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General window-based congestion control: buffer occupancy, network efficiency and packet loss

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3 Author(s)
Li-song Shao ; Sch. of Comput., Nat. Univ. of Defense Technol., Changsha ; He-ying Zhang ; Wen-hua Dou

High speed networks with long distance present a unique environment where TCP have a problem under-utilizing the bandwidth of bottleneck link. To remedy this problem, many proposals, such as window-based mechanisms (HSTCP and STCP), rate-based ones (Fast TCP) and router-assistant ones (XCP), have been suggested. The recent researches show that the buffer size in routers heavily affects the performances of HSTCP, especially network efficiency. This paper studies the performances of general window-based mechanisms, such as buffer occupancy, network efficiency and packet loss. The study of buffer occupancy shows that large increment function and small buffer size will result in pseudo-congestion, from which HSTCP and slow start of TCP suffer, under-utilizing the capacity of bottleneck link. We propose asymptotic square increase (ASI) mechanism, whose increment function is an increase additive function. Not to cause pseudo-congestion, a design principle of the buffer size of routers is given for the increment function of additive increase (AI), Multiplicative Increase (MI) and ASI. In this paper, the study of network efficiency shows that the concave increase mechanisms can obtain more network efficiency at smaller cost of packet loss than additive and convex ones

Published in:

Communication Networks and Services Research Conference, 2006. CNSR 2006. Proceedings of the 4th Annual

Date of Conference:

24-25 May 2006

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