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中文摘要：
对Ad hoc网络各种路由协议进行仿真评估，分析他们在不同约束条件下不同度量的相对性能，是了解与学习路由协议性能的主要手段。目前的工作主要以停留时间的变化来构造仿真模型，但是过长的停留时间体现不出Ad Hoc网络的动态特性。与此相反，在固定的停留时间下，从网络节点密度的变化出发，以QoS和效率为指标，仿真分析了Ad Hoc网络的四种路由协议在不同运动场景下的相对性能，对相关文献的观点进行了补充和完善，并且由于考虑问题角度的不同，得出了不尽一致的结论，为进一步研究支持QoS的Ad Hoc路由算法提供参考。
英文摘要：
It＇s the main method to study the relative performance of routing protocols with simulation in different conditions and metrics. The related works took the simulation model with a constant network size and a varying pause times or mobility velocities,however, a longer pause time of the node may be insignificant for mobile Ad hoc network with frequently and fastly moving nodes. On the contrary, based on the metrics of QoS and efficiency ,this paper analyses the relative performance of four ad hoc routing protocols with a varying node density and a const puase time ,and supplements the points of the related works. Because of the different prospects for taking into account the problem,we draw the inconsistent conclusion. It provides the reference for further study on Ad Hoc routing algorithms supporting the QoS.
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