ce across time and space. New business models and economic incentives with fundamental shift in cost, energy, and operational efficiency are expected to make 5G feasible and sustainable. 5G also is going to offer value proposition to vertical businesses and consumers through the defi- nition and exposure of capabilities that enhance today's overall service delivery. In addition to supporting the evolution of the established mobile broadband usage models, 5G is going to support numerous emerging applications with widely different requirements and service attributes; that is, from delay-tolerant applications to ultra-low-latency applica- tions, from high-speed scenarios in trains/airplanes to nomadic/stationary scenarios in home or office, and from best effort applications to ultra-reliable applications such as in health- care and public safety. Furthermore, content and information will be delivered across a wide range of devices (e.g., smartphones, wearables) and through heterogeneous environ- ments. Fulfilling such stringent requirements will require larger number of base stations/ access nodes in the form of a heterogeneous network architecture, which can be realized as small cells and high-capacity cloud-RAN or virtual RAN architectures serving a large num- ber of remote radio heads. Content caching and processing at the cloud edge in 5G networks will overcome bottlenecks in the network transport for delay-sensitive applications. 5G use cases and business models require allocation of additional spectrum for mobile broadband and flexible spectrum management capabilities. The new networks are employ- ing a set of new frequency bands (licensed, unlicensed, and shared) to supplement the exist- ing wireless frequencies, enabling larger bandwidth operation and substantially improved capacity. 5G inevitably requires some of the sub-6 GHz spectrum to be repurposed for deployment of the new technologies. Existing cellular bands can be augmented with new spectrum allocations above 6 GHz in order to create extremely wider