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Improving Packet Scheduling in Multpath Video Delivery Over Wireless Multimedia Sensor Networks

Rastegar Lari, Amir | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: English
  3. Document No: 40426 (52)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Akbari, Behzad
  7. Abstract:
  8. Recent advances in WSN have led to next generation of it for multimedia transmission which is WMSN. WMSN has several applications like environmental monitoring, advance health care delivery and etc. However, providing QoS requirements of transmitting video data like delay, bandwidth and packet loss with minimum distortion at perceived video quality over WMSN with resource constraints is a challenging problem. Using multipath routing protocol for video communication can increase bandwidth and decrease delay over WMSN. Moreover, all video packets have not the same effect on video distortion. We propose a scheduling mechanism which classifies packets according to their types and contents and sends more important packets through paths with better conditions. Path conditions are evaluated by a score mechanism with the following parameters: minimum free buffer size, minimum residual energy, and hop count and packet loss based on delay. Paths are classified according to their scores and those that have higher reliability, transmit more important packets to decrease video distortion due to congestion over network or node’s energy failure. Furthermore, path conditions are not constant and they are changed over the time. Consequently, control packets are used for collecting path conditions and adapting packet scheduling to network conditions. Finally, simulation results show that packet and path scheduling mechanism with help of control packets can increase video quality at receiver while satisfying delay constraint, bandwidth and energy consumption by distributing packets among all available paths dynamically
  9. Keywords:
  10. Sensor Network ; Packet Scheduling ; Video Content ; Multimedia Networks

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