A Novel Semi-Markov Smooth Mobility Model for Mobile Ad Hoc Networks

Existing random mobility models have their limitations such as speed decay and sharp turn which have been demonstrated by the previous studies. More importantly, mobility models need to mimic the movements that abide by the physical law for accurate analysis and simulations of mobile networks. Therefore, in this paper, we propose a novel mobility model, SemiMarkov Smooth (SMS) model. Each SMS movement includes three consecutive phases: Speed Up phase, Middle Smooth phase, and Slow Down phase. Thus, the entire motion in the SMS model is smooth and consistent with the moving behaviors in real environment. Through steady state analysis, we demonstrate that SMS model has no average speed decay problem and always maintains a uniform spatial node distribution. The analytical results are validated by extensive simulation experiments. In addition, we compare the simulation results on link lifetime and percentage of node degree with Random Waypoint model, GaussMarkov model and the proposed SMS model.