Radio communication system, user terminal, radio base station apparatus and radio communication method

摘要

The present invention is designed to, upon updating CQIs that are fed back, prevent the increase of the overhead of feedback information, and still improve the accuracy of the updated CQIs when CoMP transmission is applied. The radio communication system of the present invention is formed with a plurality of radio base station apparatuses and a user terminal that is configured to be able to perform coordinated multiple point transmission/reception with the plurality of radio base station apparatuses, and the user terminal acquires channel state information of multiple cells, generates feedback information such that the channel state information of multiple cells is allotted and transmitted in a plurality of subframes, and feeds back the generated feedback information to the radio base station apparatus of one of the multiple coordinated points, using a physical uplink shared data channel.

主权项

1. A radio communication system comprising:
a plurality of radio base station apparatuses, and a user terminal that performs coordinated multiple point transmission/reception with the plurality of radio base station apparatuses, the user terminal comprises:
a processor of the user terminal that generates feedback information such that channel state information of multiple cells is separately allotted to a plurality of subframes; anda transmitter that feeds back the generated feedback information to the radio base station apparatus of one of multiple coordinated points, using a physical uplink shared data channel; and the radio base station apparatus comprises: a processor of the radio base station that updates the channel state information using the channel state information that is allotted in the plurality of subframes and fed back from the user terminal, wherein the processor of the user terminal generates the feedback information in each subframe that includes at least a subset of the channel state information of multiple cells, and wherein the processor of the user terminal generates the feedback information in which at least a channel quality indicator of an entire system band in one cell and a channel quality indicator of a subband of a different cell or Precoding Matrix Indicator (PMI) of the subband of the different cell are arranged in a physical uplink shared data channel in one subframe.