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检索条件"机构=RA Computer Technology Institute and Department of Computer Engineering and Informatics"

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An experimental study of greedy routing algorithms

An experimental study of greedy routing algorithms

引用

International Conference on High Performance Computing & Simulation (HPCS)

作者： Stavros Athanassopoulos Christos Kaklamanis Ilias Laftsidis Evi Papaioannou Research Academic Computer Technology Institute & Department of Computer Engineering and Informatics University of Patras Rio Greece

The “small world” phenomenon, i.e., the fact that the global social network is strongly connected in the sense that every two persons are inter-related through a small chain of friends, has attracted research attention and has been strongly related to the results of the social psychologist's Stanley Milgram experiments; properties of social networks and relevant problems also emerge in peer-to-peer systems and their study can shed light on important modern network design properties. In this paper, we have experimentally studied greedy routing algorithms, i.e., algorithms that route information using “long-range” connections that function as shortcuts connecting “distant” network nodes. In particular, we have implemented greedy routing algorithms, and techniques from the recent literature in networks of line and grid topology using parallelization for increasing efficiency. To the best of our knowledge, no similar attempt has been made so far.

关键词： Routing Peer to peer computing Algorithm design and analysis Probability distribution Network topology Social network services Probabilistic logic

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Power management of video transmission on wireless networks for multiple receivers

Power management of video transmission on wireless networks ...

引用

International Conference on Software, Telecommunications and computer Networks (SoftCOM)

作者： Christos Bouras Kostas Stamos Giannis Zaoudis Research Academic Computer Technology Institute Computer Engineering and Informatics Department University of Patras Patras Greece

The main idea of this paper is an efficient power management mechanism in order to transmit to multiple receivers. The proposed mechanism consists of a module for efficiently managing the power when transmitting video over wireless networks by using the TFRC protocol reports and then adjusts transmission power using a binary-like approach. In order to extend to multiple receivers, several methods are proposed for calculating an appropriate power transmission level based on all TFRC reports and adjust the server's transmission power accordingly.

关键词： Receivers Protocols PSNR Wireless networks Streaming media Multimedia communication

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Provision of multimedia content search and retrieval services to users on the move

Provision of multimedia content search and retrieval service...

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1st International Conference on User Centric Media, UCMedia 2009

作者： Giakoumis, Dimitrios Tzovaras, Dimitrios Daras, Petros Hassapis, George Centre for Research and Technology Hellas Informatics and Telematics Institute Charilaou-Thermi Road Rd. 57001 Thermi Thessaloniki Greece Aristotle University of Thessaloniki Department of Electrical and Computer Engineering Greece

ISBN: (纸本)3642126294

In this paper we present a mobile application for the seamless and effective provision of networked multimedia content search and delivery services to users on the move. The VICTORY project had as an outcome a framework enabling users to search and retrieve multimedia objects over a distributed Peer to Peer - based network. Building upon the VICTORY framework, a mobile user agent was developed, which by the use of appropriate Web Services has the ability to connect to different P2P communities in order to search for and retrieve multimedia content. The content delivered follows the notion of the "MultiPedia" object, defined for the purpose of seamless and effective content search and delivery within the VICTORY Framework. © institute for computer Sciences, Social-informatics and Telecommunications engineering 2010.

关键词： Web services

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Efficient MCS selection for MBSFN transmissions over LTE networks

Efficient MCS selection for MBSFN transmissions over LTE net...

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IFIP Wireless Days, WD

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

Long 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.

关键词： Signal to noise ratio Interference Throughput Bandwidth Topology Base stations Modulation

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Enhancing FEC application in LTE cellular networks

Enhancing FEC application in LTE cellular networks

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IFIP Wireless Days, WD

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

3 rd 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.

关键词： Forward error correction Encoding Maintenance engineering Receivers Telecommunications OFDM Servers

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Path Protection in WDM Networks with Quality of Transmission Limitations

Path Protection in WDM Networks with Quality of Transmission...

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IEEE International Conference on Communications (ICC)

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

We consider path protection in the routing and wavelength assignment (RWA) problem for impairment constrained WDM optical networks. The proposed multicost RWA algorithms select the primary and the backup lightpaths by accounting for physical layer impairments. The backup lightpath may either be activated (1+1 protection) or it may be reserved and not activated, with activation taking place when/if needed (1:1 protection). In case of 1:1 protection the period of time where the quality of its transmission (QoT) is valid, despite the possible establishment of future connections, should be preserved, so as to be used in case the primary lightpath fails. We show that, by using the multicost approach for solving the RWA with protection problem, great benefits can be achieved both in terms of the connection blocking rate and in terms of the validity period of the backup lightpath. Moreover the multicost approach, by providing a set of candidate lightpaths for each source destination pair, instead of a single one, offers ease and flexibility in selecting the primary and the backup lightpaths.

关键词： Protection WDM networks Optical fiber networks Costs Physical layer Degradation computer networks Optical computing Peer to peer computing Wavelength routing

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Performance Evaluation of Node Architectures with Color and Direction Constraints in WDM Networks

Performance Evaluation of Node Architectures with Color and ...

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2010 IEEE Global Telecommunications Conference GLOBECOM 2010

作者： Konstantinos Manousakis Panagiotis Kokkinos Emmanouel Varvarigos Computer Engineering and Informatics Department University of Patras Greece Research Academic Computer Technology Institute Patras Greece

We consider routing and wavelength assignment (RWA) in a WDM network consisting of optical cross-connect (OXC) nodes that have color and direction constraints. These restricted node architectures have a smaller cost than the more flexible (and best performing) ones usually assumed in the RWA problem. This introduces an interesting tradeoff between the network performance achieved, in terms of network blocking and number of manual interventions required, and the cost of the node architecture used. In the process of comparing the node architectures, we propose an adaptation of an RWA algorithm that accounts for the lack of node flexibility, aiming to achieve using the constrained node architectures, performance similar to that obtained with the fully flexible node architectures. Additionally, we consider different transponder assignment policies and determine their effect on performance.

关键词： Peer to peer computing Optical fiber networks Availability Transponders Fiber optics computer architecture

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Dynamic routing and wavelength assignment in transparent WDM networks with amplifiers' power constraints

Dynamic routing and wavelength assignment in transparent WDM...

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Future Network and Mobile Summit

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

In a wavelength-routed optical network, the signal remains in the optical domain over the entire route (lightpath) from source to destination node. Thus, while propagating through the network, the signal quality may degrade as it encounters physical impairments. In this paper, we study the establishment of new connections in such a network in the presence of amplifier optical power constraints. In particular, a Multicost Impairment Aware Online RWA (IA-RWA) algorithm is extended to include amplifier power constraints. The extended algorithm accounts not only for the channel utilization in the network but also for the amplifiers' possible saturation, which change as new connections are established or released, in order to calculate the noise variances that correspond to physical impairments on the links. We find that when these effects are taken into account the two algorithms achieve similar performance when the amplifiers operate in the linear region. In the case, however, where the amplifiers are saturated, the extended algorithm exhibits better performance compared with the previously proposed algorithm, in terms of blocking probability and frequency of reroutings required.

关键词： Gain Optical fiber amplifiers Optical fiber networks Erbium-doped fiber amplifier Noise Optical fiber dispersion Power generation

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The Impact of FEC on Mobile Multicast Power Control

The Impact of FEC on Mobile Multicast Power Control

引用

Advanced International Conference on Telecommunications (AICT)

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

ISBN: (纸本)9781424467488;9780769540214

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.

关键词： Power control Forward error correction Streaming media Power engineering computing Telecommunication computing Data communication radio access networks Energy consumption Power engineering and energy informatics

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An adaptive medium access control scheme for mobile ad hoc networks under self-similar traffic

An adaptive medium access control scheme for mobile ad hoc n...

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作者： Abu-Tair, Mamun Min, Geyong Ni, Qiang Liu, Hong Institute of Electronics Communications and Information Technology Queens University Belfast Belfast United Kingdom Department of Computing School of Computing Informatics and Media University of Bradford Bradford United Kingdom Electronic and Computer Engineering Division School of Engineering and Design Brunel University West London United Kingdom School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China

An important function of wireless networks is to support mobile computing. Mobile Ad hoc NETworks (MANETs) consist of a collection of mobile stations communicating with each other without the use of any pre-existent infrastructure. The self-organization characteristic of MANETs makes them suitable for many real-world applications where network topology changes frequently. As a result, the development of efficient MAC (Medium Access Control) protocols in MANETs is extremely challenging. Self-similar traffic with scale-invariant burstiness can generate bursty network loads and thus seriously degrade the system performance. This paper presents an adaptive MAC scheme which dynamically adjusts the increasing function and resetting mechanism of contention window based on the status of network loads. The performance of this scheme is investigated in comparison with the legacy DCF (Distributed Coordination Function) under self-similar traffic and different mobility models. The performance results reveal that the proposed scheme is able to achieve the higher throughput and energy efficiency as well as lower end-to-end delay and packet drop probability than the legacy DCF. © 2009 Springer Science+Business Media, LLC.

关键词： Medium access control

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