As the DiffServ architecture is gaining ground, traffic engineering requires major adjustments. In addition, the measurement-based strategy has been widely adopted owing to its advantages of flexibility and easy adaptation. This article reviews measurement-based dropping schemes. Based on the definition and investigation of the “packet shortage” phenomenon, an enhanced dropping scheme for the p...

By developing the new services such as VoIP and Videoconference, using a mechanism is needed to support the quality of service of the application programs. Different models have been presented to guarantee the quality of service. Among these, the differentiated services can be mentioned which was presented by IETF. In the architecture of the differentiated services, no admission control mechani...

We propose and analyze a methodology for providing absolute differentiated services with statistical performance guarantees for real-time applications in networks that use class-based (as opposed to flow-aware) staticpriority schedulers. We develop a method that can be used to derive statistical delay guarantees in a flow-unaware fashion. Traditionally, both deterministic and statistical delay ...

In this paper, we proposed a DiffServ based multicast media gateway, which is called Adaptive Differentiated Service Multicast Gateway (ADMG), to achieve the QoS guarantee and scalability considerations for multimedia presentation systems. The purpose of the ADMG system is twofold: (1) improve the bandwidth utilization by doing bandwidth reservation based on the layered-media aggregation and (2...

Network quality of service is traditionally thought to be provided by a combination of scheduling in the network nodes to enforce a capacity sharing policy and traffic controls to prevent congestion that could annihilate that policy. The work presented herein is instead based on an end-to-end argument: A capacity sharing policy is enforced by traffic controls in the hosts at the edges of the ne...

The world of telecommunications continues to provide radical technologies. Offering the benefits of a superior television experience at reduced long-term costs, IPTV is the newest offering. Deployments, however, are slow to be rolled out; the hardware and software support necessary is not uniformly available. This paper examines the challenges in providing IPTV services and the limitations in d...

Recent Linux kernels ooer a wide variety of traac control functions, which can be combined in a modular way. We have designed support for Diierentiated Services based on the existing traac control elements, and we have implemented new components where necessary. In this document we give a brief overview of the structure of Linux traac control, and we describe our prototype implementation in mor...

Voice over IP and other jitter sensitive applications have raised the demand for Quality of Service guarantees in the Internet. The traffic must be classified and prioritized according to application specific needs. The Differentiated Services framework provides means for stateless low-cost classification. This paper summarizes the IETF's DiffServ Internet Draft.

1 Problem statement The experiments described in this report address the problem of Quality of Service (QoS) support in IP networks. Experiments focus on the Differentiated Services (diffserv) QoS architecture specified in RFC 2475. The Diffserv architecture is based on the idea of classifying IP flows into aggregates and differentiating the service given to the aggregates rather than to flows ...