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A Cross Layer Approach for Real-Time Communication in Wireless Sensor Networks

Eskandari, Leila | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: English
  3. Document No: 41968 (52)
  4. University: Sharif University of Technology
  5. Department: Science and Engineering
  6. Advisor(s): Movaghar, Ali; Khansari, Mohammad
  7. Abstract:
  8. Most of current the MAC protocols for Wireless Sensor Networks (WSNs) concern about energy efficiency rather than low latency. The main source of energy consumption in the MAC layer is idle listening, and most of these protocols use duty cycling for reducing energy consumption. But duty cycling method increases packet delivery latency. This problem is very critical in real time applications where packets should meet their deadline. There are some solutions for this problem. For example a node forwards data packets multi hop away instead of one hop in a single cycle. In this research, an efficient cross layer MAC protocol for real time applications is proposed. In this protocol multi hop forwarding is used to improve data latency. By exploiting some cross layer information and sending a setup control frame called PION each data path is reserved to deliver data packets. To handle interference between paths each node uses its overhearing to reserve the path at the right time. Also in the proposed protocol each node along the path first delivers the packets which have higher priority and may miss their deadline. The simulation results show that MPIA-RMAC outperforms a similar approach called RMAC and improves delay and energy consumption
  9. Keywords:
  10. Wireless Sensor Network ; Cross Layer Design ; Duty Cycle ; Medium Access Control Sublayer ; Real Time Communication

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