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  1. W. Zhou, Provision and Route Optimisation in DiffServ Networks, Master's Thesis, Networking Laboratory, Helsinki University of Technology, 2002 (link)(bib)
    Abstract: With the occurrence of new applications such as delay-sensitive real-time services, Quality of Service is becoming increasingly important in the Internet. DiffServ is motivated by the desire to improve the overall performance of IP networks. The performance and efficiency of the DiffServ architecture can be enhanced with perclass traffic engineering.\ This master’s thesis examines the issues of provision in DiffServ networks and a perclass routing approach (PERD). Traffic of different classes can be distributed in accordance with network state and QoS requirements in provisioned networks. The first part introduces some of the theory and literature related to the topic. The DiffServ architecture and end-to–end QoS are presented. In addition, provision and link sharing are described and discussed.\ In the second part, we discuss the traffic engineering based on a per-class approach which we call PERD. With the help of the QRS simulator, we analyzed performance of networks under different routing algorithms. As results, we found that PERD can improve throughput and reduce end-to-end delay of the EF class service as well as lower priority classes. Under the same conditions, we find that the cost with PERD does not increase much compared to the widest bandwidth algorithm.