The IP QoS System, Journal of Telecommunications and Information Technology, 2011, nr 3 (original) (raw)
Related papers
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.
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.
On Providing End-To-End QoS Introducing a Set of Network Services in Large-Scale IP Networks
Lecture Notes in Computer Science, 2002
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.
Advanced QoS provisioning in IP networks: the European premium IP projects
IEEE Communications Magazine, 2003
This article describes the current evolution of QoS architectures, mechanisms, and protocols in the Internet, as it is ongoing in the framework of the European Union funded research projects on premium IP networks. A short review of the proposed standard approaches to QoS (e.g., differentiated services, integrated services, and label switching technologies) is given. Then we focus on the state-of-the-art architectures, mainly based on DiffServ concepts. Several issues arise when trying to implement these architectures in the real world: QoS aspects, network monitoring of the offered QoS, and end-user control of received QoS. The article then discusses the existing results and the current direction of European research and development in these areas.
Network Services Deployment for QoS provisioning in a multi-layer DiffServ Architecture
The Internet evolution delineated during the last years has necessitated the need of quality of service differentiation among IP flows that expose different characteristics regarding bandwidth, delay, packet loss, and other QoS-relative parameters. This paper describes in brief the specification and implementation of a layered architecture, which achieves the aforementioned requirements through the definition of specific modules that cater for all the aspects of quality: user-oriented reservations, selection of the appropriate traffic class, admission control, router setup, resource management and measurements. The main innovative feature of the architecture is the definition of the Resource Control Layer that resembles a distributed Bandwidth Broker and offers a feasible way to implement admission control at the edges and manage the resources of the network. The paper focuses on the definition of specific Network Services targeting different kinds of applications. They are implemented within the network through the appropriate Traffic Classes, which properly set various parameters of the network routers.
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.
Performance evaluation of signaling in the IP QoS system
The IP QoS System is based on next generation networks (NGN) and differentiated services (DiffServ) architectures. Its main part is a signaling system, which allows to send a request from a user to the system for establishing new connection with predefined quality of service assurance. In this paper we present trial results of the proposed signalling system. The experiments were performed to measure setup delay utilizing artificial call generator/analyzer. To obtain results we assumed different distributions of interarrival and call holding times based on the literature. The results show that the setup delay strongly depends on access time to network devices, however also on the assumed call holding time models.
Quality of service support in differentiated services packet networks
ICC 2001. IEEE International Conference on Communications. Conference Record (Cat. No.01CH37240), 2001
Ah.srmcr-During the past few years, new types of Internet applications which require performance beyond the best-effort service that is provided by the current Internet have emerged. These applications include the transmission of voice and video, which require a fixed end-tosnd delay bound in order for the end-user to perceive an acceptable level of service quality. The Differentiated Services (Diffserv) model has been proposed recently to enhance the traditional best-effort service, and provide certain Quality of Service (QoS) guarantees to these applications. Its current definition, however, does not allow for a high level of flexibility or assurance and, therefore, it can not be widely deployed. I n this paper, we introduce a new protocol for a Diffserv architecture which provides a simple and efficient solution to the above problem. I t is a complete protocol, in the sense that it deals with the issues of packet scheduling, admission control, and congestion control. We will show, through experimental results, that our proposed protocol can improve the flexibility and assurance provided by current solutions, while maintaining a high level of network utilization.