Multiplex communications – Communication over free space – Combining or distributing information via time channels
Reissue Patent
2011-08-09
2011-08-09
Patel, Ajit (Department: 2617)
Multiplex communications
Communication over free space
Combining or distributing information via time channels
Reissue Patent
active
RE042599
ABSTRACT:
A method of establishing wireless communications between an interrogator and individual ones of multiple wireless identification devices, the methoddelete-start id="REI-00001" date="20110809" ?comprising utilizing a tree search method to attempt to identify individual ones of the multiple wireless identification devices so as to be able to perform communications, without collision, between the interrogator and individual ones of the multiple wireless identification devices, a search tree being defined for the tree search method, the tree having multiple nodes respectively representing subgroups of the multiple wireless identification devices, wherein the interrogator transmits a command at a node, requesting that devices within the subgroup represented by the node respond, wherein the interrogator determines if a collision occurs in response to the command and, if not, repeats the command at the same node. An interrogator configured to transmit a command at a node, requesting that devices within the subgroup represented by the node respond, the interrogator further being configured to determine if a collision occurs in response to the command and, if not, to repeat the command at the same nodedelete-end id="REI-00001" ?insert-start id="REI-00002" date="20110809" ?includes: receiving a first signal from an interrogator in accordance with an algorithm to identify a radio frequency identification (RFID) device in a field of the interrogator, the first signal comprising a first set of bits and requesting a response from one or more RFID devices in the field selected in accordance with at least the first set of bits; responsive to receiving the first signal, determining if the first set of bits is equal to a first portion of an identifier of the RFID device, and, if so, modulating a radio frequency (RF) field, provided by the interrogator, to communicate a reply to the interrogator in accordance with the algorithm and receiving, in accordance with the algorithm, a retransmission of the first signal from the interrogator in response to the interrogator receiving the reply without detecting a collisioninsert-end id="REI-00002" ?.
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Gazdzinski & Associates, PC
Patel Ajit
Round Rock Research, LLC
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