Clustering and power control for reliability improvement in Device-to-Device networks

In this paper, a joint clustering and power control scheme for orthogonal frequency division multiple access (OFDMA) system is proposed in Device-to-Device networks. To improve the reliability of D2D communication, the proposed scheme consists of two phases. In the first phase, an interference management scheme is proposed based on clustering in order to guarantee the outage probability of D2D communications is less than its target. A cluster is taken as the unit for frequency reuse among D2D pairs. The problem of clustering is mapped to the MAX k-CUT problem in graph theory and is solved by graph-based heuristic algorithm. The maximum cluster size is derived on the basic of outage probability. In the second phase, a power control scheme is proposed in order to eliminate the co-channel interference intra-cluster. We propose an expected transmission scale function Z as a measure. Therefore, the above power control problem would be mapped to maximizing function Z. Simulations demonstrate the superior performance of the proposed solution compared with the existing scheme.