| ATM网中固定速率业务的信元时延偏差研究 |
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| 引用本文： | 李俊蕴,曾烈光. ATM网中固定速率业务的信元时延偏差研究[J]. 清华大学学报(自然科学版), 1998, 0(3) |
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| 作者姓名： | 李俊蕴 曾烈光 |
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| 作者单位： | 清华大学,电子工程系,北京,100084 |
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| 摘 要： | 信元时延偏差（ＣＤＶ）是ＡＴＭ网内引起信元丢失的主要原因之一。文中系统地分析了固定速率业务（ＣＢＲ）的ＣＤＶ的相关特性，包括信元时延特性、复用后信元流的分布特性及ＣＤＶ的影响与监控。采用固定速率业务与独立同分布的背景业务相叠加的ＦＩＦＯ离散排队系统，求出了稳态时ＣＢＲ信元时延、复用后信元流分布的母函数和信元流分布的极限情况，然后以求得的信元流分布为输入，求出了有ＣＤＶ的ＣＢＲ信元流通过漏桶监控机制时的违例信元概率，并以随机业务的泊松分布为例给出了数值计算结果。
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| 关 键 词： | 异步转移模式；固定速率业务；信元时延偏差；漏桶算法 |
Study on the CDV of the CBR traffic in ATM networks |
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| LI Junyun,ZENG Lieguang. Study on the CDV of the CBR traffic in ATM networks[J]. Journal of Tsinghua University(Science and Technology), 1998, 0(3) |
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| Authors: | LI Junyun ZENG Lieguang |
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| Affiliation: | LI Junyun,ZENG Lieguang Department of Electronic and Engineering,Tsinghua University,Beijing 100084,China |
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| Abstract: | CDV is the main cause leading to cell loss in asynchronous transfer mode (ATM) networks. This paper analyzes related characteristic of the CDV imposed on the constant bit rate traffic, including cell delay, cell stream distribution of the CBR traffic subject to CDV and the effect and policing of CDV. Based on the discrete FIFO queue system in which CBR traffic is mixed with i.i.d background traffic, this paper resolves the generation function of the cell delay, cell stream distribution of the CBR traffic subject to CDV and the dimensioning of leaky bucket policing mechanism when the CBR cell stream subject to CDV is monitored. Moreover, the numerical result is presented as an example of Poisson distribution. |
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