  In the wake of growth in intelligent mobile devices and wide usage of
bandwidth-hungry applications of mobile Internet, the demand of wireless data
traffic and ubiquitous mobile broadband is rapidly increasing. On account of
these developments, the research on fifth generation (5G) networks presents an
accelerative tendency on a global scale. Edge computing draw lots of attention
for reducing the time delay and improving the Quality of Service for the
networks. While, fog radio access networks (F-RANs) is an emergent
architecture, which takes full use of edge computing and distributed storing
capabilities in edge devices. In this article, we propose an architecture of
non-orthogonal multiple access (NOMA) based F-RANs, which has a strong
capability of edge computing and can meet the heterogeneous requirements in 5G
systems. NOMA with successive interference cancellation (SIC) is regarded as a
critical multi-user access technology. In NOMA, more than one user can access
the same time, code domain, and frequency resources. With assigning different
power levels to multi-user and implementing SIC, multiple users detection can
be achieved. In this article, we provide a description of the NOMA based F-RANs
architecture, and discuss the resource allocation in that. We will focus on the
power and subchannel allocation in consideration of using NOMA and the edge
caching. Simulation results show that the proposed NOMA baesd F-RANs
architecture and the resource management mechanisms can achieve the high net
utility for the RANs.
