毫米波NR-U和WiGig共存：联合用户调度、波束协调和功率控制
Millimeter-Wave NR-U and WiGig Coexistence: Joint User Grouping, Beam Coordination and Power Control
摘要：
毫米波（mmWave）通信是一种很有前途的非授权新无线电（NR-U）技术，以满足未来无线网络中不断增长的数据速率和连接性要求。然而，NR-U网络的发展应考虑与现有的无线千兆（WiGig）网络的共存。在本文中，我们介绍了一种新的多输入多输出非正交多址接入（MIMO-NOMA）的毫米波NR-U和WiGig共存网络的上行链路传输。我们提出的共存网络的目标是最大限度地提高频谱效率，同时确保严格的NR-U延迟要求和WiGig传输性能在实时环境中。提出了一种联合用户分组、混合波束协调和功率控制的策略，该策略是基于李雅普诺夫优化的混合整数非线性规划（MINLP），具有单位模和非凸耦合约束。因此，我们引入了一个惩罚对偶分解（PDD）框架，它首先将MINLP转化为一个易于处理的增广拉格朗日（AL）问题。之后，我们结合凹凸程序（CCCP）和不精确块坐标更新（BCU）方法近似分解的AL问题成多个嵌套的凸子问题，可以迭代求解PDD框架下。数值实验结果表明，该策略能够有效地改善网络性能，并在保证NR-U业务时延和WiGig网络性能方面取得了较好的效果。
英文摘要：
Millimeter wave (mmWave) communication is a promising New Radio in Unlicensed (NR-U) technology to meet with the ever-increasing data rate and connectivity requirements in future wireless networks. However, the development of NR-U networks should consider the coexistence with the incumbent Wireless Gigabit (WiGig) networks. In this paper, we introduce a novel multiple-input multiple-output non-orthogonal multiple access (MIMO-NOMA) based mmWave NR-U and WiGig coexistence network for uplink transmission. Our aim for the proposed coexistence network is to maximize the spectral efficiency while ensuring the strict NR-U delay requirement and the WiGig transmission performance in real time environments. A joint user grouping, hybrid beam coordination and power control strategy is proposed, which is formulated as a Lyapunov optimization based mixed-integer nonlinear programming (MINLP) with unit-modulus and nonconvex coupling constraints. Hence, we introduce a penalty dual decomposition (PDD) framework, which first transfers the formulated MINLP into a tractable augmented Lagrangian (AL) problem. Thereafter, we integrate both convex-concave procedure (CCCP) and inexact block coordinate update (BCU) methods to approximately decompose the AL problem into multiple nested convex subproblems, which can be iteratively solved under the PDD framework. Numerical results illustrate the performance improvement ability of the proposed strategy, as well as demonstrate the effectiveness to guarantee the NR-U traffic delay and WiGig network performance.
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