phd thesis



In this work, we study the relationship between topological metrics of Wireless
Ad Hoc Networks and the network performance. We are interested in applying
different concepts and metrics related to the network topology to three different
network models, namely (i) wireless sensor networks (WSNs), (ii) mobile ad
hoc networks (MANETs), and (iii) vehicular ad hoc networks (VANETs). These
three models cover a wide variety of network topologies, ranging from typically
static or nearly static topologies (WSNs) to highly dynamic topologies such as the
ones present in VANETs. The main contributions of this work are: firstly, we propose
an expressive topology model able to describe a wide variety of deployment
strategies for WSNs. We present a topology-related feature estimator derived
from the betweenness metric, suitable for representing the energy depletion related
to the sensor relay task in WSNs. We developed a distributed algorithm to
compute this metric, which was used to design a routing algorithm that aims to
make a fair balance of the relay task of nodes in a WSN. For MANETs, we developed
a new localization system for Internet capable devices, based on A-GPS
technology, which offloads the GPS raw signal data to the cloud. We show that
this technique is able to reduce the energy consumption up to 80% when compared
to traditional A-GPS. To tackle with the highly dynamic topologies present
in VANETs, we proposed the use of a cooperative target tracking solution to track
the quick changes of the topologies due to the high velocity of vehicles and used
this solution to improve the performance of a video distribution mechanism over

You can download the full document by using the link below.

Heitor Soares Ramos,
May 16, 2013, 3:48 PM