Effective video transmission system using fast bandwidth reservation protocol for ATM networks

Among the calls handled in an ATM network, video transmission takes a large bandwidth. In addition, since the traffic is bursty, an efficient traffic control technique is desired. The variable bit rate transmission control me thod studied to date has a high efficiency but suffers from the problem tha t the video quality on the receiving side is significantly degraded if ther e is cell loss. In this paper, for real-time video information, a system fo r information transmission without causing cell loss, using the fast bandwi dth reservation protocol of the ATM network, is proposed. In the system, wh en the video frame to be transmitted generates burst traffic, this traffic is detected at the transmission end beforehand and a request to temporarily extend the bandwidth of the call is generated for the switch. If the reque st is not granted, the transmission of the burst traffic is in effect delay ed by a new control operation called picture replacing which allows reducti on of video quality. In this paper, the proposed system is evaluated from t he point of view of transmission efficiency and degree of video quality deg radation. The results are compared with fixed rate transmission systems. (C ) 2000 Scripta Technica.