quality of service (qos) refers to a set of rules or techniques that help the network administrators use the available network resources optimally to manage the effects of congestion and to treat the applications according to their needs. the differentiated services architecture (diffserv) allows providing quality of service to users. the major diffserv premise is that individual flows with sim...

Recent results on the proportional di erentiation model show that waiting time priority scheduling can be applied to implement proportional delay di erentiatied services reasonably well under limited conditions. While earlier research focused on heavy load conditions only, more recent results provide insights into waiting time priority scheduling under moderate load conditions also, but the app...

This paper studies the design and performance of the Probabilistic Priority (PP) [5] packet scheduling algorithm to schedule packets. Unlike an earlier design that uses fractional arithmetic and prohibits large number of classes, we present an integer PP algorithm and show that PP turns out to be a special scheme of applying lottery scheduling [10] to bandwidth allocation in a strict priority s...

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...

The relative diierentiation architecture does not require per-ow state at the network core or edges, nor admission control, but it can only provide higher classes with better service than lower classes. A central premise in the relative diierentiation architecture is that users with an absolute QoS requirement can dynamically search for a class which provides the desired QoS level. In the rst p...

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 ...