TCP Libra: Derivation,analysis, and comparison with other RTT-fair TCPs |
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| Authors: | Gustavo Marfia Claudio E Palazzi Giovanni Pau Mario Gerla Marco Roccetti |
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| Affiliation: | 1. Computer Science Department, University of California, Los Angeles, CA 90095, United States;2. Dipartimento di Matematica Pura e Applicata, Università degli Studi di Padova, 35121 Padova, Italy;3. Dipartimento di Scienze dell’Informazione, Università di Bologna, 40126 Bologna, Italy;1. Department of Nephrology, College of Medicine, Inje University, Busan, Korea;2. Department of Nephrology, College of Medicine, Kyung Hee University, Seoul, Korea;3. Kohwang Medical Research Institute, School of Medicine, Kyung Hee University, Seoul, Korea;4. Department of Chest Surgery, College of Medicine, Inje University, Busan, Korea;5. Department of Microbiology and Immunology, College of Medicine, Inje University, Busan, Korea;1. School of Electrical Engineering and Computer Science, Center for Computation and Technology, Louisiana State University, Baton Rouge, LA, USA;2. Department of Computer Science, Troy University, Troy, AL, USA;1. Cardiovascular Medicine, Jiangsu Subei People''s Hospital, China;2. Cardiovascular Medicine, Sun Yat-sen Memorial Hospital of Sun Yat-sen University, Guangzhou, China;1. College of Computer Science, Sichuan University, Chengdu 610064, PR China;2. College of Computer Science and Information Technology, Yunnan Normal University, Kunming 650092, PR China;3. Department of Computer Science and Engineering, Konkuk University, Seoul 143-701, Republic of Korea |
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| Abstract: | The Transmission Control Protocol (TCP), the most widely used transport protocol over the Internet, has been advertised to implement fairness between flows competing for the same narrow link. However, when session round-trip-times (RTTs) radically differ, the share may be anything but fair. This RTT-unfairness represents a problem that severely affects the performance of long-RTT flows and whose solution requires a revision of TCP’s congestion control scheme. To this aim, we discuss TCP Libra, a new transport protocol able to ensure fairness and scalability regardless of the RTT, while remaining friendly towards legacy TCP. As main contributions of this paper: (i) we focus on the model derivation and show how it leads to the design of TCP Libra; (ii) we analyze the role of its parameters and suggest how they may be adjusted to lead to asymptotic stability and fast convergence; (iii) we perform model-based, simulative, and real testbed comparisons with other TCP versions that have been reported as RTT-fair in the literature. Results demonstrate the ability of TCP Libra in ensuring RTT-fairness while remaining throughput efficient and friendly towards legacy TCP. |
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