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:
Nov. 03, 2009
Filed:
Dec. 20, 2006
Ji Hwan Choi, Seoul, KR;
Hyuckjae Lee, Daejeon, KR;
Dongwook Lee, Gyeongsangbuk-do, KR;
Hyunseok Lee, Daegu, KR;
Youngwoo Youn, Jeollanam-do, KR;
Jungeun Kim, Seoul, KR;
Ji Hwan Choi, Seoul, KR;
Hyuckjae Lee, Daejeon, KR;
Dongwook Lee, Gyeongsangbuk-do, KR;
Hyunseok Lee, Daegu, KR;
Youngwoo Youn, Jeollanam-do, KR;
Jungeun Kim, Seoul, KR;
Research and Industrial Cooperation Group, Daejeon, KR;
Abstract
A query tree based tag identification method in RFID systems includes: (a) forming a temporary ID for each of the tags; (b) comparing an inquiry of the reader with a portion of the temporary ID in each tag when receiving the inquiry from the reader; (c) if the inquiry and the portion of the temporary ID are identical to each other, transmitting a remainder of the temporary ID in each tag to the reader; (d) if a collision occurs in the step (c), generating new inquiries for storing them in the reader; (e) if there is no collision in the step (c), transmitting an ACK signal to each tag whose temporary ID is identified to receive its real tag ID therefrom; and (f) repeating the steps (b) to (e) until there is no inquiry in the reader.