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 cell-edge 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.