This paper provides the first exact analysis of a preemptive M/M/c queue with two priority classes having different service rates. To perform our analysis, we introduce a new technique to reduce the 2-dimensionally (2D) infinite Markov Chain (MC), representing the two class state space, into a 1-dimensionally (1D) infinite MC, from which the Generating Function (GF) of the number of low-priorit...

We investigate a photonic packet switch architecture that enables a high node throughput and provides priority services. We describe PBSO (partial buffer sharing with overwriting) method that allows control of an optical fiber-delay-line buffer by prioritized buffer management under conditions of synchronous arrival of fixed length optical packets at a packet switch. The PBSO method is based on...

Pre-detection mechanisms are often used to ensure the users’ QoE on mobile devices before potential service/application malfunctions really occur. In order to improve the efficiency of pre-detection, an optimized detection mechanism is proposed. In the mechanism, a priority set of services is selected by considering user’s dependency degree on services, service’s priority and network load. Firs...

Abstract The good of those who are worse off matters more to the overall than better does. But being one’s fellows is not itself bad; nor inequality do differences in well-being matter when lower an absolute sense. Instead, relatively worse-off weighs heavily better-off does, virtue fact that former off. This paper articulates and defends view just described.

In this paper we address the issue of efficient multimedia communication by integrating an intelligent buffer management with the congestion control scheme at the source. The scheme rewards multiple priority levels in encoded video and fact that most of the transmission losses actually occur at the source control. The integrated system uses priority information from the encoder and network info...

This paper considers a Markovian model of a service system motivated by communication and information services. The system has finite processing capacity and offers multiple grades of service. The highest priority users receive a “guaranteed” processing rate, while lower priority users share residual capacity according to their priority level and therefore may experience service degradation (he...