摘要
ATM网络中 ABR业务的流量控制是 ATM论坛的流量管理规范 (TM4.0 )中没有完全解决的问题 ,ABR基于速率的闭环控制方案在最大——最小准则下获得了一定进展。但在拥塞发生在信源处或对突发性业务进行控制的情况下 ,添加开环控制的 ABR拥塞控制可以获得比闭环控制更佳的作用。研究了 ABR的开环控制方案 ,早期的 UILI机制本身存在一定的问题 ,在交换机处采用基于计数的 UILI机制能够取得较好的效果。
In ATM networks, the traffic control of ABR service was only partly solved in ATM forum recommandation TM4.0. The rate based close loop control for ABR under max min fairness has improved the ABR traffic control in some cases. However, in case the connection is source bottlenecked or the service is burst, ABR congest control plus open loop control can do a better job than close loop control. This article studies the open loop control for ABR. It shows that the early UILI control has some defects, UILI based on count at the switch can do a better job.
出处
《数字通信》
2000年第2期5-7,共3页
Digital Communications and Networks
