Patent ID: 8395985

Claim:
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: i) causing configuration of a plurality of carriers comprising a first carrier and at least one second carrier; and ii) comprising: (1) a carrier group index for a second carrier in said at least one second carrier, said carrier group index identifying a second carrier group, said second carrier group being one of a plurality of carrier groups, said second carrier group comprising a second subset of said at least one second carrier; (2) a plurality of second uplink carrier parameters for a second uplink carrier of said second carrier; and (3) a plurality of random access resource parameters identifying random access resources for said second carrier; 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: i) a short time adjustment value, said short time adjustment value range is substantially smaller than said long time adjustment value range; and ii) an index identifying said second carrier group; and 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.