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Erschienen in:
2013 | OriginalPaper | Buchkapitel
4. Tag-ordering Polling Protocols in RFID Systems
verfasst von : Yan Qiao, Shigang Chen, Tao Li
Erschienen in: RFID as an Infrastructure
Verlag: Springer New York
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Abstract
This chapter studies the problem of how to collect real-time information from a subset M of tags in a large RFID system. We show that the standard, straightforward polling design is not energy-efficient because each tag has to continuously monitor the wireless channel and receive O(|M|) tag IDs, which is energy-consuming. It is possible to cut the amount of data each tag has to receive by half through a coding design. But we present a tag-ordering polling protocol (TOP) that can reduce per-tag energy consumption by more than an order of magnitude. We also reveal an energy-time tradeoff in the protocol design: per-tag energy consumption can be reduced to O(1) at the expense of longer execution time of the protocol. We then apply partitioned Bloom filters to enhance the performance of TOP, such that it can achieve much better energy efficiency without degradation in protocol execution time. Finally, we show how to configure the new protocols for time-constrained energy minimization.