WIRELESS BASE STATION, USER TERMINAL, WIRELESS COMMUNICATION METHOD, AND WIRELESS COMMUNICATION SYSTEM

摘要

The purpose of the present invention is to inhibit the decline in through-put, and to reduce the overhead of a CSI feedback when applying a CoMP transmission. A wireless base station configured to be able to perform coordinated multipoint transmission/reception with regard to a user terminal, the wireless base station having a determination unit for determining a retransmission control signal that is fed back from the user terminal, and a CQI update unit for updating a CQI for coordinated multipoint transmission/reception by using the reception quality information in each cell, wherein the CQI update unit updates the CQI by using a calculation formula delimited by the reception quality information in each cell and a variable of which the numerical value changes in accordance with the content of the retransmission control signal.