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Switched Real-Time Ethernet for Industrial Applications
Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS).
2003 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The research reported in this thesis has been focused on developing and analyzing how to support real-time traffic over a switched Ethernet network without any hardware or protocol modifications. The work has resulted in a proposed systems model, supporting both real-time and non real-time traffic. Currently this model is intended for a one-switch network, with no shared media. All added traffic handling to support real-time communication is positioned in a thin layer (RT layer) added between the Ethernet layer and the TCP/IP suite. This assures adaptation to the surrounding protocol standards. The RT layer manages traffic on the basis of virtual connections, denoted as RT channels, as well as packet level scheduling. RT channels are created between end-nodes prior to any occurrence of real-time traffic. Asymmetric deadline partitioning between the links of the RT channels is also proposed, in order to increase the number of possible RT channels.

Place, publisher, year, edition, pages
Göteborg: Chalmers tekniska högskola , 2003. , p. 16
Series
Technical report L, ISSN 1651-4963 ; 20
Keywords [en]
Switched Ethernet, Real-time communication, EDF scheduling, Industrial networks
National Category
Communication Systems
Identifiers
URN: urn:nbn:se:hh:diva-599Libris ID: 8900600Local ID: 2082/941OAI: oai:DiVA.org:hh-599DiVA, id: diva2:237779
Presentation
2003-05-27, Wigforssalen, Kristian IV:s väg, Halmstad, 13:15 (English)
Supervisors
Available from: 2007-04-10 Created: 2007-04-10 Last updated: 2018-03-23Bibliographically approved
List of papers
1. Switched real-time Ethernet with earliest deadline first scheduling - protocols and traffic handling
Open this publication in new window or tab >>Switched real-time Ethernet with earliest deadline first scheduling - protocols and traffic handling
2002 (English)In: Parallel and Distributed Computing Practices, ISSN 1097-2803, Vol. 5, no 1, p. 105-115Article in journal (Refereed) Published
Abstract [en]

There is a strong interest of using the cheap and simple Ethernet technology for industrial and embedded systems. This far, however, the lack of real-time services has prevented this change of used network technology. This paper presents enhancements to full-duplex switched Ethernet for the ability of giving throughput and delay guarantees. The switch and the end-nodes control the real-time traffic with Earliest Deadline First (EDF) scheduling on the frame level. No modification to the Ethernet standard is needed in the network that supports both real-time and non-real-time TCP/IP communication. The switch is responsible for admission control where feasibility analysis is made for each link between source and destination. The switch broadcasts Ethernet frames regularly to clock synchronize the end nodes and to implement flow control for non-real-time traffic. We have characterized the performance of the network in terms of channel acceptance ratio by simulations with different number of nodes connected to the switch.

Place, publisher, year, edition, pages
Commack, N.Y.: Nova Science Publishers, 2002
Keywords
real-time Ethernet
National Category
Computer Engineering
Identifiers
urn:nbn:se:hh:diva-2743 (URN)2082/3145 (Local ID)2082/3145 (Archive number)2082/3145 (OAI)
Available from: 2009-08-12 Created: 2009-08-12 Last updated: 2018-03-23Bibliographically approved
2. Deadline first scheduling in switched real-time Ethernet - deadline partitioning issues and software implementation experiments
Open this publication in new window or tab >>Deadline first scheduling in switched real-time Ethernet - deadline partitioning issues and software implementation experiments
Show others...
2002 (English)In: Euromicro RTS 2002: 14th Euromicro Conference on Real-Time Systems : proceedings : 19-21 June, 2002, Vienna, Austria, Los Alamitos, Calif.: IEEE Computer Society , 2002, p. 68-71Conference paper, Published paper (Refereed)
Abstract [en]

This paper presents work on a switched Ethernet network extended to allow for earliest deadline first (EDF) scheduling. We show by example that asymmetric deadline partitioning between the links of a real-time channel can increase the utilization substantially, still not violating the real-time guarantees. We also report measurements on a software implementation of the switch on an ordinary PC.

Place, publisher, year, edition, pages
Los Alamitos, Calif.: IEEE Computer Society, 2002
Keywords
real-time Ethernet
National Category
Computer Engineering
Identifiers
urn:nbn:se:hh:diva-2738 (URN)2082/3140 (Local ID)0769516653 (ISBN)9780769516653 (ISBN)076951667X (ISBN)9780769516677 (ISBN)2082/3140 (Archive number)2082/3140 (OAI)
Conference
1st International Workshop on Real-Time LANs in the Internet Age (RTLIA’02) in conjunction with the 14th Euromicro Conference on Real-Time Systems, June 18, 2002, Vienna, Austria
Available from: 2009-08-12 Created: 2009-08-12 Last updated: 2018-03-23Bibliographically approved
3. Switched real-time Ethernet in industrial applications - deadline partitioning
Open this publication in new window or tab >>Switched real-time Ethernet in industrial applications - deadline partitioning
2003 (English)In: APCC2003: the Ninth Asia-Pacific Conference on Communications : in conjunction with 6th Malaysia International Conference on Communications (MICC03) : 21-24 September, 2003, City Bayview Hotel, Penang, Malaysia / [ed] Mahamod Ismail et al., Piscataway, N.J.: IEEE, 2003, p. 76-81, article id 1274315Conference paper, Published paper (Refereed)
Abstract [en]

This paper presents work on a switched Ethernet network extended to allow for periodic real-time traffic, using earliest deadline first (EDF) scheduling. A scheme of asymmetrically dividing deadlines of real-time channels between the in and outgoing links to/from the switch is proposed (ADPS). The scheme is compared with the simpler approach of dividing the deadlines in two (SDPS). The results of several software simulations of setting up RT channels over a full-duplex switched Ethernet network are presented. The simulations show that the ADPS performs better than the SDPS when master-slave communication is assumed over the network.

Place, publisher, year, edition, pages
Piscataway, N.J.: IEEE, 2003
Keywords
Local area networks, Scheduling, Telecommunication channels, Telecommunication switching, Telecommunication traffic, Transport protocols
National Category
Communication Systems
Identifiers
urn:nbn:se:hh:diva-396 (URN)10.1109/APCC.2003.1274315 (DOI)000189415600018 ()2-s2.0-84947305578 (Scopus ID)2082/720 (Local ID)0-7803-8114-9 (ISBN)2082/720 (Archive number)2082/720 (OAI)
Conference
9th IEEE Asia-Pacific Conference on Communications, APCC 2003, in conjunction with 6th Malaysia International Conference on Communications, MICC 2003, City Bayview Hotel, Penang, Malaysia, 21-24 September, 2003
Note

©2003 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.

Available from: 2007-01-12 Created: 2007-01-12 Last updated: 2018-03-23Bibliographically approved

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