23-03-09 13:33
Age: 3 yrs

BY: LI, BO; YANG, YUQING; WANG, JUNYU

In this whitepaper, we focus on the anti-collision issues in EPC Gen2 Protocol, which is specified for passive UHF RFID system. In this case, we only take ‘Dynamic Framed Aloha’ schemes into consideration. When signals from more than two tags collide, from the traditional view, reader can not recognize any of them. However, this assumption turns out to be too pessimistic in RFID environment, where the so-called “capture effect” may take place. Capture effect happens when signals transmitted from multiple tags simultaneously arrive at the reader with different power levels, the strongest signal can be successfully received in the presence of collision. This effect will greatly influence the performance evaluation of anti-collision schemes, which is significantly different from the analysis before.\r\n

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