Wireless communication terminal and power control method

摘要

Provided is a wireless communication terminal which, when SRSs are simultaneously transmitted between CCs and between antenna ports, avoids increasing the effect of bit rounding errors of D/A converters when the number of antenna ports set for SRS transmission differs between CCs. This device comprises a transmission power calculation unit (107) which calculates the transmission power of a plurality of UL channels of a plurality of CCs and a plurality of antenna ports. A power scaling detection unit (108) detects whether or not the total transmission power of the UL channels exceeds the maximum transmission power specific to a UE. When power scaling is generated, a power scaling control unit (109) uses antenna port setting information set for SRS transmission between CCs to perform power scaling in such a way that all scaling weights are uniform between CCs, or between CCs and between antenna ports.

主权项

1. A radio communication terminal apparatus comprising:
a transmission power calculating section that calculates transmission power of a plurality of uplink channels on a plurality of component carriers of carrier aggregation, and a plurality of antenna ports; a power scaling detecting section that detects whether or not power scaling occurs, by detecting, using the calculated transmission power, whether or not a total value of the transmission power of uplink channels transmitted using the plurality of component carriers and the plurality of antenna ports exceeds maximum transmission power specific to the apparatus; and a power scaling controlling section that performs power scaling when the power scaling detecting section has detected that power scaling occurs, and also when a plurality of reference signals are to be transmitted using antenna ports configured for transmission of reference signals on component carriers, the power scaling being performed in such a way that a total scaling weight considering scaling weights for multiple-antenna transmission becomes equal between the component carriers, or between the component carriers and between the antenna ports, on a basis of the number of antenna ports, or antenna port positions, or antenna port numbers configured for transmission of reference signals on the component carriers; wherein, in the power scaling controlling section, a first scaling weight is equal to 1/A, where A is the number of reference signals to be transmitted using component carriers and antenna ports, the first scaling weight being used among the antenna ports, and the component carriers and the antenna ports being configured for transmission of reference signals.