On Relay Placement Schemes for Multi-cell LTE-A System Under Co-channel Interference

Due to the frequency reuse, LTE-A is interference limited system, the small rates can only been obtained by celledge users. Cooperative communication through using relays is an efficient approach to resolve this problem. In this paper, We proposed a dynamic relay placement scheme to maximize either the total cell capacity or the total cell-edge user capacity in a LTE-A network under co-channel interference. Two strategies, Amplify-and-Forward (AF) and Decode-and-Forward (DF) for cell-edge user are compared. The simulation results show adding relays and optimizing relays position in the cell can significantly increase the capacity for the cell-edge users. The performance of AF strategy is better than the performance of the DF strategy for cell-edge users. The result of simulations prove that this approach can ensure a fair capacity distribution over the cell.