Abstract This paper discusses two recent spectrum management frameworks, the Licensed Shared Access (LSA) developed in Europe and the Citizens Broadband Radio Services (CBRS) developed in the United States (US), which build their management approach on spectrum sharing. The importance of these two frameworks, besides their leading normative roles, is that recent debates have shaped them as cases to consider in the adoption of the upcoming fifth generation (5G) of mobile communications technology, in particular in the C-band. A discussion on these two frameworks is organised by following the four-step decision-making guide for spectrum management developed by Pogorel (2007), which requires spectrum authorities to make decisions in four areas of spectrum management: frequency harmonization, technology standardization, type of usage rights and assignment procedures. Notwithstanding the similarities with respect to the four areas of spectrum management considered, the two frameworks differ on their implementation schedules. CBRS leads the way, with a handful of providers receiving government approval to manage spectrum access controllers, and as of mid 2020, scheduled to have allocated spectrum licenses on half of its available spectrum. On the contrary, European countries have shown scarce interest towards implementing the LSA, despite the extensive work carried out by regulatory and standardization bodies. This may suggest that there are external contextual factors which influence the successful implementation of spectrum sharing frameworks. An interesting aspect which deserves further investigation is the institutional context in which decisions related to radio spectrum management are taken. Unlike the US authorities, European institutions do not possess coercive enforcement powers with respect to spectrum sharing. This key difference may contribute to explaining the different speed at which LSA and CBRS are implemented.

中文翻译：

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5G 会带来更多频谱共享吗？讨论 LSA 和 CBRS 频谱共享框架的最新发展

摘要 本文讨论了两个最近的频谱管理框架，即欧洲开发的许可共享接入 (LSA) 和美国 (US) 开发的公民宽带无线电服务 (CBRS)，它们构建了频谱共享的管理方法。这两个框架的重要性，除了其领先的规范作用外，还在于最近的辩论将它们塑造为采用即将到来的第五代 (5G) 移动通信技术（尤其是在 C 频段）时需要考虑的案例。按照 Pogorel (2007) 制定的频谱管理四步决策指南组织了对这两个框架的讨论，该指南要求频谱主管部门在频谱管理的四个领域做出决策：频率协调、技术标准化、使用权的类型和分配程序。尽管所考虑的频谱管理的四个领域有相似之处，但这两个框架的实施时间表不同。CBRS 处于领先地位，少数提供商获得政府批准管理频谱接入控制器，并计划在 2020 年中期为其一半可用频谱分配频谱许可证。相反，尽管监管和标准化机构开展了大量工作，但欧洲国家对实施 LSA 几乎没有兴趣。这可能表明存在影响频谱共享框架成功实施的外部背景因素。值得进一步研究的一个有趣方面是做出与无线电频谱管理相关的决策的制度背景。与美国当局不同，欧洲机构在频谱共享方面不拥有强制执行权。这一关键差异可能有助于解释 LSA 和 CBRS 实施的不同速度。