Communication system

Abstract

Provided is a communication system capable of suppressing, under communication environment including a plurality of cells, degradation in communication quality and decrease in communication rate and communication capacity due to interference from the other cells. Each of the cells includes a plurality of antenna elements, and performs radio communication with a communication terminal device through the antenna elements. Each of the cells notifies the other cells of settings for measuring channel information on a channel for performing radio communication of its own cell. Each of the cells may notify a communication terminal device being served thereby of the settings for measuring the channel information of its own cell. Here, the communication terminal device measures the channel information based on the settings notified from each of the cells, and reports a result of the measured channel information to a corresponding one of the cells when the result satisfies a predetermined reporting condition.

1 . (canceled) 
     
     
         2 . A communication system comprising a plurality of cells configuring one or more base station devices, a communication terminal device capable of radio communication with each of the cells, and a concentrator capable of radio communication with each of the cells,
 wherein each of the cells notifies the other cells and the communication terminal device of settings for measuring channel information on a channel for performing the radio communication of its own cell,   the communication terminal device measures the channel information based on the settings for measuring the channel information that have been notified from each of the cells, and reports a result of the measured channel information to a corresponding one of the cells, and   when the result of the channel information measured by the communication terminal device satisfies a predetermined condition, each of the cells notifies the concentrator of the result of the channel information measured by the communication terminal device and identification information of the communication terminal device.   
     
     
         3 . A communication system comprising a plurality of cells configuring one or more base station devices, a communication terminal device capable of radio communication with each of the cells, and a concentrator capable of radio communication with each of the cells,
 wherein each of the cells notifies the other cells and the communication terminal device of settings for measuring channel information on a channel for performing the radio communication of its own cell,   the communication terminal device measures the channel information based on the settings for measuring the channel information that have been notified from each of the cells, and reports a result of the measured channel information to a corresponding one of the cells,   each of the cells notifies the concentrator of the result of the channel information measured by the communication terminal device, and   the concentrator derives a precoding weight of the communication terminal device that performs MU-MIMO.   
     
     
         4 . The communication system according to  claim 2 ,
 wherein each of the cells notifies the concentrator of the identification information of the communication terminal device whose result of the measured channel information satisfies a predetermined condition.