An effective feedback control mechanism for Diffserv architecture

Authors:
Wang Chonggang;Long Keping;Yang Jian;Cheng Shiduan
Affiliations:
National Laboratory of Switching Technology and Telecommunication Networks Beijing University of Posts and Telecommunications (BUPT), Beijing 100876, P.R. China;National Laboratory of Switching Technology and Telecommunication Networks (BUPT), Beijing P.R. China and Centre for Ultra Broadband Information Networks (CUBIN), The University of Melbourne, Vict ...;National Laboratory of Switching Technology and Telecommunication Networks Beijing University of Posts and Telecommunications (BUPT), Beijing 100876, P.R. China;National Laboratory of Switching Technology and Telecommunication Networks Beijing University of Posts and Telecommunications (BUPT), Beijing 100876, P.R. China
Venue:
Journal of Computer Science and Technology
Year:
2002

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Abstract

As a scalable QoS (Quality of Service) architecture, DiffServ (Differentiated Service) mainly consists of two components: traffic conditioning at the edge of the DiffServ domain and simple packet forwarding inside the DiffServ domain. DiffServ has many advantages such as flexibility, scalability and simplicity. But when providing AF (Assured Forwarding) services, DiffServ has some problems such as unfairness among aggregated flows or among micro-flows belonging to an aggregated flow. In this paper, a feedback mechanism for AF aggregated flows is proposed to solve this problem. Simulation results show that this mechanism does improve the performance of DiffServ. First, it can improve the fairness among aggregated flows and make DiffServ more friendly toward TCP (Transmission Control Protocol) flows. Second, it can decrease the buffer requirements at the congested router and thus obtain lower delay and packet loss rate. Third, it also keeps almost the same link utility as in normal DiffServ. Finally, it is simple and easy to be implemented.