dc.description.abstract | Nowadays the widespread use of variety of smart phones and tablets
with wide range of multimedia application support is driving more data
service users towards full mobility causing a rapid increase in demand
for mobile data rates. These new devices and multimedia applications
require high data rates and reduced latency to provide better Quality
of Service (QoS). To address these requirements the 3rd Generation
Partnership Project (3GPP) introduces Long-Term Evolution (LTE) with
a capability to move towards Fourth Generation (4G) wireless systems. It
is designed to be a high data rate and low latency system that aiming to
support different types of services. As the demand for massive multimedia
delivery over LTE network increases, a novel transmission techniques
such as Network Coding (NC) are needed.
In this thesis work we present the QoS performance analysis of downlink
LTE using an open source simulation libraries, Network Simulator-3
(ns-3) and Kodo. The main performance parameters considered are the
throughput, packet delay, spectral efficiency, capacity and coverage. Factors
affecting the overall performance such as the fading, shadowing,
buildings, User Equipment (UE) speed, UE-Evolved Node B (eNB) distance
and traffic load are considered. The scenario used for the analysis
includes multiple UEs and eNBs for different system antennas and system
bandwidths. Moreover, Random Linear Network Coding (RLNC) coding
scheme is implemented in LTE networks for a simple scenario composed
of a single UE, eNB and remote host to assess the usefulness of NC.
The results obtained shows the impact of different factors on the system
QoS performance. The throughput, delay, spectral efficiency, capacity and
coverage performances are evaluated and discussed for different system
bandwidth and different system antennas with varying transmission power.
In addition, network coding has been shown to improve the throughput
at a cost of higher packet delay. Moreover, alternatives ways of improving
the throughput and different variants of NC are discussed. Since the
results are based on both theory and experiments, the analysis and
discussions made could be considered as a start point in dimensioning an
LTE commercial networks. Suggestions for future work and a draft of a
conference paper are also given. | |