Composing and decomposing QoS attributes for distributed real-time systems experience to date and hard problems going forward

Abstract

Distributed real-time embedded (DRE) systems combine the stringent quality of service (QoS) requirements of embedded systems and the dynamic conditions of distributed systems. In these DRE systems, QoS requirements are often critical, and QoS must be managed end-to-end, from the mission layer down to the resource layer, across competing applications, and dynamically as conditions change. In this paper, we discuss issues in providing QoS management in DRE systems and some middleware- and componentbased solutions that we have developed to enable QoS management. We illustrate these in the context of a live flight demonstration of DRE systems, discuss the experience gained from the application of the technology to this context, and discuss some future directions for further research. © Springer-Verlag Berlin Heidelberg 2007.