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; Diles, Georgios; Kokkinos, Vasileios; Kontodimas, Konstantinos; Papazois, Andreas
A Simulation Framework for Evaluating Interference Mitigation Techniques in Heterogeneous Cellurar Environments Journal Article
In: Wireless Personal Communications, Springer Verlang, vol. 77, pp. 1213-1237, 2014.
Abstract | Links | BibTeX | Tags:
@article{3440,
title = {A Simulation Framework for Evaluating Interference Mitigation Techniques in Heterogeneous Cellurar Environments},
author = {Christos Bouras and Georgios Diles and Vasileios Kokkinos and Konstantinos Kontodimas and Andreas Papazois},
url = {https://telematics.upatras.gr/wpcfinal/},
year = {2014},
date = {2014-01-01},
urldate = {2014-01-01},
journal = {Wireless Personal Communications, Springer Verlang},
volume = {77},
pages = {1213-1237},
abstract = {Femtocells present an attractive solution for the improvement of a mobile network services providing better data rates and coverage. Since their deployment results to a heterogeneous network where two layers must utilize the available spectrum, issues of interference arise. A method to address this challenge, is investigating the locations of the newly installed FBS, and enforcing a power controlled transmission of all FBSs that achieves optimal and fair overall performance. Another option that becomes available in inter-cell interference cancellation (ICIC) macrocell environments, is utilizing the available spectrum to complete or partly avoid co-channel operation. In this work, we provide a simulation framework that allows the creation of custom, high configurable, user defined topologies of femtocells with power control and frequency allocation capabilities. It allows the investigation of the margin of improvement in interference when these methods are applied and may work as a decision tool for planning and evaluating heterogeneous networks. To showcase the frameworks
capabilities, we evaluate and study the behaviour of custom deployed femtocells/macrocells networks and examine the cross-tier interference issues. Facilitated by the framework, we enforce and evaluate each interference mitigation technique for different femtocells? deployment densities. Finally, we compare the results of each method in terms of total throughput, spectral efficiency and cell-edge users performance.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Femtocells present an attractive solution for the improvement of a mobile network services providing better data rates and coverage. Since their deployment results to a heterogeneous network where two layers must utilize the available spectrum, issues of interference arise. A method to address this challenge, is investigating the locations of the newly installed FBS, and enforcing a power controlled transmission of all FBSs that achieves optimal and fair overall performance. Another option that becomes available in inter-cell interference cancellation (ICIC) macrocell environments, is utilizing the available spectrum to complete or partly avoid co-channel operation. In this work, we provide a simulation framework that allows the creation of custom, high configurable, user defined topologies of femtocells with power control and frequency allocation capabilities. It allows the investigation of the margin of improvement in interference when these methods are applied and may work as a decision tool for planning and evaluating heterogeneous networks. To showcase the frameworks
capabilities, we evaluate and study the behaviour of custom deployed femtocells/macrocells networks and examine the cross-tier interference issues. Facilitated by the framework, we enforce and evaluate each interference mitigation technique for different femtocells? deployment densities. Finally, we compare the results of each method in terms of total throughput, spectral efficiency and cell-edge users performance.
capabilities, we evaluate and study the behaviour of custom deployed femtocells/macrocells networks and examine the cross-tier interference issues. Facilitated by the framework, we enforce and evaluate each interference mitigation technique for different femtocells? deployment densities. Finally, we compare the results of each method in terms of total throughput, spectral efficiency and cell-edge users performance.
Bouras, Christos; Antonis, Konstantinos; Diles, Georgios; Kokkinos, Vasileios; Loukopoulos, Leonidas
Economic Broadband Development through Infrastructure Sharing Journal Article
In: International Journal of Business Data Communications and Networking, IGI Global, vol. 10, pp. 21-42, 2014.
Abstract | Links | BibTeX | Tags:
@article{4106,
title = {Economic Broadband Development through Infrastructure Sharing},
author = {Christos Bouras and Konstantinos Antonis and Georgios Diles and Vasileios Kokkinos and Leonidas Loukopoulos},
url = {https://telematics.upatras.gr/economic-broadband-development-through-infrastructure-sharing/},
year = {2014},
date = {2014-01-01},
urldate = {2014-01-01},
journal = {International Journal of Business Data Communications and Networking, IGI Global},
volume = {10},
pages = {21-42},
abstract = {Broadband is a public utility with positive effects on competitiveness, employment and growth. Although evidence shows that broadband development is increasing, this increment is not homogeneous between urban and rural areas. The main factor is the high cost for deploying next generation networks in rural areas, and especially the cost linked to civil engineering works. In order to overcome the investment challenges arising in the context of broadband deployment, the European Commission made mandatory the sharing of existing telecommunication and non-telecommunication infrastructures and facilities. This manuscript proposes and presents a novel tool that enables the estimation of the expected savings from exploiting existing infrastructures when deploying a broadband network. This is followed by a number of general principles and recommendations that policy makers and national authorities could embrace to diminish deployment costs and promote broadband deployment.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Broadband is a public utility with positive effects on competitiveness, employment and growth. Although evidence shows that broadband development is increasing, this increment is not homogeneous between urban and rural areas. The main factor is the high cost for deploying next generation networks in rural areas, and especially the cost linked to civil engineering works. In order to overcome the investment challenges arising in the context of broadband deployment, the European Commission made mandatory the sharing of existing telecommunication and non-telecommunication infrastructures and facilities. This manuscript proposes and presents a novel tool that enables the estimation of the expected savings from exploiting existing infrastructures when deploying a broadband network. This is followed by a number of general principles and recommendations that policy makers and national authorities could embrace to diminish deployment costs and promote broadband deployment.
Bilios, Dimitrios; Bouras, Christos; Diles, Georgios; Kokkinos, Vasileios; Papazois, Andreas; Tseliou, Georgia
A Simulation Framework for the Evaluation of Frequency Reuse in LTE - A Systems Journal Article
In: International Journal of Wireless Networks and Broadband Technologies, IGI Global, vol. 3, pp. 56-83, 2014.
Abstract | Links | BibTeX | Tags:
@article{3439,
title = {A Simulation Framework for the Evaluation of Frequency Reuse in LTE - A Systems},
author = {Dimitrios Bilios and Christos Bouras and Georgios Diles and Vasileios Kokkinos and Andreas Papazois and Georgia Tseliou},
url = {https://telematics.upatras.gr/a-simulation-framework-for-the-evaluation-of-frequency-reuse-in-lte-a-systems/},
year = {2014},
date = {2014-01-01},
urldate = {2014-01-01},
journal = {International Journal of Wireless Networks and Broadband Technologies, IGI Global},
volume = {3},
pages = {56-83},
abstract = {Long Term Evolution Advanced (LTE-A) technology is considered as the most possible candidate for next generation mobile communications. LTE-A networks offer high capacity and are specified and designed to accommodate small, high performance, power-efficient end-user devices. Similarly to its predecessor LTE, LTE-A incorporates inter-cell interference mitigation methods in order to mitigate interference and to enhance efficiency in bandwidth usage. These methods include power and frequency allocation schemes that allow neighbouring cells and femtocells in heterogeneous networks to co-ordinately share and reuse available spectral resources, in order to avoid performance degradation for interference suffering cell-edge users. In this paper, we study the LTE-A multi-cell systems? performance using a simulation framework, which integrates several frequency reuse techniques and provides a user-friendly graphical presentation of the evaluation results. The optimal Fractional Frequency Reuse (FFR) configuration for the user-defined network instance is also determined, based on overall performance and fairness index metrics. Finally, we examine FFR techniques in two-tier femtocell/macrocell environments and evaluate them based on the optimization of different metrics, depending on the network operator?s needs.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Long Term Evolution Advanced (LTE-A) technology is considered as the most possible candidate for next generation mobile communications. LTE-A networks offer high capacity and are specified and designed to accommodate small, high performance, power-efficient end-user devices. Similarly to its predecessor LTE, LTE-A incorporates inter-cell interference mitigation methods in order to mitigate interference and to enhance efficiency in bandwidth usage. These methods include power and frequency allocation schemes that allow neighbouring cells and femtocells in heterogeneous networks to co-ordinately share and reuse available spectral resources, in order to avoid performance degradation for interference suffering cell-edge users. In this paper, we study the LTE-A multi-cell systems? performance using a simulation framework, which integrates several frequency reuse techniques and provides a user-friendly graphical presentation of the evaluation results. The optimal Fractional Frequency Reuse (FFR) configuration for the user-defined network instance is also determined, based on overall performance and fairness index metrics. Finally, we examine FFR techniques in two-tier femtocell/macrocell environments and evaluate them based on the optimization of different metrics, depending on the network operator?s needs.
Bouras, Christos; Filopoulos, Anestis; Kokkinos, Vasileios; Michalopoulos, Sotiris; Papadopoulos, Dimitris; Tseliou, Georgia
Policy recommendations for public administrators on free and open source software usage Journal Article
In: Telematics and Informatics, Elsevier Science, vol. 31, 2014.
Abstract | Links | BibTeX | Tags:
@article{3443,
title = {Policy recommendations for public administrators on free and open source software usage},
author = {Christos Bouras and Anestis Filopoulos and Vasileios Kokkinos and Sotiris Michalopoulos and Dimitris Papadopoulos and Georgia Tseliou},
url = {https://telematics.upatras.gr/30291-s2-0-s0736585313000361-main/},
year = {2014},
date = {2014-01-01},
urldate = {2014-01-01},
journal = {Telematics and Informatics, Elsevier Science},
volume = {31},
abstract = {Free and open source software, holding a strategic position in knowledge economy, reaffirms the critical role of governments and regional authorities in establishing strategies for integrating effective and sustainable Information Technology solutions in the public sector towards economic growth and social welfare. Moreover, public services, organizations and territorial administrations collectively represent a major software user with great impact on the software market. In this sense, software selection in the public sector is a highly political and strategic process; various collateral implications and policy aspects should be considered in order to reach the best possible decisions. Within this context, this manuscript provides policy recommendations on issues and challenges pertaining to the use of free and open source software by European public administrations. The recommended policy actions are mainly based on review of the current policy framework. The main goal of this manuscript is to contribute in providing policy orientations and proposing actions that can help governments, public administrations and European institutions fully harvest the benefits of open source.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Free and open source software, holding a strategic position in knowledge economy, reaffirms the critical role of governments and regional authorities in establishing strategies for integrating effective and sustainable Information Technology solutions in the public sector towards economic growth and social welfare. Moreover, public services, organizations and territorial administrations collectively represent a major software user with great impact on the software market. In this sense, software selection in the public sector is a highly political and strategic process; various collateral implications and policy aspects should be considered in order to reach the best possible decisions. Within this context, this manuscript provides policy recommendations on issues and challenges pertaining to the use of free and open source software by European public administrations. The recommended policy actions are mainly based on review of the current policy framework. The main goal of this manuscript is to contribute in providing policy orientations and proposing actions that can help governments, public administrations and European institutions fully harvest the benefits of open source.
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}
}
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.
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}
}
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.
Bouras, Christos; Papazois, Andreas; Kokkinos, Vasileios; Tseliou, Georgia; Bilios, Dimitrios
Selecting the Optimal Fractional Frequency Reuse Scheme in Long Term Evolution Networks Journal Article
In: Wireless Personal Communications, Springer Verlang, pp. 2693-2712, vol. 71, pp. 2693-2712, 2013.
Abstract | Links | BibTeX | Tags: FFR
@article{3121,
title = {Selecting the Optimal Fractional Frequency Reuse Scheme in Long Term Evolution Networks},
author = {Christos Bouras and Andreas Papazois and Vasileios Kokkinos and Georgia Tseliou and Dimitrios Bilios},
url = {https://telematics.upatras.gr/2659wpc10-1007_s11277-012-0965-z/},
year = {2013},
date = {2013-01-01},
urldate = {2013-01-01},
journal = {Wireless Personal Communications, Springer Verlang, pp. 2693-2712},
volume = {71},
pages = {2693-2712},
abstract = {Long Term Evolution (LTE) networks offer high capacity and are specified and designed to accommodate small, high performance, power-efficient end-user devices. One limiting factor that influences LTE performance is the interference from neighbouring cells, the so called Inter-Cell Interference (ICI). The investigation of ICI mitigation techniques has become a key focus area in achieving dense spectrum reuse in next generation cellular systems. Fractional Frequency Reuse (FFR) has been proposed as a technique to overcome this problem, since it can efficiently utilize the available frequency spectrum. This manuscript proposes a dynamic mechanism that selects the optimal FFR scheme based on a custom metric, which is called user satisfaction. In detail, the proposed mechanism divides the cell into two regions, the inner and outer region, and selects the optimal size as well as the optimal frequency allocation between these regions with main target to maximize the user satisfaction metric. The proposed mechanism is evaluated through several simulation scenarios that incorporate users? mobility and its selected FFR scheme is compared with other frequency reuse schemes in order to highlight its performance.},
keywords = {FFR},
pubstate = {published},
tppubtype = {article}
}
Long Term Evolution (LTE) networks offer high capacity and are specified and designed to accommodate small, high performance, power-efficient end-user devices. One limiting factor that influences LTE performance is the interference from neighbouring cells, the so called Inter-Cell Interference (ICI). The investigation of ICI mitigation techniques has become a key focus area in achieving dense spectrum reuse in next generation cellular systems. Fractional Frequency Reuse (FFR) has been proposed as a technique to overcome this problem, since it can efficiently utilize the available frequency spectrum. This manuscript proposes a dynamic mechanism that selects the optimal FFR scheme based on a custom metric, which is called user satisfaction. In detail, the proposed mechanism divides the cell into two regions, the inner and outer region, and selects the optimal size as well as the optimal frequency allocation between these regions with main target to maximize the user satisfaction metric. The proposed mechanism is evaluated through several simulation scenarios that incorporate users? mobility and its selected FFR scheme is compared with other frequency reuse schemes in order to highlight its performance.
Bouras, Christos; Alexiou, Antonios; Papazois, Andreas; Kokkinos, Vasileios; Tsichritzis, George
Modulation and coding scheme selection in multimedia broadcast over a single frequency network-enabled long-term evolution networks Journal Article
In: International Journal of Communication Systems, Wiley InterScience, pp. 1603-1619, vol. 25, pp. 1603-1619, 2013.
Abstract | Links | BibTeX | Tags: LTE, MBSFN, MCS
@article{3105,
title = {Modulation and coding scheme selection in multimedia broadcast over a single frequency network-enabled long-term evolution networks},
author = {Christos Bouras and Antonios Alexiou and Andreas Papazois and Vasileios Kokkinos and George Tsichritzis},
url = {https://telematics.upatras.gr/1745ijcs2012dac1326/},
year = {2013},
date = {2013-01-01},
urldate = {2013-01-01},
journal = {International Journal of Communication Systems, Wiley InterScience, pp. 1603-1619},
volume = {25},
pages = {1603-1619},
abstract = {Long term evolution constitutes the next generation cellular network beyond 3G that is designed to support the explosion in demand for bandwidth-hungry multimedia services in wireless networks by providing an extremely high performance radio access technology. To support multimedia broadcast/multicast services (MBMS), long term evolution offers the functionality to transmit MBMS over a single frequency network, where a time-synchronized common waveform is transmitted from multiple cells for a given duration. This enables over-the-air combining, thus significantly improving the spectral efficiency (SE) compared with conventional MBMS operations. In MBMS over a single frequency network transmissions, the achieved SE is mainly determined by the modulation and coding scheme selected. This study proposes and evaluates four approaches for the selection of the modulation and coding scheme. Each approach corresponds to different users? distribution and multimedia traffic conditions. On the basis of SE measurements, we determine the approach that either maximizes or achieves a target SE for the corresponding users distribution and traffic conditions. Copyright © 2011 John Wiley & Sons, Ltd.},
keywords = {LTE, MBSFN, MCS},
pubstate = {published},
tppubtype = {article}
}
Long term evolution constitutes the next generation cellular network beyond 3G that is designed to support the explosion in demand for bandwidth-hungry multimedia services in wireless networks by providing an extremely high performance radio access technology. To support multimedia broadcast/multicast services (MBMS), long term evolution offers the functionality to transmit MBMS over a single frequency network, where a time-synchronized common waveform is transmitted from multiple cells for a given duration. This enables over-the-air combining, thus significantly improving the spectral efficiency (SE) compared with conventional MBMS operations. In MBMS over a single frequency network transmissions, the achieved SE is mainly determined by the modulation and coding scheme selected. This study proposes and evaluates four approaches for the selection of the modulation and coding scheme. Each approach corresponds to different users? distribution and multimedia traffic conditions. On the basis of SE measurements, we determine the approach that either maximizes or achieves a target SE for the corresponding users distribution and traffic conditions. Copyright © 2011 John Wiley & Sons, Ltd.
Bouras, Christos; Kokkinos, Vasileios; Tseliou, Georgia
Methodology for Public Administrators for Selecting between Open Source and Proprietary Software Journal Article
In: Journal of Telematics and Informatics, Elsevier Science, pp. 100-110, pp. 100 - 110, 2013.
Abstract | Links | BibTeX | Tags:
@article{3115,
title = {Methodology for Public Administrators for Selecting between Open Source and Proprietary Software},
author = {Christos Bouras and Vasileios Kokkinos and Georgia Tseliou},
url = {https://telematics.upatras.gr/75521-s2-0-s073658531200024x-main/},
year = {2013},
date = {2013-01-01},
urldate = {2013-01-01},
journal = {Journal of Telematics and Informatics, Elsevier Science, pp. 100-110},
pages = {100 - 110},
abstract = {The public sector needs to change over to communicating digitally. This development makes great demands both on work processes in the public sector and on the Information Technology systems, on which e-government is based. From the economic perspective, the change-over poses great challenges, as huge investments will have to be made in Information Technology in the public sector. It is therefore natural, in connection with these investments, for a detailed assessment to be made of what forms of technology it is anticipated to be used, and who controls the development and ownership of this technology. The question is: to what extent Free and Open Source Software can supplement or completely replace proprietary software? This work constitutes a review of literature on pre-existing comparative studies regarding the technical, social, economic and organizational factors on Free and Open Source Software usage. Furthermore, this work includes guidelines that Public Administrations should follow for the selection between open source and proprietary software. Our goal is to help public stakeholders understand the technical/social/economic/organizational environment and therefore reach informed decisions when selecting the appropriate software. The manuscript can also be useful for Free and Open Source Software developers, users and communities who are either directly or indirectly involved in the software market.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The public sector needs to change over to communicating digitally. This development makes great demands both on work processes in the public sector and on the Information Technology systems, on which e-government is based. From the economic perspective, the change-over poses great challenges, as huge investments will have to be made in Information Technology in the public sector. It is therefore natural, in connection with these investments, for a detailed assessment to be made of what forms of technology it is anticipated to be used, and who controls the development and ownership of this technology. The question is: to what extent Free and Open Source Software can supplement or completely replace proprietary software? This work constitutes a review of literature on pre-existing comparative studies regarding the technical, social, economic and organizational factors on Free and Open Source Software usage. Furthermore, this work includes guidelines that Public Administrations should follow for the selection between open source and proprietary software. Our goal is to help public stakeholders understand the technical/social/economic/organizational environment and therefore reach informed decisions when selecting the appropriate software. The manuscript can also be useful for Free and Open Source Software developers, users and communities who are either directly or indirectly involved in the software market.
Bouras, Christos; Alexiou, Antonios; Kokkinos, Vasileios; Tsichritzis, George
Performance Evaluation of LTE for MBSFN Transmissions Journal Article
In: Wireless Networks, Springer Verlang, pp. 227-240, vol. 18, pp. 227-240, 2012.
Abstract | Links | BibTeX | Tags: LTE, MBSFN
@article{3104,
title = {Performance Evaluation of LTE for MBSFN Transmissions},
author = {Christos Bouras and Antonios Alexiou and Vasileios Kokkinos and George Tsichritzis},
url = {https://telematics.upatras.gr/2568winet1/},
year = {2012},
date = {2012-01-01},
urldate = {2012-01-01},
journal = {Wireless Networks, Springer Verlang, pp. 227-240},
volume = {18},
pages = {227-240},
abstract = {Long Term Evolution (LTE) is the most promised latest step towards the 4th generation (4G) of radio technologies designed to increase the capacity and speed of mobile communications with main target the support of the so-called “Mobile Broadband”. To support Multimedia Broadcast/Multicast Services (MBMS), LTE offers the possibility to transmit Multimedia Broadcast multicast service over a Single Frequency Network (MBSFN), where a time-synchronized common waveform is transmitted from multiple cells for a given duration. In this manuscript we analytically present the MBSFN delivery method and evaluate its performance. The critical parameters of primary interest for the evaluation of the scheme are the packet delivery cost and its scalability. To this direction, a telecommunication cost analysis of the MBMS service is presented based on the transmission cost over the air interface, as well as the costs of all interfaces and nodes of the MBSFN architecture. Based on this cost analysis we determine the ideal number of cells that should participate in the MBSFN transmission in order to improve the overall MBSFN performance. Since the performance of the MBSFN scheme mainly depends on the configuration of the LTE network that is under investigation, we consider different network topologies, MBSFN deployments and user distributions.},
keywords = {LTE, MBSFN},
pubstate = {published},
tppubtype = {article}
}
Long Term Evolution (LTE) is the most promised latest step towards the 4th generation (4G) of radio technologies designed to increase the capacity and speed of mobile communications with main target the support of the so-called “Mobile Broadband”. To support Multimedia Broadcast/Multicast Services (MBMS), LTE offers the possibility to transmit Multimedia Broadcast multicast service over a Single Frequency Network (MBSFN), where a time-synchronized common waveform is transmitted from multiple cells for a given duration. In this manuscript we analytically present the MBSFN delivery method and evaluate its performance. The critical parameters of primary interest for the evaluation of the scheme are the packet delivery cost and its scalability. To this direction, a telecommunication cost analysis of the MBMS service is presented based on the transmission cost over the air interface, as well as the costs of all interfaces and nodes of the MBSFN architecture. Based on this cost analysis we determine the ideal number of cells that should participate in the MBSFN transmission in order to improve the overall MBSFN performance. Since the performance of the MBSFN scheme mainly depends on the configuration of the LTE network that is under investigation, we consider different network topologies, MBSFN deployments and user distributions.
Bouras, Christos; Alexiou, Antonios; Papazois, Andreas; Kokkinos, Vasileios; Asimakis, Konstantinos; Tseliou, Georgia
Cost Optimization of MBSFN and PTM Transmissions for Reliable Multicasting in LTE Networks Journal Article
In: Wireless Networks, Springer Verlang, pp. 277-293, pp. 277-293, 2012.
Abstract | Links | BibTeX | Tags: Cost analysis, LTE, MBSFN
@article{3109,
title = {Cost Optimization of MBSFN and PTM Transmissions for Reliable Multicasting in LTE Networks},
author = {Christos Bouras and Antonios Alexiou and Andreas Papazois and Vasileios Kokkinos and Konstantinos Asimakis and Georgia Tseliou},
url = {https://telematics.upatras.gr/5966winet2/},
year = {2012},
date = {2012-01-01},
urldate = {2012-01-01},
journal = {Wireless Networks, Springer Verlang, pp. 277-293},
pages = {277-293},
abstract = {Long Term Evolution (LTE) systems have been specified and designed to accommodate small, high performance, power-efficient, end-user devices. The evolved Multimedia Broadcast/Multicast Service (e-MBMS) feature is introduced by the 3rd Generation Partnership Project (3GPP) as a complement to the existing MBMS service in order to accommodate multicast groups that are interested in receiving the same data. MBMS service is provided by MBMS over a Single Frequency Network (MBSFN) and/or Point-To-Multipoint (PTM) transmission methods. One of the challenges of MBMS is the complete error recovery of the transmitted files, a matter of great importance since the distribution of binary data must result in 100% error-free download. To fulfill this tight requirement, Forward Error Correction (FEC) mechanism has been proposed by 3GPP. In this work, we investigate the reliable multicasting by introducing a transmission method that combines the advantages of MBSFN and PTM transmission methods. We compare several FEC-based file recovery methods and evaluate them against various network parameters in a realistic simulation environment. The comparison is based on a cost-oriented analysis of MBMS service that takes into account the transmission cost over all the interfaces and nodes of the LTE architecture. The simulation results are performed with the aid of a new simulation tool and show that the performance of the file repair schemes depend on the network configuration.
KEYWORDS: multimedia multicasting; cellular networks; forward error correction; reliability; single frequency network; optimization; point to multipoint;},
keywords = {Cost analysis, LTE, MBSFN},
pubstate = {published},
tppubtype = {article}
}
Long Term Evolution (LTE) systems have been specified and designed to accommodate small, high performance, power-efficient, end-user devices. The evolved Multimedia Broadcast/Multicast Service (e-MBMS) feature is introduced by the 3rd Generation Partnership Project (3GPP) as a complement to the existing MBMS service in order to accommodate multicast groups that are interested in receiving the same data. MBMS service is provided by MBMS over a Single Frequency Network (MBSFN) and/or Point-To-Multipoint (PTM) transmission methods. One of the challenges of MBMS is the complete error recovery of the transmitted files, a matter of great importance since the distribution of binary data must result in 100% error-free download. To fulfill this tight requirement, Forward Error Correction (FEC) mechanism has been proposed by 3GPP. In this work, we investigate the reliable multicasting by introducing a transmission method that combines the advantages of MBSFN and PTM transmission methods. We compare several FEC-based file recovery methods and evaluate them against various network parameters in a realistic simulation environment. The comparison is based on a cost-oriented analysis of MBMS service that takes into account the transmission cost over all the interfaces and nodes of the LTE architecture. The simulation results are performed with the aid of a new simulation tool and show that the performance of the file repair schemes depend on the network configuration.
KEYWORDS: multimedia multicasting; cellular networks; forward error correction; reliability; single frequency network; optimization; point to multipoint;
KEYWORDS: multimedia multicasting; cellular networks; forward error correction; reliability; single frequency network; optimization; point to multipoint;
Bouras, Christos; Alexiou, Antonios; Kokkinos, Vasileios
Exploiting MIMO Technology for Optimal MBMS Power Allocation Journal Article
In: Wireless Personal Communications, Springer Verlang, pp. 447-464, pp. 447-464, 2011.
Abstract | Links | BibTeX | Tags:
@article{3100,
title = {Exploiting MIMO Technology for Optimal MBMS Power Allocation},
author = {Christos Bouras and Antonios Alexiou and Vasileios Kokkinos},
url = {https://telematics.upatras.gr/3150fulltextwpc/},
year = {2011},
date = {2011-01-01},
urldate = {2011-01-01},
journal = {Wireless Personal Communications, Springer Verlang, pp. 447-464},
pages = {447-464},
abstract = {In mobile networks, the provision of rich multimedia services, such as Mobile TV, is considered of key importance. To this end, Multimedia Broadcast/Multicast Service (MBMS) - that was introduced in the Release 6 of Universal Mobile Telecommunication System (UMTS) - is envisaged to play an instrumental role in the proliferation of mobile market. The reason behind the design of MBMS was the need to provide multiple users with the same data at the same time in 3GPP (3rd Generation Partnership Project) cellular networks. Still, MBMS performance is limited by the base stations? transmission power. As an aftermath, efficient power allocation techniques should be implemented so as to ensure the mass provision of multimedia applications to mobile users. This paper proposes a novel mechanism for efficient radio bearer selection during MBMS transmissions. The proposed mechanism is based on the concept of transport channels combination in any cell of the network. Furthermore, the mechanism exploits the performance enhancements emerged from Multiple Input Multiple Output (MIMO) antennas and manages to efficiently deliver multiple MBMS sessions. The proposed mechanism is thoroughly evaluated and compared with the radio bearer selection mechanisms proposed by 3GPP.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
In mobile networks, the provision of rich multimedia services, such as Mobile TV, is considered of key importance. To this end, Multimedia Broadcast/Multicast Service (MBMS) - that was introduced in the Release 6 of Universal Mobile Telecommunication System (UMTS) - is envisaged to play an instrumental role in the proliferation of mobile market. The reason behind the design of MBMS was the need to provide multiple users with the same data at the same time in 3GPP (3rd Generation Partnership Project) cellular networks. Still, MBMS performance is limited by the base stations? transmission power. As an aftermath, efficient power allocation techniques should be implemented so as to ensure the mass provision of multimedia applications to mobile users. This paper proposes a novel mechanism for efficient radio bearer selection during MBMS transmissions. The proposed mechanism is based on the concept of transport channels combination in any cell of the network. Furthermore, the mechanism exploits the performance enhancements emerged from Multiple Input Multiple Output (MIMO) antennas and manages to efficiently deliver multiple MBMS sessions. The proposed mechanism is thoroughly evaluated and compared with the radio bearer selection mechanisms proposed by 3GPP.
Bouras, Christos; Alexiou, Antonios; Kokkinos, Vasileios; Rekkas, Evangelos
An Improved Mechanism for Multiple MBMS Sessions Assignment in B3G Cellurar Networks Journal Article
In: Wireless Networks, Springer Verlang, pp. 671-686, vol. 16, pp. 671 - 686, 2010.
Abstract | Links | BibTeX | Tags: MBMS, Power Control, UMTS
@article{3088,
title = {An Improved Mechanism for Multiple MBMS Sessions Assignment in B3G Cellurar Networks},
author = {Christos Bouras and Antonios Alexiou and Vasileios Kokkinos and Evangelos Rekkas},
url = {https://telematics.upatras.gr/3071winet/},
year = {2010},
date = {2010-01-01},
urldate = {2010-01-01},
journal = {Wireless Networks, Springer Verlang, pp. 671-686},
volume = {16},
pages = {671 - 686},
abstract = {In Universal Mobile Telecommunication System (UMTS), the downlink capacity is limited by the base station transmission power. Therefore, power control plays an important role to minimize the transmitted power shared among unicast and multicast users within a cell. In Multimedia Broadcast/Multicast Service (MBMS), power control targets to the efficient utilization of radio and network resources. However, the expected high demand for such services stresses the need for an efficient scheme, capable of dynamically allocating radio resources to parallel MBMS sessions. This paper proposes a power control mechanism for efficient MBMS session assignment in next generation UMTS networks. The mechanism shares efficiently the available power resources of UMTS base stations to MBMS sessions running in the network. Furthermore, the mechanism is evaluated through several realistic scenarios and the results indicate the ability of the mechanism to utilize efficiently the radio resources and to ensure the service continuity when parallel MBMS services run in the network. Our approach is compared with current 3rd Generation Partnership Project (3GPP) approaches, such as these presented in TS 25.346 and in TR 25.922, in order to highlight the enhancements that it provides.},
keywords = {MBMS, Power Control, UMTS},
pubstate = {published},
tppubtype = {article}
}
In Universal Mobile Telecommunication System (UMTS), the downlink capacity is limited by the base station transmission power. Therefore, power control plays an important role to minimize the transmitted power shared among unicast and multicast users within a cell. In Multimedia Broadcast/Multicast Service (MBMS), power control targets to the efficient utilization of radio and network resources. However, the expected high demand for such services stresses the need for an efficient scheme, capable of dynamically allocating radio resources to parallel MBMS sessions. This paper proposes a power control mechanism for efficient MBMS session assignment in next generation UMTS networks. The mechanism shares efficiently the available power resources of UMTS base stations to MBMS sessions running in the network. Furthermore, the mechanism is evaluated through several realistic scenarios and the results indicate the ability of the mechanism to utilize efficiently the radio resources and to ensure the service continuity when parallel MBMS services run in the network. Our approach is compared with current 3rd Generation Partnership Project (3GPP) approaches, such as these presented in TS 25.346 and in TR 25.922, in order to highlight the enhancements that it provides.
Bouras, Christos; Alexiou, Antonios; Kokkinos, Vasileios; Rekkas, Evangelos
Cost Analysis and Efficient Radio Bearer Selection for Multicasting over UMTS Journal Article
In: Wireless Communications and Mobile Computing, Wiley InterScience, pp. 1159 - 1172, 2009.
Abstract | Links | BibTeX | Tags: Cost analysis, MBMS, Power Control, UMTS
@article{3084,
title = {Cost Analysis and Efficient Radio Bearer Selection for Multicasting over UMTS},
author = {Christos Bouras and Antonios Alexiou and Vasileios Kokkinos and Evangelos Rekkas},
url = {https://telematics.upatras.gr/2561fulltext/},
year = {2009},
date = {2009-01-01},
urldate = {2009-01-01},
journal = {Wireless Communications and Mobile Computing, Wiley InterScience},
pages = {1159 - 1172},
abstract = {Along with the widespread deployment of the Third Generation (3G) cellular networks, the fast-improving capabilities of the mobile devices, content, and service providers are increasingly interested in supporting multicast communications over wireless networks and in particular over Universal Mobile Telecommunications System (UMTS). To this direction, the Third Generation Partnership Project (3GPP) is currently standardizing the Multimedia Broadcast/Multicast Service (MBMS) framework of UMTS. In this paper, we present an overview of the MBMS multicast mode of UMTS. We analytically present the multicast mode of the MBMS and analyze its performance in terms of packet delivery cost under various network topologies, cell types, and multicast users distributions. Furthermore, for the evaluation of the scheme, we consider different transport channels for the transmission of the multicast data over the UMTS Terrestrial Radio-Access Network (UTRAN) interfaces. Finally, we propose a scheme for the efficient radio bearer selection that minimizes total packet delivery cost.},
keywords = {Cost analysis, MBMS, Power Control, UMTS},
pubstate = {published},
tppubtype = {article}
}
Along with the widespread deployment of the Third Generation (3G) cellular networks, the fast-improving capabilities of the mobile devices, content, and service providers are increasingly interested in supporting multicast communications over wireless networks and in particular over Universal Mobile Telecommunications System (UMTS). To this direction, the Third Generation Partnership Project (3GPP) is currently standardizing the Multimedia Broadcast/Multicast Service (MBMS) framework of UMTS. In this paper, we present an overview of the MBMS multicast mode of UMTS. We analytically present the multicast mode of the MBMS and analyze its performance in terms of packet delivery cost under various network topologies, cell types, and multicast users distributions. Furthermore, for the evaluation of the scheme, we consider different transport channels for the transmission of the multicast data over the UMTS Terrestrial Radio-Access Network (UTRAN) interfaces. Finally, we propose a scheme for the efficient radio bearer selection that minimizes total packet delivery cost.
Bouras, Christos; Alexiou, Antonios; Kokkinos, Vasileios
Evaluation of Different Power Saving Techniques for MBMS Services Journal Article
In: EURASIP Journal on Wireless Communications and Networking, Hindawi Publishing Corporation, pp. 1 - 15, 2009.
Abstract | Links | BibTeX | Tags: LTE, MBMS, Power Control
@article{3091,
title = {Evaluation of Different Power Saving Techniques for MBMS Services},
author = {Christos Bouras and Antonios Alexiou and Vasileios Kokkinos},
url = {https://telematics.upatras.gr/1516785927/},
year = {2009},
date = {2009-01-01},
urldate = {2009-01-01},
journal = {EURASIP Journal on Wireless Communications and Networking, Hindawi Publishing Corporation},
pages = {1 - 15},
abstract = {Over the last years we have witnessed an explosive growth of multimedia computing, wireless communication and applications. Following the rapid increase in penetration rate of broadband services, the Third Generation Partnership Project (3GPP) is currently standardizing the Evolved-Multimedia Broadcast/Multicast Service (E-MBMS) framework of Long Term Evolution (LTE), the successor ofUniversalMobile Telecommunications System (UMTS).MBMS constitutes a point-to-multipoint downlink bearer service that was designed to significantly decrease the required radio and wired link resources. However, several obstacles regarding the high-power requirements should be overcome for the realization of MBMS. Techniques, such as Macrodiversity Combining and Rate Splitting, could be utilized to reduce the power requirement of delivering multicast traffic toMBMS users. In this paper, we analytically present several power saving techniques and analyze their performance in terms of power consumption. We provide simulation results that reveal the amount of power that is saved and reinforce the need for the usage of such techniques.},
keywords = {LTE, MBMS, Power Control},
pubstate = {published},
tppubtype = {article}
}
Over the last years we have witnessed an explosive growth of multimedia computing, wireless communication and applications. Following the rapid increase in penetration rate of broadband services, the Third Generation Partnership Project (3GPP) is currently standardizing the Evolved-Multimedia Broadcast/Multicast Service (E-MBMS) framework of Long Term Evolution (LTE), the successor ofUniversalMobile Telecommunications System (UMTS).MBMS constitutes a point-to-multipoint downlink bearer service that was designed to significantly decrease the required radio and wired link resources. However, several obstacles regarding the high-power requirements should be overcome for the realization of MBMS. Techniques, such as Macrodiversity Combining and Rate Splitting, could be utilized to reduce the power requirement of delivering multicast traffic toMBMS users. In this paper, we analytically present several power saving techniques and analyze their performance in terms of power consumption. We provide simulation results that reveal the amount of power that is saved and reinforce the need for the usage of such techniques.
Conferences
Tsachrelias, Konstantinos; Katsigiannis, Chrysostomos-Athanasios; Kokkinos, Vasileios; Gkamas, Apostolos; Bouras, Christos; Pouyioutas, Philippos
Robust Protection of 5G MIMO Networks from Jamming Attacks via Adaptive Beamforming Conference
20th International Conference on Future Networks and Communications (FNC 2025), August 4 - 6, 2025, Leuven, Belgium, 2025, ((to appear)).
Abstract | Links | BibTeX | Tags:
@conference{nokey,
title = {Robust Protection of 5G MIMO Networks from Jamming Attacks via Adaptive Beamforming},
author = {Konstantinos Tsachrelias and Chrysostomos-Athanasios Katsigiannis and Vasileios Kokkinos and Apostolos Gkamas and Christos Bouras and Philippos Pouyioutas },
url = {https://telematics.upatras.gr/fnc2025_bouras/},
year = {2025},
date = {2025-08-04},
booktitle = {20th International Conference on Future Networks and Communications (FNC 2025), August 4 - 6, 2025, Leuven, Belgium},
abstract = {Ensuring reliable and secure communication in 5G networks is critical, especially against jamming attacks that can significantly impair network performance. This paper presents a method to enhance the resilience of 5G Multiple Input Multiple Output (MIMO) networks through adaptive beamforming, specifically targeting jamming mitigation. The approach involves dynamically adjusting signal transmission direction to differentiate between legitimate communication and interference. Simulation results demonstrate that adaptive beamforming effectively reduces the impact of jamming, maintaining service quality even under adverse conditions. This method provides a practical and scalable solution for improving the security of 5G networks, addressing a key challenge in wireless communication systems. },
note = {(to appear)},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Ensuring reliable and secure communication in 5G networks is critical, especially against jamming attacks that can significantly impair network performance. This paper presents a method to enhance the resilience of 5G Multiple Input Multiple Output (MIMO) networks through adaptive beamforming, specifically targeting jamming mitigation. The approach involves dynamically adjusting signal transmission direction to differentiate between legitimate communication and interference. Simulation results demonstrate that adaptive beamforming effectively reduces the impact of jamming, maintaining service quality even under adverse conditions. This method provides a practical and scalable solution for improving the security of 5G networks, addressing a key challenge in wireless communication systems.
Katsigiannis, Chrysostomos-Athanasios; Tsachrelias, Konstantinos; Kokkinos, Vasileios; Gkamas, Apostolos; Bouras, Christos; Pouyioutas, Philippos
Evaluating Security Techniques in 5G MIMO - Based IoT Networks Conference
The 16th International Conference on Ubiquitous Networks (ICUFN2025), Lisbon, Portugal , 2025, (to appear).
Abstract | Links | BibTeX | Tags:
@conference{nokey,
title = {Evaluating Security Techniques in 5G MIMO - Based IoT Networks},
author = {Chrysostomos-Athanasios Katsigiannis and Konstantinos Tsachrelias and Vasileios Kokkinos and Apostolos Gkamas and Christos Bouras and Philippos Pouyioutas },
url = {https://telematics.upatras.gr/icufn2025_2_camera_ready/},
year = {2025},
date = {2025-07-11},
booktitle = {The 16th International Conference on Ubiquitous Networks (ICUFN2025)},
address = {Lisbon, Portugal },
abstract = {The rapid expansion of Internet of Things (IoT) devices in various sectors, from healthcare to industrial automation, has heightened the need for secure and efficient communication networks. Multiple Input Multiple Output (MIMO) systems, integral to 5G networks, offer high throughput and low latency essential for real-time IoT applications. However, the integration of robust security mechanisms into MIMO systems often leads to increased latency, potentially undermining the performance of timesensitive IoT applications. This paper proposes a framework for enhancing the security of MIMO networks specifically designed for IoT environments while maintaining ultra-low latency. The study explores lightweight encryption techniques, physical layer security methods, and optimized beamforming strategies that collectively safeguard data integrity and confidentiality without compromising network performance. Through theoretical analysis and extensive simulations, this research demonstrates
that it is possible to achieve a secure MIMO-based IoT network that balances both latency and security requirements.},
note = {to appear},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
The rapid expansion of Internet of Things (IoT) devices in various sectors, from healthcare to industrial automation, has heightened the need for secure and efficient communication networks. Multiple Input Multiple Output (MIMO) systems, integral to 5G networks, offer high throughput and low latency essential for real-time IoT applications. However, the integration of robust security mechanisms into MIMO systems often leads to increased latency, potentially undermining the performance of timesensitive IoT applications. This paper proposes a framework for enhancing the security of MIMO networks specifically designed for IoT environments while maintaining ultra-low latency. The study explores lightweight encryption techniques, physical layer security methods, and optimized beamforming strategies that collectively safeguard data integrity and confidentiality without compromising network performance. Through theoretical analysis and extensive simulations, this research demonstrates
that it is possible to achieve a secure MIMO-based IoT network that balances both latency and security requirements.
that it is possible to achieve a secure MIMO-based IoT network that balances both latency and security requirements.
Diasakos, Damianos; Prodromos, Nikolaos; Gkamas, Apostolos; Kokkinos, Vasileios; Bouras, Christos; Pouyioutas, Philippos
Comparative Analysis for Doppler Shift Prediction in High - Speed 5G Scenarios Conference
he 16th International Conference on Ubiquitous Networks (ICUFN 2025), Lisbon, Portugal , 2025, (to appear).
Abstract | Links | BibTeX | Tags:
@conference{nokey,
title = {Comparative Analysis for Doppler Shift Prediction in High - Speed 5G Scenarios},
author = {Damianos Diasakos and Nikolaos Prodromos and Apostolos Gkamas and Vasileios Kokkinos and Christos Bouras and Philippos Pouyioutas },
url = {https://telematics.upatras.gr/icufn_2025_cr/},
year = {2025},
date = {2025-07-08},
booktitle = {he 16th International Conference on Ubiquitous Networks (ICUFN 2025)},
address = {Lisbon, Portugal },
abstract = {This study investigates the prediction of Doppler shift variations in high-speed rail (HSR) environments using advanced deep learning and classical timeseries models. By simulating Doppler shifts at a 5G carrier frequency under noisy conditions, we evaluate and compare the performance of Bidirectional Long Short-Term Memory (LSTM) networks, Gated Recurrent Unit (GRU) networks, and an optimized Auto-Regressive Integrated Moving Average (ARIMA) model. The results highlight the strengths and limitations of each model, providing a detailed comparison between data-driven and statistical forecasting methods in dynamic 5G communication scenarios.},
note = {to appear},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
This study investigates the prediction of Doppler shift variations in high-speed rail (HSR) environments using advanced deep learning and classical timeseries models. By simulating Doppler shifts at a 5G carrier frequency under noisy conditions, we evaluate and compare the performance of Bidirectional Long Short-Term Memory (LSTM) networks, Gated Recurrent Unit (GRU) networks, and an optimized Auto-Regressive Integrated Moving Average (ARIMA) model. The results highlight the strengths and limitations of each model, providing a detailed comparison between data-driven and statistical forecasting methods in dynamic 5G communication scenarios.
Diasakos, Damianos; Prodromos, Nikolaos; Gkamas, Apostolos; Kokkinos, Vasileios; Bouras, Christos; Pouyioutas, Philippos
Distinguishing Signal from Noise in 5G MIMO Systems Using Generative Adversarial Networks Conference
2th International Conference on New Technologies, Mobility and Security, June 18 – 20, 2025, Paris, France, 2025, (To appear).
Abstract | Links | BibTeX | Tags:
@conference{,
title = {Distinguishing Signal from Noise in 5G MIMO Systems Using Generative Adversarial Networks},
author = {Damianos Diasakos and Nikolaos Prodromos and Apostolos Gkamas and Vasileios Kokkinos and Christos Bouras and Philippos Pouyioutas },
url = {https://telematics.upatras.gr/2025127023/},
year = {2025},
date = {2025-06-18},
urldate = {2025-06-18},
booktitle = {2th International Conference on New Technologies, Mobility and Security, June 18 – 20, 2025},
address = {Paris, France},
abstract = {In recent years, Generative Adversarial Networks (GANs) have emerged as powerful tools for improving signal processing in advanced communication systems, particularly in the context of 5G networks. In this paper, we present a novel approach for distinguishing signal from noise in 5G Multiple Input Multiple Output (MIMO) systems using GANs. Our method leverages the generative capabilities of GANs to
produce realistic noise signals and the discriminative power of GANs to accurately identify real signals amidst noise. By training the GAN on a combination of real-world noisy signals and pure noise, our model achieves robust signal detection and classification. We evaluate our approach using synthetic data, demonstrating significant improvements over other techniques such as the autoencoders. Our results highlight the potential of GANs in enhancing the reliability and performance of 5G MIMO communications.},
note = {To appear},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
In recent years, Generative Adversarial Networks (GANs) have emerged as powerful tools for improving signal processing in advanced communication systems, particularly in the context of 5G networks. In this paper, we present a novel approach for distinguishing signal from noise in 5G Multiple Input Multiple Output (MIMO) systems using GANs. Our method leverages the generative capabilities of GANs to
produce realistic noise signals and the discriminative power of GANs to accurately identify real signals amidst noise. By training the GAN on a combination of real-world noisy signals and pure noise, our model achieves robust signal detection and classification. We evaluate our approach using synthetic data, demonstrating significant improvements over other techniques such as the autoencoders. Our results highlight the potential of GANs in enhancing the reliability and performance of 5G MIMO communications.
produce realistic noise signals and the discriminative power of GANs to accurately identify real signals amidst noise. By training the GAN on a combination of real-world noisy signals and pure noise, our model achieves robust signal detection and classification. We evaluate our approach using synthetic data, demonstrating significant improvements over other techniques such as the autoencoders. Our results highlight the potential of GANs in enhancing the reliability and performance of 5G MIMO communications.
Diasakos, Damianos; Prodromos, Nikolaos; Gkamas, Apostolos; Kokkinos, Vasileios; Bouras, Christos; Pouyioutas, Philippos
A Reinforcement Learning Approach On Self – Optimizing Heterogeneous Networks Conference
9th IEEE Symposium on Computers and Communications (ISCC 2025), July 2 – 5, 2025, Bologna, Italy, 2025, (to appear).
Abstract | Links | BibTeX | Tags:
@conference{nokey,
title = {A Reinforcement Learning Approach On Self – Optimizing Heterogeneous Networks},
author = {Damianos Diasakos and Nikolaos Prodromos and Apostolos Gkamas and Vasileios Kokkinos and Christos Bouras and Philippos Pouyioutas },
url = {https://telematics.upatras.gr/2025125721/},
year = {2025},
date = {2025-06-02},
urldate = {2025-06-02},
booktitle = {9th IEEE Symposium on Computers and Communications (ISCC 2025), July 2 – 5, 2025},
address = {Bologna, Italy},
abstract = {This paper presents a reinforcement learningbased approach for optimizing the performance of 5G mobile networks. By leveraging Deep Q-Networks (DQN), our system autonomously tunes network parameters across macro, micro, and pico cells, adapting to the dynamic distribution in a heterogeneous network environment. The agent is tasked with optimizing several Key Performance Indicators (KPIs) such as throughput, latency, interference, and Quality of Service (QoS). Each cell in the network can perform actions such as adjusting power levels, changing handover thresholds, allocating bandwidth, and performing interference mitigation. Our approach demonstrates significant improvements in user experience, resource utilization, and network efficiency over traditional static optimization methods. The results show that the proposed reinforcement learning -based algorithm not only reduces latency and interference but also ensures better load balancing and throughput optimization across heterogeneous cells.
},
note = {to appear},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
This paper presents a reinforcement learningbased approach for optimizing the performance of 5G mobile networks. By leveraging Deep Q-Networks (DQN), our system autonomously tunes network parameters across macro, micro, and pico cells, adapting to the dynamic distribution in a heterogeneous network environment. The agent is tasked with optimizing several Key Performance Indicators (KPIs) such as throughput, latency, interference, and Quality of Service (QoS). Each cell in the network can perform actions such as adjusting power levels, changing handover thresholds, allocating bandwidth, and performing interference mitigation. Our approach demonstrates significant improvements in user experience, resource utilization, and network efficiency over traditional static optimization methods. The results show that the proposed reinforcement learning -based algorithm not only reduces latency and interference but also ensures better load balancing and throughput optimization across heterogeneous cells.