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Online Admission Control for Multi-Switch Ethernet Networks
Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
2015 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The trend of using switched Ethernet protocols in real-time domains, where timing requirements exist, is increasing. This is mainly because of the features of switched Ethernet, such as its high throughput and availability. Compared to other network technologies, switched Ethernet can support higher data rate. Besides the timing requirements, that must be fulfilled in real-time applications, another requirement is normally demanded in real-time systems. This requirement is the ability of changing, adding or removing the messages crossing the network during run-time. This ability is known as on-line reconfiguration, and it should be done in a way that the real-time behavior of the network is not violated. This means that, the guarantee of meeting the timing requirements for the messages should not be affected by the changes in the network. In this thesis, we focus on on-line reconfiguration for multi-hop HaRTES architecture, which is a real-time switched Ethernet network. The HaRTES switch is a modified Ethernet switch that provides real-time guarantees as well as an admission control to be used for on-line reconfiguration. We study the existing reconfiguration methods including centralized and distributed approaches. Then, we propose a solution to provide on-line reconfiguration for the multi-hop HaRTES architecture, based on the studied methods. For this purpose, we use a hybrid method to achieve the advantages of both traditional centralized and distributed approaches. Moreover, we perform two different experiments. In the first experiment we focus on the decision making part of the method. The decision making part decides whether the requested reconfiguration is feasible. We calculate the time required to make the decision in different network settings. In the second experiment, we focus on the entire reconfiguration process, where the decision making is part of it. Again, we show the time needed to do the reconfiguration in several network settings. Finally, we conclude the thesis by presenting possible future works

Place, publisher, year, edition, pages
2015. , 54 p.
National Category
Embedded Systems
URN: urn:nbn:se:mdh:diva-29854OAI: diva2:877604
Subject / course
Computer Science
2015-11-13, Beta, Mälardalens högskola, Västerås, 15:08 (English)
Available from: 2015-12-08 Created: 2015-12-07 Last updated: 2015-12-08Bibliographically approved

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