Design aspects of satellite-cellular hybrid wireless systems

In this paper, we investigate various issues related to the design of satellite-cellular hybrid systems. First, we review the fundamental problems of channel partitioning and call admission/assignment. Second, we study the impact of di erent frequency reuse constraints, in both layers, on the optimum channel partitioning. Third, we investigate, analytically and via simulation, the e ect of reducing the cell size. We emphasize the blocking-forced termination probabilities trade-o for pure cellular and satellite-cellular hybrid systems. Accordingly, an optimization problem with respect to the cell size is formulated. Finally, we search for the optimum dynamic call re-assignment policy that "This work was supported by the Center for Satellite & Hybrid Communication Networks, a NASA Commercial Space Center (CSC) at the University of Maryland, under NASA Cooperative Agreement NCC3-528." improves the system capacity at the expense of the complexity associated with tearing down a connection in one system and setting-up an alternative one in the other system. For a small hybrid system, we characterized the optimum re-assignment policies that minimize the blocking probability, dropping probability, and a weighted cost function of these probabilities.