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Method and system for transmitting signals using frequency hopping

  • US 20050118954A1
  • Filed: 01/03/2002
  • Published: 06/02/2005
  • Est. Priority Date: 01/03/2002
  • Status: Active Grant
First Claim
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1. Method of transmitting signals, e.g. control signals, request signals, interrogation signals etc. in a control system comprising at least two units, wherein at least one of said units is designed to operate as a master unit and wherein at least one of said units is designed to operate as a slave unit, whereby a plurality of channels may be used for the transmission, whereby a master unit performs the steps of detecting a vacant channel and transmitting a signal via said vacant channel, and whereby said at least one slave unit performs the step of scanning the channels for transmitted signals, wherein said signal transmitted by said master unit comprises a preamble having a length corresponding at least to the time required for said at least one slave unit to test said channels for a transmitted signal, and wherein said at least one slave unit performs the step of testing said channels for a transmitted signal by testing said preamble for a predefined characteristic, e.g. a symbol, a bit sequence etc., said predefined characteristic comprising system specific information indicating to the slave unit that the message originates from a master unit related to the same system.

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