In order to reduce energy consumption in wireless ad hoc and sensor networks, the Topology Control (TC) remains one of the most important technique used. TC is able to construct network topologies, which have desired characteristics. It has also a dynamic ability to change the node transmitting range in a way to meet graph global property such as connectivity, while reducing energy consumption and radio interference. In this paper, we explore the energy-aware Topology Control in wireless ad hoc networks by formulating and solving the corresponding optimization problem. We propose an ILP formulation that minimizes the total transmission power needed by nodes to construct a topology that can meet Quality of Service (QoS) requirements between source and destination node pairs with less computational effort. The simulation results show that our algorithm has a better performance for data traffic in ad hoc networks. To evaluate the efficiency of our proposed algorithm, we compare its performance by simulation with another QoS model, using power efficiency measures.

The recent multimedia applications and services are very demanding in terms of Quality of Service (QoS). This creates new challenges in ensuring QoS when delivering those services over wireless networks. Motivated by the need of supporting high quality multicast applications in wireless ad hoc networks, we propose a network topology that can minimize the power when connecting the source node to the destination nodes in multicast sessions with the respect of the QoS provisions. We formulated the problem as integer linear programming problem with a set of energy and QoS constraints. We minimize the total power of energy used by nodes while satisfying QoS constraints (Bandwidth and maximum delay) that are crucial to wireless ad hoc network performance.

Nodes in ad hoc networks rely on batteries with limited capacity. As result, this imposes constraints on the network lifetime. In order to maximize the network lifetime, routing protocols should deliver traffic in a way that the energy consumption is minimized. This paper discusses the problem of energy saving in QoS multicast routing of ad hoc wireless networks. Our goal is to find a network topology that has the minimum energy consumption and satisfies the QoS requirements with the maximization of the network lifetime. The problem is formulated as an integer linear programming problem along with a set of power and QoS constraints.

Wireless Sensor Network is an emerging technology that has the potential to be used in futuristic applications. Sensor nodes are energy-constrained. They rely on batteries with limited capacity which impact their lifetime or mobility. To address this problem, energy harvesting technology is a solution that aims to avoid the premature energy depletion of nodes. It recharges their batteries using an energy harvesting system from the environment. In this review work, we present the concept of energy harvesting technology (EH) and Energy-Harvesting for Wireless Sensor Network (EH-WSN). We then discuss many schemes in the literature to save energy consumption of the energy harvesting sensor networks. We study their protocol design strategies and working principals. We also summarize their merits, demerits along with some future research directions.

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