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Reliable multicasting over LTE: A performance study

Reliable multicasting over LTE: A performance study

引用

IEEE Symposium on computers and Communications (ISCC)

作者： Antonios Alexiou Konstantinos Asimakis Christos Bouras Vasileios Kokkinos Andreas Papazois Georgia Tseliou Computer Engineering and Informatics Department University of Patras Greece Research Academic Computer Technology Institute Patras Greece

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.

关键词： Maintenance engineering Forward error correction Encoding Receivers Topology Servers

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Optimizing the combination of MBSFN and PTM transmissions in LTE systems

Optimizing the combination of MBSFN and PTM transmissions in...

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Wireless Telecommunications Symposium, WTS

作者： Antonios Alexiou Christos Bouras Vasileios Kokkinos Andreas Papazois Georgia Tseliou Computer Engineering and Informatics Department University of Patras Greece Research Academic Computer Technology Institute Patras Greece

The 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.

关键词： Synchronization Topology Equations computer architecture Multimedia communication Algorithms

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Adapting the transmission reach in mixed line rates WDM transport networks

Adapting the transmission reach in mixed line rates WDM tran...

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International Conference on Optical Network Design and Modeling, ONDM

作者： K. Christodoulopoulos K. Manousakis E. Varvarigos Department of Computer Engineering and Informatics University of Patras Greece Research Academic Computer Technology Institute Patra Greece

We consider the problem of planning a mixed line rates (MLR) wavelength division multiplexing (WDM) transport optical network. In such networks, different modulation formats are usually employed to support the transmission at different line rates. Previously proposed planning algorithms, have used a transmission reach limit for each modulation format/line rate, mainly driven by single line rate systems. However, transmission experiments in MLR networks have shown that physical layer interference phenomena are more significant between transmissions that utilize different modulation formats. Thus, the transmission reach of a connection with a specific modulation format/line rate depends also on the other connections that co-propagate with it in the network. To plan a MLR WDM network, we present routing and wavelength assignment (RWA) algorithms that take into account the adaptation of the transmission reach of each connection according to the use of the modulation formats/line rates in the network. The proposed algorithms are able to plan the network so as to alleviate interference effects, enabling the establishment of connections of acceptable quality over paths that would otherwise be prohibited.

关键词： Modulation Optical fiber networks Planning Transponders Heuristic algorithms Wavelength division multiplexing Algorithm design and analysis

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Algorithmic aspects of optical network design

Algorithmic aspects of optical network design

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International Conference on Optical Network Design and Modeling, ONDM

作者： E. A. Varvarigos K. Christodoulopoulos Computer Engineering and Informatics Department University of Patras Greece Research Academic Computer Technology Institute Patra Greece

Optical network design problems fall in the broad category of network optimization problems. We give a short introduction on network optimization and general algorithmic techniques that can be used to solve complex and difficult network design problems. We apply these techniques to address the static Routing and Wavelength Assignment problem that is related to planning phase of a WDM optical network. We present simulation result to evaluate the performance of the proposed algorithmic solution.

关键词： Algorithm design and analysis Cost function Polynomials Optical fiber networks WDM networks Routing

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A hybrid signaling protocol for enhancing performance of OBS networks

A hybrid signaling protocol for enhancing performance of OBS...

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International Conference on Optical Network Design and Modeling, ONDM

作者： Franz Roeck Kostas Ramantas Erich Leitgeb Kyriakos Vlachos Institute of Broadband Communication University of Technology Graz Austria Computer Engineering and Informatics Department & Research Academic Computer Technology Institute University of Patras Rio Greece

A new hybrid signaling scheme is proposed in this work, that combines a two-way with an one-way reservation protocol. The key idea is to synchronize the assembly process with the reservation and hard reserve part of the end-to-end path in two way mode, for a duration equal to the burst assembly time. In this way, upon the arrival of the first packet in the assembly queue, the two-way reservation part of the signaling scheme may start simultaneously. Upon the completion of the burst assembly process, burst transmission may start immediately since the path has been successfully established for a certain number of hops. The framework that we propose benefits from the parallel execution of the signaling messages and the assembly process, and exploits the burstification delay to guarantee burst transmission for at least a part of the network path.

关键词： Assembly Delay Protocols Network topology Topology Least squares approximation

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Decoupling autopilot MIMO controller design

Decoupling autopilot MIMO controller design

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31st IASTED International Conference on Modelling, Identification, and Control, MIC 2011

作者： Bányász, Csilla Keviczky, László Dept. of Automation and Informatics Control Engineering Research Group of the H. Ac. of Sc. Computer and Automation Research Institute of the H. Ac. of Sc. Kende u 13-17 H-1111 Budapest Hungary

ISBN: (纸本)9780889868632

The principal lateral motion of an aircraft is described by a minimum of fourth order coupled state variable model. It is interesting to investigate how a decoupling controller can be designed. The Youla-parametrization is a simple method to design controllers. The KB-parametrization is a successful extension of this method for two-degree-of freedom (2DOF) systems. The paper extends this methodology for multivariable case and applies to the decoupling lateral control.

关键词： Controllers

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Cooperative vs. non-cooperative: Self-coexistence among selfish cognitive devices

Cooperative vs. non-cooperative: Self-coexistence among self...

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IEEE International Symposium on A World of Wireless, Mobile and Multimedia Networks

作者： Gardellin, Vanessa Das, Sajal K. Lenzini, Luciano Institute for Informatics and Telematics Italian National Research Council Via G. Moruzzi 1 56124 Pisa Italy Dept. of Computer Science and Engineering University of Texas at Arlington Arlington TX United States Dept. of Information Engineering University of Pisa Via Diotisalvi 2 56122 Pisa Italy

Cognitive networks address the spectrum shortage problem exploiting unused chunks of the frequency spectrum, i.e. channels. With the aim to opportunistically use these channels, cognitive devices (CDs) have been defin... 详细信息

ISBN: (纸本)9781457703515

关键词： IEEE Standards

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Efficient Computation of Approximate Pure Nash Equilibria in Congestion Games

Efficient Computation of Approximate Pure Nash Equilibria in...

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Annual IEEE Symposium on Foundations of computer Science

作者： Ioannis Caragiannis Angelo Fanelli Nick Gravin Alexander Skopalik Research Academic Computer Technology Institute & Department of Computer Engineering and Informatics University of Patras Rio Greece Division of Mathematical Sciences School of Physical and Mathematical Sciences Nanyang Technological University Singapore

Congestion games constitute an important class of games in which computing an exact or even approximate pure Nash equilibrium is in general PLS-complete. We present a surprisingly simple polynomial-time algorithm that computes O(1)-approximate Nash equilibria in these games. In particular, for congestion games with linear latency functions, our algorithm computes (2 +ε)-approximate pure Nash equilibria in time polynomial in the number of players, the number of resources and 1/ε. It also applies to games with polynomial latency functions with constant maximum degree d: there, the approximation guarantee is d o(d) . The algorithm essentially identifies a polynomially long sequence of best-response moves that lead to an approximate equilibrium; the existence of such short sequences is interesting in itself. These are the first positive algorithmic results for approximate equilibria in non-symmetric congestion games. We strengthen them further by proving that, for congestion games that deviate from our mild assumptions, computing ρ-approximate equilibria is PLS-complete for any polynomial-time computable ρ.

关键词： Games Polynomials Approximation algorithms Nash equilibrium Approximation methods Heuristic algorithms Complexity theory

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A Healthcare Application Based on Passive UHF RFID technology

A Healthcare Application Based on Passive UHF RFID Technolog...

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European Conference on Antennas and Propagation

作者： Anastasis C. Polycarpou George Gregoriou Loizos Papaloizou Panayiotis Polycarpou Antonis Dimitriou Aggelos Bletsas John N. Sahalos Cyprus Academic Research Institute (CARI)/Dept. of Electrical & Comp. Engineering of the University of Nicosia Dept. of Civil and Environmental Engineering University of Cyprus Dept. of Electrical & Computer Engineering Aristotle University of Thessaloniki Dept. of Electronic & Computer Engineering Technical University of Crete Physics Dept. Aristotle University of Thessaloniki AUTH Campus RCLab

ISBN: (纸本)9781457702501

This paper presents the design, implementation, and evaluation of a passive UHF radio frequency identification system that was recently installed at a hospital in Cyprus. The three main pillars of this pilot project was patient identification, real-time location service of medical assets, and drug inventory control and monitoring. In this paper, we present the main steps followed during the design and implementation phases, some of the main features of the system application, and major finding drawn after the evaluation and testing of the system in a realistic environment.

关键词： Drugs Radiofrequency identification Hospitals Antennas Antenna measurements Sensitivity

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Visualization of highly-dimensional data in 3D space

Visualization of highly-dimensional data in 3D space

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2011 11th International Conference on Intelligent Systems Design and Applications, ISDA'11

作者： Nguyen, Dat T. Dzwinel, Witold Cios, Krzysztof J. Computer Science Dept. School of Engineering Virginia Commonwealth University 401 W. Main Street Richmond VA 23238 United States Institute of Informatics AGH University of Science and Technology Al. Mickiewicza 30 30-059 Krakow Poland IITiS Polish Academy of Sciences Poland

ISBN: (纸本)9781457716751

Molecular dynamics method is used for computing equilibrium in many physical systems as well as a powerful solver used for minimization of criterion functions such as the stress function in multidimensional scaling. We have designed a new tool for visualization of highly-dimensional data in 3D based on the method. We have shown on several data sets that the new method is fast and accurate. © 2011 IEEE.

关键词： Visualization

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