The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 28, 2014
Filed:
Sep. 14, 2012
Eric Noel, Holmdel, NJ (US);
Kitming Wendy Tang, Stony Brook, NY (US);
Jaewook Yu, Port Jefferson Station, NY (US);
Eric Noel, Holmdel, NJ (US);
Kitming Wendy Tang, Stony Brook, NY (US);
Jaewook Yu, Port Jefferson Station, NY (US);
AT&T Intellectual Property I, L.P., Atlanta, GA (US);
The Research Foundation of State University of New York, Albany, NY (US);
Abstract
The performance of a radio frequency identification (RFID) system is improved by a protocol that eliminates collisions between signals generated by a) RFID tags that the RFID reader has already identified as being in its interrogation zone and b) RFID tags that are newly arrived and thus that the reader has not yet identified. This is illustratively accomplished by the use of separate identification and access frames. It is during the identification frame that newly arrived tags become identified by the reader. Although there may be collisions during the identification frame, those collisions are only among newly arrived tags. The already-identified tags communicate with the reader during respective time slots of the access frame, so that they neither collide with each other nor with the newly arrived tags.