Guest Editorial
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| Title | Guest Editorial |
| Authors | |
| Abstract | This special issue of the Journal of Networks includes mainly extended versions of selected papers accepted and presented at the 2009 International Symposium on Performance Evaluation of Computer and Telecommunication Systems (SPECTS 2009). Only papers with excellent review scores were invited to submit extended versions to this Special Issue, which have undergone a second review process. The selected papers address a variety of topics related to the performance evaluation of communication networks and systems.In the first paper, “Analysis of a Buffered Optical Switch with General Interarrival Times”, by Conor McArdle, Daniele Tafani and Liam P. Barry, the authors developed a relatively simple model for the analysis of an OBS (Optical Burst Switching) node with FDLs (Fiber Delay Lines) by applying circuit switching analysis methods. The model may be used to evaluate performance under any general independent (GI) traffic stream that may be expressed in terms of the LST (Laplace-Stieltjes transform) of the interarrival distribution. The analysis is formulated in terms of virtual traffic flows within the optical switch from which expressions for burst blocking probability, fiber delay line occupancy and mean delay are derived.The second paper, “Comparison of the Design Characteristics of MMI Wavelength Demultiplexers Using Different Approaches by Computing the Effective Index”, authored by M. Najjar, R. Rejeb, H. Rezig and M. S. Obaidat, investigates the design characteristics of a wavelength demultiplexer using the effective index method in order to determine the propagation constants and field distributions. In order to analyze the impact of computation method on the design characteristics of the demultiplexer, the effective index is computed by an analytic approach. A new algorithm for developing an analytic model is proposed.In the third paper, “Design and Performance Evaluation of Service Overlay Networks Topologies”, authored by Davide Adami, Christian Callegari, Stefano Giordano, Gianfranco Nencioni and Michele Pagano, the topology design problem of a Service Overlay Network is addressed from a performance point of view, taking into account both the traffic demand and the overhead. The performance of a limited set of well-known topologies is investigated. Additionally, three new traffic demand-aware overlay topologies are proposed based on heuristics, which are also evaluated through extensive simulations.The fourth paper is “An empirical Evaluation of Multi-Step Prediction Performance”, by Mohamed Faten Zhani, Halima Elbiaze and Farouk Kamoun. In this paper, the authors perform an analysis of Multi-step Internet traffic prediction performance of the ARIMA (AutoRegressive Integrated Moving Average) and the LMMSE (linear minimum mean square error) models. Two multi-step prediction techniques are compared: the Iterating Multi-Step technique (IMS) and the Direct Multi-Step technique (DMS). The analysis is based on two sets of real Internet measurements.In the fifth paper, “A Visualization Tool for Exploring Multi-scale Network Traffic Anomalies”, by Romain Fontugne, Toshio Hirotsu and Kensuke Fukuda, an interactive tool is presented that takes advantage of several graphical representations highlighting the different aspects of network traffic and anomalies. The proposed tool, available at http://www.fukuda-lab.org/~romain/mulot/, allows for exploration of network traffic at any temporal and spatial (address and port) scales. The usefulness of this tool is verified by evaluating it using several traffic traces.The sixth paper, “Interference Reduction in Overlaid WCDMA and TDMA Systems”, by Maan A. S. Al-Adwany and Amin M. Abbosh, evaluates the performance of WCDMA uplink system for UMTS mobile communications and investigate the possibility of increasing mobile communication cell capacity through merging WCDMA and TDMA systems in one cell. An interference canceller is proposed to reduce, or even completely cancel, the interference between WCDMA and TDMA, hence enabling them to work together. This coexistence is proven to be possible via computer simulations.Finally, the seventh paper is: “GCAD: A novel Call Admission Control algorithm in IEEE 802.16 based Wireless Mesh Networks”, by Floriano De Rango, Andrea Malfitano and Salvatore Marano. In this paper, a new call admission control algorithm for 802.16 distributed mesh networks named GCAD-CAC (Greedy Choice with Bandwidth Availability aware Defragmentation) is proposed. The algorithm is characterized by an initial greedy choice, by a preemption and a defragmentation process. The performance of the proposed GCAD algorithm is evaluated in terms of throughput, average end-to-end delay, average delay jitter, number of refused requests and packet loss percentage. GCAD is also compared with another two CAC algorithms in literature, giving the best performance due to the presence of a defragmentation process.The guest editors would like to thank all the authors and reviewers for their valuable contributions to this special issue. We hope that the papers selected in this special issue will become useful resources for researchers and practitioners in the area of performance evaluation of communication networks and systems. |
| Publisher | ACADEMY PUBLISHER |
| Date | 2011-04-01 |
| Source | Journal of Networks Vol 6, No 4 (2011): Special Issue: Performance Evaluation of Communication Networks and Systems |
| Rights | Copyright © ACADEMY PUBLISHER - All Rights Reserved.To request permission, please check out URL: http://www.academypublisher.com/copyrightpermission.html. |