Christos Bouras
Short CV: Christos Bouras is Professor in the University of Patras, Department of Computer Engineering and Informatics. Also he is a scientific advisor of Research Unit 6 in Computer Technology Institute and Press – Diophantus, Patras, Greece. His research interests include Analysis of Performance of Networking and Computer Systems, Computer Networks and Protocols, Mobile and Wireless Communications, Telematics and New Services, QoS and Pricing for Networks and Services, e-learning, Networked Virtual Environments and WWW Issues. He has extended professional experience in Design and Analysis of Networks, Protocols, Telematics and New Services. He has published more than 450 papers in various well-known refereed books, conferences and journals. He is a co-author of 9 books in Greek and editor of 2 in English. He has been member of editorial board for international journals and PC member and referee in various international journals and conferences. He has participated in R&D projects.
Book Chapters
Bouras, Christos; Kollia, Anastasia; Papazois, Andreas
Exploring SDN & NFV in 5G Using ONOS & POX Conytollers Book Chapter
In: Research Anthology on Developing and Optimizing 5G Networks and the Impact on Society, IGI Global 2021, Chapter 9, pp. 187-203, 2021.
Abstract | Links | BibTeX | Tags:
@inbook{4513,
title = {Exploring SDN & NFV in 5G Using ONOS & POX Conytollers},
author = {Christos Bouras and Anastasia Kollia and Andreas Papazois},
url = {https://telematics.upatras.gr/wp-content/uploads/2024/01/Exploring-SDN-NFV-in-5G-Using-ONOS-POX-Controllers.pdf},
year = {2021},
date = {2021-01-01},
urldate = {2021-01-01},
booktitle = {Research Anthology on Developing and Optimizing 5G Networks and the Impact on Society, IGI Global 2021},
pages = {187-203},
chapter = {9},
abstract = {This article describes how novel functionalities will take advantage of the cloud networking and will gradually replace the existing infrastructure of mobile networks with a virtualized one. Two technologies, namely software defined networking (SDN) and network function virtualization (NFV), offer their important benefits and a combination of them is an answer to the demands raised, such as central office re-architected as a data center (CORD). Open network operating system (ONOS) and POX are SDN controllers and offer an option to combine SDN and NFV addressing many ongoing problems in the field of mobile networks. In this paper, technologies and both controllers are compared and contrasted. Indicative cases of topologies are simulated and help evaluating both controllers. According to the experimental findings, ONOS is one of the most important controllers for practical, theoretical, research and educational purposes, while POX is a useful and simpler controller for other educative applications.},
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This article describes how novel functionalities will take advantage of the cloud networking and will gradually replace the existing infrastructure of mobile networks with a virtualized one. Two technologies, namely software defined networking (SDN) and network function virtualization (NFV), offer their important benefits and a combination of them is an answer to the demands raised, such as central office re-architected as a data center (CORD). Open network operating system (ONOS) and POX are SDN controllers and offer an option to combine SDN and NFV addressing many ongoing problems in the field of mobile networks. In this paper, technologies and both controllers are compared and contrasted. Indicative cases of topologies are simulated and help evaluating both controllers. According to the experimental findings, ONOS is one of the most important controllers for practical, theoretical, research and educational purposes, while POX is a useful and simpler controller for other educative applications.
Bouras, Christos; Kapoulas, Vaggelis; Tsanai, Enea
Performance Evaluation of Routing Mechanisms for VANETs in Urban Areas Book Chapter
In: Algorithms, Probability, Networks, and Games: Scientific Papers and Essays, pp. 133-135, 2015.
Abstract | Links | BibTeX | Tags:
@inbook{4105,
title = {Performance Evaluation of Routing Mechanisms for VANETs in Urban Areas},
author = {Christos Bouras and Vaggelis Kapoulas and Enea Tsanai},
url = {https://telematics.upatras.gr/wp-content/uploads/2024/01/Spirakis-Festschrift-3A978-3-319-24024-4-bouras.pdf},
year = {2015},
date = {2015-01-01},
urldate = {2015-01-01},
booktitle = {Algorithms, Probability, Networks, and Games: Scientific Papers and Essays},
pages = {133-135},
abstract = {Mobile Ad hoc Networks (MANETs) and especially Vehicular Ad hoc Networks (VANETs) have recently gained large interest and their performance is heavily studied. A great challenge in VANETs, especially in an urban setting, is the routing scheme used and the subsequent performance obtained. This work presents an experimental performance evaluation of routing mechanisms in VANETs, using simulation, within an urban Manhattan grid like environment. It also describes and evaluates an enhancement of the Greedy Perimeter Stateless Routing (GPSR) protocol that takes into account the motion of the vehicles and the nature of the urban environment. The simulation results demonstrate that the proposed enhancement to the GPSR protocol manages to significantly increase the delivery ratio without increasing the power consumption; nevertheless, in some cases the improvement on delivery ratio is achieved at the expense of slightly increased end-to-end delay.},
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Mobile Ad hoc Networks (MANETs) and especially Vehicular Ad hoc Networks (VANETs) have recently gained large interest and their performance is heavily studied. A great challenge in VANETs, especially in an urban setting, is the routing scheme used and the subsequent performance obtained. This work presents an experimental performance evaluation of routing mechanisms in VANETs, using simulation, within an urban Manhattan grid like environment. It also describes and evaluates an enhancement of the Greedy Perimeter Stateless Routing (GPSR) protocol that takes into account the motion of the vehicles and the nature of the urban environment. The simulation results demonstrate that the proposed enhancement to the GPSR protocol manages to significantly increase the delivery ratio without increasing the power consumption; nevertheless, in some cases the improvement on delivery ratio is achieved at the expense of slightly increased end-to-end delay.
Bouras, Christos; Charalambides, Savvas; Drakoulelis, Michalis; Kioumourtzis, G; Stamos, Kostas
Enhancing simulation environment with TRAFIL Book Chapter
In: Simulation Technologies in Networking and Communications: Selecting the Best Tool for the Test, Chapter 14, pp. 391-415, CRC Press, 2014.
Abstract | Links | BibTeX | Tags:
@inbook{3435,
title = {Enhancing simulation environment with TRAFIL},
author = {Christos Bouras and Savvas Charalambides and Michalis Drakoulelis and G Kioumourtzis and Kostas Stamos},
url = {https://telematics.upatras.gr/wp-content/uploads/2024/01/48386_RevisedManuscript.pdf},
year = {2014},
date = {2014-01-01},
urldate = {2014-01-01},
booktitle = {Simulation Technologies in Networking and Communications: Selecting the Best Tool for the Test},
pages = {391-415},
publisher = {CRC Press},
chapter = {14},
organization = {CRC Press},
abstract = {<p>This chapter presents TRAFIL, a comprehensive tool for enhancing execution of simulations. It provides an overview of the tool, its architecture and its functionalities. It explains how TRAFIL en-hances the entire simulation procedure including graphical setup of simulation scenarios, automated execution of simulations, flexible handling and storage of simulation trace files and presentation of plots based on processing of simulation results. It presents the concept of metafiles that provides TRAFIL with the flexibility to handle heterogeneous simulation environments. The chapter also compares TRAFIL performance with other similar tools and finds that it offers significantly im-proved performance. It therefore concludes that TRAFIL offers both a rich set of simulation en-hancement functionalities and top performance.</p>},
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<p>This chapter presents TRAFIL, a comprehensive tool for enhancing execution of simulations. It provides an overview of the tool, its architecture and its functionalities. It explains how TRAFIL en-hances the entire simulation procedure including graphical setup of simulation scenarios, automated execution of simulations, flexible handling and storage of simulation trace files and presentation of plots based on processing of simulation results. It presents the concept of metafiles that provides TRAFIL with the flexibility to handle heterogeneous simulation environments. The chapter also compares TRAFIL performance with other similar tools and finds that it offers significantly im-proved performance. It therefore concludes that TRAFIL offers both a rich set of simulation en-hancement functionalities and top performance.</p>
Bouras, Christos; Kokkinos, Vasileios; Diles, Georgios; Topaloglou, Lefteris; Bouras, Christos; Kos, Andrej; Frank, Andrew
IMPACT OF BROADBAND ON ECONOMY Book Chapter
In: Policies and Tools for Efficient Design of Broadband Development, Chapter 2, pp. 28-42, 2014.
Abstract | Links | BibTeX | Tags:
@inbook{4067,
title = {IMPACT OF BROADBAND ON ECONOMY},
author = {Christos Bouras and Vasileios Kokkinos and Georgios Diles and Lefteris Topaloglou and Christos Bouras and Andrej Kos and Andrew Frank},
url = {https://telematics.upatras.gr/wp-content/uploads/2024/01/SIVA-paper-Chapter-2.pdf},
year = {2014},
date = {2014-01-01},
urldate = {2014-01-01},
booktitle = {Policies and Tools for Efficient Design of Broadband Development},
pages = {28-42},
chapter = {2},
abstract = {<p>In this chapter, we investigate the impact of broadband on the growth and employment in SEE countries, namely Austria, Bulgaria, the former Yugoslav Republic of Macedonia (FYROM), Greece, Montenegro, Slovenia. Specifically, we define the macroeconomic evidence required for the analysis. We then enforce regression analysis on data collected by the respective countries in order to find the correlation between broadband, growth and employment. The period of the examination was set to be the last decade in order to obtain an extended amount of data, and take into account possible influences on the results by the economic crisis and the subsequent recession of the last years in the area. We also estimate the cost savings to companies and the state by the usage of broadband-based e-government services. We then forecast these benefits to 2015 when the respective countries are expected to have reached the e-government usage level which is set by the European digital agenda (Digital agenda, 2013).</p>},
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<p>In this chapter, we investigate the impact of broadband on the growth and employment in SEE countries, namely Austria, Bulgaria, the former Yugoslav Republic of Macedonia (FYROM), Greece, Montenegro, Slovenia. Specifically, we define the macroeconomic evidence required for the analysis. We then enforce regression analysis on data collected by the respective countries in order to find the correlation between broadband, growth and employment. The period of the examination was set to be the last decade in order to obtain an extended amount of data, and take into account possible influences on the results by the economic crisis and the subsequent recession of the last years in the area. We also estimate the cost savings to companies and the state by the usage of broadband-based e-government services. We then forecast these benefits to 2015 when the respective countries are expected to have reached the e-government usage level which is set by the European digital agenda (Digital agenda, 2013).</p>
Bouras, Christos; Alexiou, Antonios; Papazois, Andreas; Kokkinos, Vasileios; Tsichritzis, George
Multimedia Broadcasting in LTE Networks Book Chapter
In: Access Environments and Quality of Service Provisioning: Solutions and Applications, Chapter 11, pp. 269-289, IGI Global, 2012.
Abstract | Links | BibTeX | Tags: LTE, MBMS
@inbook{3145,
title = {Multimedia Broadcasting in LTE Networks},
author = {Christos Bouras and Antonios Alexiou and Andreas Papazois and Vasileios Kokkinos and George Tsichritzis},
url = {https://telematics.upatras.gr/wp-content/uploads/2024/01/Multimedia-Broadcasting-in-LTE-Networks.pdf},
year = {2012},
date = {2012-01-01},
urldate = {2012-01-01},
booktitle = {Access Environments and Quality of Service Provisioning: Solutions and Applications},
pages = {269-289},
publisher = {IGI Global},
chapter = {11},
organization = {IGI Global},
abstract = {Long Term Evolution (LTE) constitutes the latest step before the 4th generation (4G) of radio technologies designed to increase the capacity and speed of mobile communications. To support Multimedia Broadcast/Multicast Services (MBMS), LTE offers the functionality to transmit MBMS over Single Frequency Network (MBSFN), where a time-synchronized common waveform is transmitted from multiple cells for a given duration. In MBSFN transmissions, the achieved Spectral Efficiency (SE) is mainly determined by the Modulation and Coding Scheme (MCS) selected. This study proposes and evaluates four approaches for the selection of the MCS that will be utilized for the transmission of the MBSFN data. The evaluation of the approaches is performed for different users? distribution and from SE perspective. Based on the SE measurement, we determine the approach that either maximizes or achieves a target SE for the corresponding users? distribution.},
keywords = {LTE, MBMS},
pubstate = {published},
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Long Term Evolution (LTE) constitutes the latest step before the 4th generation (4G) of radio technologies designed to increase the capacity and speed of mobile communications. To support Multimedia Broadcast/Multicast Services (MBMS), LTE offers the functionality to transmit MBMS over Single Frequency Network (MBSFN), where a time-synchronized common waveform is transmitted from multiple cells for a given duration. In MBSFN transmissions, the achieved Spectral Efficiency (SE) is mainly determined by the Modulation and Coding Scheme (MCS) selected. This study proposes and evaluates four approaches for the selection of the MCS that will be utilized for the transmission of the MBSFN data. The evaluation of the approaches is performed for different users? distribution and from SE perspective. Based on the SE measurement, we determine the approach that either maximizes or achieves a target SE for the corresponding users? distribution.
Bouras, Christos; Kapoulas, Vaggelis; Ganos, Petros
Broadband Infrastructures as a Common and the Role of Local Governments Book Chapter
In: Public Sector Reform Using Information Technologies : Trandforming Policy into Practice, pp. 298-319, IGI Global, 2011.
@inbook{3141,
title = {Broadband Infrastructures as a Common and the Role of Local Governments},
author = {Christos Bouras and Vaggelis Kapoulas and Petros Ganos},
url = {https://telematics.upatras.gr/wp-content/uploads/2024/01/Broadband-Infrastructures-as-a-Common-and-the-Role-of-Local-Governments.pdf},
year = {2011},
date = {2011-01-01},
urldate = {2011-01-01},
booktitle = {Public Sector Reform Using Information Technologies : Trandforming Policy into Practice},
pages = {298-319},
publisher = {IGI Global},
organization = {IGI Global},
keywords = {},
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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}
}
Bouras, Christos; Poulopoulos, Vassilis; Silintziris, Panagiotis
Learning from user’s behavior - A technique for personalized news search supporting result cashing Book Chapter
In: Information Extraction from the Internet, Chapter 11, pp. 177-196, iConcept Press, 2011.
@inbook{3146,
title = {Learning from user’s behavior - A technique for personalized news search supporting result cashing},
author = {Christos Bouras and Vassilis Poulopoulos and Panagiotis Silintziris},
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year = {2011},
date = {2011-01-01},
urldate = {2011-01-01},
booktitle = {Information Extraction from the Internet},
pages = {177-196},
publisher = {iConcept Press},
chapter = {11},
organization = {iConcept Press},
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pubstate = {published},
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Bouras, Christos; Stamos, Kostas
Security issues for multi - domain resource reservation Book Chapter
In: Network Security, Administration, and Management: Advancing Technologies and Practises, pp. 38 - 50, IGI Global, 2011.
Abstract | Links | BibTeX | Tags:
@inbook{3142,
title = {Security issues for multi - domain resource reservation},
author = {Christos Bouras and Kostas Stamos},
url = {https://telematics.upatras.gr/wp-content/uploads/2024/01/Security-Issues-for-Multi-Domain-Resource-Reservation.pdf},
year = {2011},
date = {2011-01-01},
urldate = {2011-01-01},
booktitle = {Network Security, Administration, and Management: Advancing Technologies and Practises},
pages = {38 - 50},
publisher = {IGI Global},
organization = {IGI Global},
abstract = {In this chapter, we deal with the issue of security regarding components that are responsible for provisioning multi-domain network services, either automatically or through some form of administrator interaction. It is evident that a malicious compromise of such a component would have far-reaching implications for the stability of the network. Furthermore, trust between cooperating domains is a delicate issue and each partner in the multi-domain federation has to have some guarantees that peers in the service are not going to be security compromised. We enumerate some of the related dangers and propose ways to limit the attack surface, reduce the intrusion possibilities, and guarantee the quick resolution of any successful violations. The issue of security is studied in two main parts: Inter-domain security, for the communication between domains and the successful negotiation of resource reservations and intra-domain security, for the internal communications within a domain for the initiation of a resource reservation and its actual realization in the network devices. Resource reservation is studied both on the level of IP services based on Differentiated Services architectures, and on the level of dynamic circuit reservation based on Layer 2 technologies. The chapter is completed with a case study on the authentication and authorization framework designed in the context of a pan-european network resource reservation service, in the Geant academic and research network.</p>},
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In this chapter, we deal with the issue of security regarding components that are responsible for provisioning multi-domain network services, either automatically or through some form of administrator interaction. It is evident that a malicious compromise of such a component would have far-reaching implications for the stability of the network. Furthermore, trust between cooperating domains is a delicate issue and each partner in the multi-domain federation has to have some guarantees that peers in the service are not going to be security compromised. We enumerate some of the related dangers and propose ways to limit the attack surface, reduce the intrusion possibilities, and guarantee the quick resolution of any successful violations. The issue of security is studied in two main parts: Inter-domain security, for the communication between domains and the successful negotiation of resource reservations and intra-domain security, for the internal communications within a domain for the initiation of a resource reservation and its actual realization in the network devices. Resource reservation is studied both on the level of IP services based on Differentiated Services architectures, and on the level of dynamic circuit reservation based on Layer 2 technologies. The chapter is completed with a case study on the authentication and authorization framework designed in the context of a pan-european network resource reservation service, in the Geant academic and research network.</p>
Bouras, Christos; Stamos, Kostas; Papapanagiotou, Vassilis; Zaoudis, Giannis
The TFRC protocol and its usage for wireless video transmission Book Chapter
In: Advanced CommunicationProtocol Technologies: Solutions, Methods and Applications, Chapter 14, pp. 300 - 317, IGI Global, 2011.
Abstract | Links | BibTeX | Tags:
@inbook{3143,
title = {The TFRC protocol and its usage for wireless video transmission},
author = {Christos Bouras and Kostas Stamos and Vassilis Papapanagiotou and Giannis Zaoudis},
url = {https://telematics.upatras.gr/wp-content/uploads/2024/01/The-TFRC-Protocol-and-Its-Usage-for-Wireless-Video-Transmission.pdf},
year = {2011},
date = {2011-01-01},
urldate = {2011-01-01},
booktitle = {Advanced CommunicationProtocol Technologies: Solutions, Methods and Applications},
pages = {300 - 317},
publisher = {IGI Global},
chapter = {14},
organization = {IGI Global},
abstract = {<p>The subject of this chapter is to present the TFRC (TCP-Friendly Rate Control) protocol in the area of efficient wireless video transmission and its possible usage in cross-layer power management mechanisms. The basic aspects of TFRC operation are presented, along with the suitability of TFRC usage for video transmission. The chapter examines related work and presents several mechanisms for efficient wireless video transmission using TFRC that have been proposed. These mechanisms utilize cross-layer approaches for adaptation of the power transmission level of the sender and TFRC feedback information regarding the wireless connection status from the receiver for improved transmission statistics, and therefore user experience, without unnecessary power consumption.</p>},
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<p>The subject of this chapter is to present the TFRC (TCP-Friendly Rate Control) protocol in the area of efficient wireless video transmission and its possible usage in cross-layer power management mechanisms. The basic aspects of TFRC operation are presented, along with the suitability of TFRC usage for video transmission. The chapter examines related work and presents several mechanisms for efficient wireless video transmission using TFRC that have been proposed. These mechanisms utilize cross-layer approaches for adaptation of the power transmission level of the sender and TFRC feedback information regarding the wireless connection status from the receiver for improved transmission statistics, and therefore user experience, without unnecessary power consumption.</p>
Bouras, Christos; Gkamas, Apostolos
Adaptive multimedia transmission over the Internet Book Chapter
In: Chapter 20, Selected Topics in Communication Networks and Distributed Systems, pp. 589 - 606, World Scientific, 2010.
Abstract | Links | BibTeX | Tags:
@inbook{3130,
title = {Adaptive multimedia transmission over the Internet},
author = {Christos Bouras and Apostolos Gkamas},
url = {https://telematics.upatras.gr/wp-content/uploads/2024/01/4416adaptive.pdf},
year = {2010},
date = {2010-01-01},
urldate = {2010-01-01},
booktitle = {Chapter 20, Selected Topics in Communication Networks and Distributed Systems},
pages = {589 - 606},
publisher = {World Scientific},
organization = {World Scientific},
abstract = {The Internet is a heterogeneous network environment and the network resources that are available to multimedia applications can be modified very quickly. Multimedia applications must have the capability to adapt their operation to network changes. In order to add adaptation characteristics to multimedia applications, we can use techniques both at the network and application layers. Adaptive multimedia transmission techniques have the capability to transmit multimedia data over heterogeneous networks and adapt media transmission to network changes. In order to provide adaptive multimedia transmission, mechanisms to monitor the network conditions and mechanisms to adapt the transmission of the data to the network changes must be implemented. This chapter concentrates on the architecture and design issues of adaptive multimedia techniques that provide the capability to transmit multimedia data over heterogeneous networks and adapt the transmission of the multimedia data to the network changes.},
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The Internet is a heterogeneous network environment and the network resources that are available to multimedia applications can be modified very quickly. Multimedia applications must have the capability to adapt their operation to network changes. In order to add adaptation characteristics to multimedia applications, we can use techniques both at the network and application layers. Adaptive multimedia transmission techniques have the capability to transmit multimedia data over heterogeneous networks and adapt media transmission to network changes. In order to provide adaptive multimedia transmission, mechanisms to monitor the network conditions and mechanisms to adapt the transmission of the data to the network changes must be implemented. This chapter concentrates on the architecture and design issues of adaptive multimedia techniques that provide the capability to transmit multimedia data over heterogeneous networks and adapt the transmission of the multimedia data to the network changes.
Bouras, Christos; Gkamas, Apostolos; Tsiatsos, Thrasivoulos
Best Practices and Strategies for Broadband Deployment: Lessons learned around the world Book Chapter
In: C. Bouras, A. Gkamas, T. Tsiatsos, Adoption, Usage, andGlobal Impact of Broadband Technologies: Diffusion, Practice and Policy, Chapter 8, pp. 128 - 142, IGI Global, 2010.
Abstract | Links | BibTeX | Tags:
@inbook{3140,
title = {Best Practices and Strategies for Broadband Deployment: Lessons learned around the world},
author = {Christos Bouras and Apostolos Gkamas and Thrasivoulos Tsiatsos},
url = {https://telematics.upatras.gr/wp-content/uploads/2024/01/29845078Chapter-8.pdf},
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date = {2010-01-01},
urldate = {2010-01-01},
booktitle = {C. Bouras, A. Gkamas, T. Tsiatsos, Adoption, Usage, andGlobal Impact of Broadband Technologies: Diffusion, Practice and Policy},
pages = {128 - 142},
publisher = {IGI Global},
chapter = {8},
organization = {IGI Global},
abstract = {<p>Broadband deployment is a necessity nowadays. It could help each country, municipality and region to grow and offer better quality of life to the citizens. Today, the emphasis on the development of broadband networks is on fixed Fibre To The Home solutions The lessons learned from countries that are leaders in broadband penetration and Fibre To The Home deployment could be proven very useful for under-served communities, regions and countries where the broadband penetration is low. Therefore, this chapter summarises the lessons learned from implementing (a) country-wide strategies formulated at the national level, and (b) local strategies formulated by the municipalities. Concerning the role of national and local governments, it should be noted that nowadays it is very urgent the involvement of government in the development of broadband infrastructure. Proposed noteworthy remarkable cases are Japan, South Korea and Singapore.</p>},
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<p>Broadband deployment is a necessity nowadays. It could help each country, municipality and region to grow and offer better quality of life to the citizens. Today, the emphasis on the development of broadband networks is on fixed Fibre To The Home solutions The lessons learned from countries that are leaders in broadband penetration and Fibre To The Home deployment could be proven very useful for under-served communities, regions and countries where the broadband penetration is low. Therefore, this chapter summarises the lessons learned from implementing (a) country-wide strategies formulated at the national level, and (b) local strategies formulated by the municipalities. Concerning the role of national and local governments, it should be noted that nowadays it is very urgent the involvement of government in the development of broadband infrastructure. Proposed noteworthy remarkable cases are Japan, South Korea and Singapore.</p>
Bouras, Christos; Gkamas, Apostolos; Kioumourtzis, G
Cross Layer Design for Multimedia Transmission over Wireless Networks Book Chapter
In: Next Generation Mobile Networks and Ubiquitous Computing, Chapter 4, pp. 35 - 42, Information Science Reference, 2010.
Abstract | Links | BibTeX | Tags:
@inbook{3133,
title = {Cross Layer Design for Multimedia Transmission over Wireless Networks},
author = {Christos Bouras and Apostolos Gkamas and G Kioumourtzis},
url = {https://telematics.upatras.gr/wp-content/uploads/2024/01/21084.pdf},
year = {2010},
date = {2010-01-01},
urldate = {2010-01-01},
booktitle = {Next Generation Mobile Networks and Ubiquitous Computing},
pages = {35 - 42},
publisher = {Information Science Reference},
chapter = {4},
organization = {Information Science Reference},
abstract = {<p>Over the last years a number of new protocols have been developed for multimedia applications in the whole OSI layer?s scale. In addition wireless communications and networking fast occupy centre stage in research and development activity in the area of communication networks. In order to support better wireless user the cross layer design paradigm has been proposed. This chapter presents the challenges in design and implementation of cross layer adaptation schemes for multimedia transmission over wireless networks. In addition this chapter presents the most important parameters and constrains that should be taken into consideration when attempting cross layer adaptation in wireless networks that involves different protocols in the overall protocol stack.</p>},
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<p>Over the last years a number of new protocols have been developed for multimedia applications in the whole OSI layer?s scale. In addition wireless communications and networking fast occupy centre stage in research and development activity in the area of communication networks. In order to support better wireless user the cross layer design paradigm has been proposed. This chapter presents the challenges in design and implementation of cross layer adaptation schemes for multimedia transmission over wireless networks. In addition this chapter presents the most important parameters and constrains that should be taken into consideration when attempting cross layer adaptation in wireless networks that involves different protocols in the overall protocol stack.</p>
Bouras, Christos; Alexiou, Antonios; Kokkinos, Vasileios
Efficient Power Allocation in E-MBMS Enabled 4G Networks Book Chapter
In: Wireless Network Traffic and Quality of Service Support: Trends and Standards, Chapter 18, pp. 458 - 488, IGI Global, 2010.
Abstract | Links | BibTeX | Tags: LTE, MBMS, Power Control
@inbook{3138,
title = {Efficient Power Allocation in E-MBMS Enabled 4G Networks},
author = {Christos Bouras and Antonios Alexiou and Vasileios Kokkinos},
url = {https://telematics.upatras.gr/wp-content/uploads/2024/01/Chap18.pdf},
year = {2010},
date = {2010-01-01},
urldate = {2010-01-01},
booktitle = {Wireless Network Traffic and Quality of Service Support: Trends and Standards},
pages = {458 - 488},
publisher = {IGI Global},
chapter = {18},
organization = {IGI Global},
abstract = {<p>The plethora of mobile multimedia services that are expected to face high penetration, poses the need for the deployment of a resource economic scheme in Long Term Evolution (LTE) networks. To this direction, the Evolved - Multimedia Broadcast / Multicast Service (E- MBMS) is envisaged to play an instrumental role for LTE proliferation and set the basis for a successful 4th Generation (4G) standardization process. One of the most critical aspects of E- MBMS performance is the selection of the most efficient radio bearer, in terms of power consumption. This chapter presents the prevailing radio bearer selection mechanisms and examines their performance in terms of power consumption. Furthermore, it discusses problems regarding the high power requirements for the realization of E-MBMS and evaluates the proposed techniques/solutions. Finally, this chapter presents a novel mechanism for efficient power control during E-MBMS transmissions that conforms to LTE requirements for simultaneous provision of multiple multimedia sessions.</p>},
keywords = {LTE, MBMS, Power Control},
pubstate = {published},
tppubtype = {inbook}
}
<p>The plethora of mobile multimedia services that are expected to face high penetration, poses the need for the deployment of a resource economic scheme in Long Term Evolution (LTE) networks. To this direction, the Evolved - Multimedia Broadcast / Multicast Service (E- MBMS) is envisaged to play an instrumental role for LTE proliferation and set the basis for a successful 4th Generation (4G) standardization process. One of the most critical aspects of E- MBMS performance is the selection of the most efficient radio bearer, in terms of power consumption. This chapter presents the prevailing radio bearer selection mechanisms and examines their performance in terms of power consumption. Furthermore, it discusses problems regarding the high power requirements for the realization of E-MBMS and evaluates the proposed techniques/solutions. Finally, this chapter presents a novel mechanism for efficient power control during E-MBMS transmissions that conforms to LTE requirements for simultaneous provision of multiple multimedia sessions.</p>
Bouras, Christos; Tsiatsos, Thrasivoulos; Giannaka, Eleftheria
Exploiting Virtual Environments and Web2.0 Immersive Worlds to Support Collaborative e-Learning Communities Book Chapter
In: Novel Approaches in Web - Based Learning Technologies: Tools for ModernTeaching, Chapter 2, pp. 20 - 45, IGI Global, 2010.
Abstract | Links | BibTeX | Tags:
@inbook{3134,
title = {Exploiting Virtual Environments and Web2.0 Immersive Worlds to Support Collaborative e-Learning Communities},
author = {Christos Bouras and Thrasivoulos Tsiatsos and Eleftheria Giannaka},
url = {https://telematics.upatras.gr/wp-content/uploads/2024/01/ADVANCED-ISSUES-IN-THE-DESIGN-OF-A-PLATFORM-FOR-EDUCATIONAL-VIRTUAL-ENVIRONMENTS.pdf},
year = {2010},
date = {2010-01-01},
urldate = {2010-01-01},
booktitle = {Novel Approaches in Web - Based Learning Technologies: Tools for ModernTeaching},
pages = {20 - 45},
publisher = {IGI Global},
chapter = {2},
organization = {IGI Global},
abstract = {<p>The main goal of this chapter is to facilitate educational designers and developers by providing a point of reference for making decisions on how to incorporate 3D environments into the applications they develop as well as for extending their capabilities by integrating more functionality. Therefore, this chapter presents the design principles for virtual spaces, which aim at supporting multi-user communication in web-based learning communities. In addition the implementation of these principles is presented using as point of reference EVE Training Area. This environment constitutes a three-dimensional space where participants, represented by 3D humanoid avatars, have the ability to use a variety of 3D e-collaboration tools for learning together. Furthermore, this chapter presents how these principles could be used as criteria for validating and extending ready Web2.0 Immersive worlds for supporting collaborative e-learning. Finally, collaborative e-learning usage scenarios that could be realized by exploiting collaborative virtual environments are described.</p>},
keywords = {},
pubstate = {published},
tppubtype = {inbook}
}
<p>The main goal of this chapter is to facilitate educational designers and developers by providing a point of reference for making decisions on how to incorporate 3D environments into the applications they develop as well as for extending their capabilities by integrating more functionality. Therefore, this chapter presents the design principles for virtual spaces, which aim at supporting multi-user communication in web-based learning communities. In addition the implementation of these principles is presented using as point of reference EVE Training Area. This environment constitutes a three-dimensional space where participants, represented by 3D humanoid avatars, have the ability to use a variety of 3D e-collaboration tools for learning together. Furthermore, this chapter presents how these principles could be used as criteria for validating and extending ready Web2.0 Immersive worlds for supporting collaborative e-learning. Finally, collaborative e-learning usage scenarios that could be realized by exploiting collaborative virtual environments are described.</p>
Bouras, Christos; Kapoulas, Vaggelis; Stamos, Kostas; Primpas, Dimitris; Poulopoulos, Leonidas; Papapanagiotou, Vassilis
Layer 2 Quality of Service Architecture Book Chapter
In: Trends in Telecommunications Technologies, Chapter 19, pp. 399 - 412, InTech, 2010.
@inbook{3136,
title = {Layer 2 Quality of Service Architecture},
author = {Christos Bouras and Vaggelis Kapoulas and Kostas Stamos and Dimitris Primpas and Leonidas Poulopoulos and Vassilis Papapanagiotou},
url = {https://telematics.upatras.gr/wp-content/uploads/2024/01/63732nd_Proof1.pdf},
year = {2010},
date = {2010-01-01},
urldate = {2010-01-01},
booktitle = {Trends in Telecommunications Technologies},
pages = {399 - 412},
publisher = {InTech},
chapter = {19},
organization = {InTech},
keywords = {},
pubstate = {published},
tppubtype = {inbook}
}
Bouras, Christos; Stamos, Kostas
Providing quality end-to-end videoconference services in IP networks Book Chapter
In: Videoconferencing: Technology, Impact and Applications, Chapter 5, pp. 111 - 122, Nova Science Publishers, 2010.
Abstract | Links | BibTeX | Tags:
@inbook{3137,
title = {Providing quality end-to-end videoconference services in IP networks},
author = {Christos Bouras and Kostas Stamos},
url = {https://telematics.upatras.gr/wp-content/uploads/2024/01/2414VTIA_NovaScience2009_Bouras.pdf},
year = {2010},
date = {2010-01-01},
urldate = {2010-01-01},
booktitle = {Videoconferencing: Technology, Impact and Applications},
pages = {111 - 122},
publisher = {Nova Science Publishers},
chapter = {5},
organization = {Nova Science Publishers},
abstract = {<p>The development of quality and user satisfying videoconference applications at a low cost has been hindered in the past by, among other reasons, low quality connections and a difficulty for the average user to establish end-to-end connections without hassle. In this chapter, we describe some of the latest methods and developments that overcome these problems. In particular, we discuss ways to make establishment of universal videoconference connections easier by overcoming the problem of participants that reside behind NAT routers, by deploying new protocols at the application or even the network layer. An example of the former case is the development of establishment protocols specifically designed for this purpose, while an example for the latter case is the deployment of IPv6, which aims to make NAT deployments obsolete. Furthermore, we discuss efforts to provide targeted support for quality of experience in networks that support some kind of traffic classification through the usage of dynamic mechanisms and dynamic network re-configurations. Apart from describing the state of the art in the aforementioned areas, we provide detailed insight in specific research efforts that have taken place and assess their results in the overall user experience.</p>},
keywords = {},
pubstate = {published},
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}
<p>The development of quality and user satisfying videoconference applications at a low cost has been hindered in the past by, among other reasons, low quality connections and a difficulty for the average user to establish end-to-end connections without hassle. In this chapter, we describe some of the latest methods and developments that overcome these problems. In particular, we discuss ways to make establishment of universal videoconference connections easier by overcoming the problem of participants that reside behind NAT routers, by deploying new protocols at the application or even the network layer. An example of the former case is the development of establishment protocols specifically designed for this purpose, while an example for the latter case is the deployment of IPv6, which aims to make NAT deployments obsolete. Furthermore, we discuss efforts to provide targeted support for quality of experience in networks that support some kind of traffic classification through the usage of dynamic mechanisms and dynamic network re-configurations. Apart from describing the state of the art in the aforementioned areas, we provide detailed insight in specific research efforts that have taken place and assess their results in the overall user experience.</p>
Bouras, Christos; Gkamas, Apostolos; Stamos, Kostas
Providing Quality of Service across multiple providers: The case of European research and academic space Book Chapter
In: Intelligent Quality of Service Technologies and Network Management: Models for Enhancing Communication, pp. 280 - 296, IGI Global, 2010.
Abstract | Links | BibTeX | Tags:
@inbook{3135,
title = {Providing Quality of Service across multiple providers: The case of European research and academic space},
author = {Christos Bouras and Apostolos Gkamas and Kostas Stamos},
url = {https://telematics.upatras.gr/wp-content/uploads/2024/01/5582978-1-61520-791-6_ch015.pdf},
year = {2010},
date = {2010-01-01},
urldate = {2010-01-01},
booktitle = {Intelligent Quality of Service Technologies and Network Management: Models for Enhancing Communication},
pages = {280 - 296},
publisher = {IGI Global},
organization = {IGI Global},
abstract = {<p>In this chapter, the authors present some of the latest developments related to the provisioning of Quality of Service (QoS) in today?s networks and the associated network management structures that are or will be deployed to support them. They first give a brief overview of the most important Quality of Service proposals in the areas of Layer 2 (L2) and Layer 3 (L3) QoS provisioning in backbone networks, and they discuss the network management structures and brokers that have been proposed in order to implement these services. As a case study, they describe the pan-european research and academic network, which is supported centrally by GEANT and which encompasses multiple independent NRENs (National Research and Education Networks). In the last few years, GEANT has developed and deployed a number of production and pilot services meant for the delivery of quality network services to the end users across Europe.</p>},
keywords = {},
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}
<p>In this chapter, the authors present some of the latest developments related to the provisioning of Quality of Service (QoS) in today?s networks and the associated network management structures that are or will be deployed to support them. They first give a brief overview of the most important Quality of Service proposals in the areas of Layer 2 (L2) and Layer 3 (L3) QoS provisioning in backbone networks, and they discuss the network management structures and brokers that have been proposed in order to implement these services. As a case study, they describe the pan-european research and academic network, which is supported centrally by GEANT and which encompasses multiple independent NRENs (National Research and Education Networks). In the last few years, GEANT has developed and deployed a number of production and pilot services meant for the delivery of quality network services to the end users across Europe.</p>
Bouras, Christos; Alexiou, Antonios; Kokkinos, Vasileios
Radio Resource Management for E-MBMS Transmissions towards LTE Book Chapter
In: Evolved Cellular Network Planning and Optimization for UMTS and LTE, Chapter 9, pp. 331 - 360, Auerbach Publications, CRC Press, Taylor and Francis Group, 2010.
Abstract | Links | BibTeX | Tags: LTE, MBMS, Power Control
@inbook{3139,
title = {Radio Resource Management for E-MBMS Transmissions towards LTE},
author = {Christos Bouras and Antonios Alexiou and Vasileios Kokkinos},
url = {https://telematics.upatras.gr/wp-content/uploads/2024/01/1335K10322_C009.pdf},
year = {2010},
date = {2010-01-01},
urldate = {2010-01-01},
booktitle = {Evolved Cellular Network Planning and Optimization for UMTS and LTE},
pages = {331 - 360},
publisher = {Auerbach Publications, CRC Press, Taylor and Francis Group},
chapter = {9},
organization = {Auerbach Publications, CRC Press, Taylor and Francis Group},
abstract = {<p>Long Term Evolution (LTE) constitutes a key standard that paves the way for the future mobile broadband landscape envisioned by 4th Generation (4G) wireless networks. Actu- ally, LTE addresses the emerging trend for the mass provision of rich multimedia services, such as Mobile TV, in a more power and spectral e±cient way than its predecessors. To this direction, the Evolved - Multimedia Broadcast/Multicast Service (E-MBMS) frame- work is envisaged to play an instrumental role for the LTE proliferation in mobile. E-MBMS constitutes the evolutionary successor of MBMS, which was introduced in the Release 6 of Universal Mobile Telecommunication System (UMTS). MBMS is designed in order to deliver multimedia data from a single source entity to multiple destinations. However, downlink ca- pacity in such networks is limited by base station transmission power. As an aftermath, in MBMS e±cient power allocation techniques should be implemented so as to ensure the mass provision of multimedia applications to mobile users. This chapter presents several techniques and mechanisms used today for MBMS power optimization in next generation cellular networks.</p>},
keywords = {LTE, MBMS, Power Control},
pubstate = {published},
tppubtype = {inbook}
}
<p>Long Term Evolution (LTE) constitutes a key standard that paves the way for the future mobile broadband landscape envisioned by 4th Generation (4G) wireless networks. Actu- ally, LTE addresses the emerging trend for the mass provision of rich multimedia services, such as Mobile TV, in a more power and spectral e±cient way than its predecessors. To this direction, the Evolved - Multimedia Broadcast/Multicast Service (E-MBMS) frame- work is envisaged to play an instrumental role for the LTE proliferation in mobile. E-MBMS constitutes the evolutionary successor of MBMS, which was introduced in the Release 6 of Universal Mobile Telecommunication System (UMTS). MBMS is designed in order to deliver multimedia data from a single source entity to multiple destinations. However, downlink ca- pacity in such networks is limited by base station transmission power. As an aftermath, in MBMS e±cient power allocation techniques should be implemented so as to ensure the mass provision of multimedia applications to mobile users. This chapter presents several techniques and mechanisms used today for MBMS power optimization in next generation cellular networks.</p>
Bouras, Christos; Poulopoulos, Vassilis; Tsogkas, Vassilis
Squeak Etoys: Interactive and Collaborative Learning Environment Book Chapter
In: Handbook of Research on SocialInteraction Technologies and Collaboration Software: Concepts and Trends, Chapter 37, pp. 417 - 427, IGI Global, 2010.
Abstract | Links | BibTeX | Tags:
@inbook{3132,
title = {Squeak Etoys: Interactive and Collaborative Learning Environment},
author = {Christos Bouras and Vassilis Poulopoulos and Vassilis Tsogkas},
url = {https://telematics.upatras.gr/wp-content/uploads/2024/01/9805978-1-60566-368-5_ch037.pdf},
year = {2010},
date = {2010-01-01},
urldate = {2010-01-01},
booktitle = {Handbook of Research on SocialInteraction Technologies and Collaboration Software: Concepts and Trends},
pages = {417 - 427},
publisher = {IGI Global},
chapter = {37},
organization = {IGI Global},
abstract = {<p>Squeak Etoys is a free software program and media-rich authoring system with a user-friendly visual interface. The software is designed to help six to twelve year-old children learn through interaction and collaboration; it comes preinstalled on XO laptop computers distributed by the One Laptop Per Child Foundation. The goal of the One Laptop Per Child initiative is to create novel educational opportunities for the world?s children by providing each child with a book-size, light and portable computer for personal use at school and at home. This chapter elaborates on the educational dimensions of the XO laptop and the Etoys environment developed to empower teachers and students with the capacity for creative learning, exploration, interaction, and collaboration. The authors focus on how the hardware and software capabilities of XO laptops can be utilized to allow children to interact, work together on projects, and engage in computer simulations and games while learning mathematics, physics, chemistry, and geometry.</p>},
keywords = {},
pubstate = {published},
tppubtype = {inbook}
}
<p>Squeak Etoys is a free software program and media-rich authoring system with a user-friendly visual interface. The software is designed to help six to twelve year-old children learn through interaction and collaboration; it comes preinstalled on XO laptop computers distributed by the One Laptop Per Child Foundation. The goal of the One Laptop Per Child initiative is to create novel educational opportunities for the world?s children by providing each child with a book-size, light and portable computer for personal use at school and at home. This chapter elaborates on the educational dimensions of the XO laptop and the Etoys environment developed to empower teachers and students with the capacity for creative learning, exploration, interaction, and collaboration. The authors focus on how the hardware and software capabilities of XO laptops can be utilized to allow children to interact, work together on projects, and engage in computer simulations and games while learning mathematics, physics, chemistry, and geometry.</p>