Patent ID: 6571097
Filing Date: 2003-05-27
Classification: H04B,H04W

Abstract:
An adaptive antenna directivity control method where a mobile station and base station to be connected with said mobile station in radio through an up-link and a down-link being governed by a supervisory station, respective transmission signal or reception signal of a plurality of antenna elements of said base station being varied in amplitude and phase for combining in a particular orientation for establishing a directivity by a radiation pattern by combining, comprising:step of initiating soft handoff in said mobile station; step of obtaining an installation position information from a first base station which is connected before handoff and directivity information of an up-link of said first base station relative to said mobile station; step of predicting an orientation of said mobile station from own station by a second base station to be connected by handoff on the basis of the directivity information of the up-link; and step of determining an initial directivity control parameter of the up-link corresponding to obtained orientation of said mobile station.