Batyr S. Automatic control system for queue of borders routers

The subject of research - process packet queuing and queue management system for automatic border router. The aim is to increasing the speed of data transmission on the access channels by improving the system of automatic control packet queuing router. In PhD thesis proposed the analysis of the data transmission network with packet switching as a control object and synthesized a new queue controller. The analysis showed that the object of study can be defined as a discrete event stochastic system with random signal effect. Developed dynamic mathematical model that takes into account the discrete nature of the object and the nonlinear dynamics of the constituent elements. The simulation of the existing methods of queue management was produced with ns2 simulator. By mathematical model was researched the reaction of the object to the control signal with various load levels. There were allocated to the three states of the network segment with a different reaction to the same effect: unloaded, loaded and overloaded. The dual-loop controller with variable structure was designed. For outer loop was synthesized state determination unit of network segment based on fuzzy logic. Internal circuit switches one of three controls depending on the state of the segment. For unloaded and overloaded set method DropTail, loaded -- synthesized PI controller with aperiodic nature of the process. Simulation system with dual-loop controller showed improvement in the metric characteristics: increasing a data rate and reduction in packet loss. Scope of use - telecommunication.