Soft FFR Scheme for Distributed D2D Communication in Multicell of Cellular Communication Networks

The increasing demands for multimedia mobile traffics in cellular communication networks have resulted in a massive increase in interests of researchers to increase network capacity and to improve the network quality. Device to Device (D2D) communication has emerged as a promising technology to improve spectral efficiency further. In a conventional cellular network, cellular users or Cellular User Equipment (CUE) communicate with each other through a central coordinator such as a base station (BS) or E node B (eNB). D2D communication allows the users (D2D pair) communicate directly each other without going through eNB. However, enabling D2D communication in the cellular networks cause the interference issues, since D2D devices share the frequency bandwidth with the conventional cellular networks, i.e., in-band D2D. The interference situations become more worse in the multicell scenario of cellular system. This paper proposes a resource allocation method for D2D communication in downlink cellular systems using soft Fractional Frequency Reuse (FFR) scheme. Modeling and simulation have been used to examine the proposed soft FFR in multicell scenario consisting of three cell of macrocell cellular communication networks. Extensive simulation experiment has been carried out and the performance parameters in terms of Signal to Interference plus Noise Ratio (SINR), throughput, and Bit Error Rate (BER) has been measured. The simulation results for soft FFR are compared to the three multicell cellular networks without soft FFR. The simulation results show that the proposed soft FFR can improve the cellular network with a number of D2D pairs deployed. SINR performance achieves 50% improvement with 100 D2D pairs deployed in the cell center of macrocell.