Channel Allocation for Multiple D2D-Multicasts in Underlay Cellular Networks using Outage Probability Minimization

Underlay in-band device-to-device (D2D) multicast communication, where same content is disseminated via direct links in a group, has potential to improve the spectral and energy efficiencies of cellular networks. However, existing resource allocation techniques may not work well for multicast in next generation wireless networks with many simultaneously connected devices. To address this problem, we focus on channel allocation algorithms where multiple D2D multicast groups (MGs) share the channel with a cellular user (CU). The objective is to maximize the sum throughput of CUs and D2D multicast groups, while ensuring a certain level of quality of service (QoS) to CUs and D2D MGs. Our main contributions are the exact calculation of outage probability experienced by a D2D receiver in the multicast group and a scheme to share channels among D2D MGs and CUs by minimizing these probabilities. Numerical results demonstrate the impact on the sum throughput of the number of MGs sharing the channel with a CU, geographical spread of MGs, and the maximum transmit power of cellular users.