Joint user association and resource allocation for cost-efficient NOMA-enabled F-RANs

Integrating Non-Orthogonal Multiple Access (NOMA) into Fog Radio Access Networks (F-RANs) has shown to be effective in boosting the spectral efficiency, energy efficiency, connectivity, and reducing the latency, thus attracting significant research attention. However, the performance improvement of...

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Bibliographic Details
Published in:	Digital communications and networks Vol. 10; no. 6; pp. 1686 - 1697
Main Authors:	Ai, Yuan, Liu, Chenxi, Peng, Mugen
Format:	Journal Article
Language:	English
Published:	Elsevier B.V 01.12.2024 KeAi Communications Co., Ltd
Subjects:	Fog radio access networks Non-orthogonal multiple access (NOMA) Resource allocation Non-orthogonal multiple access (NOMA) Fog radio access networks Resource allocation
ISSN:	2352-8648, 2352-8648
Online Access:	Get full text
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Summary:	Integrating Non-Orthogonal Multiple Access (NOMA) into Fog Radio Access Networks (F-RANs) has shown to be effective in boosting the spectral efficiency, energy efficiency, connectivity, and reducing the latency, thus attracting significant research attention. However, the performance improvement of the NOMA-enabled F-RANs is at the cost of computational overheads, which are commonly neglected in their design and deployment. To address this issue, in this paper, we propose a hybrid dynamic downlink framework for NOMA-enabled F-RANs. In this framework, we first develop a novel network utility function, which takes both the network throughput and computational overheads into consideration, thus enabling us to comprehensively evaluate the performance of different access schemes for F-RANs. Based on the developed network utility function, we further formulate a network utility maximization problem, subject to practical constraints on the decoding order, power allocation, and quality-of-service. To solve this NP-hard problem, we decompose it into two subproblems, namely, a user equipment association and subchannel assignment subproblem and a power allocation subproblem. Three-dimensional matching and sequential convex programming-based algorithms are designed to solve these two subproblems, respectively. Through numerical results, we show how our proposed algorithms can achieve a good balance between the network throughput and computational overheads by judiciously adjusting the maximum transmit power of fog access points. We also show that the proposed NOMA-enabled F-RAN framework can increase, by up to 89%, the network utility, compared to OMA-based F-RANs.
ISSN:	2352-8648 2352-8648
DOI:	10.1016/j.dcan.2023.08.001