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:
Oct. 15, 1996
Filed:
Dec. 13, 1994
Toshihito Kanai, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
In a cellular mobile telecommunications system, a radio link control method provides each base station with an antenna whose directivity is adaptively controllable on a mobile station basis. The base station communicates with a plurality of mobile stations by using the same frequency at the same time. The base station selects, among transmitters/receivers thereof which are in communication, two transmitters/receivers using the same frequency, detects the main beam directions of antenna directivities thereof, and then compares a difference between the main beam directions and a predetermined threshold. If the former is smaller than the latter, the base station executes handover so as to replace the frequency being used by one of the transmitters/receivers with another frequency. The method allows a single base station to use the same frequency twice or more while preventing interference from occurring within the base station.