An Efficient Collision Detection Scheme for Generation-2 RFID Systems
In radio-frequency identification (RFID) systems, tag collision resolution is a significant issue for fast tag identification. Dynamic framed slotted ALOHA (DFSA) is one of the most widely used algorithms to resolve tag collision. Collision detection (CD) plays an important role in determining the efficiency of DFSA-based algorithms because most DFSA-based algorithms determine the next frame size according to the number of collided slots in the current frame. Existing CD methods do not respond quickly enough to detect a collision and have difficulty in distinguishing a collision from noise, resulting in a degradation of system efficiency. This paper presents a CD scheme based on the EPCglobal Class-1 Generation-2 protocol to improve CD efficiency. This scheme enables fast and accurate CD by detecting the number of pulses transmitted by tags. The effectiveness and practical feasibility of the scheme is verified by simulation and implementation. Performance evaluation results show that the proposed scheme achieves faster identification speed than the conventional methods, especially under noise conditions.
Keywords: RFID, access protocols, tag collision, collision detection, ALOHA, Gen2
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ABOUT THE AUTHORS
Cheng Jin
Cheng Jin received the B.S. degree in automation engineering from Harbin Engineering University, China, in 2005, the M.S. degree in electronics and computer engineering from Hanyang University, Korea, in 2008. Currently, he is working toward the Ph.D. degree at the Department of Electronics and Computer Engineering, Hanyang University, Korea. His research interests include design and implementation of RFID reader systems, optimization of anti-collision protocols, and development of wireless communication systems.
Sung Ho Cho
Sung Ho Cho received the B.S. degree in electronics engineering from Hanyang University, Korea, in 1982, the M.S. degree in electrical and computer engineering from University of Iowa, Iowa, in 1984, and the Ph.D. degree in electrical and computer engineering from University of Utah, Utah, in 1989. From 1989 to 1992, he was with the Electronics and Telecommunications Research Institute (ETRI), Korea, as a senior researcher. He is currently with the Department of Electronics and Computer Engineering, Hanyang University, Korea, where he has been a professor since 1992. He has been the director of the Information Technology Research Center (ITRC) at Hanyang University, under the support of Ministry of Information and Communication, Korea, since 2002. Since 2008, he has been the director of the RFID Technologies Research Center at Hanyang University, under the support of Samsung Techwin Co., Ltd., Korea. His research interests include RFID, wireless sensor networks, embedded wireless and mobile communication systems design, networked robots, and DSP/FGPA applications.
Cheng Jin
Cheng Jin received the B.S. degree in automation engineering from Harbin Engineering University, China, in 2005, the M.S. degree in electronics and computer engineering from Hanyang University, Korea, in 2008. Currently, he is working toward the Ph.D. degree at the Department of Electronics and Computer Engineering, Hanyang University, Korea. His research interests include design and implementation of RFID reader systems, optimization of anti-collision protocols, and development of wireless communication systems.
Sung Ho Cho
Sung Ho Cho received the B.S. degree in electronics engineering from Hanyang University, Korea, in 1982, the M.S. degree in electrical and computer engineering from University of Iowa, Iowa, in 1984, and the Ph.D. degree in electrical and computer engineering from University of Utah, Utah, in 1989. From 1989 to 1992, he was with the Electronics and Telecommunications Research Institute (ETRI), Korea, as a senior researcher. He is currently with the Department of Electronics and Computer Engineering, Hanyang University, Korea, where he has been a professor since 1992. He has been the director of the Information Technology Research Center (ITRC) at Hanyang University, under the support of Ministry of Information and Communication, Korea, since 2002. Since 2008, he has been the director of the RFID Technologies Research Center at Hanyang University, under the support of Samsung Techwin Co., Ltd., Korea. His research interests include RFID, wireless sensor networks, embedded wireless and mobile communication systems design, networked robots, and DSP/FGPA applications.
