01999nas a2200205 4500008004100000245013600041210006900177300001400246490000700260520122000267653000801487653001001495653000801505100002101513700002201534700002201556700002401578700002401602856016701626 2013 eng d00aModulation and coding scheme selection in multimedia broadcast over a single frequency network-enabled long-term evolution networks0 aModulation and coding scheme selection in multimedia broadcast o a1603-16190 v253 a

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.

10aLTE10aMBSFN10aMCS1 aBouras, Christos1 aAlexiou, Antonios1 aPapazois, Andreas1 aKokkinos, Vasileios1 aTsichritzis, George uhttp://telematics.upatras.gr/telematics/publications/modulation-and-coding-scheme-selection-multimedia-broadcast-over-single-frequency-network-enabled?language=en02382nas a2200205 4500008004100000245009500041210006900136300001200205520163600217653001801853653000801871653001001879100002101889700002201910700002201932700002401954700002701978700002102005856015002026 2012 eng d00aCost Optimization of MBSFN and PTM Transmissions for Reliable Multicasting in LTE Networks0 aCost Optimization of MBSFN and PTM Transmissions for Reliable Mu a277-2933 aLong 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;10aCost analysis10aLTE10aMBSFN1 aBouras, Christos1 aAlexiou, Antonios1 aPapazois, Andreas1 aKokkinos, Vasileios1 aAsimakis, Konstantinos1 aTseliou, Georgia uhttp://telematics.upatras.gr/telematics/publications/cost-optimization-mbsfn-and-ptm-transmissions-reliable-multicasting-lte-networks?language=en01459nas a2200193 4500008004100000245007600041210006900117260002000186300001000206520079400216653000801010653000901018653001001027100002101037700002201058700002401080700002701104856013401131 2012 eng d00aGenetic Optimization for Spectral Efficient Multicasting in LTE Systems0 aGenetic Optimization for Spectral Efficient Multicasting in LTE  c19-21 September a54-593 a

Past research has proposed the usage of assisting cells with Multimedia Broadcast/Multicast Service (MBMS) over a Single Frequency Network (MBSFN) to increase the Spectral Efficiency (SE) of LTE. In this paper we propose and investigate a method for optimizing the power consumption of the network while retaining an acceptable SE for most users. We design an algorithm that makes use of genetic optimization and analytical estimation of the SE. The algorithm is implemented in a novel simulation tool that allows experimentation over various user distributions and LTE deployments similar to the real-world ones. This simulation tool estimates the SE of each user and is able to optimize the network deployment by adjusting the individual transmission power levels for each cell.

10aLTE10aMBMS10aMBSFN1 aBouras, Christos1 aPapazois, Andreas1 aKokkinos, Vasileios1 aAsimakis, Konstantinos uhttp://telematics.upatras.gr/telematics/publications/genetic-optimization-spectral-efficient-multicasting-lte-systems?language=en01946nas a2200181 4500008004100000245005800041210005800099300001200157490000700169520136300176653000801539653001001547100002101557700002201578700002401600700002401624856011601648 2012 eng d00aPerformance Evaluation of LTE for MBSFN Transmissions0 aPerformance Evaluation of LTE for MBSFN Transmissions a227-2400 v183 a

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.

10aLTE10aMBSFN1 aBouras, Christos1 aAlexiou, Antonios1 aKokkinos, Vasileios1 aTsichritzis, George uhttp://telematics.upatras.gr/telematics/publications/performance-evaluation-lte-mbsfn-transmissions?language=en01798nas a2200193 4500008004100000245009000041210006900131300001300200520110000213653000801313653000901321653001001330100002101340700002201361700002201383700002401405700002701429856014801456 2011 eng d00aCombining MBSFN and PTM Transmissions Schemes for Resource Efficiency in LTE Networks0 aCombining MBSFN and PTM Transmissions Schemes for Resource Effic a 56 - 673 aLong Term Evolution (LTE) systems allow the transmission of rich multimedia services by utilizing the Multimedia Broadcast/Multicast Service (MBMS) over a Single Frequency Network (MBSFN). During MBSFN transmission a time-synchronized common waveform is transmitted from multiple cells. The 3rd Generation Partnership Project (3GPP) has specified that Point-to-Multipoint (PTM) transmission can be used in combination with MBSFN to provide MBMS-based services. In this paper we evaluate the combined transmission scheme in terms of Resource Efficiency (RE). The evaluation is performed through simulation experiments for various user distributions and LTE network configurations. The experiments are conducted with the aid of a proposed algorithm, which estimates the Spectral Efficiency (SE) of each cell and the RE of the network, and is also able to formulate the optimal network deployment that maximizes the network?s RE. For each of the examined scenarios, we present the most efficient solution (in terms of RE) selected by our algorithm and we compare it with other transmission schemes.10aLTE10aMBMS10aMBSFN1 aBouras, Christos1 aAlexiou, Antonios1 aPapazois, Andreas1 aKokkinos, Vasileios1 aAsimakis, Konstantinos uhttp://telematics.upatras.gr/telematics/publications/combining-mbsfn-and-ptm-transmissions-schemes-resource-efficiency-lte-networks?language=en01753nas a2200193 4500008004100000245007700041210006900118260001600187520108700203653000801290653000901298653001001307100002101317700002201338700002201360700002401382700002101406856013201427 2011 eng d00aOptimizing the Combination of MBSFN and PTM Transmissions in LTE Systems0 aOptimizing the Combination of MBSFN and PTM Transmissions in LTE cApril 13-153 aThe 3rd Generation Partnership Project (3GPP) has introduced the evolved Multimedia Broadcast/Multicast Service (e-MBMS) feature for cellular systems as an evolution to the existing MBMS service. To support e-MBMS in Long Term Evolution (LTE) systems, 3GPP recommends the use of Point-to- Multipoint (PTM) transmissions and MBMS over a Single Frequency Network (MBSFN). MBSFN is a new feature where a time-synchronized common waveform is transmitted from multiple cells. In this paper we investigate the provision of MBMS service over a combination of MBSFN and PTM transmission methods. A cost analysis of the MBMS service is presented based on the transmission cost over all the interfaces and nodes of the LTE architecture. We evaluate the performance of this transmission scheme from telecommunication cost perspective and we compare it with other transmission schemes. The performance evaluation has been performed with the aid of a new simulation tool that estimates the cost for the MBMS provision under different network topologies, MBSFN deployments and user distributions.10aLTE10aMBMS10aMBSFN1 aBouras, Christos1 aAlexiou, Antonios1 aPapazois, Andreas1 aKokkinos, Vasileios1 aTseliou, Georgia uhttp://telematics.upatras.gr/telematics/publications/optimizing-combination-mbsfn-and-ptm-transmissions-lte-systems?language=en01742nas a2200229 4500008004100000245005600041210005500097260002100152300001500173520103400188653000801222653000801230653000901238653001001247100002101257700002201278700002201300700002401322700002701346700002101373856011801394 2011 eng d00aReliable Multicasting over LTE: A Performance Study0 aReliable Multicasting over LTE A Performance Study cJune 28 - July 1 a 603 - 6083 aWith 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.10aFEC10aLTE10aMBMS10aMBSFN1 aBouras, Christos1 aAlexiou, Antonios1 aPapazois, Andreas1 aKokkinos, Vasileios1 aAsimakis, Konstantinos1 aTseliou, Georgia uhttp://telematics.upatras.gr/telematics/publications/reliable-multicasting-over-lte-performance-study?language=en01643nas a2200193 4500008004100000245007800041210006900119260001900188300001200207520099100219653000801210653000801218653000901226653001001235100002101245700002201266700002201288856013901310 2010 eng d00aAdopting forward error correction for multicasting over cellurar networks0 aAdopting forward error correction for multicasting over cellurar c12 - 15 April  a307-3103 a

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.

10aFEC10aLTE10aMBMS10aMBSFN1 aBouras, Christos1 aAlexiou, Antonios1 aPapazois, Andreas uhttp://telematics.upatras.gr/telematics/publications/adopting-forward-error-correction-multicasting-over-cellurar-networks?language=en01700nas a2200193 4500008004100000245004800041210004800089260002200137300001500159520109800174653001801272653000801290653001001298100002101308700002201329700002401351700002401375856010701399 2010 eng d00aCommunication Cost Analysis of MBSFN in LTE0 aCommunication Cost Analysis of MBSFN in LTE cSeptember 26 - 30 a 1366-13713 aLong Term Evolution (LTE) is the latest step towards 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 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 paper 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. 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.10aCost analysis10aLTE10aMBSFN1 aBouras, Christos1 aAlexiou, Antonios1 aKokkinos, Vasileios1 aTsichritzis, George uhttp://telematics.upatras.gr/telematics/publications/communication-cost-analysis-mbsfn-lte?language=en01707nas a2200205 4500008004100000245007000041210006900111260002000180520102200200653000801222653000901230653001001239653000801249100002101257700002201278700002201300700002401322700002401346856013101370 2010 eng d00aEfficient MCS Selection for MBSFN Transmissions over LTE Networks0 aEfficient MCS Selection for MBSFN Transmissions over LTE Network cOctober 20 - 223 aLong Term Evolution (LTE), the next-generation network beyond 3G, is designed to support the explosion in demand for bandwidth-hungry multimedia services that are already experienced in wired networks. To support Multimedia Broadcast/Multicast Services (MBMS), LTE offers functionality to transmit MBMS over a Single Frequency Network (MBSFN), where a time-synchronized common waveform is transmitted from multiple cells for a given duration. This significantly improves the Spectral Efficiency (SE) compared to conventional MBMS operation. The achieved SE is mainly determined by the Modulation and Coding Scheme (MCS) utilized by the LTE physical layer. In this paper we propose and evaluate 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 most suitable approach for the corresponding users? distribution.10aLTE10aMBMS10aMBSFN10aMCS1 aBouras, Christos1 aAlexiou, Antonios1 aPapazois, Andreas1 aKokkinos, Vasileios1 aTsichritzis, George uhttp://telematics.upatras.gr/telematics/publications/efficient-mcs-selection-mbsfn-transmissions-over-lte-networks?language=en01674nas a2200205 4500008004100000245005500041210005500096260002000151520103500171653000801206653000801214653000901222653001001231100002101241700002201262700002201284700002401306700002101330856011701351 2010 eng d00aEnhancing FEC Application in LTE Cellular Networks0 aEnhancing FEC Application in LTE Cellular Networks cOctober 20 - 223 a3rd 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.10aFEC10aLTE10aMBMS10aMBSFN1 aBouras, Christos1 aAlexiou, Antonios1 aPapazois, Andreas1 aKokkinos, Vasileios1 aTseliou, Georgia uhttp://telematics.upatras.gr/telematics/publications/enhancing-fec-application-lte-cellular-networks?language=en01676nas a2200217 4500008004100000245006600041210006500107260002000172300001500192520097500207653000801182653000901190653001001199653000801209100002101217700002201238700002201260700002401282700002401306856012801330 2010 eng d00aSpectral Efficiency Performance of MBSFN-enabled LTE Networks0 aSpectral Efficiency Performance of MBSFNenabled LTE Networks cOctober 11 - 13 a 361 - 3673 aLong 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 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. This enables over-the-air combining, thus improving the Signal to Interference plus Noise Ratio (SINR) and spectral efficiency (SE) significantly compared to conventional MBMS operation. In this paper, we analytically calculate the SE performance achieved in a MBSFN area for a dynamically changing user topology and different modulation and coding schemes (MCS). Finally, based on the SE measurement, we determine the MCS scheme that either maximizes or achieves a target SE for the corresponding user distribution.10aLTE10aMBMS10aMBSFN10aMCS1 aBouras, Christos1 aAlexiou, Antonios1 aPapazois, Andreas1 aKokkinos, Vasileios1 aTsichritzis, George uhttp://telematics.upatras.gr/telematics/publications/spectral-efficiency-performance-mbsfn-enabled-lte-networks?language=en