Resource Allocation Scheme Based on Load Balancing for OFDMA Two-Hop Relay Networks

In order to accommodate different user distributions in cells,a resource allocation scheme based on load balancing(RALB) was proposed for OFDMA(orthogonal frequency division multiple access)-based two-hop relay networks(TRNs).Because of the difficulty to solve a joint optimization problem,a step-by-step suboptimal allocation scheme was provided under the precondition of reducing the computational complexity.The proportional fair algorithm was adopted to allocate sub-channels,and the math modeling for power allocation algorithm was introduced.Based on the convex optimization and the water-filling algorithm,the conditions to satisfy the optimal power allocation solution were determined,and the transmission powers of base station and relay stations were calculated for approaching the optimal solution.Extensive simulations demonstrate that compared with the traditional static resource allocation(SRA),the proposed RALB is adaptable to different user distributions and channel conditions and improves the system throughput by more than 7.8%.

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