MOBILE TERMINAL APPARATUS AND RADIO BASE STATION APPARATUS

摘要

Provided are a mobile terminal apparatus and a radio base station apparatus wherein even if there exists a control delay, an optimum feedback parameter is used to transmit a downstream signal, thereby improving the throughput characteristic of a downstream channel.  A mobile terminal apparatus (1) uses a received signal to determine a feedback parameter to be used for a radio base station apparatus (3), thereby acquiring a feedback value.  The mobile terminal apparatus (1) then predicts a feedback parameter to be used after a control delay in which the acquired feedback value is reflected on the transmission over a downstream shared channel, thereby acquiring a feedback predicted value.  The mobile terminal apparatus (1) then transmits the feedback predicted value to the radio base station apparatus.  The radio base station apparatus (3) uses the feedback predicted value to select a precoding weight of a MIMO channel transmission and also uses the feedback predicted value to schedule the downstream shared channel.