Christos Bouras

@conference{3019,

title = {A Competitive AL-FEC Framework over Mobile Multicast Delivery},

author = {Christos Bouras and Nikos Kanakis},

url = {https://telematics.upatras.gr/wp-content/uploads/2024/01/3601053_1679.pdf},

year  = {2013},

date = {2013-07-01},

urldate = {2013-07-01},

booktitle = {The 9th International Wireless Communications and Mobile Conference (IWCMC 2013), Cagliari, Italy, pp. 305-310},

pages = {305-310},

abstract = {<p>Reliability control is a key concern on the evolution of real-time mobile multicast services. To this direction the use of forward error correction (FEC) on the application layer is widely adopted in several mobile multicast standards. FEC is a feedback free error control method where the transmitter introduces in advance redundant information to enable receivers recovering data erasures. On multicast delivery and especially on the time constrained streaming delivery where retransmission-based error recovery methods are not feasible, the most suitable error control method is the use of application layer forward error correction (AL-FEC) codes. In this work, we introduce a novel AL-FEC deployment policy over mobile multicast standards utilizing online algorithms. We aim on the efficient application of ALFEC protection with RaptorQ codes over multicast streaming delivery in the context of competitive analysis. We provide a competitiveness analysis model of AL-FEC application over mobile multicast real-time environments and we introduce an innovative online algorithm adjusting the introduced redundancy of AL-FEC protection according to the FEC encoding parameters in order to satisfy the individual constraints of a multicast streaming delivery.</p>},

keywords = {FEC},

pubstate = {published},

tppubtype = {conference}

}

@conference{2999,

title = {Evaluating RaptorQ FEC over 3GPP Multicast Services},

author = {Christos Bouras and Andreas Papazois and Vasileios Kokkinos and Nikos Kanakis},

url = {https://telematics.upatras.gr/wp-content/uploads/2024/01/4189046_7137.pdf},

year  = {2012},

date = {2012-08-01},

urldate = {2012-08-01},

booktitle = {The 8th International Wireless Communications & Mobile Computing Conference (IWCMC 2012), Limassol, Cyprus, pp. 257-262},

pages = {257 - 262},

abstract = {Third Generation Partnership Project (3GPP) introduced Multimedia Broadcast/Multicast Services (MBMS), in order to efficiently deliver the same content to multiple users over mobile cellular networks. To enhance the download and streaming delivery robustness against packet losses, 3GPP proposes the use of Forward Error Correction (FEC) on the application layer. The Application Layer FEC (AL-FEC) scheme that 3GPP standardized is based on the systematic, fountain Raptor code. In this work, in response to the emergence of an enhanced FEC scheme, we provide a performance evaluation of the existing standardized AL-FEC scheme with the newly introduced RaptorQ code. troducing a variety of simulation experiments, we analyze the performance behavior of each AL-FEC scheme considering several FEC encoding parameters. Furthermore, we 

try to verify the improvements that have emerged in AL-FEC providing enhanced capabilities in multicast services over next generation mobile networks.},

keywords = {FEC, LTE, MBMS},

pubstate = {published},

tppubtype = {conference}

}

@conference{3000,

title = {Enhaning Reliable Mobile Multicasting with RaptorQ FEC},

author = {Christos Bouras and Andreas Papazois and Vasileios Kokkinos and Nikos Kanakis},

url = {https://telematics.upatras.gr/4588is041/},

year  = {2012},

date = {2012-07-01},

urldate = {2012-07-01},

booktitle = {17th IEEE Symposium on Computers andCommunication (ISCC), Cappadocia, Turkey, pp. 82-87},

pages = {82-87},

abstract = {A crucial point on the successful deployment of multicast services is the enhanced reliability by means of advanced error control schemes. To this direction Third Generation 

Partnership Project (3GPP) has standardized exclusively for Multimedia Broadcast/Multicast Services (MBMS) the use of a Forward Error Correction (FEC) mechanism on the application layer based on Raptor codes. Since the standardized systematic, fountain Raptor code is now considered obsolete, the emergence of a new variant of Raptor codes, named RaptorQ, provides enhanced capabilities for mobile multicast services. In this paper, we provide a performance comparison of the standardized Raptor Application Layer FEC (AL-FEC) scheme with the very promising RaptorQ FEC code. We examine the enhancements that RaptorQ introduces on the AL-FEC protection robustness, providing a thorough performance analysis in comparison with the current Raptor FEC scheme. Furthermore, in order to verify the improved performance of RaptorQ, we provide several simulation results utilizing the ns-3 environment, considering the application of both the examined AL-FEC schemes over multicast services for next generation mobile networks.},

keywords = {FEC, LTE, MBMS},

pubstate = {published},

tppubtype = {conference}

}

@conference{2990,

title = {AL-FEC for Streaming Services over LTE Systems},

author = {Christos Bouras and Andreas Papazois and Vasileios Kokkinos and Nikos Kanakis},

url = {https://telematics.upatras.gr/4760pid1999633/},

year  = {2011},

date = {2011-10-01},

urldate = {2011-10-01},

booktitle = {14th International Symposiumon Wireless Personal Multimedia Communications, Brest, France, pp. 284-288},

pages = {284-288},

abstract = {The Third Generation Partnership Project (3GPP), recently introduced the evolution of the third generation (3G) cellular networks, the Long Term Evolution (LTE) telecommunication system. A key aspect of LTE specifications is the enhancement of Multimedia Broadcast/Multicast Services (MBMS), where the same content is transmitted to multiple users located in a specific service area. A significant point of the demanding multimedia services is the enhancement of the robustness against packet losses. To this direction, in order to support the efficient point-to-multipoint download and streaming delivery, 3GPP has included an Application Layer Forward Error Correction (AL-FEC) scheme in the MBMS standard. The standardized AL-FEC scheme is based on the systematic, fountain Raptor codes. In this paper, we investigate the application of AL-FEC over the MBMS streaming delivery method. We consider the benefits of AL-FEC for a seamless multimedia streaming transmission to multiple mobile users and we examine how the amount of FEC overhead can be adjusted under different packet loss conditions. For this purpose, we present a variety of realistic simulation scenarios for the performance evaluation of FEC considering several network and FEC encoding parameters. Furthermore, we provide suggestions in order to achieve efficient use of Raptor codes over LTE MBMS streaming services.},

keywords = {FEC, LTE, MBMS},

pubstate = {published},

tppubtype = {conference}

}

@conference{2983,

title = {Reliable Multicasting over LTE: A Performance Study},

author = {Christos Bouras and Antonios Alexiou and Andreas Papazois and Vasileios Kokkinos and Konstantinos Asimakis and Georgia Tseliou},

url = {https://telematics.upatras.gr/2179cc_070/},

year  = {2011},

date = {2011-06-01},

urldate = {2011-06-01},

booktitle = {16th IEEE Symposioum  on Computers and Communications (ISCC 2011), Kerkyra, Greece, pp. 603-608},

pages = {603 - 608},

abstract = {With the booming of multimedia services, the 3rd Generation Partnership Project (3GPP) has introduced the evolved Multimedia Multicast/Broadcast Service (e-MBMS) 

feature for LTE systems. The main objective of MBMS is to introduce real broadcast distribution capabilities into cellular systems. This purposed 3GPP to introduce the MBMS over a Single Frequency Network (MBSFN) operation. In this work we investigate the provision of MBMS service over a combination of MBSFN and PTM transmission schemes. We focus on the file repair procedure, because the distribution of binary data via MBMS must result in 100% error-free downloaded files. In order to achieve this goal, MBMS offers a Forward Error Correction (FEC) mechanism. Our simulation results show that there are some file repair schemes that achieve better performance as far as different network configurations are concerned. Furthermore, we compare all the file recovery methods and evaluate them against various network parameters in a realistic simulation environment.},

keywords = {FEC, LTE, MBMS, MBSFN},

pubstate = {published},

tppubtype = {conference}

}

@conference{2979,

title = {Enhancing FEC Application in LTE Cellular Networks},

author = {Christos Bouras and Antonios Alexiou and Andreas Papazois and Vasileios Kokkinos and Georgia Tseliou},

url = {https://telematics.upatras.gr/3883wd_2/},

year  = {2010},

date = {2010-10-01},

urldate = {2010-10-01},

booktitle = {IFIP Wireless Days 2010, Venice, Italy, pp. 1-5},

pages = {1 - 5},

abstract = {3rd Generation Partnership Project?s (3GPP) Long Term Evolution (LTE) is focused on enhancing the Universal Terrestrial Radio Access (UTRA). Evolved-Multimedia Broadcast and Multicast Service (e-MBMS) uses Multimedia Broadcast over a Single Frequency Network (MBSFN) operation in order to improve its performance. In MBSFN operation, data are transmitted simultaneously over the air from multiple tightly time-synchronized cells. Raptor codes have been standardized as the main application layer Forward Error Correction (FEC) method for e-MBMS due to the advanced error protection they offer and their overall performance. In this study, we investigate the application of FEC in MBSFN-enabled LTE cellular networks and we propose a new scheme that takes into account the properties of MBSFN in order to provide a more efficient operation of FEC during e-MBMS transmissions. The proposed scheme is compared with other file recovery methods and is evaluated against various network parameters in a realistic simulation environment.},

keywords = {FEC, LTE, MBMS, MBSFN},

pubstate = {published},

tppubtype = {conference}

}

@conference{2981,

title = {Adopting FEC for Reliable Multicasting over LTE Networks},

author = {Christos Bouras and Antonios Alexiou and Andreas Papazois and Vasileios Kokkinos and George Tsichritzis},

url = {https://telematics.upatras.gr/6262p307-alexiou/},

year  = {2010},

date = {2010-10-01},

urldate = {2010-10-01},

booktitle = {13th ACM International Conference on Modeling Analysis and Simulation of Wireless and Mobile Systems, Bodrum, Turkey, pp. 307-310},

pages = {307 - 310},

abstract = {The key feature for the provision of Multimedia Broadcast/Multicast Services (MBMS) in Long Term Evolution (LTE) networks is the Multimedia Broadcast over a Single 

Frequency Network (MBSFN). On the other hand, the use of Forward Error Correction (FEC) in mobile multicast transmission has significant advantages and the 3rd Generation Partnership Project (3GPP) has adopted the application layer FEC in the MBMS standard. In this paper, we investigate the impact of the application layer FEC over the MBSFN delivery method.},

keywords = {FEC, LTE, MBMS},

pubstate = {published},

tppubtype = {conference}

}

@conference{2966,

title = {The Impact of FEC on Mobile Multicast Power Control},

author = {Christos Bouras and Antonios Alexiou and Andreas Papazois},

url = {https://telematics.upatras.gr/8740pid1140067/},

year  = {2010},

date = {2010-05-01},

urldate = {2010-05-01},

booktitle = {The Sixth Advanced International Conference on Telecommunications (AICT 2010), Barcelona, Spain, pp. 1-6},

pages = {1-6},

abstract = {3GPP has standardized the use of forward error correction for the provision of reliable data transmission in the mobile multicast framework. In this paper we present a study 

of the impact of application layer forward error correction on power control during mobile multicast transmission. The evaluation is performed with the aid of a novel scheme that allows the simulation of FEC impact on both streaming delivery and download delivery over a multicast session. It is important that the proposed scheme incorporates the 

properties of an evolved mobile network, as they are determined by the 3GPP specifications.},

keywords = {FEC, LTE, MBMS, Power Control},

pubstate = {published},

tppubtype = {conference}

}

@conference{2964,

title = {Adopting forward error correction for multicasting over cellurar networks},

author = {Christos Bouras and Antonios Alexiou and Andreas Papazois},

url = {https://telematics.upatras.gr/10632621pid1130541/},

year  = {2010},

date = {2010-04-01},

urldate = {2010-04-01},

booktitle = {European Wireless 2010, Lucca, Italy, pp. 307-310},

pages = {307-310},

abstract = {FEC is an error control method that can be used to augment or replace other methods for reliable data transmission. Such schemes inevitably add a constant overhead in the transmitted data. However, they are so simple as to meet a prime objective for UMTS multicast services, that is scalability to applications with thousands of receivers. This is the reason that 3GPP recommends the use of FEC for MBMS framework. In this paper, we use a probabilistic model for the multicast user distribution in the network and we define a scheme for multicast data delivery that combines FEC with traditional ARQ. It is important that our analysis is compliant with the 3GPP specifications and considers the latest advances in mobile networks. In this framework we investigate the impact of FEC use, we examine whether it is beneficial, how the optimal FEC code dimensioning varies based on the network conditions, which parameters affect the optimal FEC code selection, and how they do it.},

keywords = {FEC, LTE, MBMS, MBSFN},

pubstate = {published},

tppubtype = {conference}

}