Abstract-In this paper, design alternatives for supporting realtime traffic in a differentiated services IP network node are studied. A scheduling algorithm called weighted earliest due date (WEDD) is proposed that provides tunable delay differentiation for applications like video or voice over IP. WEDD enhances the earliest due date (EDD) scheduling mechanism in such a way that not only different delay bounds but also different deadline violation probabilities are provided. The ratios of violation probabilities in different classes are easily specified by a set of parameters. Simulation studies are performed to show that the scheduler is able to maintain the specified ratios under various traffic conditions in short as well as in long time scales.
This paper presents and evaluates the new Weighted Integrated Routing scheme to solve the problem of dynamic routing and traffic grooming in meshed SDH/SONET-WDM multilayer networks. Its performance is compared to non-integrated schemes using a cost model.
An important issue in the design of multi-service IP networks is to find appropriate mechanisms to provide different levels of quality of service (QoS) for different types of applications. In this paper, scheduling mechanisms for real-time traffic in a differentiated services IP network are studied. A new scheduling algorithm called weighted earliest due date (WEDD) is proposed that provides tunable delay differentiation for real-time applications like voice over IP. WEDD is an enhancement of the earliest due date (EDD) scheduler in the sense that not only different deadlines but also different deadline violation probabilities are provided. The ratios of the violation probabilities are directly defined by a set of parameters. Simulation studies are performed to show that the scheduler is able to maintain the specified ratios under various load conditions.
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