Downlink control information activating a cell and a bandwidth part

1. A method comprising:

receiving, by a wireless device, configuration parameters of a cell, the configuration parameters comprising:

bandwidth part (BWP) parameters of: a first BWP and a default BWP;

a first timer value associated with a cell deactivation timer; and

a second timer value associated with a BWP inactivity timer;

receiving a downlink control information (DCI) indicating an activation of the cell;

in response to the DCI:

activating the cell; and

starting the cell deactivation timer based on the first timer value;

activating, in response to activating the cell, the first BWP of the cell;

starting the BWP inactivity timer based on the second timer value;

receiving a second DCI indicating a downlink assignment or an uplink grant on the first BWP;

in response to receiving the second DCI:

restarting the BWP inactivity timer; and

restarting the cell deactivation timer; and

in response to expiry of the BWP inactivity timer, switching from the first BWP to the default BWP as an active BWP.

2. The method of claim 1 , wherein the cell is a secondary cell of a plurality of cells.

3. The method of claim 1 , wherein the BWP parameters of the first BWP or the default BWP indicate at least one of:

a frequency location;

a bandwidth;

a value of subcarrier spacing;

a cyclic prefix; or

one or more reference signal resource configurations.

4. The method of claim 1 , wherein the switching from the first BWP to the default BWP comprises monitoring a downlink control channel on the default BWP.

5. The method of claim 1 , wherein the wireless device starts the BWP inactivity timer in response to receiving the DCI indicating the activation of the cell.

6. The method of claim 1 , further comprising deactivating the cell in response to at least one of:

an expiry of the cell deactivation timer; and

receiving a second DCI indicating a deactivation of the cell.

7. The method of claim 6 , further comprising stopping the BWP inactivity timer in response to the deactivating the cell.

8. The method of claim 1 , wherein activating the first BWP comprises monitoring a downlink control channel on the first BWP.

9. 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:

receive configuration parameters of a cell, the configuration parameters comprising:

bandwidth part (BWP) parameters of: a first BWP and a default BWP;

a first timer value associated with a cell deactivation timer; and

a second timer value associated with a BWP inactivity timer;

receive a downlink control information (DCI) indicating an activation of the cell;

in response to the DCI:

activate the cell; and

start the cell deactivation timer based on the first timer value;

activate, in response to the activation of the cell, the first BWP of the cell;

start the BWP inactivity timer based on the second timer value;

receive a second DCI indicating a downlink assignment or an uplink grant on the first BWP;

in response to receiving the second DCI:

restarting the BWP inactivity timer; and

restarting the cell deactivation timer; and

in response to expiry of the BWP inactivity timer, switch from the first BWP to the default BWP as an active BWP.

10. The wireless device of claim 9 , wherein the cell is a secondary cell of a plurality of cells.

11. The wireless device of claim 9 , wherein the BWP parameters of the first BWP or the default BWP indicate at least one of:

a frequency location;

a bandwidth;

a value of subcarrier spacing;

a cyclic prefix; or

one or more reference signal resource configurations.

12. The wireless device of claim 9 , wherein the switch from the first BWP to the default BWP comprises monitoring a downlink control channel on the default BWP.

13. The wireless device of claim 9 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to start the BWP inactivity timer in response to reception of the DCI indicating the activation of the cell.

14. The wireless device of claim 9 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to deactivate the cell in response to at least one of:

an expiry of the cell deactivation timer; or

reception of a second DCI indicating a deactivation of the cell.

15. The wireless device of claim 14 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to stop the BWP inactivity timer in response to the deactivation of the cell.

16. A system comprising:

a base station; and

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:

receive, from the base station, configuration parameters of a cell, the configuration parameters comprising:

bandwidth part (BWP) parameters of: a first BWP and a default BWP;

a first timer value associated with a cell deactivation timer; and

a second timer value associated with a BWP inactivity timer;

receive a downlink control information (DCI) indicating an activation of the cell;

in response to the DCI:

activate the cell; and

start the cell deactivation timer based on the first timer value;

activate, in response to the activation of the cell, the first BWP of the cell;

start the BWP inactivity timer based on the second timer value;

receive a second DCI indicating a downlink assignment or an uplink grant on the first BWP;

in response to receiving the second DCI:

restarting the BWP inactivity timer; and

restarting the cell deactivation timer; and

in response to expiry of the BWP inactivity timer, switch from the first BWP to the default BWP as an active BWP.