Uplink power headroom reporting for carrier aggregation
First Claim
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1. A method comprising:
- determining, via a wireless transmit/receive unit (WTRU), a carrier that does not have a physical uplink shared channel (PUSCH) transmission in a subframe i from a plurality of aggregated carriers; and
calculating, via the WTRU, a power headroom for the carrier according to the formula;
PH(k,i)=PCMAX_carrier(k)−
PPUSCH_REF(k,i)where PH(k,i) is the power headroom for the carrier, k is a carrier number, PCMAX_carrier(k) is a maximum power for the carrier, and PPUSCH_REF(k,i) is a transmit power determined according to a reference grant allocation.
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Abstract
A method for reporting power headroom is disclosed. Power headroom may be reported across all carriers (wideband), for a specific carrier, or for a carrier group. The formula used to calculate the power headroom depends on whether the carrier (or a carrier in the carrier group) has a valid uplink grant. If the carrier or carrier group does not have a valid uplink grant, the power headroom may be calculated based on a reference grant. The power headroom is calculated by a wireless transmit/receive unit and is reported to an eNodeB.
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Citations
26 Claims
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1. A method comprising:
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determining, via a wireless transmit/receive unit (WTRU), a carrier that does not have a physical uplink shared channel (PUSCH) transmission in a subframe i from a plurality of aggregated carriers; and calculating, via the WTRU, a power headroom for the carrier according to the formula;
PH(k,i)=PCMAX_carrier(k)−
PPUSCH_REF(k,i)where PH(k,i) is the power headroom for the carrier, k is a carrier number, PCMAX_carrier(k) is a maximum power for the carrier, and PPUSCH_REF(k,i) is a transmit power determined according to a reference grant allocation. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for comprising:
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determining, via a wireless transmit/receive unit (WTRU), a carrier that does not have a physical uplink shared channel (PUSCH) transmission in a subframe from one or more aggregated carriers; determining, via the WTRU, a maximum power for the carrier; and calculating, via the WTRU, a power headroom for the carrier using the maximum power for the carrier and a reference grant. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
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16. A wireless transmit/receive unit (WTRU) comprising:
a processor configured to; determine a carrier that does not have a physical uplink shared channel (PUSCH) transmission in a subframe from one or more aggregated carriers; calculate a maximum power for the carrier; and calculate a power headroom for the carrier using the maximum power for the carrier and a reference grant. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
Specification