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System and method for updating location information for distributed communication devices

  • US 6,597,915 B2
  • Filed: 12/18/2001
  • Issued: 07/22/2003
  • Est. Priority Date: 12/18/2001
  • Status: Active Grant
First Claim
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1. A method of updating location information for communication devices that are spatially distributed, the method comprising the steps of:

  • at each of a plurality of communication devices and at multiple instances over a period of time, alternatively operating in first, second, and third distinct modes, wherein the first mode comprises sleeping for a particular period of time, the second mode comprises waking up and performing a particular function, and the third mode comprises communicating with others of the plurality of communication devices and collecting and storing location determining information; and

    updating location information for selected devices of the plurality of communication devices device based on location determining information collected by at least one of the plurality of communication devices over multiple instances of operation in the third mode.

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