Patent ID: 8395985
Filing Date: 2013-03-12
Classification: H04L,H04W

Abstract:
1. A method comprising: a) receiving, by a wireless device, at least one radio resource control message from a base station, said at least one radio resource control message: b) receiving, by said wireless device from said base station, a control command causing said wireless device to transmit a random access preamble on said second uplink carrier, said control command comprising a preamble index corresponding to said random access preamble; c) transmitting, by said wireless device, said random access preamble on said random access resources on said second uplink carrier, transmission timing of said random access preamble being determined, at least in part, by employing a synchronization signal transmitted on one of at least one downlink carrier in said second carrier group, uplink transmissions in said second carrier group employing said synchronization signal as timing reference; d) receiving, by said wireless device, a long time alignment command on said first carrier in response to said random access preamble transmission, said long time alignment command comprising said preamble index and a long time adjustment value; e) receiving, by said wireless device, at least one short time alignment command from said base station, said short time alignment command comprising: f) applying, by said wireless device, said short time adjustment value to uplink signals transmitted on all activated uplink carriers in said second carrier group such that said base station receives substantially aligned uplink signals in frames and subframes of said second carrier group.