Femtocell is attracting an increasing interest in the telecommunication sectors. In this paper, we study the efficient resource allocation in femtocell networks with completed closed access method. The interaction between a macrocell and its underlying femtocells is identified, characterized, and qualified. The study answers the fundamental question in the femtocell networks: how to allocate spectrum to the femtocells and their overlaying macrocells subject to the Quality-of-Service (QoS) requirement of femtocell networks. Results indicate that an appropriate spectrum splitting is able to substantially increase the service availability in the macrocells, which is essentially due to the accommodated indoor traffics in the femtocells.
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