A flow control approach for encoded video applications over ATM network

Abstract

This paper addresses the problem of transmission of digital video communication over B-ISDN such as the ATM network. It provides the appropriate solution based on a good knowledge of both the video system interface design and broadband network capabilities. An interface between MPEG-2 and ATM network architecture is studied to improve the video visual quality. The presented approach try to overcome the difficulty imposed by traditional random cell discarding due to the bursty and variable bit rate transmission, nature of compressed video. The presented approach is guided by using a dynamic bandwidth management with the maximum flexibility via an appropriate scheduling algorithm and a new cell discarding scheme. In order to support these mechanisms, enhancement to the ATM adaptation layer is performed and a new MPEG-2 mapping strategy is also proposed. The performance evaluation have shown a significant minimization of losses ATM cells and a best video quality compared with the sequence transmitted without flow control.