Quality of service terminology in IP networks (original) (raw)

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

The IP QoS System

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.

Network quality of service : know it all

2009

Click here if your download doesn"t start automatically Network Quality of Service Know it All Network Quality of Service Know it All The term Quality of Service, abbreviated QoS, refers to network resource control mechanisms. Quality of Service is the ability to provide different priority to different applications, users, or data flows, or to guarantee a certain level of performance to a data flow. This book brings all of the elements of network quality of service (QoS) together in a single volume, saving the reader the time and expense of making multiple purchases. It introduces network QoS, explains the basics, describes the protocols, and discusses advanced topics, by the best and brightest experts in the field. It is a quick and efficient way to bring valuable content together from leading experts in the field while creating a one-stop-shopping opportunity for customers to receive the information they would otherwise need to round up from separate sources.

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.

Quality of Service Mechanisms and Challenges for IP Networks

2006

In the past decade, Quality of Service (QoS) parameters have posed great challenges for Network Operators. This is partly because of the growth in network varied traffic demands. The Internet is a besteffort technology, and therefore, not optimized for the transport of delay sensitive services. Real time voice, video, and some applications, such as multimedia applications, video streaming, etc. have placed increasing demands on networks, straining their ability to provide customers with good quality services. An attempt to address this problem has resulted in numerous mechanisms for providing quality of service networks. The ultimate goal of these mechanisms is to provide improved network service to the applications at the edges of the network. This paper reviews advances in QoS mechanisms and recommends how they can be integrated and implemented in order to take advantage of optimized network resources.

IP Networks Quality of Service: Overview and Open Issues

Lecture Notes in Computer Science, 2006

Mechanisms to provide Quality of Service (QoS) into Internet have a collection of aspects to consider improving network performance. However, this work focuses only on four of these aspects, as follows: Traffic Models, Queue scheduling, Congestion control and QoS routing. Considering any of the three above mentioned approaches, it is necessary the use of traffic models which capture the real network traffic behavior. This paper introduces some QoS concepts, as well as open-issues in the mentioned areas.

The QoSxlabel: a quality of service cross-layer label

INDIN '05. 2005 3rd IEEE International Conference on Industrial Informatics, 2005., 2005

In the context of multimedia and real-time communication, this paper introduces a standardized way for the packet QoS properties to be represented, in order to allow any of the underlying communication mechanisms to access and use these QoS properties. The QoSxLabel (Quality of Service Cross-layer Label) proposes a common syntax expressing the QoS properties. This label is not necessarily added as a new field in the packets but deduced from existing fields according to a well-defined set of rules. The use of the QoSxLabel by some of the mechanisms situated at different levels of the communication architecture will allow a fine optimization of the communication services regarding the real application data requirements.

A framework for providing differentiated QoS guarantees in IP-based network

Computer Communications, 2003

The paper describes the traffic handling mechanisms implemented in the AQUILA pilot QoS IP network [AQUILA Project Consortium (2001)]. The AQUILA architecture enhances the DiffServ concept [A Conceptual Model for DiffServ Routers (2000), An Architecture for Differentiated Services (1998), An Expedited Forwarding PHB (2001)] by adding new functionality for admission control and resource management as well as by defining new set of Network Services (NSs). Each NS is optimised for specific type of traffic (e.g. reactive and nonreactive) and has its own traffic handling mechanisms. The mentioned mechanisms operate at different time scales, ranging from longmedium term resources management (provisioning, resource pools) to flow level admission control, down to packet level scheduling and queuing management. Some of these mechanisms are related to NSs: in particular each NS is associated to a set of traffic handling algorithms at flow and packet level, collectively referred to as Traffic Classes (TCLs). This paper describes the set of traffic handling mechanisms defined in AQUILA, with a special focus on the implementation of TCLs, both at packet and flow level. In particular the scheduling/queuing and admission control schemes for each TCL are presented. Exemplary measurement results verifying the effectiveness of AQUILA approach for providing Quality of Service (QoS) guarantees and QoS differentiation are also included. q 2002 Published by Elsevier Science B.V.