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Improving the Reliability of Energy Harvesting Wireless Sensor Networks

Jalali, Fatemeh | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: English
  3. Document No: 40235 (52)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Ejlali , Ali Reza
  7. Abstract:
  8. Energy harvesters are used in today’s Wireless Sensor Networks (WSNs) to harvest the energy from the environment. One of the important advantages of the energy harvesting sensor networks over battery-operated sensor networks is that the use of the energy harvester prolongs the life time of the nodes, while a battery-operated node becomes useless once its energy runs out. Although an energy harvester can provide a supply source with a lifetime much greater than a battery, the amount of available energy for an energy harvesting system is a random variable and is not as predictable as the energy of a battery. This unpredictability may cause reliability problems. In order to solve the existing problems, we aim to manage and balance the variable energy of nodes as well as overcoming reliability problems. Cooperative error control mechanisms such as cooperative ARQ (C-ARQ) and cooperative HARQ (C-HARQ) are acceptable solutions for improving energy management and reliability in energy harvesting WSNs. Recently some researchers have considered cooperative ARQ in GAP4S systems (energy harvesting systems with linear recharge rate and unbounded storage capacity). In this project we take advantage of cooperative HARQ and also cooperative ARQ in WSNs which are powered by solar energy with variable recharge rate and limited storage capacity. Furthermore, both classes of cooperative ARQ protocols are analyzed and compared via True-Time simulator.
  9. Keywords:
  10. Wireless Sensor Network ; Energy Harvesting ; Automatic Repeat Request (ARQ) ; Hybrid Automatic Repeat Request (HARQ) ; Error Control Mechanism

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