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Bridging UMTS and multicast routing in ns-2 1

Bridging UMTS and multicast routing in ns-2

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1st International ICST Conference on Simulation Tools and Techniques for Communications, Networks and Systems, SIMUTools 2008

作者： Alexiou, Antonios Bouras, Christos Papazois, Andreas Research Academic Computer Technology Institute Computer Engineering and Informatics Department University of Patras PatrasGR 26500 Greece Computer Engineering and Informatics Department University of Patras PatrasGR 26500 Greece

ISBN: (纸本)9789639799233

In this paper, we present the design and the implementation of a novel scheme for the multicast transmission of data over Universal Mobile Telecommunications System (UMTS) networks. The proposed scheme is implemented as an ns-2 network simulator module which can be employed to investigate various aspects of UMTS multicast. Apart from the normal multicast transmission over UMTS, we consider the handling of exceptional cases induced by user mobility scenarios. The proposed scheme is in accordance with the current specifications of the Multimedia Multicast/Broadcast Service (MBMS) defined by the 3rd Generation Partnership Project (3GPP) and introduces minor modifications in the UMTS architecture and the mobility management mechanisms. The performance of the proposed scheme is validated and analyzed through simulation experiments. Finally, the simulation results are presented along with their analysis. Copyright © 2008 ICST.

关键词： Universal Mobile Telecommunications System

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A general analytical method for the performance evaluation of multistage interconnection networks supporting multi-class priority traffic

A general analytical method for the performance evaluation o...

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4th Advanced International Conference on Telecommunications, AICT 2008

作者： Garofalakis, John Stergiou, Eleftherios Department of Computer Engineering and Informatics University of Patras Research Academic Computer Technology Institute Patras Greece Department Teleinformatics and Communication ATEI of Epirus Arta Greece

ISBN: (纸本)9780769531625

In this paper, our investigation focuses on the performance evaluation of Omega multistage interconnection networks which can natively support multi-class priority traffic. For this reason, a multibuffered, single server switching element is presented and used in the construction of those networks, providing thus better quality of services. The performance evaluation model is based on steady state queuing analysis that leads to a novel utilization's formula. Based on the proposed analysis, other major performance indicators can also be accurately calculated. The analytical method was meticulously validated by classic simulation and a part of obtained results was also compared by existing related work. Moreover, the proposed analytical method was found to be very accurate on performance estimations for various network sizes under different offered loads supporting multi-priority traffic. The rationale behind investigating a multi-priority traffic system is to provide efficient networks supporting optimum quality of services (i.e. streaming media vs. file transfer). © 2008 IEEE.

关键词： Media streaming

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Fast power-up active link protection in autonomous distributed transmitter power control

Fast power-up active link protection in autonomous distribut...

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International Wireless Communications and Mobile Computing Conference, IWCMC 2008

作者： Gitzenis, Savvas Bambos, Nicholas Informatics and Telematics Institute Centre for Research and Technology Hellas Greece Dept. of Computer and Communication Engineering University of Thessaly Greece Electrical Engineering Dept. Stanford University

ISBN: (纸本)9781424422029

In this work, we propose an enhancement to the DPC/ALP (Distributed Power Control with Active Link Protection) algorithm that allows fast power ramp-up without compromising the ALP guarantee. The original DPC algorithm was first augmented with ALP to provide absolute performance guarantees. The basis of Active Link Protection lies on constraining the rate of the new links' transmission power increase during the admission process, inducing a trade-off between the duration of the admission process and the network capacity reserved for absorbing the SINR fluctuations. Thus, to minimize the capacity loss, power-up should be slow, prolonging admission delay. In the new scheme, the power-up is accelerated when congestion is low, via test transmissions. Specifically, pairs of mini slots are interleaved between payload-carrying slots. In the first minislot, a link has the opportunity to carry out a test transmission in the wireless channel at an arbitrarily high power level, greater than what DPC/ALP allows. The purpose of this test transmission is to communicate the desired transmission power to the other links in the network neighborhood. The latter respond in the second mini-slot, indicating their distress if the first mini-slot transmissions generated excessive interference to their receivers. The absence of transmission at the second mini-slot signifies that no link has opposed, thus the link is free to use the first mini-slot's high power level in their subsequent slots, realizing the fast power ramp up. In contrast, if a transmission is sensed in the second mini-slot (emanating from one or more links in distress-typical under network congestion, when links are closely packed), the power ramp up will revert to the standard increase of DPC/ALP. © 2008 IEEE.

关键词： Economic and social effects

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A 6/5-approximation algorithm for the maximum 3-cover problem

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33rd International Symposium on Mathematical Foundations of computer Science, MFCS 2008

作者： Caragiannis, Ioannis Monaco, Gianpiero Research Academic Computer Technology Institute Department of Computer Engineering and Informatics University of Patras 26500 Rio Greece Department of Computer Science University of L'Aquila Via Vetoio Coppito 67100 L'Aquila Italy

ISBN: (纸本)3540852379

In the maximum cover problem, we are given a collection of sets over a ground set of elements and a positive integer w, and we are asked to compute a collection of at most w sets whose union contains the maximum number of elements from the ground set. This is a fundamental combinatorial optimization problem with applications to resource allocation. We study the simplest APX-hard variant of the problem where all sets are of size at most 3 and we present a 6/5-approximation algorithm, improving the previously best known approximation guarantee. Our algorithm is based on the idea of first computing a large packing of disjoint sets of size 3 and then augmenting it by performing simple local improvements. © 2008 Springer-Verlag Berlin Heidelberg.

关键词： Approximation algorithms

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Extending the functionality of RTP/RTCP implementation in network simulator (NS-2) to support TCP friendly congestion control 1

Extending the functionality of RTP/RTCP implementation in ne...

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1st International ICST Conference on Simulation Tools and Techniques for Communications, Networks and Systems, SIMUTools 2008

作者： Bouras, Christos Gkamas, Apostolos Kioumourtzis, Georgios Research Academic Computer Technology Institute University of Patras N. Kazantzaki Str. Rion26500 Greece University of Patras Department of Computer Engineering and Informatics Rion Patras26500 Greece

ISBN: (纸本)9789639799233

In this paper, we present a modification of the ns2 code for the RTP/RTCP protocols. The legacy RTP/RTCP code in ns2 has not yet been validated but it provides a framework of the protocol's specification for experimental use. We have modified the code by adding all the RTP/RTCP protocol's attributes that are defined in RFC 3550 and related to QoS metrics. We have also implemented additional algorithms and functions in order to enhance our modified code with TCP friendly bandwidth share behavior. Our protocol, named RTPUP ("UP" stands for the University of Patras), is offered as a package and is fully documented so that it can be used for simulations and research within the ns2 simulation environment. Copyright © 2008 ICST.

关键词： Transmission control protocol

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TCP performance in wireless Ad hoc networks

TCP performance in wireless Ad hoc networks

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8th International Symposium on computer Networks, ISCN'08

作者： Yilmaz, Semra Erten, Y.M. Informatics Institute Middle East Technical University Ankara Turkey Dept. of Computer Engineering TOBB University of Economics and Technology Ankara Turkey

ISBN: (纸本)9789755182957

In this study a survey of research on congestion control in wireless ad hoc networks is presented. Different proposals are discussed to show their strong and weak points and an attempt is made to compare them with each other. Finally the importance of a solution which considers both wireless losses and route changes is presented as a future work to be pursued. The proposed approach shall be based on improving the weaknesses of TCP using RTT. © 2008 by Bogaziçi University.

关键词： Transmission control protocol

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Efficient delivery of MBMS multicast traffic over HSDPA

Efficient delivery of MBMS multicast traffic over HSDPA

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IEEE Symposium on computers and Communications (ISCC)

作者： Antonios Alexiou Christos Bouras Evangelos Rekkas Research Academic Computer Technology Institute Greece and Computer Engineering and Informatics Department University of Patras Greece

Multimedia Broadcast/Multicast Service (MBMS) and High-Speed Downlink Packet Access (HSDPA) are two key technologies that constitute a significant step towards the Mobile Broadband. MBMS was introduced by the third Generation Partnership Project (3GPP) in order to support broadcast and multicast communication over wireless networks and in particular over Universal Mobile Telecommunications System (UMTS). Concurrently, HSDPA aims to ensure the transmission of high peak data rates and increase system capacity. In this paper we evaluate the performance of MBMS multicast transmission over the premier transport channel used in HSDPA, named High Speed-Downlink Shared Channel (HS-DSCH). Due to the fact that downlink transmission power is the scarcest resource in UMTS networks, the evaluation is performed through an analytical dimensioning of the MBMS downlink transmission power. Furthermore, the impacts of power allocation on MBMS capacity are investigated.

关键词： Interference Downlink Multiaccess communication Signal to noise ratio Spread spectrum communication 3G mobile communication Throughput

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Power saving methods for MBMS transmissions in UTRAN

Power saving methods for MBMS transmissions in UTRAN

引用

IEEE Symposium on computers and Communications (ISCC)

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

The demand for wireless multimedia communications thrives in todaypsilas consumer and corporate market. The need to evolve multimedia applications and services is at a critical point given the proliferation and integration of wireless systems. multimedia broadcast multicast services (MBMS) was introduced in third generation partnership project (3GPP) Release 6 in order to more efficiently use network and radio resources for the transmission of multimedia data, both in the core network and most importantly in the air interface of UTRAN (UMTS terrestrial radio access network). However, several obstacles, regarding the high power requirements, should be overcome for the realization of MBMS. The fact that Node Bpsilas transmission power is a limited resource and must be shared among all MBMS users in a cell indicates the need for power control during MBMS transmissions. Several techniques, such as dynamic power setting and macro diversity combining, have been proposed in order to reduce the power requirements of delivering multicast traffic to MBMS users. This paper examines the efficiency of the utilization of these power saving techniques, by presenting simulation results that will reveal the amount of power that is saved.

关键词： Diversity reception Gain Switches Power demand Propagation losses 3G mobile communication Downlink

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Emulating lossless, one-way signaling protocols in OBS networks with traffic prediction

Emulating lossless, one-way signaling protocols in OBS netwo...

引用

International Conference on Optical Network Design and Modeling, ONDM

作者： Demetris Monoyios Kyriakos Vlachos Computer Engineering and Informatics Department & Research Academic Computer Technology Institute University of Patras Rio Greece

In this paper, we propose a new scheme for on demand reservation of capacity in OBS networks, emulating one-way signaling protocols. The proposed framework relies on the combination of a two-way reservation protocol and a burst assembly scheme with a burstification delay enforced to be the round-trip-time and which incorporates a Least Mean Square filter to predict burst length. Upon the arrival of the first packet in the burst queue, a control packet (setup message) is generated and transmitted to reserve resources, based on the prediction filter. In this way the reservation process starts/ends simultaneously with the burst assembly process. In this paper, we present the main features of the proposed scheme, evaluate its performance for both homogeneous and non-homogeneous traffic and we further propose an extension with aggressive over-provisioning of resources that can guarantee lossless operation even for extremely cases of bursty traffic.

关键词： Protocols Telecommunication traffic Assembly Optical losses Traffic control Optical buffering Filters computer networks Delay Switches

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An adaptive burst assembly scheme for OBS-GRID networks

An adaptive burst assembly scheme for OBS-GRID networks

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International Symposium on Communication Systems, Networks and Digital Signal Processing, CNSDSP

作者： Nikos Korkakakis Kyriakos Vlachos Research Academic Computer Technology Institute and Computer Engineering and Informatics Department University of Patras Patras Greece

This paper addresses the problem of burst assembly in OBS-GRID networks and particularly the TCP throughput maximization problem for large file sizes. For that purpose, a novel adaptive size-based approach is proposed, following some probabilistic methods and considering the effect of the burstification process in the overall transport system. The scheme has been evaluated in a high capacity GRID network. It was found that the proposed scheme results in shorter file transfer times, a significant higher TCP throughout, thus yielding a positive impact at the grid mechanics. The performance of the scheme is compared to that of a timer-based algorithm.

关键词： Assembly Adaptation model Delay Approximation algorithms Optical fiber networks Heuristic algorithms Algorithm design and analysis

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