National Changhua University of Education Institutional Repository : Item 987654321/10138

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NCUEIR > College of Engineering > Department and Graduate Institute of Computer Science and Information Engineering > Periodical Articles > Item 987654321/10138

Please use this identifier to cite or link to this item: http://ir.ncue.edu.tw/ir/handle/987654321/10138

Title:	WARD: A Deterministic Fluid Model
Authors:	Ho, Cheng-Yuan;Chan, Yi-Cheng;Chen, Yaw-Chung
Contributors:	資訊工程學系
Date:	2007-08
Issue Date:	2012-05-04T08:27:47Z
Publisher:	The Institution of Engineering and Technology
Abstract:	Queue management, bandwidth share and congestion control are very important to both the robustness and fairness of the Internet. A new TCP-friendly router-based active queue management scheme, called WARD, approximates the fair queueing policy. WARD is a simple packet dropping algorithm with a random mechanism and discriminates against the flows which submit more packets per second than is allowed by their fair share. By doing this, it not only protects transmission control protocol (TCP) connections from user datagram protocol (UDP) flows, but also solves the problem of competing bandwidth among different TCP versions, such as TCP Vegas and TCP Reno. Furthermore, it is stateless and easy to implement, soWARD controls unresponsive or misbehaving flows with a minimum overhead. In this article, we present a deterministic fluid model of TCP/WARD system, and explain the UDP throughput behaviour with WARD. Also, we prove that, provided the number of TCP flows is large, the UDP bandwidth share peaks at (2e)21 � 0.184 when UDP input rate is slightly larger than link capacity and drops to zero as UDP input rate tends to infinity.
Relation:	IET Communications, 1(4): 711-717
Appears in Collections:	[Department and Graduate Institute of Computer Science and Information Engineering] Periodical Articles

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