Patent ID: 8315320

Claim:
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 ( k 1 ,i )= P CMAX carrier ( k 1 )− P PUSCH — UG ( k 1 ,i ) where k 1 is the first carrier, and P PUSCH — UG (k 1 ,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 ( k 2 ,i )= P CMAX — carrier ( k 2 )− P PUSCH — REF ( k 2 ,i ) where k 2 is the second carrier, and P PUSCH — REF (k 2 ,i) is a transmit power determined according to a reference grant allocation.