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The diversity of the applications supported by wireless ad hoc and sensor networks explain the success of these networks. However, their energy constrained nature requires the use of energy efficient strategies to maximize network lifetime. We can classify these strategies in four categories: 1. energy efficient routing, 2. scheduling the nodes sleeping(More)
Energy efficiency is a key issue in wireless ad hoc and sensor networks. Several directions have been explored to maximize network lifetime, among them energy efficient routing. In this paper, we show how to extend the standardized OLSR routing protocol, in order to make it energy efficient. To take into account residual node energy, three new selection(More)
— Wireless sensor networks are adapted to monitoring applications. Specific solutions have to be developed for industrial environments in order to deal with the harsh radio conditions and the QoS (quality of service) requirements of industrial applications. In this paper, we present the main protocols used in the OCARI project, and we describe their use of(More)
In wireless sensor networks, energy efficiency is achieved by making nodes sleep. In this paper, we propose SERENA, a node activity scheduling algorithm based on three-hop coloring. We study the performance of SERENA by simulating the conditions of a realistic environment including unidirectional links. The existence of unidirectional links causes color(More)
In wireless ad hoc and sensor networks, the best way for a node to spare energy is to sleep. In this paper, we propose SERENA, a solution to allow router nodes to sleep in such a way that the basic network functionality, i.e. end-to-end communication, is always ensured. SERENA is based on distributed and localized two-hop coloring. The node's color is then(More)
In wireless ad hoc and sensor networks, an analysis of the node energy consumption distribution shows that the largest part is due to the time spent in the idle state. This result is at the origin of SERENA, an algorithm to SchEdule RoutEr Nodes Activity. SERENA allows router nodes to sleep, while ensuring end-to-end communication in the wireless network.(More)
In this paper, we consider wireless ad hoc and sensor networks where energy matters. Our contribution deals with energy efficient routing. The idea consists in reducing the energy spent in the transmission of a packet from its source to its destination, while avoiding nodes with low residual energy. The solution we propose, called EOLSR, is based on the(More)