Patent ID: 9351177
Filing Date: 2016-05-24
CPC Classification: H04B,H04W

Claim Text:
1. A mobile terminal apparatus with a processor comprising: an estimation section that estimates channel states of a plurality of cells using reference signals included in downlink signals from the plurality of cells; a determining section that determines a PMI (Precoding Matrix Indicator) of each cell and inter-cell phase difference information, from the channel states of the plurality of cells; a measurement section that measures channel quality from the PMIs and inter-cell phase difference information determined in the determining section; and a transmission section that transmits the PMI of each cell, the inter-cell phase difference information and information about the channel quality, to a radio base station apparatus, wherein the determining section determines the PMI of a serving cell from a channel state of the serving cell, and determines the combinations of the PMIs of other cells than the serving cell and the inter-cell phase difference information from the channel states of the plurality of cells and the PMI of the serving cell, such that throughput or received SINR (Signal to Interference and Noise Ratio) is maximized; and wherein the determining section determines the PMI of the serving cell using the following equation 10, and determines the PMIs of the other cells and the inter-cell phase difference information using the following equations 11: where where