US Patent 10039131 Sounding reference signal transmission in a wireless network

A wireless device receives message(s) comprising configuration parameters of sounding reference signals on a secondary cell in a secondary cell group. The wireless device transmits one or more of the sounding reference signals on the secondary cell after applying a timing advance to the secondary cell group. The wireless device is configured to not transmit any of the sounding reference signals on the secondary cell after receiving the message(s) and before receiving the timing advance.