A study on enhanced anti-collision protocol for low-cost RFID systems = 저가 RFID 태그 시스템에서의 향상된 태그 충돌 방지 프로토콜 연구

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Passive RFID tags, which have no self-battery and just backscatter the energy from a reader, share a common channel. It causes a tag-to-tag collision problem when at least two or more tags communicate to the reader simultaneously. The dynamic frame slotted Aloha (DFS-Aloha) protocol is one of the well-known anti-collision algorithms to solve this problem. To maximize the system performance and enhance the reading speed of Aloha protocols, we propose a frame grouping algorithm, called grouped frame Aloha (GF-Aloha), which splits a large-frame of Aloha into several groups. The tags are allocated to each group according to their collision information at the previous frame. To implement the idea, tag structure and GF-Aloha protocol are designed based on the EPC Class 1 Generation 2. In addition, we also suggest a frame size estimator that enhances the Q-Algorithm and find the best parameters of the proposed estimation algorithm. Finally, combining the GF-Aloha and the proposed estimation algorithm, we suggest high speed anti-collision protocol for low-cost RFID tags. Simulation results show that the GF-Aloha algorithm outperforms the conventional non-grouped Aloha protocol and the proposed estimation algorithm also enhances the system performance. Moreover, the combination of GF-Aloha and the proposed estimation algorithm takes less identification time than DFS-Aloha with Q-Algorithm based on EPC Class 1 Generation 2 protocol. In conclusion, the proposed schemes enhances the identification time of DFS-Aloha for low-cost RFID systems. Moreover, the proposed anti-collision protocol can be adopted to not only supply chain management using low-cost RFID but also Aloha-based sensor network as an fast multiple access protocol.
Lee, Hyuck-Jaeresearcher이혁재researcher
한국정보통신대학교 : 공학부,
Issue Date
392933/225023 / 020064585

학위논문(석사) - 한국정보통신대학교 : 공학부, 2008.2, [ vi, 54 p. ]


Passive tag; RFID; Dynamic Frame Slotted-Aloha; 프레임 슬랏 알로하; 수동태그; 알에프아이디; Q-Algorithm

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School of Engineering-Theses_Master(공학부 석사논문)
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