| Abstract: |
In last years, the wireless sensor networks (WSNs) have take the interest of researchers since they have a number of potential applications in many domains of daily-life such as environment monitoring, healthy monitoring, medicine, surveillance, military, etc. The innovation of digital electronics, micro controller, wireless communications have facilitated the development of small tiny devices with these characteristics: low-cost, low-power and multi-functional. Due to the small size and the difficult access of a sensor node, the power source has limited capacity and can- not be replaced (non-replaceable). Therefore, energy consumption is an important constraint in WSNs. Energy harvesting (from many natural environment re- sources such as the heating, the sun light, the wind etc.) provides an effective option to increase the life- time of the sensor network but it is not a complete solution. In some cases, these resources are not enough to be ensure a sufficient reliability. Thus the reduction of energy consumption is still one important focus of research in WSNs domain. |