Patent ID: 8625404
Filing Date: 2014-01-07
Classification: H04L,H04W

Abstract:
1. A method comprising: a) receiving, by a wireless device, at least one radio resource control (RRC) message from a base station, said at least one RRC message causing in said wireless device: b) receiving, by said wireless device, an activation command to activate said second carrier in said wireless device; c) receiving, by said wireless device, a control command configured to cause transmission of a random access preamble on random access resources of one of said at least one second carrier in said second subset; d) receiving, by said wireless device, a random access response, said random access response comprising a long time alignment value for said second carrier group and a preamble identifier; and e) transmitting, by said wireless device, one or more of said sounding reference signals on said second 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 second carrier until said wireless device receives said random access response comprising said long time alignment value and an uplink grant.