Hybrid resource allocation scheme in two-hop relaying WiMAX networks

In this paper, we consider resource allocation schemes in two-hop relaying WiMAX networks in order to maximize cell throughput, while serving the subscriber stations (SSs) in a fair manner. First we present two well-known schemes, namely, orthogonal and overlapped, according to the frequency reuse during the access zone intervals of downlink and uplink subframes. We then propose a hybrid resource allocation scheme to harmonize the orthogonal and overlapped schemes in order to improve the efficiency of resource utilization while minimizing interference. We evaluate the performance of our proposed hybrid scheme by comparing it with the optimal scheduling scheme as well as the orthogonal and overlapped schemes, in terms of cell throughput, outage rate, and computation time. The numerical results show that the proposed hybrid scheme achieves a higher throughput than the overlapped scheme while maintaining as low an outage rate as orthogonal scheme. In addition, the computational time is significantly less than the optimal scheme at the expense of minimal throughput degradation.