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Multi-hop relaying in WiMAX networks is considered a cost effective way to extend the coverage of the base stations, increase cell capacity, or both. In this paper, the authors consider deploying non-transparent relay stations for coverage extension and study the issue of fairness schemes in such networks. Since there are accesses and relay zones in both downlink and uplink frames and simultaneous transmissions are possible in the access zone, it is challenging to schedule resources optimally for serving subscriber stations in a fair manner. They evaluate the performance of well known fairness schemes such as max-min and proportional fairness in such networks. They also propose a new scheduling scheme, named subsection fairness that can achieve better throughput than traditional fairness schemes by maximizing bandwidth utilization.
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