01567nas a2200157   4500008004100000245007900041210006900120260001500189300001300204520097900217653000901196100002101205700002201226700002701248856013401275       2007                        eng d00aAn efficient mechanism for adaptive multimedia transmission in 3G networks0 aefficient mechanism for adaptive multimedia transmission in 3G n  c3 - 8 July  a 11 - 183 aThis paper proposes a mechanism for the congestion control for video transmission over Universal Mobile Telecommu-nications System (UMTS). Our scheme is applied when the mobile user experiences real time multimedia content and adopts the theory of a widely accepted rate control method in wired networks, namely equation based rate control. In this approach, the transmission rate of the multimedia data is determined as a function of the packet loss rate, the round trip time and the packet size and the server explicitly adjusts its sending rate as a function of these parameters. Through a number of simulations and experiments we validate the correctness and measure the performance and efficiency of the mechanism. The mechanism at first level is evaluated through simulations that carried out in the ns-2 simulator. At sec-ond level, in order to validate the proposed mechanism in real world traffic scenar-ios we perform some experiments in a commercial UMTS network.10aUMTS1 aBouras, Christos1 aAlexiou, Antonios1 aBarounis, Konstantinos  uhttp://telematics.upatras.gr/telematics/publications/efficient-mechanism-adaptive-multimedia-transmission-3g-networks?language=el