CoRAL: Coordinated Resource Allocation for Intercell D2D Communication in Cellular Networks

For efficient spectrum utilization, the licensed band of cellular network is used for Device-to-Device (D2D) commu-nication. Reuse of resource blocks (RBs) in D2D links creates interference to cellular users (CUs) and the interference becomes severe when D2D transmitters and receivers are connected with different cells. However, minimization of both intracell and inter-cell interference is a challenging task while realizing intercell D2D communication. In this paper, we propose a resource allocation scheme, named CoRAL, where the neighbor base stations (BSs) coordinate between themselves to minimize the interference caused by the D2D communication. Each base station computes a look-up table (L UT), comprising the degradation in throughput for each RB. The coordination between the serving BS (S-eNB) and its neighbor BSs (N-eNBs) is obtained by sharing the LUTs. The S-eNB combines all the LUTs and forms an updated table, which is used for the resource allocation algorithm. We formulate the resource allocation problem as a minimization problem of the degradation of achieved throughput due to sharing of RBs between D2D users and CUs in the system. CoRAL enhances the system throughput by minimizing the intra and intercell interference simultaneously in the presence of D2D communication. It uses an iterative approach for allocating RBs to D2D users. The simulation results show that CoRAL outperforms the uncoordinated resource allocation techniques where a single base station decides the resource assignment procedure and a popular scheme GALLERY from existing literature.