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Abstract: Recently, the explosive growth of data traffic due to ubiquitous smart devices has accelerated the current 4G systems towards further technological evolution. Indeed, we are now moving into the 5G era as we reach for 2020 and beyond. Compared with 4G mobile communications, 5G needs to meet extremely high performance requirements in more diverse scenarios. These requirements are challenging and may even be conflicting, and need the design of new network architectures, new radio access techniques, and new transmission waveforms. In recent years, both academia and industry have shown a lot of interest in the key techniques of 5G systems, such as network framework, massive multiple-input multiple-output (MIMO), full-duplex, physical layer security, device-to-device (D2D), and energy harvesting. However, there are still many technical challenges to overcome before the deployment of 5G networks. Hence, the objective of this special issue is to showcase contributions from both academia and industry to motivate discussions on advanced and innovative techniques for 5G.

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