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Unformatted text preview: On the RFID wake-up impulse for multi-hop sensor networks Antonio G. Ruzzelli School of of Computer Science and Informatics University College Dublin email@example.com Raja Jurdak School of of Computer Science and Informatics University College Dublin firstname.lastname@example.org Gregory M.P. O’Hare School of of Computer Science and Informatics University College Dublin email@example.com Abstract Communication protocols for wireless sensor networks reduce the energy consumption by duty cycling the node activity and adopting a periodic sleeping scheduling. This approach often results in idle listening and therefore energy dissipated for listening to a channel free from packet transmitted. Duty cycling trades-off energy consumption due to idle listening and high end-to-end delay. Proposed solutions mitigate this issue for example through extra low-power radio components (wake-up radio) that listen to the radio and wake-up the node if some channel activity is sensed. These extra components also consume some energy to listen to the channel. In contrast, we propose an on-demand wake-up capability, namely RFIDimpulse, which is achieved through using an off-the-shelf battery- less RFID tag attached to each sensor node that is also provided with RFID reader capability. Because modern RFID techniques can trigger all the neighbouring tags at once or pinpoint a particular tag, RFIDimpluse provides both unicast and multicast capability. RFIDimpulse allows event- driven communication and eliminates node idle listening. 1 Introduction The advent of battery-operated wireless sensor networks technology is currently attracting great interests in a number of fields such as electronic payments, goods and material handling, security, structural monitoring and tracking. Wireless sensor technology consists of battery- operated autonomous wireless modules equipped with sensing capability. In wireless sensor networks, energy consumption is a primary issue as battery replacement is costly and sometime difficult according to application. In general, nodes wake-up periodically to listen for incoming packets from neighbours and re-synchronize their internal clock at regular intervals. In case no packets are destined to them, they switch-off the radio and set a counter for the next channel assessment. The energy dissipated in idle listening of the channel represents a great percentage with respect to the total energy consumption. As a result, idle listening is the main source of energy dissipation in sensor networks. Furthermore, energy saving mechanisms based on node duty cycling cannot turn-off completely the microprocessor that regulates the node’s internal clock, which also has a negative effect on the network operative lifetime....
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This note was uploaded on 01/27/2010 for the course EE 600 taught by Professor Aodafkdlja during the Spring '10 term at Aarhus Universitet.
- Spring '10