The robust tracking control for a classof discrete time nonlinear networked control systemsisinvestigated.The network characteristices

networked induced delay and data packet dropout

are considered in data transimission.The input delay approach in continuous time control systems is used to model the discrete time networked tracking control systems.By using the parallel distributed compensation technique and considering the firing mechanism of the fuzzy tracking controller

a discrete time fuzzy model

which satisfies system operation mechanism

is proposed to describe such tracking control systems.Based on the Lyapunov stability theory

a stabilization criterion is proposed for nominal model of such tracking control systems

such that the tracking error systems satisfies a given H∞ tracking performance

then a sufficient condition for the existence of robust tracking controller is presented in terms of linear matrix inequality.A simulation example shows the effectiveness of the proposed tracking control method.