SATS: An Ultra-Low Power Time Synchronization for Solar Energy Harvesting WSNs

Abstract

Reliable and ultra-low power time synchronization becomes more and more important with the popularity of energy harvesting sensor nodes. This paper proposes an untethered and probabilistic ultra-lower power time synchronization method for energy intermittent sensor network. It avoids the frequent RF communications with the assistance of a solar clock. The SATS system consists of two main parts: the synchronizer, a low power solar clock module for time synchronization, and the S3-Mapping, an offline sequence matching algorithm. Furthermore, we develop an improved version of S3-Mapping, which reduces the computation complexity from exponential to linear using the redundancy models and the onion peeling method. The SATS system is validated by both simulations and a prototype, which shows that the second level synchronization precision can be achieved under reasonable probability. What's more, the energy consumption of time synchronization is reduced by over 1 ~ 2 magnitudes compared with the up-to-date low power time synchronization protocol.

DOI: 10.1145/2934583.2934601

Cite this paper

@inproceedings{Wu2016SATSAU, title={SATS: An Ultra-Low Power Time Synchronization for Solar Energy Harvesting WSNs}, author={Tongda Wu and Yongpan Liu and Hehe Li and Chun Jason Xue and Hyung Gyu Lee and Huazhong Yang}, booktitle={ISLPED}, year={2016} }