Based On Opnet Network Congestion Control Structures And Control Algorithms

Computer network is an important landmark into information generation, and it has comprehensively changed human being's life and work styles. Researching on network model & control algorithm, reducing network congestion and packets transmission time-delay, strengthening transmission efficiency, and improving communication quality for users are the goals that we are always pursuing in the area of Information Technology.Lying on the Field Bus Technology & Automation the key lab of Beijing, using the tool of control theory and OPNET network simulation software, supported by open foundation and Sun Dehui processor' elaborate guide, my research focuses on network congestion avoidance and packets time-delay, a large quantity of research is done and some achievement has been attained.The paper analyzes the present congestion and time-delay situation, discusses the present advantage and limitation of various congestion control mechanism in detail, expounds normal model theory of network, illustrate the theoretical model of network packets arrival and node services, research the modeling and simulating method of simulated mode about network and information data, loop linearity control based on regulation of input rate, loop nonlinearity control based on regulation of input rate, network loop control of several nodes based on neural net, typical active queue management means such as random early detection(RED) and adaptive RED, loop control of discard probability of node queue based on the poisson-distributed source, loop control of integrated services discard probability based on multisource share memory, loop control of differentiated services discard probability based on multisource share memory, loop control of network time-delay based on information queued online,and the control mechanisms of concrete control structure and algorithm are proposed .These seven control structures & algorithms provided in this paper, which simulate based on OPNET software, show performance of control mechanism.