Source: http://www.google.com/patents/US7639638?dq=%22Meaning-based+advertising+and+document+relevance+determination%22
Timestamp: 2014-08-23 01:40:36
Document Index: 493315845

Matched Legal Cases: ['art 3', 'art 4', 'art 1', 'art 2', 'art 1', 'art 3', 'art 3', 'art 2', 'art 3', 'art 3']

Patent US7639638 - Method and apparatus for an arbitration scheme for radio frequency ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign in<nobr>Advanced Patent Search</nobr>PatentsRFID tags are identified. In one embodiment, RFID tags may be chosen to respond to an interrogator in accordance with an arbitration scheme. According to one arbitration scheme, each chosen tag may randomly pick a slot value. The interrogator may indicate that the number of slot values is to be adjusted....http://www.google.com/patents/US7639638?utm_source=gb-gplus-sharePatent US7639638 - Method and apparatus for an arbitration scheme for radio frequency identification devicesAdvanced Patent SearchPublication numberUS7639638 B2Publication typeGrantApplication numberUS 11/416,846Publication dateDec 29, 2009Filing dateMay 2, 2006Priority dateFeb 19, 1998Fee statusPaidAlso published asDE69938655D1, EP1072128A1, EP1072128B1, US6275476, US7315522, US7672260, US7760677, US7936706, US8040829, US8488581, US8634338, US8638709, US20010014090, US20050207364, US20060056325, US20060209781, US20080007412, US20080042806, US20090322491, US20120265584, US20120271683, US20130073348, WO1999043127A1Publication number11416846, 416846, US 7639638 B2, US 7639638B2, US-B2-7639638, US7639638 B2, US7639638B2InventorsClifton W. Wood, Jr.Original AssigneeKeystone Technology Solutions, LlcExport CitationBiBTeX, EndNote, RefManPatent Citations (99), Non-Patent Citations (99), Referenced by (1), Classifications (26), Legal Events (5) External Links: USPTO, USPTO Assignment, EspacenetMethod and apparatus for an arbitration scheme for radio frequency identification devicesUS 7639638 B2Abstract RFID tags are identified. In one embodiment, RFID tags may be chosen to respond to an interrogator in accordance with an arbitration scheme. According to one arbitration scheme, each chosen tag may randomly pick a slot value. The interrogator may indicate that the number of slot values is to be adjusted. Each chosen tag may respond to the interrogator with a random number.
5. The method of claim 4, wherein the third command comprises a mask, the mask to be used to select a portion of an identification number stored in each of the plurality of wireless identification devices for comparison to a value, the mask being �0� such that no portion of the identification number is selected.
CROSS REFERENCE TO RELATED APPLICATION This is a continuation of U.S. patent application Ser. No. 09/820,467, filed Mar. 28, 2001, now U.S. Pat. No. 7,315,522 by inventor Clifton W. Wood, Jr., entitled �Method of Addressing Messages and Communications System�, which in turn is a continuation of U.S. patent application Ser. No. 09/026,248, filed Feb. 19, 1998, now U.S. Pat. No. 6,275,476, both of which are incorporated herein by reference.
The interrogator sets AVALUE to 0000 (or all �don't care�, indicated by the character �X� in FIG. 4) and AMASK to 0000. The interrogator transmits a command to all devices 12 requesting that they identify themselves. Each of the devices 12 evaluate (AMASK & AVALUE)==(AMASK & RV) using the random value RV that the respective devices 12 selected. If the equation evaluates to �1,� (TRUE), then the device 12 will reply. If the equation evaluates to �0� (FALSE), then the device 12 will not reply. In the first level of the illustrated tree, AMASK is 0000 and anything bitwise ANDed with all zeros results in all zeros, so both the devices 12 in the field respond, and there is a collision.
The symbol �<<� represents a bitwise left shift. �<<1� means shift left by one place. Thus, 0001<<1 would be 0010. Note, however, that AMASK is originally called with a value of zero, and 0000<<1 is still 0000. Therefore, for the first recursive call, AMASK=(AMASK <<1)+1. So for the first recursive call, the value of AMASK is 0000+0001=0001. For the second call, AMASK=(0001<<1)+1=0010+1=0011. For the third recursive call, AMASK=(0011<<1)+1=0110+1=0111.
This sequence of AMASK, AVALUE binary numbers assumes that there are collisions all the way down to the bottom of the tree, at which point the Identify command sent by the interrogator is finally successful so that no collision occurs. Rows in the table for which the interrogator is successful in receiving a reply without 3 collision are marked with the symbol �*�. Note that if the Identify command was successful at, for example, the third line in the table then the interrogator would stop going down that branch of the tree and start down another, so the sequence would be as shown in the following table.
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No. 11/865,584, filed Oct. 1, 2007.99Wright, Jim, "Trends and Innovations in RF Identification", SUN Microsystems, Inc., (presentation); 30 pp. (Mar. 2005).Referenced byCiting PatentFiling datePublication dateApplicantTitleUSRE43382Feb 7, 2010May 15, 2012Round Rock Research, LlcMethod of addressing messages and communications systemsClassifications U.S. Classification370/312, 340/10.1, 370/445, 370/346International ClassificationH04L12/413, H04B7/00, H04J3/16, H04Q5/22, H04L12/56, G06K7/00Cooperative ClassificationH04W24/00, H04W74/06, H04W74/08, G06K7/10019, H04W8/26, H04L61/2092, H04L29/1232, H04W40/246, H04W76/021, G06K7/0008European ClassificationG06K7/10A1, H04W74/06, H04L29/12A3I, H04L61/20I, G06K7/00E, H04W76/02ALegal EventsDateCodeEventDescriptionMay 29, 2013FPAYFee paymentYear of fee payment: 4Nov 9, 2010CCCertificate of correctionJan 26, 2010ASAssignmentOwner name: MICRON TECHNOLOGY, INC.,IDAHOFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:KEYSTONE TECHNOLOGY 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