Joint power and subchannel allocation in relay aided multi-cell OFDMA networks

In this paper, a joint power and subchannel allocation strategy is investigated for relay-aided multi-cell OFDMA networks. The problem is formulated for maximizing the network throughput with minimal bandwidth cost under the users´ minimum rate constraints. The method of Benders´ Decomposition is employed to decompose the complicated problem into two subproblems, which solves the subchannel and power allocation issues separately. The low-complexity algorithms for two sub-problems are developed to allocate the subchannel and power adaptively. Simulation results show that the algorithm converges and benefits higher throughput and spectral efficiency.