IMPROVING DATA DELIVERY PERFORMANCE IN WIRELESS SENSOR NETWORKS

The Hong Kong University of Science and Technology
Department of Computer Science and Engineering


PhD Thesis Defence


Title: "IMPROVING DATA DELIVERY PERFORMANCE IN WIRELESS SENSOR NETWORKS"

By

Mr. Jiliang Wang


Abstract

A wireless sensor network (WSN) typically consists of a large number of 
resource constrained sensor motes spanning in a large field for data 
collection. Data delivery is usually achieved with multi-hop transmission 
along a sequence of nodes. Thus multi-hop data delivery is a fundamental 
issue in WSNs. Based on a real world environment monitoring sensor network 
project GreenOrbs, this thesis addresses four key aspects for improving 
data delivery performance from different layers in wireless sensor 
networks. At network layer, this thesis presents a comprehensive path 
quality estimation metric and introduces an optimal packet scheduling 
algorithm to balance workloads among sensor motes for a low-duty-cycled 
network in which motes periodically wake up to save energy. At MAC layer, 
this thesis introduces an approach to improve channel efficiency by 
combining multiple packets and determining an appropriate sending time and 
presents a method to alleviate packet losses by considering receiver-side 
collisions. Through intensive simulations and real world implementations, 
I evaluate the performance of the proposed methods in a real system and 
verify the applicability. The results show that the proposed methods are 
effective and efficient.


Date:			Tuesday, 5 July 2011

Time:			2:00pm – 4:00pm

Venue:			Room 3584
 			Lifts 27/28

Chairman:		Prof. Wing Hung Ki (ECE)

Committee Members:	Prof. Yunhao Liu (Supervisor)
 			Prof. Lei Chen
 			Prof. Lionel Ni
                      	Prof. Ling Shi (ECE)
                         Prof. Weijia Jia (Comp. Sci., CityU.)


**** ALL are Welcome ****