[Colloq] Reminder: PhD Thesis Proposal by Xin Liu, Today, Wed. March 14

[Rachel Kalweit]

College of Computer and Information Science
presents
PhD Thesis Proposal by:
Xin Liu
Proposal Title:
Cross Layer Design for Cooperative and Adversarial Wireless Networks

Wednesday, March 14, 2007
3:40pm
366 West Village H

Abstract
This thesis work focuses on developing novel techniques to improve the
performance of wireless networks under two communication models: (1)
cooperative communication, and (2) adversarial environment. The proposed
research relies on a cross-layer communication paradigm where multiple
layers of protocols coordinate to achieve a common goal to increase
throughput or robustness to jamming, or to reduce energy consumption.

The nature of wireless communication is broadcast. The positive aspect
of this broadcasting property is that it naturally enables wireless
nodes to cooperate so that the global performance can be increased
efficiently. The first part of our work is in such a cooperative
setting. The objective is to minimize the energy consumption of
delivering information over the network, since energy efficiency is
crucial to extend wireless networks' lifetime. We propose a solution
based on a novel communication model which allows wireless nodes to
accumulate energy from partially overheard packets. Multiple layers,
from the physical layer to the routing layer, are involved in searching
the optimum transmission strategy.

The negative aspect of this sharing medium property of wireless networks
is that it is very easy for adversaries to attack the communication by
way of monopolizing the medium, eavesdropping, or interfering the
communication. Therefore, the second part of our research aims at
increasing wireless networks' resiliency to cross-layer jamming attacks.
We propose a novel cross-layer communication architecture in conjunction
with fine-designed mechanism-hopping techniques to improve the network
robustness against adversaries. Just as the spread spectrum technique
thwarts malicious attackers by hopping frequencies in a pseudo-random
fashion, our approach foils jamming attacks by adaptively and
dynamically switching between different mechanisms at different layers
of the stack.

In this proposal, we define the paradigms, present preliminary results
obtained so far and discuss research in the next step.


Committee:
Prof. Guevara Noubir
Prof. Ravi Sundaram
Prof. Rajmohan Rajaraman
Prof. Agnes Chan
Dr. Tushar Saxena


-- 
Rachel Kalweit
College of Computer and Information Science
202 West Village H
Northeastern University
phone: 617-373-2462
fax: 617-373-5121
rachelb at ccs.neu.edu

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