Patent ID: 8462688

Claim:
A method comprising: a) transmitting, by a base station configured to communicate employing a plurality of cells, at least one control message to a wireless device in a plurality of wireless devices, said at least one control message: i) configured to cause in said wireless device configuration of at least one secondary cell in said plurality of cells; and ii) comprising: (1) a plurality of common parameters for a secondary cell in said at least one secondary cell, said plurality of common parameters: (a) having the same value for wireless devices in said plurality of wireless devices; and (b) comprising: (i) a plurality of random access resource parameters identifying random access resources; and (ii) a plurality of power control parameters; and (2) a plurality of dedicated parameters: (a) specific to said wireless device; and (b) comprising: (i) a cell group index for said secondary cell, said cell group index identifying one of a plurality of cell groups, said plurality of cell groups comprising a primary cell group and a secondary cell group; and (ii) a time alignment timer parameter for each cell group in said plurality of cell groups; b) transmitting, by said base station, a control command configured to cause transmission of a random access preamble on said random access resources of said secondary cell in said secondary cell group, transmission power of said random access preamble calculated employing at least one of said plurality of power control parameters; and c) transmitting, a random access response on a primary cell in said primary cell group, said random access response comprising a timing advance command for said secondary cell group comprising said secondary cell; and wherein: i) said timing advance command comprises a time adjustment value; ii) uplink signals transmitted by said wireless device in said secondary cell group employ a second synchronization signal as a second timing reference; and iii) said timing advance command configured to cause substantial alignment of reception timing of said uplink signals in frames and subframes of said secondary cell group at said base station.