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Sensors 2018, 18(5), 1572; https://doi.org/10.3390/s18051572

Optimal Resource Allocation for NOMA-TDMA Scheme with α-Fairness in Industrial Internet of Things

1
School of Information and Control Engineering, China University of Mining and Technology, Xuzhou 221116, China
2
School of Communication and Information Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
3
Department of IoT Engineering, Xi’an University of Technology, Xi’an 710048, China
*
Author to whom correspondence should be addressed.
Received: 19 April 2018 / Revised: 27 April 2018 / Accepted: 29 April 2018 / Published: 15 May 2018
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Abstract

In this paper, a joint non-orthogonal multiple access and time division multiple access (NOMA-TDMA) scheme is proposed in Industrial Internet of Things (IIoT), which allowed multiple sensors to transmit in the same time-frequency resource block using NOMA. The user scheduling, time slot allocation, and power control are jointly optimized in order to maximize the system α -fair utility under transmit power constraint and minimum rate constraint. The optimization problem is nonconvex because of the fractional objective function and the nonconvex constraints. To deal with the original problem, we firstly convert the objective function in the optimization problem into a difference of two convex functions (D.C.) form, and then propose a NOMA-TDMA-DC algorithm to exploit the global optimum. Numerical results show that the NOMA-TDMA scheme significantly outperforms the traditional orthogonal multiple access scheme in terms of both spectral efficiency and user fairness. View Full-Text
Keywords: non-orthogonal multiple access; industrial internet of things; α-fair; NOMA-TDMA scheme; NOMA-TDMA-DC algorithm non-orthogonal multiple access; industrial internet of things; α-fair; NOMA-TDMA scheme; NOMA-TDMA-DC algorithm
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Sun, Y.; Guo, Y.; Li, S.; Wu, D.; Wang, B. Optimal Resource Allocation for NOMA-TDMA Scheme with α-Fairness in Industrial Internet of Things. Sensors 2018, 18, 1572.

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