The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 27, 2003
Filed:
Feb. 18, 2000
Kenichi Takai, Saitama, JP;
NEC Corporation, Tokyo, JP;
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 resulting in increasing of channel capacity. In the adaptive antenna directivity control method, a mobile station and base station to be connected with the mobile station in radio through an up-link and a down-link are governed by a supervisory station. 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 step of initiating soft handoff in the 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 the first base station relative to the mobile station, step of 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 step of determining an initial directivity control parameter of the up-link corresponding to obtained orientation of the mobile station.