Reliability-aware frame packing for the static segment of flexray

Tanasă, Bogdan; Bordoloi, Unmesh D.; Eles, Petru; Peng, Zebo

doi:10.1145/2038642.2038670

Cited by 25 publications

(10 citation statements)

References 14 publications

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“…When 2 3 2 1 2 1 3 3 2 3 2 1 2 1 4 3 2 3 3 1 2 1 5 3 2 3 3 1 3 1 6 3 2 3 3 2 3 1 7 3 3 3 3 2 3 The results are demonstrated in Figure 8. For the different schemes of slot allocation, regardless of T = 1 and N st = 8 or T = 2 and N st = 16, the P SR is higher in RBPO than in Li et al 25 and Tanasa et al 26 This experiment denotes that the parameters obtained by RBPO are better than those obtained by other methods under the same conditions. Figure 9 exhibits the number of static slots calculated using RBPO, the H-1 algorithm in Li et al 25 for the different message sets.…”

Section: Comparison Of Different Slot Allocation Methodsmentioning

confidence: 70%

Reliability-based parameter design for FlexRay network in vehicles

Wang

Liu

Huang

et al. 2019

Advances in Mechanical Engineering

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FlexRay has been extensively applied to safety-critical systems, such as powertrain, chassis, and X-by-wire system in vehicles. Its transmission reliability considerably influences vehicle safety. In this study, frame coding and media access control in the FlexRay protocol are analyzed, and calculation equations are deduced for the length of time slot and coded frame of FlexRay. Redundant transmission of FlexRay static frame is introduced to solve the transmission failure caused by the bit error in the physical layer, and the transmission reliability of a static segment is defined for the mechanism. Considering the demands on transmission reliability and network schedulability, the configuration of FlexRay parameters, including communication cycle, time slot allocation, and segment length, is formulated as a generalized optimization problem with constraints on predefined transmission reliability and response time of messages. A Reliability-Based Parameter Optimization algorithm and its sub-algorithms, Response Time of Dynamic Segment and Slot Allocation for the Predefined Reliability, are presented to approximately solve the optimization model. Experiment results validate the proposed method, which can efficiently improve the transmission reliability and guarantee the real-time performance of the FlexRay network.

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Section: Comparison Of Different Slot Allocation Methodsmentioning

confidence: 70%

Reliability-based parameter design for FlexRay network in vehicles

Wang

Liu

Huang

et al. 2019

Advances in Mechanical Engineering

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“…The problem is formulated as a Constraint Logic Programming (CLP) problem, and a heuristic is proposed to address the computational complexity of CLP-based solutions. Later, in [25], the same authors apply again CLP to pack signals into frames so as to ensure that these signals are delivered on time in the presence of transient faults with a given probability, which may vary from signal to signal. The main difference with respect to [24] is that whereas in their former work they assume that frames have already been assembled and are an input to the problem, in their latter work they assume that the input are the signals that have to be packed into frames.…”

Section: A Related Workmentioning

confidence: 99%

Reliability Evaluation of Broadcast Protocols for FlexRay

Souto

Portugal

Vasques

2016

IEEE Trans. Veh. Technol.

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X-by-wire applications have extremely demanding reliability requirements that are increasingly being addressed through the adoption of distributed and fault-tolerant architectures. The development of these applications is facilitated by the availability of high level services such as agreement or reliable broadcast. Some dependable communication buses, e.g. TTP-C, already provide these services, whereas FlexRay does not.In this paper we present an approach to evaluate the reliability of a family of reliable broadcast protocols implemented both on top of FlexRay and on top of ordinary TDMA. In particular, we evaluate the impact of the acknowledgment policy on the reliability of these protocols. We express the reliability as the probability of violation of the agreement and validity properties of the protocol during a mission. For that, we develop an analytical model based on Discrete Time Markov Chains (DTMC) that considers a comprehensive set of faults (permanent, transient, omissive and asymmetric) affecting both nodes and channels, and their effects on the protocol execution. The structure of the model is quite flexible and easily adaptable to other TDMAbased protocols. In order to assess the sensitivity of the protocol to both internal and external factors, we carried out a large number of experiments considering several network configurations and fault rates. The results show that for FlexRay, the negative acknowledgment policy provides the same reliability as the positive acknowledgment policy. However, for TDMA-based protocols that lack FlexRay's ability to distinguish silence from the loss of a message, the negative acknowledgment policy leads to a lower reliability and its fitness for safety critical applications depends on the system configuration and environment conditions.

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“…The topic of fault-tolerant systems has been addressed extensively in the literature, from many different angles: starting with general design optimization methods [IPEP05], [GGPM11], [SPM10], continuing with optimizations of control systems [SBE + 12], [MEP05], and ending with considerations related to fault-tolerant communications [TBEP10], [TBEP11]. The considerable amount of research in this area highlights the importance of the topic.…”

Section: Fault-tolerant Safety-critical Applicationsmentioning

confidence: 99%

Hardware/Software Codesign of Embedded Systems with Reconfigurable and Heterogeneous Platforms

Lifa¹

2015

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M odern applications running on today's embedded systems have very high requirements. Most often, these requirements have many dimensions: the applications need high performance as well as flexibility, energyefficiency as well as real-time properties, fault tolerance as well as low cost. In order to meet these demands, the industry is adopting architectures that are more and more heterogeneous and that have reconfiguration capabilities. Unfortunately, this adds to the complexity of designing streamlined applications that can leverage the advantages of such architectures.In this context, it is very important to have appropriate tools and design methodologies for the optimization of such systems. This thesis addresses the topic of hardware/software codesign and optimization of adaptive real-time systems implemented on reconfigurable and heterogeneous platforms. We focus on performance enhancement for dynamically reconfigurable FPGA-based systems, energy minimization in multi-mode real-time systems implemented on heterogeneous platforms, and codesign techniques for fault-tolerant systems.The solutions proposed in this thesis have been validated by extensive experiments, ranging from computer simulations to proof of concept implementations on real-life platforms. The results have confirmed the importance of the addressed aspects and the applicability of our techniques for design optimization of modern embedded systems. v vi Populärvetenskaplig Sammanfattning I dag är inbyggda system vanligt förekommande och deras antal fortsätter att öka. De används inom en mängd olika domäner, t.ex. hemelektronik, fordonsindustri, flygelektronik, medicin, etc., och de hittas nästan överallt omkring oss: från våra telefoner, bärbara datorer och tvättmaskiner till våra bilar. De applikationer som körs på dessa system har flera olika ökande krav: högprestanda, energieffektivitet, flexibilitet, feltolerans, realtidsegenskaper, och naturligtvis låg kostnad. För att kunna uppfylla dessa krav har industrin anammat arkitekturer som är mer och mer heterogena och som har omkonfigureringsmöjligheter. Olyckligtvis ökar detta komplexiteten när man ska utforma effektiva inbyggda system. I detta sammanhang blir det av yttersta betydelse att utveckla effektiva optimeringsmetoder och verktyg.Dagens applikationer består av en blandning av mjukvarukomponenter som har mycket olika energi-och prestandaegenskaper beroende på vilka hårdvaruenheter där de körs på, vilket gör dem lämpliga för heterogena plattformar. En heterogen plattform består av olika typer av hårdvaruen-heter, var och en med sina egenskaper, som riktar sig till vissa tillämpn-ingsområden. Under det senaste decenniet har utvecklingen av rekonfigurerbara hårdvarutekniker accelererat, vilket bidrar till den ökande populariteten för fältprogrammerbara grindmatriser (FPGA). Idag, ger hård-varutillverkare stöd för partiell dynamisk omkonfigurering; detta innebär att delar av en FPGA kan konfigureras vid run-time, medan andra delar förblir fullt fungerande. Dessa tekniska framsteg har...

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Reliability-aware frame packing for the static segment of flexray

Cited by 25 publications

References 14 publications

Reliability-based parameter design for FlexRay network in vehicles

Reliability-based parameter design for FlexRay network in vehicles

Reliability Evaluation of Broadcast Protocols for FlexRay

Hardware/Software Codesign of Embedded Systems with Reconfigurable and Heterogeneous Platforms

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