Cell-access control for multiple cell-loss classes in shared ATM output buffer

A cell-access control scheme is described for guaranteeing multiple classes of cell-loss quality-of-service (QoS) requirements in an output buffer of an ATM switch shared by multiple connections. A class acceptance controller is proposed which regulates the acceptance of cells of QoS classes based on the state of the queue. Decision functions for the class-acceptance controller are considered with a view to comparing their effects on QoS performance. A queueing analysis uses a discrete-time finite-capacity queueing model and derives important performance measures. The implications of the work are discussed using numerical experiments