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The growth of the number of hosts connected to the Internet and of new applications increased the importance of research and development of Quality of Service (QoS)-based networks. In order to optimize the proposal and the validation of new QoS architectures and technologies, simulation seems to be the best solution when considering the deployment efforts, cost and scalability. Unfortunately, the existing platforms and tools for simulating QoS-based Networks either do not support all the architectures and technologies or do not fully support their characteristics. Basically, a simulation life-cycle can be divided into three phases: specification of the scenario, simulation of the events and analysis of the results of the simulation. This paper presents a platform for the specification of networks scenarios supporting QoS and multicast, which can be simulated using ns-2. This platform provides the author with the possibility of covering all the three phases of the simulation life-cycle on-the-fly.

During the last years Internet evolution demanded for new and richer applications. To fulfill the novel and more complex application requirements, new solutions in many domains were required. One of these domains is the network support, assuring, into some extend, a specific or predictable treatment to traffic; therefore, in this chapter, we present a broad view of the main efforts available on the literature in order to provide Quality of Service (QoS) in both wired networks and wireless sensor networks (WSNs). For this purpose, the authors present: (1) the more relevant QoS architectures and technologies along with some of its recent improvements; (2) the different perspectives that combine some of those architectures and technologies into more complex solutions, in order to achieve stronger QoS and/or performance; (3) the most relevant QoS issues in WSNs environments; and (4) through the comparison of the several solutions, they list the advantages and limitations and reveal some relations among the existing QoS solutions.