Device-to-device interference avoidance underlaying cellular downlink transmission

Device-to-Device communication (D2D) is a proximity based technique in Long Term Evolution-Advanced (LTE-A) systems. This technique can improve system throughput, but also may cause heavy intra-cell interference. In downlink transmission, the Base Station (BS) severely interferes with D2D pairs while D2D pairs reusing resources of cellular users. Therefore, D2D transmitters have to raise their power to achieve an acceptable threshold of Signal to Interference plus Noise Ratio (SINR). However, interference from D2D pairs to cellular users becomes more serious due to this raising. We model this spectrum sharing into an interference-bounded resource allocation problem, and propose a heuristic scheme to efficiently solve the problem. The simulation results show that throughput of the proposed scheme is close to the optimal´s, and the interference between CUEs and D2D pairs as well as between D2D pairs can be controlled in a given threshold.