A Novel Control Scheme for VBR Video Transmission over ATM Networks
The Asynchronous Transfer Mode (ATM) technology is reaching a considerable level of acceptance in many contexts. One of the key characteristics of ATM is the ability to provide statistical guarantees on performance. In other words, each user has to agree with the network on a set of parameters identifying the connection characteristics (e.g. Traffic Type, Rate, Quality of Service -QoS- parameters, etc.) which will be guaranteed by the network in case the call is accepted. Real-time video applications are foreseen as one of the major users of B-ISDN. In particular the ability of the network to manage variable bit rate (VBR) traffic can be conveniently exploited by compressed video transmission systems. More precisely, with respect to the constant bit rate (CBR) video-codec, the quality of decoded signal can be kept more stable and statistical multiplexing scheme can be used in multi-channel video distribution systems for a more efficient bandwidth utilisation.
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