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Hierarchical Cellular Networks (HCNs), in which femtocells are deployed in the coverage of a conventional macrocell, offer a cost effective solution to achieve high user capacity and extended service coverage. Since a large number of femtocells can be installed by users without cell planning, interference between macro-cells and femtocells causes a severe problem. Especially, the macro MS which is located near femtocells or transmits uplink data with large power may make strong uplink interference to neighbor femtocells. This uplink interference results in decreasing the system capacity of femtocells. In this paper, the authors propose novel resource allocation schemes which minimize the uplink interference from macro MSs to femtocells in TDMA (Time Division Multiple Access) based HCNs.
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