QoS-Aware Active Queue Management for Multimedia Services over the Internet
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Research Article QoS-Aware Active Queue Management for Multimedia Services over the Internet Bor-Jiunn Hwang,1 I-Shyan Hwang,2 and Pen-Ming Chang2 1 Department 2 Department
of Computer and Communication Engineering, Ming Chuan University, Tao-Yuan 33348, Taiwan of Computer Science and Engineering, Yuan Ze University, Chung Li 32003, Taiwan
Correspondence should be addressed to I-Shyan Hwang, [email protected] Received 21 October 2010; Accepted 7 February 2011 Academic Editor: Fabrizio Granelli Copyright © 2011 Bor-Jiunn Hwang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Recently, with multimedia services such as IPTV, video conferencing has emerged as a main traffic source. When UDP coexists with TCP, it induces not only congestion collapse but also an unfairness problem. In this paper, a new Active Queue Management algorithm, called Traffic Sensitive Active Queue Management (TSAQM), is proposed for providing multimedia services in routers. The TSAQM is comprised of Dynamic Weight Allocate Scheme (DWAS) and Service Guarantee Scheme (SGS). The purpose of DWAS is to fairly allocate resources with high end-user utility, and the SGS is to determine the satisfactory threshold (TH) and threshold region (TR). Besides, a multiqueue design for different priority traffic, and threshold TH and threshold region TR is proposed to achieve the different QoS requirements. Several objectives of this proposed scheme include achieving high end user utility for video services, considering the multicast as well as unicast proprieties to meet interclass fairness, and achieving the QoS requirement by adaptively adjusting the thresholds based on the traffic situations. Performance comparisons with the GRED-I are in terms of packet dropping rate and throughput to highlight the better behavior of the proposed schemes due to taking into account the fairness and different weights for video layers.
1. Introduction To improve the congestion collapse problem, the early TCP protocol prompted the study of end-to-end congestion avoidance and control algorithms [1]. Recently, several applications, such as IPTV and VoIP, using User Datagram Protocol (UDP) without employing end-to-end flow and congestion control, are increasingly being deployed over the Internet. When UDP coexists with TCP, it induces not only a congestion collapse problem but also an unfairness problem that each flow cannot get the same treatment, causing an unstable Internet and lower link utilization. The congestion control methodologies can be categorized as the Primal and the Dual [2]. The Primal congestion control is the source node dynamically adjusting the sending rate or window sizes depending on the indication information fed back from the Internet. Due to the limitations of Prime methodology, the Dual plays a more important role through assisting in the provision of more accurate and quick feedback.
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