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By Cigdem Sengul


Energy conservation is one of the greatest challenges in multi-hop wireless networks due to the everincreasing energy requirements of wireless devices and the slow advancement of battery technology. While significant energy savings can be obtained by incorporating energy efficiency into the design of network protocols, the approaches taken so far have been very diverse. Current research has focused on either optimizing the energy use for a given communication task, or optimizing the energy consumption when the network is idle. However, an integrated approach is lacking. To this end, we explore the limits of traditional stand-alone techniques and expose some commonly held myths about energy conservation in wireless multi-hop networks. The main goal of our research is to develop a unified design that enables energy-efficient network operation. In the first part of the thesis, we explore the existence of an optimal operating point that minimizes energy while satisfying the communication requirements on the network. Our goal is to conserve energy by accounting for all sources of energy consumption: (1) energy consumed for communication including energy spent for data and control overhead and (2) energy consumed during idling. Essentially, this is an energy-efficient network design problem. Since this problem is a node-weighted buy-at-bulk problem, which is NP-hard, we follow a divide-and-conquer approach

Year: 2007
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