Femtocell has been considered by the wireless\ud industry as a promising solution not only to improve indoor\ud coverage, but also to unload traffic from overburdened macrocell\ud networks. In hybrid macro/femto networks, macrocells may have\ud to share the same spectrum with femtocells, due to spectrum\ud availability and network infrastructure considerations, in spite of\ud potentially excessive interference caused by densely deployed\ud femtocells. In this paper, we propose a decentralized resource\ud allocation scheme for the orthogonal frequency division multiple\ud access (OFDMA) downlink of a shared-spectrum macro/femto\ud network, where each femtocell randomly selects a subset of\ud available OFDMA resources for transmission, in order to achieve\ud decentralized inter-cell interference avoidance. The performance\ud of the decentralized resource allocation scheme is evaluated by\ud simulations based on per-cell or network-wide performance\ud metrics. Simulation results provide insights on how the resource\ud allocation in a shared-spectrum hybrid macro/femto network\ud should take into account the spatial density of femtocells and\ud indoor/outdoor radio propagation channel conditions
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