Abstract:The Differentiated Service Architecture (DiffServ) is currently a popular research topic as a lowcost method to provide Quality of Service to the different applications in the Internet. This paper addresses the definition and deployment of specific network services in a DiffServ environment. The proposed network services are described, while our main focus is the real-time delay-sensitive applications such as voice and video.The corresponding services for those applications are further analyzed and simulated. The analysis includes the influence of different algorithms that could implement the corresponding services for voice and video as well as the QoS performance under these algorithms. Sim ulation outcomes prove that the fundamental principles of the network services are fulfilled and provide an evaluation of the proposed algorithms.

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The Differentiated Services (DiffServ) architecture has been proposed as a scalable solution for providing service differentiation among flows. Towards the enhancement of this architecture, new mechanisms for admission control and a new set of network services are proposed in this paper. Each network service is appropriate for a specific type of traffic and is realized through its own network mechanisms, which are the Traffic Classes. Traffic Classes provide the traffic handling mechanisms for each Network Service and are composed of a set of admission control rules, a set of traffic conditioning rules and a per-hop behavior (PHB). Different traffic-handling mechanisms are proposed for each network service and are implemented with the use of the OPNET simulation tool. A large-scale network is used as a reference topology for studying the performance and effectiveness of the proposed services.

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