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Method of addressing messages and communications system
| Details |
Inventors: Wood, Jr., Clifton W.;
Assignee: Micron Technology, Inc. (Boise, ID)
Primary Examiner: Patel; Ajit
Assistant Examiner:
Attorney, Agent or Firm: Wells, St. John, Roberts, Gregory & Matkin, P.S.
A method of establishing wireless communications between an interrogator and individual ones of multiple wireless identification devices, the method 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 node. |
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DETAILED DESCRIPTION The invention provides a wireless identification device configured to provide a signal to identify the device in response to an interrogation signal.
One aspect of the invention provides a method of establishing wireless communications between an interrogator and individual ones of multiple wireless identification devices.
The method comprises 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 is defined for the tree search method.
The tree has multiple nodes respectively representing subgroups of the multiple wireless identification devices.
The interrogator transmits a command at a node, requesting that devices within the subgroup represented by the node respond.
The interrogator determines if a collision occurs in response to the command and, if not, repeats the command at the same node.
Another aspect of the invention provides a communications system comprising an interrogator, and a plurality of wireless identification devices configured to communicate with the interrogator in a wireless fashion.
The interrogator is configured to employ tree searching 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.
The interrogator is configured to follow a search tree, the tree having multiple nodes respectively representing subgroups of the multiple wireless identification devices.
The interrogator is configured to transmit a command at a node, requesting that devices within the subgroup represented by the node respond.
The interrogator is further configured to determine if a collision occurs in response to the command and, if not, to repeat the command at the same node
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Multiplexer-related 
