Analyse des interactions entre flux synchrones et flux asynchrones dans les réseaux temps réel

Abstract : Complex embedded systems (planes, satellites, drones ...) contain more and more calculators. From now on, these are tens or even hundreds of calculators that communicate through a shared network. A function is achieved by the collaboration of a set of devices that exchange a growing number of information. In an embedded real-time context, it must be ensured that these informations exchanged are correct but it must also be ensured that they verify their temporal constraints. From the network point of view, this means that informations must be exchanged respecting their deadlines. This implies being able to upper bound the traversal time of the network of each message in order to verify that it arrives in time. However, as embedded systems are more and more complex and as the amount of information exchanged is constantly increasing, this bound is increasingly difficult to compute. Furthermore, it is important that this upper bound to be the least pessimistic possible to avoid an oversized system. The goal of this work is to develop new methods of analysis in order to be able to compute these bounds. In order to achieve this, we used the Network Calculus method of analysis. This work focuses on the modeling of interactions between synchronous messages and asynchronous messages. The models presented in this work take into account the transmission dates on the network of synchronous messages when calculating the upper bounds of traversal time of the asynchronous messages. The main contributions are : 1. the presentation of a new way of considering the use of the dates of emission on the CAN bus : the weak synchronization. As well as the complete modeling of such a system and finally the evaluation of the gain provided by this solution. 2. a complete modeling of the TTEthernet network allowing to evaluate the impact of the synchronous flows on the traversal time of the asynchronous flows. 3. a presentation of the use of synchronization in the TSN network and a complete model for analyzing this new technology.
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Submitted on : Monday, July 22, 2019 - 9:55:28 AM
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Hugo Daigmorte. Analyse des interactions entre flux synchrones et flux asynchrones dans les réseaux temps réel. Sciences de l'ingénieur [physics]. UNIVERSITE DE TOULOUSE, 2019. Français. ⟨tel-02190134⟩



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