Joint subchannel assignment and power control in OFDMA in‐band full‐duplex heterogeneous networks,Transactions on Emerging Telecommunications Technologies

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Joint subchannel assignment and power control in OFDMA in‐band full‐duplex heterogeneous networks
Transactions on Emerging Telecommunications Technologies ( IF 2.5 ) Pub Date : 2020-06-24 , DOI: 10.1002/ett.4001
Hamed Rajabi ₁ , Mehdi Rasti ₁ , Hossein Pedram ₁ , Rohollah Yousefpour ₂

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Among the emerging technologies for the fifth‐generation (5G) cellular networks, in‐band full‐duplex (FD) wireless communication and heterogeneous networks (HetNets) are two promising technologies, which can significantly improve the network capacity. Due to self‐interference (SI) and multiple sources of intercell interference, base station (BS)‐BS interference and user equipment (UE)‐UE interference in FD HetNets, interference management is a significant and challenging issue in such a network. To this end, in this article, we study the joint subchannel assignment and power control problem in the OFDMA FD HetNet. The joint subchannel assignment and power control problem in this network is formulated as an optimization problem to maximize the uplink and downlink sum throughput of the femtocell user equipments (FUEs) taking into account the maximum interference constraint imposed on the macrocell user equipments (MUEs) and the minimum throughput constraint of FUEs. Since the formulated problem is a nonconvex and intractable mixed integer nonlinear programming (MINLP) problem, we invoke variable change and linear approximation to reformulate and convert the problem into a tractable mixed‐integer linear programming (MILP) problem. Numerical results show that the optimal solution of the new MILP problem is very close to the optimal objective value of the original MINLP problem. The results also demonstrate that in an OFDMA FD HetNet, when all the UEs and the BSs are FD, approximately 50% improvement in the network throughputcan be achieved compared with a half‐duplex HetNet.

中文翻译：

OFDMA带内全双工异构网络中的联合子信道分配和功率控制

在第五代（5G）蜂窝网络的新兴技术中，带内全双工（FD）无线通信和异构网络（HetNets）是两项有前途的技术，可以显着提高网络容量。由于FD HetNets中的自干扰（SI）和小区间干扰，基站（BS）-BS干扰和用户设备（UE）-UE干扰的多种来源，因此在此类网络中，干扰管理是一个重大且具有挑战性的问题。为此，在本文中，我们研究了OFDMA FD HetNet中的联合子信道分配和功率控制问题。该网络中的联合子信道分配和功率控制问题被表述为优化问题，以考虑到对宏小区用户设备（MUE）和最大用户设备施加的最大干扰约束，从而使毫微微小区用户设备（FUE）的上行链路和下行链路总吞吐量最大化。 FUE的最小吞吐量限制。由于公式化的问题是非凸且难于处理的混合整数非线性规划（MINLP）问题，因此我们调用变量更改和线性逼近来重新表述并将其转换为可解决的混合整数线性规划（MILP）问题。数值结果表明，新的MILP问题的最优解与原始MINLP问题的最优目标值非常接近。结果还表明，在OFDMA FD HetNet中，

更新日期：2020-06-24

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