Fault-Tolerant Energy-Efficient Tree in Dynamic WSNs

Broadcasting has a main importance in Wireless Sensor Networks (WSNs). Effectively, the sink node hasto collect periodically, data from the environmentsupervised by sensors. To perform this operation, itsends requests to all nodes. Furthermore, WSNs havea dynamic behaviour due to their evolution. At anytime, a node can be retrieved from the network dueto an exhausting energy or a node problem. In fact,WSNs are prone to failure such as software or hardware malfunctioning, exhaustion of energy,wireless interference and environmental hazards.Thus, an appropriate broadcasting method shouldtake into consideration this aspect and uses the less possible amount of energy to accomplish the task. Inthis paper, a robust tree-based scheme is proposedwhich is called Robust Tree Broadcasting (RTB). Thenew scheme has a load-balanced behaviour which induces an efficient use of energy. In addition, RTBhas a high-quality fault tolerant performance.