Journal of Applied Sciences1812-56541812-5662Asian Network for Scientific Information10.3923/jas.2007.442.450KhiderIbrahim FurongWang HuaYin Wei Sacko 3200773In this study, we present and visit the limitation of Random mobility model, the unconstraint motion of mobile node. Mobile nodes, in the Random Waypoint and Random walk mobility models, are allowed to move freely and randomly anywhere in the simulation field. However, in most real life applications, we observe that a node’s movement is subject to the environment. In particular, the motions of vehicles are bounded to the freeways or local streets in the urban area and on campus the pedestrians may be blocked by the buildings and other obstacles. Therefore, the nodes may move in a pseudo-random way on predefined pathways in the simulation field. Some recent works address this characteristic and integrate the paths and obstacles into mobility models. We call this kind of mobility model a mobility model with geographic restriction.]]>Bai, F., N. Sadagopan and A. Helmy,2003De Berg, M., M. van Kreveld, M. Overmars and O. Schwarzkopf,2008Bittner, S., W.U. Raffel and M. Scholz,2005Broch, J., D.A. Maltz, D.B. Johnson, Y.C. Hu and J. Jetcheva,1998Camp, T., J. Boleng and V. Davies,2002Jardosh, A., E.M. Belding-Royer, K.C. Almeroth and S. Suri,2003Johansson, P., T. Larsson, N. Hedman, B. Mielczarek and M. Degermark,1999Kim, J.,2005Kraaier, J. and U. Killat,2005Tian, J., J. Hahner, C. Becker, I. Stepanov and K. Rothermel,2002