Unit:
Κατεύθυνση Οικονομική και Διοίκηση των Τηλεπικοινωνιακών ΔικτύωνLibrary of the School of Science
Author:
Χουρδάκη Κωνσταντίνα
Supervisors info:
Λάζαρος Μεράκος, Καθηγητής Ε.Κ.Π.Α.
Original Title:
Αξιολόγηση ποιότητας εμπειρίας VoIP κλήσεων σε LTE δίκτυα δύο επιπέδων
Summary:
The continuous development of 2nd and 3rd Generation cellular networks implies
an increasing need for higher data rates and improved service quality. The
LTE-Advanced is expected to effectively address these needs by supporting
Heterogeneous Networks, i.e. networks which include low power nodes such as
femtocells. Femtocells are a promising solution which will improve the network
coverage and will provide high-speed data rates. However, there will be major
challenges such as interference management between neighboring femtocells or
between femtocell and macrocell. Voice quality can be severely degraded due to
interference and therefore operators focus on continuous quality improvement.
Consequently it is crucial to evaluate speech quality in terms of mean opinion
score. The purpose of this Master thesis is to study the impact of femtocells
deployment on quality of experience of a VoIP user. We conduct an LTE network
simulation and study the relationship between the estimated VoIP quality and
the number of users, the speed and the traffic load. Furthermore, we develop a
comparative analysis in VoIP speech quality between scenarios which do or do
not include femtocells. Finally, we draw general conclusions regarding the
impact of introducing femtocells on the estimated quality of experience.
Keywords:
Quality of service, Quality of experience, Femtocells, Voice over IP, Mean opinion score
Number of index pages:
13-17
