1. A method comprising:receiving, by a wireless device from a base station, one or more messages comprising configuration parameters of a cell, wherein the configuration parameters comprise:
a first value for a first timer; and
a second value for a second timer;
starting, based on the first value and a medium-access control (MAC) control element (CE), the first timer;
receiving, via a primary cell, downlink control information (DCI), wherein the DCI comprises a field indicating an activation for a secondary cell;
starting, based on the second value and the DCI, the second timer; and
activating, while the first timer and the second timer are both running, the secondary cell.