POWER HEADROOM CALCULATION APPARATUS AND A POWER HEADROOM CALCULATION METHOD

摘要

Provided are a base station apparatus and a communication method that can preclude the recognition mismatch in which the reference formats of different UL grants are recognized between a wireless communication terminal apparatus and the base station apparatus by using power headroom (PHR) calculation. For the PHR calculation of a PUSCH in a CC in which no UL grant is present, a UL grant, which was used for calculating the PHR in another CC having the same subframe number as the PUSCH, is used. For example, as to a subframe number=#1, the UL grant of CC #0 is used for calculating the PHR of CC #2 in which no UL grant is present.

主权项

1. A base station apparatus comprising:
a transmitter which, in operation, transmits control information using a Physical Downlink Control Channel (PDCCH) or an higher layer; and a receiver which, in operation, receives transmission power headroom (PHR) information transmitted on an Physical Uplink Shared Channel (PUSCH) after a power headroom of an uplink channel is calculated, at a terminal apparatus which receives the control information, based on parameter information including the transmitted control information and a transmission power of the uplink channel is calculated, at the terminal apparatus, using the parameter information that was used to calculate the power headroom of the uplink channel, wherein the power headroom of the uplink channel corresponds to a power headroom which is calculated when an accumulated value of a Transmit Power Control (TPC) command is zero.