Name: Ngin Hoon TongDegree: Doctor of Philosophy Dept: Electrical and Computer Engineering Thesis Title: Minimizing Queueing Delays in Computer Networks Abstract The current Internet pro
Trang 1Name: Ngin Hoon Tong
Degree: Doctor of Philosophy
Dept: Electrical and Computer Engineering
Thesis Title: Minimizing Queueing Delays in Computer Networks
Abstract
The current Internet provides a best-effort packet service using the Internet Protocol It offers no guarantees on actual packet deliveries and users need not make reservations before transmitting packets through it This architecture has been tremendously successful in supporting data applications as demonstrated by the remarkable growth of the Internet usage over the last decade However, as the Internet evolves to become a global communication infrastructure, two key weakness have become increasingly obvious Firstly, it is unable to provide ser-vice differentiation so that the network can utilize resources more efficiently to support the many new real-time applications that have started to proliferate over the Internet Secondly, there is a lack of flow isolation within aggregated traf-fic which allows congestion unresponsive flows, such as User Datagram Protocol (UDP) flows, to squeeze out the congestion responsive ones, such as Transmis-sion Control Protocol (TCP) flows In this thesis, an original service differentia-tion framework, called the Delay-Rate Differentiated Services, is proposed This framework is able to efficiently provide delay-based service differentiation and flow isolation within the best-effort traffic aggregates, thus resolving the key deficien-cies of the best-effort paradigm
Keywords: Differentiated Services, Quality of Service, Delay Differentiation, Fair Bandwidth Allocation, Control-theoretic Approach