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Active networks technology and dynamic QoS

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dc.contributor.advisor Kanchana Kanchanasut, Professor (Chairperson) en_US
dc.contributor.author Tippyarat Tansupasiri en_US
dc.date.accessioned 2015-01-12T10:36:37Z
dc.date.available 2015-01-12T10:36:37Z
dc.date.issued 2005-02 en_US
dc.identifier.other AIT Diss no.CS-05-05 en_US
dc.identifier.uri http://www.cs.ait.ac.th/xmlui/handle/123456789/98
dc.description 94 p. en_US
dc.description.abstract The Internet has been known to be a best-effort network that offers no provision for reliable data transfer or delivery time. Some Internet applications, however, have specific requirements for their transmission and demand a better quality of service (QoS) from the network. This study proposes a dynamic QoS, or D-QoS, model on IP networks where QoS settings can be automatically reconfigured based on the concept of active networks. The system allows authorized users to request network interruptions that allow their privileged flows to be optimally transmitted at the expense of other existing traffic. The requests are carried in the program part of each active packet and instruct each D-QoS node traversed to adjust the QoS settings for the interruption. At the completion of the privileged flow transmission, the network resumes its services for the flows that had been interrupted. Different levels of privilege can be granted to authorized users enabling multi-level interruption on D-QoS nodes, where a number of privileged flows can coexist. The D-QoS model can be incrementally deployed. A network administrator may consider positioning D-QoS nodes to ensure the transmission quality of the privileged flows initially at the links where bandwidth is tight, the bottleneck links. More D-QoS nodes may be added, at a later stage, to guarantee the flow performance along the transmission path. In this dissertation, the design of D-QoS with the proposed interruption mechanism and the QoS reconfiguration scheme are explained. The functions and the performance of the model are evaluated through experiments on a small prototype, and through simulations. The model has been shown to be able to dynamically adjust the network QoS configuration according to the requests of authorized users and to offer assurance for privileged flows with improved network utilization. en_US
dc.description.sponsorship Royal Thai Government en_US
dc.language.iso en en_US
dc.publisher Asian Institute of Technology en_US
dc.relation.ispartofseries AIT Publications; en_US
dc.subject Computer networks en_US
dc.title Active networks technology and dynamic QoS en_US
dc.type Dissertation en_US


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