ATM Network Of ABR Service Flow Control Based On Source

One of future high-speed computer communication network technologies is Asynchronous Transfer Mode(ATM)technology. The loss and congestion of information are main reasons that affect the quality of service in ATM network. Available Bit Rate(ABR)service is the only one type of traffic that can be controlled using the feedback mechanism, so, in the recent, the control and management of ABR service becomes a hot subject. The communication network is a large and hybrid system, the research on congestion control of ATM network has great significance in theory and practice for the control and communications of network. The paper is just based on it and the control theory is used to solve the congestion of controllable flow in communications network.The paper begins with the basic work principle of networks, and the feedback mechanism of ABR, and the flow control mechanism of ABR, and analyses ATM network congestion control principle in existence.Secondly, analyses rate-based flow control arithmetics in existence, most of these arithmetics improve both the fairness among active connections and the link utilization by putting more and more complexity into a switch. In the paper, we propose a flow control arithmetic in which part of rate-calculation work is moved from switches to source-systems. As a result, the proposed arithmetic reduces the rate-calculation effort and switch complexity in the switch. Furthermore, it reduces the difficulty for calculating load factor every measurement interval in switches, as well as more and more stable queue occupancy in the network, thereby it attain the full furthest excellence.In the end, we simulate for the proposed arithmetic. For three parameters put into the proposed arithmetic, they are most important for the congestion control impact of the proposed arithmetic, so in simulation, the emphases puts value scope of three parameters to simulate, and the right value is given. In the same simulation configuration, puts ERICA+ to simulate, and comparessimulation result, the result indicates that method attains good purpose. The proposed method and arithmetic affords the theory guidance for the congestion of the ATM network, and have some theory and practice significance.