具有开-关通信源的ATM网络信元丢失分析

Cell Loss Analysis Based ATM Networks of On-Off Traffic Source

在ATM交换中 ,由于缓冲区造成的数据丢失是影响ATM网络性能的一个重要问题。ATM网络必须设计得使信元丢失较低和可以预测信元丢失以保证用户的质量。已有的研究都是通过分配带宽和确定缓冲区大小来控制信元的丢失。这些方法有两个明显的缺点 :1)在最好情况时造成分配资源 (带宽和缓冲区 )过多。 2 )在最坏情况时造成资源分配 (带宽和缓冲区 )不足。笔者通过对具有开 关通信源系统的信元丢失的精确分析 ,得到了一系列有关缓冲区大小、带宽分配和信元丢失概率之间的关系。利用这些关系进行资源分配可以克服上述缺点。

Cell loss, which occurs when buffers overflow in ATM switches, is a key measure for the performance of an ATM network .An ATM network must be designed for very low and predictable cell loss probabilities to provide adequate quality of service for all users. Many methods have been proposed for allocating bandwidth and determining buffer size requirements to provide quality of service guarantees. These methods are subject to overly optimistic allocations or overly pessimistic allocations. The authors present an exact analysis of cell for on off traffic source which can be used in concert with probabilistic methods to ensure that buffer and bandwidth allocation are mode between the best case and worst case requirements.