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In this paper, the authors consider the frequency reuse issue in the downlink of a multi-cell OFDMA system. They first implement the static frequency reuse scheme in the OFDMA sub-carrier assignment over the multi-cell system in order to control the inter-cell interference. Then, they add the random access sub-band to adopt the dynamic frequency reuse. The main purpose of introducing the random access sub-band is to improve the fairness of the system. In order to efficiently share the random access sub-band over the multi-cell sectors, the sector load information is considered. They assume that there is only a minimal coordination between the sectors so the central network controller provides only the access probabilities to each cell.
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