Empowering Device-to-Device Device Management
Networks
with
Cross Cross-Link Link
Interference
Abstract: Device-to-device device (D2D) communications is an emerging service model that is currently under standardization by 3GPP. While D2D offloading has a great potential to relieve increasingly congested cellular networks, its benefits, however, come at a cost, namely interference. Most of the prevailing D2D designs conservatively avoid interference via either spectrum resource allocation or power control. These designs, howe however, ver, do not exploit spatial degrees of freedom (DoF), which are inherently supported by multiantenna devices. In this work, we present MD2D, a multiuser D2D system that embraces concurrent D2D transmissions, while leveraging MIMO techniques to actively eliminate eli interference across D2D pairs. MD2D has a systematic methodology that checks whether the antenna combination in a D2D network is capable of eliminating cross-pair pair interference and, thereby, ensuring interference interference-free free concurrent transmissions. If the interference can be eliminated, then MD2D applies a bucketbucket based DoF assignment algorithm to determine an effective antenna usage configuration that handles the interference. We evaluate our design via testbed experiments and large-scale scale simulations. The results show that, as compared to the traditional interference avoidance scheme, MD2D improves the throughput by 87.39 and 218.84 percent in a three three-pair testbed and in large-scale scale simulations, respectively.