Fluid-Flow Model for Variable-Bit-Rate Video in Atm Networks

An effective model for VBR video with application to an ATM multiplexer

“…The current model is a refinement of the ones already presented in [3,4], and it is the same one used in [15,16] but uses a different approach in solving the resulting queuing system. In [3], a simple autoregressive model with a single level of activity was used.…”

“…Thus, it may be labelled as the activity ratio. In this paper, and in [15] and [16] as well, in addition to the video signal being modelled with a process that has two activity levels, it is assumed that it has unbalanced, or unequal, average state duration. The ratio of these two averages is to be used as a new parameter, which may be labeled as persistence ratio.…”

“…In the case of VBR video sources (either real time or non-real time), the traffic generated may be modelled either as a process alternating between active and silent periods (ON/OFF process), or as a continuous bit-stream with varying rate. The fluid [4,15] and semi-Markov [16] are the most common approaches falling in the first category, whereas the autoregressive model, where a video bit-rate is modelled as the weighted sum of a finite number of some previous bit-rates, is an example falling in the second category. The second approach, which is to be considered here, has been used in many recent papers.…”