MOBILE TERMINAL DEVICE, RADIO BASE STATION DEVICE, RADIO COMMUNICATION METHOD, AND RADIO COMMUNICATIONS SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a mobile terminal device, radio base station device, and radio communication method capable of sufficiently utilizing effect of both MIMO technology and CoMP technology applied simultaneously.

SOLUTION: A mobile terminal device: estimates a channel state of a downlink by using a reference signal included in each of downlink signals from a plurality of cells; determines a PMI for each cell and inter-cell phase difference information from the channel states of the plurality of cells so that a set of the PMI of each cell and the inter-cell phase difference information is optimum; measures channel quality from the determined PMI and inter-cell phase difference information; and transmits the PMI for each cell, inter-cell phase difference information, and channel quality information to a radio base station device.

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