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PERSONAL EMERGENCY RESPONSE (PER) SYSTEM

  • US 20110181422A1
  • Filed: 03/21/2011
  • Published: 07/28/2011
  • Est. Priority Date: 06/30/2006
  • Status: Active Grant
First Claim
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1. A method of operating a base unit in a building indoor location determination system, comprising:

  • communicating with a wearable tag through the base unit;

    estimating a location of the wearable tag based on times of arrival of signals; and

    determining if a fall has occurred and requesting help through the base unit.

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