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Reliability Analysis of Energy Harvesting Wireless Sensor Networks

Mirbaha, Elaheh | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46618 (19)
  4. University: Sharif University of Technology
  5. Department: Computer Engineering
  6. Advisor(s): Miremadi, Ghassem
  7. Abstract:
  8. Wireless Sensor Networks (WSN) are wildly utilized in surveillance and controling applications, and because of their remote and standalone operation, lifetime and reliability of a typical WSN are two main concerns in these networks. One of the reliability threatening issues in a WSN is residual accessible energy for each node. Nowadays, energy harvesting systems are used in WSN nodes to catch environmental energy, and reduce the energy limitation. However, because of inherent uncertainty of energy harvesting systems, the networks that operate using environmental energy have new reliability issues. Different rate of energy harvesting, according to environmental conditions, is one of the most important challenges in these networks. Therefore, accessible energy distributes asymmetrically among nodes. The main contribution of this thesis is to propose an approach to transfer packets reliably across the network regarding to amount of accessible energy for each node. The proposed approach is based on increasing transmission power of those nodes whichgain more energy from the environment. Due to the various rates of energy harvesting in different nodes, we detect the node with higher harvesting rate and increase its transmission power. In this work, nodes with higher level of residual energy increase their transmission power to send packet more reliably and decrease the number of relay nodes in the path to sink. The main motivation of this work is that power amplifier in a node, is not the dominant energy consumer in transmitter unit. Therefore, increasing the power of transmitter, leads to negligible increase in energy consumption of WSN node. If a node that cannot harvest energy from environment fails, it affects the total network performance and reliability. In our work , by decreasing the number of hops in the path, residual energy of low energy nodes is preserved. For this aim, every node informs its neighbors from its residual energy and its transmission power. Each node's neighbors will decide if they should transmit their own packet with high energy or not. Another mechanism is adopted to reduce the traffic by detecting and removing additional packets. By applying this method, the packet delivery ratio in network with different densities is increased by 27% in average
  9. Keywords:
  10. Reliability ; Wireless Sensor Network ; Energy Harvesting

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