Mobility Prediction and Resources Reservation in WLAN Networks Under a 2D Mobility Model

This papers presents a 2D reservation scheme in WLAN environment. A two-dimensional wireless mobility model called smooth random mobility model (SRMM) has been considered, because it makes the movement of users smoother and more realistic than well-known in literature random mobility models. A general prediction technique based both on the analysis of cell stay time and on the direction probabilities of hand-in and hand-out events of mobile nodes from wireless cells is outlined. Three different reservation policies are considered: the first scheme reserves a fixed number of cells for each hand-off; the second one permits to reserve on a greater number of cells in the first hand-off and a lower number of cells in the next hand-off events; the last policy uses an increasing adaptive reservation scheme, trying to take advantage of the lower prediction error for the first hand-off and the greater prediction error for the next hand-off. Many simulations have been carried out and a comparison between the three reservation schemes has been performed.