Robust Stochastic Flow Management for TCP/AQM System

Robust H∞ Static Output Feedback Control for TCP/AQM Routers Based on LMI Optimization

“…The paper [6] developed the static state feedback controller to minimize the H ∞ norm of the transfer function with time delays from the exogenous input to the desired output, based on the time domain approach. Hence, it is more reasonable to compare the performances of the proposed static output feedback H ∞ synthesis with those of the memoryless state feedback H ∞ synthesis in [6] than other dynamic output feedback control methods [10,[14][15][16][17][18][19][20][21]. The proposed method was also compared with RED (Random Early Detection), which is one of the most popular existing control methods for AQM routers [3].…”

“…In this context, the available link capacity changes over time are considered as disturbances [12,13]. Thus, researchers have applied various H ∞ techniques for AQM routers with respect to memoryless state feedback [6,14] and dynamic output feedback control methods [15][16][17] for infinite dimensional systems with time delays and disturbances.…”

“…First, in previous studies such as [6,14], the memoryless state feedback H ∞ techniques were proposed to deal with RTT (Round Trip Time) delay and external disturbances. [6,14] have contributions that are relatively easier to design without high-order compensators and can be analyzed in practice. They also take into account the time-domain H ∞ design method, which can deal with time varying states.…”