Source: http://www.google.com/patents/US8207856?dq=3984803
Timestamp: 2015-03-04 11:52:21
Document Index: 100624292

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

Patent US8207856 - Systems and methods for RFID tag arbitration where RFID tags generate ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA radio frequency identification device (RFID) tag includes a processor, a memory configured to store an identification number that distinguishes the tag from other tags, and a transponder coupled to the memory and the processor. The tag arbitrates by selecting a random number in response to an inventory...http://www.google.com/patents/US8207856?utm_source=gb-gplus-sharePatent US8207856 - Systems and methods for RFID tag arbitration where RFID tags generate multiple random numbers for different arbitration sessionsAdvanced Patent SearchPublication numberUS8207856 B2Publication typeGrantApplication numberUS 13/176,392Publication dateJun 26, 2012Filing dateJul 5, 2011Priority dateJan 30, 2007Also published asUS7973644, US20080180221, US20110260838, WO2008094728A1Publication number13176392, 176392, US 8207856 B2, US 8207856B2, US-B2-8207856, US8207856 B2, US8207856B2InventorsJohn R. TuttleOriginal AssigneeRound Rock Research, LlcExport CitationBiBTeX, EndNote, RefManPatent Citations (102), Non-Patent Citations (89), Referenced by (2), Classifications (13), Legal Events (1) External Links: USPTO, USPTO Assignment, EspacenetSystems and methods for RFID tag arbitration where RFID tags generate multiple random numbers for different arbitration sessions
The Gen 2 standard takes a different approach to generating an inventory. The approach used by the Gen 2 standard, has inventory rounds of 2e slots. Although the word �slot� is used in the specification, it is not really a timeslot. It is more of a counter. The process is illustrated in FIG. 1. At the beginning of each round, each tag sets its respective slot counter 10, 12, 14, 16, 18 to a random number, from 0 to 2e-l. The reader sends a command that starts an inventory process. Any tag whose slot counter is 0 sends a reply; all other tags decrease their slot counter by 1. This process is repeated for all 2e slots. Q is the number of bits, or width of the slot counter. By changing Q, the reader can optimally adjust the number of slots per round to adapt to the number of tags expected to be present. For example, if it is known that there are no more than six tags in a field, there is no need to use a slot counter that is 16 bits wide when 3 bits are sufficient. Thus Q, of the Gen 2 standard, is effectively a mask on the slot counter. Q is similar to the width of the Arbitration Mask described in the above-incorporated Snodgrass and Wood, Jr. patents.
Relevant portions of the Gen 2 specification will now be substantially repeated, to better enable one of ordinary skill in the art to understand the Gen 2 arbitration procedure. According to the Gen 2 specification, the inventory commands that a Gent reader or interrogator use include a �Query� command, a �QueryAdjust� command (described below), a �QueryRep� command (described below), an �ACK� (acknowledge) command, and a �NAK� (no acknowledgement or not acknowledged) command or transmission. The Query command initiates an inventory round and decides which tags participate in an inventory round. A round is a period between successive Query commands.
Also according to the Gen 2 specification, the Query command contains the slot-count parameter Q. Upon receiving a Query command, participating tags pick a random number in the range of 0 to 2e-l, inclusive, and load this value into their slot counter. Tags that pick a zero transition to the reply state and reply immediately. Tags that pick a nonzero value transition to an �arbitrate� state (see FIG. 3) and await a QueryAdjust (described below) or a QueryRep command. Assuming a single tag replies, the following occurs: a) the tag backscatters an RN16 (16 bit random or pseudorandom number) as it enters a reply state, b) the reader acknowledges the tag with an ACK COMMAND containing the same RN16, c) the acknowledged tag transitions to an �acknowledged� state, and backscatters its PC (protocol control data), EPC (electronic product code data that identifies the object to which the tag is or will be attached and distinguishes the tag from other tags) and CRC-16 (cyclic redundancy check), and d) the interrogator issues a QueryAdjust or QueryRep command (not shown), causing the identified tag to invert an �inventoried� flag (i.e., from A to B or B to A) and to transition to a �ready� state, and potentially causing another tag to initiate a query-response dialog with the interrogator, starting in step (a), above. The tag can be considered to be singulated after it is acknowledged.
c) Multiple tags reply. The reader observes a backscattered waveform comprising multiple RN16s. It may try to resolve the collision and issue an ACK; not resolve the collision and issue a Query Adjust, QueryRep, or NAK; or quickly identify the collision and issue a Query Adjust or QueryRep before the collided tags have finished backscattering. In the latter case, the collided tags, not observing a valid reply within the specified time, return to the arbitrate state and await the next Query of Query Adjust command. The Gen 2 arbitration process is also described in connection with a tag state diagram included in the Gen 2 specification, a relevant portion of which is reproduced as FIG. 3. Arbitrate state 30, reply state 32, and acknowledged state 34 correspond to such states as discussed above. FIG. 3 also shows that the term �handle,� as used in the Gen 2 specification, corresponds to an RN16 that a reader uses as a nickname for a tag after a tag has a zero slot value and is acknowledged. Additional details, if desired, can be seen in the Gen 2 specification.
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No. 12/541,882, filed Aug. 14, 2009.89Wright, Jim, "Trends Innovations in RF Identification", SUN Microsystems, Inc., (presentation); 30 pp. (undated).Referenced byCiting PatentFiling datePublication dateApplicantTitleUS8698600 *Sep 1, 2009Apr 15, 2014Mstar Semiconductor, Inc.Method and circuit for accessing RFID tagUS20100073144 *Sep 1, 2009Mar 25, 2010Mstar Semiconductor, Inc.Method and Circuit for Accessing RFID Tag* Cited by examinerClassifications U.S. Classification340/572.1, 340/10.5, 340/3.41, 340/10.1, 340/505, 340/10.2International ClassificationG08B13/14Cooperative ClassificationG06K19/0723, G06K7/0008, G06K7/10356European ClassificationG06K7/00E, G06K19/07T, G06K7/10A8GLegal EventsDateCodeEventDescriptionJul 12, 2013ASAssignmentOwner name: ROUND ROCK RESEARCH, LLC, NEW JERSEYFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:MICRON TECHNOLOGY, INC.;REEL/FRAME:030864/0209Effective date: 20091223RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services