MOBILE COMMUNICATION BASE STATION DEVICE AND ITS RADIATION DIRECTIVITY CONTROL METHOD

摘要

PROBLEM TO BE SOLVED: To reduce the interference given from an adjacent base station and to obtain an antenna having the even directivity in regard to a terminal by setting the main beam directions of the antennas which are connected to the k-th and following positions toward the direction where the gains of synthetic directivity connected to the 1st to (k-1)th transmitting/receiving devices are lowered and also setting the lower gain of the k-th antenna toward the direction of the k-th interference wave. SOLUTION: The interference wave sent from an adjacent station 1 arrives in the lower gain direction of the radiation directivity of an antenna 1 and accordingly the influence of the interference wave can be reduced in this direction. If a terminal is located in the direction where the gain is lowered to a main beam, the communication quality is deteriorated. Meanwhile, the radiation directivity of an antenna 2 exists in the direction of the station 1 and the communication is made possible via the antenna 2 despite an uncommunicatable antenna 1. Then a talking area can be extended as much as possible via the antenna of the station 1 when the radiation directivity is secured so as to obtain a main beam that compensates the lowered gain part of the antenna 2 by an antenna 3.