The present invention is related to a beam division multiple access system and
a method thereof. The base station according to the present invention comprises
a initial mobile station information receiver for receiving initial mobile
station information that a mobile station omnidirectionally transmits in an
initial communication step, a mobile station location and speed detector for
detecting a location and a moving speed of the mobile station from the initial
mobile station information, a downlink beam generator for generating a downlink
beam based on the location and the moving speed of the mobile station transferred
from the mobile station location and speed detector, and adjusting at least one
of a width and a direction of each the downlink beam, and a downlink beam transmitter
for transmitting the downlink beam generated by the downlink beam generator
to the mobile station through a phase array antenna.