An intelligent radio resource management scheme for multi-layered cellularsystems with different assigned bandwidths

This paper proposes an intelligent and autonomous radio resource management scheme for a multi-layered cellular system with different assigned bandwid ths to achieve flexible and high capacity wireless communication systems un der any traffic conditions, especially under nonuniform traffic conditions. In the proposed system, terminals with lower mobility are connected to the wideband microcell systems to achieve higher system capacity, and terminal s with higher mobility are connected to the narrowband macrocell systems to reduce intercell hand-off frequency. To flexibly cope with variations of t raffic conditions, radio spectrum is adaptively and autonomously shared by both systems, and its control is conducted by each microcell base station. Moreover. at the existence of nonuniform traffic conditions, the proposed s ystem introduces downlink power control for the microcells and graceful deg radation thereby achieving high system capacity even under such extraordina ry traffic situations. Computer simulation confirms that the proposed schem e can achieve lower blocking probability than the centralized scheme especi ally under nonuniform traffic conditions.