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Transmitting and receiving method, in particular for detection of an ID transmitter

  • US 20030016140A1
  • Filed: 09/09/2002
  • Published: 01/23/2003
  • Est. Priority Date: 03/09/2000
  • Status: Active Grant
First Claim
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1. A method for transmitting and receiving signals between at least one first transmitting and receiving device and at least one further transmitting and receiving device, in particular for unlocking and/or locking a vehicle, a) with the presence of the further transmitting and receiving device being monitored by the first transmitting and receiving device by means of a bidirectional first communication path, b) the first transmitting and receiving device transmitting a request signal via the first communication path on detection of the further transmitting and receiving device of this further transmitting and receiving device, c) a second communication path being set up for a predetermined time interval between the first and the further transmitting and receiving device as a function of this request signal, and d) the reception power level in the further transmitting and receiving devices being measured by means of a measurement device.

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