Quality-of-service management in IP networks

Quality of Service (QoS) in Internet Protocol (IF) Networks has been the subject of active research over the past two decades. Integrated Services (IntServ) and Differentiated Services (DiffServ) QoS architectures have emerged as proposed standards for resource allocation in IF Networks. These two QoS architectures support the need for multiple traffic queuing systems to allow for resource partitioning for heterogeneous applications making use of the networks. There have been a number of specifications or proposals for the number of traffic queuing classes (Class of Service (CoS)) that will support integrated services in IF Networks, but none has provided verification in the form of analytical or empirical investigation to prove that its specification or proposal will be optimum. Despite the existence of the two standard QoS architectures and the large volume of research work that has been carried out on IF QoS, its deployment still remains elusive in the Internet. This is not unconnected with the complexities associated with some aspects of the standard QoS architectures. [Continues.

Practical QoS Network System with Fault Tolerance

In this paper, we present an "emulation environment" for the design and planning of intranets. Intranets must support Quality-ofService (QoS) for real-time traffic and must be fault-tolerant for missioncritical applications such as tele-medicine. Our goal is to design the intranet as an overlay network within the IP network and to manage traffic in the intranet so that QoS requirements are satisfied. Routing is a key component of this architecture, in that it enables the efficient use of the provisioned bandwidth. Our approach is to make routers in the intranet capable of finding QoS paths in a distributed manner in response to changing traffic demands. As an extension of QoS routing, each router is able to compute multiple QoS paths to the same destination. The multiple QoS paths are utilized in parallel making the entire network system less prone to network failures. Our emulator permits us to design more reliable intranets and to test various applications for feasibility before deployment. This paper presents the emulation system architecture, the QoS algorithms used for fault tolerance and load balancing, and the relevant experiment results

Practical QoS network system with fault tolerance

In this paper, we present an `emulation environment' for the design and planning of QoS-enabled IP networks. Specifically, QoS support for real-time traffic in future IP networks require `fault tolerance' for mission-critical applications such as tele-medicine. Based on this premise, our goal is to design the QoS network system for the traffic management so that QoS requirements are satisfied. Routing is a key component of this architecture, in which it enables the efficient use of the provisioned bandwidth. Our approach is to make routers in the network capable of finding QoS paths in a distributed manner in response to changing traffic demands. As an extension of QoS routing, each router is able to compute `multiple QoS paths' to the same destination. The multiple QoS paths are utilized in parallel making the entire network system less prone to network failures. In computing multiple QoS paths, practical issues such as computation latency and resource requirement must be considered. With the use of multiple QoS paths, our emulation environment permits us to design more reliable QoS network systems and to test various applications for feasibility before deployment. This paper presents the multiple QoS algorithms with notable enhancements and the system architecture for fault tolerance. The relevant experiment results have also been presented