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Radio communication system having means for avoiding signal collision

  • US 5,042,083 A
  • Filed: 11/05/1986
  • Issued: 08/20/1991
  • Est. Priority Date: 11/05/1985
  • Status: Expired due to Term
First Claim
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1. A radio communication system, comprising;

  • a plurality of communication groups each including a master station and at least one slave station, said communication groups being adapted to use a single common frequency, wherein each said master station includes means for sensing a carrier wave of said common frequency, and means for preventing said master station from transmitting a data signal over said common frequency until said master station has failed to detect said carrier wave for a first predetermined time period, and wherein each said slave station includes means responsive to reception of said data signal for transmitting an acknowledgement signal over said common frequency, within a second predetermined time period from the termination of reception of said data signal, said second predetermined time period being shorter than said first predetermined time period.

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