Patent ID: 8625405

Claim:
A method for use in a wireless device, the method comprising: a) receiving at least one radio resource control (RRC) message from a base station, said at least one RRC message causing in said wireless device: i) assignment of a carrier to a second carrier group in a plurality of carrier groups comprising a first carrier group and said second carrier group; ii) configuration of transmissions of sounding reference signals on said carrier; b) receiving a control command configured to cause transmission of a random access preamble on random access resources in said second carrier group; c) receiving a random access response comprising a long time alignment value for said second carrier group and a preamble identifier; and d) transmitting one or more of said sounding reference signals on said carrier after adjusting uplink transmission timing of said second carrier group based on said long time alignment value, said wireless device configured to not transmit any of said sounding reference signals on said carrier until said wireless device receives said random access response comprising said long time alignment value and an uplink grant.