The proportional diierentiation model provides the network operator with thètuning knobs' for adjusting the per-hop QoS ratios between classes, independent of the class loads. This paper applies the proportional model in the diierentiation of queueing delays, and investigates appropriate packet scheduling mechanisms. The second part of this work 2] considers the corresponding loss rate diierent...

The paper shows that the digital proportional-integral-plus (PIP) controller formulated within the context of non-minimum state space (NMSS) control system design methodology is directly equivalent, under certain non-restrictive pole assignment conditions, to the equivalent digital Smith predictor (SP) control system for time delay systems. This allows SP controllers to be considered within the...

Four di erent CMOS inverter delay models are derived and compared. It is shown that inverter delay can be estimated with fair accuracy over a wide range of input rise times and loads as the sum of two terms, one proportional to the input rise time, and one proportional to the capacitive load. Methods for estimating device capacitance from HSPICE parameters are presented, as well as means of inc...

The DiffServ architecture provides a scalable mechanism for QoS introduction in a TCP/IP network. The idea of DiffServ is based on the aggregation of traffic flows at an ingress (or egress) point of a network and the IP packet marking for different priority flows, according to several classification criteria. Two approaches exist in the DiffServ architecture: the absolute and the relative. In a...

Due to the open and dynamics nature of ubiquitous computing environments and services, quantitative service differentiation is needed to provide controllable quality of service (QoS) levels to meet changing system configuration and resource availability and to satisfy different requirements of applications and users. A proportional differentiation model was proposed in the DiffServ context, whi...

In this paper, we consider a proportional delay model for Internet differentiated services. Under this model, an ISP can control the “spacing” of waiting times between different classes of traffic. Specifically, the ISP tries to ensure that the average waiting time of class traffic relative to that of class traffic is consistently a specifiable ratio. If the ratio is less than one, the ISP can ...

Proportional service differentiation models are simple and effective approaches to service differentiation in Internet. Schedulers for delay differentiation are important elements of these models. We describe a new scheduler for proportional delay differentiation called BPR+: Optimized BacklogProportional Rate scheduler. BPR considers waiting times of packets that are backlogged in queues in or...

Proportional service differentiation models are simple and effective approaches to service differentiation in Internet. Schedulers for delay differentiation are important elements of these models. We describe a new scheduler for proportional delay differentiation called BPR: Optimized BacklogProportional Rate scheduler. BPR considers waiting times of packets that are backlogged in queues in ord...

Multihop networks must pass messages between source and destination nodes via intermediate links and nodes. Assuming propagation delay is ignored, the mean amount of time the average message stays in a multihop network is directly proportional to the mean distance, in hops, between nodes. Thus, the aggregate link capacity of the network is also directly proportional to this "mean internodal dis...

This paper first introduces bandwidth utilization metric and then analyzes sorted-priority schedulers in the terms of the metric. The results show that the utilization is directly proportional to both the number of delay bound classes and the dependency of delay bound on rate but inversely proportional to packet size.