| Summary: | 碩士 === 國立交通大學 === 電信工程系 === 88 === More and more network users are demanding QoS services for various reasons and objectives. Depending on the service requirements, different classes of service with different degrees of QoS guarantees may be required. In recent years, many QoS routing mechanism had been proposed for providing QoS services in high-speed packet networks. However, to the best of author’s knowledge, none of them take the traffic mixing states of traffic flows of various service classes into account for selecting a route for a particular QoS traffic flow. In this paper, we firstly present the potential unfairness problem among the traffic flows of the same service class traversing different paths with different states of traffic mixture. Then, we propose a new QoS routing and forwarding mechanism, called “Service Balanced QoS Routing and Forwarding” (SBQR) mechanism, which takes the traffic mixing states of links into account to determine a QoS path for a particular QoS flow. Simulation results show that this new mechanism does improve the unfairness problems of traffic flows belonging to the same service class. Lastly, an extension to SBQR (SBQR+) is proposed to provide a means to find a path with assured end-to-end delay performance for a QoS traffic flow.
|
|---|
