Radio frequency identification (RFID) systems are increasingly used for a wide range of applications from supply chain management to healthcare. In a typical RFID system, a reader (interrogator) communicates with mult...
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ISBN:
(纸本)9781479979905
Radio frequency identification (RFID) systems are increasingly used for a wide range of applications from supply chain management to healthcare. In a typical RFID system, a reader (interrogator) communicates with multiple tags (transponders) for information exchange. If multiple tags try to communicate with the reader at the same time, a collision occurs leading to failed communications. As RFID usage in high tag density environments, such as in apparel industry, becomes more prevalent, addressing the collision problem takes priority. In this paper, we propose a dynamic modification to the existing Q-algorithm used as part of the industry standard EPC Class 1 Generation 2 (Gen 2) protocol for passive RFID systems to improve system efficiency and reduce the number of collisions. Using radar cross section scatter plots, the number of tags in a given time slot is estimated and a Q-Frame-Collision-Counter (qfcc) is used to make an informed adjustment to the next frame size instead of simply adding a parametric constant to the Q parameter. Contrary to most of the existing proposals in the literature for improved collision algorithms, this approach does not require any change in the existing standard Gen 2 protocol timings and/or command structure. In fact, all Gen 2 compliant commercial tags can be directly used with the proposed modification which still provides an efficiency gain of up to 7.5% compared to the existing standard and a more robust performance throughout the Gen 2 parameter spectrum such as Q and C.
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