In this work, we consider a multi-operator mmWave network implementing secondary license sharing (SLS) where a primary license holder leases secondary licenses to secondary users, allowing them to access its licensed spectrum under some pre-defined transmission constraints. The highly directional nature of mmWaves, along with their sensitivity to blockages, naturally confines the interference to/from devices to narrow angular sectors within a certain range around themselves. This motivates us to consider a spatially-aware SLS that determines a secondary link's activity based on its distance/orientation relative to the primary link, as well as blockages around it. By leveraging the tools of stochastic geometry, we develop an analytical framework to design and study such spatially-aware SLS in mmWave networks. Our analysis quantifies the transmission opportunities available to secondary users and the resulting coverage probabilities for both primary and secondary links. We characterize the effect of directionality and blockage conditions, along with transmission restrictions and secondary users' density, on the performance of both operators. Via numerical investigation, we derive various insights. We show that blockage conditions can change the shape of coverage plots and thus affect key conclusions. Further, blockage and directionality can increase the transmission opportunities for secondary users, improving the feasibility and gains of SLS.

翻译：本文研究了一种采用次级许可共享（SLS）的多运营商毫米波网络，其中主许可持有者向次级用户租赁次级许可，允许其在预设传输约束下接入其授权频谱。毫米波的高度定向特性及其对障碍物的敏感性，自然地将设备间干扰限制在自身周围一定范围内的狭窄角度扇区内。这促使我们考虑一种空间感知的SLS机制，该机制根据次级链路相对于主链路的距离/方向以及周围障碍物情况来决定其活动状态。借助随机几何工具，我们建立了一个分析框架来设计和研究毫米波网络中此类空间感知的SLS。我们的分析量化了次级用户可用的传输机会以及主次链路的覆盖概率。我们刻画了方向性、障碍物条件、传输限制以及次级用户密度对双方运营商性能的影响。通过数值研究，我们得出多项重要结论：障碍物条件可能改变覆盖曲线的形态，从而影响关键结论；此外，障碍物与方向性可增加次级用户的传输机会，提升SLS的可行性与增益。