To achieve some level of QoS (quality of service) assurance, DiffServ (Differentiated Services) domains have SLAs (service level agreements) with their users and neighboring domains, which describe the QoS level the service provider is committed to provide and the amount of traffic users or neighboring domains are allowed to send. All incoming flows must conform to certain pre-determined SLA wi...

Abstrncr . Admission eontml is a critical element for supporting Quality-of-Service in networks. We pmpase and evaluate the performance of an adaptive inadmission contml scheme that is suitable for use in a Differentiated Services Internet backbone. The pmposed scheme impmves upon the admission cuotml scheme by measur. ing the maximal arrival rate envelope at an ingress node and adding an adapt...

The Differentiated Services approach is currently intensively discussed in the Internet community. It will also bring benefits for multicast applications that need quality of service support. For instance, a highly reliable multicast can be provided based on Expedited Forwarding. However, current efforts mainly concentrate on unicast services, whereas multicast services have not been addressed ...

The goal of this paper is to study pricing of differentiated services and its impact on the choice of service priority at equilibrium. We consider both TCP connections as well as non controlled (real time) connections. The performance measures (such as throughput and loss rates) are determined according to the operational parameters of a RED (Random Early Discard) buffer management. The latter ...

This memo describes several Rate Adaptive Shapers (RAS) that can be used in combination with the single rate Three Color Markers (srTCM) and the two rate Three Color Marker (trTCM) described in RFC2697 and RFC2698, respectively. These RAS improve the performance of TCP when a TCM is used at the ingress of a diffserv network by reducing the burstiness of the traffic. With TCP traffic, this reduc...

We present an adaptive controlled scheduler for heterogeneous applications running on general purpose computers. Our scheduler can effectively support diverse application requirements. It employs uniform rate-based sharing. Application heterogeneity is satisfied by partitioning CPU capacity into service classes, each with a different criterion for admission control. As a result, we are able to ...

Architecting networks capable of providing scalable, efficient, and fair services to users with diverse QoS requirements is a challenging problem. The differentiated services framework has advanced a set of building blocks comprised of per-hop and access point behaviors with the aim of facilitating scalable services through aggregate-flow control inside the network and per-flow traffic control ...

Abstract: We consider packet-based networks that use the Differentiated Services (DiffServ), where we model DiffServ as a priority service. Users are free to choose the priority that they attach to their packets and are charged accordingly, where high priority packets are more expensive than low priority packets. For this service, one would expect that users will allocate priorities to their tr...

The demanding quality of service needs of research, education and commercial network service providers require new services in current “best-effort” Internet architecture. The Internet must enable applications that demand specific services to profit from a set of differentiated traffic classes, which support either relative or absolute types of quality of service, or both. This diploma thesis f...

Recent work on differentiated services in the Internet has defined new notions of Quality of Service (QoS) that apply to aggregates of traffic in networks with coarse spatial granularity. Most proposals for differentiated services involve traffic control algorithms for aggregate service levels, packet marking and policing, and preferential treatment of marked packets in the network core. The is...