
Vasileios Kokkinos
Short CV: Dr. Vasileios Kokkinos was born in Ioannina, Greece in 1981. He obtained his diploma from the Physics Department of the University of Patras in October 2003. Next, he was accepted in the postgraduate program “Electronics and Information Processing” in the same department and in March 2006 he obtained his Master Degree. In 2010 he received his PhD on Power Control in Mobile Telecommunication Networks from the Computer Engineering and Informatics Department. Dr. Kokkinos has worked as a member of Collaborating Teaching Staff in the context of the Open and Distance Teaching provided by the Hellenic Open University, in the framework of the Thematic Unit “PLI23 – Telematics, Internet and Society”, of the Under/Postgraduate Program “PLI – Informatics”, of the School of Sciences and Technology (academic years 2020-21 and 2021-22). He was also an appointed teaching staff of the courses “Broadband Technologies” and “Public Use Networks and Network Interconnection” of the study program of Computer Engineering & Informatics Department of the University of Patras during academic years 2020-21, 2021-22, 2022-23 and 2023-24. He currently works as Computer and Informatics Engineer and Manager at the Distributed Systems and Telematics Lab of the Computer Engineering and Informatics Department. His research interests include data networks, 3rd/4th/5th generation mobile telecommunications networks, multicast routing and group management, radio resource management, internet of things and machine learning. He has participated in several R&D projects, and he has published several research papers in various well-known refereed conferences and articles in scientific journals.
Journal Articles
Bouras, Christos; Papazois, Andreas; Kokkinos, Vasileios; Kanakis, Nikos
Embracing RaptorQ FEC in 3GPP multicast services Journal Article
In: Wireless Networks, Springer Verlang, pp. 1023-1035, vol. 19, pp. 1023-1035, 2013.
Abstract | Links | BibTeX | Tags: FEC, MBMS
@article{3119,
title = {Embracing RaptorQ FEC in 3GPP multicast services},
author = {Christos Bouras and Andreas Papazois and Vasileios Kokkinos and Nikos Kanakis},
url = {https://telematics.upatras.gr/331510-1007_s11276-012-0515-3/},
year = {2013},
date = {2013-01-01},
urldate = {2013-01-01},
journal = {Wireless Networks, Springer Verlang, pp. 1023-1035},
volume = {19},
pages = {1023-1035},
abstract = {Multimedia Broadcast/Multicast Services (MBMS) have been introduced by Third Generation Partnership Project (3GPP) aiming to efficiently deliver data to mobile users in a one-to-many way. In order to provide reliable multicast transmission, 3GPP recommends exclusively for MBMS the use of a Forward Error Correction (FEC) mechanism on the application layer. Raptor codes are standardized as the Application Layer FEC (AL-FEC) scheme over 3GPP MBMS. However, the 3GPP standardized systematic fountain Raptor code is nowadays considered obsolete, since a new variation of the Raptor codes has emerged. This enhanced AL-FEC scheme, named RaptorQ, promises higher protection efficiency and superior flexibility on the provision of demanding mobile multicast services. In this work, we provide an extensive performance evaluation presenting at first a theoretical performance comparison of the newly introduced RaptorQ FEC scheme with its predecessor Raptor code, examining the enhancements that RaptorQ introduces on the AL-FEC protection robustness. Thereafter, to verify the enhanced performance of RaptorQ, we present several simulation results considering the modeling of the AL-FEC protection over multicast services for next generation mobile networks, utilizing the ns-3 simulation environment. Investigating several mobile system parameters in conjunction with FEC encoding parameters, we provide valuable results regarding the impacts of the examined AL-FEC schemes application on the multicast services performance.},
keywords = {FEC, MBMS},
pubstate = {published},
tppubtype = {article}
}
Bouras, Christos; Papazois, Andreas; Kokkinos, Vasileios; Kanakis, Nikos
Application Layer Forward Error Correction for Multicast Streaming over LTE Networks Journal Article
In: International Journal of Communication Systems, Wiley InterScience, pp. 1459-1574, vol. 26, pp. 1459-1574, 2013.
Abstract | Links | BibTeX | Tags: FEC, LTE, MBMS
@article{3113,
title = {Application Layer Forward Error Correction for Multicast Streaming over LTE Networks},
author = {Christos Bouras and Andreas Papazois and Vasileios Kokkinos and Nikos Kanakis},
url = {https://telematics.upatras.gr/3846dac2321/},
year = {2013},
date = {2013-01-01},
urldate = {2013-01-01},
journal = {International Journal of Communication Systems, Wiley InterScience, pp. 1459-1574},
volume = {26},
pages = {1459-1574},
abstract = {The next step beyond third generation (3G) mobile networks is the Third Generation Partnership Project (3GPP) standard, named Long Term Evolution (LTE). A key feature of LTE is the enhancement of Multimedia Broadcast/Multicast Services (MBMS), where the same content is transmitted to multiple users located in a specific service area. To support efficient download and streaming delivery, 3GPP included an application layer Forward Error Correction (AL-FEC) technique based on the systematic fountain Raptor code, in the MBMS standard. In order to achieve protection against packet losses, Raptor codes introduce redundant packets to the transmission, i.e., the FEC overhead. In this work, we investigate the application of AL-FEC over MBMS streaming services. We consider the benefits of AL-FEC for a continuous multimedia stream transmission to multiple users and we examine how the amount of FEC redundancy can be adjusted under different packet loss conditions. For this purpose, we present a variety of realistic simulation scenarios for the application of AL-FEC and furthermore we provide an in-depth analysis of Raptor codes performance introducing valuable suggestions to achieve efficient use of Raptor codes.},
keywords = {FEC, LTE, MBMS},
pubstate = {published},
tppubtype = {article}
}
Book Chapters
Bouras, Christos; Papazois, Andreas; Kokkinos, Vasileios; Tseliou, Georgia
Forward Error Correction for Reliable e-MBMS Transmissions in LTE Networks Book Chapter
In: Cellurar Networks, pp. 353 - 374, InTech, 2011.
Links | BibTeX | Tags: FEC, LTE, MBMS
@inbook{3144,
title = {Forward Error Correction for Reliable e-MBMS Transmissions in LTE Networks},
author = {Christos Bouras and Andreas Papazois and Vasileios Kokkinos and Georgia Tseliou},
url = {https://telematics.upatras.gr/wp-content/uploads/2024/01/7910FEC.pdf},
year = {2011},
date = {2011-01-01},
urldate = {2011-01-01},
booktitle = {Cellurar Networks},
pages = {353 - 374},
publisher = {InTech},
organization = {InTech},
keywords = {FEC, LTE, MBMS},
pubstate = {published},
tppubtype = {inbook}
}
Conferences
Bouras, Christos; Papazois, Andreas; Kokkinos, Vasileios; Kanakis, Nikos
Evaluating RaptorQ FEC over 3GPP Multicast Services Conference
The 8th International Wireless Communications & Mobile Computing Conference (IWCMC 2012), Limassol, Cyprus, pp. 257-262, 2012.
Abstract | Links | BibTeX | Tags: FEC, LTE, MBMS
@conference{2999,
title = {Evaluating RaptorQ FEC over 3GPP Multicast Services},
author = {Christos Bouras and Andreas Papazois and Vasileios Kokkinos and Nikos Kanakis},
url = {https://telematics.upatras.gr/wp-content/uploads/2024/01/4189046_7137.pdf},
year = {2012},
date = {2012-08-01},
urldate = {2012-08-01},
booktitle = {The 8th International Wireless Communications & Mobile Computing Conference (IWCMC 2012), Limassol, Cyprus, pp. 257-262},
pages = {257 - 262},
abstract = {Third Generation Partnership Project (3GPP) introduced Multimedia Broadcast/Multicast Services (MBMS), in order to efficiently deliver the same content to multiple users over mobile cellular networks. To enhance the download and streaming delivery robustness against packet losses, 3GPP proposes the use of Forward Error Correction (FEC) on the application layer. The Application Layer FEC (AL-FEC) scheme that 3GPP standardized is based on the systematic, fountain Raptor code. In this work, in response to the emergence of an enhanced FEC scheme, we provide a performance evaluation of the existing standardized AL-FEC scheme with the newly introduced RaptorQ code. troducing a variety of simulation experiments, we analyze the performance behavior of each AL-FEC scheme considering several FEC encoding parameters. Furthermore, we
try to verify the improvements that have emerged in AL-FEC providing enhanced capabilities in multicast services over next generation mobile networks.},
keywords = {FEC, LTE, MBMS},
pubstate = {published},
tppubtype = {conference}
}
try to verify the improvements that have emerged in AL-FEC providing enhanced capabilities in multicast services over next generation mobile networks.
Bouras, Christos; Papazois, Andreas; Kokkinos, Vasileios; Kanakis, Nikos
Enhaning Reliable Mobile Multicasting with RaptorQ FEC Conference
17th IEEE Symposium on Computers andCommunication (ISCC), Cappadocia, Turkey, pp. 82-87, 2012.
Abstract | Links | BibTeX | Tags: FEC, LTE, MBMS
@conference{3000,
title = {Enhaning Reliable Mobile Multicasting with RaptorQ FEC},
author = {Christos Bouras and Andreas Papazois and Vasileios Kokkinos and Nikos Kanakis},
url = {https://telematics.upatras.gr/4588is041/},
year = {2012},
date = {2012-07-01},
urldate = {2012-07-01},
booktitle = {17th IEEE Symposium on Computers andCommunication (ISCC), Cappadocia, Turkey, pp. 82-87},
pages = {82-87},
abstract = {A crucial point on the successful deployment of multicast services is the enhanced reliability by means of advanced error control schemes. To this direction Third Generation
Partnership Project (3GPP) has standardized exclusively for Multimedia Broadcast/Multicast Services (MBMS) the use of a Forward Error Correction (FEC) mechanism on the application layer based on Raptor codes. Since the standardized systematic, fountain Raptor code is now considered obsolete, the emergence of a new variant of Raptor codes, named RaptorQ, provides enhanced capabilities for mobile multicast services. In this paper, we provide a performance comparison of the standardized Raptor Application Layer FEC (AL-FEC) scheme with the very promising RaptorQ FEC code. We examine the enhancements that RaptorQ introduces on the AL-FEC protection robustness, providing a thorough performance analysis in comparison with the current Raptor FEC scheme. Furthermore, in order to verify the improved performance of RaptorQ, we provide several simulation results utilizing the ns-3 environment, considering the application of both the examined AL-FEC schemes over multicast services for next generation mobile networks.},
keywords = {FEC, LTE, MBMS},
pubstate = {published},
tppubtype = {conference}
}
Partnership Project (3GPP) has standardized exclusively for Multimedia Broadcast/Multicast Services (MBMS) the use of a Forward Error Correction (FEC) mechanism on the application layer based on Raptor codes. Since the standardized systematic, fountain Raptor code is now considered obsolete, the emergence of a new variant of Raptor codes, named RaptorQ, provides enhanced capabilities for mobile multicast services. In this paper, we provide a performance comparison of the standardized Raptor Application Layer FEC (AL-FEC) scheme with the very promising RaptorQ FEC code. We examine the enhancements that RaptorQ introduces on the AL-FEC protection robustness, providing a thorough performance analysis in comparison with the current Raptor FEC scheme. Furthermore, in order to verify the improved performance of RaptorQ, we provide several simulation results utilizing the ns-3 environment, considering the application of both the examined AL-FEC schemes over multicast services for next generation mobile networks.
Bouras, Christos; Papazois, Andreas; Kokkinos, Vasileios; Kanakis, Nikos
AL-FEC for Streaming Services over LTE Systems Conference
14th International Symposiumon Wireless Personal Multimedia Communications, Brest, France, pp. 284-288, 2011.
Abstract | Links | BibTeX | Tags: FEC, LTE, MBMS
@conference{2990,
title = {AL-FEC for Streaming Services over LTE Systems},
author = {Christos Bouras and Andreas Papazois and Vasileios Kokkinos and Nikos Kanakis},
url = {https://telematics.upatras.gr/4760pid1999633/},
year = {2011},
date = {2011-10-01},
urldate = {2011-10-01},
booktitle = {14th International Symposiumon Wireless Personal Multimedia Communications, Brest, France, pp. 284-288},
pages = {284-288},
abstract = {The Third Generation Partnership Project (3GPP), recently introduced the evolution of the third generation (3G) cellular networks, the Long Term Evolution (LTE) telecommunication system. A key aspect of LTE specifications is the enhancement of Multimedia Broadcast/Multicast Services (MBMS), where the same content is transmitted to multiple users located in a specific service area. A significant point of the demanding multimedia services is the enhancement of the robustness against packet losses. To this direction, in order to support the efficient point-to-multipoint download and streaming delivery, 3GPP has included an Application Layer Forward Error Correction (AL-FEC) scheme in the MBMS standard. The standardized AL-FEC scheme is based on the systematic, fountain Raptor codes. In this paper, we investigate the application of AL-FEC over the MBMS streaming delivery method. We consider the benefits of AL-FEC for a seamless multimedia streaming transmission to multiple mobile users and we examine how the amount of FEC overhead can be adjusted under different packet loss conditions. For this purpose, we present a variety of realistic simulation scenarios for the performance evaluation of FEC considering several network and FEC encoding parameters. Furthermore, we provide suggestions in order to achieve efficient use of Raptor codes over LTE MBMS streaming services.},
keywords = {FEC, LTE, MBMS},
pubstate = {published},
tppubtype = {conference}
}
Bouras, Christos; Alexiou, Antonios; Papazois, Andreas; Kokkinos, Vasileios; Asimakis, Konstantinos; Tseliou, Georgia
Reliable Multicasting over LTE: A Performance Study Conference
16th IEEE Symposioum on Computers and Communications (ISCC 2011), Kerkyra, Greece, pp. 603-608, 2011.
Abstract | Links | BibTeX | Tags: FEC, LTE, MBMS, MBSFN
@conference{2983,
title = {Reliable Multicasting over LTE: A Performance Study},
author = {Christos Bouras and Antonios Alexiou and Andreas Papazois and Vasileios Kokkinos and Konstantinos Asimakis and Georgia Tseliou},
url = {https://telematics.upatras.gr/2179cc_070/},
year = {2011},
date = {2011-06-01},
urldate = {2011-06-01},
booktitle = {16th IEEE Symposioum on Computers and Communications (ISCC 2011), Kerkyra, Greece, pp. 603-608},
pages = {603 - 608},
abstract = {With the booming of multimedia services, the 3rd Generation Partnership Project (3GPP) has introduced the evolved Multimedia Multicast/Broadcast Service (e-MBMS)
feature for LTE systems. The main objective of MBMS is to introduce real broadcast distribution capabilities into cellular systems. This purposed 3GPP to introduce the MBMS over a Single Frequency Network (MBSFN) operation. In this work we investigate the provision of MBMS service over a combination of MBSFN and PTM transmission schemes. We focus on the file repair procedure, because the distribution of binary data via MBMS must result in 100% error-free downloaded files. In order to achieve this goal, MBMS offers a Forward Error Correction (FEC) mechanism. Our simulation results show that there are some file repair schemes that achieve better performance as far as different network configurations are concerned. Furthermore, we compare all the file recovery methods and evaluate them against various network parameters in a realistic simulation environment.},
keywords = {FEC, LTE, MBMS, MBSFN},
pubstate = {published},
tppubtype = {conference}
}
feature for LTE systems. The main objective of MBMS is to introduce real broadcast distribution capabilities into cellular systems. This purposed 3GPP to introduce the MBMS over a Single Frequency Network (MBSFN) operation. In this work we investigate the provision of MBMS service over a combination of MBSFN and PTM transmission schemes. We focus on the file repair procedure, because the distribution of binary data via MBMS must result in 100% error-free downloaded files. In order to achieve this goal, MBMS offers a Forward Error Correction (FEC) mechanism. Our simulation results show that there are some file repair schemes that achieve better performance as far as different network configurations are concerned. Furthermore, we compare all the file recovery methods and evaluate them against various network parameters in a realistic simulation environment.
Bouras, Christos; Alexiou, Antonios; Papazois, Andreas; Kokkinos, Vasileios; Tseliou, Georgia
Enhancing FEC Application in LTE Cellular Networks Conference
IFIP Wireless Days 2010, Venice, Italy, pp. 1-5, 2010.
Abstract | Links | BibTeX | Tags: FEC, LTE, MBMS, MBSFN
@conference{2979,
title = {Enhancing FEC Application in LTE Cellular Networks},
author = {Christos Bouras and Antonios Alexiou and Andreas Papazois and Vasileios Kokkinos and Georgia Tseliou},
url = {https://telematics.upatras.gr/3883wd_2/},
year = {2010},
date = {2010-10-01},
urldate = {2010-10-01},
booktitle = {IFIP Wireless Days 2010, Venice, Italy, pp. 1-5},
pages = {1 - 5},
abstract = {3rd Generation Partnership Project?s (3GPP) Long Term Evolution (LTE) is focused on enhancing the Universal Terrestrial Radio Access (UTRA). Evolved-Multimedia Broadcast and Multicast Service (e-MBMS) uses Multimedia Broadcast over a Single Frequency Network (MBSFN) operation in order to improve its performance. In MBSFN operation, data are transmitted simultaneously over the air from multiple tightly time-synchronized cells. Raptor codes have been standardized as the main application layer Forward Error Correction (FEC) method for e-MBMS due to the advanced error protection they offer and their overall performance. In this study, we investigate the application of FEC in MBSFN-enabled LTE cellular networks and we propose a new scheme that takes into account the properties of MBSFN in order to provide a more efficient operation of FEC during e-MBMS transmissions. The proposed scheme is compared with other file recovery methods and is evaluated against various network parameters in a realistic simulation environment.},
keywords = {FEC, LTE, MBMS, MBSFN},
pubstate = {published},
tppubtype = {conference}
}
Bouras, Christos; Alexiou, Antonios; Papazois, Andreas; Kokkinos, Vasileios; Tsichritzis, George
Adopting FEC for Reliable Multicasting over LTE Networks Conference
13th ACM International Conference on Modeling Analysis and Simulation of Wireless and Mobile Systems, Bodrum, Turkey, pp. 307-310, 2010.
Abstract | Links | BibTeX | Tags: FEC, LTE, MBMS
@conference{2981,
title = {Adopting FEC for Reliable Multicasting over LTE Networks},
author = {Christos Bouras and Antonios Alexiou and Andreas Papazois and Vasileios Kokkinos and George Tsichritzis},
url = {https://telematics.upatras.gr/6262p307-alexiou/},
year = {2010},
date = {2010-10-01},
urldate = {2010-10-01},
booktitle = {13th ACM International Conference on Modeling Analysis and Simulation of Wireless and Mobile Systems, Bodrum, Turkey, pp. 307-310},
pages = {307 - 310},
abstract = {The key feature for the provision of Multimedia Broadcast/Multicast Services (MBMS) in Long Term Evolution (LTE) networks is the Multimedia Broadcast over a Single
Frequency Network (MBSFN). On the other hand, the use of Forward Error Correction (FEC) in mobile multicast transmission has significant advantages and the 3rd Generation Partnership Project (3GPP) has adopted the application layer FEC in the MBMS standard. In this paper, we investigate the impact of the application layer FEC over the MBSFN delivery method.},
keywords = {FEC, LTE, MBMS},
pubstate = {published},
tppubtype = {conference}
}
Frequency Network (MBSFN). On the other hand, the use of Forward Error Correction (FEC) in mobile multicast transmission has significant advantages and the 3rd Generation Partnership Project (3GPP) has adopted the application layer FEC in the MBMS standard. In this paper, we investigate the impact of the application layer FEC over the MBSFN delivery method.