多速率系统呼叫级和分组级的损失率分析Analysis-信息通信学术期刊网.PDFVIP

第 28 卷第 9 期 通 信 学 报 Vol.28 No.9 2007 年 9 月 Journal on Communications September 2007 多速率系统呼叫级和分组级的损失率分析 蒋红艳, 林亚平, 黄生叶 （湖南大学 计算机与通信学院，湖南 长沙 4 10082 ） 摘 要：对提供多速率实时 VBR 业务的系统中呼叫级和分组级的主要性能指标的分 计算进行 了深入研究，从 多维 Markov 链 的全局平衡条件 出发，提 出了一种计算在部分共享策略下各业务在线连接数的联合概率分布的方 法，在此基础上可算 出呼叫损失概率和分组丢失率，仿真结果表 明了其准确性 。 关键词：多路复用 ；呼叫损失概率；分组丢失率；部分共享 中图分类号：TN913.24 文献标识码 ：A 文章编号：1000-436X(2007)09-0015-07 Analysis of loss probabilities on the call level and packet level in a multi-rate system JIANG Hong-yan, LIN Ya-ping, HUANG Sheng-ye (College of Computers an Communications, Hunan University, Changsha 4 10082, China) Abstract: A syste atic research on the perfor ance analysis on the call level and the packet level in a syste with ulti-rate VBR services was ade. According to the global balance condition of a ulti-di ensional Markov chain, an algorith of accurately evaluating the probability distribution of on-line connections of each service type in a syste with partial sharing policy was proposed. Further, the call blocking probability and the packet loss probability were ob- tained. Si ulation results show that the algorith is accurate. Key words: ultiplexing; call blocking probability; packet loss probability; partial sharing 务质量保证措施的复杂性。 1 引言