POWER HEADROOM REPORTING FOR CARRIER AGGREGATION

摘要

Power headroom reporting and report handling are discussed in the context of a Physical Uplink Shared Channel (PUSCH), on which a user equipment (UE) has no valid uplink grant, and a Physical Uplink Control Channel (PUCCH) on which a UE has no transmission. Under these circumstances, it is not possible to directly calculate one or more parameters which are used to calculate power headroom. Accordingly, exemplary embodiments provide for predetermined, known values to be used by the UE to calculate the power headroom, and by the eNodeB to understand the meaning of a received power headroom report.

主权项

1. A method for power headroom reporting in a radiocommunication system for a component carrier on which a user equipment (UE) has no current transmission on the Physical Uplink Control Channel (PUCCH), the method comprising:
calculating, by said UE, a power headroom for said component carrier on which said UE has no transmission on the PUCCH, using at least one known value for at least one parameter associated with said PUCCH to calculate said power headroom since a value cannot be obtained for said at least one parameter; wherein said at least one known value is a value known by both said UE and an eNodeB to which said UE is connected, wherein said at least one parameter includes at least one of:
(a) hc(nCQI,nHARQ), which represents an amount by which power is adapted to the number of control information bits that are transmitted on said PUCCH on said component carrier when the UE has a transmission on the PUCCH,(b) ΔF—PUCCHc(F), which represents a relative performance difference between PUCCH format 1a and said PUCCH on said component carrier when the UE has a transmission on the PUCCH, and(c) δPUCCHc(i−km), which represents a transmit power control command associated with said PUCCH on said component carrier when the UE has a transmission on the PUCCH; and transmitting, by said UE, a power headroom report based on said calculated power headroom.