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Vertical roaming in wireless networks through improved wireless network cell boundary detection

  • US 20050213542A1
  • Filed: 06/07/2005
  • Published: 09/29/2005
  • Est. Priority Date: 02/28/2003
  • Status: Active Grant
First Claim
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1. A computer-implemented method of wireless network cell boundary detection, comprising:

  • periodically obtaining signal strength samples of wireless network signal strength received at a wireless network interface to a wireless network;

    taking a Discrete Fourier Transform of the received signal strength samples; and

    determining that signal strength received at the wireless network interface is decreasing in the time domain if an imaginary part of a fundamental term of the Discrete Fourier Transform of the received signal strength samples is negative and less than a Fourier-domain threshold.

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