Enhanced EFCI Switch Algorithm Using Model Predictive Methods

In rate-based flow control scheme, the important problem is to how to determine congestion occurrence and relief. The common methods is to set explicit feedback congestion indication (EFCI) bit in data header or nonincrease NI and congestion indication (CI) bits in RM cells to fulfil the task. Howerver, many studies have reported that the algorithm often cause the buffer occupancy oscillation due to time-variant delay. An enhanced EFCI switch algorithm is proposed by using queue length prediction instead of the measured queue length at the switch. The simulation results demonstrated that the improved method deeply constraints oscillation magnitude at presence of large time-variant delay and queue length is controlled in limited scale to guarantee cell zero loss