An Analysis of Quality of Service Architectures

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.

Wireless networks have become the critical infrastructure that enables such applications as sensor networks, mobile personal computing devices, and avionics communication systems. As such, the security of these wireless networks has become an important research issue. Recent literature on wireless network security has focused on traditional security issues, such as encryption and authentication. Less attention has been paid to protecting the quality of service (QoS) assurances that guarantee that critical and important traffic will be routed preferentially through the network. In research that has studied QoS in the face of adversarial attacks, only specific layers of the network protocol stack have been evaluated. In this paper we argue that an integrated architecture for in-network protection of QoS assurances for each individual network traffic flow is essential to wireless network security.

2007

In this paper we investigate issues related to the integration of QoS capabilities in the framework of Internet technology. First, we take a brief look at the work undertaken by the IETF IntServ working group in order to de ne a reference model capable of providing new real-time multimedia applications, such as CSCW, telemedicine and distributed interactive simulation with the adequate quality of service. Then, we consider the architecture de ned by the Di serv working group, which implements scalable service di erentiation in the Internet by aggregating tra c classi cation state along a speci ed network path. Finally, we analyse issues concerning the interoperability between the two de ned approaches, considering them as complementary tools in the pursuit of end-to-end QoS. In this scenario, the main areas of research interest fall in the elds of tra c characterization, resource reservation and bandwidth optimisation. We touch upon all of these questions to give a state-of-the-art idea of current work and we try to give some hints concerning future developement trends in the Internet community.

Proceedings of the 6th …, 2000

With the exponential growth of the Internet, the demand for endto-end Quality of Service (QoS) guarantees has gained significant importance. Internet of the future will be characterized by applications right from voice, video to normal data. To provide a seamless integration of these applications into the Internet, we need to provide the right kind of QoS support at all types of environment. This paper evaluates on all the factors that govern Internet QoS. Highlighting all-important factors will then derive a unified approach when looking into the issue of QoS management in the Internet. The paper also reports on the ongoing work related to QoS in the Internet and discusses future directions.

2015

Regarding the dominance of IP applications and the requirement of providing quality of service for users, it is critical to provide an scalable network architecture capable of supporting sufficient Quality of Service (QoS). Of the two network models (Integrated Services and Differentiated Services) approved by the Internet Engineering Task Force (IETF) [1, 2], the differentiated service model has gained wider acceptance because of its scalability. Differentiated Services (DiffServ) QoS architecture is scalable but inadequate to deal with network congestion and unable to provide fairness among its traffic aggregates. Recently, IETF has recommended additional functions including admission control and resource discovery to enhance the original DiffServ [2]. In this thesis, we propose a new framework based on DiffServ. The new architecture, called Fair Intelligent Congestion Control DiffServ (FICC-DiffServ), applies the FICC algorithm and control loop to provide fairness among traffic aggregates and control congestion inside DiffServ networks. The augmented architecture is realisable within the existing IP network infrastructures. Simulation results show that the FICC-DiffServ performs excellently in terms of guaranteed fairness, minimised packet delay and jitter, as well as being robust to traffic attributes, and being simple to implement. Moreover, providing end-to-end QoS for Internet applications presents difficult problems, because the Internet is composed of many independently administrative domains called Autonomous Systems. Enabling end-to-end QoS, negotiations between domains is then crucial. As a means of negotiations, interautonomous system QoS routings play an important role in advertising the available network resources between domains. In this thesis, the Border Gateway Protocol (BGP) is extended to provide end-to-end QoS. The BGP is selected for two reasons: (1) BGP is an inter-domain routing protocol widely used on the Internet and (2) the use of attributes attached to routes makes BGP be a powerful and scalable inter-domain routing protocol.

Proceedings of ICIT, 2000

With the advent of high-end multimedia applications, the need to provide better Quality of Service (QoS) from the Internet has gained significant importance. Internet of the future will be characterized by diverse traffic sources -heavily overburdened by real time traffic right from voice to video and increasingly overwhelmed by the traffic generated through millions of e-commerce transactions. Therefore, QoS requirements of all such applications will introduce several new consequences along the way in which data is transmitted over the Internet. In this paper, we will attempt to evaluate all the issues that govern end-to-end Internet QoS. Highlighting all-important factors will then derive a unified approach for proper QoS management in the Internet. The paper also delves into the existing problems and describes means to maximize solutions towards better QoS from the Internet.

MILCOM 2002. Proceedings, 2002

Admission control of applications into each service class based on the bandwidth capacity allocated to each service class and its particular QoS objectives that sufficiently adapt to the dynamic state of the underlying network which could be a highly mobile ad-hoc network in a lossy wireless environment. In this paper, we discuss empirical, analytical and simulation-based performance studies for an integrated IP QoS architecture implementing QoS resource management over a heterogeneous wireless and wireline network. The intearated IP 00s architecture is based on Assured I-Forwarding (class-based) Differentiated Services and The very early design and implementation specifics of our admission control of individual flows into each service integrated IP QoS architecture are discussed in [5], [6]. class by a centralized server, called the Bandwidth Broker There have been significant modifications to the (BB) managing the network. The results we present in this architecture to support multi-class services and ad hoc paper are used as guidelines in designing the capacity wireless environments, which we will detail in an estimation algorithm for admission control and optimizing upcoming publication. QoS resource management within our integrated IP QoS architecture. These results serve as an instrument to understanding how to perform effective QoS resource management, using class-based differentiated services and admission control to guarantee class-appropriate end-toend QoS over IP networks.

Lecture Notes in Computer Science, 2003

The Differentiated Services (DiffServ) architecture offers a scalable alternative to provide Quality of Service (QoS) guarantees for performance-sensitive applications in the Internet. Within the DiffServ framework, efficient traffic scheduling mechanism is a key component to ensure such QoS guarantees. In this paper, scheduling algorithm called Enhanced Weighted Fair Queueing (EWFQ) is proposed that enables fair bandwidth sharing while supporting tight bounds on end-to-end delay for real-time traffic such as voice over IP (VoIP) in DiffServ networks. EWFQ allows to create service classes and assign proportional weights to such classes efficiently according to their resource requirements. The results from the simulation studies show that the mechanism is able to ensure both the required end-to-end delay bounds and bandwidth fairness based on the specified service weights. Besides, our scheme has lower implementation complexity, along with scalability to accommodate the growing traffic flows in the Internet backbone.