| 1. |
- Ashjaei, Mohammad, et al.
(författare)
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Response time analysis of multi-hop HaRTES Ethernet Switch networks
- 2014
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Ingår i: IEEE Int. Workshop Factory Commun. Syst. Proc. WFCS. - 9781479932351
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Konferensbidrag (refereegranskat)abstract
- In this paper we focus on micro-segmented switched-Ethernet networks with HaRTES switches. HaRTES switches provide synchronous and asynchronous real-time traffic scheduling, dynamic Quality-of-Service adaptation and transparent integration of real-time and non-real-time nodes. Herein we investigate the challenges of connecting multiple HaRTES switches in order to build multi-hop communication and we propose a method, named Distributed Global Scheduling, to handle the traffic forwarding in such an architecture while preserving the unique properties of the single HaRTES switch case. Moreover, we develop a response time analysis for the method. We also evaluate the level of pessimism embodied in the anal-ysis. Finally, we show the applicability of the proposed method in an industrial setting by applying it in an automotive case study.
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| 2. |
- Liu, Meng, et al.
(författare)
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Schedulability analysis of GMF-modeled messages over controller area networks with mixed-queues
- 2014
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Ingår i: IEEE Int. Workshop Factory Commun. Syst. Proc. WFCS. - 9781479932351 ; , s. Article number 6837606-
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Konferensbidrag (refereegranskat)abstract
- The Controller Area Network (CAN) is widely utilized in many industrial real-time applications. As a real-time communication network, the predictability of timing behaviors is very important. Therefore, many works have been proposed regarding the schedulability analysis of CAN messages. Most of the existing analysis approaches are based on a traditional periodic message model. However, in some applications, the transmission of a message may follow a certain pattern instead of repeating the same transmission period by period. In these cases, applying the existing analysis methods may lead to quite pessimistic results. In order to tackle this problem, in this paper we apply the Generalized Multi-Frame (GMF) task model on CAN messages, where both priority-based and FIFO-based message queues are taken into account. We present a corresponding sufficient schedulability analysis. According to the experimental evaluations, our analysis can provide tighter results compared to the existing CAN message response time analysis in the context of GMF-modeled messages.
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| 3. |
- Zheng, Tao, et al.
(författare)
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Medium Access Protocol Design for Time-Critical Applications in Wireless Sensor Networks
- 2014
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Ingår i: IEEE International Workshop on Factory Communication Systems - Proceedings, WFCS. - 9781479932351 ; , s. Art. no. 6837585-
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Konferensbidrag (refereegranskat)abstract
- Wireless sensor networks (WSNs) for control and monitoring applications introduce critical constraints on the design of multiple access schemes to guarantee timely data delivery. However, existing WSNs are mainly designed to conserve energy consumption and not to support timely data transmission. In this paper, we present a novel media access method defined as Wireless Arbitration which grants each user in the network with a specific arbitration frequency representing the priority to access the wireless channel. This proposed method will guarantee that messages with high priority will access the channel and deliver within the deterministic deadline. A mathematical formulation of wireless arbitration is presented together with the corresponding performance analysis of the multiple access schemes. It is shown that the proposed multiple access scheme outperforms.
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