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System for locating a mobile unit

  • US 7,477,904 B2
  • Filed: 07/16/2003
  • Issued: 01/13/2009
  • Est. Priority Date: 07/31/2002
  • Status: Expired due to Term
First Claim
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1. A system for locating a mobile unit including:

  • means for transmitting a first signal at a relatively high power, from an access point;

    means for transmitting a second signal at a predetermined, relatively low power, from said access point;

    means for receiving said first signal, at a mobile device;

    means for determining a first signal strength of said first signal at said means for receiving said first signal;

    means for determining whether said first signal strength exceeds a relatively low threshold level so as to determine whether service may be provided;

    means for receiving said second signal, at said mobile device;

    means for determining a second signal strength of said second signal received at said means for receiving said second signal;

    means for determining whether said second signal strength exceeds a relatively high threshold level so as to locate the mobile unit within a known distance of said means for transmitting said second signal.

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