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为了准确研究多跳Ad hoc网络可提供的应用层服务情况,提出了一种融合载波监听多址接入冲突避免机制(CSMA/CA)和隐藏节点效应的系统容量建模方法.多跳通信环境下CSMA机制和隐藏节点效应的共同作用使节点的竞争占用信道情况变得复杂.通过分析节点在整个信道接入过程中所经历的竞争行为来建立模型,推导了在CSMA和隐藏节点共同作用情况下系统可达到的最佳吞吐率表达式,给出了基于802.11b/g媒体接入控制机制参数下系统最佳吞吐率的理论数值结果和仿真结果.仿真结果表明,新的建模方法和理论模型能准确估计多跳Ad hoc网络的应用层服务支撑情况.
In order to accurately study the application layer services provided by multi-hop Ad hoc networks, a system capacity modeling method based on CSMA / CA and hidden node effect is proposed. Multi-hop communication environment Under the cooperation of CSMA mechanism and hidden node effect, the contention occupied channel condition of nodes becomes complicated.Analyzing the competitive behavior of nodes in the whole channel access process to establish the model, and deriving the interaction between CSMA and hidden nodes The optimal throughput of the system under 802.11b / g medium access control is given based on the numerical results and the simulation results of the optimal throughput of the system.The simulation results show that the new modeling method and Theoretical model can accurately estimate the multi-hop Ad hoc network application layer service support situation.