Novel radio resource management schemes for best-effort service in OFDMA systems

In this paper, we propose a complete radio resource management procedure for best-effort (BE) service in OFDMA systems, which improves the system fairness with graceful throughput degradation compared to the derived analytical upper bound of the system throughput. By the proposed bandwidth and power allocation algorithms, the user in the worst channel environment has almost the same probability of accessing the system as the user in the best channel environment. Furthermore, a novel sub-channel allocation algorithm is proposed, to exploit frequency selectivity and multi-user diversity gains simultaneously in OFDMA systems. The proposed sub-channel allocation algorithm shows favorable throughput enhancement over the conventional algorithms in frequency-selective fading channel.