Concevoir pour l'ordonnancement temps réel. Prise en compte de l'ordonnancement temps réel durant la phase de conception d'une radio logicielle

National audienceThe rapid changes in embedded electronics these recent years are the result of permanent improvements of design methodologies in adequacy with constraints that support the application. In Software Defined Radio field, the electronic system has the property of being "Real-Time" because it must respond within a specific time interval, known in advance. The growing need for software radio equipment with the ability to automatically adapt to the environment in which it is located, leads to the simultaneous execution of a large number of software components on a single processor in future broadband software radio. Consequently, these radios equipments become highly time constrained. From this perspective, current design methodologies for software radio integrating real-time scheduling analysis cannot be applied. This paper presents a new MDE (Model Driven Engineering) design methodology, allowing specifying parameters, which make possible real-time scheduling analysis of software components executing on a uniprocessor in a software radio. Also, we propose an algorithm, implemented as a tool, which simulates real-time scheduling of tasks implementing flexible signal processing algorithms. This tool is integrated to the proposed design methodology. Finally, we present an experiment of our methods on a project to demonstrate the benefits of our methodology and the good accuracy of our tool