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Power control for CDMA macro-micro cellular system

The hierarchical cell structure is needed for different requirements: large cells guarantee continuous coverage, while small cells are necessary to achieve good spectrum efficiency and high capacity. In this paper, the CDMA system in macro/micro cell structure is investigated. We propose an adaptive scheme of controlling the cell size according to a time-varying traffic distribution in a macro/micro overlaid cell environment. This aims to bring the communications quality in both the macro-cell and micro-cell to a target quality level. Simulation results show that the proposed scheme effectively controls the time-varying traffic fluctuations and provides an enhanced performance.