Patent ID: 8547929

Claim:
A method comprising: a) receiving, by a wireless device, at least one control message from a base station, said at least one control message causing in said wireless device: i) configuration of a plurality of cells comprising a primary cell and at least one secondary cell; ii) assignment of each of said at least one secondary cell to a cell group in a plurality of cell groups; and iii) configuration of transmissions of sounding reference signals (SRSs) on a first cell in said plurality of cells, said first cell being assigned to a first cell group in said plurality of cell groups, said SRSs comprising a first SRS and a second SRS; b) transmitting, by said wireless device, said first SRS on said first cell in parallel with transmission of at least one of: i) a first random access preamble in a second cell group different from said first cell group; and ii) a first uplink data packet on a second cell different from said first cell; and c) dropping, by said wireless device, said second SRS in a symbol of a subframe if at least one of the following conditions is satisfied: i) a second random access preamble is transmitted overlapping said symbol in said first cell group; ii) a second uplink data packet is transmitted overlapping said symbol in said first cell; and iii) said wireless device has insufficient power to transmit said second SRS in parallel with other uplink transmissions in said plurality of cells.