Optimal Cell Loss Equalization for Video Multiplexers

Abstract

Video traffic multiplexers in high speed ATM networks are prone to fairness problems with respect to the per-connection cell loss ratio experienced by multiplexed video sources. The problem is a result of the random, but fixed over time, relation of the frame transmission epochs that feed a multiplexer. This paper presents a solution to this fairness problem which is based on the enforcement of controlled per--connection delays. The amount of delay imposed on each source is calculated by an optimization process at connection admission and termination instants. Two different optimization objectives, one minimax and one minisum, are considered. Their performance and their relation to buffer space constraints is examined. The loss and delay performance of the scheme is also evaluated through simulations. In particular, very low per--connection delay variance is observed, indicating reduced jitter. Finally, two implementation alternatives of the scheme on an ATM network are presented: (a) ..