Patent ID: 9385794
Filing Date: 2016-07-05
CPC Classification: H04B,H04J,H04L

Claim Text:
1. A mobile terminal apparatus comprising: a channel estimation circuit configured to perform channel estimation using a downlink reference signal; a PMI selecting circuit configured to select a PMI (Precoding Matrix Indicator) using a channel estimation value obtained in the channel estimation circuit; an IQI measuring circuit configured to measure an IQI (Interference Quality Indicator) using at least the channel estimation value and the PMI; and a transmission circuit configured to transmit at least the PMI and the IQI to a radio base station apparatus, wherein the base station generates precoding weights using the PMI and the IQI, and performs coordinated multipoint transmission utilizing MIMO transmission using the precoding weights, wherein the IQI measuring circuit obtains the IQI using at least one equation selected from the group of equations consisting of: wherein H F P ICI N: Average noise.