ATM网络流量控制中的一种信元丢弃机制

ATM论坛将基于速率的流量控制选定为ABR业务的流量控制方法。通过对基于速率的流量控制和基于凭证的流量控制方法的研究，提出了一种信元丢弃流量控制原则，该模型继承了基于凭证方法的记数机制，通过设定高低缓存门限和调节速率升降因数来控制源端速率，仿真结果表明，这种控制机制不仅能够保证缓存的充分利用，而且能够提高其在减少信元丢失等方面的性能。

A CELL DISCARD MECHANISM FOR TRAFFIC CONTROL IN ATM NETWORKS

The asynchronous transfer mode (ATM) forum has chosen rate based control as the flow control scheme for available bit rate(ABR) service. Through the study of rate based and credit based traffic control, A cell discarding traffic control principle is proposed, which is the dynamic rate adjusting scheme based on counting mechanism of credit control. The principle controls the source rate by setting up high/low threshold of buffer and modulating the increase/decrease factor of rate, and at the same time, it uses the cell discarding mechanism to protect the switch from congestion efficiently. Simulation results show that this kind of scheme not only can give a guarantee of buffer utilization, but also can enhance the performance in cell loss, etc.