In-Band Full-Duplex Dynamic Spectrum Sharing in Beyond 5G Networks
In-Band Full-Duplex Dynamic Spectrum Sharing in Beyond 5G Networks
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DOI：
10.1109/mcom.001.2000929
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发表时间：
2021-07-01
影响因子：
11.2
通讯作者：
Ratnarajah, Tharmalingam
中科院分区：
文献类型：
--
作者：
Biswas, Sudip;Bishnu, Abhijeet;Ratnarajah, Tharmalingam
动态频谱共享（DSS）最近引起了全球监管机构的浓厚兴趣，作为克服5G网络后频谱稀缺的关键策略。在美国，联邦通信委员会已经针对由频谱接入系统（SAS）管理的公民宽带无线电服务（CBRS）频带采用了三层DSS模型，以与商业蜂窝宽带应用共享现有者的频谱。在这篇文章中，我们首先提出了目前的DSS方法及其局限性的调查，然后讨论在DSS网络中使用带内全双工（IBFD）技术的好处。为了说明IBFD辅助CBRS中优先接入许可（PAL）和一般授权接入（GAA）用户的性能的改进，我们考虑CBRS移动的宽带网络（MBN）架构，其包括MIMO雷达系统形式的现任者和由PAL和GAA用户组成的IBFD MIMO MBN。特别是，我们设计联合波束形成器在MBN，在MBN的发射功率和雷达系统的检测概率的约束，和波束形成器在雷达系统，以减轻从雷达系统对蜂窝系统的干扰。结果表明，IBFD CBRS网络架构不仅提高了PAL和GAA用户的性能，而且比最先进的半双工解决方案对雷达产生更少的干扰。最后，我们提出了一些开放的研究挑战，以激励对超越5G IBFD DSS网络的研究。
Dynamic spectrum sharing (DSS) has recently attracted keen interest from regulatory bodies around the world as a key strategy to overcome spectrum scarcity in beyond 5G networks. In the United States, the Federal Communications Commission has adopted a three-tier DSS model for the Citizens Broadband Radio Service (CBRS) band managed by a spectrum access system (SAS) to share incumbents' spectrum with commercial cellular broadband applications. In this article, we first present a survey of current DSS approaches and their limitations and then discuss the benefits of using in-band full-duplex (IBFD) techniques in DSS networks. To illustrate the improvement in the performance of priority access license (PAL) and general authorized access (GAA) users in an IBFD-assisted CBRS, we consider a CBRS mobile broadband network (MBN) architecture comprising an incumbent in the form of a MIMO radar system and an IBFD MIMO MBN, consisting of PAL and GAA users. In particular, we design joint beamformers at the MBN, with constraints on transmit power at the MBN and detection probability of the radar system, and beamformers at the radar system to mitigate the interference from the radar system toward the cellular system. It is shown that the IBFD CBRS network architecture not only leads to improved performance of PAL and GAA users, but does so while producing less interference toward the radar than state-of-the-art half-duplex solutions. Finally, we present some open research challenges to invigorate research on beyond 5G IBFD DSS networks.