Resource Allocation in the RIS Assisted SCMA Cellular Network Coexisting With D2D Communications

Yukai Liu; Wen Chen; Hongying Tang; Kunlun Wang

doi:10.1109/ACCESS.2023.3269284

IEEE Access (Jan 2023)

Resource Allocation in the RIS Assisted SCMA Cellular Network Coexisting With D2D Communications

Yukai Liu,
Wen Chen,
Hongying Tang,
Kunlun Wang

Affiliations

Yukai Liu: ORCiD; Department of Electronic Engineering, Shanghai Institute of Advanced Communications and Data Sciences, Shanghai Jiao Tong University, Shanghai, China
Wen Chen: ORCiD; Department of Electronic Engineering, Shanghai Institute of Advanced Communications and Data Sciences, Shanghai Jiao Tong University, Shanghai, China
Hongying Tang: ORCiD; Science and Technology on Microsystem Laboratory, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai, China
Kunlun Wang: ORCiD; School of Communication and Electronic Engineering, East China Normal University, Shanghai, China

DOI: https://doi.org/10.1109/ACCESS.2023.3269284
Journal volume & issue: Vol. 11
pp. 39978 – 39989

Abstract

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The cellular network coexisting with device-to-device (D2D) communications has been studied extensively. Reconfigurable intelligent surface (RIS) and non-orthogonal multiple access (NOMA) are promising technologies for the evolution of 5G, 6G and beyond. Besides, sparse code multiple access (SCMA) is considered suitable for next-generation wireless network in code-domain NOMA. In this paper, we consider the RIS-aided uplink SCMA cellular network simultaneously with D2D users. We formulate the optimization problem which aims to maximize the cellular sum-rate by jointly designing D2D users’ resource block (RB) association, the transmitted power for both cellular users and D2D users, and the phase shifts at the RIS. The power limitation and users’ communication requirements are considered. The problem is non-convex, and it is challenging to solve it directly. To handle this optimization problem, we propose an efficient iterative algorithm based on block coordinate descent (BCD) method. The original problem is decoupled into three subproblems to solve separately. Simulation results demonstrate that the proposed scheme can significantly improve the sum-rate performance over various schemes.

Published in IEEE Access

ISSN: 2169-3536 (Online)
Publisher: IEEE
Country of publisher: United States
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering
Website: https://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=6287639

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