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Method and system for enabling device functions based on distance information

  • US 7,574,219 B2
  • Filed: 04/12/2005
  • Issued: 08/11/2009
  • Est. Priority Date: 05/26/2000
  • Status: Expired due to Fees
First Claim
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1. A method of enabling device functions in a local device using timing information, the method including:

  • transmitting a message from the local device to a primary remote device via an ultra wide band (UWB) wireless medium;

    receiving at the local device a response transmitted from the primary remote device via the UWB wireless medium;

    determining a primary time period between a first time for the transmitting the message and a second time for the receiving the response;

    determining a primary distance from the local device to the primary remote device based on the primary time period;

    selectively enabling communications between the local device and the primary remote device based on the primary distance.

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