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Variable Bit Rate (VBR) video is currently by far the most interesting and challenging real-time application. A VBR encoder attempts to keep the quality of video output constant, and at the same time reduces bandwidth requirements since only a minimum amount of information has to be transferred. On the other hand, as VBR video traff ic is both highly variable and delay sensitive, high-speed networks (e.g. ATM) are generally implemented by assigning peak rate bandwidths to VBR video applications. This approach may however be ineff icient in a satellit e network based on a TDMA scheme. To overcome this problem, we have designed a demand-assignment satellit e bandwidth allocation algorithm in TDMA, named V2L-DA (VBR 2 Level-Demand Assignment), which manages the VBR video traff ic according to a dynamic bandwidth allocation algorithm. In this paper we discuss how to tune the proposed algorithm in order to optimise network utili sation when MPEG-1 VBR video traff ic is being transmitted. Our results indicate that most of the time only 40% of the peak rate bandwidth is needed to satisfy the VBR source, and the remaining 60% of the peak rate bandwidth can be used to transmit the datagram traff ic queued in the network stations.

A bandwidth assignment algorithm on a satellite channel for VBR traffic