A framework for providing differentiated QoS guarantees in IP-based network (original) (raw)
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The paper describes the traffic handling mechanisms implemented In the AQUILA pilot QoS IP network [10]. The AQUILA project enhances The DiffServ architecture concept [1,2,3] by adding new functionality for Admission control and resource management as well as by defining new set of network services. Each network service is optimised for specific type of traffic (e.g. non-reactive and reactive) and has its own traffic handling mechanisms. Exemplary measurement results verifying the effectiveness of AQUILA approach for providing QoS are also included.
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The Differentiated Services (DiffServ) architecture has been proposed as a scalable solution for providing service differentiation among flows. Towards the enhancement of this architecture, new mechanisms for admission control and a new set of network services are proposed in this paper. Each network service is appropriate for a specific type of traffic and is realized through its own network mechanisms, which are the Traffic Classes. Traffic Classes provide the traffic handling mechanisms for each Network Service and are composed of a set of admissio n control rules, a set of traffic conditioning rules and a per-hop behavior (PHB). Different traffic-handling mechanisms are proposed for each network service and are implemented with the use of the OPNET simulation tool. A large-scale network is used as a reference topology for studying the performance and effectiveness of the proposed services.
Journal of telecommunications and information technology, 2011
This paper shortly describes the IP QoS System which offers strict quality of service (QoS) guarantees in IPbased networks and supports a number of, so called, classes of services. Such solution requires to implement in the network a set of QoS mechanisms and algorithm working on packet, connection request and provisioning levels. Furthermore, we require signaling system for informing the network about new connection request and network resource allocation capabilities for providing required resources to given connection. The IP QoS System is based on the next generation networks (NGN) and differentiated services (DiffServ) architectures and, at least for now, it is designed for single domain only. Keywords—classes of service, DiffServ, multi-service networks, NGN, quality of service.
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Abstract This paper presents a simulation study of router mechanisms to provide differentiated levels of service to traffic with diverse performance requirements in IP networks. The paper focuses on queue management mechanisms and on Quality of Service routing. The performance of the Random Early detection dropper associated with the Weighted Round Robin scheduling discipline is compared with the Dynamic Degradation Distribution system.
The IP QoS System, Journal of Telecommunications and Information Technology, 2011, nr 3
This paper shortly describes the IP QoS System which offers strict quality of service (QoS) guarantees in IP-based networks and supports a number of, so called, classes of services. Such solution requires to implement in the network a set of QoS mechanisms and algorithm working on packet, connection request and provisioning levels. Furthermore, we require signaling system for informing the network about new connection request and network resource allocation capabilities for providing required resources to given connection. The IP QoS System is based on the next generation networks (NGN) and differentiated services (DiffServ) architectures and, at least for now, it is designed for single domainonly
QoS Support, Adaptive Queuing for Differentiating Services in IP Based Networks
With the increases in different types of applications and their various requirements it seems necessary to supplement the Internet with some techniques, which are able to classify services based on their characteristics. A new queuing discipline named QoS support, adaptive queuing is proposed in this paper, which aims to differentiate services in IP based networks. The proposed queuing paradigm differentiates services based on their parameters and improves fairness among flows, while stays stable at the same time. It also considers delay sensitive packets' requirements in order to meet their needs. The proposed queuing scheme also improves the goodput of the system and services more users. Furthermore, the algorithm has got the ability of adapting itself to the changes in the network. The provided results, which are very promising, confirm that the algorithm has reached its goals.
Admission control for providing QoS in DiffServ IP networks: the TEQUILA approach
IEEE Communications Magazine, 2003
Admission control is a key component for QoS delivery in IP networks because it determines the extent to which network resources are utilized and whether the contracted QoS characteristics are actually delivered. Unlike most of the existing approaches, we adopt a holistic view and position the admission control in a unified architecture, where traffic engineering and service management interact in different levels of abstraction and timescale. Distinguishing between service subscription and invocation epochs, the applied admission logic is based on a feedback model, the operation of which can be tuned by operational policies and business strategies. The validity of the approach is supported by a scalability analysis while it has also been verified by a prototype system.
Int'l J. of Communications, Network and System Sciences, 2009
The study of Quality of Service (QoS) has become of great importance since the Internet is used to support a wide variety of new services and applications with its legacy structure. Current Internet architecture is based on the Best Effort (BE) model, which attempts to deliver all traffic as soon as possible within the limits of its abilities, but without any guarantee about throughput, delay, packet loss, etc. We develop a three-layer policy based architecture which can be deployed to control network resources intelligently and support QoS sensitive applications such as real-time voice and video streams along with standard applications in the Internet. In order to achieve selected QoS parameter values (e.g. loss, delay and PDV) within the bounds set through SLAs for high priority voice traffic in the Internet, we used traffic engineering techniques and policy based routing supported by Border Gateway Protocol (BGP). Use of prototype and simulations validates functionality of our architecture.
Quality of service management in IP networks
Proceedings of the 7th International Conference on Telecommunications, 2003. ConTEL 2003., 2003
The DiffServ architecture provides a scalable mechanism for QoS introduction in an IP network. The idea of DiffServ is based on the aggregation of traffic flows at an ingress (or egress) point of a network and IP packet marking for different priority flows, according to several classification criteria. In this paper the problem of the improvement and fairness of absolute QoS provisioning to paths established along a DiffServ network on a per router basis is considered. The service rate reconfiguration problem of a router's output link is formally defined, mathematically formulated and solved by means of efficient heuristic algorithms, providing good solutions in reasonable time. Finally, an indicative set of results is provided and concluding remarks are made.