On Connectivity of Vehicular Wireless Ad hoc Network
Jiang Changjun · Jisuanji fangzhen · 2009
In ITS (Intelligent Transportation Systems), each vehicle is often equipped with an ad hoc node which is used to transmit information on point-to-point communications between vehicles. All these ad hoc nodes compose of a vehicular wireless ad hoc network. From the vehicular wireless ad hoc network for the real road transportation system, reasonable network models were abstracted and the connectivity of the network was discussed by percolation theory. In one-dimension (1-D) network, the characteristic of non-percolation in 1-D mobile wireless networks was proved. Then the method of rationally locating static nodes was proposed to improve the connectivity of 1-D network. Through simulation experiments the reasonable transmission radius of wireless ad hoc nodes in real traffic network was obtained. In two-dimension (2-D) networks, a novel connectivity strategy was introduced, named the point-based coverage strategy. This strategy suits the connectivity of real transportation network. The condition of an area being covered by a certain point in 2-D network was analyzed by percolation theory. Then the simulation shows the connectivity of real traffic network and the characteristic of being covered by the center point of Wujiaochang.