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Data transmission installation of the radio network type, and corresponding process

  • US 5,638,449 A
  • Filed: 09/26/1994
  • Issued: 06/10/1997
  • Est. Priority Date: 01/26/1993
  • Status: Expired due to Term
First Claim
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1. A method of data transmission for a data transmission system including at least two data processing stations, each of said data processing stations being equipped with a network interface for communicating by radio in one of a chosen frequency band and a data channel, for emitting messages on request, for collecting messages received, and for establishing confirmative emission or reception orders, said method comprising the steps of:

  • receiving an order confirming emission of a message in one of said data processing stations;

    responding to said order confirming emission of said message in said one of said data processing stations by carrying out in said one of said frequency band and said data channel a rapidly alternating emission/reception according to a chosen pattern peculiar to said one of said data processing stations;

    recognizing a collision if a signal of superior strength to a first threshold strength is received during a substantial part of at least one silence of the rapidly alternating emission/reception, thus demonstrating a concomitant emission by another data processing station; and

    processing said collision if said collision is recognized.

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