US Patent 8982852 Random access in networks with carrier aggregation

A wireless device configures a deactivation timer for a secondary cell in a secondary cell group. The wireless device may receive a control command initiating a random access process for the secondary cell. The wireless device may transmit a random access preamble on random access resources of the secondary cell in response to receiving the control command. The wireless device may abort the random access process on the secondary cell if the secondary cell is deactivated before the wireless device receives, on the primary cell, a random access response for the random access preamble transmission.