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Radio communication system

  • US 6,522,898 B1
  • Filed: 05/23/2000
  • Issued: 02/18/2003
  • Est. Priority Date: 05/24/1999
  • Status: Expired due to Term
First Claim
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1. In a radio communication system comprising a base station having a radio communications device that includes a receiving section which weights the amplitude and phase of each of received signals from a plurality of antenna elements, then combines the weighted signals into a composite signal and demodulates the resultant composite signal and a transmitting section which divides a modulated signal into a plurality of transmit signals, then weights the amplitude and phase of each of the transmit signals and radiates each of the weighted transmit signals from a corresponding respective one of the antenna elements, and a plurality of terminal stations each of which performs communications with the base station by radio,each of the terminal stations including transmitting means for, when a communication request occurs in it, transmitting a communication request signal in response to reception of a base station identification signal from the base station;

  • and the base station further comprising;

    weight value storage means for storing a set of amplitude and phase weight values for each of the terminal stations, each set of amplitude and phase weight values being used when a corresponding one of the terminal stations communicates with the base station and the amplitude and phase weight values in each set being determined for each of the antenna elements, and storing scanning amplitude and phase weight values used when the base station scans its associated service area with directional beams to search for a terminal station that makes a request for communications;

    base station identification signal transmitting means for transmitting a base station identification signal via the transmitting section;

    communication request receiving means for receiving the communication request signal transmitted from a terminal station in response to the base station identification signal;

    terminal station identifying means for identifying the requesting terminal station that has transmitted the communication request signal received by the communication request receiving means;

    directivity control means for, when no terminal station to communicate with the base station is specified, controlling the directivity of the transmitting and receiving sections on the basis of the scanning amplitude and phase weight values to cause the base station to scan its associated service area with directional beams and, when a terminal station is specified, fixing the directivity of the transmitting and receiving sections on the basis of the weight values corresponding to that terminal station specified; and

    means for radio communicating with the terminal station specified with the directivity of the transmitting and receiving sections controlled by the directivity control means.

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