RIS-Assisted Resource Allocation under Base Stations' Non-Cooperation Scheme
RIS-Assisted Resource Allocation under Base Stations' Non-Cooperation Scheme
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DOI：
10.1109/globecom54140.2023.10437328
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发表时间：
2023-12
期刊：
影响因子：
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通讯作者：
Xinyi Lin;Ziyi Zhou;Lei Zhang;Anvar Tukmanov;Q. Abbasi;M. Imran
中科院分区：
文献类型：
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作者：
Xinyi Lin;Ziyi Zhou;Lei Zhang;Anvar Tukmanov;Q. Abbasi;M. Imran
在本文中，我们专注于可重构智能表面（RIS）辅助资源分配下的基站（BS）的非合作计划，其中RIS是由一个BS单独控制，不应该影响相邻BS的通信。考虑了由RIS辅助BS服务的用户的最小服务质量（QoS）、对相邻BS的信道质量的最小影响、子信道分配规则和总发射功率约束。基于这些约束条件，通过联合优化RIS无源波束形成、功率分配和子信道分配，最大化RIS辅助BS服务的用户的和速率。为了解决非凸问题，开发了一种利用块坐标下降（BCD）技术的有效算法。首先采用双边匹配（TSM）算法求解离散子信道分配优化问题。然后迭代优化功率分配和RIS无源波束形成。针对功率分配和RIS波束形成优化过程中的非凸性问题，分别采用了逐次凸上界逼近法和基于泰勒级数逼近的多比率分数规划逐次相消算法（SCA）。仿真结果的收敛性证明了该算法的有效性，并研究了RIS阵元数和总发射功率对算法性能的影响。
In this paper, we focus on reconfigurable intelligent surface (RIS)-aided resource allocation under base stations (BSs)‘ non-cooperation scheme, where the RIS is solely controlled by one BS and should not affect the communication of the adjacent BS. The minimum quality-of-service (QoS) of users served by the RIS-aided BS, minimum effects on the channel quality of the adjacent BS, the sub-channel assignment rule, and the total transmit power constraint are taken into account. Based on these constraints, the sum-rate of users served by the RIS-aided BS is maximized by jointly optimizing the RIS passive beamforming, power allocation, and sub-channel assignment. To tackle the non-convex problem, an efficient algorithm exploiting the techniques of block coordinate descent (BCD) is developed. A two-sided matching (TSM) algorithm is firstly applied to solve the discrete sub-channel assignment optimization. Then the power allocation and RIS passive beamforming are optimized iteratively. To address the non-convexity in optimizing the power allocation and RIS beamforming, a successive convex upper bound approx-imation method and a multi-ratio fractional programming (FP) with Taylor series approximation-based successive cancellation algorithm (SCA) are used, respectively. The convergence of simulation results proves the validity of our proposed algorithm, and the effects of the numbers of RIS elements and the total transmit power are studied.