T2-2 - Sedma Nacionalna Konferencija so Me|unarodno U~estvo...

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IMPROVEMENT OF THE AIMD ALGORITHM FOR MULTIMEDIA TRANSFER OVER INTERNET Liang Zhao 1 , Yuan-Wei Jing 1 , Ljupco Kozovski 2 , Georgi M. Dimirovski 3, 4 1 Northeastern University, Institute of Control Science – School of Information Science & Engineering, Shenyang – Liaoning, 110004, P. R. of China, E-mails: [email protected] ; [email protected] 2 IBM Global Services, Strategic Outsourcing, 4175 14 th Avenue – Markham, Ontario L3R 5R5, Canada, Fax: +1 905 316 7940, E-mail: [email protected] 3 Dogus University, Department of Computer Engineering – Faculty of Eng., Acibadem – Kadikoy, 34722 Istanbul, Turkey, FAX: +90-216- 327-9631; E-mail: [email protected] 4 SS Cyril & Methodius University, Institute of ASE - Faculty of Electrical Eng., 1000 Skopje, Rep. of Macedonia Abstract: The Additive Increase Multiplicative Decrease (AIMD) algorithm has been investigated and a novel, improved TCP-friendly flow control algorithm derived. This algorithm provides basic flow congestion control for multimedia data traffic over Internet, and also fulfils the fairness between RTP flows and TCP flows while retaining essential characteristics of AIMD. The important parameters, which are involved in network communications, have been especially considered and properly innovated into the redefined improved algorithm. Thus all the innovation work done to AIMD algorithm help smoothing multimedia transfer and guarantees the fairness among TCP flows and RTP flows. Copyright © 2005 ETAI and Authors Keywords: AIMD algorithm; communication protocols; communication systems; networks; multimedia communication; quality of service; RTP flow; TCP-friendly. 1. INTRODUCTION Due to the recent developments of computer networks and communication technology, customers nowadays are no longer satisfied with the more traditional applications of communication network services, e.g. such as ftp, e-mail, etc. Currently multimedia applications are so popular that multimedia communications have attracted focused attention as one of the key technologies of the multimedia field, which is expanding rapidly and shall continue to grow (Prasad, 2003; also see Figure 1). In turn, this trend has given incentives to further research and development work on Internet Protocol based communication networks, currently with most of research efforts focused on multimedia and wireless networks (Figure I) as well as on protocol based controls of communication traffic. Fig. I. Evolution trends of IP-based multimedia and wireless communications (Prasad, 2003). As for the Internet, the TCP (transfer control protocol) is the main protocol technology, which is used to manage file transfers into communication networks that are systems shared by many and diverse users. There are present a finite buffer and delays in transmission of state information to the controllers allowing for regulated rate of sending information and it’s routing. The robustness of the current Internet is by and large due to the efficient end-to-end congestion control mechanisms employed within it (Altman and Swartz, 1989; Bolot, 1993; Chiu and Jain, 1989; Fendrick and Rodrigez, 1994).
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