A novel time-efficient frame adjustment strategy for RFID anti-collision
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Recently, with the widespread popularization of radio frequency identification (RFID) technology in object identi- fication, multiple tags identification has attracted much attention. Identification time is a key performance metric to evaluate the RFID system. This paper analyzes the deficiencies of the state- of-the-arts algorithms and proposes a novel sub-frame-based algorithm with an adaptive frame size adjustment policy to reduce the identification time for EPCglobal C1 Gen2 UHF RFID standard. By observing the slot statistics in a sub-frame, the tag quantity is estimated by the reader, which afterwards efficiently calculates an optimal frame size to fit the unread tags. Only when the expected time efficiency in the calculated frame size is higher than that in the previous frame size, the reader starts the new frame. Moreover, the estimation of the proposed algorithm is implemented by the look-up tables, which allows dramatically reduction in the computational complexity. Simulation results show noticeable throughput, time efficiency, and identification speed improvements of the proposed solution over the existing approaches.
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