ATM traffic management with diversified loss and delay requirements

One of the most challenging problems in ATM network design is providing diversified quality of service (QoS) to applications with distinct characteristics. A flexible priority service policy for two applications (classes) with strict-and in general distinct-deadlines and different deadline violation rates (loss rates) is studied. The proposed policy is a generalization of the shortest time to extinction (STE) policy (or the early-due-date policy which discards expired cells). The relationship of this policy to other standard ones is also discussed. Performance measures such as cell loss, mean cell-delay and the tail of the cell-delay probability distribution are derived for each class. Numerical results illustrate the effectiveness of the studied priority scheme. Finally, a low-complexity implementation scheme is proposed, which does not require time-stamp-based sorting.