Cell activation and deactivation in a wireless network

1. A method comprising:

based on receiving, by a wireless device, a medium access control (MAC) control element (CE) indicating activation of a cell:

activating the cell; and

starting a first timer;

based on receiving first downlink control information (DCI) indicating monitoring of a downlink control channel:

starting a second timer; and

monitoring the downlink control channel; and

receiving, while the first timer and the second timer are both running, second DCI comprising an indication of a resource grant.

2. The method of claim 1 , further comprising restarting, based on the receiving the second DCI, the second timer.

3. The method of claim 1 , further comprising:

stopping the second timer; and

stopping monitoring of the downlink control channel;

wherein the stopping the second timer and the stopping the monitoring of the downlink control channel are based on one or more of:

the first timer expiring; or

receiving a second MAC CE, wherein the second MAC CE indicates a deactivation of the cell.

4. The method of claim 1 , further comprising stopping, based on the second timer expiring and while an activation status of the cell is maintained, monitoring of the downlink control channel.

5. The method of claim 1 , further comprising:

based on the cell being active:

measuring one or more reference signals; or

monitoring a second downlink control channel for receiving the first DCI.

6. The method of claim 5 , wherein at least one of the one or more reference signals is a channel state information reference signal.

7. The method of claim 1 , further comprising measuring one or more reference signals after activating the cell.

8. The method of claim 1 , wherein the first timer is associated with physical layer deactivation.

9. The method of claim 1 , wherein the second timer is associated with secondary cell deactivation.

10. The method of claim 1 , wherein the resource grant is at least one of:

a downlink assignment; or

an uplink grant.

11. The method of claim 1 , further comprising receiving configuration parameters comprising:

a first value for the first timer; and

a second value for the second timer.

12. The method of claim 1 , further comprising transmitting, based on the resource grant, at least one transmission.

13. A method comprising:

based on transmitting, by a base station, a medium access control (MAC) control element (CE) indicating activation of a cell:

activating the cell; and

starting a first timer;

based on transmitting first downlink control information (DCI), starting a second timer associated with monitoring of a downlink control channel; and

transmitting, while the first timer and the second timer are both running, second DCI comprising an indication of a resource grant.

14. The method of claim 13 , further comprising, based on the second DCI, restarting the second timer.

15. The method of claim 13 , further comprising stopping the second timer based on one or more of:

the first timer expiring; or

transmitting a second MAC CE indicating deactivation of the cell.

16. The method of claim 13 , wherein the first timer is associated with physical layer deactivation.

17. The method of claim 13 , wherein the second timer is associated with secondary cell deactivation.

18. The method of claim 13 , wherein the resource grant is at least one of:

a downlink assignment; or

an uplink grant.

19. The method of claim 13 , further comprising transmitting configuration parameters comprising:

a first value for the first timer; and

a second value for the second timer.

20. The method of claim 13 , further comprising receiving, based on the resource grant, at least one transmission.

21. 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:

based on receiving a medium access control (MAC) control element (CE) indicating activation of a cell:

activate the cell; and

start a first timer;

based on receiving first downlink control information (DCI) indicating monitoring of a downlink control channel:

start a second timer; and

monitor the downlink control channel; and

receive, while the first timer and the second timer are both running, second DCI comprising an indication of a resource grant.

22. The wireless device of claim 21 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to restart, based on the receiving the second DCI, the second timer.

23. The wireless device of claim 21 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to:

stop the second timer; and

stop monitoring of the downlink control channel;

wherein stopping the second timer and stopping the monitoring of the downlink control channel are based on one or more of:

the first timer expiring; or

receiving a second MAC CE, wherein the second MAC CE indicates a deactivation of the cell.

24. The wireless device of claim 21 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to stop, based on the second timer expiring and while an activation status of the cell is maintained, monitoring of the downlink control channel.

25. The wireless device of claim 21 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to, based on the cell being active, perform at least one of:

measure one or more reference signals; or

monitor a second downlink control channel for receiving the first DCI.

26. The wireless device of claim 25 , wherein at least one of the one or more reference signals is a channel state information reference signal.

27. The wireless device of claim 21 , wherein the instructions, when executed by the one or more processors, cause the wireless device to measure one or more reference signals after activating the cell.

28. The wireless device of claim 21 , wherein the first timer is associated with physical layer deactivation.

29. The wireless device of claim 21 , wherein the second timer is associated with secondary cell deactivation.

30. The wireless device of claim 21 , wherein the resource grant is at least one of:

a downlink assignment; or

an uplink grant.

31. The wireless device of claim 21 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to receive configuration parameters comprising:

a first value for the first timer; and

a second value for the second timer.

32. The wireless device of claim 21 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to transmit, based on the resource grant, at least one transmission.

33. A base station comprising:

one or more processors; and

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

based on transmitting a medium access control (MAC) control element (CE) indicating activation of a cell:

activate the cell; and

start a first timer;

based on transmitting first downlink control information (DCI), start a second timer associated with monitoring of a downlink control channel; and

transmit, while the first timer and the second timer are both running, second DCI comprising an indication of a resource grant.

34. The base station of claim 33 , wherein the instructions, when executed by the one or more processors, further cause the base station to, based on the second DCI, restart the second timer.

35. The base station of claim 33 , wherein the instructions, when executed by the one or more processors, further cause the base station to stop the second timer based on one or more of:

the first timer expiring; or

transmitting a second MAC CE indicating deactivation of the cell.

36. The base station of claim 33 , wherein the first timer is associated with physical layer deactivation.

37. The base station of claim 33 , wherein the second timer is associated with secondary cell deactivation.

38. The base station of claim 33 , wherein the resource grant is at least one of:

a downlink assignment; or

an uplink grant.

39. The base station of claim 33 , wherein the instructions, when executed by the one or more processors, further cause the base station to transmit configuration parameters comprising:

a first value for the first timer; and

a second value for the second timer.

40. The base station of claim 33 , wherein the instructions, when executed by the one or more processors, further cause the base station to receive, based on the resource grant, at least one transmission.

41. A non-transitory computer-readable medium storing instructions that, when executed, cause a wireless device to:

based on receiving a medium access control (MAC) control element (CE) indicating activation of a cell:

activate the cell; and

start a first timer;

based on receiving first downlink control information (DCI) indicating monitoring of a downlink control channel:

start a second timer; and

monitor the downlink control channel; and

receive, while the first timer and the second timer are both running, second DCI comprising an indication of a resource grant.

42. The non-transitory computer-readable medium of claim 41 , wherein the instructions, when executed, further cause the wireless device to restart, based on the receiving the second DCI, the second timer.

43. The non-transitory computer-readable medium of claim 41 , wherein the instructions, when executed, further cause the wireless device to:

stop the second timer; and

stop monitoring of the downlink control channel;

wherein stopping the second timer and stopping monitoring of the downlink control channel are based on one or more of:

the first timer expiring; or

receiving a second MAC CE, wherein the second MAC CE indicates a deactivation of the cell.

44. The non-transitory computer-readable medium of claim 41 , wherein the instructions, when executed, further cause the wireless device to stop, based on the second timer expiring and while an activation status of the cell is maintained, monitoring of the downlink control channel.

45. The non-transitory computer-readable medium of claim 41 , wherein the instructions, when executed, further cause the wireless device to, based on the cell being active, perform at least one of:

measure one or more reference signals; or

monitor a second downlink control channel for receiving the first DCI.

46. The non-transitory computer-readable medium of claim 45 , wherein at least one of the one or more reference signals is a channel state information reference signal.

47. The non-transitory computer-readable medium of claim 41 , wherein the instructions, when executed, further cause the wireless device to measure one or more reference signals after activating the cell.

48. The non-transitory computer-readable medium of claim 41 , wherein the first timer is associated with physical layer deactivation.

49. The non-transitory computer-readable medium of claim 41 , wherein the second timer is associated with secondary cell deactivation.

50. The non-transitory computer-readable medium of claim 41 , wherein the resource grant is at least one of:

a downlink assignment; or

an uplink grant.

51. The non-transitory computer-readable medium of claim 41 , wherein the instructions, when executed, further cause the wireless device to receive configuration parameters comprising:

a first value for the first timer; and

a second value for the second timer.

52. The non-transitory computer-readable medium of claim 41 , wherein the instructions, when executed, further cause the wireless device to transmit, based on the resource grant, at least one transmission.

53. A non-transitory computer-readable medium storing instructions that, when executed, cause a base station to:

based on transmitting a medium access control (MAC) control element (CE) indicating activation of a cell:

activate the cell; and

start a first timer;

based on transmitting first downlink control information (DCI), start a second timer associated with monitoring of a downlink control channel; and

transmit, while the first timer and the second timer are both running, second DCI comprising an indication of a resource grant.

54. The non-transitory computer-readable medium of claim 53 , wherein the instructions, when executed, further cause the base station to, based on the second DCI, restart the second timer.

55. The non-transitory computer-readable medium of claim 53 , wherein the instructions, when executed, further cause the base station to stop the second timer based on one or more of:

the first timer expiring; or

transmitting a second MAC CE indicating deactivation of the cell.

56. The non-transitory computer-readable medium of claim 53 , wherein the first timer is associated with physical layer deactivation.

57. The non-transitory computer-readable medium of claim 53 , wherein the second timer is associated with secondary cell deactivation.

58. The non-transitory computer-readable medium of claim 53 , wherein the resource grant is at least one of:

a downlink assignment; or

an uplink grant.

59. The non-transitory computer-readable medium of claim 53 , wherein the instructions, when executed, further cause the base station to transmit configuration parameters comprising:

a first value for the first timer; and

a second value for the second timer.

60. The non-transitory computer-readable medium of claim 53 , wherein the instructions, when executed, further cause the base station to receive, based on the resource grant, at least one transmission.

61. A system comprising:

a base station configured to transmit a medium access control (MAC) control element (CE) indicating activation of a cell; and

a wireless device configured to:

based on receiving the MAC CE:

activate the cell; and

start a first timer;

based on receiving first downlink control information (DCI) indicating monitoring of a downlink control channel:

start a second timer; and

monitor the downlink control channel; and

receive, while the first timer and the second timer are both running, second DCI comprising an indication of a resource grant.

62. The system of claim 61 , wherein the wireless device is further configured to restart, based on the receiving the second DCI, the second timer.

63. The system of claim 61 , wherein the wireless device is further configured to:

stop the second timer; and

stop monitoring of the downlink control channel;

wherein stopping the second timer and stopping the monitoring of the downlink control channel are based on one or more of:

the first timer expiring; or

receiving a second MAC CE, wherein the second MAC CE indicates a deactivation of the cell.

64. The system of claim 61 , wherein the wireless device is further configured to stop, based on the second timer expiring and while an activation status of the cell is maintained, monitoring of the downlink control channel.

65. The system of claim 61 , wherein the wireless device is further configured to, based on the cell being active, perform at least one of:

measure one or more reference signals; or

monitor a second downlink control channel for receiving the first DCI.

66. The system of claim 65 , wherein at least one of the one or more reference signals is a channel state information reference signal.

67. The system of claim 61 , wherein the wireless device is further configured to measure one or more reference signals after activating the cell.

68. The system of claim 61 , wherein the first timer is associated with physical layer deactivation.

69. The system of claim 61 , wherein the second timer is associated with secondary cell deactivation.

70. The system of claim 61 , wherein the resource grant is at least one of:

a downlink assignment; or

an uplink grant.

71. The system of claim 61 , wherein:

the base station is further configured to transmit configurations parameters comprising:

a first value for the first timer; and

a second value for the second timer; and

the wireless device is further configured to receive the configuration parameters.

72. The system of claim 61 , wherein the wireless device is further configured to transmit, based on the resource grant, at least one transmission.