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Uplink power headroom reporting for carrier aggregation

  • US 8,315,320 B2
  • Filed: 12/03/2009
  • Issued: 11/20/2012
  • Est. Priority Date: 12/03/2008
  • Status: Active Grant
First Claim
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1. A method for reporting a carrier-specific power headroom for aggregated carriers, the method comprising:

  • determining a first carrier from a plurality of aggregated carriers that has a physical uplink shared channel (PUSCH) transmission in a subframe i;

    determining a second carrier from the plurality of aggregated carriers that does not have a PUSCH transmission in a subframe i;

    calculating a first power headroom according to the formula;


    PH(k1,i)=PCMAXcarrier(k1)−

    PPUSCH

    UG(k1,i)where k1 is the first carrier, and PPUSCH

    UG(k1,i) is a transmit power for the first carrier in subframe i prior to imposing maximum power limitations; and

    calculating a second power headroom for the second carrier according to the formula;


    PH(k2,i)=PCMAX

    carrier(k2)−

    PPUSCH

    REF(k2,i)where k2 is the second carrier, and PPUSCH

    REF(k2,i) is a transmit power determined according to a reference grant allocation.

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