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 different frequency reuse constraints, in both layers, on the optimum channel partitioning. Third, we investigate, analytically and via simulation, the effect of reducing the cell size. We emphasize the blocking-forced termination probabilities trade-off 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