A Logic-based Switching Control Approach to Active Queue Management for Transmission Control Protocol

A novel logic-based switching control strategy for internet congestion is applied for asymptotically stabilizing a class of transmission control protocol (TCP) networks at a desired operating point. We consider the problem of output feedback control instead of state-feedback control. The uncertainties with respect to the number of the active TCP sessions are considered. A high gain observer for the TCP window size is proposed to aid the task of designing an active queue management (AQM) controller with only the output (queue size) measurement. Implementation issues are also discussed. Simulations are provided to validate that the proposed design method can improve the transient performance of the system.