QoS provisioning scheduling with joint optimization of base station and relay power allocation in cooperative OFDMA systems

Most existing works on scheduling for cooperative OFDMA systems have focused on homogeneous users with the same service and demand. Although scheduling for service differentiated cooperative OFDMA systems have been discussed in some previous works, their schedule problems do not take the joint optimization of base-station and relay power into account. In this paper, we investigate the optimization problem for joint base-station and relay power allocation, relay selection and subcarrier assignment with QoS guarantees and service support. We formulate the QoS provisioning joint schedule problem as a Mixed Binary Integer Program (MBIP). By introducing power and QoS prices, this MBIP is transformed into its corresponding dual problem, and a two-level dual decomposition method is proposed to solve the problem. Simulation results demonstrate that our proposed method outperforms previous works in terms of spectrum efficiency and QoS satisfaction.