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Frequency hopping spread spectrum data communications system

  • US 5,386,435 A
  • Filed: 10/29/1993
  • Issued: 01/31/1995
  • Est. Priority Date: 10/15/1992
  • Status: Expired due to Term
First Claim
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1. In a radio frequency data communication system of the type comprising at least one base station and a plurality of terminals, said system employing a media access protocol of the type that defines a plurality of discrete time slots generated locally at each of said plurality of terminals and at said base station, the improvement comprising in combination therewith:

  • a frequency hopping spread spectrum transmitter at said base station for transmitting an information signal for a predetermined hop period on each of a predetermined plurality of career frequencies in a predetermined sequence;

    a first interval within each hop period and subsequent to transmission of said information signal, wherein during said first interval said base station transmits outgoing messages addressed to specific terminals, said messages being of variable duration; and

    a second interval within at least one of said hop periods, subsequent to said first interval, wherein during said second interval any of said terminals may transmit messages intended for said base station using a contention-free, discrete time slotted protocol.

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