and

based on the switching from the primary BWP to the default BWP and based on a determination that the secondary BWP is active, deactivating the secondary BWP.

2. The method of claim 1 , further comprising:

receiving at least one radio resource control (RRC) message indicating the default BWP.

3. The method of claim 1 , further comprising:

receiving one or more radio resource control (RRC) messages comprising at least one of:

an indication of the primary BWP; and

an indication of the secondary BWP.

4. The method of claim 1 , wherein:

the primary BWP comprises a common search space; and

the secondary BWP comprises a user-device specific search space.

5. The method of claim 1 , wherein the switching is based on a period of inactivity of the primary BWP.

6. The method of claim 5 , wherein the period of inactivity comprises at least one of:

a period of inactivity of the primary BWP after receiving a downlink signal in a first slot;

a period of time associated with a BWP inactivity timer; or

not receiving downlink control information (DCI) before an expiration of the BWP inactivity timer.

7. The method of claim 1 , further comprising:

monitoring a downlink control channel on the primary BWP for downlink control information (DCI), wherein the switching from the primary BWP to the default BWP is based on a determination that the DCI is not received during the monitoring.

8. The method of claim 1 , further comprising:

switching from the default BWP to a third BWP of the cell as the active BWP;

based on receiving a second downlink signal via the third BWP, starting a BWP inactivity timer;

receiving, via the third BWP, a third downlink signal indicating at least one of:

activating a fourth BWP of the cell;

deactivating the fourth BWP of the cell;

switching from the fourth BWP to a fifth BWP as a second secondary BWP; or

allocating radio resources for the fourth BWP; and

based on the third downlink signal, restarting the BWP inactivity timer.

9. The method of claim 8 , wherein the third BWP and the primary BWP are a same active BWP of the cell.

10. The method of claim 1 , wherein the default BWP is different from the primary BWP and the secondary BWP.

11. The method of claim 1 , wherein the switching from the primary BWP to the default BWP comprises:

deactivating the primary BWP; and

activating the default BWP as the active BWP.

12. The method of claim 1 , wherein the activating the primary BWP and the secondary BWP comprises:

activating the primary BWP during a first time interval; and

activating the secondary BWP during a second time interval.

13. A wireless device comprising:

one or more processors; and

memory storing instructions that, when executed by the one or more processors, cause the wireless device to:

activate a primary bandwidth part (BWP) of a cell and a secondary BWP of the cell;

based on a determination that the primary BWP is active, switch from the primary BWP to a default BWP of the cell as an active BWP of the cell; and

based on switching from the primary BWP to the default BWP and based on a determination that the secondary BWP is active, deactivate the secondary BWP.

14. The wireless device of claim 13 , wherein the instructions, when executed by the one or more processors, cause the wireless device to:

receive at least one radio resource control (RRC) message indicating the default BWP.

15. The wireless device of claim 13 , wherein the instructions, when executed by the one or more processors, cause the wireless device to:

receive one or more radio resource control (RRC) messages comprising at least one of:

an indication of the primary BWP; and

an indication of the secondary BWP.

16. The wireless device of claim 13 , wherein:

the primary BWP comprises a common search space; and

the secondary BWP comprises a user-device specific search space.

17. The wireless device of claim 13 , wherein the switching is based on a period of inactivity of the primary BWP.

18. The wireless device of claim 17 , wherein the period of inactivity comprises at least one of:

a period of inactivity of the primary BWP after receiving a downlink signal in a first slot;

a period of time associated with a BWP inactivity timer; or

not receiving downlink control information (DCI) before an expiration of the BWP inactivity timer.

19. The wireless device of claim 13 , wherein the instructions, when executed by the one or more processors, cause the wireless device to:

monitor a downlink control channel on the primary BWP for downlink control information (DCI), wherein the switching from the primary BWP to the default BWP is based on a determination that the DCI is not received during the monitoring.

20. The wireless device of claim 13 , wherein the instructions, when executed by the one or more processors, cause the wireless device to:

switch from the default BWP to a third BWP of the cell as the active BWP;

based on receiving a second downlink signal via the third BWP, start a BWP inactivity timer;

receive, via the third BWP, a third downlink signal indicating at least one of:

activating a fourth BWP of the cell;

deactivating the fourth BWP of the cell;

switching from the fourth BWP to a fifth BWP as a second secondary BWP; or

allocating radio resources for the fourth BWP; and

based on the third downlink signal, restart the BWP inactivity timer.

21. The wireless device of claim 20 , wherein the third BWP and the primary BWP are a same active BWP of the cell.

22. The wireless device of claim 13 , wherein the default BWP is different from the primary BWP and the secondary BWP.

23. The wireless device of claim 13 , wherein the instructions to switch from the primary BWP to the default BWP cause the wireless device to:

deactivate the primary BWP; and

activate the default BWP as the active BWP.

24. The wireless device of claim 13 , wherein the instructions, when executed by the one or more processors, cause the wireless device to:

activate the primary BWP during a first time interval; and

activate the secondary BWP during a second time interval.

25. A non-transitory computer-readable medium comprising instructions that, when executed, configure a wireless device to:

activate a primary bandwidth part (BWP) of a cell and a secondary BWP of the cell;

based on a determination that the primary BWP is active, switch from the primary BWP to a default BWP of the cell as an active BWP of the cell; and

based on switching from the primary BWP to the default BWP and based on a determination that the secondary BWP is active, deactivate the secondary BWP.

26. The non-transitory computer-readable medium of claim 25 , wherein the instructions, when executed, configure the wireless device to:

receive at least one radio resource control (RRC) message indicating the default BWP.

27. The non-transitory computer-readable medium of claim 25 , wherein the instructions, when executed, configure the wireless device to:

receive one or more radio resource control (RRC) messages comprising at least one of:

an indication of the primary BWP; and

an indication of the secondary BWP.

28. The non-transitory computer-readable medium of claim 25 , wherein:

the primary BWP comprises a common search space; and

the secondary BWP comprises a user-device specific search space.

29. The non-transitory computer-readable medium of claim 25 , wherein the switching is based on a period of inactivity of the primary BWP.

30. The non-transitory computer-readable medium of claim 29 , wherein the period of inactivity comprises at least one of:

a period of inactivity of the primary BWP after receiving a downlink signal in a first slot;

a period of time associated with a BWP inactivity timer; or

not receiving downlink control information (DCI) before an expiration of the BWP inactivity timer.

31. The non-transitory computer-readable medium of claim 25 , wherein the instructions, when executed, configure the wireless device to:

monitor a downlink control channel on the primary BWP for downlink control information (DCI), wherein the switching from the primary BWP to the default BWP is based on a determination that the DCI is not received during the monitoring.

32. The non-transitory computer-readable medium of claim 25 , wherein the instructions, when executed, configure the wireless device to:

switch from the default BWP to a third BWP of the cell as the active BWP;

based on receiving a second downlink signal via the third BWP, start a BWP inactivity timer;

receive, via the third BWP, a third downlink signal indicating at least one of:

activating a fourth BWP of the cell;

deactivating the fourth BWP of the cell;

switching from the fourth BWP to a fifth BWP as a second secondary BWP; or

allocating radio resources for the fourth BWP; and

based on the third downlink signal, restart the BWP inactivity timer.

33. The non-transitory computer-readable medium of claim 32 , wherein the third BWP and the primary BWP are a same active BWP of the cell.

34. The non-transitory computer-readable medium of claim 25 , wherein the default BWP is different from the primary BWP and the secondary BWP.

35. The non-transitory computer-readable medium of claim 25 , wherein the instructions to switch from the primary BWP to the default BWP configure the wireless device to:

deactivate the primary BWP; and

activate the default BWP as the active BWP.

36. The non-transitory computer-readable medium of claim 25 , wherein the instructions, when executed, configure the wireless device to:

activate the primary BWP during a first time interval; and

activate the secondary BWP during a second time interval.

37. A method comprising:

activating, by a base station, a primary bandwidth part (BWP) of a cell and a secondary BWP of the cell;

based on a determination that the primary BWP is active, switching, for a wireless device, from the primary BWP to a default BWP of the cell as an active BWP of the cell; and

based on the switching from the primary BWP to the default BWP and based on a determination that the secondary BWP is active, deactivating, for the wireless device, the secondary BWP.

38. The method of claim 37 , further comprising:

sending, to the wireless device, at least one radio resource control (RRC) message indicating the default BWP.

39. The method of claim 37 , further comprising:

sending, to the wireless device, one or more radio resource control (RRC) messages comprising at least one of:

an indication of the primary BWP; and

an indication of the secondary BWP.

40. The method of claim 37 , wherein:

the primary BWP comprises a common search space; and

the secondary BWP comprises a user-device specific search space.

41. The method of claim 37 , wherein the switching is based on a period of inactivity of the primary BWP.

42. The method of claim 37 , wherein the default BWP is different from the primary BWP and the secondary BWP.

43. The method of claim 37 , wherein the activating the primary BWP and the secondary BWP comprises:

activating the primary BWP during a first time interval; and

activating the secondary BWP during a second time interval.