Handoff prediction by mobility characteristics in wireless broadband networks

The paper proposes mobility-aided resource reservation (MARR) with admission control (AC) to provide better usage of scarce resources in wireless broadband networks. The area of a cell is divided into an outer ring and an inner ring. A target cell is predicted by extrapolating the trajectory of each MS. In order to reduce signaling overhead, bandwidth is reserved only in the target cell as MSs move into the outer ring and leave the serving base station (BS). The amount of bandwidth to be reserved is dynamically adjusted according to the instantaneous variation of mobility ratio, location, and direction of an MS. Two scenarios of the MARR scheme are investigated by OPNET simulation and compared by considering the mobility ratio threshold in the calculation of the direction weighting. Simulation results show that employing the MARR scheme can indeed reduce connection dropping probability, and make better bandwidth utilization when appropriate parameters are chosen.