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Passive RFID systems typically utilize contention-based MAC protocols, such as the standard C1G2 protocol. While these protocols are easy to implement, they suffer from unfairness and low throughput. This paper proposes a token-based MAC protocol called Token-MAC for passive RFID systems. Token-MAC is designed to enable fair access to the medium for all tags without requiring a-priori knowledge of the tags or synchronization of the tags. We implement Token-MAC as well as a TDMA-based protocol and compare these approaches with the standard C1G2 protocol. Our experiments show that Token-MAC has a higher tag rate and better fairness than C1G2, and can achieve good performance over a longer range than the TDMA-based protocol. Token-MAC is therefore a viable solution for many passive RFID systems.
CitationChen, L.; Seyfettin, I.; Heinzelman, W. Token-MAC : a fair MAC protocol for passive RFID systems. A: IEEE Global Communications Conference. "IEEE Global Telecommunications Conference, GLOBECOM 2011, 5-9 Dec 2011, Houston, Texas, USA". Houston, Texas: IEEE, 2011, p. 1-5.
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