Research On Key Technologies Of Differentiated Management For Multi-services Based On Flow-aware Networking

Triple Play is the goal of network technology development. The future network based on Triple Play will be an open integrated infrastructure based on packet switching technology. Different services require different quality of service, and it becomes a key challenge for the future network to provide different quality of service guarantee for different service. Flow-Aware Networking, based on integrated service concepts and differentiated service policies, can achieve differentiated service guarantee for multi-service flows by integrating the admission control and scheduling policy.This thesis includes all researching work relying on a National 863 special issue of the 11th Five-Year plan named―The Researching and Manufacture of Reconfigurable Router Components‖. Researching the key technologies of differentiated management for multi-services based on the theory of Flow-Aware Networking, the thesis proposes a differentiated service management system model for multi-services, and then presents a differentiated admission probability based flow-aware admission control algorithm and a dynamic priority deficit round robin scheduling algorithm for the system design requirements.The main work and contributions of this thesis are outlined as follows:1. A differentiated management model for multi-services is proposed. The component and function of system is described, and the functional design requirements are analyzed. By drawing on the experience of multi-service flow processing in Flow-Aware Networking, the system consists of components of flow-awareness, admission control and queue scheduling, achieves traffic differentiation, different access control and different forwarding for multi-services respectively.2. A differentiated admission probability based flow-aware admission control algorithm named DAPFAC is proposed to smooth and restrain the random congestion of link which might occur in the existing flow-aware admission control strategy. Based on the service differentiating, DAPFAC accepts a new traffic with different admission probability and adjusts the probability dynamically by associating the congestion state index of each kind of traffic. The analysis of performance and the results of simulation show that DAPFAC could guarantee the basic throughput for the ongoing traffic under the heavy load.3. A dynamic priority deficit round robin scheduling algorithm named DPDRR is proposed to solve the unfairness of multi-service flow scheduling which affected the link efficiency. DPDRR adjusts the forwarding priority of streaming flows dynamically between absolute priority and relative priority according to the priority load state. The algorithm emphasizes the relative fairness of scheduling under the light load, and gives streaming flows the absolute priority of forwarding under the heavy load for their delay performance. The results of simulation show that DPDRR could improve the fairness of multi-service flow scheduling and the link efficiency effectively.