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:
Nov. 19, 2002
Filed:
Mar. 12, 1999
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
The present invention provides a radio communication system and a method thereof, which successively use the same frequency even when a plurality of mobile stations served by the same base station move and come close with one another and a space-division access system becomes unavailable which uses an antenna beam forming function of the base station. In the system, an access system switching unit is periodically started, and it initially clears the existing group relationships in a mobile station tracking-information table. The unit then examines the table and compares a difference of the directional angles of respective mobile stations with a predetermined threshold level. If the directional angles show a difference, the unit continues the examination with respect to other combinations of the mobile stations. If the difference is smaller than the threshold, the associated two mobile stations are grouped. After comparing adjacency of all combinations of the mobile stations, baseband units of the base station and each mobile station are instructed to change the access system of the grouped mobile stations from the space-division access system to a time-division access system.