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Schedulability Analysis of Ethernet Audio Video Bridging Networks with Scheduled Traffic Support
Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.ORCID iD: 0000-0003-3469-1834
University of Catania, Italy.
Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.ORCID iD: 0000-0002-1687-930X
Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.ORCID iD: 0000-0001-6132-7945
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(English)In: Real-time systems, ISSN 0922-6443, E-ISSN 1573-1383Article in journal (Refereed) Epub ahead of print
Abstract [en]

The IEEE Audio Video Bridging (AVB) technology is nowadays under consideration in several automation domains, such as, automotive, avionics, and industrial communications. AVB offers several benefits, such as open specifications, the existence of multiple providers of electronic components, and the real-time support, as AVB provides bounded latency to real-time traffic classes. In addition to the above mentioned properties, in the automotive domain, comparing with the existing in-vehicle networks, AVB offers significant advantages in terms of high bandwidth, significant reduction of cabling costs, thickness and weight, while meeting the challenging EMC/EMI requirements. Recently, an improvement of the AVB protocol, called the AVB ST, was proposed in the literature, which allows for supporting scheduled traffic, i.e., a class of time-sensitive traffic that requires time-driven transmission and low latency. In this paper, we present a schedulability analysis for the real-time traffic crossing through the AVB ST network. In addition, we formally prove that, if the bandwidth in the network is allocated according to the AVB standard, the schedulability test based on response time analysis will fail for most cases even if, in reality, these cases are schedulable. In order to provide guarantees based on analysis test a bandwidth over-reservation is required. In this paper, we propose a solution to obtain a minimized bandwidth over-reservation. To the best of our knowledge, this is the first attempt to formally spot the limitation and to propose a solution for overcoming it. The proposed analysis is applied to both the AVB standard and the AVB ST. The analysis results are compared with the results of several simulative assessments, obtained using OMNeT++, on both automotive and industrial case studies. The comparison between the results of the analysis and the simulation ones shows the effectiveness of the analysis proposed in this work.

Keyword [en]
Ethernet AVB, Scheduled Traffic, Schedulability Analysis, Response Time Analysis, Bandwidth Reservation, Over-reservation
National Category
Computer Systems
Identifiers
URN: urn:nbn:se:mdh:diva-35446DOI: 10.1007/s11241-017-9268-5OAI: oai:DiVA.org:mdh-35446DiVA: diva2:1104195
Projects
PRESS - Predictable Embedded Software Systems
Available from: 2017-05-31 Created: 2017-05-31 Last updated: 2017-06-09Bibliographically approved

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CiteExportLink to record
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Cite
Citation style
  • apa
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