Patent ID: 7639984
Filing Date: 2009-12-29
Classification: H04B,H04W

Abstract:
1. A wireless communication system comprising: a plurality of remote base stations for transmitting and receiving wireless signal with a plurality of mobile stations; a central base station connected with the plurality of remote base stations, for transmitting signals from the plurality of mobile stations through the plurality of remote base stations to a network side and receiving signals for the plurality of mobile stations from the network side, and performing scheduling of transmitting signals to the plurality of mobile stations; wherein each of the plurality of the remote base stations comprising a direction-variable antenna of which directivity varies with an electric signal supplied to a plurality of antenna elements; and the central base station comprising: a mobile-stations management table which stores an identification and an area information of a remote base station in which each mobile station is placed, and the allocation priority level of the mobile station to communication, for all of the plurality of remote base stations connected with the central base station; an interference evaluation table which stores a plurality of area informations causing interference with a certain area of a certain remote base station corresponding to each area of a remote base station, for all of the plurality of remote base stations connected with the central base stations; and a scheduling controller for referencing the interference evaluation table in accordance with allocation priority information of each of the mobile stations stored in the mobile-station assignment table, and performing scheduling of transmitting signal to each of the mobile stations so that interference of radio waves sent from each of the remote base stations to each of the mobile stations can be suppressed, a weight control unit for selecting a weight coefficient to be given to the direction-variable antenna of each of the plurality of remote base stations, based on information from the scheduling controller, so that the corresponding remote base station forms beam according to scheduling result, wherein the plurality of remote base stations and the central base station have an optic-to-electric converter and an electric-to-optic converter, in which the central base station and the plurality of remote base stations are connected by a fiber-optic cable, and signal from each of the plurality of mobile stations and the weight coefficient transmitted from the central base station to the plurality of remote base stations are transmitted or received through the fiber-optic cable, so as to determine directionality of the direction-variable antenna by the scheduling result in real time and control interference between the plurality of mobile base stations.