Michel Bourdelles

Events-Based Security Monitoring Using MMT Tool

MMT (Montimage Monitoring Tool) is a monitoring solution that combines: data capture, filtering and storage, events extraction, statistics collection, traffic analysis and reporting. In the context of the PIMI and DIAMONDS projects, Montimage is developing MMT-Security: a security analysis solution (part of MMT) that inspects network traffic against a set of security properties denoting both security rules and attacks. This tool has been applied to an industrial case study provided by Thales Group that consists of a QoS-aware ad-hoc radio communication protocol.

Extending schedulability tests of tree-shaped transactions for TDMA radio protocols

In this paper, a schedulability test is proposed for tree-shaped transactions with non-immediate tasks. A tree-shaped transaction is a group of precedence dependent tasks, partitioned on different processors, which may release several other tasks upon completion. When there are non-immediate tasks, tasks are not necessarily released immediately upon their predecessors completion. The schedulability test we propose is based on an existing test that does not handle non-immediate tasks directly. Simulation results show that tighter response time upper-bounds can be accessed when effects of non-immediateness are considered. Our schedulability test is motivated by real industrial TDMA systems developed at Thales, and experimental results show it provides less pessimistic schedulability results compared to current methods used by Thales system engineers.

Improving the design flow for parallel and heterogeneous architectures running real-time applications

In this article, we present the work-in-progress of the EU FP7 PHARAON project, started in September 2011. The first objective of the project is the development of new techniques and tools capable to guide and assist the designer in the development process, from UML specifications to implementation and debug on multicore platform. This tool chain will offer the possibility to propose and implement several parallelization strategies and drive the designer into implementation steps. The second objective of the project is to develop monitoring and control techniques in the middleware of the system capable to automatically adapt platform services to applications requirements and therefore reduce power consumption in a transparent manner for applications.

A task model for TDMA communications

In this article a new task model, called DGMF, is proposed to improve scheduling analysis of dependent tasks in radio stations that embed a TDMA communication protocol. TDMA is a channel access protocol that allows several stations to communicate in a same network, by dividing time into several time slots. This protocol has an impact on task release times, execution times, and deadlines, which needs to be considered for less pessimistic scheduling analysis results. We experiment on software radio protocols from Thales, which are representative of the system we want to analyze.

Power consumption optimization for real-time applications: Results on a MAC application implementation

This article proposes a CPU resources control module to be included in a real-time embedded system, and using platform resources tuning capabilities such as Dynamic Voltage and Frequency Scaling (DVFS). This control module has been designed to be generic enough to be adapted to any system, but precise enough to take into account real-time constraints of such systems. The solution proposed does not need any knowledge and pre-execution of the business code of the active components of the system to be monitored. The solution is demonstrated on the Medium Access Control (MAC) of a radio protocol implemented on a Freescale IMX6 board with power gains of more than 40% with frequency scale variations from 800MHz to 400MHz.

EU FP7-288307 Pharaon Project: Parallel and Heterogeneous Architecture for Real-Time Applications

In this article, we present the work-in-progress of the EU FP7 PHARAON project, started in September 2011. The first objective of the project is the development of new techniques and tools capable to assist the designer in the development of parallel embedded systems, from executable specifications to target-specific implementation and debugging on a multicore platform. This tool chain will offer and implement several parallelization strategies, reflecting the functional and non-functional constraints of the system, and driving the designer into incremental parallelization and adaptation steps. The second objective of the project is to develop monitoring and control techniques in the middleware of the system capable to automatically adapt platform services to application requirements and therefore reduce power consumption transparently.

Routing optimization for network coding

This paper presents ongoing results on the combination of ad-hoc network routing algorithms along with network coding to optimize the throughputs of multi-flows. After the presentation of the principle of the multi-flows route co-determination, the paper describes an optimization in terms of delegated nodes to extend the topologies the optimization may be applied to. Results on specific and randomized determination of topologies and flows are presented to estimate the gains expected when using these optimizations. Results on laptop demonstration follow.