The next generation of mobile-enabled wireless networks, known as 5G networks, is announced to be deployed by 2020. In the 5G framework, access technologies are one of the main features that would allow users to seamlessly connect to the Internet using any of the available technologies. These technologies are going to coexist in the same physical environment. This coexistence has the advantage of offering the user multiple options for establishing communications. On the other hand, existing and upcoming wireless standards have not given this coexistence enough attention. In this paper, we survey existing communication protocols, techniques and mechanisms, as well as features of the 5G communication standards that allow technology to cope well with coexistence. We focus on access layer solutions that can be used in unlicensed frequency bands. We also argue that resource sharing should be extended not only to manage the available spectrum but also the available physical systems. We argue in this paper that resource sharing mechanisms would have a positive impact on the 5G infrastructure for better spectrum efficiency.

下一代移动无线网络（称为5G网络）宣布将于2020年部署。在5G框架中，访问技术是主要功能之一，它将使用户能够使用以下任何一种无缝连接到Internet。现有技术。这些技术将在相同的物理环境中共存。这种共存的优点是为用户提供了用于建立通信的多个选项。另一方面，现有和即将到来的无线标准并未给予这种共存足够的重视。在本文中，我们调查了现有的通信协议，技术和机制以及5G通信标准的特性，这些特性使技术能够很好地应对共存。我们专注于可在非授权频段中使用的接入层解决方案。我们还认为，资源共享不仅应扩展到管理可用频谱，还应扩展到可用物理系统。我们在本文中认为，资源共享机制将对5G基础设施产生积极影响，以提高频谱效率。