Abstract
Future generations of wireless networks are expected to provide new services with an unprecedented level of diverse and stringent requirements. Fog Radio Access Network (FRAN) and Non-Orthogonal Multiple Access (NOMA) have emerged as complimentary enablers to meet such requirements. On the one hand, FRAN architecture is designed to reduce the delay caused by the fronthaul link by pushing control and storage to the network edge. On the other hand, in addition to increasing the spectral and energy efficiency and the number of connected devices, NOMA has the potential to improve network latency. This paper overviews the joint benefits of enabling NOMA schemes in an FRAN architecture, by means of examining the applicability and adequateness of the NOMA-based FRAN features in achieving specific objectives of next generation of mobile networks, mainly those related to enhanced mobile broadband (eMBB), massive machine type communications (mMTC), and ultra-reliable low latency communication (URLLC). The paper further depicts the challenges and future research directions that must be addressed in order to meet such opportunities.
Highlights
While the commercial deployment of the fifth generation of wireless systems (5G) [1] is at its premises in a number of countries, worldwide research efforts are already turned upon defining Beyond 5G (B5G) systems [2]
Towards achieving the diverse and stringent service requirements envisioned in B5G systems, this overview paper focuses on the potential benefits and technical challenges offered by the integration of Non-Orthogonal Multiple Access (NOMA) technology in the realm of the Fog Radio Access Network (FRAN) architecture
The major motivations and contributions of this paper can be listed as follows: 1) In the sequel, the advantages of NonOrthogonal Multiple Access (NOMA)-based FRAN architecture are presented in light of B5G systems selected use-cases, by advocating how this integration can help achieve the conflicting objectives of enhanced mobile broadband (eMBB), massive machine type communications (mMTC) and ultra-reliable low latency communication (URLLC), 2) We illustrate these potential merits and promising insights through numerical evaluations, 3) Lastly, we identify the main challenges and discuss open research directions in the context of NOMA
Summary
While the commercial deployment of the fifth generation of wireless systems (5G) [1] is at its premises in a number of countries, worldwide research efforts are already turned upon defining Beyond 5G (B5G) systems [2]. Such powerful pool of processors acts as the control plane that handles largescale signal processing, Radio Resource Allocation (RRA), and Interference Management (IM) on a network-wide level. Despite the obvious advantages brought by NOMA, they heavily rely on the receiver’s accurate knowledge of the involved CSIs, as imperfect CSI may incur severe error propagation during SIC decoding This problem, is largely mitigated by superimposing only a few messages within each radio resource unit, which is why most NOMAbased schemes consider only two user messages, thereby hitting a reasonable trade-off between NOMA performance gain and receiver complexity [9]. This paper examines the applicability and adequateness of NOMA-based FRAN features for realizing the prevailing B5G use cases, mainly those related to enhanced mobile broadband (eMBB), massive machine type communications (mMTC), and ultra-reliable low latency communication (URLLC)
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