US Patent 9848445 Multicarrier communications employing time alignment timers

A wireless device is configured with a primary cell group and a secondary cell group. When a first time alignment timer of the primary cell group expires, for a cell in the wireless device, the wireless device stops uplink transmission of HARQ feedback, uplink transport blocks, and channel state information while allowing uplink transmission of random access preamble(s). When a second time alignment timer of the secondary cell group expires and the first time alignment timer is running, for an activated cell in the secondary cell group, the wireless device stops transmission of uplink transport blocks, and continues downlink transmission of HARQ feedback and channel state information.