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Secure localization for 802.11 networks with fine granularity

  • US 8,107,400 B2
  • Filed: 07/14/2008
  • Issued: 01/31/2012
  • Est. Priority Date: 07/13/2007
  • Status: Active Grant
First Claim
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1. A method of localizing mobile client devices within a geographical area, comprising:

  • a) having an Access Point Controller generate tokens and provide the tokens to a plurality of Access Points within a geographical area;

    b) having the Access Points transmit said tokens for receipt by client devices within said geographical area;

    c) having at least one client device within said geographical area inform the Access Point Controller of the tokens that it receives from the Access Points; and

    d) having the Access Point Controller determine a Macro-Location of the client device based on the tokens received by the client device;

    e) having the Access Point Controller generate new tokens for transmission to a plurality of computers distributed at least within the Macro-Location within said geographical area to wirelessly transmit to said client device;

    f) having the client device inform the Access Point Controller of the new tokens that it receives from the computers distributed within said geographical area; and

    g) having the Access Point Controller determine a Pico-Location of the client device based on the new tokens received by the client device.

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