ASAP: A MAC protocol for dense and time-constrained RFID systems

Girish Khandelwal, Kyounghwan Lee, Aylin Yener, Semih Serbetli

    Research output: Contribution to journalArticlepeer-review

    44 Scopus citations


    We introduce a novel medium access control (MAC) protocol for radio frequency identification (RFID) systems which exploits the statistical information collected at the reader. The protocol, termed adaptive slotted ALOHA protocol (ASAP), is motivated by the need to significantly improve the total read time performance of the currently suggested MAC protocols for RFID systems.In order to accomplish this task, ASAP estimates the dynamic tag population and adapts the frame size in the subsequent round via a simple policy that maximizes an appropriately defined efficiency function.We demonstrate that ASAP provides significant improvement in total read time performance over the current RFID MAC protocols. We next extend the design to accomplish reliable performance of ASAP in realistic scenarios such as the existence of constraints on frame size, and mobile RFID systems where tags move at constant velocity in the reader's field. We also consider the case where tags may fail to respond because of a physical breakdown or a temporary malfunction, and show the robustness in those scenarios as well.

    Original languageEnglish (US)
    Article number18730
    JournalEurasip Journal on Wireless Communications and Networking
    StatePublished - 2007

    All Science Journal Classification (ASJC) codes

    • Signal Processing
    • Computer Science Applications
    • Computer Networks and Communications


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