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Resource allocation for downlink non-orthogonal multiple access in joint transmission coordinated multi-point networks
Computer Communications ( IF 2.816 ) Pub Date : 2021-04-07 , DOI: 10.1016/j.comcom.2021.03.025
Mohamad Khattar Awad, Mohammed W. Baidas, Ahmad A. El-Amine

Joint transmission coordinated multi-point (JT-CoMP) and non-orthogonal multiple access (NOMA) are key enabling technologies of 5G ubiquitous broadband infrastructures. These technologies are jointly expected to exploit multi-cell and non-orthogonal resource transmissions; thus, conventional resource allocation schemes that only consider either one of them fail to efficiently exploit resources of 5G networks. In this paper, we bridge this gap by proposing a practical and comprehensive joint sub-carrier assignment and power allocation scheme for network sum-rate maximization in JT-CoMP-enabled NOMA networks. We formulate the problem as a mixed integer non-linear programming (MINLP) problem, which is NP-hard. The problem is decoupled into two sub-problems, where the sub-carrier assignment is modeled as a two-sided many-to-many matching game and the power allocation is formulated as a difference of convex (DC) programming problem. The matching algorithm is proved to converge to a two-sided exchange stable matching. Furthermore, the solution computed by the proposed scheme is verified against a baseline solution computed by a commercial optimization package, and has been shown to achieve 91.38% of the baseline solution for JT-CoMP-NOMA networks. Simulation results illustrate that the proposed scheme enhances cell-edge users’ achievable rates by 0.127.7% in JT-CoMP-NOMA over conventional NOMA.



中文翻译:

联合传输协调多点网络中下行非正交多址接入的资源分配

联合传输协调多点(JT-CoMP)和非正交多址(NOMA)是5G无处不在的宽带基础设施的关键启用技术。预计这些技术将共同利用多小区和非正交资源传输。因此,仅考虑其中之一的常规资源分配方案无法有效利用5G网络的资源。在本文中,我们通过提出一种实用且全面的联合子载波分配和功率分配方案来弥合这一差距,以实现启用JT-CoMP的NOMA网络中的网络总速率最大化。我们将该问题表述为NP难的混合整数非线性规划(MINLP)问题。该问题被分解为两个子问题,其中将子载波分配建模为两边多对多匹配博弈,将功率分配公式化为凸(DC)编程问题。证明了该匹配算法收敛于双向交换稳定匹配。此外,针对商业优化程序包计算出的基准解决方案,验证了由所提出的方案计算出的解决方案,对于JT-CoMP-NOMA网络,该解决方案已显示出达到基准解决方案的91.38%。仿真结果表明,该方案通过以下方法提高了小区边缘用户可达到的速率。针对商业优化程序包计算出的基准解决方案,验证了由所提出的方案计算出的解决方案,对于JT-CoMP-NOMA网络,该解决方案已显示出达到基准解决方案的91.38%。仿真结果表明,该方案通过以下方法提高了小区边缘用户可达到的速率。针对商业优化程序包计算出的基准解决方案,验证了由所提出的方案计算出的解决方案,对于JT-CoMP-NOMA网络,该解决方案已显示出达到基准解决方案的91.38%。仿真结果表明,该方案通过以下方法提高了小区边缘用户可达到的速率。 01个-277 在JT-CoMP-NOMA中优于传统的NOMA。

更新日期:2021-04-16
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