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http://dx.doi.org/10.7840/kics.2012.37A.12.1013

Implementation of an Efficient Slotted CSMA/CA Anti-collision Protocol for Active RFID System  

Joo, Jin-Hoon (부산대학교 컴퓨터공학과 임베디드 네트워크 시스템 연구실)
Chung, Sang-Hwa (부산대학교 컴퓨터공학과 임베디드 네트워크 시스템 연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.37A, no.12, 2012 , pp. 1013-1022 More about this Journal
Abstract
Tag collection is one of the major concerns in radio frequency identification(RFID) system. All tags in RFID reader's transmission range send response message back to the reader in response to collection request message on the given rf channel. When multiple tags respond simultaneously, tag-collision may occur. Tag-collision problem is one of the most important issues in active RFID performance. To mitigate this problem, frame slotted ALOHA(FSA) anti-collision protocol is widely used in active RFID system. Several studies show that the maximum system efficiency of FSA anti-collision protocol is 36.8%. In this paper, we propose an efficient slotted CSMA/CA protocol to improve tag collection performance. We compare our protocol to the FSA anti-collision protocol. For the experiment, an 433MHz active RFID system is implemented, which is composed of an RFID reader and multiple tags. We evaluated the tag collection performance using one RFID reader and 40 tags in the real test bed. The experimental result shows that proposed protocol improves the tag collection time, round and collision probability by 18%, 37.4% and 77.8%, respectively.
Keywords
Active RFID; Slotted CSMA/CA; ISO/IEC 18000-7 Mode2; Tag collection;
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