[Show abstract][Hide abstract] ABSTRACT: As the enormous development of IT technology, the convergence technology enlarges its research areas. Recently, OFDMA which was widely used in satellite and wireline communications is applied to broadband wireless communication systems. In order to employ the OFDMA to next generation mobile systems, throughput maximization and power efficient control mechanism is needed. This paper proposes the multi- level scheme for the power efficient feedback of channel state information without degrading system performance. Also, we propose a sub-optimal resource allocation scheme based on a greedy algorithm which guarantees fairness with reduced complexity. Proposed scheme is evaluated by system level simulation which uses a spatial channel model and the results show that the proposed scheme follows proportional fair throughput and reduces signaling overheads for feedback. 1
[Show abstract][Hide abstract] ABSTRACT: The traffic state control scheme is a radio resource management (RRM) technique which optimizes the use of radio resources and reduces the mobile's power consumption. In this paper, we propose an efficient traffic state control scheme which is based on the three-state model. It exploits utilization of limited radio resources by dynamically switching mobile states. We evaluate the performance of traffic state control schemes on a packet based wireless OFDMA system. The simulation result shows that proposed scheme provides efficient resource allocation in overloaded system.