Analysis on Optimal Configurations of Two-Hop Relay Network

Fixed relay as a candidate solution in the cellular system attracts more and more attention due to its improvements of coverage and capacity. In this paper, we make our study on the optimal configurations of two-hop relay downlink system. Based on former works, two typical resource allocation schemes of the two hops are considered on the assumption of TDD system-one is in time domain and the other is in frequency domain. Based on the improved evaluation model, we demonstrate that it is critical to improve the capacity of the BS to RS link to achieve higher system throughput. Then, different RS positions are discussed in terms of the system throughput and the optimal deployment of Relay Station (RS) is concluded. In addition, we find that the ratio between the transmit power of base station (BS) and that of RS influences the throughput greatly.