| 摘要: |
| 基于二层QBDs(quasi birth-death models),提出了一个(X,S)-bottleneck 区域性能分析模型,(X,S)-bottleneck 区域的特征通过第1 层QBD 模型描述,而经过(X,S)-bottleneck 区域的每条流的特征由第2 层QBD 模型描述.基于该性能分析模型,对(X,S)-bottleneck 区域的性能进行了一些概率分析,如(X,S)-bottleneck 区域的平衡状态概率、经过该区域通信流的成功转发概率和吞吐量等,确定了上述概率及吞吐量的取值范围.仿真实验结果表明了该性能分析模型对于分析(X,S)-bottleneck 区域性能的有效性.结论有助于无线网络通信性能的改进和管理. |
| 关键词: 性能分析 无线网络 QBD(quasi birth-death) 通信瓶颈 网络性能 |
| DOI：10.3724/SP.J.1001.2012.03968 |
| 分类号: |
| 基金项目:国家自然科学基金(60873265, 60903222); 国家高技术研究发展计划(863)(2009AA11Z205); 湖南省教育厅科研基金(09C269) |
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| Performance Analysis of (X,S)-Bottleneck Cell in Large-Scale Wireless Networks |
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YAN Guo-Feng1,2, WANG Jian-Xin1, CHEN Shu-Hong1
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1.School of Information Science and Engineering, Central South University, Changsha 410083, China;2.School of Computer and Communication, Hu’nan Institute of Engineering, Xiangtan 411104, China
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| Abstract: |
| The performance analytical model for (X,S)-bottleneck cell is proposed and perform some probabilistic analysis on the performances of (X,S)-bottleneck cell, such as the probability of balance state, the transmission probability of a flow, and the throughput of (X,S)-bottleneck cell. To capture the essential aspects of (X,S)- bottleneck cell, two-hierarchy Quasi Birth-Death models (QBDs) are used to model the (X,S)-bottleneck cell. The general characters of (X,S)-bottleneck cell are govern by the first hierarchy QBDs, while the characters of each flow are captured by the second hierarchy QBDs. Based on the analytical model, a methodology to derive the balance-state probability of (X,S)-bottleneck cell is proposed, and some theoretic ranges for the transmission probability of a flow and the throughput. The simulations show that the proposed model can analyze effectively the performance of (X,S)-bottleneck cell. The results are helpful for improving and managing wireless networks. |
| Key words: performance analysis wireless networks QBD (quasi birth-death) communication bottleneck network performance |
