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.