DFT4FTT - Dynamic Fault Tolerance for increasing the adaptivity of highly-reliable distributed embedded systems based on Flexible Time-Triggered Ethernet

Type | Spanish research project
Duration | 2016 - 2018
Project leader Julián Proenza Arenas
Collaborators Manuel Alejandro Barranco González | Alberto Ballesteros | Ines Alvarez Vadillo | David Gessner | Sinisa Derasevic | Guillermo Rodríguez-Navas González

FOCUS

Design, evaluation, validation, implementation and verification of two types of fault tolerance mechanisms for systems based on FTT-Ethernet. On the one hand, some specifically designed for increasing the reliability of the part of the functionality of the network that is related to its flexibility and, on the other hand, some dynamic ones intended to increase the flexibility of the fault tolerance added to the system.

DESCRIPTION

This work is supported in part by the Spanish Agencia Estatal de Investigación (AEI) and in part by FEDER funding through grant TEC2015-70313-R (AEI/FEDER, UE). Adaptive embedded systems should be able to automatically adjust their internal strategies in response to requirement changes. They require services supporting flexibility, real time and dependability at different levels of the system architecture, which in the case of distributed embedded systems (DESs) includes the network level. In this sense, there is still significant research pending to bring adaptivity to one of the most ubiquitous network technologies available, namely Ethernet, which is being used more and more as the underlying network technology for DESs. Specifically, there is a need for making Ethernet-based DESs capable not only of adapting to changing real-time requirements, but also of changing dependability, and especially reliability, requirements. This would allow an Ethernet-based DES to reallocate resources to make a certain more critical service more reliable if this is required. An example might be a car exposed to increased electromagnetic interference when traveling near power lines. Making a system more adaptive in terms of reliability can be achieved through so called dynamic fault tolerance. Thus, making an Ethernet-based DES both adaptive in terms of real-time and reliability can be achieved by providing dynamic fault tolerance to Ethernet technologies that already provide services for flexible real-time requirements. One such technology is FTT-Ethernet, since it provides communication services that allow the nodes of the system to change the real-time attributes of the exchanged messages without interrupting the service provided by the system. The goal of the predecessor project, FT4FTT-Ethernet (DPI2011-22992), was to make FTT-Ethernet highly reliable by using static, as opposed to dynamic, fault tolerance mechanisms. In contrast, this new project aims at improving FTT-Ethernet by providing it with dynamic fault tolerance mechanisms. This would allow FTT-Ethernet to be used as the underlying network for adaptive DESs that not only need to adapt to changing real-time requirements, but also to changing reliability ones.

PUBLICATIONS

I. Alvarez, J. Proenza, L. Almeida. Study of the Admission Control in the Flexible Time-Triggered and the Audio Video Bridging Communication Protocols. Universitat de les Illes Balears, 2016.

M. A. Barranco, A. Zendouh, A. Ballesteros, J. Proenza. Improving Maintenance of FT4FTT: Extending it to Monitor and Log its Available Redundancy via Internet. In Proceedings of the 21th IEEE International Conference on Emerging Technologies and Factory Automation (ETFA 2016), 2016.

I. Alvarez, M. Knezic, L. Almeida, J. Proenza. A First Performance Analysis of the Admission Control in the HaRTES Ethernet Switch. In Proceedings of the 21th IEEE International Conference on Emerging Technologies and Factory Automation (ETFA 2016), 2016.

A. Ballesteros, S. Derasevic, M. A. Barranco, J. Proenza. First Implementation and Test of Reintegration Mechanisms for Node Replicas in the FT4FTT Architecture. In Proceedings of the 21th IEEE International Conference on Emerging Technologies and Factory Automation (ETFA 2016), Berlin, 2016.

S. Derasevic, M. A. Barranco, J. Proenza. Designing fault-diagnosis and reintegration to prevent node redundancy attrition in highly reliable control systems based on FTT-Ethernet. In Proceedings of the 12th IEEE World Conference on Factory Communication Systems (WFCS 2016), Aveiro, 2016.

I. Alvarez, L. Almeida, J. Proenza. A First Qualitative Comparison of the Admission Control in FTT-SE, HaRTES and AVB. In Proceedings of the 12th IEEE World Conference on Factory Communication Systems (WFCS 2016), Aveiro, 2016.

A. Ballesteros, S. Derasevic, D. Gessner, F. Font, I. Alvarez, M. A. Barranco, J. Proenza. First Implementation and Test of a Node Replication Scheme on top of the Flexible Time-Triggered Replicated Star for Ethernet. In Proceedings of the 12th IEEE World Conference on Factory Communication Systems (WFCS 2016), Aveiro, 2016.


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