1. UNIVERSITY COLLEGE DUBLINDUBLIN CITY UNIVERSITY SMI || NCSR || CDVP http://www.cs.ucd.ie/csprism/ Ruzzelli, Cotan O’Hare, Tynan, Havinga Protocol assessment issues in low duty cycle sensor networks: The switching energy A.G. Ruzzelli, P. Cotan*, G.M.P. O’Hare, R. Tynan, and P.J.M Havinga** Adaptive Information Cluster (AIC) group @ PRISM Laboratory School of Computer Science and Informatics, University College Dublin (UCD), Ireland. *Department of Electronic Engineering, Technical University of Catalonia, Spain. **Department of Computer Science, University of Twente, The Netherlands.

2. UNIVERSITY COLLEGE DUBLINDUBLIN CITY UNIVERSITY SMI || NCSR || CDVP Summary Generality on protocol energy assessment The low duty Cycle Switching between transceiver states Measurements on board –The sensor node –The approach –The measured results The S-MAC protocol Performance evaluation Simulated results Conclusions

3. UNIVERSITY COLLEGE DUBLINDUBLIN CITY UNIVERSITY SMI || NCSR || CDVP Generality on protocol energy assessment Energy consumption is mainly due to the transceiver activity (~95%); Protocol energy assessment is based on transceiver time states: –Transmit time; –Receive time; –Idle time (Sleeping time in sensor networks); –Switching energy –NOT COMPUTED- Energy spent in state switching is negligible (true for ad-hoc network) Energy spent in state switching is also assumed negligible in wireless sensor networks.

4. UNIVERSITY COLLEGE DUBLINDUBLIN CITY UNIVERSITY SMI || NCSR || CDVP Sensor network generality Energy consumption as primary objective Introduction of the wake-up concept Very low duty cycle (less than 5%) Packets are much smaller than

5. UNIVERSITY COLLEGE DUBLINDUBLIN CITY UNIVERSITY SMI || NCSR || CDVP The switching energy Time elapse between the end of a transceiver state and the beginning of the following one: –Tx/Rx `and switching –Tx/sleep switching –Rx/sleep switching