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We propose a cellular architecture that combines multiuser MIMO (MU-MIMO)downlink with opportunistic use of unlicensed ISM bands to establishdevice-to-device (D2D) cooperation. The architecture consists of aphysical-layer cooperation scheme based on forming downlink virtual MIMOchannels through D2D relaying, and a novel resource allocation strategy forsuch D2D-enabled networks. We prove the approximate optimality of thephysical-layer scheme, and demonstrate that such cooperation boosts theeffective SNR of the weakest user in the system, especially in the many-userregime, due to multiuser diversity. To harness this physical-layer scheme, weformulate the cooperative user scheduling and relay selection problem using thenetwork utility maximization framework. For such a cooperative network, wepropose a novel utility metric that jointly captures fairness in throughput andthe cost of relaying in the system. We propose a joint user scheduling andrelay selection algorithm, which we prove to be asymptotically optimal. Westudy the architecture through system-level simulations over a wide range ofscenarios. The highlight of these simulations is an approximately $6$ximprovement in data rate for cell-edge (bottom fifth-percentile) users (overthe state-of-the-art SU-MIMO) while still improving the overall throughput, andtaking into account various system constraints.

Enhancing Multiuser MIMO Through Opportunistic D2D Cooperation