Patent ID: 9232428
Filing Date: 2016-01-05
CPC Classification: H04W

Claim Text:
1. An aperiodic channel state information reporting method comprising the steps of: transmitting in advance, from a radio base station apparatus to a user terminal, channel state measurement target information having information about presence or absence of reporting of channel state information and a subframe as a measurement target associated with trigger bit information indicating information about presence or absence of reporting of channel state information and a component carrier as a measurement target; and reporting channel state information of the subframe and the component carrier designated by the trigger bit information transmitted on a downlink control channel, to the radio base station apparatus on an uplink shared channel, wherein the radio base station apparatus generates a bitmap pattern as the information about the subframe as the measurement target of the channel state information, wherein in a heterogeneous network having a network configuration where a macro cell and a micro cell smaller than the macro cell overlay each other, the radio base station apparatus is a micro base station apparatus provided in the micro cell and transmits the channel state measurement target information in advance to the user terminal located in the micro cell, and wherein the radio base station apparatus generates the bitmap pattern in accordance with information including transmission stopped subframes from a macro base station apparatus provided in the macro cell.