运动对无线Ad Hoc网络中保持连通的临界传输半径的影响

Effect of mobility on the critical transmitting range for connectivity in wireless Ad Hoc networks

为了研究如何选择移动Ad Hoc网络保持连通的临界传输半径,定义了反映随机路点运动模型对临界传输半径影响的本质参量停留概率.该参量反映了网络趋于静止的趋势,并由更新理论推导出停留概率与随机路点运动模型的运动参数停留时间,最小速度和最大速度之间的关系式.仿真结果表明,运动参数通过本质参量停留概率而影响临界传输半径.给定运动参数,便可确定停留概率,如果停留概率小于0.5,运动时的临界传输半径比静止时大10%,否则二者可近似认为相等.

The effect of mobility on the critical transmitting range in wireless Ad Hoc networks is discussed. A new parameter-the pause probability of the random waypoint mobility model （RWP） which is the deterministic parameter of the effect of mobility on the critical transmitting and reflects the stationary trend of the network is defined. And the function of the relationship of the pause probability to the minimum velocity, the maximum velocity and the pause time of RWP is derived. Simulation results show that mobility affects the critical transmitting range by pause probability. If pause probability is smaller than 0. 5, the critical transmitting range of mobile networks is 10% larger than that of stationary networks, or it equals that of a stationary one approximately.