Sounding Reference Signal

摘要

A wireless device receives RRC message(s) configuring transmissions of sounding reference signals on a second carrier in a second carrier group. The wireless device receives a random access response comprising a timing advance command. The wireless device transmits the sounding reference signals on the second carrier after applying the timing advance command to the second carrier group. The wireless device is configured to not transmit any of the sounding reference signals on the second carrier during a period between receiving the RRC message and applying the timing advance command to the second carrier group.