Energy and spectral efficient mobile relay deployment in relay-aided cellular networks

In this paper, two algorithms are proposed to determine the optimal locations of mobile relay stations (MRSs) in relay-aided cellular networks, aiming at maximizing energy efficiency (EE) while guaranteeing the spectral efficiency (SE) requirement and the signal-to-interference-plus-noise ratio (SINR) constraints of MRSs. First, an interference graph construction method is proposed to calculate the interference of mobile users (MUs) served by MRSs. Then, an optimal as well as a suboptimal deployment algorithms are proposed to find out the optimal locations of MRSs. Simulation results show that the proposed algorithms can considerably improve system throughput. In addition, the proposed deployment algorithms can improve EE, compared with cellular networks without relay stations.