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Sounding reference signal transmission

  • US 8,547,929 B1
  • Filed: 05/22/2013
  • Issued: 10/01/2013
  • Est. Priority Date: 01/25/2012
  • Status: Active Grant
First Claim
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1. 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.

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