Multi-Cell Coordinated Radio Resource Management Scheme Using a Cell-Specific Sequence in OFDMA Cellular Systems

In this paper, we propose a multi-cell coordinated radio resource management scheme in OFDMA cellular systems, in which each cell has its own sequence for allocating radio subchannels. We first divide a given radio resource into a set of subchannels in each cell. Here, we assume an identical set of subchannels in all cells considered. Then, we choose a set of cell-specific subchannel allocation sequences, so that they can avoid maximally inter-cell interference (ICI) and also minimize the probability of major collisions from neighbor cells in a mobile cellular environment. Finally, each cell allocates a subset of pre-defined subchannels to a requested user. In addition, prior to resource scheduling, each base station (BS) determines the total number of subchannels requested by all users in the cell, and allocates subchannels corresponding to the requested number according to its own cell-specific sequence. Through simulation results, we show that the proposed scheme can achieve a greater spectral efficiency or much higher loading under system outages as compared to the conventional schemes. We consider both the omni-cell and 3-sector cell