Framework for parameter mapping to provide end-to-end QoS guarantees in IntServ/DiffServ architectures

With the numerous emerging real-time and multimedia applications, there has been much interest for developing mechanisms which enable real-time services over the Internet. These applications have QoS requirements. From the end-user's point of view, QoS should be supported end-to-end between any pair of hosts; so all elements along the path must participate in special treatment for packets to provide the required QoS. One of the promising configurations to support real-time traffics is by combining capabilities of IntServ and DiffServ architectures. However, guaranteeing end-to-end QoS over such architectures-generally composed of chains of multiple independently administered IntServ and DiffServ domains-requires the deployment of several mechanisms and many untaken steps remain on the road to achieving this. In particular, multiple networks (domains), forming a region, may consider different QoS parameters and/or manage them differently. In this paper, we deal with the problem of mapping QoS parameters and establish conditions for the guarantee of end-to-end QoS. A (generic) framework is proposed to easy the analysis of QoS mapping between Internet domains. functions are proposed to contribute to the definition of a formal system for reasoning on QoS requirements and on the relationships between QoS requirements and Service Level Specification.