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Data communications system transmitter selection method and apparatus

  • US 4,670,906 A
  • Filed: 08/06/1986
  • Issued: 06/02/1987
  • Est. Priority Date: 04/02/1986
  • Status: Expired due to Term
First Claim
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1. A method for use in a primary station of a communications system communicating message signals via a communications medium between the primary station and a plurality of remote stations located anywhere in a geographical area, said primary station including control means and a plurality of base stations, each base station including transmitting means for transmitting message signals modulated on a first carrier signal and receiving means colocated with the transmitting means for re-eiving message signals modulated on a second carrier signal, and said remote stations including transmitting means for transmitting message signals modulated on the second carrier signal and receiving means for receiving message signals modulated on the first carrier signal;

  • said method for selecting at least one of the base station transmitting means for transmitting message signals to a targe remote station, said method comprising the steps of;

    (a) measuring the signal strength of the carrier signal that is received by any of the base station receiving means from said target remote station during each transmission therefrom;

    (b) computing an estimate of the communications medium path loss between each base station receiving means and said target remote station using the measured signal strength for that base station receiving means;

    (c) computing an estimate of the signal strength receivable at said target remote station from each base station transmitting means using the computed path loss estimate for the base station receiving means colocated with that base station transmitting means; and

    (d) selecting at least one of the base station transmitting means having a computed receivable signal strength estimate that has a magnitude greater than a predetermined receive sensitivity threshold of said target remote station'"'"'s receiving means.

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