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[0016]One aspect of the invention provides a radio frequency identification device comprising an integrated circuit including a receiver, a transmitter, and a microprocessor. In one embodiment, the integrated circuit is a monolithic single die single metal la
Problems solved by technology
As large numbers of objects are moved in inventory, product manufacturing, and merchandising operations, there is a continuous challenge to accurately monitor the location and flow of objects.
However, such identification systems are only capable of operation over a relatively short range, limited by the size of a magnetic field used to supply power to the devices and to communicate with the devices.
When the interrogator sends a message to a transponder device requesting a reply, there is a possibility that multiple transponder devices will attempt to respond simultaneously, causing a collision, and thus causing an erroneous message to be received b
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[0024]This disclosure of the invention is submitted in furtherance of the constitutional purposes of the U.S. Patent Laws “to promote the progress of science and useful arts” (Article 1, Section 8).
[0025]FIG. 1 illustrates a wireless identification device 12 in accordance with one embodiment of the invention. In the illustrated embodiment, the wireless identification device is a radio frequency data communication device 12, and includes RFID circuitry 16. In the illustrated embodiment, the RFID circuitry is defined by an integrated circuit as described in the above-incorporated patent application Ser. No. 08 / 705,043, filed Aug. 29, 1996 and now U.S. Pat. No. 6,130,603. Other embodiments are possible. A power source 18 is connected to the integrated circuit 16 to supply power to the integrated circuit 16. In one embodiment, the power source 18 comprises a battery. The device 12 further includes at least one antenna 14 connected to the circuitry 16 for wireless or radio frequency tran...
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Abstract
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 establish 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 levels representing subgroups of the multiple wireless identification devices, the number of devices in a subgroup in one level being half of the number of devices in the next higher level, the tree search method employing level skipping wherein at least one level of the tree is skipped. A communications system comprising an interrogator, and a plurality of wireless identification devices configured to communicate with the interrogator in a wireless fashion, the respective wireless identification devices having a unique identification number, the interrogator being configured to employ a tree search technique to determine the unique identification numbers of the different wireless identification devices so as to be able to establish communications between the interrogator and individual ones of the multiple wireless identification devices without collision by multiple wireless identification devices attempting to respond to the interrogator at the same time, wherein levels of the tree are occasionally skipped.RFID tags are managed by an interrogator. In one embodiment, the interrogator sends a first command indicating a first value and a first memory range, and a second command indicating second value and a second memory range. The first memory range differs from the second memory range by at least two bits. RFID tags compare the first and second values to corresponding values stored in the tags to determine if the tags are selected. Selected tags may respond to the interrogator with independently generated random numbers.
Description
CROSS REFERENCE TO RELATED APPLICATION[0001]ThisMore than one reissue application has been filed for the reissue of U.S. Pat. No. 6,307,848, which reissue applications are the initial, present reissue application Ser. No. 10 / 693,697 filed Oct. 23, 2003, a continuation reissue applciation Ser. No. 11 / 865,580 filed Oct. 1, 2007, a continuation reissue application Ser. No. 11 / 865,584 filed Oct. 1, 2007, and a further continuation reissue application Ser. No. 12 / 604,329 filed Oct. 22, 2009, where the present application is a Continuationreissue application of U.S. Pat. No. 6,307,848, issued from U.S. patent application Ser. No. 09 / 773,461, filed Jan. 31, 2001, which is a continuation application of U.S. patent application Ser. No. 09 / 551,304, filed Apr. 18, 2000, <?delete-start id="DEL-S-00004" date="20110510" ?>and<?delete-end id="DEL-S-00004" ?> titled “Method of Addressing Messages, and Establishing Communications Using a Tree Search Technique That Skips Levels” <?in...
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