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ECE Oral Comprehensive Exam for Doctoral Candidacy by Amir Ehsani Zonouz
|Category:||College Of Engineering - Ece|
|Date & Time:||
Friday , 02/22/2013
from 09:00 AM to 11:00 AM
|Location:||Lester W. Cory Conference Room, SENG - Room 213A|
|Sponsored by:||ECE Department|
TOPIC: “APPLICATION COMMUNICATION RELIABILITY AND SMALL-WORLD IN WIRELESS SENSOR NETWORKS”
This dissertation will focus on the application communication of wireless sensor networks (WSN), which relates to the transfer of sensor data collected from the physical environment to the sink node. More specifically, application communication of WSN depends on two important factors: acquisition of sensed data from a specific area, and network connectivity that concerns the reliable delivery of the observed data from sensor nodes to the sink node. We model and analyze the application communication reliability (ACR) of WSN supporting K-coverage in the presence of shadowing for a specific monitored area. The impact of different K-coverage requirements, routing protocols (single-path and multi-path), network density, and channel conditions on ACR will be studied. A prototype software tool will be developed to implement the proposed reliability models and methods for WSN under the application communication paradigm. Additionally, a test bed will be built to validate the proposed research on ACR.
Wireless links are one of the primary performance-limiting factors in WSN. In particular, link failures negatively influence the network performance, reliability, and availability in most cases. In WSN, a link failure might result in the loss of the shortest path between a sensor node and the sink node; thus the data will have to be transmitted via a longer path, leading to longer transmission delay and increased energy consumption. Therefore, it is crucial to characterize the impact of different parameters, such as battery life-time, power consumption of sensor nodes, fading, and interference, on wireless links. Another contribution of this dissertation work is the introduction of a time-dependent link failure model that incorporates the consideration of battery discharge for different type of batteries, sensor node power consumption, and wireless channel conditions. Furthermore, effects of the proposed link failure model on ACR and energy consumption of transmitting sensed data using different routing protocols will be studied.
In this dissertation research, we will also investigate the concept of small-world for improving the communication reliability and energy consumption of wireless networks. Small-world phenomenon is an important property of many complex networks possessing small average shortest path lengths and high clustering coefficients. We investigate solutions based on extension of wireless links...