Tag collision is one of the main issues impacting the performance of radio-frequency identification (RFID) systems. Several\nresearch efforts have been done in order to solve such problem. Current RFID standards, such as EPCGen2 and ISO-18000-7,\nadopt ALOHA-based protocols as the basis to solve collisions. In recent years, there has been a trend on designing schemes that\nsplit the interrogation zone into smaller regions with the aim of improving the system�s performance. In this paper, we evaluate\nand optimize the performance of ALOHA-based protocols for this new type of partitioning schemes. We establish the guidelines\nfor adapting ALOHA protocols to this new approach in order to exploit the advantages it offers.Thus, we propose a new version\nof the EPCGen2 standard adapted to the new partitioning schemes, which overcomes its counterpart for the traditional approach,\nsignificantly reducing the identification delay, which is the main parameter to optimize in RFID.
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