Patent ID: 6862462
Filing Date: 2005-03-01
Classification: H01Q,H04W

Abstract:
1. A directivity control apparatus comprising: reception means for receiving signals from a plurality of radio terminals; transmission means for transmitting signals to the radio terminals; direction determination means for determining directions of the radio terminals viewed from said transmission means on the basis of the signals received by said reception means; group selection means for distributing, by using a threshold, transmission powers or downlink data transmission rates of radio terminals which transmit signals in a time-overlapping manner, thereby classifying the radio terminals into two groups, and then selecting a group having a smaller total number of radio terminals; and directivity pattern control means for controlling a directivity pattern on the basis of the directions of the radio terminals determined by said direction determination means so as to increase intensity of radio waves to a target transmission radio terminal and decrease the intensity of radio waves to other radio terminals which transmit signals in the time-overlapping manner and belong to a group selected by said group selection means.