The evolution of conventional wireless communication networks to the fifthgeneration (5G) is driven by an explosive increase in the number of wirelessmobile devices and services, as well as their demand for all-time andeverywhere connectivity, high data rates, low latency, high energy-efficiencyand improved quality of service. To address these challenges, 5G relies on keytechnologies, such as full duplex (FD), device-to-device (D2D) communications,and network densification. In this article, a heterogeneous networkingarchitecture is envisioned, where cells of different sizes and radio accesstechnologies coexist. Specifically, collaboration for spectrum access isexplored for both FD- and cognitive-based approaches, and cooperation amongdevices is discussed in the context of the state-of-the-art D2D assistedcommunication paradigm. The presented cooperative framework is expected toadvance the understandings of the critical technical issues towards dynamicspectrum management for 5G heterogeneous networks.
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