The transfer of digital video will be a crucial component of the design of future home networking applications. This transfer was made feasible by the advancement of digital video encoding techniques that reduced the bandwidth required for this transfer to a practical level. MPEG4 is an encoding technique that is suitable for home networking applications with its low bit rate. It also has the advantage that allows viewers to interact with encoded objects. In this paper, we present our work that enables the study of MPEG4 properties and performance on the Internet using simulation. We propose a traffic generator that is able to generate traffic that has almost the same first and second order statistics as an original trace of MPEG4 frames that is generated using an MPEG4 encoder. We model and generate this traffic based on the Transform Expand Sample (TES) methodology using TEStool. We present the model and show the performance of the generator in terms of good matching of the characteristics of the modeled trace.

Abstract-This paper1 outlines an optimal dynamic wavelength allocation in all-optical WDM networks. A simple topology consists of a 2-hop path network with three nodes is studied for three classes of traffic where each class corresponds to different source-destination pair. For each class, call interarrival and holding times are exponentially distributed. The objective is to determine a wavelength allocation policy in order to maximize the weighted sum of users of all classes. Consequently, this method is able to provide differentiated services in the network. The problem can be formulated as a Markov Decision Process to compute the optimal resource allocation policy. It has been shown numerically that for two and three classes of users, the optimal policy is of threshold type and monotonic. Simulation results compare the performance of the optimal policy, with that of Complete Sharing and Complete Partitioning policies.

Abstract-In this paper, we present a study of layered video fairness on IP networks. Our study is based on simulation. We investigate some issues that have direct impact on fair allocation of bandwidth between layered video and TCP, in particular: a) Congestion control mechanisms employed by layered video transfer protocols. For this part we studied the interaction of RLM with TCP. b) The effect of the distribution of video traffic across layers in layered multicast video. c) The effect of VBR video on fairness to TCP. We show that fairness is affected by all the above factors. We also show that fairness of layered video comes at the expense of instability of the video quality and poor link utilization. We conclude by discussing the performance of layered video protocols in general and recommendations on the design of video transfer systems on IP networks.

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Abstract-We investigate1 a Call Admission Control (CAC) mechanism to provide service differentiation and fairness control in a WDM network with grooming capabilities. A WDM grooming network can handle different classes of traffic streams which differ by their bandwidth requirements. We assume that for each class, call interarrival and holding times are exponentially distributed. Using a Markov Decision Process approach, an optimal CAC policy is derived to provide service differentiation in the network. The Policy Iteration algorithm is used to numerically compute the optimal policy. Furthermore, we propose a heuristic decomposition algorithm with lower computational complexity and very good performance. Simulation results compare the performance of our proposed policy, with that of Complete Sharing and Complete Partitioning policies.