Interference Aware Underlay D2D Multicasting through Effective Use of Under-utilized RBs

Conducting simultaneous transmissions of Device to Device (D2D) multicasting alongside cellular network communications in underlay mode has the potential to enhance spectral efficiency. Such multicasting in underlay mode requires appropriate interference mitigation techniques to maintain the quality of network access services. This is due to the mutual interference between the formulated clusters and the ongoing cellular transmissions. Therefore, appropriate resource allocation is an important research concern. This paper addresses an effective strategy of opportunistic spectrum reuse to admit D2D multicasting in underlay cellular networks. The proposed interference-aware D2D multicasting deals with appropriate resource allocation together with cluster formation through efficient cluster-head (CH) selection. The joint problem is mathematically formulated through integer linear programming (ILP). Considering the hardness of the problem an elegant greedy solution has been proposed. The merit of the proposed solution is established through simulations conducted in NS2 showing acceptable service coverage and network throughput. A comparative study with other well-known approaches is also presented.