基于3-D SGM移动模型的MANET链路动态性

针对目前移动Ad hoc网络(MANET)的链路动态性研究多采用传统RD、RWP等移动模型,存在速率突变、急转等不符合现实物体运动规律的现象,致使结论的准确性不高的问题,基于三维平滑高斯半马尔科夫移动模型,采用马尔科夫链理论研究了三维MANET的链路动态性,通过计算两节点间相对速率的概率密度函数和分离距离的一步转移概率矩阵,得到了链路断开概率和链路寿命期望的数学表达式。最后通过仿真实验进行了验证,表明了理论计算结果的准确性。结论对三维MANET网络协议设计具有一定的参考价值。

Link dynamics in MANET based on 3-D SGM mobility model

Existing studies of the link dynamics in Mobile Ad hoc Networks(MANETs) are mainly based on some traditional mobility models,such as Random Direction(RD) model and Random Waypoint(RWP) model etc.For these models,the unrealistic moving behaviors,such as sudden speed change and sharp turn,may invalidate the analytical and simulation results of link dynamics.The 3-D Smooth Gauss-semi-Markov(SGM) mobility model,which can truly reflect the physical law of moving objects in 3-D space,and the Markov chain theory were used to study the link dynamics in 3-D MANET.The analytical expressions for the link breakage probability and the expected link lifetime were derived from the probability density function of the relative velocity and the distance transition probability matrix between two nodes.Finally,the derived expressions were confirmed through simulations.The conclusion is valuable for the design of network protocols in 3-D MANETs.