Improved Message Forwarding for Multi-Hop HaRTES Real-Time Ethernet Networks

Ashjaei, Mohammad; Silva, Luis; Behnam, Moris; Pedreiras, Paulo; Bril, Reinder J.; Almeida, Luís; Nolte, Thomas

doi:10.1007/s11265-015-1010-8

Cited by 13 publications

(12 citation statements)

References 35 publications

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“…logical ports, for specific predefined processing, such as forwarding packets to a set of physical ports; and iii) logical, for processing methods that are defined outside the protocol. A total of 2 24 − 1 ports are defined to be freely assigned as either physical or logical.…”

Section: The Real-time Openflow Extensionsmentioning

confidence: 99%

“…The current prototype resorts to the latter approach. Multihop time-triggered forwarding is accomplished by scheduling that traffic simultaneously in all traversed switches, a method known as Reduced Buffering Scheme (RBS) [24].…”

Section: Mediating Rtof and The Real-time Data Planementioning

confidence: 99%

“…the time lapse between the instant in which a respective frame becomes ready at the sender's interface and the instant in which its reception at the receiver's interface terminates. Currently, the response times are computed as described in [24] for HaRTES multi-hop networks in RBS mode but other analytical techniques, e.g. Network Calculus, can be used, too.…”

Section: B Admission Controlmentioning

confidence: 99%

“…R for flow S i is computed following the function calcFlowR (lines 24-37). In short, the function computes the response time of traffic frames from the source to the sink node while checking whether frames are buffered and sent in the following EC by any switch along the route [24]. The computation is performed on a link-by-link basis, from the first link in the L i set (line 26) until its last link (N ł i ) (line 27).…”

Section: Algorithm 1 Admission Control For a New Flow S Reqmentioning

confidence: 99%

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A Real-Time Software Defined Networking Framework for Next-Generation Industrial Networks

2019

Self Cite

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Industry 4.0 brings in a whole set of new requirements to engineering industrial systems, with notorious impact at the networking layer. A key challenge posed by Industry 4.0 is the operational flexibility needed to support on-the-fly reconfiguration of production cells, stations, and machines. At the networking layer, this flexibility implies dynamic packet handling, scheduling, and dispatching. Software-Defined Networking (SDN) provides this level of flexibility in the general Local Area Network (LAN) domain. However, its application in the industry has been hindered by a lack of support for real-time services. This paper addresses this limitation, proposing an extended SDN OpenFlow framework that includes realtime services, leveraging existing real-time data plane Ethernet technologies. We show the OpenFlow enhancements, a real-time SDN controller, and experimental validation and performance assessment. Using a proof-of-concept prototype with 3 switches and cycles of 250µs, we could achieve 1µs jitter on timetriggered traffic and a reconfiguration time between operational modes below 10ms. INDEX TERMS HaRTES, Industry 4.0, OpenFlow, real-time communications, software-defined networking.

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Section: The Real-time Openflow Extensionsmentioning

confidence: 99%

Section: Mediating Rtof and The Real-time Data Planementioning

confidence: 99%

Section: B Admission Controlmentioning

confidence: 99%

Section: Algorithm 1 Admission Control For a New Flow S Reqmentioning

confidence: 99%

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A Real-Time Software Defined Networking Framework for Next-Generation Industrial Networks

2019

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“…Unlike the classical fieldbuses for holding short data transmission, Ethernet provides a longer packet size . Ethernet was first designed by Robert Metcalfe for computer and laser printer communication.…”

Section: Related Workmentioning

confidence: 99%

RTEthernet: Real‐time communication for manufacturing cyberphysical systems

Nguyen

Leu

Liu

2018

Trans Emerging Tel Tech

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Cloud manufacturing yields insights of manufacturing services over cyberspace based on the integration of advanced manufacturing with cloud computing. However, the different communication standards between the different system levels are the main challenge for the integration without conflicting communication. Ethernet appears to be the best solution to support all levels for industrial manufacturing systems. Since the synchronous integration is fulfilled, the prerequisite for deciding the overall performance of systems is adaptable real‐time communication. This motivates us to study the problem of designing a new real‐time communication based on Ethernet standards to enable real‐time processing for factory networks, termed real‐time Ethernet (RTEthernet). In this paper, we introduce new architectures for master and controller stations. The objective is to have the maximum number of machines transmitting data in a data transmission window (coordinated cycle). The problem is called the maximum number of real‐time data transmission (MNRDT) problem. The MNRDT is shown to be NP‐hard. An approximation and three relevant solutions are proposed for addressing the reduction of MNRDT and the MNRDT problem. Simulation results are provided to show the performance of proposed solutions.

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