A wireless device receives configuration parameters comprising a value for a bandwidth part inactivity timer. Downlink control information, indicating a resource assignment, is received on a primary cell. The bandwidth part inactivity timer of an active bandwidth part of the primary cell is started in response to determining that no random access procedure is ongoing on a secondary cell. A switch from the active bandwidth part to a default bandwidth part is made in response to an expiry of the bandwidth part inactivity timer.