突发业务环境下CBR业务性能的实验分析
ON THE EXPERIMENT ABOUT QOS OF CBR TRAFFIC IN A BURSTY ENVIRONMENT
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摘要: CBR业务是一类极为重要的实时业务,能否有效地传递这类业务关系到从现有网络向ATM的过渡,因此CBR业务的服务质量是一个值得研究的重要课题。本文利用计算机仿真的方法,全面地分析了突发业务环境下,影响CBR业务服务质量的各种因素,指出复接器占有率、缓冲区容量、背景强度、背景流的自相关特征对CBR业务的时延及时延抖动有很大的影响,尤其是背景流具有长时相关性时,CBR业务的服务质量将严重恶化,必须设法加以控制。
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关键词:
- 时延; 时延抖动; 自相关; TES模型
Abstract: CBR is one of the most important kinds of real-time traffic in ATM network. Guarantying the quality of service(QOS) of CBR traffic is crucial to the success of ATM technology. So, analyzing the QOS of the CBR traffic is worth studying. The paper analyzes the QOS of CBR traffic in a bursty enviroment through computer simulation. It is found that multiplexer utilization, buffer capacity, background intensity and autocorrelation property of the background traffic can all make hard effects on the delay and delay jitter of CBR traffic. Especially, when the background traffic exhibits long-range dependence, the QOS of CBR traffic will degrade severely. Some control actions should be taken to minimize the effects of all the factors. -
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