非饱和条件下802.11无线网络的精确分析模型

Accurate Analytical Model for IEEE 802.11-based Networks under Nonsaturated Condition

对无线网络中节点队列间的耦合性及其带来的影响进行了研究,并首次将其应用于非饱和条件下DCF分析模型的建立。建立了非饱和条件下的服务时间模型并结合M/G/1排队模型分析了网络的时延与吞吐量。仿真实验证明了队列间的耦合性在非饱和条件下给网络带来的影响。通过仿真实验结果与数值分析结果的对比,验证了分析模型的准确性。

Queues coupling and its influence to wireless networks performance were studied, and were applied in building the analytical model of DCF mechanism under nonsaturated condition. The nonsaturated analytical model of service time was developed and based on which the delay and throughput of the network were analyzed considering M/G/1 queuing model. Simulation results demonstrate the influence brought by queues coupling under nonsaturated condition. The accuracy of the proposed model was validated through comparing the numerical results and the simulation results.