Application Number: 00102785
Application Date: 2000.02.22
Publication Number: 1264965
Publication Date: 2000.08.30
Priority Information: 1999/2/22 JP 043189/1999
International: H01Q3/26;H04B7/26
Applicant(s) Name: NEC Corp.
Address:
Inventor(s) Name: Takai Kenichi
Patent Agency Code: 11021
Patent Agent: zhu jingui
Abstract An adaptive antenna directivity control method and a system therefor is capable of reducing interference in an up-link and/or a down-link upon initiation of handoff to improve communication quality upon initiation of handoff to speed-up directivity control. Respective transmission signal or reception signal of a plurality of antenna elements of the base station are varied in amplitude and phase for combining in a particular orientation for establishing a directivity by a radiation pattern by combining. The method includes initiating soft handoff in the mobile station, obtaining an installation position information from a first base station which is connected before handoff and directivity information of an up-link of the first base station relative to the mobile station, predicting an orientation of the 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 determining an initial directivity control parameter of the up-link corresponding to obtained orientation of the mobile station.