A new architecture of providing end-to-end quality-of-service for Differentiated Services network

This paper focuses on providing end-to-end multiple quality of service (QoS) in the Differentiated Services (DiffServ) network, including guaranteed services, assured services and best-effort services. We propose a new architecture that can not only provide coarse grain QoS, but also guarantee end-to-end QoS for premium service without per-flow state management at core routers under the DiffServ architecture. In order to accomplish it, we develop a signaling protocol to help to select the route satisfying the end-to-end QoS requirements and reserve resources for each the flow when a session is initiated. A new mechanism is proposed to make packets of each flow keep the same route. Meanwhile packets belonging to the other classes of service are still in normal DiffServ. Bandwidth broker (BB) is introduced to allocate the resources in an autonomous domain and between them. We also give a simple discussion of our architecture and some consideration of the decentralized implementation of BB.