Publication Details

This conference paper was originally published as Klair, DK, Chin, KW, Raad, R, An Investigation into the Energy Efficiency of Pure and Slotted Aloha Based REID Anti-Collision Protocols, IEEE International Symposium on a World of Wireless, Mobile and Multimedia Networks WoWMoM 2007, 18-21 June, 1-4.


This paper investigates the energy efficiency of RFID anti-collision protocols and their suitability for use in RFID-enhanced wireless sensor networks (WSNs). We present a detailed analytical methodology and an in-depth qualitative and Aloha anti-collision protocols and their variants. We find that Slotted Aloha variants that employ muting with early-end are the most energy efficient, but are computationally expensive. Overall, for all Aloha variants we investigated, if the offered load is very high, tag responses cause a bottleneck at the reader. Thereby, resulting in no tags being identified and incur significant identification delays - thus severely impacting a sensor node's battery life.



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