tailieunhanh - Báo cáo hóa học: " Research Article QoS-Aware Active Queue Management for Multimedia Services over the Internet"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article QoS-Aware Active Queue Management for Multimedia Services over the Internet | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2011 Article ID 589863 12 pages doi 2011 589863 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 of Computer and Communication Engineering Ming Chuan University Tao-Yuan 33348 Taiwan 2 Department of Computer Science and Engineering Yuan Ze University Chung Li 32003 Taiwan Correspondence should be addressed to I-Shyan Hwang ishwang@ 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 .