Patent ID: 6483819
Filing Date: 2002-11-19
Classification: H04B,H04W

Abstract:
A radio communication system, comprising:a plurality of mobile communication stations and a base station, said base station and said plurality of mobile communication stations being communicatively coupled through radio communication channels, said base station including a digital beam forming (DBF) antenna for providing a space-division multiple access method to said mobile communication stations by forming beams having different directions for mobile communication stations at diverse locations from each other, wherein each beam is directed to a particular mobile communication station location and has the same frequency as all other beams formed by said DBF antenna; detection means for detecting whether any of said plurality of mobile communication stations are located with respect to each other at a distance less than a minimum distance required for space-division multiple access to function properly; and change-over means for causing mobile communication stations detected to be located at less than said minimum distance with respect to each other to switch from said space-division multiple access method to an alternate multiple access method, and causing said base station to communicate with said detected mobile communication stations using said alternate multiple access method.