大规模无线网络中(X,S)-Bottleneck 区域性能分析

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.

Performance Analysis of (X,S)-Bottleneck Cell in Large-Scale Wireless Networks

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.