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Method of addressing messages and communications

  • US RE41,352 E1
  • Filed: 09/26/2007
  • Issued: 05/25/2010
  • Est. Priority Date: 02/19/1998
  • Status: Expired due to Term
First Claim
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1. A method of establishing wireless communications between an interrogator and wireless identification devices, the method comprising utilizing a tree search technique to establish communications, without collision, between the interrogator and individual ones of the multiple wireless identification devices, the method including using a search tree having multiple nodes respectively representing subgroups of the multiple wireless identification devices, the method further comprising, for a node, transmitting a command, using the interrogator, requesting that devices within the subgroup represented by the node respond, determining with the interrogator if a collision occurred in response to the command and, if not, repeating the command at the same node.

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