| 摘要 |
<P>PROBLEM TO BE SOLVED: To feed back a PMI necessary for precoding weight generation in downlink MIMO transmission using a plurality of transmission antennas while improving throughput characteristics. <P>SOLUTION: This feedback method in an LTE-A system feeds back a PTI (Precoder Type Indicator) included in a physical uplink control channel to a radio base station device for downlink MIMO transmission using a plurality of transmission antennas. The method includes the step of multiplexing feedback information corresponding to a report 3 when a PTI value is 0 to only a part of a sub-frame, and the step of transmitting the multiplexed signal to the radio base station device through the physical uplink control channel, in a mobile terminal device. When selecting an RI being different from the RI fed-back lastly, the PTI value should be chosen to be 0. The PTI and the RI after the change are multiplexed to the sub-frame, and the multiplexed signal is transmitted to the radio base station device through the physical uplink control channel. <P>COPYRIGHT: (C)2012,JPO&INPIT |
